Dokument-ID Dokumenttyp Autoren/innen Persönliche Herausgeber/innen Haupttitel Abstract Auflage Verlagsort Verlag Herausgeber (Institution) Erscheinungsjahr Titel des übergeordneten Werkes Jahrgang/Band ISBN Veranstaltung Veranstaltungsort Beginndatum der Veranstaltung Enddatum der Veranstaltung Ausgabe/Heft Erste Seite Letzte Seite URN DOI Lizenz Datum der Freischaltung OPUS4-173 Forschungsbericht Streicher, Doreen; Algernon, Daniel; Behrens, Matthias; Kohl, Christoph; Wöstmann, Jens; Wiggenhauser, Herbert; Petz, J. Großflächige ZfPBau-Untersuchungen an Hohlkastenbrücken der A 23 - Südosttangente Wien Mit Radar, Impact-Echo und Ultraschallecho wurden 2004/2005 zwei Spannbetonbrücken der stark befahrenen A 23 Südosttangente in Wien zerstörungsfrei untersucht. Bei den Bauwerken handelt es sich um Hohlkastenbrücken, die 1975/76 unter Verwendung unterschiedlicher Spannsysteme errichtet wurden. Durch Messungen mit den zerstörungsfreien Prüfverfahren an den Außenseiten zweier Hohlkastenstege wurde sowohl die schlaffe Bewehrung als auch Längsspannglieder in den Stegen geortet. Darüber hinaus sollte der Verpresszustand der Spannglieder mit Hilfe der akustischen Verfahren Impact-Echo und Ultraschallecho ermittelt werden. Bremerhaven Wirtschaftsverlag NW Bundesanstalt für Materialforschung und -prüfung (BAM) 2006 278 978-3-86509-529-1 1 46 urn:nbn:de:kobv:b43-1735 http://www.gesetze-im-internet.de/urhg/index.html 2015-01-23 OPUS4-250 Forschungsbericht Arndt, Detlef; Borchardt, Kerstin; Croy, F.; Geyer, Emil; Henschen, Joachim; Maierhofer, Christiane; Niedack, Marianne; Rudolphi, Michael; Schaurich, Dieter; Weise, Frank; Wiggenhauser, Herbert Anwendung u. Kombination zerstörungsfreier Prüfverfahren zur Bestimmung der Mauerwerksfeuchte im Deutschen Dom Am Deutschen Dom wurden Mikrowellenabsorptionsmessungen, Radar und Infarot- Thermographie als moderne zerstörungsfreie Prüfverfahren der Feuchtemessung in Mauerwerk erprobt. Ergänzende numerische Simulationsrechnungen des gekoppelten Wärme- und Feuchtetransports sollen bei der Auswahl von Trockenlegungskonzepten helfen. Bremerhaven Wirtschaftsverlag NW Bundesanstalt für Materialforschung und -prüfung (BAM) 1994 200 978-3-89429-423-X 1 84 urn:nbn:de:kobv:b43-2509 http://www.gesetze-im-internet.de/urhg/index.html 2015-06-17 OPUS4-273 Forschungsbericht Schickert, Gerald; Krause, Martin; Wiggenhauser, Herbert Studie zur Anwendung zerstörungsfreier Prüfverfahren bei Ingenieurbauwerken - ZfPBau-Kompendium Dieses Kompendium enthält in Form einer jederzeit ergänzbaren Loseblattsammlung folgende Abschnitte: Vorwort, Hinweise zur Benutzung, Verzeichnis und Klassifizierung der Geräte und Verfahren, Geräte und Verfahren, Verzeichnis von Lieferanten und Herstellern, Literaturverzeichnis, Index. Bremerhaven Wirtschaftsverlag NW Bundesanstalt für Materialforschung und -prüfung (BAM) 1991 177 1 235 urn:nbn:de:kobv:b43-2735 http://www.gesetze-im-internet.de/urhg/index.html 2015-06-02 OPUS4-593 Beitrag zu einem Sammelband Krause, Martin; Bärmann, R.; Frielinghaus, R.; Kreschmar, F.; Krogge, O.; Langenberg, K.; Maierhofer, Christiane; Müller, W.; Neisecke, J.; Schickert, M.; Schmitz, V.; Wiggenhauser, Herbert; Wollbold, F. Schickert, G. Comparison of pulse-echo-methods for testing concrete Berlin DGZfP, Dt. Ges. für Zerstörungsfreie Prüfung e.V. Bundesanstalt für Materialforschung und -prüfung 1995 Proceedings - International Symposium Non-Destructive Testing in Civil Engineering (NDT-CE) 3-931381-02-1 International Symposium Non-Destructive Testing in Civil Engineering (NDT-CE) Berlin, Germany 1995-09-26 1995-09-28 281 295 2016-02-19 OPUS4-1759 Zeitschriftenartikel Maierhofer, Christiane; Brink, Arne; Röllig, Mathias; Wiggenhauser, Herbert Transient thermography for structural investigation of concrete and composites in the near surface region Oxford Pergamon Press 2002 Infrared physics & technology 43 271 278 2016-02-19 OPUS4-2214 Beitrag zu einem Sammelband Lausch, Regine; Wiggenhauser, Herbert; Schubert, F. Geometrieeffekte und Hüllrohrortung bei der Impaktecho-Prüfung von Betonbauteilen - Experimentelle und modelltheoretische Ergebnisse Zusammenfassung Bei der Errichtung von Spannbetonbauwerken und der Verwendung immer leistungsfähigerer Betone werden die Anforderungen an eine hochwertige und fehlerlose Bauausführung stetig höher. Zur Vermeidung von Baumängeln und damit zur Sicherung der Tragfähigkeit, sowie zur Erhöhung der Lebensdauer eines Bauwerks ist eine Qualitätsüberwachung bzw. - kontrolle notwendig. Die Hüllrohrortung und die Bestimmung des Verpresszustandes ist demzufolge eine Aufgabe, der im Bauwesen eine wachsende Bedeutung zukommt. An einem Betonprobekörper mit drei Hüllrohren mit unterschiedlichen Verpresszuständen wurden Messungen durchgeführt, mit dem Ziel, diese zu orten und Aussagen über den Verfüllzustand zu machen. Die Position der Hüllrohre im Betonprobekörper konnte eindeutig bestimmt werden. Es war nicht möglich, die Tiefenlage zu ermitteln. Nach der Einbringung und Verpressung eines Stabstahles in eines der Hüllrohre waren signifikante Veränderungen im Impaktechogramm zu erkennen, so dass die beiden Verfüllzustande voneinander zu unterscheiden waren. Gerade bei begrenzter Probekörpergeometrie ist zu beobachten, dass die Impaktechogramme mit regelmäßigen Mustern überlagert werden (Geometrieeffekte). Diese werden hauptsächlich durch die an den seitlichen Bauteilbegrenzungen reflektierten Wellenanteile ausgelöst, erkennbar in den EFIT-Simulationen, welche qualitativ sehr gut mit den experimentellen Befunden übereinstimmen. Berlin DGZfP Deutsche Gesellschaft für Zerstörungsfreie Prüfung 2002 ZfP in Anwendung, Entwicklung und Forschung - Jahrestagung 2002 3-931381-39-0 Jahrestagung Zerstörungsfreie Materialprüfung 2002 Weimar, Deutschland 2002-05-06 2002-05-08 80-CD 2016-02-19 OPUS4-2215 Beitrag zu einem Tagungsband Popovics, J. S.; Wiggenhauser, Herbert Smyth, A. W. Non-Contact Laser Vibrometer Wave Sensing on Concrete Rapid and accurate non-destructive evaluation (NDE) techniques are needed to assess the in-place condition of concrete structures. However the time and effort required to perform NDE tests using conventional surface-mounted contact sensors hinder rapid evaluation of full-scale structures. The authors are cooperating in research to develop rapid and robust methods that collect mechanical wave signals from concrete structures and to characterize defects in concrete using that signal data. The suitability of surface waves and laser-based, non-contact wave detection techniques for this purpose are examined here. After a brief introduction to non-contact sensing, an experimental set-up is described and results from experimental tests are presented. Mechanical surface waves in a concrete slab specimen are generated with several different conventional sources. The ability of a laser vibrometer to detect wave propagation from concrete that does not have any reflective treatment (normal concrete surface) is demonstrated, allowing the generation of ultrasonic images. Test results from a concrete specimen containing a subsurface defect are then presented. The obtained ultrasonic images illustrate some limitations of using surface waves to detect subsurface defects in concrete, although approaches to improve the results are proposed. American Society of Civil Engineers 2002 Proceedings of the 15th ASCE Engineering Mechanics Conference 15th ASCE Engineering Mechanics Conference ; 15th EM 2002 New York, NY, USA 2002-06-02 2002-06-05 1(?) 7(?) 2016-02-19 OPUS4-2216 Beitrag zu einem Sammelband Wilsch, Gerd; Schaurich, Dieter; Wöstmann, Jens; Wiggenhauser, Herbert Anwendungen der Laser Induced Breakdown Spectroscopy im Bauwesen Zusammenfassung Die Laser Induced Breakdown Spectroscopy (LIBS) ist eine analytische Methode mit der die Elementverteilung auf der Oberfläche von Proben orts- und tiefenaufgelöst ermittelt werden kann. Ein intensiver, infraroter Laserstrahl wird auf die Oberfläche fokussiert. Durch die hohe Energiedichte werden einige Mikrogramm Material verdampft und ein Plasma gebildet. Bei der Ausdehnung und Abkühlung des Plasmas wird die charakteristische Fluoreszenz der verdampften Elemente abgestrahlt und mit spektroskopischen Mitteln analysiert. Die Empfindlichkeit der Methode liegt im ppm-Bereich, die typische Messgenauigkeit beträgt einige Prozent. Die Ergebnisse liegen quasi on-line vor, es ist keine Probenpräparation notwendig und die Apparatur ist vor Ort einsetzbar. Im Artikel werden Anwendungen der LIBS zur Untersuchung von Baustoffen beschrieben. Die Ergebnisse der Ermittlung der Salzverteilung in Baustoffen, der Untersuchung der Betonzusammensetzung und dem Nachweis von hydrophobierten Schichten auf unterschiedlichen Baustoffen werden vorgestellt. Berlin DGZfP Deutsche Gesellschaft für Zerstörungsfreie Prüfung 2002 ZfP in Anwendung, Entwicklung und Forschung - Jahrestagung 2002 3-931381-39-0 Jahrestagung Zerstörungsfreie Materialprüfung 2002 Weimar, Deutschland 2002-05-06 2002-05-08 80-CD 2016-02-19 OPUS4-2217 Forschungsbericht Krause, Martin; Wiggenhauser, Herbert; Krieger, J. Materialtechnische Untersuchung beim Abbruch der Talbrücke Haiger - Durchführung von Ultraschall- und Impakt-Echo-Messungen Bremerhaven Wirtschaftsverl. NW Bundesanstalt für Straßenwesen 2002 Berichte der Bundesanstalt für Straßenwesen, Reihe B (Brücken- und Ingenieurbau) 38 1 111 2016-02-19 OPUS4-3367 Beitrag zu einem Tagungsband Wilsch, Gerd; Weritz, Friederike; Schaurich, Dieter; Wiggenhauser, Herbert Forde, M. C. Determination of chloride content in concrete structures with laser-induced breakdown spectroscopy Edinburgh Engineering Technics Press University, Edinburgh 2003 Structural faults & repair 2003 (Proceedings) 0-947644-53-9 10th Structural Faults + Repair Conference London, England, UK 2003-07-01 2003-07-03 2016-02-19 OPUS4-3368 Beitrag zu einem Sammelband Wilsch, Gerd; Schaurich, Dieter; Weritz, Friederike; Wiggenhauser, Herbert Laser-induced breakdown spectroscopy for on-site determination of chloride in concrete The Chloride content is an important factor which influences the durability of concrete structures. The standard methods are mostly intricate, time consuming and require a chemical laboratory. This article describes the application of a spectroscopic method, the laser-induced breakdown spectroscopy (LIBS), for the determination of Chloride contents in concrete and mortar specimens. LIBS can be used on-site, needs no sample preparation and is able to investigate rapidly a large number of different measuring points. The LIBS set-up and the experimental conditions to detect Chlorides are reported. Calibration curves are presented and the limit of detection (LOD) is determined. Results measured on different concrete cores are presented and compared with the results of standard chemical methods. Berlin DGZfP Deutsche Gesellschaft für Zerstörungsfreie Prüfung 2003 International Symposium Non-Destructive Testing in Civil Engineering (NDT-CE) 3-931381-49-8 6th International Symposium Non-Destructive Testing in Civil Engineering (NDT-CE) Berlin, Germany 2003-09-16 2003-09-19 1(?) 11(?) 2016-02-19 OPUS4-3369 Beitrag zu einem Sammelband Weritz, Friederike; Wilsch, Gerd; Schaurich, Dieter; Wiggenhauser, Herbert Laser Induced Breakdown Spectroscopy as a tool for the characterization and sorting of concrete waste material in view of high-order re-use The high amount of building waste material requires innovative strategies for high-order re-use of the material. With Laser Induced Breakdown Spectroscopy (LIBS) both the elemental composition of building materials and trace elements can be determined with a real-time measurement, even on-site and in a harsh industrial environment. We present the experimental data on heavy metal detection in the ppm concentration range, as well as calibration curves. Further on we demonstrate the characterization of cement and concrete concerning the main components by means of Rankin diagrams. We suggest an implementation of LIBS in the processing of building waste materials to allow a high-order re-use. Berlin DGZfP Deutsche Gesellschaft für Zerstörungsfreie Prüfung 2003 International Symposium Non-Destructive Testing in Civil Engineering (NDT-CE) 3-931381-49-8 6th International Symposium Non-Destructive Testing in Civil Engineering (NDT-CE) Berlin, Germany 2003-09-16 2003-09-19 1(?) 7(?) 2016-02-19 OPUS4-3403 Beitrag zu einem Sammelband Brink, Arne; Wedler, Gerd; Maierhofer, Christiane; Röllig, Mathias; Weritz, Friederike; Wiggenhauser, Herbert Active infrared thermography in civil engineering - quantitative analysis by numerical simulation The cooling-down process of building structures after heating-up with an external radiation source was analysed to detect voids inside and below the surface. Quantitative results of concrete test specimen containing voids with different sizes at various depths will be presented here. The experimental results were compared to numerical simulations performed with a Finite Difference program developed at BAM. Berlin DGZfP Deutsche Gesellschaft für Zerstörungsfreie Prüfung 2003 International Symposium Non-Destructive Testing in Civil Engineering (NDT-CE) 3-931381-49-8 6th International Symposium Non-Destructive Testing in Civil Engineering (NDT-CE) Berlin, Germany 2003-09-16 2003-09-19 1 8(?) 2016-02-19 OPUS4-829 Beitrag zu einem Sammelband Wiggenhauser, Herbert; Krause, Martin; Krieger, J. Medlock, R. Tests and assessments of NDT methods for concrete bridges A research project is described involving a comparison of different non-destructive test methods for concrete bridges. A cooperative test series was started with the aim to compare and evaluate the performance and benefits of the latest technical developments in this field. For this purpose test specimens with localized defects were produced. Different modifications of radar, ultrasonic-echo and impact-echo methods were investigated. Including two- and three- dimensional reconstruction models. The experiments were accompanied by numerical simulation of the propagation of sound waves and microwaves. The results showed that the radar and the ultrasonic methods were efficient tools to locate the tendon ducts accurately if the reinforcing bars were not to narrowly spaced. The ultrasonic imaging methods were capable of identifying injection and compaction faults in a blind test. The good performance of the impact-echo method with regard to locating tendon ducts which was claimed in several publications could not be validated in the present investigations. The simulation models provided valuable information on how to improve the experimental test program and its evaluation. Bellingham, Wash. SPIE 1999 Structural materials technology III 3400 0-8194-2849-3 Structural materials technology III San Antonio, TX, USA 1998-03-31 1998-04-03 258 269 10.1117/12.300098 2016-02-19 OPUS4-1497 misc Taffe, Alexander; Maierhofer, Christiane; Krause, Martin; Gardei, André; Niederleithinger, Ernst; Hasenstab, Andreas; Hemmleb, Matthias; Wiggenhauser, Herbert; Borchardt, Kerstin ZfPBau-Kompendium 2004 Dieses Kompendium ist ein kurzgefasster Abriss, ein Leitfaden und auch ein Handbuch der für den Einsatz im Bauwesen geeigneten zerstörungsfreien Prüfverfahren. In strenger, stets gleicher Gliederung wird jede der mehr als 100 Untersuchungsmethoden in einem eigenen Geräteblatt beschrieben. Hinzu kommen Querverweise zu alternativen Prüfmethoden sowie zahlreiche Hinweise auf einschlägige Fachliteratur und zu bekannt gewordenen Geräteherstellern, Lieferanten und Dienstleistern. Berlin Bundesanstalt für Materialforschung und -prüfung 2007 2016-02-19 OPUS4-1859 Beitrag zu einem Sammelband Mielentz, Frank; Krause, Martin; Wüstenberg, Hermann; Wiggenhauser, Herbert Green, R. E.; Djordjevic, B. B.; Hentschel, M. P. Development of a phased array transmitting equipment for ultrasonic testing of concrete Berlin Springer Bundesanstalt für Materialforschung und -prüfung 2002 Nondestructive characterization of materials XI 3-540-40154-7 11th International Symposium on Nondestructive Characterization of Materials Berlin, Germany 2002-06-24 2002-06-28 605 613 2016-02-19 OPUS4-1822 Beitrag zu einem Sammelband Brink, Arne; Maierhofer, Christiane; Röllig, Mathias; Wiggenhauser, Herbert Balageas, D. Application of quantitative impulse thermography for structural evaluation in civil engineering - comparison of experimental results and numerical simulations Zagreb FSB Sveuciliste, Zagreb / Fakultet Strojarstva i Brodogradnje 2002 Quantitative infraRed thermography 6 953-631350-2 6th International Conference on Quantitative InfraRed Thermography ; 6th QIRT '02 Dubrovnik, Croatia 2002-09-24 2002-09-27 35 40 2016-02-19 OPUS4-1824 Beitrag zu einem Sammelband Maierhofer, Christiane; Brink, Arne; Röllig, Mathias; Wiggenhauser, Herbert Anwendung der Impuls-Thermografie als quantitatives zerstörungsfreies Prüfverfahren im Bauwesen Zusammenfassung Die Impuls-Thermografie ist eine aktive Methode zur Strukturuntersuchung von Bauteilen. Im Rahmen eines von der DFG geförderten Projektes wird in Kooperation mit der TU Berlin an der Bundesanstalt für Materialforschung und -prüfung zur Zeit die mögliche Anwendung der Impuls-Thermografie als zerstörungsfreies Prüfverfahren im Bauwesen untersucht. Die Impuls-Thermografie soll zur Ortung von oberflächennahen Inhomogenitäten, bei denen es sich im Normalfall um Fehlstellen handelt, in typischen Bauteilen verwendet werden und nach Möglichkeit die Geometrie- sowie die Materialparameter der Inhomogenitäten quantitativ bestimmt werden. Messungen werden derart durchgeführt, dass Oberflächen mit einem geeigneten Heizstrahler erwärmt, die anschließenden Abkühlungsprozesse mit einer Infrarot-Kamera betrachtet und thermische Bilddaten (Thermogramme) aufgezeichnet werden. Der Hauptansatzpunkt für die quantitative Auswertung der Messdaten ist die Betrachtung von Temperatur-Zeit-Kurven (Transienten) des Abkühlungsprozesses über fehlerfreien und fehlerhaften Bereichen des Probekörpers. Zusätzlich werden auf Basis der Finiten-Differenzen-Methode numerische Simulationen durchgeführt. Quantitative Ergebnisse werden sowohl durch den Vergleich der experimentellen Daten mit den Simulationsrechnungen als auch durch eine Anpassung analytischer Funktionen an die Transienten erzielt. Berlin DGZfP Deutsche Gesellschaft für Zerstörungsfreie Prüfung 2002 ZfP in Anwendung, Entwicklung und Forschung - Jahrestagung 2002 3-931381-39-0 Jahrestagung Zerstörungsfreie Materialprüfung 2002 Weimar, Deutschland 2002-05-06 2002-05-08 80-CD 2016-02-19 OPUS4-1827 Beitrag zu einem Tagungsband Maierhofer, Christiane; Brink, Arne; Röllig, Mathias; Wiggenhauser, Herbert; Hillemeier, B.; Rieck, C. Kupfer, K.; Trinks, E. Untersuchung des Einflusses von Feuchtigkeit auf die Ortung von Hohlstellen in Betonstrukturen mit der Impuls-Thermografie Weimar MFPA an der Bauhaus-Univ. Materialforschungs- und -prüfanstalt, Weimar 2002 Feuchtemessung - ein vielfältiges Problem mit großen Perspektiven 11. Feuchtetag Weimar, Deutschland 2002-09-18 2002-09-19 47 58 2016-02-19 OPUS4-1828 Beitrag zu einem Tagungsband Maierhofer, Christiane; Brink, Arne; Röllig, Mathias; Wiggenhauser, Herbert Impulse Thermography for locating voids and honeycombing in concrete structures supported by numerical simulations Dresden TU Institut für Bauklimatik, Dresden 2002 Tagungsbeiträge des 11. Bauklimatisches Symposiums 11. Bauklimatisches Symposium ; 11th Symposium of Building Physics Dresden, Germany 2002-09-26 2002-09-30 242 252 2016-02-19 OPUS4-1829 Beitrag zu einem Sammelband Maierhofer, Christiane; Brink, Arne; Röllig, Mathias; Wiggenhauser, Herbert Binda, L. Transient thermography for non-destructive investigation of building structures in the near surface region Bagneux, France RILEM Publications International Union of Testing and Research Laboratories for Materials and Structures / Technical Committee Masonry Durability and On-Site Testing 2003 On-site control and evaluation of masonry structures 2-912143-34-9 RILEM TC 177-MDT Workshop on On-Site Control and Non-Destructive Evaluation of Masonry Structures Mantova, Italy 2001-11-12 2001-11-14 26 251 261 2016-02-19 OPUS4-3158 Beitrag zu einem Sammelband Maierhofer, Christiane; Arndt, Ralf; Röllig, Mathias; Weritz, Friederike; Wiggenhauser, Herbert Untersuchung von Betonstrukturen mit der Puls-Phasen-Thermografie Berlin DGZfP 2003 Thermografie-Kolloquium 2003 3-931381-51-X Thermografie-Kolloquium 2003 Stuttgart, Deutschland 2003-09-25 86-CD 53 62 2016-02-19 OPUS4-3160 Beitrag zu einem Sammelband Maierhofer, Christiane; Krause, Martin; Niederleithinger, Ernst; Wiggenhauser, Herbert Non-destructive testing methods at BAM for damage assessment and quality assurance in civil engineering The structural safety, durability and performance of the infrastructure is of primary interest in every country. An efficient system for early and regular structural assessment as well as for quality assurance during and after the construction of new structures and of reconstruction processes is urgently required. At BAM, NDT methods to be applied in civil engineering are developed and their application improved. From the experience of on-site assessments, quality assurance systems and methodologies for regular inspections are elaborated. This work is mainly performed in the frame of externally funded research projects. Berlin DGZfP Deutsche Gesellschaft für Zerstörungsfreie Prüfung 2003 International Symposium Non-Destructive Testing in Civil Engineering (NDT-CE) 3-931381-49-8 6th International Symposium Non-Destructive Testing in Civil Engineering (NDT-CE) Berlin, Germany 2003-09-16 2003-09-19 2016-02-19 OPUS4-3162 Zeitschriftenartikel Maierhofer, Christiane; Brink, Arne; Röllig, Mathias; Wiggenhauser, Herbert Quantitative Impulse-Thermography as Non-Destructive Testing Method in Civil Engineering - Experimental Results and Numerical Simulations Impulse-thermography is an active method for quantitative investigation of the near surface region of various structures which has recently been applied to civil engineering. It is well suited for the detection of voids and honeycombing in concrete up to concrete covers of 10 cm and more. For quantitative analysis, a computer program for numerical simulation of the heating up and cooling down processes was developed based on Finite Differences. With this program parameter studies have been performed for investigating the influence of environmental conditions, material parameters and geometry on the thermal behaviour. The comparison between experimental and simulated results enables the Inverse Solution. Oxford Elsevier 2005 Construction & building materials 19 10 731 737 2016-02-19 OPUS4-3164 Zeitschriftenartikel Maierhofer, Christiane; Brink, Arne; Röllig, Mathias; Wiggenhauser, Herbert; Hillemeier, B.; Rieck, C. Struktur- und Feuchteuntersuchung in Betonstrukturen mit der Impuls-Thermografie Berlin Ernst 2003 Bauphysik 25 1 22 26 2016-02-19 OPUS4-3897 Vortrag Wiggenhauser, Herbert NDT of Concrete Structures 2002 Workshop on NDE of concrete structures 2002 Workshop on NDE of concrete structures 2002 Chennai, India 2002-12-02 2002-12-04 2016-02-19 OPUS4-3873 Vortrag Wiggenhauser, Herbert Non-Destructive Testing of Historical Structures 2002 Ariadne Workshop 2002 Ariadne Workshop 2002 Prague, Czech Republic 2002-05-22 2016-02-19 OPUS4-3874 Vortrag Wiggenhauser, Herbert Non-Destructive Testing of Monuments 2002 Indo-German Workshop, Earthquakes Indo-German Workshop, Earthquakes Karlsruhe, Germany 2002-06-25 2002-06-27 2016-02-19 OPUS4-3875 Vortrag Wiggenhauser, Herbert Objektbezogene Schadensanalyse-Verfahren 2002 Lehrgang für Bauwerksprüfingenieure an der BASt Lehrgang für Bauwerksprüfingenieure an der BASt Bergisch Gladbach, Germany 2002-10-24 2016-02-19 OPUS4-3876 Vortrag Wiggenhauser, Herbert Planung und Herstellung des großen Betonprobekörpers (GBP) zur Ertüchtigung von zerstörungsfreien Prüfverfahren 2002 Forschergruppe 384, 2. Workshop-Klausursitzung, MFPA Weimar Forschergruppe 384, 2. Workshop-Klausursitzung, MFPA Weimar Weimar, Germany 2002-09-17 2016-02-19 OPUS4-3879 Vortrag Wiggenhauser, Herbert Zerstörungsfreie Prüfung im Bauwesen 2002 Vorlesung an der Technischen Universität Berlin Vorlesung an der Technischen Universität Berlin Berlin, Germany 2002-07-01 2016-02-19 OPUS4-3880 Vortrag Wiggenhauser, Herbert Zerstörungsfreie Bauwerksuntersuchungen mit Radar 2002 2. Symposium Experimentelle Untersuchungen von Baukonstruktionen 2. Symposium Experimentelle Untersuchungen von Baukonstruktionen Dresden, Germany 2002-09-26 2016-02-19 OPUS4-3869 Vortrag Wiggenhauser, Herbert Geometrieeffekte bei der Hüllrohrortung mit Impact-Echo 2002 Forschergruppe 384, 2. Workshop - Klausursitzung, MFPA Weimar Forschergruppe 384, 2. Workshop - Klausursitzung, MFPA Weimar Weimar, Germany 2002-09-17 2016-02-19 OPUS4-3870 Vortrag Wiggenhauser, Herbert Impact-Echo and Ultrasonic Testing of Concrete 2002 Training Courses: Investigation and Monitoring of Dams and Hydroelectric Basins in Georgia Training Courses: Investigation and Monitoring of Dams and Hydroelectric Basins in Georgia Trieste, Italy 2002-08-27 2016-02-19 OPUS4-3872 Vortrag Wiggenhauser, Herbert NDT-CE in Civil Engineering 2002 Training Courses: Investigation and Monitoring of Dams and Hydroelectric Basins in Georgia Training Courses: Investigation and Monitoring of Dams and Hydroelectric Basins in Georgia Trieste, Italy 2002-08-26 2016-02-19 OPUS4-1641 Beitrag zu einem Tagungsband Wiggenhauser, Herbert; Maierhofer, Christiane Zerstörungsfreie Bauwerksuntersuchungen mit Radar Dresden Inst. für Tragwerke und Baustoffe 2002 2. Symposium Experimentelle Untersuchungen von Baukonstruktionen (Schriftenreihe des Instituts für Tragwerke und Baustoffe H. 17) 2. Symposium Experimentelle Untersuchungen von Baukonstruktionen ; 2. Ehrenkolloquium Prof. Dr.-Ing. habil. Heinz Opitz Dresden, Deutschland 2002-09-26 17 71 78 2016-02-19 OPUS4-1978 Beitrag zu einem Sammelband Krause, Martin; Wiggenhauser, Herbert; Krieger, J. NDE of a Post Tensioned Concrete Bridge Girder Using Ultrasonic Pulse Echo and Impact Echo Columbus, Ohio American Society for Nondestructive Testing New York, State / Department of Transportation 2002 Structural materials technology V 5 1-571-17094-4 5th Structural Materials Technology NDT Conference Cincinnati, OH, USA 2002-09-10 2002-09-13 386 395 2016-02-19 OPUS4-3053 Beitrag zu einem Sammelband Kohl, Christoph; Krause, Martin; Maierhofer, Christiane; Mayer, K.; Wöstmann, Jens; Wiggenhauser, Herbert 3D-Visualisation of NDT-Data using Data Fusion Technique Non-destructive testing (NDT) of concrete structures is performed using pulse-echo methods. According to the type of the applied waves it can be classified as acoustic (Impact-Echo, Ultrasonics) and electromagnetic methods (Radar). The results are visualised through different imaging processes. This work is performed in the frame of a research project promoted by Deutsche Forschungsgemeinschaft (FOR384).The objective of data fusion is to use the complementary information of the different methods. Radar can detect metallic reflectors in concrete (metallic ducts and concrete reinforcement) very well. This method is not able to locate defects behind these reflectors (injecting defects, defects behind close concrete reinforcement), because the electromagnetic waves are completely reflected at metals. The acoustic methods are able to compensate this deficit i.e. acoustic waves can penetrate through metal. But acoustic waves in the ultrasonic range are completely reflected by air layers. Air layers have smaller influence on radar propagation, so that both methods complement each other.In order to be able to combine the NDT-data from several methods records at the same volume, the different data setsmodes of signals must be adapted. The ultrasonic and radar data have to be reconstructed with programs based on the Synthetic Aperture Focusing Technique (SAFT) before data fusion. Subsequently, a conversion of the data into a uniform format has to be carried out. This is a prerequisite in order to keep the data exchange between the project partners as simple as possible. After the data sets are imported and transferred into a common reference system, they can be processed with operations according to the purpose of the investigation. Results, which have been achieved in concrete test specimen with radar and ultrasonics, will be presented and will show the feasibility of the data fusion method. Berlin DGZfP Deutsche Gesellschaft für Zerstörungsfreie Prüfung 2003 International Symposium Non-Destructive Testing in Civil Engineering (NDT-CE) 3-931381-49-8 6th International Symposium Non-Destructive Testing in Civil Engineering (NDT-CE) Berlin, Germany 2003-09-16 2003-09-19 1 11(?) 2016-02-19 OPUS4-3054 Beitrag zu einem Sammelband Kohl, Christoph; Maierhofer, Christiane; Krause, Martin; Streicher, Doreen; Wiggenhauser, Herbert Mazal, P. Data fusion of complementary NDT methods applied in civil engineering Brno Univ. of Technology Czech Society for Non-Destructive Testing 2003 NDT in progress : IInd International Workshop of NDT Experts, October 06 - 08, 2003, Prague, Czech Republic, Proceedings 80-2142475-3 2nd International Workshop of NDT Experts Prague, Czech Republic 2003-10-06 2003-10-08 1 11(?) 2016-02-19 OPUS4-3862 Vortrag Wiggenhauser, Herbert Case Studies for NDT of Structures 2002 Training Courses: Investigation and Monitoring of Dams and Hydroelectric Basins in Georgia Training Courses: Investigation and Monitoring of Dams and Hydroelectric Basins in Georgia Trieste, Italy 2002-08-28 2016-02-19 OPUS4-1187 Beitrag zu einem Tagungsband Brink, Arne; Maierhofer, Christiane; Röllig, Mathias; Wiggenhauser, Herbert Anwendung der Impuls-Thermografie als zerstörungsfreies Prüfverfahren im Bauwesen Berlin DGZfP 2001 Fachtagung Bauwerksdiagnose 2001 - Praktische Anwendungen Zerstörungsfreier Prüfungen Fachtagung Bauwerksdiagnose - Praktische Anwendungen Zerstörungsfreier Prüfungen Leipzig, Deutschland 2001-10-25 2001-10-26 76-CD 2016-02-19 OPUS4-1189 Beitrag zu einem Tagungsband Wilsch, Gerd; Schaurich, Dieter; Wöstmann, Jens; Wiggenhauser, Herbert Nachweis von Hydrophobierungsmitteln mit Laser Induced Breakdown Spectroscopy Berlin DGZfP 2001 Fachtagung Bauwerksdiagnose 2001 - Praktische Anwendungen Zerstörungsfreier Prüfungen Fachtagung Bauwerksdiagnose - Praktische Anwendungen Zerstörungsfreier Prüfungen Leipzig, Germany 2001-10-25 2001-10-26 76-CD 2016-02-19 OPUS4-1201 Beitrag zu einem Tagungsband Mittag, Kornelia; Colla, Camilla; Krause, Martin; Maierhofer, Christiane; Mielentz, Frank; Milmann, Boris; Schneider, Gerhard; Wöstmann, Jens; Wiggenhauser, Herbert Zerstörungsfreie Messungen zur Beurteilung des inneren Zustandes fester Fahrbahnen der Deutschen Bahn AG: Vergleichsmessungen an Probeaufbauten im Labor Im Rahmen eines FE-Projektes "Inspektion Fester Fahrbahnen" der BAM und der Deutschen Bahn AG geht es um die Anwendung und weitere Entwicklung zerstörungsfreier Messverfahren zur Beurteilung des Zustandes Fester Fahrbahnen. Nach ersten Versuchsreihen direkt im Gleis wurden für verschiedene Bauarten die charakteristischen Herstellungsbedingungen simuliert und systematisch untersucht. Die kombinierte Anwendung der drei Messverfahren Ultraschall-Array-, Impakt-Echo- und Impuls-Radar-Verfahren wird hier an dem Beispiel "Betonschwelle in Betoneinbettung" dargestellt. Berlin Deutsche Gesellschaft für Zerstörungsfreie Prüfung (DGZfP) 2001 DGZfP-Berichtsband 76-CD Fachtagung Bauwerksdiagnose - Praktische Anwendungen Zerstörungsfreier Prüfungen Leipzig, Germany 25.10.2001 26.10.2001 1 8 2016-02-19 OPUS4-1211 Beitrag zu einem Tagungsband Brink, Arne; Maierhofer, Christiane; Röllig, Mathias; Wiggenhauser, Herbert Auswertungsmethoden der Impuls-Thermografie zur Ortung von Fehlstellen in Betonstrukturen Berlin DGZfP Deutsche Gesellschaft für zerstörungsfreie Prüfung 2001 Thermografie-Kolloquium 2001 Thermografie-Kolloquium 2001 Stuttgart, Deutschland 2001-09-22 77-CD 1 10(?) 2016-02-19 OPUS4-1177 Beitrag zu einem Tagungsband Wilsch, Gerd; Schaurich, Dieter; Wöstmann, Jens; Wiggenhauser, Herbert Forde, M. C. Application of laser induced breakdown spectroscopy for the detection of hydrophobic coatings Edinburgh Engineering Technics Press 2001 Proceedings of the 9th International Conference and Exhibition "Structural Faults and Repair" 9 9th International Conference and Exhibition "Structural Faults and Repair" London, England, UK 2001-07-04 2001-07-06 2016-02-19 OPUS4-1541 Beitrag zu einem Tagungsband Wiggenhauser, Herbert NDT of Concrete Structures 2002 Workshop on NDE of concrete structures Workshop on NDE of concrete structures Madras, India 2002-12-02 2002-12-04 1 19 2016-02-19 OPUS4-2071 Beitrag zu einem Sammelband Köhnen, Jörg; Weise, Frank; Wiggenhauser, Herbert A climbing robot for the assessment of civil infrastructures Zürich IABSE International Association for Bridge and Structural Engineering 2002 IABSE symposium Melbourne 2002 3-85748-107-2 IABSE symposium ; IABSE Symposium Towards a Better Built Environment - Innovation, Sustainability, Information Technology Melbourne, Australia 2002-09-11 2002-09-13 86 294 295 2016-02-19 OPUS4-2072 Beitrag zu einem Sammelband Köhnen, Jörg; Weise, Frank; Wiggenhauser, Herbert Casas, J. R. Development of an autonomous system for the condition assessment of bridges Barcelona International Center for Numerical Methods in Engineering (CIMNE) International Association for Bridge Maintenance, Safety and Management 2002 Bridge maintenance, safety and management : proceedings of the First International Conference on Bridge Maintenance, Safety and Management 84-95999-05-6 1st International Conference on Bridge Maintenance, Safety and Management ; 1st IABMAS '02 Barcelona, Spain 2002-07-14 2002-07-17 1 13 2016-02-19 OPUS4-2621 Beitrag zu einem Sammelband Krause, Martin; Maierhofer, Christiane; Gardei, André; Kohl, Christoph; Wiggenhauser, Herbert Naus, D. J. Improvement and combination of echo methods for NDT of concrete elements Bagneux RILEM Publications 2003 2nd International RILEM Workshop on Life Prediction and Aging Management of Concrete Structures (RILEM proceedings : PRO 29) 2-912143-36-5 2nd International RILEM Workshop on Life Prediction and Aging Management of Concrete Structures Paris, France 2003-05-05 2003-05-06 29 137 147 2016-02-19 OPUS4-3517 Beitrag zu einem Sammelband Taffe, Alexander; Borchardt, Kerstin; Wiggenhauser, Herbert Specimen for the improvement of NDT-methods - Design and construction of a large concrete slab for NDT methods at BAM The performance and reliability of NDT-CE methods must be assured to establish these methods for standard testing in construction and structure management. To develop and test NDT-methods as well as to investigate their reliability specimens with well-defined properties (defects and dimension) are needed. The design and construction of a large concrete specimen (40 m2) with various fixtures to simulate compaction faults, grouting faults and the variation of dimensions is described. Berlin DGZfP Deutsche Gesellschaft für Zerstörungsfreie Prüfung 2003 International Symposium Non-Destructive Testing in Civil Engineering (NDT-CE) 3-931381-49-8 6th International Symposium Non-Destructive Testing in Civil Engineering (NDT-CE) Berlin, Germany 2003-09-16 2003-09-19 1(?) 6(?) 2016-02-19 OPUS4-1082 Zeitschriftenartikel Krause, Martin; Mielentz, Frank; Milmann, Boris; Wiggenhauser, Herbert; Müller, W.; Schmitz, V. Ultrasonic imaging of concrete members using an array system Oxford Butterworth-Heinemann 2001 NDT & E international 34 403 408 2016-02-19 OPUS4-1395 Beitrag zu einem Sammelband Mittag, Kornelia; Gardei, André; Krause, Martin; Maierhofer, Christiane; Wiggenhauser, Herbert; Giertz, M. Verfahrensentwicklung zur Qualitätssicherung Fester Fahrbahnen mit zerstörungsfreien Prüfverfahren 2 Berlin IFV Bahntechnik Interdisziplinärer Forschungsverbund Bahntechnik 2002 Tagungsband des Symposiums Feste Fahrbahn 2002 3-9809335-3-9 Symposium Feste Fahrbahn Berlin, Deutschland 2002-06-12 2002-06-13 1(?) 10(?) 2016-02-19 OPUS4-1921 Beitrag zu einem Tagungsband Schmitz, V.; Müller, W.; Krause, Martin; Wiggenhauser, Herbert Improved Detection of Tendon Ducts and Defects in Concrete Structures Using Ultrasonic Imaging At the beginning of the 90s the general opinion was, that ultrasonic inspection methods using pulse-echo technique were not suitable for the inspection of concrete because of the inhomogeneity and the strong scattering behavior of the embedded aggregates. In the meantime the progress in the development of new equipment and inspection strategies in connection with ultrasonic imaging techniques turns the pulse-echo technique into a powerful tool to solve problems related to concrete materials. These imaging techniques - developed for the inspection of homogenous materials like steel of aluminum - could be adopted to the very low frequencies needed for concrete inspections. Issy-les-Moulineaux NEA Nuclear Energy Agency 2002 The Evaluation of Defects, Repair Criteria & Methods of Repair for Concrete Structures on Nuclear Power Plants 2 Workshop on the Evaluation of Defects, Repair Criteria & Methods of Repair for Concrete Structures on Nuclear Power Plants Berlin, Germany 2002-04-10 2002-04-11 125 132 2016-02-19 OPUS4-3975 Beitrag zu einem Sammelband Gardei, André; Mittag, Kornelia; Wiggenhauser, Herbert; Ripke, B.; Jovanovic, M. Inspection of Concrete-Embedded Tracks Process development for the quality assurance of concrete-embedded tracks using non-destructive testing methods In the framework of the feasibility study "Inspection of Concrete-Embedded Tracks" between BAM and Deutscher Bahn AG, application and further development of NDT- measurements for the constructional conditions of the concrete-embedded tracks are investigated. After first test series on the rail track [Ref 1] and in further laboratory investigations on test specimen [Ref 2], result of the three selected non-destructive methods impact- echo, ultrasonic-echo and impulse radar will be presented. Berlin DGZfP Deutsche Gesellschaft für Zerstörungsfreie Prüfung 2003 International Symposium Non-Destructive Testing in Civil Engineering (NDT-CE) 3-931381-49-8 6th International Symposium Non-Destructive Testing in Civil Engineering (NDT-CE) Berlin, Germany 2003-09-16 2003-09-19 2016-02-19 OPUS4-11076 Beitrag zu einem Tagungsband Streicher, Doreen; Wiggenhauser, Herbert Automatisierte Brückenuntersuchungen mit kombinierten Verfahren Berlin BAM 2005 Tagungsband der DAfStb-Fachtagung 2005 DAfStb-Fachtagung Berlin, Deutschland 2005-03-10 2005-03-11 A25 A30 2016-02-19 OPUS4-11077 Beitrag zu einem Tagungsband Streicher, Doreen; Kohl, Christoph; Wiggenhauser, Herbert Assessment of post tensioned concrete bridges applying automated non-destructive testing systems München University of the German Armed Forces 2005 Proceedings of the 1st Munich Bridge Assessment Conference (MBAC 2005) 1st Munich Bridge Assessment Conference (MBAC 2005) Munich, Germany 2005-06-20 2005-06-25 13 pages 2016-02-19 OPUS4-11078 Beitrag zu einem Sammelband Streicher, Doreen; Wiggenhauser, Herbert Automatisierte zerstörungsfreie Untersuchungen an Spannbetonbrücken Zusammenfassung: Die zerstörungsfreie Untersuchung von Spannbetonbauwerken mit Radar, Impact-Echo und Ultraschallecho konzentriert sich auf die Ortung von Bewehrung und, wegen der damit verbundenen Korrosionsgefahr, auf die Lokalisierung von Verpressfehlern in Spannkanälen. Für die automatisierte Untersuchung großer Flächen wurden in der BAM – Bundesanstalt für Materialforschung und –prüfung Scannersysteme entwickelt und an mehreren Brückenbauwerken erprobt. Die Messdaten der drei angewendeten Verfahren werden eingehend bearbeitet und miteinander kombiniert. Durch die Kombination der Verfahren kann sowohl die schlaffe Bewehrung als auch Spannbewehrung geortet und können Hinweise auf Verpressfehler gegeben werden. Dresden TU Dresden, Institut für Massivbau 2005 3. Symposium Experimentelle Untersuchungen von Baukonstruktionen 3-86005-476-7 3. Symposium Experimentelle Untersuchungen von Baukonstruktionen Dresden, Deutschland 2005-06-23 15 26 2016-02-19 OPUS4-12136 Vortrag Wiggenhauser, Herbert Assessment of post tensioned concrete bridges applying automated non-destructive testing systems 2006 Transportation Research Board (TRB) 85th Annual Meeting 2006 and TRB Workshop Assessment of existing PT Bridges at TRB 85th Annual Meeting Transportation Research Board (TRB) 85th Annual Meeting 2006 and TRB Workshop Assessment of existing PT Bridges at TRB 85th Annual Meeting Washington, D.C., USA 2006-01-22 2006-01-26 2016-02-19 OPUS4-12137 Vortrag Wiggenhauser, Herbert Reflection of acoustic waves at conrete/steel-interfaces 2006 Workshop AFF 40 (1) in the scope of Transportation Research board (TRB) 85th Annual Meeting 2006 Workshop AFF 40 (1) in the scope of Transportation Research board (TRB) 85th Annual Meeting 2006 Washington, D.C., USA 2006-01-22 2006-01-26 2016-02-19 OPUS4-4397 Beitrag zu einem Tagungsband Arndt, Ralf; Maierhofer, Christiane; Röllig, Mathias; Weritz, Friederike; Wiggenhauser, Herbert Structural investigation of concrete and masonry structures behind plaster by means of pulse phase thermography Rhode-St-Genese Karman Institute for Fluid Dynamics 2004 Proceedings of the 7th International Conference on Quantitative Infrared Thermography (QIRT 2004) 7th International Conference on Quantitative Infrared Thermography (QIRT 2004) Rhode-St-Genese, Belgien 2004-06-05 2004-06-08 I.3.1 I.3.6 2016-02-19 OPUS4-4493 Vortrag Wiggenhauser, Herbert Laser-Induced Breakdown Spectroscopy for On-Site Determination of Chloride and Sulfur content 2004 Structural Materials Technology (SMT), NDE/NDT for Highways and Bridges 2004 Structural Materials Technology (SMT), NDE/NDT for Highways and Bridges 2004 Buffalo, NY, USA 2004-09-14 2004-09-17 2016-02-19 OPUS4-4421 Beitrag zu einem Sammelband Wiggenhauser, Herbert; Taffe, Alexander Cziesielski, E. Zerstörungsfreie Prüfung im Bauwesen - Einleitung Berlin Ernst 2004 Bauphysik-Kalender 2004 3-433-01705-0 309 310 2016-02-19 OPUS4-5677 Vortrag Wiggenhauser, Herbert Zerstörungsfreie Feuchtemessung an Bauwerken 2003 Kolloquium Innovative Feuchtemessung Kolloquium Innovative Feuchtemessung Karlsruhe, Germany 2003-07-03 2003-07-04 2016-02-19 OPUS4-7695 Beitrag zu einem Sammelband Helmerich, Rosemarie; Niederleithinger, Ernst; Stoppel, Markus; Wiggenhauser, Herbert Mencik, J. The role of advanced non-destructive techniques in condition assessment of existing bridges Pardubice University of Pardubice 2005 Proceedings of the 2nd International Conference "Reliability, Safety and Diagnostics of Transport Structures and Means 2005" 80-7194-769-5 2nd International Conference "Reliability, Safety and Diagnostics of Transport Structures and Means 2005" Parduce, Czech Republic 2005-07-07 2005-07-08 111 118 2016-02-19 OPUS4-10830 Zeitschriftenartikel Wilsch, Gerd; Weritz, Friederike; Schaurich, Dieter; Wiggenhauser, Herbert Determination of chloride content in concrete structures with laser-induced breakdown spectroscopy An important criterion for the evaluation of reinforced concrete structures is the measurement of the chloride content. This will normally be done by time consuming standard chemical methods. We propose the application of a spectroscopic technique, the laser-induced breakdown spectroscopy (LIBS), which provides the advantages of a fast measurement, the potential for on-site application and the possibility to investigate a wide range of different measuring points. The surface can be scanned, or depth profiles are available from cores. Measurements can be performed directly on the sample surface and the results are available in near real time. We present LIBS results measured on concrete cores as well as on grinded and pressed material in comparison with the results of standard chemical methods. The optimum LIBS set-up and the experimental conditions to detect and measure chlorine in building materials are reported. The limits of detection were determined and calibration curves were measured. Oxford Elsevier 2005 Construction & building materials 19 10 724 730 10.1016/j.conbuildmat.2005.06.001 2016-02-19 OPUS4-12300 Zeitschriftenartikel Weritz, Friederike; Arndt, Ralf; Röllig, Mathias; Maierhofer, Christiane; Wiggenhauser, Herbert Investigation of concrete structures with pulse phase thermography The applicability of pulse phase thermography (PPT) for the investigation of structures is studied systematically on concrete test specimens and on a plastered sandstone column. In the test specimens, voids and delaminations are implemented in different depths and with different sizes, modelling real voids, honeycombing and debonding. Delaminations of plaster in concrete and masonry and behind tiles on concrete are investigated. PPT is based on the frequency analysis of the cooling down process of actively heated surfaces. Therefore, it is contactless and thus completely non-destructive (if overheating of the surface is prevented), fast and allows the inspection of large surface areas. The interpretation of amplitude and phase images gives semi-quantitative information about the observed defects. The phase images provide a deeper probing up to 10–15 cm in relation to the interpretation of the thermograms and to the amplitude images. In addition, the influence of surface inhomogeneities and non-uniform heating is reduced. Dordrecht Springer 2005 Materials and structures 38 9 843 849 10.1007/BF02481657 2016-02-19 OPUS4-12238 Beitrag zu einem Tagungsband Streicher, Doreen; Kohl, Christoph; Wiggenhauser, Herbert; Petz, J. Assessment of post tensioned box girder bridges applying automated non-destructive testing methods Washington, D.C. TRB National Research Council / Transportation Research Board 2006 Compendium of papers CD-ROM, TRB 85th annual meeting 85th TRB Annual Meeting Washington D.C., USA 2006-01-22 2006-01-26 1 13(?) 2016-02-19 OPUS4-12239 Beitrag zu einem Sammelband Streicher, Doreen; Wiggenhauser, Herbert Automatisierte zerstörungsfreie Untersuchungen an Spannbetonbrücken Berlin DGZfP Deutsche Gesellschaft für zerstörungsfreie Prüfung 2006 Fachtagung Bauwerksdiagnose 2006 - Praktische Anwendungen Zerstörungsfreier Prüfungen 3-931381-71-4 DGZfP-Fachtagung Bauwerksdiagnose "Praktische Anwendungen Zerstörungsfreier Prüfungen" Berlin, Deutschland 2006-02-22 2006-02-23 29 37 2016-02-19 OPUS4-5285 Beitrag zu einem Sammelband Arndt, Ralf; Maierhofer, Christiane; Röllig, Mathias; Weritz, Friederike; Wiggenhauser, Herbert Ortung von Putzablösungen auf Beton und Mauerwerk mit der Puls-Phasen-Thermografie Abstract In the recent years the application of infrared thermography and especially its active approaches lock-in thermography, impulse themography and pulse phase thermography (PPT) has gained more importance for non-destructive testing (NDT). In this paper it is demonstrated that PPT is very well suited for NDT in civil engineering. The method is based on pulse heating of the investigated specimen and on the observation of the cooling down process on its surface with an infrared camera. The transient behaviour is afterwards analysed with Fast Fourier Transformation, enabling the creation of phase and amplitude images with enhanced visualisation of the defects. Results of European and National (i.e. DFG) funded projects are presented, for example the detection of voids and inhomogeneities close to the surface and the localisation of delaminations on plastered concrete and masonry specimen. ZUSAMMENFASSUNG Im Rahmen eines von der Deutschen Forschungsgemeinschaft geförderten Vorhabens zur zerstörungsfreien Prüfung im Bauwesen wird in der Bundesanstalt für Materialforschung und -prüfung (BAM) in Zusammenarbeit mit der Technischen Universität Berlin (TUB) die Puls-Phasen-Thermografie (PPT) weiterentwickelt, bewertet und eingesetzt. Die durch die Impuls-Thermografie (IT) aufgenommenen Daten werden mittels Fast Fourier Transformation (FFT) bearbeitet. Die durch die FFT gewonnenen Phasenbilder reduzieren die Störeinflüsse von Oberflächeninhomogenitäten und ungleichmäßiger Erwärmung. Die dargestellten Ergebnisse zeigen deutlich, dass sich die PPT sehr gut zur zerstörungsfreien Prüfung im Bauwesen eignet. Insbesondere Inhomogenitäten im oberflächennahen Bereich, wie Ablösungen und Hohlstellen hinter Beschichtungen (Putz, CFK-Laminate etc.), aber auch Defekte in größeren Tiefen können zuverlässig geortet und bildgebend dargestellt werden. Berlin DGZfP Deutsche Gesellschaft für Zerstörungsfreie Prüfung 2004 ZfP in Forschung, Entwicklung und Anwendung - Jahrestagung 2004 3-931381-55-2 Jahrestagung Zerstörungsfreie Materialprüfung 2004 Salzburg, Österreich 2004-05-17 2004-05-19 1(?) 10(?) 2016-02-19 OPUS4-5229 Beitrag zu einem Sammelband Krause, Martin; Streicher, Doreen; Wiggenhauser, Herbert; Haardt, P.; Holst, R. Alampalli, S. Non-destructive Testing of a Post tensioned Concrete Bridge Applying an Automated Measuring System Columbus, Ohio American Society for Nondestructive Testing New York, State / Department of Transportation 2004 Structural materials technology VI 6 1-571-17150-9 6th NDT Conference: Structural Materials Technology Buffalo, NY, USA 2004-09-14 2004-09-17 488 495 2016-02-19 OPUS4-12530 Beitrag zu einem Tagungsband Niederleithinger, Ernst; Helmerich, Rosemarie; Streicher, Doreen; Stoppel, Markus; Wiggenhauser, Herbert Forde, M. Automated non-destructive investigation of railway bridge condition Edingburgh Engineering Technics Pr., 2006 Structural faults & repair 2006 (Proceedings) 0-947644-59-8 11th International Conference and Exhibiton "Structural Faults and Repair - 2006" Edinburgh, Scotland, UK 2006-06-13 2006-06-15 1 8(?) 2016-02-19 OPUS4-13689 Beitrag zu einem Tagungsband Taffe, Alexander; Wiggenhauser, Herbert Validation for Thickness Measurement in Civil Engineering with Ultrasonic Echo Berlin European Federation for Non-Destructive Testing Deutsche Gesellschaft für zerstörungsfreie Prüfung 2006 9th European Conference on NDT 3-931381-86-2 9th European Conference on NDT : ECNDT Berlin 2006 Berlin, Germany 2006-09-25 2006-09-29 1(?) 8(?) 2016-02-19 OPUS4-4401 Zeitschriftenartikel Taffe, Alexander; Gardei, André; Krause, Martin; Maierhofer, Christiane; Wiggenhauser, Herbert Automatisierung zerstörungsfreier Prüfverfahren für das Bauwesen In der BAM wurde als Gemeinschaftsvorhaben der Fachgruppe „Zerstörungsfreie Schadensdiagnose und Umweltmessverfahren" ein rechnergesteuerter Messabtaster für Bauwerksteile (Baustellenscanner) entwickelt. Es handelt sich um ein auf Schienen verfahrbares modulares System mit einem multifunktionalen Messkopf für mehrere zerstörungsfreie Prüfverfahren. Mit dem Baustellenscanner können Objekte wie Brücken oder Fundamentplatten schneller und genauer als bisher bei gleichzeitig reduziertem Personalaufwand untersucht werden. München Carl Hanser Verlag Bundesanstalt für Materialforschung und -prüfung 2004 Materialprüfung = Materials testing 46 7-8 397 403 10.1515/mt-2004-0397 2016-02-19 OPUS4-4402 Beitrag zu einem Tagungsband Taffe, Alexander; Schaurich, Dieter; Weritz, Friederike; Wiggenhauser, Herbert; Wilsch, Gerd Ermittlung des Chloridgehaltes von Betonproben mit Laser-Induzierter Breakdown Spektroskopie (LIBS) Esslingen Techn. Akad. Esslingen 2004 Bericht des 1. Kolloquium "Verkehrsbauten - Schwerpunkt Parkhäuser" 1. Kolloquium "Verkehrsbauten - Schwerpunkt Parkhäuser" Esslingen, Deutschland 2004-01-27 2004-01-28 651 657 2016-02-19 OPUS4-13866 Beitrag zu einem Sammelband Streicher, Doreen; Algernon, Daniel; Kohl, Christoph; Krause, Martin; Maierhofer, Christiane; Wiggenhauser, Herbert Cruz, P.; Frangopol, D. Development and combined application of NDT echo-methods for the investigation of post tensioned concrete bridges London Taylor & Francis International Conference on Bridge Maintenance, Safety and Management 2006 Bridge maintenance, safety, management, life-cycle performance and cost 0-415-40315-4 3rd International Conference on Bridge Maintenance, Safety and Management - "Bridge Maintenance, Safety, Management, Life-Cycle Performance and Cost" Porto, Portugal 2006-07-16 2006-07-19 1 8(?) 2016-02-19 OPUS4-13867 Beitrag zu einem Tagungsband Streicher, Doreen; Algernon, Daniel; Wöstmann, Jens; Behrens, Matthias; Wiggenhauser, Herbert Automated NDE of post-tensioned concrete bridges using imaging echo methods Berlin European Federation for Non-Destructive Testing Deutsche Gesellschaft für zerstörungsfreie Prüfung 2006 9th European Conference on NDT 3-931381-86-2 International Conference on Bridges, "Bridges" Dubrovnik, Croatia 2006-05-21 2006-05-24 985 992 2016-02-19 OPUS4-13929 Beitrag zu einem Sammelband Taffe, Alexander; Wiggenhauser, Herbert Ermittlung der Messunsicherheit bei der Validierung von ZfP-Verfahren im Bauwesen Düsseldorf VDI-Verl. 2006 Messunsicherheit praxisgerecht bestimmen - Grundlagen, Praxisbeispiele 3-18-091947-7 "Messunsicherheit praxisgerecht bestimmen" Erfurt, Deutschland 2006-11-13 2006-11-15 1947 327 336 2016-02-19 OPUS4-4585 Zeitschriftenartikel Kohl, Christoph; Krause, Martin; Maierhofer, Christiane; Mayer, K.; Wöstmann, Jens; Wiggenhauser, Herbert 3D-visualisation of NDT data using a data fusion technique Northampton British Institute of Non-Destructive Testing 2003 Insight 45 12 800 808 2016-02-19 OPUS4-4556 Vortrag Wiggenhauser, Herbert Development and Application of Echo-Methods for NDE of Post Tensioned Concrete Bridges 2004 2nd International Conference on Bridge Maintenance, Safety and Management (IABMAS '04) 2nd International Conference on Bridge Maintenance, Safety and Management (IABMAS '04) Kyoto, Japan 2004-10-18 2004-10-22 2016-02-19 OPUS4-4570 Vortrag Wiggenhauser, Herbert Bildgebende Untersuchung von Spannkanälen mit komplementären zerstörungsfreien Prüfverfahren 2004 Tagung "Bildgebende ZfP-Methoden-Aussagekraft-Messunsicherheit", EMPA Akademie Dübendorf Tagung "Bildgebende ZfP-Methoden-Aussagekraft-Messunsicherheit", EMPA Akademie Dübendorf Dübendorf, Switzerland 2004-04-01 2016-02-19 OPUS4-5603 Beitrag zu einem Sammelband Kohl, Christoph; Krause, Martin; Maierhofer, Christiane; Wöstmann, Jens; Wiggenhauser, Herbert Datenfusion komplementärer Impuls-Echo Verfahren zur zerstörungsfreien Untersuchung von Betonbauteilen Berlin DGZfP Deutsche Gesellschaft für Zerstörungsfreie Prüfung 2004 ZfP in Forschung, Entwicklung und Anwendung - Jahrestagung 2004 3-931381-55-2 Jahrestagung Zerstörungsfreie Materialprüfung 2004 Salzburg, Österreich 2004-05-17 2004-05-19 1 15(?) 2016-02-19 OPUS4-11343 Beitrag zu einem Tagungsband Taffe, Alexander; Wiggenhauser, Herbert Zerstörungsfreie Prüfverfahren im Bauwesen (ZfPBau) Langenporzelten Eisenbahnbundesamt 2005 Bericht vom Seminar des Eisenbahnbundesamtes (EBA) Seminar des Eisenbahnbundesamtes (EBA) Langenporzelten, Deutschland 2005-08-25 18 Seiten 2016-02-19 OPUS4-11867 Zeitschriftenartikel Maierhofer, Christiane; Brink, Arne; Röllig, Mathias; Wiggenhauser, Herbert Detection of shallow voids in concrete structures with impulse thermography and radar New thermography systems enable the application of active investigation techniques, i.e. the observation of the cooling down process after heating the surface of a structure under investigation. Defects like voids in concrete having a different thermal diffusivity in comparison to the bulk material are visualised by different surface temperatures. The differences between temperature transient curves above sound regions and above inhomogeneities are expected to include information about the defect parameters. Experimental investigations with impulse thermography and radar on a concrete test specimen containing voids were analysed. Radar was used to determine the depth of the voids. The influence of size and depth of the voids on the temperature transient curves was studied for different heating times. The transient curves were also fitted with a simple semi-empirical model. Oxford Butterworth-Heinemann 2003 NDT & E international 36 4 257 263 2016-02-19 OPUS4-4984 Zeitschriftenartikel Maierhofer, Christiane; Wiggenhauser, Herbert; Brink, Arne; Röllig, Mathias Quantitative numerical analysis of transient IR-experiments on buildings Impulse-thermography has been established as a fast and reliable tool in many areas of non-destructive testing. In recent years several investigations have been done to apply active thermography to civil engineering. For quantitative investigations in this area of application, finite difference calculations have been performed for systematic studies on the influence of environmental conditions, heating power and time, defect depth and size and thermal properties of the bulk material (concrete). The comparison of simulated and experimental data enables the quantitative analysis of defects. Oxford Pergamon Press 2004 Infrared physics & technology 46 7th International Workshop on Advanced Infrared Technology and Applications ; 7th AITA Conference Pisa, Italy 2003-09-09 2003-09-11 1-2 173 180 10.1016/j.infrared.2004.03.022 2016-02-19 OPUS4-11049 Zeitschriftenartikel Kääriäinen, H.; Rudolph, Michael; Schaurich, Dieter; Tulla, K.; Wiggenhauser, Herbert Moisture measurements in building materials with microwaves The method requires two parallel boreholes in the specimen in which two microwave antennae can be moved. The moisture content in the material can be calculated from the microwave intensity transmitted between the two boreholes. Moisture profiles along the boreholes can be obtained by moving the antennae in steps along the length of the boreholes and taking measurements at each step. The microwave frequencies used in the laboratory measurements ranged from 8 to 16.5 GHz in steps of 0.5 GHz. The diameters of the antennae were between 7 and 9 mm, and of the boreholes between 8 and 12 mm. The microwave method produced measurement uncertainties between 0 and 2% by volume for all the materials studied in this report. Oxford Butterworth-Heinemann 2001 NDT & E international 34 6 389 394 2016-02-19 OPUS4-11050 Zeitschriftenartikel Schubert, F.; Wiggenhauser, Herbert; Lausch, Regine On the accuracy of thickness measurements in impact-echo testing of finite concrete specimens - numerical and experimental results In impact-echo testing of finite concrete structures, reflections of Rayleigh and body waves from lateral boundaries significantly affect time-domain signals and spectra. In the present paper we demonstrate by numerical simulations and experimental measurements at a concrete specimen that these reflections can lead to systematic errors in thickness determination. These effects depend not only on the dimensions of the specimen, but also on the location of the actual measuring point and on the duration of the detected time-domain signal. Amsterdam Elsevier 2004 Ultrasonics 42 1-9 897 901 10.1016/j.ultras.2004.01.076 2016-02-19 OPUS4-11051 Beitrag zu einem Tagungsband Algernon, Daniel; Wiggenhauser, Herbert; Abraham, O. Scanning impact-echo for the investigation of tendon ducts in concrete 2005 Memorandum of the Workshop of COST on NDT Assessment and New Systems in Prestressed Concrete Structures Workshop of COST on NDT Assessment and New Systems in Prestressed Concrete Structures 2005-09-18 2005-09-20 55 62 2016-02-19 OPUS4-10986 Vortrag Wiggenhauser, Herbert Scanning impact-echo for the investigation of tendon ducts in concrete 2005 Workshop of COST on NDT Assessment and New Systems in Prestressed Concrete Structures Workshop of COST on NDT Assessment and New Systems in Prestressed Concrete Structures Kielce, Poland 2005-09-18 2005-09-20 2016-02-19 OPUS4-12033 Vortrag Wiggenhauser, Herbert Non-destructive techniques for the condition assessment of railway bridges 2006 Transportation Research Boards (TRB) 85th Annual Meeting Transportation Research Boards (TRB) 85th Annual Meeting Washington, D.C., USA 2006-01-22 2006-01-26 2016-02-19 OPUS4-12037 Beitrag zu einem Tagungsband Helmerich, Rosemarie; Niederleithinger, Ernst; Wiggenhauser, Herbert A toolbox with non-destructive testing methods for the condition assessment of railway bridges The unified economic structure of the European market requires a unified transport infrastructure to ensure seamless and barrierfree transportation of passengers and goods. The European commission is funding the European Integrated Project Sustainable Bridges to comply with future traffic demands. The main objective of the project is to reliably assess and upgrade the bridge infrastructure for the required increase of axle loads and transport volume. 32 Institutes from 12 countries develop unified procedures for the assessment and improvement of the existing railway bridge stock under the guidance and review of six major European railway companies. Non destructive testing (NDT) is given a high priority. One of the work packages concentrates on the potential of advanced NDT-methods and creates a toolbox with advisable methods for the condition assessment of all types of railway bridges. Although NDT-methods are implemented in the quality assurance process in many industries, their application in the railway infrastructure is not common. Only a few countries have included selected NDT-methods into advanced condition assessment procedures for the management of their bridge stock. This paper describes also current activities to enhance pulse-phase thermography, impulse-radar and acoustic methods. The advanced methods enable infrastructure owners to verify construction plans, to assess structures, repair and strengthening quality or to identify in-service damages. Latest development is an automated scanning system for combined acoustic and electromagnetic measurements. The results are then combined through data fusion techniques to further increase their value for the bridge owners. Washington, D.C. TRB National Research Council / Transportation Research Board 2006 Compendium of papers CD-ROM, TRB 85th annual meeting 85th TRB Annual Meeting Washington, DC, USA 2006-01-22 2006-01-26 1 12(?) 2016-02-19 OPUS4-27999 Zeitschriftenartikel Shokouhi, Parisa; Zoëga, Andreas; Wiggenhauser, Herbert; Fischer, G. Surface wave velocity-stress relationship in uniaxially loaded concrete The sonic surface wave (or Rayleigh wave) velocity measured on prismatic concrete specimens under uniaxial compression was found to be highly stress-dependent. At low stress levels, the acoustoelastic effect and the closure of existing microcracks results in a gradual increase in surface wave velocities. At higher stress levels, concrete suffers irrecoverable damage: the existing microcracks widen and coalesce and new microcracks form. This progressive damage process leads first to the flattening and eventually the drop in the velocity-stress curves. Measurements on specimens undergoing several loading cycles revealed that the velocities show a stress-memory effect in good agreement with the Kaiser effect. Comparing the velocities measured during loading and unloading, the effects of stress and damage on the measured velocities could be differentiated. Moreover, the stress dependency of surface wave velocity proved to be direction-dependent. The velocity increases and decreases the most when measured parallel and perpendicular to the loading axis, respectively. Farmington, Mich., USA ACI 2012 ACI materials journal 109 2 141 148 2016-02-20 OPUS4-28077 Vortrag Wiggenhauser, Herbert Borehole based methods for length determination of existing piles, State of the Art of NDE Protocols for Bridge Management, Multi-probe ultrasonics testing for detection of delamination in concrete bridge decks 2013 NDT Workshop NDT Workshop Lansing, MI, USA 2013-03-28 2013-03-28 2016-02-20 OPUS4-24721 Vortrag Wiggenhauser, Herbert NDT-CE Challenges and Lessons learned 2011 SIBTEST 2011, NDT-Workshop SIBTEST 2011, NDT-Workshop Gorny, Altai Krai, Russia 2011-07-25 2011-07-29 2016-02-19 OPUS4-24659 Beitrag zu einem Tagungsband Stoppel, Markus; Taffe, Alexander; Wiggenhauser, Herbert; Kurz, J.H.; Boller, C. Grantham, M.; Mechtcherine, V.; Schneck, U. Automated multi-sensor systems in civil engineering for condition assessment of concrete structures London Taylor & Francis Technische Universität Dresden 2012 Concrete solutions 2011 - 4th International conference on concrete repair (Proceedings) 978-0-415-61-622-5 Concrete solutions 2011 - 4th International conference on concrete repair Dresden, Germany 2011-09-26 2011-09-28 397 403 2016-02-19 OPUS4-24895 Vortrag Wiggenhauser, Herbert Non-Destructive Testing in Civil Engineering 2011 SVTI-Workshop "ZfP für Betonbauteile in Kernkraftwerken" SVTI-Workshop "ZfP für Betonbauteile in Kernkraftwerken" Zurich, Switzerland 2011-11-16 2016-02-19 OPUS4-24774 Vortrag Wiggenhauser, Herbert Zerstörungsfreie Prüfung im Bauwesen - 3 Fallstudien: - Automatisierte Prüfung großer Flächen - Bestimmung von Spanngliedlagen - Untersuchungen an der Florisdorfer Brücke 2011 FSV Seminar Brückenprüfer - Erfahrungsaustausch FSV Seminar Brückenprüfer - Erfahrungsaustausch Vienna, Austria 2011-11-22 2016-02-19 OPUS4-27414 Vortrag Wiggenhauser, Herbert Quality Control of Hydrophobic Coatings with an Integrated Marker Element by Laser-Induced Breakdown Spectroscopy (LIBS) 2012 International Congress on Durability of Concrete International Congress on Durability of Concrete Trondheim, Norway 2012-06-18 2012-06-21 2016-02-20 OPUS4-27415 Vortrag Wiggenhauser, Herbert Laser-Induced Breakdown Spectroscopy for Fast Analysis of Ingress Profiles of Ions on Concrete 2012 NDE/NDT for Highways and Bridges: Structural Materials Technology (SMT) NDE/NDT for Highways and Bridges: Structural Materials Technology (SMT) New York City, NY, USA 2012-08-21 2012-08-24 2016-02-20 OPUS4-27528 Beitrag zu einem Tagungsband Wilsch, Gerd; Schaurich, Dieter; Wiggenhauser, Herbert Leeman, C.M. Laser-induced breakdown spectroscopy for fast analysis of ingress profiles of ions on concrete American Society for Nondestructive Testing 2012 NDE/NDT for highways and bridges - Structural materials technology -SMT- (Proceedings) 978-1-57117-235-8 NDE/NDT for highways and bridges - Structural materials technology -SMT- New York City, NY, USA 2012-08-21 2012-08-24 384 391 2016-02-20 OPUS4-27631 Zeitschriftenartikel Prasad M, K.; Wiggenhauser, Herbert; Balasubramaniam, Krishnan Detection of honeycomb defects in reinforced concrete structures using acoustic pulse-echo methods and wavelet transforms Honeycombs/compaction faults occur in the concrete structures due to improper solidification of the concrete, which may reduce the strength of the concrete and also act as a passage for the water/acids that further corrodes the reinforcements. This paper explores about the acoustic pulse-echo techniques for the detection of honeycomb defects in a laboratory specimen located at the Federal Institute for Materials Research and Testing (BAM), Berlin. Since concrete is an inhomogeneous medium, the defect Signals are masked by the material noise due to large amount of scattering/ reflections of acoustic waves. A filtering method using the discrete wavelet transforms is applied on the ultrasonic time Signals for the better localization of defects. Chennai ISNT Indian Society for Non-Destructive Testing 2011 Journal of non-destructive testing & evaluation 10 3 53 59 2016-02-20 OPUS4-25552 Zeitschriftenartikel Shokouhi, Parisa; Wöstmann, Jens; Schneider, Gerhard; Milmann, Boris; Taffe, Alexander; Wiggenhauser, Herbert Nondestructive detection of delamination in concrete slabs - multiple-method investigation The delamination of concrete slabs is the separation along a plane roughly parallel to, and generally near, the surface. Corrosion-induced delamination is a common problem in old concrete bridge decks. If undetected, delaminations could expand, reach the surface, and result in spalling. Early detection of delamination is necessary for planning timely repairs that prevent costly deck replacement projects. Most bridge owners rely on routine visual and traditional surveys of bridge deck conditions. These surveys are highly subjective and can locate only large shallow delaminated zones. Several nondestructive testing (NDT) techniques have recently been employed for bridge deck evaluation to obtain more objective and comprehensive assessment. The reliability of applicable methods needs to be established before a greater role for NDT in routine inspections can be encouraged. This paper presents a validation study aimed at evaluating the effectiveness of three NDT techniques, namely impact echo, ultrasound (US) echo, and US linear array, in detection of delamination. This study is unique because the subject test specimens were deteriorated bridge deck segments preserved from the demolition of a prestressed box girder bridge. The results of the tests conducted on one of the specimens are presented and discussed here: impact echo provided satisfactory overall assessment, but the individual results were often difficult to interpret; US echo detected deep delaminations but not shallow ones; and US linear array located the extent of deep delaminations and provided indications of shallow ones. Washington, DC National Research Council 2011 Transportation research record 2251 103 113 10.3141/2251-11 2016-02-19 OPUS4-26288 Zeitschriftenartikel Lai Wai-Lok, Wallace; Kind, Thomas; Wiggenhauser, Herbert Using ground penetrating radar and time-frequency analysis to characterize construction materials For decades, applications of nondestructive evaluation-civil engineering (NDE-CE) focus on object identifications (such as steel bars, tendon ducts and backwall reflections) in infrastructures. Because of the advantage of efficient visualization of internal structure, utilization of these methods can probably be extended to material characterization (MC) of aging and adversely exposed infrastructures. However, two factors yield a big gap between NDE and MC. First, for the ease of visualization, the primary focus of NDE-signal processing is object identification, which usually alters the originality of the signal. Second, there is lack of relationship and inverse models bridging the NDE-derived and conventional material properties compared to other disciplines of science, such as geophysics. These disadvantages make laboratory and field-scale NDE-MC still a far-reaching holy grail and is possibly the greatest hurdle to be regularly adopted in CE structures. This paper attempts to address this gap from object identification to MC using ground penetrating radar (GPR) as one of the most frequently used NDE-CE methods, and signal processing with joint time–frequency domain (JTFA) analysis. Three examples of material property characterization regarding the individual effects of steel bar corrosion in concrete, hydration and moisture content distribution of construction materials are given. Oxford Butterworth-Heinemann 2011 NDT & E international 44 1 111 120 10.1016/j.ndteint.2010.10.002 2016-02-19 OPUS4-26289 Zeitschriftenartikel Lai Wai-Lok, Wallace; Kind, Thomas; Wiggenhauser, Herbert Frequency-dependent dispersion of high-frequency ground penetrating radar wave in concrete This paper studies the dielectric dispersion of high frequency radar wave in concrete in early-aged and hardened concrete specimens. Frequency-dependent spectra of phase velocity ν(ω) were measured to deduce the spectra of real part of dielectric permittivity ε'(ω). The dispersion was measured by three high nominal ground penetrating radar frequencies (1.5, 1.6 and 2.6 GHz), experimenting on two steel bars with concrete cover 50 and 100 mm. It was found that ν(ω) and ε'(ω) dispersed at lower frequency, but became stable at high frequency regions, which agrees with the classical GPR plateau. The same frequency components at different nominal antenna frequencies show a close range of ν(ω) and ε'(ω) in concrete of different ages. The results in this paper warrant further investigation of using GPR wave to study material properties. Oxford Butterworth-Heinemann 2011 NDT & E international 44 3 267 273 10.1016/j.ndteint.2010.12.004 2016-02-19 OPUS4-5209 Vortrag Wiggenhauser, Herbert Zerstörungsfreie Prüfverfahren im Bauwesen - Radar, Ultraschall und Impact-Echo zur Bewehrungsortung, Überdeckungsmessung und Hüllrohruntersuchung 2004 47. Beton-Tage 47. Beton-Tage Ulm, Germany 2004-02-15 2016-02-19 OPUS4-16650 Beitrag zu einem Tagungsband Shokouhi, Parisa; Feldmann, Rüdiger; Wiggenhauser, Herbert Stress-Dependency of Sonic Velocity in Concrete under Unaxial Load Washington, DC TRB National Research Council / Transportation Research Board 2008 Proceedings of the TRB 87th Annual Meeting CD-ROM (Paper 08-1450 / Session 568) 1 15 2016-02-19 OPUS4-16651 Beitrag zu einem Tagungsband Helmerich, Rosemarie; Niederleithinger, Ernst; Algernon, Daniel; Streicher, Doreen; Wiggenhauser, Herbert Bridge inspection and condition assessment in Europe Washington, DC TRB National Research Council / Transportation Research Board 2008 Proceedings of the TRB 87th Annual Meeting TRB 87th annual meeting Washington, D.C., USA 2008-01-13 2008-01-17 CD-ROM (Paper 08-1450 / Session 568) 1 13 2016-02-19 OPUS4-16664 Vortrag Wiggenhauser, Herbert Alkali transport in concrete measured with LIBS 2007 ACI Fall Convention, ACI Commitee 228 ACI Fall Convention, ACI Commitee 228 Fajardo, Puerto Rico 2007-10-14 2016-02-19 OPUS4-16665 Vortrag Wiggenhauser, Herbert Alkali transport in concrete measured with LIBS 2008 Transportation Research Board (TRB) 2008, Committee AFN010 Transportation Research Board (TRB) 2008, Committee AFN010 Washington, D.C., USA 2008-01-13 2008-01-17 2016-02-19 OPUS4-17469 Beitrag zu einem Tagungsband Algernon, Daniel; Wiggenhauser, Herbert Impact-Echo Data Analysis Based on the Hilbert-Huang Transform Washington, D.C., USA Transportation Research Board (TRB) of the National Academies 2007 TRB 86th Annual Meeting, January 21-25, 2007, Washington, D.C., USA TRB 86th Annual Meeting Washington, D.C., USA 2007-01-21 2007-01-25 1 14 2016-02-19 OPUS4-17925 Zeitschriftenartikel Beutel, R.; Reinhardt, H.-W.; Grosse, C.U.; Glaubitt, A.; Krause, Martin; Maierhofer, Christiane; Algernon, Daniel; Wiggenhauser, Herbert; Schickert, M. Comparative performance tests and validation of NDT methods for concrete testing Validation of non-destructive testing methods is necessary to create a common basis where different systems can be compared and their applications and limitations be identified. This can be achieved through comparing the measurements taken by several systems used for a common diagnostic purpose under practical but controlled testing conditions. Well-designed small and large laboratory or field specimens promise such conditions. The special concrete specimen (LCS) at BAM was constructed for validation purposes, in particular, to be used for evaluating the performance of echo methods. The thickness of the specimen is varying and it contains carefully designed built-in faults, such as voids, honeycombs and tendon ducts with various degrees of grouting defects. Since the geometry and condition of the defects are known, it can be used to compare the performance of radar, ultrasonic, impact-echo. The research was conducted within the Research group FOR384, sponsored by the German Research Society DFG. New York, NY Plenum Press 2008 Journal of nondestructive evaluation 27 1-3 59 65 10.1007/s10921-008-0037-1 2016-02-19 OPUS4-4761 Vortrag Wiggenhauser, Herbert Complementary application of radar, impact-echo and ultrasonics for testing concrete structures and metallic tendon ducts 2004 Transportation Research Board of the National Academies, 83rd Annual Meeting 2005 Transportation Research Board of the National Academies, 83rd Annual Meeting 2005 Washington, D.C., USA 2004-01-11 2004-01-15 2016-02-19 OPUS4-4739 Beitrag zu einem Sammelband Wiggenhauser, Herbert; Gardei, André; Kohl, Christoph; Maierhofer, Christiane; Krause, Martin; Streicher, Doreen Watanabe, E.; Frangopol, D. Development and Application of Echo-Methods for NDE of Post Tensioned Concrete Bridges Leiden Balkema 2004 Bridge maintenance, safety, management and cost 90-5809-680-7 2nd International Conference on Bridge Maintenance, Safety and Management Kyoto, Japan 2004-10-19 2004-10-22 2016-02-19 OPUS4-10922 Vortrag Wiggenhauser, Herbert Automatisierte Brückenuntersuchungen mit kombinierten Verfahren - Anwendung von Radar, Impact-Echo und Ultraschallecho an Spannbetonbrücken 2005 Fachtagung 2005 des Deutschen Ausschuss für Stahlbetonbau (DAfStb), Zerstörungsfreie Prüfverfahren und Bauwerksdiagnose im Betonbau Fachtagung 2005 des Deutschen Ausschuss für Stahlbetonbau (DAfStb), Zerstörungsfreie Prüfverfahren und Bauwerksdiagnose im Betonbau Berlin, Germany 2005-03-10 2005-03-11 2016-02-19 OPUS4-12648 Zeitschriftenartikel Wiggenhauser, Herbert; Taffe, Alexander Garant für gute Qualität, Werkzeug für fundierte Analysen - Was leisten zerstörungsfreie Prüfverfahren im Bauwesen? Berlin Bundesingenieurkammer 2006 Deutsches Ingenieur-Blatt 7/8 22 28 2016-02-19 OPUS4-17732 Vortrag Wiggenhauser, Herbert Entwicklung und Anwendung zerstörungsfreier Prüfverfahren im Betonbau 2008 Kolloquium Konstruktiver Ingenieurbau (SS 2008) an der Universität Karlsruhe (TH) Kolloquium Konstruktiver Ingenieurbau (SS 2008) an der Universität Karlsruhe (TH) Karlsruhe, Germany 2008-06-26 2016-02-19 OPUS4-18118 Vortrag Wiggenhauser, Herbert Non-Destructive Assessment of Reinforced Concrete Structures with Combined Methods 2008 OECD - Nuclear Energy Agency Workshop: Ageing Management of Thick Walled Concrete Structures OECD - Nuclear Energy Agency Workshop: Ageing Management of Thick Walled Concrete Structures Prague, Czech Republic 2008-10-01 2008-10-03 2016-02-19 OPUS4-18415 Vortrag Wiggenhauser, Herbert OSSCAR - Development of an On-Site SCanneR for automated non-destructive bridge testing 2008 2nd International Conference on Concrete Repair, Rehabilitation and Retrofitting ICCRRR 2008 2nd International Conference on Concrete Repair, Rehabilitation and Retrofitting ICCRRR 2008 Cape Town, South Africa 2008-11-24 2008-11-26 2016-02-19 OPUS4-18416 Vortrag Wiggenhauser, Herbert Development of a portable LIBS-device for quality assurance in concrete repair 2008 2nd International Conference on Concrete Repair, Rehabilitation and Retrofitting ICCRRR 2008 2nd International Conference on Concrete Repair, Rehabilitation and Retrofitting ICCRRR 2008 Cape Town, South Africa 2008-11-24 2008-11-26 2016-02-19 OPUS4-6082 Vortrag Wiggenhauser, Herbert On-site investigation techniques for the structural assessment of historic masonry buildings 2002 5th EC Conference Cultural Heritage Research: A Pan European Challenge 5th EC Conference Cultural Heritage Research: A Pan European Challenge Kraków, Poland 2002-05-16 2002-05-18 2016-02-19 OPUS4-10305 Zeitschriftenartikel Taffe, Alexander; Wiggenhauser, Herbert Zerstörungsfreie Zustandsermittlung und Qualitätssicherung in der Betoninstandsetzung Eine realistische Abschätzung des finanziellen Instandsetzungsaufwands im Vorfeld einer Betoninstandsetzung basiert auf der detaillierten und belastbaren Kenntnis des Bauwerkszustands. Mit Hilfe zerstörungsfreier Prüfverfahren im Bauwesen (ZfPBau-Verfahren) können Schadensart, -umfang und -ursachen ermittelt und wirksame Instandsetzungsmaßnahmen festgelegt werden. In dem Beitrag wird auf folgende Anwendungsgebiete von ZfPBau-Verfahren hingewiesen: Brückenprüfung nach DIN 1076 (Objektbezogene Schadensanalyse), RI-ZFP-TU - Richtlinie für die Anwendung der zerstörungsfreien Prüfung von Tunnelinnenschalen (Qualitätssicherung) und Nachhaltiges Bauen durch Wiedernutzung vorhandener Bausubstanz. Es wird eine Übersicht akustischer (Ultraschallecho, Impakt-Echo), elektromagnetischer (Radar, Infrarot-Thermografie, Radiografie), elektrochemischer (Potentialfeldmessung), magnetischer (Remanenzmagnetismus-Verfahren) und spektroskopischer (Laser-Induzierte Breakdown Spektroskopie) ZfPBau-Verfahren gegeben. Die Schwerpunkte der beschriebenen baupraktischen Anwendungen bilden Zustandsermittlung von Bauteilen und Qualitätssicherung von Instandsetzungsmaßnahmen. Dabei werden Leistungsfähigkeit und Grenzen der Verfahren anhand von durchgeführten Untersuchungen aufgezeigt. Die aktuellen Literaturhinweise auf Verfahrensgrundlagen, detaillierte Messergebnisse und Anwendungshinweise ermöglichen ein vertieftes Studium. Die zusammenfassende Betrachtung der beschriebenen Verfahren soll dem planenden bzw. bauüberwachenden Ingenieur Hinweise geben, die ihm eine erste Einschätzung erlauben, ob und in welchem Maß der Einsatz eines ZfPBau-Verfahrens als erfolgversprechend angesehen werden kann. Berlin Ernst 2005 Beton- und Stahlbetonbau 100 S1 2 14 10.1002/best.200590165 2016-02-19 OPUS4-16563 Vortrag Wiggenhauser, Herbert Qualitätssicherung im Bauwesen mit zerstörungsfreien Prüfverfahren 2007 Vorlesung an der Hochschule Konstanz, Fak. Bauingenieurwesen Vorlesung an der Hochschule Konstanz, Fak. Bauingenieurwesen Konstanz, Germany 2007-12-05 2016-02-19 OPUS4-16594 Vortrag Wiggenhauser, Herbert Bridge inspection and condition assessment in Europe 2008 Transportation Research Board (TRB) 87th Annual Meeting, Session 660 Transportation Research Board (TRB) 87th Annual Meeting, Session 660 Washington, D.C., USA 2008-01-13 2008-01-17 2016-02-19 OPUS4-16596 Vortrag Wiggenhauser, Herbert Validation process 2008 Transportation Research Board (TRB) 87th Annual Meeting, Commitee AFF40 Transportation Research Board (TRB) 87th Annual Meeting, Commitee AFF40 Washington, D.C., USA 2008-01-13 2008-01-17 2016-02-19 OPUS4-16597 Vortrag Wiggenhauser, Herbert Imaging ultrasound on concrete 2008 Transportation Research Board (TRB) 87th Annual Meeting, Commitee AFF40 Transportation Research Board (TRB) 87th Annual Meeting, Commitee AFF40 Washington, D.C., USA 2008-01-13 2008-01-17 2016-02-19 OPUS4-16598 Vortrag Wiggenhauser, Herbert Horstwalde center for validation, training and research in NDT in civil engineering 2008 Transportation Research Board (TRB) 87th Annual Meeting, Commitee AFF40(1) Transportation Research Board (TRB) 87th Annual Meeting, Commitee AFF40(1) Washington, D.C., USA 2008-01-13 2008-01-17 2016-02-19 OPUS4-16553 Vortrag Wiggenhauser, Herbert NDT and its application in civil engineering 2007 CBRI Seminar CBRI Seminar Roorkee, India 2007-02-07 2016-02-19 OPUS4-16554 Vortrag Wiggenhauser, Herbert NDT in civil engineering 2007 CBRI Seminar CBRI Seminar Roorkee, India 2007-02-02 2016-02-19 OPUS4-16555 Vortrag Wiggenhauser, Herbert Bridge testing using combined NDT methods 2007 IGCAR IGCAR Kalpakkam, India 2007-02-23 2016-02-19 OPUS4-16556 Vortrag Wiggenhauser, Herbert NDT activities of HW Reinhardt - a short summary 2007 ACM-Tagung (Ehrenkolloqium) zu Ehren Herrn Reinhardt an der Universität Stuttgart ACM-Tagung (Ehrenkolloqium) zu Ehren Herrn Reinhardt an der Universität Stuttgart Stuttgart, Germany 2007-07-23 2016-02-19 OPUS4-16557 Vortrag Wiggenhauser, Herbert Automated NDE of post-tensioned concrete bridges 2007 LTBP Workshop an der EMPA LTBP Workshop an der EMPA Zurich, Switzerland 2007-09-11 2016-02-19 OPUS4-16558 Vortrag Wiggenhauser, Herbert Automated NDE of post-tensioned concrete bridges 2007 Seminar University Chengdu Seminar University Chengdu Chengdu, China 2007-09-17 2016-02-19 OPUS4-16559 Vortrag Wiggenhauser, Herbert Automated NDE of post-tensioned concrete bridges 2007 Workshop Railway Organisation Workshop Railway Organisation Xining, China 2007-09-19 2016-02-19 OPUS4-16560 Vortrag Wiggenhauser, Herbert Data fusion and imaging of NDT data 2007 ACI Fall Convention, ACI Session ACI Fall Convention, ACI Session Fajardo, Puerto Rico 2007-10-18 2016-02-19 OPUS4-16561 Vortrag Wiggenhauser, Herbert Recent advances in NDE in civil engineering 2007 ISTN, NDE 2007 ISTN, NDE 2007 Vadodara, India 2007-11-27 2016-02-19 OPUS4-16562 Vortrag Wiggenhauser, Herbert Zerstörungsfreie Prüfung von Brücken 2007 Vorlesung an der Hochschule Konstanz, Fak. Bauingenieurwesen Vorlesung an der Hochschule Konstanz, Fak. Bauingenieurwesen Konstanz, Germany 2007-12-05 2016-02-19 OPUS4-18037 Zeitschriftenartikel Helmerich, Rosemarie; Niederleithinger, Ernst; Algernon, Daniel; Streicher, Doreen; Wiggenhauser, Herbert Bridge Inspection and Condition Assessment in Europe The European infrastructure asset has developed historically and is characterized by nation-specific construction processes. Inspection, condition assessment, and maintenance procedures differ from country to country. Because of historical and political circumstances, national infrastructure assets are maintained at different levels, too. Since the budget for maintaining the bridge infrastructure less and less meets the demands of a growing bridge stock, bridge inspection, maintenance, and life-cycle considerations gain higher importance. The need exists to develop effective diagnosis tools for early detection of construction faults, defects, and deterioration processes during inspection, to keep the bridge infrastructure at an acceptable level, from structural safety and economic viewpoints. An overview on the latest research projects and integrated bridge management systems in Europe is given. The potentials of nondestructive testing (NDT) are presented, with special focus on technical advances of NDT applications to reinforced concrete (RC) and posttensioned concrete bridges. Although NDT is not regularly integrated in these processes, the application brings valuable information on the current condition of the inner structure in called-in special inspections. NDT-automation and the application of imaging echo methods, combined with advanced data processing, produce a surprising level of information about the inner structure of massive RC slabs up to a depth of about 60 cm. Detected inhomogeneity and scatterers of acoustic or electromagnetic waves can be visualized in vertical or horizontal slices through the structure or animations. The fusion of different three-dimensional data sets of processed data improves the interpretability and accuracy of the results. Washington, DC National Research Council 2008 Transportation research record 2044 31 38 10.3141/2044-04 2016-02-19 OPUS4-17998 Beitrag zu einem Tagungsband Wiggenhauser, Herbert; Taffe, Alexander; Streicher, D. Brückenuntersuchung mit automatisierten Verfahren - Neue Entwicklungen Berlin Deutsche Gesellschaft für Zerstörungsfreie Prüfung 2008 Praktische Anwendungen Zerstörungsfreier Prüfungen und Zukunftsaufgaben - Tagungsband der Fachtagung Bauwerksdiagnose 2008 978-3-940283-08-5 Fachtagung Bauwerksdiagnose - Praktische Anwendungen Zerstörungsfreier Prüfungen und Zukunftsaufgaben Berlin, Deutschland 2008-02-21 2008-02-22 112 1 8 (Vortrag 14) 2016-02-19 OPUS4-18013 Vortrag Wiggenhauser, Herbert Research in NDT-CE at BAM Berlin 2006 NDT Conference JSNT NDT Conference JSNT Tokyo, Japan 2006-08-01 2016-02-19 OPUS4-18014 Vortrag Wiggenhauser, Herbert Research in NDT-CE at BAM Berlin 2006 Seminar University of Texas at El Paso Seminar University of Texas at El Paso El Paso, TX, USA 2006-08-09 2016-02-19 OPUS4-18015 Vortrag Wiggenhauser, Herbert Research in NDT-CE at BAM Berlin 2006 Seminar Wayne State University Seminar Wayne State University Detroit, MI, USA 2006-08-21 2016-02-19 OPUS4-14036 Zeitschriftenartikel Streicher, Doreen; Kohl, Christoph; Wiggenhauser, Herbert; Taffe, Alexander Automatisierte zerstörungsfreie Zustandsuntersuchungen von Brückenbauwerken Zerstörungsfreie Prüfverfahren im Bauwesen werden zunehmend für großflächige und detaillierte Zustandsuntersuchungen von Bauwerken angewendet. Für gezielte Untersuchungen von spanngliedführenden Bereichen mit einem Schadensverdacht in Spannbetonbauwerken eignen sich die Prüfverfahren Ultraschallecho, Impakt-Echo und Radar. Eine nennenswerte Verbesserung der Ergebnisse und deren Interpretation wurde in den letzten Jahren durch die weiterführende Datenauswertung mit Hilfe von 3D-Rekonstruktionsrechnungen und der Kombination von Meßdaten durch Datenfusion erreicht. Die Anwendung der Verfahren mit automatisierter Meßwerterfassung wird für Fahrbahnplatten und Hohlkastenstege dargestellt und diskutiert. Ergebnisse einer Meßunsicherheitsbetrachtung und deren Bedeutung werden an einer Fundamentplatte aufgezeigt. Translated Abstract Automated Non-Destructive Assessment of Bridges Non-destructive test methods in civil engineering are increasingly used for large-area investigations of structures. The test methods ultrasonic-echo, impact-echo and radar are well suited for detailed investigations of pre-stressed areas at pt-concrete structures. A significant improvement of the results and their interpretations has been achieved in recent years using advanced data analysis procedures such as 3D-reconstructions and the fusion of data. The automated application of the methods has been carried out successfully at decks and webs of pre-stressed box girder bridges. The achieved results are discussed in detail. The measurement uncertainty and its importance for the results are presented considering as example a foundation slab. Berlin Ernst 2006 Beton- und Stahlbetonbau 101 5 330 342 10.1002/best.200600479 2016-02-19 OPUS4-14037 Beitrag zu einem Sammelband Niederleithinger, Ernst; Helmerich, Rosemarie; Wiggenhauser, Herbert Cruz, P.; Frangopol, D. Trends in bridge condition assessment using non-destructive testing methods London Taylor & Francis International Conference on Bridge Maintenance, Safety and Management 2006 Bridge maintenance, safety, management, life-cycle performance and cost 0-415-40315-4 Bridge Maintenance, Safety, Management, Life-Cycle Performance and Cost Porto, Portugal 2006-07-16 2006-07-19 933 934 2016-02-19 OPUS4-14123 Beitrag zu einem Sammelband Algernon, Daniel; Schubert, F.; Wiggenhauser, Herbert Impact-Echo: Experimental and Numerical Study of Acoustic Wave Propagation St. Louis ASTM 2006 NDE Conference on Civil Engineering 1-57117-148-7 NDE Conference on Civil Engineering St. Louis, Missouri, USA 2006-08-14 2006-08-18 215 222 2016-02-19 OPUS4-14126 Beitrag zu einem Sammelband Algernon, Daniel; Wiggenhauser, Herbert Impact-Echo Signal Processing St. Louis ASTM 2006 NDE Conference on Civil Engineering 1-57117-148-7 NDE Conference on Civil Engineering St. Louis, Missouri, USA 2006-08-14 2006-08-18 207 214 2016-02-19 OPUS4-14265 Buchkapitel Streicher, Doreen; Wiggenhauser, Herbert Zustandsuntersuchungen an Spannbetonbrücken Berlin Ernst 2006 Verkehrsbauten - Flächentragwerke (Beton-Kalender 2007) 1 978-3-433-01833-0 Kap. V / Abschnitt 13 581 588 2016-02-19 OPUS4-14293 Zeitschriftenartikel Helmerich, Rosemarie; Niederleithinger, Ernst; Wiggenhauser, Herbert Toolbox with Nondestructive Testing Methods for Condition Assessment of Railway Bridges Washington, DC National Research Council 2006 Transportation research record 1943 65 73 2016-02-19 OPUS4-14274 Vortrag Wiggenhauser, Herbert The remanent-magnetism-method: non-destructive location of prestressing steel fractures in post-tensioned concrete 2006 TRB 85th Annual Meeting, Workshop Assessment of Existing PT Bridges TRB 85th Annual Meeting, Workshop Assessment of Existing PT Bridges Washington, D.C., USA 2006-01-22 2006-01-26 2016-02-19 OPUS4-14275 Vortrag Wiggenhauser, Herbert A toolbox with non-destructive testing methods for the condition assessment of railway bridges 2006 TRB 85th Annual Meeting TRB 85th Annual Meeting Washington, D.C., USA 2006-01-22 2006-01-26 2016-02-19 OPUS4-14382 Beitrag zu einem Tagungsband Beutel, R.; Reinhardt, H.-W.; Grosse, C. U.; Glaubitt, A.; Krause, Martin; Maierhofer, Christiane; Algernon, Daniel; Wiggenhauser, Herbert; Schickert, M. Performance Demonstration of Non-Destructive Testing Methods Berlin European Federation for Non-Destructive Testing Deutsche Gesellschaft für zerstörungsfreie Prüfung 2006 9th European Conference on NDT 3-931381-86-2 9th European Conference on NDT Berlin, Germany 2006-09-25 2006-09-29 1(?) 9(?) 2016-02-19 OPUS4-14326 Vortrag Wiggenhauser, Herbert Design and construction of the large concrete slab (LCS): specimen for the improvement of non-destructive testing methods 2006 TRB 85th Annual Meeting, Workshop Assessment of Existing PT Bridges TRB 85th Annual Meeting, Workshop Assessment of Existing PT Bridges Washington, D.C., USA 2006-01-22 2006-01-26 2016-02-19 OPUS4-14354 Vortrag Wiggenhauser, Herbert Research in NDT-CE at BAM Berlin 2006 Seminar NIST Seminar NIST Gaithersburg, MD, USA 2006-08-24 2016-02-19 OPUS4-14355 Vortrag Wiggenhauser, Herbert Application of the Hilbert-Huang Transform for the impact-echo data analysis 2006 TRB 85th Annual Meeting, AFF40(1) Sub-Committee Meeting TRB 85th Annual Meeting, AFF40(1) Sub-Committee Meeting Washington, D.C., USA 2006-01-22 2006-01-26 2016-02-19 OPUS4-14356 Vortrag Wiggenhauser, Herbert Foundation NDT test site Horstwalde 2006 TRB 85th Annual Meeting, AFF40 Committee Meeting TRB 85th Annual Meeting, AFF40 Committee Meeting Washington, D.C., USA 2006-01-22 2006-01-26 2016-02-19 OPUS4-14357 Vortrag Wiggenhauser, Herbert Development and combined application of NDT echo-methods for the investigation of post tensioned concrete bridges 2006 Sonderkolloquium zum 60. Geburtstag von Dr. Gerd Dobmann Sonderkolloquium zum 60. Geburtstag von Dr. Gerd Dobmann Saarbrücken, Germany 2006-11-03 2016-02-19 OPUS4-14358 Vortrag Wiggenhauser, Herbert Automated NDE of post-tensioned concrete bridges using radar, impact-echo and ultrasonic echo 2006 2006 NDE Conference on Civil Engineering 2006 NDE Conference on Civil Engineering St. Louis, MO, USA 2006-08-14 2006-08-18 2016-02-19 OPUS4-14359 Vortrag Wiggenhauser, Herbert Automated NDE of post-tensioned concrete bridges using radar, ultrasonic echo and impact-echo 2006 Colorado Concrete 2006, ACI Fall Convention, 228 Committee Meeting Colorado Concrete 2006, ACI Fall Convention, 228 Committee Meeting Denver, CO, USA 2006-11-05 2006-11-09 2016-02-19 OPUS4-14302 Vortrag Wiggenhauser, Herbert Automated NDE of post-tensioned concrete bridges using imaging echo methods 2006 International Conference on Bridges, COST 534 Meeting International Conference on Bridges, COST 534 Meeting Dubrovnik, Croatia 2006-05-21 2006-05-24 2016-02-19 OPUS4-14374 Beitrag zu einem Sammelband Wiggenhauser, Herbert Bauwerksdiagnose mit zerstörungsfreien Prüfverfahren - Einführung und neue Entwicklungen Berlin DGZfP Deutsche Gesellschaft für zerstörungsfreie Prüfung 2006 Fachtagung Bauwerksdiagnose 2006 - Praktische Anwendungen Zerstörungsfreier Prüfungen 3-931381-71-4 DGZfP-Fachtagung Bauwerksdiagnose "Praktische Anwendungen Zerstörungsfreier Prüfungen" Berlin, Deutschland 2006-02-22 2006-02-23 1 4(?) 2016-02-19 OPUS4-14378 Beitrag zu einem Tagungsband Kruschwitz, Sabine; Niederleithinger, Ernst; Wiggenhauser, Herbert Nüesch, R. Charakterisierung von Feuchte- und Salzbelastungen in Baumaterial durch Impedanzspektroskopie Karlsruhe Aedificatio Verl. 2006 Bericht vom SMG Workshop "Innovative Feuchtemessung in Forschung und Praxis" Charakterisierung von Feuchte- und Salzbelastungen in Baumaterial durch Impedanzspektroskopie Karlsruhe, Deutschland 2006-10-17 2006-10-18 185 192 2016-02-19 OPUS4-14347 Vortrag Wiggenhauser, Herbert BAM NDT-CE Stepper 2006 TRB 85th Annual Meeting TRB 85th Annual Meeting Washington, D.C., USA 2006-01-22 2006-01-26 2016-02-19 OPUS4-14367 Beitrag zu einem Sammelband Shokouhi, Parisa; Gucunski, N.; Wiggenhauser, Herbert Using Impact Echo for Nondestructive Detection of Delamination in Concrete Bridge Decks St. Louis ASTM 2006 NDE Conference on Civil Engineering 1-57117-148-7 NDE Conference on Civil Engineering St. Louis, Missouri, USA 2006-08-14 2006-08-18 285 292 2016-02-19 OPUS4-14434 Beitrag zu einem Tagungsband Algernon, Daniel; Wiggenhauser, Herbert; Schubert, F. A new approach for the investigation of geometry effects in impact-echo measurements - experimental results and numerical simulations Impact-Echo (IE) measurements on concrete structures with compact dimensions are influenced by geometry effects, i.e. reflections especially of the surface waves at the boundaries of the test object, which in fact can lead to misinterpretation of the results. In contrast to the normal reflection arrangement, in which the excitation and the measuring sensor are placed on the same side of the specimen, measurements were carried out in a transmission arrangement, where the impactor and the measuring sensor are placed opposite to each other. This serves to reduce the influence of surface waves, and to investigate further their responsibility for the existence of geometry effects. Results obtained from laboratory specimens with smooth surfaces were still seriously affected by geometry effects. Numerical simulations led to the conclusion that surface waves travel around the edges of the specimen, thus creating geometry effects even on the opposite side. Measurements on a specimen, which was cut out from a bridge structure and had irregular connecting planes between the excitation and the measurement side, proved to be remarkably less affected. In order to analyze and visualize the surface wave propagation an arrangement is used, in which the excitation is fixed at a certain point on one plane of the specimen. A transducer scans all planes of the specimen in phase with the excitation. Time slices show the instantaneous wave field on all planes of the specimen. These are compared with numerical simulations. In particular, it can be proved that surface waves indeed travel around the edges of a specimen with smooth connecting planes, thus creating geometry effects even in the transmission arrangement. Berlin European Federation for Non-Destructive Testing Deutsche Gesellschaft für zerstörungsfreie Prüfung 2006 9th European Conference on NDT 3-931381-86-2 9th European Conference on NDT Berlin, Germany 2006-09-25 2006-09-29 1 10 2016-02-19 OPUS4-14435 Buchkapitel Stoppel, Markus; Mielentz, Frank; Wiggenhauser, Herbert Automatisierung in der zerstörungsfreien Prüfung Berlin Ernst 2006 Verkehrsbauten - Flächentragwerke (Beton-Kalender 2007) 96-1 978-3-433-01833-0 Kap. V / Abschnitt 10 562 567 2016-02-19 OPUS4-14397 Beitrag zu einem Tagungsband Streicher, Doreen; Algernon, Daniel; Wöstmann, Jens; Behrens, Matthias; Wiggenhauser, Herbert Automated NDE of post-tensioned concrete bridges using imaging echo methods Darmstadt Freunde des Instituts für Massivbau der Technischen Universität Darmstadt 2006 Tagungsband des 29. Darmstädter Massivbauseminar, "Sicherheitsgewinn durch Monitoring?" 29. Darmstädter Massivbauseminar, "Sicherheitsgewinn durch Monitoring?" Darmstadt, Germany 2006-09-14 2006-09-15 477 487 2016-02-19 OPUS4-14454 Vortrag Wiggenhauser, Herbert Development and combined application of NDT echo-methods for the investigation of post tensioned concrete bridges 2006 IABMAS'06 - Third International Conference on Bridge Maintenance, Safety and Management IABMAS'06 - Third International Conference on Bridge Maintenance, Safety and Management Oporto, Portugal 2006-07-16 2006-07-19 2016-02-19 OPUS4-14415 Vortrag Wiggenhauser, Herbert Bauwerksdiagnose mit zerstörungsfreien Prüfverfahren - Einführung und neue Entwicklungen 2006 Bauwerksdiagnose 2006 Bauwerksdiagnose 2006 Berlin, Germany 2006-02-23 2006-02-24 2016-02-19 OPUS4-14416 Vortrag Wiggenhauser, Herbert Automated NDE of post-tensioned concrete bridges using imaging echo methods 2006 29. Darmstädter Massivbauseminar "Sicherheitsgewinn durch Monitoring?" an der TU Darmstadt 29. Darmstädter Massivbauseminar "Sicherheitsgewinn durch Monitoring?" an der TU Darmstadt Darmstadt, Germany 2006-09-14 2006-09-15 2016-02-19 OPUS4-14562 Forschungsbericht Holst, R.; Streicher, Doreen; Gardei, André; Kohl, Christoph; Wöstmann, Jens; Wiggenhauser, Herbert Scannende Verfahren der zerstörungsfreien Prüfung für Brückenbauwerke Die Bauwerke der Bundesfernstraßen (Brücken, Tunnel, Lärmschutzwände) sind gemäß DIN 1076 regelmäßig zu überprüfen. Bei der alle sechs Jahre stattfindenden Hauptprüfung sind diese Bauwerke handnah zu untersuchen und die Schäden nach Standsicherheit, Verkehrssicherheit und Dauerhaftigkeit zu bewerten. Allerdings lassen sich versteckte Schäden beziehungsweise Ursachen von sichtbaren Schäden nicht immer erkennen. Aus diesem Grund sind in den vergangenen Jahren verstärkt Anstrengungen auf dem Gebiet der zerstörungsfreien Prüfverfahren (ZfP) im Bauwesen unternommen worden. Hierbei haben die Verfahren Radar, Impact-Echo und Ultraschall ihre prinzipielle Einsatzfähigkeit zur Schadenserkundung beziehungsweise -bewertung bewiesen. Allerdings haben die einzelnen Verfahren ihre bestimmten Einsatzgrenzen beziehungsweise Randbedingungen, die zu beachten sind. Zudem ist der Einsatz dieser Verfahren zur Untersuchung größerer Flächen sehr zeit- und personalintensiv und erzeugt zurzeit noch nicht unerhebliche Kosten. Aus diesem Grund hat die Bundesanstalt für Materialforschung und -prüfung einen Baustellenscanner entwickelt, der es ermöglicht, automatisiert eine größere Fläche eines Bauwerks mit den oben genannten Verfahren der ZfP zu untersuchen. Zur Untersuchung eines Bauwerks vor Ort wurde die Fuldatalbrücke Eichenzell gewählt, die im Zuge des Ausbaus der Bundesstraße zur Autobahn A 66 abzureißen war. Mit Unterstützung der Hessischen Straßenbauverwaltung und hierbei speziell des ASV Fulda wurden Untersuchungen mit Radar, Impact-Echo und Ultraschall an der Fahrbahnplatte von oben beziehungsweise von unten sowie an der Innenseite des Hohlkastensteges durchgeführt. Der Baustellenscanner und die einzelnen Verfahren konnten praxisnah erprobt und ihre Eignung nachgewiesen werden. Ein großer Vorteil der automatisierten Untersuchung eines Bauwerkes mit verschiedenen Verfahren liegt darin, dass die Messung bei den einzelnen Verfahren auf den gleichen Messpunkten erfolgt und somit eine Datenüberlagerung möglich ist. Mit Hilfe spezieller Auswerte- beziehungsweise Überlagerungssoftware konnte eine Datenfusion erreicht werden, die die Vorteile der einzelnen Verfahren zur besseren Untersuchung des Bauwerkes nutzen konnte. Bremerhaven Wirtschaftsverl. NW, Verl. für neue Wissenschaft 2006 Berichte der Bundesanstalt für Strassenwesen - Brücken- und Ingenieurbau (B) 48 1 68 2016-02-19 OPUS4-14724 Vortrag Wiggenhauser, Herbert Need for non-destructive testing and evaluation of concrete structures, advanced NDT methods and damage assessment in concrete structures - Part I and II 2007 Advanced course on non-destructive testing and evaluation of concrete structures, SERC Advanced course on non-destructive testing and evaluation of concrete structures, SERC Chennai, India 2007-01-17 2007-01-19 2016-02-19 OPUS4-14725 Vortrag Wiggenhauser, Herbert Need for non-destructive testing and evaluation of concrete structures. Advanced NDT methods and damage assessment in concrete structures 2007 CBRI Seminar CBRI Seminar Roorkee, India 2007-02-05 2007-02-06 2016-02-19 OPUS4-14726 Vortrag Wiggenhauser, Herbert Advanced NDT methods and damage assessment in concrete structures 2007 IGCAR IGCAR Kalpakkam, India 2007-02-15 2016-02-19 OPUS4-14727 Vortrag Wiggenhauser, Herbert Infrared thermography application in NDT of concrete 2007 Advanced course on Non-Destructive Testing and evaluation of concrete structures, SERC Advanced course on Non-Destructive Testing and evaluation of concrete structures, SERC Chennai, India 2007-01-11 2016-02-19 OPUS4-14728 Vortrag Wiggenhauser, Herbert Ground penetrating radar, applications in civil engineering 2007 Advanced course on non-destructive testing and evaluation of concrete structures, SERC Advanced course on non-destructive testing and evaluation of concrete structures, SERC Chennai, India 2007-01-04 2016-02-19 OPUS4-14729 Vortrag Wiggenhauser, Herbert Improvement and Validation of Foundation NDT Methods 2007 Advanced Course on Non-Destructive Testing and Evaluation of Concrete Structure, SERC Advanced Course on Non-Destructive Testing and Evaluation of Concrete Structure, SERC Chennai, India 2007-01-25 2016-02-19 OPUS4-14730 Vortrag Wiggenhauser, Herbert Research in non-destructive testing in civil engineering at BAM 2007 Concrete Platform 2007 Concrete Platform 2007 Belfast, Northern Ireland 2007-04-19 2007-04-20 2016-02-19 OPUS4-14731 Vortrag Wiggenhauser, Herbert ZfPBau-Compendium in the Internet 2006 Advanced Course on Non-Destructive Testing and Evaluation of Concrete Structures, SERC Advanced Course on Non-Destructive Testing and Evaluation of Concrete Structures, SERC Chennai, India 2006-12-07 2016-02-19 OPUS4-14732 Vortrag Wiggenhauser, Herbert Impact-echo: theory, application and improvements 2006 Advanced Course on Non-Destructive Testing and Evaluation of Concrete Structures, SERC Advanced Course on Non-Destructive Testing and Evaluation of Concrete Structures, SERC Chennai, India 2006-12-14 2016-02-19 OPUS4-14733 Vortrag Wiggenhauser, Herbert Imaging ultrasonic pulse echo for concrete 2006 Advanced Course on Non-Destructive Testing and Evaluation of Concrete Structures, SERC Advanced Course on Non-Destructive Testing and Evaluation of Concrete Structures, SERC Chennai, India 2006-12-21 2016-02-19 OPUS4-14734 Vortrag Wiggenhauser, Herbert Bridge testing using combined NDT methods 2006 Advanced Course on Non-Destructive Testing and Evaluation of Concrete Structures, SERC Advanced Course on Non-Destructive Testing and Evaluation of Concrete Structures, SERC Chennai, India 2006-12-28 2016-02-19 OPUS4-14753 Beitrag zu einem Sammelband Wiggenhauser, Herbert Advanced NDT methods and damage assessment in concrete structures - Part I Chennai Allied Publishers Private Limited 2007 Proceedings of the Advanced Course on Non-Destructive Testing and Evaluation of Concrete Structures 81-8424-153-4 Advanced Course on Non-Destructive Testing and Evaluation of Concrete Structures Chennai, India 2007-01-17 2007-01-19 L4.1 L4.4 2016-02-19 OPUS4-14755 Beitrag zu einem Sammelband Wiggenhauser, Herbert Need for Non-Destructive Testing and Evaluation of Concrete Structures Chennai Allied Publishers Private Limited 2007 Proceedings of the Advanced Course on Non-Destructive Testing and Evaluation of Concrete Structures 81-8424-153-4 Advanced Course on Non-Destructive Testing and Evaluation of Concrete Structures Chennai, India 2007-01-17 2007-01-19 L1.1 L1.12 2016-02-19 OPUS4-14756 Beitrag zu einem Sammelband Wiggenhauser, Herbert Advanced NDT methods and damage assessment in concrete structures - Part II Chennai Allied Publishers Private Limited 2007 Proceedings of the Advanced Course on Non-Destructive Testing and Evaluation of Concrete Structures 81-8424-153-4 Advanced Course on Non-Destructive Testing and Evaluation of Concrete Structures, Chennai, India 2007-01-17 2007-01-19 L5.1 L5.20 2016-02-19 OPUS4-14805 Beitrag zu einem Tagungsband Wiggenhauser, Herbert; Krause, Martin; Maierhofer, Christiane; Algernon, Daniel; Gardei, André; Gräfe, Boris; Kohl, Christoph; Lausch, Regine; Mielentz, Frank; Milmann, Boris; Streicher, Doreen; Zacher, Gerhard Grundlagen kombinierter zerstörungsfreier Prüfverfahren zur Untersuchung von Betonbauteilen Berlin BAM 2007 Bericht vom Forschergruppe 384 Abschlusskolloquium Forschergruppe 384 Abschlusskolloquium Bergisch Gladbach, Deutschland 2007-05-03 23 44 2016-02-19 OPUS4-14792 Beitrag zu einem Tagungsband Wiggenhauser, Herbert; Streicher, Doreen; Algernon, Daniel; Wöstmann, Jens; Behrens, Matthias Russel, M.; Basheer, P. Automated application and combination of non-destructive echo methods for the investigation of post-tensioned concrete bridges Belfast Queen's University of Belfast 2007 Proceedings of Concrete Platform 978-0-85389-913-6 Concrete Platform Belfast, Großbritannien, Northern Ireland 2005-04-19 2005-04-20 261 269 2016-02-19 OPUS4-14766 Vortrag Wiggenhauser, Herbert A European research project for the condition assessment of railway bridges, on-site investigation techniques for the structural evaluation of historic masonry buildings 2007 Advanced Course on Non-Destructive Testing and Evaluation of Concrete Structures Advanced Course on Non-Destructive Testing and Evaluation of Concrete Structures Chennai, India 2007-02-15 2016-02-19 OPUS4-14783 Beitrag zu einem Tagungsband Wiggenhauser, Herbert Russel, M.; Basheer, P. Research in non-destructive testing in Civil Engineering at BAM Belfast Queen's University of Belfast 2007 Proceedings of Concrete Platform 978-0-85389-913-6 Concrete Platform Belfast, UK, Northern Ireland 51 63 2016-02-19 OPUS4-14789 Vortrag Wiggenhauser, Herbert Automatisierte Anwendung an ausgewählten Beispielen 2007 Abschlusskolloquium der DFG-Forschergruppe FOR 384 an der Bundesanstalt für Straßenwesen (BASt) Abschlusskolloquium der DFG-Forschergruppe FOR 384 an der Bundesanstalt für Straßenwesen (BASt) Bergisch Gladbach, Germany 2007-05-03 2016-02-19 OPUS4-14773 Vortrag Wiggenhauser, Herbert Automated application and combination of non-destructive echo methods for the investigation of post-tensioned concrete bridges 2007 Concrete Platform 2007 Concrete Platform 2007 Belfast, Northern Ireland 2007-04-19 2007-04-20 2016-02-19 OPUS4-4909 Beitrag zu einem Tagungsband Maierhofer, Christiane; Krause, Martin; Mielentz, Frank; Streicher, Doreen; Milmann, Boris; Gardei, André; Kohl, Christoph; Wiggenhauser, Herbert Complementary application of radar, impact-echo and ultrasonics for testing concrete structures and metallic tendon ducts Washington 2004 Proceedings of the 83rd Annual Meeting Transportation Research Board of the National Academies 83rd Annual Meeting Transportation Research Board of the National Academies Washington, D. C., USA 2004-01-11 2004-01-15 18 pages 2016-02-19 OPUS4-6900 Vortrag Wiggenhauser, Herbert Automated Non-Destructive Testing of Highway Bridges with Radar, Ultrasonic and Impact-Echo 2005 Transportation Research Board of the National Academies, 83rd Annual Meeting 2005 Transportation Research Board of the National Academies, 83rd Annual Meeting 2005 Washington, D.C., USA 2005-01-13 2016-02-19 OPUS4-12159 Beitrag zu einem Sammelband Streicher, Doreen; Algernon, Daniel; Behrens, Matthias; Wöstmann, Jens; Wiggenhauser, Herbert; Petz, J. Zerstörungsfreie Zustandsuntersuchungen an Spannbetonbrücken unter Verkehr Berlin DGZfP Deutsche Gesellschaft für zerstörungsfreie Prüfung 2006 Fachtagung Bauwerksdiagnose 2006 - Praktische Anwendungen Zerstörungsfreier Prüfungen 3-931381-71-4 DGZfP-Fachtagung Bauwerksdiagnose "Praktische Anwendungen Zerstörungsfreier Prüfungen" Berlin, Deutschland 2006-02-22 2006-02-23 237 244 2016-02-19 OPUS4-7366 Beitrag zu einem Tagungsband Große, C.; Wiggenhauser, Herbert; Algernon, Daniel; Schubert, F.; Beutel, R. Impact-Echo - Stand der Technik und Anwendungen des Verfahrens Berlin BAM 2005 Tagungsband der DAfStb-Fachtagung 2005 DAfStb-Fachtagung 2005 "Zerstörungsfreie Prüfverfahren und Bauwerksdiagnose im Betonbau" Berlin, Deutschland 2005-03-10 2005-03-11 1 8 2016-02-19 OPUS4-7368 Zeitschriftenartikel Wiggenhauser, Herbert Radar, Ultraschall und Impakt-Echo als zerstörungsfreie Prüfverfahren - Bewehrungssuche, -überdeckung und Hüllrohruntersuchungen Berlin Ernst 2005 Beton- und Stahlbetonbau 100 1 A6 2016-02-19 OPUS4-7307 Zeitschriftenartikel Streicher, Doreen; Wiggenhauser, Herbert; Holst, R.; Haardt, P. Zerstörungsfreie Prüfung im Bauwesen - Automatisierte Messungen mit Radar, Ultraschallecho und Impact-Echo an der Fuldatalbrücke Die Standsicherheit und Dauerhaftigkeit von Spannbetonbrücken werden wesentlich durch den Ist-Zustand der Bewehrung und der Spannglieder bestimmt. Bei komplexeren Schadensbildern oder dem Verdacht visuell nicht erkennbarer Schäden sind zur Zustandsbeurteilung detaillierte Informationen über deren Art und Umfang durch Objektbezogene Schadensanalysen zu erheben. Die Anzahl der dazu zu öffnenden Untersuchungsstellen kann durch den Einsatz zerstörungsfreier Prüfverfahren (ZfPBau-Verfahren) deutlich reduziert werden. Die Leistungsfähigkeit der automatisierten ZfPBau-Verfahren - Radar, Ultraschallecho und Impact-Echo - für die Ortung von Bewehrung, internen Spanngliedern und gegebenenfalls vorhandenen Verpreßfehlern wird anhand von Messungen an der Fuldatalbrücke bei Eichenzell gezeigt. Die Ergebnisse der Untersuchungen werden bildgebend dargestellt. Berlin Ernst 2005 Beton- und Stahlbetonbau 100 3 216 224 10.1002/best.200590053 2016-02-19 OPUS4-7333 Zeitschriftenartikel Wiggenhauser, Herbert Bewehrungssuche, -überdeckung und Hüllrohruntersuchungen: Radar, Ultraschall und Impakt-Echo als zerstörungsfreie Prüfverfahren Gütersloh Bauverl. BV Bundesverband Deutsche Beton- und Fertigteilindustrie 2005 Betonwerk + Fertigteil-Technik 71 49. Ulmer Beton- und Fertigteiltage "Faszination Beton" Neu-Ulm, Deutschland 2005-02-15 2005-02-17 2 180 181 2016-02-19 OPUS4-7335 Zeitschriftenartikel Tinkey, Y.; Olson, L.D.; Wiggenhauser, Herbert Impact Echo Scanning for Discontinuity Detection and Imaging in Posttensioned Concrete Bridges and Other Structures Columbus, Ohio Society for Nondestructive Testing 2005 Materials evaluation 63 1 64 69 2016-02-19 OPUS4-7315 Vortrag Wiggenhauser, Herbert Bewehrungssuche, -überdeckung und Hüllrohruntersuchungen: Radar, Ultraschall und Impakt-Echo als zerstörungsfreie Prüfverfahren 2005 49. Ulmer Beton- und Fertigteiltage, Edwin-Scharff-Haus 49. Ulmer Beton- und Fertigteiltage, Edwin-Scharff-Haus Neu-Ulm, Germany 2005-02-15 2005-02-17 2016-02-19 OPUS4-7316 Vortrag Wiggenhauser, Herbert Non-destructive evaluation of concrete structures using acoustic and electromagnetic methods 2005 Transportation Research Board of the National Academies, 83rd Annual Meeting 2005 Transportation Research Board of the National Academies, 83rd Annual Meeting 2005 Washington, D.C., USA 2005-01-12 2016-02-19 OPUS4-7355 Vortrag Wiggenhauser, Herbert The NDT-Compendium in the Internet 2005 Transportation Research Board of the National Academies, 83rd Annual Meeting 2005, Committee AFF40 Transportation Research Board of the National Academies, 83rd Annual Meeting 2005, Committee AFF40 Washington, D.C., USA 2005-01-11 2016-02-19 OPUS4-7361 Vortrag Wiggenhauser, Herbert Sustainable Bridges 2005 Transportation Research Board of the National Academies, 83rd Annual Meeting 2005 Transportation Research Board of the National Academies, 83rd Annual Meeting 2005 Washington, D.C., USA 2005-01-11 2016-02-19 OPUS4-10496 Vortrag Wiggenhauser, Herbert Assessment of Post Tensioned Concrete Bridges Applying Automated Non-Destructive Testing Systems 2005 I. Munich Bridge Assessment Conference MBAC an der Universität der Bundeswehr München I. Munich Bridge Assessment Conference MBAC an der Universität der Bundeswehr München Munich, Germany 2005-06-20 2005-06-25 2016-02-19 OPUS4-11711 Beitrag zu einem Sammelband Algernon, Daniel; Wiggenhauser, Herbert Mazal, P. Identification of short transient signals within impact-echo data using the Hilbert-Huang-Transform Brno Univ. of Technology Czech Society for Non-Destructive Testing 2005 NDT in progress : IIIrd International Workshop of NDT Experts, October 10 - 12, 2005, Prague, Czech Republic, Proceedings 80-2142996-8 3rd International Workshop of NDT Experts Prague, Czech Republic 2005-10-10 2005-10-12 9 17 2016-02-19 OPUS4-12408 Beitrag zu einem Sammelband Taffe, Alexander; Wiggenhauser, Herbert Validierung von ZfP-Verfahren im Bauwesen Berlin DGZfP Deutsche Gesellschaft für zerstörungsfreie Prüfung 2006 Fachtagung Bauwerksdiagnose 2006 - Praktische Anwendungen Zerstörungsfreier Prüfungen 3-931381-71-4 DGZfP-Fachtagung Bauwerksdiagnose "Praktische Anwendungen Zerstörungsfreier Prüfungen" Berlin, Deutschland 2006-02-22 2006-02-23 1(?) 9(?) 2016-02-19 OPUS4-13942 Beitrag zu einem Sammelband Streicher, Doreen; Algernon, Daniel; Wöstmann, Jens; Behrens, Matthias; Wiggenhauser, Herbert Automated NDE of post-tensioned concrete bridges using radar, ultrasonic echo and impact-echo St. Louis ASTM 2006 NDE Conference on Civil Engineering 1-57117-148-7 NDE Conference on Civil Engineering St. Louis, Missouri, USA 2006-08-14 2006-08-18 439 444 2016-02-19 OPUS4-18603 Zeitschriftenartikel Taffe, Alexander; Wiggenhauser, Herbert; Raupach, M. Validierung zerstörungsfreier Prüfverfahren im Bauwesen Die Validierung dient bereits in vielen Bereichen der Technik zum Nachweis, ob mit einem Verfahren Kundenanforderungen erfüllt werden können. Da gerade die im Bauwesen verwendeten zerstörungsfreien Prüfverfahren bis auf den Rückprallhammer nicht in einer deutschen Norm geregelt sind, kann die Validierung zur verbesserten Anwendungssicherheit nicht genormter Verfahren beitragen. Die Leistungsfähigkeit des Verfahrens wird für den Kunden transparent, so dass er die Güte der Messergebnisse einschätzen kann. Das ist besonders dann von Bedeutung, wenn aus dem Messergebnis eine belastbare Aussage abgeleitet werden soll und hohe Anforderungen bezüglich der Messgenauigkeit bestehen. So entsteht z. B. die Frage, welche Bauteildicke nach zerstörungsfreien Untersuchungen für eine statische Nachrechnung auf einem bestimmten Vertrauensniveau angesetzt werden kann oder mit welcher Sicherheit Pfahlgründungen, deren Länge ebenfalls zerstörungsfrei bestimmt wurde, in eine tragende Schicht einbinden. In dem Beitrag werden die Grundzüge der Durchführung einer Validierung beschrieben und am Beispiel der Dickenmessung an Fundamenten erläutert. Die beschriebene Vorgehensweise kann prinzipiell auf eine Vielzahl im Bauwesen auftretender Prüfaufgaben angewandt werden. Sind die Anforderungen an die Prüfaufgabe bezüglich der Genauigkeit nicht so hoch, können vereinfachte Abschätzungen der Messunsicherheit vorgenommen werden. Berlin Ernst 2008 Beton- und Stahlbetonbau 103 12 828 836 10.1002/best.200800649 2016-02-19 OPUS4-18604 Zeitschriftenartikel Taffe, Alexander; Wiggenhauser, Herbert Zerstörungsfreie Zustandsermittlung und Qualitätssicherung in der Betoninstandsetzung Berlin Ernst 2008 Beton- und Stahlbetonbau 103 Dezember Spezial "Betonerhaltung" 1 13 10.1002/best.200810201 2016-02-19 OPUS4-29348 Vortrag Wiggenhauser, Herbert State-of-the-Art of Non-Destructive Testing Methods and Technologies for Nuclear Power Plant Safety-Related Concrete Structures 2013 Workshop on Non-Destructive Evaluation of Thick Walled Concrete Structures Workshop on Non-Destructive Evaluation of Thick Walled Concrete Structures Prague, Czech Republic 2013-09-17 2013-09-19 2016-02-20 OPUS4-29349 Vortrag Wiggenhauser, Herbert State-of-the-Art of Non-Destructive Testing Methods and Technologies for Nuclear Power Plant Safety-Related Concrete Structures 2013 40th Annual Review of Progress in Quantitative Nondestructive Evaluation (QNDE) 2014 40th Annual Review of Progress in Quantitative Nondestructive Evaluation (QNDE) 2014 Baltimore, MD, USA 2013-07-21 2013-07-26 2016-02-20 OPUS4-29351 Vortrag Wiggenhauser, Herbert Innovative Ultrasonic Techniques for Inspection and Monitoring of Large Concrete Structures 2013 ESV Euridice Meeting, EIG Euridice ESV Euridice Meeting, EIG Euridice Mol, Belgium 2013-01-28 2013-01-28 2016-02-20 OPUS4-29352 Vortrag Wiggenhauser, Herbert Signal Analysis and Data Fusion of Multi Sensor NDE of Concrete 2013 Transportation Research Board (TRB), 92nd Annual Meeting Transportation Research Board (TRB), 92nd Annual Meeting Washington, D.C., USA 2013-01-13 2013-01-17 2016-02-20 OPUS4-29353 Vortrag Wiggenhauser, Herbert Operational Capability of RFID-based Sensor Systems for Concrete Structures 2013 Transportation Research Board (TRB), 92nd Annual Meeting Transportation Research Board (TRB), 92nd Annual Meeting Washington, D.C., USA 2013-01-13 2013-01-17 2016-02-20 OPUS4-29354 Vortrag Wiggenhauser, Herbert GPR-based Corrosion Detection 2013 Transportation Research Board (TRB), 92nd Annual Meeting Transportation Research Board (TRB), 92nd Annual Meeting Washington, D.C., USA 2013-01-13 2013-01-17 2016-02-20 OPUS4-29355 Vortrag Wiggenhauser, Herbert Embedded Sensors 2013 Transportation Research Board (TRB), 92nd Annual Meeting Transportation Research Board (TRB), 92nd Annual Meeting Washington, D.C., USA 2013-01-13 2013-01-17 2016-02-20 OPUS4-29356 Vortrag Wiggenhauser, Herbert Fast Quantitative LIBS Analysis of Concrete with High Spatial Resolution 2013 Transportation Research Board (TRB), 92nd Annual Meeting Transportation Research Board (TRB), 92nd Annual Meeting Washington, D.C., USA 2013-01-13 2013-01-17 2016-02-20 OPUS4-29357 Vortrag Wiggenhauser, Herbert Testwall for Tendon Duct Inspection 2013 Transportation Research Board (TRB), 92nd Annual Meeting Transportation Research Board (TRB), 92nd Annual Meeting Washington, D.C., USA 2013-01-13 2013-01-17 2016-02-20 OPUS4-29051 Zeitschriftenartikel Wiggenhauser, Herbert; Niederleithinger, Ernst Innovative ultrasonic techniques for inspection and monitoring of large concrete structures Ultrasonic echo and transmission techniques are used in civil engineering on a regular basis. New sensors and data processing techniques have lead to many new applications in the structural investigation as well as quality control. But concrete structures in the nuclear sector have special features and parameters, which pose problems for the methods and instrumentation currently available, e.g. extreme thickness, dense reinforcement, steel liners or special materials. Several innovative ultrasonic techniques have been developed to deal with these issues at least partly in lab experiments and pilot studies. Modern imaging techniques as multi-offset SAFT have been used e. g. to map delaminations. Thick concrete walls have successfully been inspected, partly through a steel liner. Embedded ultrasonic sensors have been designed which will be used in monitoring networks of large concrete structures above and below ground. In addition, sensitive mathematical methods as coda wave interferometry have been successfully evaluated to detect subtle changes in material properties. Examples of measurements and data evaluation are presented. Les Ulis EDP Sciences 2013 The European physical journal - Web of Conferences : proceedings 56 04004-1 04004-9 urn:nbn:de:kobv:b43-290513 10.1051/epjconf/20135604004 http://creativecommons.org/licenses/by/3.0/de/deed.de 2016-02-20 OPUS4-29513 Vortrag Wiggenhauser, Herbert Research in Non-destructive Testing in Civil Engineering at BAM 2013 Polytechnic School Seminar, University of Sao Paulo Polytechnic School Seminar, University of Sao Paulo São Paulo, Brazil 2013-11-07 2013-11-07 2016-02-20 OPUS4-29514 Vortrag Wiggenhauser, Herbert Research in Non-destructive Testing in Civil Engineering at BAM 2013 Seminar, ipt Instituto Pesquisas Technologicas Seminar, ipt Instituto Pesquisas Technologicas São Paulo, Brazil 2013-11-06 2013-11-06 2016-02-20 OPUS4-29642 Beitrag zu einem Tagungsband Wolf, Julia; Milmann, Boris; Helmerich, Rosemarie; Köpp, Christian; Mielentz, Frank; Wiggenhauser, Herbert; Kurz, J.H.; Moryson, R.-M.; Samokrutov, A.; Alekhin, S. G.; Alver, Ninel; Sazak, H.-Ö. Xu, Y. L.; Zhu, S.; Xia, Y.; Ni, Y.Q.; Law, S.S.; Yin, J. H.; Su, Z.Q. Ultrasound based monitoring system for concrete monolithic objects Ultrasound sensors should be embedded into concrete for monitoring concrete properties. These new longitudinal wave sensors with a center frequency of 60 kHz were examined regarding their suitability for ultrasonic measurements in concrete structures in terms of emission characteristics, sensitivity and frequency ränge. For the measurement of the radiation patterns, the sensors were embedded vertically and horizontally in concrete cylinders. The directivity pattern was measured using a laser vibrometer. The sensitivity of the sensor was determined in water using different sensors of the same type. It shows changes in the signal amplitude as well as variations in the frequency ränge for different transmitter-receiver combinations. The attenuation of the concrete affects the achievable resolution of the measurements and thus, the maximum possible spacing of the sensors within a concrete element. Experimental tests helped optimizing the distances with respect to the required resolution and the effort of embedding the sensors. The signal attenuation in the concrete was measured in the frequency ränge of 60 kHz in response to various degrees of reinforcement and grain size. For this purpose, the sensors were cast at different distances in the specimens studied. The recorded Signals were evaluated for their amplitude and frequency spectrum. International society for structural health monitoring of intelligent infrastructure 2013 SHMII-6 - 6th International conference on structural health monitoring of intelligent infrastructure (Proceedings) 978-962-367-768-4 SHMII-6 - 6th International conference on structural health monitoring of intelligent infrastructure Hong Kong, China 09.12.2013 11.12.2013 1 6 2016-02-20 OPUS4-18655 Beitrag zu einem Tagungsband Helmerich, Rosemarie; Wiggenhauser, Herbert Non-destructive testing of concrete structures 2008 ICAMEM2008 - 4th International Conference on Advances in Mechanical Engineering and Mechanics (Proceedings) 4th International Conference on Advances in Mechanical Engineering and Mechanics (ICAMEM2008) Sousse, Tunisia 2008-12-16 2008-12-18 1 10 2016-02-19 OPUS4-22699 Forschungsbericht Müller, H. S.; Fenchel, M.; Wiggenhauser, Herbert; Maierhofer, Christiane; Krause, Martin; Gardei, André; Mielentz, Frank; Milmann, Boris; Röllig, Mathias; Wöstmann, Jens Zerstörungsfreie Ortung von Gefügestörungen in Betonbodenplatten Das Ziel des Forschungsvorhabens „Zerstörungsfreie Ortung von Gefügestörungen in Betonbodenplatten" bestand in der Entwicklung eines Untersuchungskonzepts zur sicheren Ortung und Erfassung von Gefügestörungen in einseitig zugänglichen Betonplatten durch den kombinierten Einsatz verschiedener zerstörungsfreier Prüfverfahren. Hierfür wurde die Leistungsfähigkeit der folgenden Messverfahren hinsichtlich ihrer Aussageschärfe, Anwendungsgrenzen und Messgeschwindigkeit bei praxisnahen Randbedingungen untersucht: - Impakt-Echo, manuelle Impaktauslösung - Impakt-Echo, automatisierte Impaktauslösung - Ultraschall-Echo mit multistatischem Array - Impuls-Thermografie - Radar Als Versuchskörper dienten sechs liegend hergestellte Betonplatten der Abmessungen 200/200/30 cm aus zwei verschiedenen Betongüten und mit unterschiedlichem Bewehrungsgehalt (Bewehrungsgrade 0 %, 0 ,9 %, 2 ,6 %), von denen vier Platten auf trockenem und zwei Platten auf ständig nass gehaltenem Sand gelagert waren. Alle sechs Platten enthielten jeweils dieselben künstlich eingebrachten Fehlstellen: vier quadratische Kiesnester in unterschiedlicher Tiefe mit Kantenlängen zwischen 10 und 15 cm sowie drei oberflächennahe Hohlstellen (Ø 4/6/8 cm). Zur Erfassung eines möglichen Einflusses des Betonalters wurden die Messungen 4 Tage, 28 Tage sowie 180 Tage nach Herstellung der Platten durchgeführt. Um aus den Untersuchungen einen breiten Nutzen für die Praxis zu erzielen, basierten die eingesetzten Messverfahren auf handelsüblichen Geräten, welche jedoch bezüglich ihres Messprinzips und insbesondere der Datenerfassung und -auswertung weiterentwickelt wurden. Die Fehlstellengröße wurde bewusst klein gewählt. Mit Ausnahme des manuellen Impakt-Echo-Verfahrens, mit welchem unter Verwendung der Originalsoftware des Herstellers keine Fehlstellen nachweisbar waren, zeigten sich alle Messverfahren geeignet, unter verschiedenen Randbedingungen Gefügestörungen zu lokalisieren. Insgesamt wurde jeder Fehlstellentyp von zumindest einem Verfahren bei mindestens zwei Versuchskörpern detektiert. Es konnten jedoch an keiner Betonplatte mit einem einzelnen Messverfahren alle vorhandenen Fehlstellen an allen Messterminen geortet werden. Am häufigsten wurden die beiden großen oberflächennahen Fehlstellen (Hohlstelle Ø 8 cm, Kiesnest 10 cm) erkannt. Am schwersten zu lokalisieren waren die kleine Hohlstelle mit 4 cm Durchmesser sowie die beiden auf der Unterseite gelegenen Kiesnester. Die Untersuchungen zeigen, dass für eine erfolgreiche Anwendung zerstörungsfreier Messverfahren in der Praxis die Auswahl des am besten geeigneten Verfahrens bzw. einer Kombination verschiedener Verfahren jeweils auf die vorliegende Problemstellung abgestimmt sein muss. Für Betonbodenplatten mit hohem Feuchtegehalt (junger Beton) oder starker Bewehrung ist entweder das Ultraschall- oder das Impakt-Echo-Verfahren geeignet. Das Ultraschall-Verfahren wird von hohen Bewehrungsgehalten zwar stärker beeinflusst als das Impakt-Echo-Verfahren, besitzt aber eine bessere Auflösung und ermöglicht auch im oberflächennahen Bereich eine quantitative Bestimmung der Fehlstellentiefe. Das Impakt-Echo-Verfahren kann wegen der niederfrequenten Impulsanregung Fehlstellen erst in größeren Tiefen und mit schlechterer Auflösung nachweisen, ist aber ideal geeignet zur Bestimmung der Plattendicke aufgrund seines signifikanten Rückwandechos. Sowohl das Radar-Verfahren als auch die Impuls-Thermografie können bei hohen Feuchte- und Bewehrungsgehalten nur sehr oberflächennah eingesetzt werden. Bei trockenem Beton und geringen bis mittleren Bewehrungsgehalten liefert das Radar-Verfahren sehr gute Ergebnisse. In kurzer Zeit ermöglicht es eine flächendeckende Ortung der Tiefenlage und Größe von Inhomogenitäten bei guter Auflösungsgenauigkeit. Vorhandene Bewehrung wird deutlich abgebildet, kann aber darunterliegende Fehlstellen verschatten. Alternativ kann die Impuls-Thermografie für die Ortung oberflächennaher Gefügestörungen eingesetzt werden. Das Verfahren eignet sich insbesondere bei Oberflächen, die nicht direkt zugänglich sind, da zwischen Infrarotkamera und Messobjekt nur Sichtkontakt bestehen muss. Die Betongüte hatte bei keinem eingesetzten Verfahren einen erkennbaren Einfluss auf die Messergebnisse. Streng genommen ist dies jedoch nur für den Einfluss des Wasserzementwertes, der Zementart und des Zementgehalts bei gleichbleibender Sieblinie und gleicher Kornart gültig. Bei Verwendung von Leichtzuschlag sind abweichende Ergebnisse denkbar. Berlin Beuth Deutscher Ausschuss für Stahlbeton 2010 DAfStb-Hefte 978-3-410-65075-1 589 1 88 2016-02-19 OPUS4-20651 Beitrag zu einem Tagungsband Krause, Martin; Gräfe, Boris; Mielentz, Frank; Milmann, Boris; Friese, Martin; Wiggenhauser, Herbert; Mayer, K. M.G. Alexander, ; H.-D. Beushausen, ; F. Dehn, ; P. Moyo, Ultrasonic imaging of post-tensioned concrete elements: New techniques for reliable localization of grouting defects Boca Raton CRC Press 2009 Proceedings of the international conference on concrete repair, rehabilitation and retrofitting II 978-0-415-46850-3 2nd International Conference on Concrete Repair, Rehabilitation and Retrofitting Cape Town, South Africa 2008-11-24 2008-11-26 521 527 2016-02-19 OPUS4-20789 Beitrag zu einem Sammelband Wiggenhauser, Herbert Odile Abraham, ; Dérobert, Xavier Advanced NDT methods for quality assurance of concrete structures Laboratoire Central des Ponts et Chaussées 2009 NDTCE `09 - 7th international symposium on non destructive testing in civil engineering (Proceedings) 978-2-7208-2542-5 NDTCE `09 - 7th international symposium on non destructive testing in civil engineering Nantes, France 2009-06-30 2009-07-03 Paper 77 1 12 2016-02-19 OPUS4-20790 Zeitschriftenartikel Algernon, Daniel; Wiggenhauser, Herbert Impact echo data analysis based on Hilbert-Huang transform Impact echo is an acoustic method based on the use of transient stress waves generated by an elastic impact; it is used for nondestructive testing of concrete structures. In practical applications, the signals obtained often are superimposed by further mechanical vibrations and the so-called geometry effects, which are caused mainly by surface waves. Because of attenuation in the concrete as well as the divergence of the acoustical waves, impact echo signals are transient. As a result, the frequency content changes over time. Normally the analysis is carried out on the Fourier power spectrum of the signal. However, the Fourier spectrum is still affected by the mentioned effects and has well-known deficiencies for short transient signals within longer time sweeps. Application of the Hilbert-Huang transform is presented as a refined method for the time-frequency analysis of nonstationary impact echo data. The basic properties of the method and its practical application for time-frequency analysis of impact echo data, signal filtering, and pattern identification are presented. Washington, DC National Research Council 2007 Transportation research record 2028 146 153 10.3141/2028-16 2016-02-19 OPUS4-20794 Beitrag zu einem Tagungsband Wiggenhauser, Herbert; Streicher, Doreen Non-destructive testing of bridges Japan Concrete Institute (JCI) 2009 4th International conference on construction materials: Performance, innovations and structural implications 4th International conference on construction materials (ConMat'09) Nagoya, Japan 2009-08-24 2009-08-26 Invited Lecture 1 1 7 2016-02-19 OPUS4-20770 Vortrag Wiggenhauser, Herbert Advanced NDT Methods for Quality Assurance of Concrete Structures 2009 7th International Symposium on Non-destructive Testing in Civil Engineering (NDT-CE) 7th International Symposium on Non-destructive Testing in Civil Engineering (NDT-CE) Nantes, France 2009-06-29 2010-07-03 2016-02-19 OPUS4-20773 Vortrag Wiggenhauser, Herbert NDT in Civil Engineering: Experience and Results of the FOR 384 Research Group 2009 Quantitative Nondestructive Evaluation (QNDE) 2009, University of Rhode Island Quantitative Nondestructive Evaluation (QNDE) 2009, University of Rhode Island Kingston, RI, USA 2009-07-27 2009-07-30 2016-02-19 OPUS4-20782 Vortrag Wiggenhauser, Herbert Non-destructive testing of bridges 2009 4th International Conference on Construction Materials: Performance, Innovations and Structural Implications 4th International Conference on Construction Materials: Performance, Innovations and Structural Implications Nagoya, Japan 2009-08-24 2009-08-26 2016-02-19 OPUS4-20798 Vortrag Wiggenhauser, Herbert Extending the Service Life of Structures Through Non-Destructive Evaluation 2009 Concrete Materials Sessions - Workshop 145 at the TRB 88th Annual Meeting Concrete Materials Sessions - Workshop 145 at the TRB 88th Annual Meeting Washington, D.C., USA 2009-01-11 2009-01-15 2016-02-19 OPUS4-20799 Vortrag Wiggenhauser, Herbert Alkali Transport on Concrete Measured with LIBS 2009 Meetings at the TRB 88th Annual Meeting, Committee AFF40 and Committee AFN10 Meetings at the TRB 88th Annual Meeting, Committee AFF40 and Committee AFN10 Washington, D.C., USA 2009-01-11 2009-01-15 2016-02-19 OPUS4-20800 Vortrag Wiggenhauser, Herbert OSSCAR - Development of an One-Site Scanner for Non-destructive Bridge Assessment 2009 Meeting at the TRB 88th Annual Meeting, Committee AFF40 Meeting at the TRB 88th Annual Meeting, Committee AFF40 Washington, D.C., USA 2009-01-11 2009-01-15 2016-02-19 OPUS4-20801 Vortrag Wiggenhauser, Herbert NDT-CE at BAM 2009 Meeting at the TRB 88th Annual Meeting, Committee AFF40 (1) Meeting at the TRB 88th Annual Meeting, Committee AFF40 (1) Washington, D.C., USA 2009-01-11 2009-01-15 2016-02-19 OPUS4-20802 Vortrag Wiggenhauser, Herbert BetoScan "Self Navigation Scanner System for Concrete Surface Diagnosis" 2009 Meeting at the TRB 88th Annual Meeting, Committee AFF40 Meeting at the TRB 88th Annual Meeting, Committee AFF40 Washington, D.C., USA 2009-01-11 2009-01-15 2016-02-19 OPUS4-20803 Vortrag Wiggenhauser, Herbert Automated NDE of PT Concrete Structures 2009 10th ACI International Conference on Recent Advances in Concrete Technology and Sustainable Issues 10th ACI International Conference on Recent Advances in Concrete Technology and Sustainable Issues Seville, Spain 2009-10-15 2009-10-17 2016-02-19 OPUS4-20942 Beitrag zu einem Tagungsband Shokouhi, Parisa; Zoëga, Andreas; Wiggenhauser, Herbert; Fischer, G. Macro-effect of microcracks on sonic surface wave velocity in concrete under compression Transportation Research Board 2010 89th TRB Annual Meeting 89th TRB Annual Meeting Washington, D.C., USA 2010-01-10 2010-10-14 1 17 2016-02-19 OPUS4-20952 Vortrag Wiggenhauser, Herbert Neue Entwicklungen der zerstörungsfreien Prüfung im Bauwesen 2010 Fachtagung Bauwerksdiagnose Fachtagung Bauwerksdiagnose Berlin, Germany 2010-02-18 2010-02-19 2016-02-19 OPUS4-20953 Vortrag Wiggenhauser, Herbert Zerstörungsfreie Prüfverfahren bzw. Zerstörungsfreie Prüfung im Bauwesen (ZfPBau) in der BAM 2010 VSVI-Seminar Woche 2010 VSVI-Seminar Woche 2010 Rendsburg, Germany 2010-01-28 2016-02-19 OPUS4-20899 Vortrag Wiggenhauser, Herbert The NDT-CE test and validation site at BAM-TTS, Horstwalde 2010 Transportation Research Board (TRB) 89th Annual Meeting Transportation Research Board (TRB) 89th Annual Meeting Washington, D.C., USA 2010-01-09 2010-01-14 2016-02-19 OPUS4-20900 Vortrag Wiggenhauser, Herbert Development of the On-Site SCAnneR (OSSCAR) 2010 Transportation Research Board (TRB) 89th Annual Meeting Transportation Research Board (TRB) 89th Annual Meeting Washington, D.C., USA 2010-01-09 2010-01-14 2016-02-19 OPUS4-20901 Vortrag Wiggenhauser, Herbert Application and Case Studies 2010 Transportation Research Board (TRB) 89th Annual Meeting, Workshop "Ultrasonic Imaging of Concrete" Transportation Research Board (TRB) 89th Annual Meeting, Workshop "Ultrasonic Imaging of Concrete" Washington, D.C., USA 2010-01-10 2016-02-19 OPUS4-20902 Vortrag Wiggenhauser, Herbert Non-Destructive Testing of Reinforced Concrete Structures at BAM 2010 National Research Council (NRC) National Research Council (NRC) Washington, D.C., USA 2010-01-20 2016-02-19 OPUS4-20903 Vortrag Wiggenhauser, Herbert Non-Destructive Testing in Civil Engineering 2010 Minnesota Department of Transportation Minnesota Department of Transportation Minneapolis, MN, USA 2010-01-22 2016-02-19 OPUS4-20904 Vortrag Wiggenhauser, Herbert Research in Non-Destructive Testing in Civil Engineering at BAM 2010 University of Minnesota, Warren Lecture Series - Spring 2010 University of Minnesota, Warren Lecture Series - Spring 2010 Minneapolis, MN, USA 2010-01-22 2016-02-19 OPUS4-20984 Beitrag zu einem Tagungsband Taffe, Alexander; Stoppel, Markus; Wiggenhauser, Herbert Zerstörungsfreie Prüfverfahren im Bauwesen (ZfPBau) Landesgütegemeinschaft Instandsetzung von Betonbauwerken Baden-Württemberg + Bayern e.V. 2010 Betoninstandsetzung im Ingenieur- und Wohnungsbau Betoninstandsetzung im Ingenieur- und Wohnungsbau Filderstadt/Stuttgart, Deutschland 2010-03-04 2010-03-04 35 58 2016-02-19 OPUS4-22844 Vortrag Wiggenhauser, Herbert Signal Analysis and Data Fusion of Multi Sensor NDE of Concrete 2010 National Seminar on Non-Destructive Evaluation NDE 2010 National Seminar on Non-Destructive Evaluation NDE 2010 Kolkata, India 2010-12-09 2010-12-11 2016-02-19 OPUS4-27060 Vortrag Wiggenhauser, Herbert Innovative Ultrasonic Techniques for Inspection and Monitoring of Large Concrete Structures 2012 NUCPERF 2012 NUCPERF 2012 Cadarache, France 2012-11-12 2012-11-15 2016-02-19 OPUS4-25480 Vortrag Wiggenhauser, Herbert ZfP im Bauwesen oder Wo ist der Fortschritt? 2012 Kolloquium für Gerd Dobmann, FhG IZFP Saarbrücken Kolloquium für Gerd Dobmann, FhG IZFP Saarbrücken Saarbrücken, Germany 2012-02-14 2012-02-14 2016-02-19 OPUS4-28851 Zeitschriftenartikel Lai Wai-Lok, Wallace; Kind, Thomas; Stoppel, Markus; Wiggenhauser, Herbert Measurement of accelerated steel corrosion in concrete using ground-penetrating radar and a modified half-cell potential method A new approach is presented to evaluate corrosion of steel bars in concrete by 1.5- and 2.6-GHz ground-penetrating radar (GPR) and a modified half-cell potential method. Changes in time-lapsed travel times, amplitudes, and peak frequencies that are associated with short-time Fourier transform spectrograms of the bar reflections were continuously measured. The year-long corrosion process of the reinforcement bar rapidly accelerated within a few days by impressing direct current across a pair of embedded reinforcement bars, which served as the anode and cathode. When corrosion started, the travel times, amplitudes, and frequency spectra of the bar reflection changed. The results were analyzed by dividing the material's response into three phases (NaCl contamination, depassivation, and corrosion). The writers attribute the phenomena of the first two phases to the ionic conduction and interfacial polarization effect, described in the low-frequency regime of complex dielectric permittivity outlined in the Maxwell-Wagner effect. The remaining phase corresponds with the appearance of large and multiple interfaces among steel, concrete, corrosion product, and cracks, in addition to the upward movement of the corrosion product to the concrete surface that intercepts wider radar footprints. The findings, based on time lapse measurements, provide a basis to further apply the GPR technique to spatial measurements in laboratory and field studies. New York, NY American Society of Civil Engineers (ASCE) 2013 Journal of infrastructure systems June 205 220 10.1061/(ASCE)IS.1943-555X.0000083 2016-02-20 OPUS4-29197 Posterpräsentation Wiggenhauser, Herbert Implementing NDE Technology and Effective Integration to an US Highway Agency Bridge Management Program 2013 5th European-American Workshop on Reliability of NDE, Berlin, 07.-10.10.2013 5th European-American Workshop on Reliability of NDE, Berlin, 07.-10.10.2013 Berlin, Germany 2013-10-07 2013-10-10 2016-02-20 OPUS4-29184 Vortrag Wiggenhauser, Herbert Nondestructive Evaluation of Steel-Concrete Mockups 2013 10th International Conference on NDE in Relation to Structural Integrity for Nuclear and Pressurized Components 10th International Conference on NDE in Relation to Structural Integrity for Nuclear and Pressurized Components Cannes, France 2013-10-01 2013-10-03 2016-02-20 OPUS4-29415 Beitrag zu einem Tagungsband Wolf, Julia; Mielentz, Frank; Milmann, Boris; Wiggenhauser, Herbert Grundlagenuntersuchungen von Ultraschall-Sensoren in Beton Für Ultraschallmessungen in Betonbauteilen wurden neuartige radialsymmetrisch abstrahlende Longitudinalwellenprüfköpfe mit einer Mittenfrequenz von 60 kHz auf deren Eignung hinsichtlich Abstrahlcharakteristik, Empfindlichkeit und Frequenzspektrum untersucht. Für die Messung der Abstrahlcharakteristiken wurden die Prüfköpfe vertikal und horizontal in Betonzylinder eingebettet und die Richtungsabhängigkeiten der Schallschnelle mithilfe eines Laservibrometers gemessen. Die Streuung der Prüfkopfempfindlichkeit wurde im Wasserbad unter Verwendung verschiedener Köpfe gleicher Bauart bestimmt. Außer Änderungen der Signalamplituden zeigten sich auch Schwankungen im Frequenzbereich bei verschiedenen Sender-Empfängerkombinationen. Die Schallschwächung des Betons hat Einfluss auf die erreichbare Auflösung der Messungen und damit auf die maximal möglichen Senderabstände im Bauteil. Durch experimentelle Untersuchungen und Simulationen erfolgte eine Optimierung der Abstände hinsichtlich des Aufwandes und der geforderten Auflösung. Die Signalschwächung im Beton wurde mit verschiedenen Impulsen im Frequenzbereich von 50 kHz bis 100 kHz in Abhängigkeit verschiedener Bewehrungsgrade und Korngrößen ermittelt. Hierfür wurden die Sensoren in unterschiedlichen Abständen in die Probekörper einbetoniert und die Empfangssignale hinsichtlich Amplitudenabfall und Frequenzspektrum untersucht. Deutsche Gesellschaft für zerstörungsfreie Prüfung e.V. (DGZfP) 2013 DGZfP-Jahrestagung 2013 978-3-940283-49-8 DGZfP-Jahrestagung 2013 Dresden, Germany 06.05.2013 08.05.2013 DGZfP-BB 141 (Poster 56) 1 9 urn:nbn:de:kobv:b43-294153 http://creativecommons.org/licenses/by/3.0/de/deed.de 2015-12-31 OPUS4-36521 Posterpräsentation Mielentz, Frank; Milmann, Boris; Krause, Martin; Wiggenhauser, Herbert Praxiseinsatz eines Ultraschall-Verfahrens zur Strukturuntersuchung von Betonbauteilen Einsatzbereiche des Meßsystems: - Ortung von Strukturelementen oder Verdichtungsmängeln in Beton - Dickenbestimmung von Bauteilen bei einseitiger Zugänglichkeit - Messung des Haftverbundes bei mehrschichtigen Bauteilen Auswerteverfahren: - Prinzip der laufzeitkorrigierten Überlagerung Vorteile: - Automatischer Meßablauf durch Array-Technik - Flexibler Einsatz durch lange Kabelverbindungen zwischen Prüfkopfarray und Meßapparatur 1999 Fachtagung Bauwerksdiagnose - Praktische Anwendungen Zerstörungsfreier Prüfungen Munich, Germany 21.01.1999 22.01.1999 2016-06-16 OPUS4-36524 Posterpräsentation Lausch, Regine; Colla, Camilla; Wiggenhauser, Herbert Impakt-Echo - Analyse von Anregungsspektren und deren baupraktische Relevanz Die IE-Methode wird seit vielen Jahren zur zerstörungsfreien Prüfung von Betonbauteilen eingesetzt. Bei Anwendung dieses Verfahrens besteht oft das Problem, resultierende Frequenzspektren infolge der vielen Peaks richtig zu interpretieren. Ein wichtiges Bewertungskriterium ist dabei die Amplitudengröße eines Peaks, welche u.a. durch das Anregungsspektrum beeinflusst wird. 2001 Fachtagung Bauwerksdiagnose - Praktische Anwendungen Zerstörungsfreier Prüfungen Leipzig, Germany 25.10.2001 26.10.2001 2016-06-16 OPUS4-36538 Posterpräsentation Wiggenhauser, Herbert; Wilsch, Gerd; Schaurich, Dieter; Wöstmann, Jens Betonanalyse mit Laserinduzierter Breakdown Spektroskopie (LIBS) Der große Vorteil der vorgestellten Methode liegt in der quasi on-line Bereitstellung der Ergebnisse und in der Möglichkeit des Einsatzes direkt am Bauwerk. Die vorliegenden Meßergebnisse zeigen den erfolgreichen Einsatz von LIBS zur Messung der Betonzusammensetzung. Eine Unterscheidung von Zementen gelingt durch die Einordnung der Meßwerte ins Dreistoffdiagramm. Neue kleine Laser, handliche Echellespektrographen und neuartige Lichtleiter lassen sich zu mobilen LIBS-Apparaturen kombinieren, die eine Messung undAuswertung vor Ort ermöglicht. 1999 Fachtagung Bauwerksdiagnose - Praktische Anwendungen Zerstörungsfreier Prüfungen Munich, Germany 21.01.1999 22.01.1999 2016-06-17 OPUS4-36539 Posterpräsentation Wiggenhauser, Herbert; Wilsch, Gerd; Schaurich, Dieter; Wöstmann, Jens Application of LIBS in civil engineering for the analysis of concrete Our aim is the application of LIBS as a simple, quasi on-line method for the non-destructive testing of concrete. Concrete is naturally inhomogeneous. Therefore we must take into account the local variation of the element composition using a statistical analysis. Depending on how much cement and aggregate is measured with each laser pulse, a scan on the surface of a concrete specimen produces a distribution of points in the Rankin diagram which is used to characterise the concrete. 2000 First International Conference on Laser Induced Plasma Spectroscopy and Applications Tirrenia, Italy 08.10.2000 12.10.2000 2016-06-17 OPUS4-36540 Posterpräsentation Wilsch, Gerd; Schaurich, Dieter; Wöstmann, Jens; Wiggenhauser, Herbert Nachweis von Hydrophobierungsmitteln mit Laser Induced Breakdown Spectroscopy Die Eignung des Verfahrens der Laser Induzierten Breakdown Spectroscopy (LIBS) zur Kontrolle einer ausreichenden Beschichtung und zur Bestimmung der Schichtdicke von Hydrophobierungsschichten auch im Rahmen wiederholender Messungen sollte untersucht werden. Mit LIBS kann die Elementverteilung orts- und tiefenaufgelöst in oberflächennahen Bereichen quasi on-line bestimmt werden. Es ist keine Probenpräparation notwendig. Wiederholende Messungen würden das vorzeitige Erkennen beschädigter Beschichtungen ermöglichen, wodurch kostspielige Sanierungsmaßnahmen vermieden werden. 2001 Fachtagung Bauwerksdiagnose - Praktische Anwendungen Zerstörungsfreier Prüfungen Leipzig, Germany 25.10.2001 26.10.2001 2016-06-17 OPUS4-37146 Zeitschriftenartikel Wai-Lok Lai, W.; Kind, Thomas; Fung-Chu Sham, J.; Wiggenhauser, Herbert Correction of GPR wave velocity at different oblique angles between traverses and alignment of line objects in a common offset antenna setting Estimation of ground penetrating radar's wave velocity in materials is a critical step to accurately estimate depth of embedded line objects in concrete structures, and wetness of material. Errors of velocity are defined as the deviations between the velocities obtained in various oblique angles and those obtained in the traverse normal to the object orientation in a common offset antenna setting. In this paper, we quantified and corrected the errors of such estimation. GPR traverses were designed to travel in various oblique angles θ (90°, 75°, 60° and 45°) relative to the steel bars at 5 cover depths (55 mm, 85 mm, 115 mm, 145 mm and 175 mm). GPR wave velocity at any position within the lateral detection range of steel bars was measured with simple trigonometry in a semi-automated in-house program. It was found that reduction of oblique angles (i.e. θ<90°) causes flatter hyperbolic reflections and the associated errors of velocity can be as much as 30% in the case of an oblique angle 45° before correction. Such errors were corrected after re-scaling the horizontal travel distance with a multiplication factor of sin θ. Elsevier Ltd. 2016 NDT & E International 82 36 43 10.1016/j.ndteint.2016.03.003 2016-08-17 OPUS4-31261 Zeitschriftenartikel Shokouhi, Parisa; Wolf, Julia; Wiggenhauser, Herbert Detection of delamination in concrete bridge decks by joint amplitude and phase analysis of ultrasonic array measurements The accuracy and precision of low-frequency (center frequency of approximately 55 kHz) ultrasonic testing for detection and characterization of delamination in concrete bridge decks were evaluated. A multiprobe ultrasonic testing system (with horizontally polarized shear-wave transducers) was used to detect built-in delamination defects of various size, depth, and severity (i.e., thickness) in a test specimen—a 6.1 m × 2.4 m × 216 mm (20 ft × 8 ft × 8.5 in.) reinforced concrete slab-built to simulate a concrete bridge deck. The collected data sets were reconstructed applying synthetic aperture focusing technique (SAFT). The reconstructed measurement results were then used to assess the condition of the concrete slab at individual points [point-by-point data collection and two-dimensional (2D) reconstruction] as well as along lines, where data were collected at smaller steps and reconstructed in a three-dimensional (3D) format. The local-phase information was also calculated, superimposed on the reconstructed images and used as complementary information in condition assessment. The precision and accuracy of condition assessments were evaluated. The results indicated that, using the multiprobe ultrasonic array, delamination defects as small as 30 cm² (1 ft²) could be reliably detected. Deep delaminations [i.e., those deeper than 150 mm (6 in.)] were directly detected and characterized, whereas shallow delaminations [shallower than 65 mm (2.5 in.)] were detected only indirectly. The precision of the measurements was demonstrated by comparing repeated measurements at several test points. Similar measurement results obtained on a delaminated portion of a real bridge deck support the conclusions of the validation study. Reston, Va. Soc. American Society of Civil Engineers (ASCE) 2014 Journal of bridge engineering 19 3 04013005-1 - 04013005-11 10.1061/(ASCE)BE.1943-5592.0000513 2016-02-20 OPUS4-31838 Zeitschriftenartikel Lai Wai-Lok, Wallace; Kind, Thomas; Kruschwitz, Sabine; Wöstmann, Jens; Wiggenhauser, Herbert Spectral absorption of spatial and temporal ground penetrating radar signals by water in construction materials This paper studies the spatial and temporal spectral absorption of reflector signals of a 1.5 GHz ground penetrating radar (GPR) during a drying process of a brickwall from initial wet to later dry state. The non-stationary GPR signals were processed with short time-Fourier transform (STFT) and wavelet transform (WT) in a novel spatial-time–frequency (STF) domain. Spatial distribution of peak frequency at the direct wave (DW) across the antenna and a backwall reflection was studied to characterize the mechanism of spectral absorption of GPR wave. Results from WT were shown to be more preferred to those from STFT because the WT offers multiple resolutions to cope with both low and high frequency components in GPR wavelets but STFT does not. In addition to the traditional GPR signal interpretation in time-domain and our previous works on time-frequency domain, the analysis method operated in the STF domain provides another possibility of material characterization by GPR in large and field scale. Oxford Butterworth-Heinemann 2014 NDT & E international 67 55 63 10.1016/j.ndteint.2014.06.009 2016-02-20 OPUS4-32077 Zeitschriftenartikel Wolf, Julia; Niederleithinger, Ernst; Mielentz, Frank; Grothe, Sven; Wiggenhauser, Herbert Überwachung von Betonkonstruktionen mit eingebetteten Ultraschallsensoren Die immer komplexere Konstruktionsweise von Neubauten einerseits und die alternde Infrastruktur andererseits erfordern in manchen Fällen eine dauerhafte Überwachung, um besondere Einwirkungen und gegebenenfalls Schädigungen rechtzeitig und genau zu erkennen. Hierfür ist eine Vielzahl von Methoden und Sensoren verfügbar. Das Portfolio weist aber insbesondere bei der Detektion langsamer, räumlich begrenzter Veränderungen Lücken auf. Hierfür sind bisher sehr aufwändige Untersuchungen oder Installationen notwendig. In der vorliegenden Arbeit werden Sensoren und zugehörige Auswertemethoden für die Ultraschalltransmission vorgestellt, die sich für die zerstörungsfreie, dauerhafte Überwachung von Beton eignen. Direkt oder nachträglich in Betonkonstruktionen eingebaut, ermöglichen sie eine nicht nur lokale, sondern größere Raumbereiche umfassende Dauerüberwachung von Änderungen der Materialeigenschaften. Das Prinzip der Ultraschalltransmission und die verschiedenen Einflussparameter werden vorgestellt. Zu letzteren gehören neben der Belastung und Schädigung auch Umweltparameter wie Temperatur und Feuchte. Verschiedene Methoden zur Datenanalyse, wie z. B. die Codawelleninterferometrie, ermöglichen eine Detektion kleinster Veränderungen. Die in den Beton einzubettenden Ultraschallsensoren werden vorgestellt und ihr Einbau und Betrieb beschrieben. Als Beispiele für Anwendungen werden Frost-Tauwechsel-Experimente im Labor, die Detektion von lokalen Lasten im Technikumsmaßstab und der Einsatz an realen Brücken diskutiert. Die Sensoren sind zum Teil bereits seit mehreren Jahren in Probeobjekte eingebettet und liefern zuverlässig wertvolle Daten.------------------------------------------------------------------------------------------------------------------------------------------------------------- Monitoring of concrete constructions by embedded ultrasonic sensors: Challenging new constructions and the ageing infrastructure are increasing the demand for permanent monitoring of loads and damages. Various methods and sensors are used for this purpose. But the technologies available today have difficulties in detecting slowly progressing locally confined damages. Extensive investigations or instrumentations are required so far for this purpose. In this study we present new sensors and data processing methods for ultrasonic transmission, which can be used for non-destructive permanent monitoring of concrete. They can be mounted during construction or thereafter. Larger volumes can be monitored by a limited number of sensors for changes of material properties. The principles of ultrasonic transmission and influencing factors are presented. This latter include load, damages as well as environmental parameters as temperature or moisture. Various methods for data processing, e. g. coda wave interferometry are introduced. They allow the detection of very small changes in the medium. The embedded sensors are shown including mounting and operation. Application examples so far include small scale laboratory freeze-thaw experiments, localizing loads in larger concrete models and monitoring load effects on real structures. Some sensors are operating already for several years. Berlin Ernst & Sohn 2014 Bautechnik 91 11 783 796 10.1002/bate.201400073 2016-02-20 OPUS4-30249 Vortrag Wiggenhauser, Herbert State-of-the-Art of Non-Destructive Testing Methods and Technologies for Nuclear Power Plant Safety-Related Concrete Structures 2014 Advanced Course on Sustainable Engineering Concrete - SECON 2014 Advanced Course on Sustainable Engineering Concrete - SECON 2014 Chennai, India 2014-02-05 2014-02-07 2016-02-20 OPUS4-30250 Vortrag Wiggenhauser, Herbert State-of-the-Art of Non-Destructive Testing Methods and Technologies for Nuclear Power Plant Safety-Related Concrete Structures 2014 First International Conference on Structural Integrity First International Conference on Structural Integrity Kalpakkam, India 2014-02-04 2014-02-07 2016-02-20 OPUS4-32028 Beitrag zu einem Tagungsband Wolf, Julia; Mielentz, Frank; Milmann, Boris; Helmerich, Rosemarie; Köpp, Christian; Wiggenhauser, Herbert; Kurz, J.H.; Moryson, R.M.; Samokrutov, A.; Alekhin, S. G.; Alver, Ninel; Sazak, H.Ö. An ultrasound monitoring system for concrete structures The research project "Ultrasonic Net for Concrete Monitoring (UNeCOM)" aims at developing a methodology for an embedded ultrasonic network for the condition assessment of infrastructure constructions. Civil engineering structures made of concrete, which are located in tectonically active regions or undergo special loading conditions, may require continuous monitoring. It is important to assess the condition of the building and its stability to recognise and classify the effect of a seismic event or evolving damage at early stages before failure occurs. Embedded ultrasonic sensors offer the possibility to detect changes in the material and degradation mechanisms from inside the structure in areas which are difficult or impossible to inspect otherwise. In contrast to conventional ultrasonic testing methods, where the concrete surfaces are scanned with ultrasound probes, this new approach uses sensors, which are embedded into concrete, eliminating the effect of variable coupling conditions between sensors and concrete. This method allows an integral detection of changes in the concrete structure, for example due to seismic activities, to detect mechanical impacts, as well as degradation of the material due to overloading. Such methods have great relevance especially for the monitoring of constructions like power plants, bridges, offshore structures and other structures with high technical safety requirements. The sensor network can be controlled remotely through the internet which is also being used for data transfer. The embedded sensor network is designed to monitor structural damage and concrete degradation globally with high sensitivity. 2014 Istanbul bridge conference 2014 (Proceedings) 978-605-64131-6-2 Istanbul bridge conference 2014 Istanbul, Turkey 11.08.2014 13.08.2014 Paper 32, 1 9 2016-02-20 OPUS4-31397 Zeitschriftenartikel Hong, Shuxian; Lai Wai-Lok, Wallace; Wilsch, Gerd; Helmerich, Rosemarie; Helmerich, R.; Günther, Tobias; Wiggenhauser, Herbert Periodic mapping of reinforcement corrosion in intrusive chloride contaminated concrete with GPR This paper presents an experimental effort for developing a novel reinforcement corrosion monitoring technique based on Ground Penetrating Radar (GPR). Experiments were carried out to periodically monitor the accelerated reinforcement corrosion process with GPR. The data were processed in both time and time–frequency domains to investigate the tendencies of GPR signal attribute changes related with corrosion, moisture and chloride contamination. Data processing methods were proposed to visualize the reinforcement corrosion and chloride distribution with target specified signal attribute mapping. Half-Cell Potential (HCP) and Laser-Induced Breakdown Spectroscopy (LIBS) methods were employed to verify the GPR observations. Amsterdam Elsevier Science 2014 Construction and building materials 66 671 684 10.1016/j.conbuildmat.2014.06.019 2016-02-20 OPUS4-31600 Vortrag Wiggenhauser, Herbert Laser Induced Breakdown Spectrocsopy (LIBS) - Visualizaton of Ion Transport Processes in Concrete 2014 NDE/NDT for Structural Materials Technology for Highways and Bridges (SMT) 2014 NDE/NDT for Structural Materials Technology for Highways and Bridges (SMT) 2014 Washington, D.C., USA 2014-08-25 2014-08-27 2016-02-20 OPUS4-31724 Beitrag zu einem Tagungsband Wilsch, Gerd; Eichler, Thorsten; Millar, Steven; Wiggenhauser, Herbert Laser induced breakdown spectroscopy (LIBS) - visualization of ion transport processes in concrete Laser induced breakdown spectroscopy (LIBS) is a combination of laser ablation and optical emission spectroscopy. Due to the possibility of direct measurements on the sample surface and a minimum of sample preparation investigations of building materials can be conducted quite fast. In combination with a scanning technique (translation stage or scanning mirrors head) the element distributions are evaluated with mm resolution. Thus the heterogeneity of the material may be considered. This is a significant advantage compared to standard procedures. LIBS measurements are also time and cost saving in comparison to standard methods. The automated measurement procedures minimize the liability for errors. All elements are detectable. Results can be quantified after calibration. At BAM LIBS has been successfully applied for the investigation of distribution and transport of different ions in building materials. Quantitative measurements are performed for chlorine, sodium, potassium, sulfur, lithium and hydrogen. In addition the identification of substances and the evaluation of quantitative ratios by means of an integrated marker are possible. An overview about the principle and the possibilities of LIBS investigations of building materials is presented and typical applications are shown. The LIBS technique is close to practical application on-site. The American Society for Nondestructive Testing (ASNT) 2014 SMT 2014 - NDE/NDT for highways and bridges - Structural materials technology 978-1-57117-342-3 SMT 2014 - NDE/NDT for highways and bridges - Structural materials technology Washington, DC, USA 25.08.2014 27.08.2014 364 371 2016-02-20 OPUS4-31032 Beitrag zu einem Tagungsband Wiggenhauser, Herbert; Kind, Thomas; Krause, Martin; Schulze, S.; Taffe, A.; Trela, Christiane; Wöstmann, Jens Praktische Anwendung zerstörungsfreier Prüfverfahren an Brücken Die drei Beispiele zerstörungsfreier Prüfungen an Spannbetonbrücken zeigen unterschiedliche Problemstellungen und deren Lösung mit unterschiedlichen Ansätzen. Allen drei Beispielen gemeinsam ist die Verwendung kommerzieller Geräte. Diese werden von verschiedenen Anbietern bereitgestellt. Eine weitere Gemeinsamkeit ist, dass die Grundgeräte durch zusätzliche Maßnahmen ergänzt. Erst dann ist der gewünschte Untersuchungserfolg sicher gestellt. Im ersten Beispiel wurde die vom Auftraggeber geforderte Präzision dadurch erreicht, dass systematische Voruntersuchungen stattfanden. Die Übertragung der Lokalisierung direkt auf die Betonoberfläche stellte sicher, dass keinen Informationsverluste an die nachfolgenden Aufgaben auftraten. Das zweite Beispiel zeigt den Nutzen von Automatisierung und Kombination von Verfahren. Damit können dem Auftraggeber die notwendigen Angaben über Einbauteile mit großer Detaitreue und leicht verständlicher Visualisierung aufbereitet werden. Der abschließende Bericht zeigt, wie vorhandene Auswertungen sinnvoll durch noch in der Forschung befindliche Ansätze bereichert werden. Insgesamt ist die zerstörungsfreie Prüfung in der Lage, an Brücken preisrelevante Fragestellungen zu lösen. Voraussetzung hierfür ist eine sorgfältig geplante Vorgehensweise und ein sicheres Verständnis der Grundlage der eingesetzten Geräte und Auswertungsschritte. Technische Akademie Esslingen (TAE) 2014 1. Brückenkolloquium - Beurteilung, Ertüchtigung und Instandsetzung von Brücken 1. Brückenkolloquium - Beurteilung, Ertüchtigung und Instandsetzung von Brücken Ostfildern/Stuttgart, Germany 24.06.2014 25.06.2014 Paper 00_08, 1 8 2016-02-20 OPUS4-21594 Zeitschriftenartikel Shokouhi, Parisa; Zoëga, Andreas; Wiggenhauser, Herbert Nondestructive investigation of stress-induced damage in concrete The changes in the sonic surface wave velocity of concrete under stress were investigated in this paper. Surface wave velocities at sonic frequency range were measured on a prismatic concrete specimen undergoing several cycles of uniaxial compression. The loading was applied (or removed) gradually in predefined small steps (stress-controlled). The surface wave velocity was measured at every load step during both loading and unloading phases. Acoustic Emission (AE) test was conducted simultaneously to monitor the microcracking activities at different levels of loading. It was found that the sonic surface wave velocity is highly stress dependent and the velocity-stress relationship follows a particular trend. The observed trend could be explained by a combination of acoustoelasticity and microcracking theories, each valid over a certain range of applied stresses. Having measured the velocities while unloading, when the material suffers no further damage, the effect of stress and damage could be differentiated. The slope of the velocity-stress curves over the elastic region was calculated for different load cycles. This quantity was normalized to yield a dimensionless nonlinear parameter. This parameter generally increases with the level of induced damage in concrete. New York, NY, USA Hindawi Publ. Corp. 2010 Advances in civil engineering 2010 Article ID 740189 1 9 urn:nbn:de:kobv:b43-215943 10.1155/2010/740189 http://creativecommons.org/licenses/by/3.0/de/deed.de 2016-02-19 OPUS4-20140 Beitrag zu einem Sammelband Niederleithinger, Ernst; Wiggenhauser, Herbert; Taffe, Alexander The NDT-CE test and validation center in Horstwalde Laboratoire Central des Ponts et Chaussées 2009 NDTCE `09 - 7th International symposium on nondestructive testing in civil engineering (Proceedings) 978-2-7208-2542-5 NDTCE ´09 - 7th International symposium on nondestructive testing in civil engineering Nantes, France 2009-06-30 2009-07-03 1 6 2016-02-19 OPUS4-21925 Beitrag zu einem Tagungsband Srinivasan, P.; Wiggenhauser, Herbert; Murthy, S.G.N.; Bhaskar, S.; Ravisankar, K.; Iyer, N.R. Advanced non-destructive testing methods for application to reinforced concrete structures - Collaborative research between SERC and BAM Nondestructive testing (NDT) of concrete structures plays an important role in civil engineering. CSIR-SERC, India, for the past three decades involved in the conditon assessment of civil infrastructures based on the expertise and the methodology developed in the area of NDT. Prof., Wiggenhauser, BAM, Berlin visited SERC, under the CSIR- Humboldt Reciprocity Research Award for 2006. During his visit, scientists of SERC have gained knowledge in the area of advanced NDT methods. A unique large scale two storied reinforced concrete specimen was cast at SERC, with columns and beams of different sizes, cross section having different percentages of reinforcement. The defects suc has honeycombs, cracks, delamination, presence od conduits, ducts, etc. were also incorporated. Facilities were created at SERC in the area of advanced NDT methods. BAM, Germany, has offered assistance to three scientists of SERC to work at BAM and to have further exposure in the area of advanced NDT methods. One of the scientists is pursuing Ph.D., in the application of advanced NDT methods for identification of damage in concrete structures. Activities have been carried out on the NDT-CE (Non-Destructive Testing in Civil Engineering) Compendium which is a compilation of the descriptions of 115 methods. It is freely accessible on the Internet. This paper highlights the collaborative research work carried out by SERC and BAM in the area of advanced NDT methods for the evaluation of defects/ damage in reinforced concrete structures and also as a quality assurance tool. The future programme of work is also discussed. Tokyo, Japan 2010 5th World conference on structural control and monitoring (5WCSCM) 5th World conference on structural control and monitoring (5WCSCM) Tokyo, Japan 2010-07-12 2010-07-14 A-7 / 044 1 11 2016-02-19 OPUS4-22487 Beitrag zu einem Sammelband Reichling, K.; Raupach, M.; Wiggenhauser, Herbert; Stoppel, Markus; Dobmann, G.; Kurz, J. Odile Abraham, ; Dérobert, Xavier BETOSCAN - Robot controlled non-destructive diagnosis of reinforced concrete decks Laboratoire Central des Ponts et Chaussées 2009 NDTCE `09 - 7th international symposium on non destructive testing in civil engineering (Proceedings) 978-2-7208-2542-5 NDTCE `09 - 7th international symposium on non destructive testing in civil engineering Nantes, France 2009-06-30 2009-07-03 Paper 77 425 432 2016-02-19 OPUS4-22439 Vortrag Wiggenhauser, Herbert Zerstörungsfreie Prüfverfahren im Bauwesen - ein Überblick 2010 Informationstag "Moderne Bauwerksprüfung - Technische und rechtliche Aspekte" an der Bundesanstalt für Straßenwesen (BASt) Informationstag "Moderne Bauwerksprüfung - Technische und rechtliche Aspekte" an der Bundesanstalt für Straßenwesen (BASt) Bergisch Gladbach, Germany 2010-11-10 2016-02-19 OPUS4-22479 Vortrag Wiggenhauser, Herbert Non-Destructive Testing in Civil Engineering 2010 Eingeladener Gastvortrag an der Ege Universität Izmir Eingeladener Gastvortrag an der Ege Universität Izmir Izmir, Turkey 2010-10-17 2010-10-22 2016-02-19 OPUS4-22485 Beitrag zu einem Tagungsband Reichling, K.; Raupach, M.; Wiggenhauser, Herbert; Stoppel, Markus; Dobmann, G.; Kurz, J. BETOSCAN - A robotic system for simultaneous diagnoses of reinforced concrete structures Bagneux RILEM Publ. 2009 NUCPERF 2009 - Long term performance of cementitious barriers and reinforced concrete in nuclear power plants and waste management (Proceedings) 978-2-35158-072-1 NUCPERF 2009 - Long term performance of cementitious barriers and reinforced concrete in nuclear power plants and waste management Cadarache, France 2009-03-30 2009-04-02 64 1 7(?) 2016-02-19 OPUS4-22642 Beitrag zu einem Tagungsband Shokouhi, Parisa; Zoëga, Andreas; Wiggenhauser, Herbert Thompson, D.O.; Chimenti, D.E. Nondestructive evaluation of damage in concrete under uniaxial compression Surface wave velocities over the sonic frequency range (<20 KHz) were measured on concrete specimens undergoing various cycles of loading and unloading. Acoustic Emission test (AE) was conducted simultaneously to monitor the microcracking activities. The sonic surface wave velocity was found to be highly stress-dependent. The observed changes in surface wavespeed are repeatable and follow a particular trend. By measuring the wave velocities in both loading and unloading phases, the effects of stress and stress-induced damages could be distinguished. The observed trend could be explained by a combination of acoustoelasticity and microcracking theories. Melville, NY American Institute of Physics 2010 QNDE conference 2010 - Review of progress in quantitative nondestructive evaluation (Proceedings) 978-0-7354-0748-0 36th Annual Review of Progress in Quantitative Nondestructive Evaluation Kingston, RI, USA 2009-07-26 2009-07-31 1525 1532 2016-02-19 OPUS4-23972 Zeitschriftenartikel Lai Wai-Lok, Wallace; Kind, Thomas; Wiggenhauser, Herbert A study of concrete hydration and dielectric relaxation mechanism using ground penetrating radar and short-time fourier transform Ground penetrating radar (GPR) was used to characterize the frequency-dependent dielectric relaxation phenomena in ordinary Portland cement (OPC) hydration in concrete changing from fresh to hardened state. The study was experimented by measuring the changes of GPR A-scan waveforms over a period of 90 days, and processed the waveforms with short-time Fourier transform (STFT) in joint time-frequency analysis (JTFA) domain rather than a conventional time or frequency domain alone. The signals of the direct wave traveled at the concrete surface and the reflected wave from an embedded steel bar were transformed with STFT, in which the changes of peak frequency over ages were tracked. The peak frequencies were found to increase with ages and the patterns were found to match closely with primarily the well-known OPC hydration process and secondarily, the evaporation effect. The close match is contributed to the simultaneous effects converting free to bound water over time, on both conventional OPC hydration and dielectric relaxation mechanisms. New York, NY, USA Hindawi Publ. 2010 EURASIP journal on advances in signal processing Article ID 317216 1 14 urn:nbn:de:kobv:b43-239723 10.1155/2010/317216 http://creativecommons.org/licenses/by/3.0/de/deed.de 2016-02-19 OPUS4-23961 Zeitschriftenartikel Alver, Ninel; Wiggenhauser, Herbert Modified SIBIE procedure for ungrouted tendon ducts applied to scanning impact-echo The impact-echo method has been successfully applied to identify defects inside concrete. In addition, to detect ungrouted tendon ducts in a large concrete slab, a scanning impact-echo technique is developed. However, since resonant frequencies in the spectrum responsible for the travel paths via defects are only taken into account, the method could lead to erroneous results due to complicated spectra obtained in the tests. Consequently, Stack Imaging of spectral amplitudes Based on Impact-Echo (SIBIE) procedure has been developed to improve the data interpretation. Conventionally, SIBIE is applied to a single measurement data and a point information of defects is obtained at the area, where the impact test is performed. In this study, SIBIE is applied to scanning impact-echo data. Locations of ungrouted tendon ducts embedded in a large concrete specimen are investigated. In order to visualize the whole cross-section tested, the SIBIE analysis is modified, introducing an elliptical integration mode. It is demonstrated that ungrouted tendon ducts are successfully located by the modified SIBIE analysis, whereas results of the conventional B-scan analysis are not so good as the modified SIBIE analysis. Amsterdam Elsevier Science 2010 Construction and building materials 24 12 2388 2392 10.1016/j.conbuildmat.2010.05.012 2016-02-19 OPUS4-18668 Beitrag zu einem Tagungsband Raupach, M.; Reichling, K.; Wiggenhauser, Herbert; Stoppel, Markus; Dobmann, G.; Kurz, J. M.G. Alexander, ; H.-D. Beushausen, ; F. Dehn, ; P. Moyo, BETOSCAN - An instrumented mobile robot system for the diagnosis of reinforced concrete floors Boca Raton CRC Press 2009 Proceedings of the international conference on concrete repair, rehabilitation and retrofitting II 978-0-415-46850-3 2nd International Conference on Concrete Repair, Rehabilitation and Retrofitting Cape Town, South Africa 2008-11-24 2008-11-26 651 655 2016-02-19 OPUS4-18602 Beitrag zu einem Tagungsband Taffe, Alexander; Kind, Thomas; Stoppel, Markus; Wiggenhauser, Herbert M.G. Alexander, ; H.-D. Beushausen, ; F. Dehn, ; P. Moyo, OSSCAR - Development of an On-Site SCAnneR for automated non-destructive bridge testing Boca Raton CRC Press 2009 Proceedings of the international conference on concrete repair, rehabilitation and retrofitting II 978-0-415-46850-3 2nd International Conference on Concrete Repair, Rehabilitation and Retrofitting Cape Town, South Africa 2008-11-24 2008-11-26 541 545 2016-02-19 OPUS4-19114 Beitrag zu einem Sammelband Zoëga, Andreas; Wiggenhauser, Herbert Propagation time of elastic surface waves on concrete specimens under uniaxial loads Oakland, CA, USA The American Society for Nondestructive Testing (ASNT) 2008 NDE/NDT for Highways and Bridges - Structural Materials Technology (SMT) 978-1-57117-180-1 NDE/NDT for Highways and Bridges - Structural Materials Technology (SMT) Oakland, CA, USA 2008-09-08 2008-09-12 161 167 2016-02-19 OPUS4-19462 Zeitschriftenartikel Zoëga, Andreas; Shokouhi, Parisa; Wiggenhauser, Herbert Nagesh R. Iyer, ; K. Balaji Rao, ; N. Gopalakrishnan, ; Bharatkumar, B. H.; V. Kalyanaraman, Propagation time of elastic surface waves on concrete specimens under uniaxial loads Madras Structural Engineering Research Centre 2009 Journal of structural engineering 36 1 11 15 2016-02-19 OPUS4-22959 Vortrag Wiggenhauser, Herbert Advanced NDT Methods for Quality Assurance of Concrete Structures 2010 National Seminar on Non-Destructive Evaluation NDE 2010 National Seminar on Non-Destructive Evaluation NDE 2010 Kolkata, India 2010-12-09 2010-12-11 2016-02-19 OPUS4-23767 Vortrag Wiggenhauser, Herbert Automated NDE of Structures with Combined Methods 2011 International Symposium on Nondestructive Testing of Materials and Structures NDTMS-2011 International Symposium on Nondestructive Testing of Materials and Structures NDTMS-2011 Istanbul, Turkey 2011-05-15 2011-05-18 2016-02-19 OPUS4-38288 Beitrag zu einem Tagungsband Völker, Christoph; Kruschwitz, Sabine; Boller, C.; Wiggenhauser, Herbert Feasibility study on adapting a machine learning based multi-sensor data fusion approach for honeycomb detection in concrete We present the results of a machine learning (ML)- inspired data fusion approach, applied to multi-sensory nondestructive testing (NDT) data. Our dataset consists of Impact-Echo (IE), Ultrasonic Pulse Echo (US) and Ground Penetrating Radar (GPR) measurements collected on large-scale concrete specimens with built-in simulated honeycombing defects. In a previous study we were able to improve the detectability of honeycombs by fusing the information from the three different sensors with the density based clustering algorithm DBSCAN. We demonstrated the advantage of data fusion in reducing the false positives up to 10% compared to the best single sensor, thus, improving the detectability of the defects. The main objective of this contribution is to investigate the generality, i.e. whether the conclusions from one specimen can be adapted to the other. The effectiveness of the proposed approach on a separate full-scale concrete specimen was evaluated. Portland, Oregon, USA The American Society for Nondestructive Testing, Inc 2016 Proceedings of the NDE/NDT for Highway and Bridges: Structural Materials Technology 2016 Conference 978-1-57117-392-8 NDE/NDT for Highway and Bridges: Structural Materials Technology 2016 Portland, Oregon, USA 29.08.2016 31.08.2016 144 148 2017-01-19 OPUS4-37679 Beitrag zu einem Tagungsband Wilsch, Gerd; Gottlieb, Cassian; Millar, Steven; Wiggenhauser, Herbert Laser induced breakdown spectroscopy (LIBS) - automated 2D chemical analysis of concrete Laser-induced breakdown spectroscopy (LIBS) is a combination of laser ablation and optical emission spectroscopy. Due to the possibility of direct measurements on the sample surface with a minimum of sample preparation investigations of building materials can be conducted quite fast. In combination with a scanning technique (translation stage or scanning mirrors head) 2D element distributions of harmful species like chlorides and alkalis are evaluated with a sub-mm resolution. By scanning a surface of typically 100 mm x 100 mm the heterogeneity of the material may be considered. LIBS is capable to identify hot spots in element concentration with a resolution of 0.1 mm or even smaller. A LIBS-system for the on-site application on building materials is, in cooperation with system developers and companies which will use this technique for investigation on real structures, under test at BAM. We present an example. Further work will focus on providing guidelines to establish LIBS as a standard procedure for chemical investigations of building materials. Columbus, OH 43228-0518, USA The American Society for Nondestructive Testing, Inc. The American Society for Nondestructive Testing 2016 NDE / NDT for Highway and Bridges: Structural Materials Technology 978-1-57117-392-8 NDE / NDT for Highway and Bridges: Structural Materials Technology Portland, Oregon, USA 29.08.2016 31.08.2016 155 160 2016-10-12 OPUS4-38346 Zeitschriftenartikel Hong, Shuxian; Wiggenhauser, Herbert; Helmerich, Rosemarie; Peng, B.D.; Xing, D. F. Long-term monitoring of reinforcement corrosion in concrete using ground penetrating radar A new method for periodically monitoring reinforcement corrosion in concrete with Ground-Penetrating Radar (GPR) is proposed and a ten-year long-term corrosion periodic monitoring experiment is reported. GPR historical data was taken in different years, under different conditions. In order to align and normalize the obtained images properly prior to effectively performing any automatic defect detection, image registration techniques based on mutual-information are employed, and a new signal processing scheme is proposed for normalizing the intensity of GPR images. Then, the processed image results can be used to compare and find out the change of GPR detection due to corrosion. Elsevier Ltd. 2017 Corrosion Science 114 123 132 10.1016/j.corsci.2016.11.003 2017-01-10 OPUS4-34537 Beitrag zu einem Tagungsband Krause, Martin; Mauke, R.; Effner, Ute; Milmann, Boris; Völker, Christoph; Wiggenhauser, Herbert Ultrasonic testing of a sealing construction made of salt concrete in an underground disposal facility for radioactive waste Technische Universität Berlin / Bundesanstalt für Materialforschung und -prüfung 2015 NDT-CE 2015 - International symposium non-destructive testing in civil engineering (Proceedings) NDT-CE 2015 - International symposium non-destructive testing in civil engineering Berlin, Germany 2015-09-15 2015-09-17 696 699 2016-02-20 OPUS4-34538 Zeitschriftenartikel Wiggenhauser, Herbert; Samokrutov, A.A.; Mayer, K.; Krause, Martin; Alekhin, S. G.; Elkin, V. LAUS - Large aperture ultrasonic system - for testing thick concrete structures A Large Aperture UltraSonic (LAUS) system has been designed and built for testing thick concrete structures. The scalable system consists of twelve ultrasonic units, each hosting 32 individual shear wave transducers with mechanical dry point contact (DPC) to the concrete surface. The twelve units are attached to the concrete surface using a vacuum case which holds them in place during operation. Each LAUS unit can be placed individually depending on the surface condition and optimal ultrasonic condition, e.g. rebar position. Air pressure is supplied to each unit through an air hose. The following extended abstract is a short version of an article to be published in the special edition of ASCE JIS that will describe the outline of the system, the principle of functioning, the data processing and adapted reconstruction calculation based on SAFT as well as the system performance during first applications. Kirchwald NDT.net 2015 The e-journal of nondestructive testing & ultrasonics 20 NDT-CE 2015 - International symposium non-destructive testing in civil engineering Berlin, Germany 15.09.2015 17.09.2015 11 1 4 urn:nbn:de:kobv:b43-345383 http://creativecommons.org/licenses/by-nd/3.0/de/ 2016-02-20 OPUS4-34533 Zeitschriftenartikel Maack, Stefan; Thunell, B.; Wiggenhauser, Herbert Study of special challenges for NDT-methods on nuclear structures The special design of buildings, constructed for nuclear power plants is a particular challenge for the nondestructive testing in the building industry. In particular the major component thicknesses, the degree of reinforcement and surface coating systems make the application of NDT methods difficult. The studies first steps were undertaken to determine to which extent established applications of these techniques are useable in the field of infrastructure buildings. Methods have been evaluated that are already state of the art. So for example the ground penetrating radar was used for locating metallic mounting parts. Furthermore, the low-lying internal structure of the containment was investigated with the ultrasonic method. Kirchwald NDT.net 2015 The e-journal of nondestructive testing & ultrasonics 20 NDT-CE 2015 - International symposium non-destructive testing in civil engineering Berlin, Germany 15.09.2015 17.09.2015 11 1 4 urn:nbn:de:kobv:b43-345330 http://creativecommons.org/licenses/by-nd/3.0/de/ 2016-02-20 OPUS4-34555 Vortrag Wiggenhauser, Herbert Advanced NDT methods for the assessment of concrete structures 2008 International Conference on Concrete Repair, Rehabilitation and Retrofitting ICCRRR 2008 International Conference on Concrete Repair, Rehabilitation and Retrofitting ICCRRR 2008 Cape Town, South Afrika 2008-11-24 2008-11-26 2016-02-20 OPUS4-34557 Vortrag Wiggenhauser, Herbert Praktische Anwendung zerstörungsfreier Prüfverfahren an Brücken 2015 1. Brückenkolloquium an der TA Esslingen 1. Brückenkolloquium an der TA Esslingen Ostfildern, Deutschland 2015-06-24 2015-06-25 2016-02-20 OPUS4-34563 Zeitschriftenartikel Niederleithinger, Ernst; Wolf, Julia; Mielentz, Frank; Wiggenhauser, Herbert; Pirskawetz, Stephan Embedded ultrasonic transducers for active and passive concrete monitoring Recently developed new transducers for ultrasonic transmission, which can be embedded right into concrete, are now used for non-destructive permanent monitoring of concrete. They can be installed during construction or thereafter. Large volumes of concrete can be monitored for changes of material properties by a limited number of transducers. The transducer design, the main properties as well as installation procedures are presented. It is shown that compressional waves with a central frequency of 62 kHz are mainly generated around the transducer's axis. The transducer can be used as a transmitter or receiver. Application examples demonstrate that the transducers can be used to monitor concrete conditions parameters (stress, temperature, …) as well as damages in an early state or the detection of acoustic events (e.g., crack opening). Besides application in civil engineering our setups can also be used for model studies in geosciences. Basel MDPI 2015 Sensors 15 5 9756 9772 urn:nbn:de:kobv:b43-345632 10.3390/s150509756 http://creativecommons.org/licenses/by/3.0/de/deed.de 2016-02-20 OPUS4-32846 Beitrag zu einem Tagungsband Schulze, S.; Krause, Martin; Mayer, K.; Redmer, Bernhard; Wiggenhauser, Herbert Grouting defects localized by ultrasonic testing including phase evaluation Grouting defects, e.g. in post-tensioned structures or piped anchors may be identified by ultrasonic imaging. Since several years experiences are carried out with false color displayed phase values, which enable distinct localization of ungrouted regions. In this contribution we report on progress in localizing grouting defects in tendon ducts, when they are only partly grouted and the unfilled part is not orientated into the direction of the measuring surface. This is frequently the case e.g. for box girder structures. Düring the project specimens containing different types of grouting faults are investigated in Order to optimize measuring and evaluation techniques. A handheld linear array System (commercially available) is applied for fast 2D-measurement and subsequent phase sensitive 3D-imaging (new Software development). In a large concrete wall specimen tendon ducts and real prestressing Systems containing grouting defects were built in. The ducts are partly covered by non prestressed reinforcement bars in order to investigate its disturbing influence. These included objects were investigated afterwards with the described methods. We report on large area measuring results, which were partly verified by y-radiography. In the frame of practical application results of measuring the position and extend of a blockade within a posttensioned structure are presen ted. The American Society for Nondestructive Testing (ASNT) 2014 SMT 2014 - NDE/NDT for highways and bridges - Structural materials technology 978-1-57117-342-3 SMT 2014 - NDE/NDT for highways and bridges - Structural materials technology Washington, DC, USA 25.08.2014 27.08.2014 321 328 2016-02-20 OPUS4-34373 Vortrag Wiggenhauser, Herbert LAUS - Large Aperture Ultrasonic System - for Testing Thick Concrete Structures 2015 International Symposium Non-Destructive Testing in Civil Engineering (NDT-CE) International Symposium Non-Destructive Testing in Civil Engineering (NDT-CE) Berlin 2015-09-15 2015-09-17 2016-02-20 OPUS4-34374 Vortrag Wiggenhauser, Herbert Nondestructive testing in Civil Engineering 2015 Golden Jubilee celebration of SERC Recent Advances in Structural Engineering Golden Jubilee celebration of SERC Recent Advances in Structural Engineering Indien 2015-05-07 2015-05-08 2016-02-20 OPUS4-34375 Vortrag Wiggenhauser, Herbert Classification of Nondestructive Evaluation Tasks for Reinforced Concrete Structures 2015 Transportation Research Board 94th Annual Meeting Transportation Research Board 94th Annual Meeting Washington, D. C. 2015-01-11 2015-01-15 2016-02-20 OPUS4-34769 Beitrag zu einem Tagungsband Wiggenhauser, Herbert M.G. Alexander, ; H.-D. Beushausen, ; F. Dehn, ; P. Moyo, Advanced NDT methods for the assessment of concrete structures Boca Raton CRC Press 2009 Proceedings of the international conference on concrete repair, rehabilitation and retrofitting II 978-0-415-46850-3 2nd International Conference on Concrete Repair, Rehabilitation and Retrofitting Cape Town, South Africa 2008-11-24 2008-11-26 21 33 2016-02-20 OPUS4-34572 Zeitschriftenartikel Helmerich, Rosemarie; Mielentz, Frank; Milmann, Boris; Adam, Louisa; Villalobos, S.; Guimaraes, M.; Wiggenhauser, Herbert Detection of cracks perpendicular to the surface using acoustic methods Cracks perpendicular to the surface may be initial indicators for a deterioration process of concrete structures. Moisture penetrates inside the structure and transports adverse chemicals. The paper presents an investigation about the reliability of available commercial non-destructive evaluation techniques to reliably estimate the depth of surface-breaking cracks in reinforced concrete structures. Aim of the study was the investigation of surface-braking cracks under laboratory conditions. Commercial acoustic devices as impact echo equipment, single ultrasonic transducers and arrays were applied even if they have not been developed for this purpose. The commercial software and descriptions for application was followed strictly to compare the function, precision and repeatability of the measurements. Both, perpendicular notches and cracks have been considered. The study was completed with a discussion about reference specimens. The study was the basis for formulation of gaps in research. The Electric Power Research Institute (EPRI) has initiated and funded a Project. Kirchwald NDT.net 2015 The e-journal of nondestructive testing & ultrasonics 20 NDT-CE 2015 - International symposium non-destructive testing in civil engineering Berlin, Germany 15.09.2015 17.09.2015 11 1 9 urn:nbn:de:kobv:b43-345729 http://creativecommons.org/licenses/by-nd/3.0/de/ 2016-02-20 OPUS4-34608 Beitrag zu einem Tagungsband Alver, Ninel; Wiggenhauser, Herbert Modified SIBI application to scanning impact-echo Edinburgh Engineering Technics Pr., University of Edinburgh 2008 Structural faults & repair 2008 (Proceedings) 0-947644-63-5 12th International Conference and Exhibition "Structural Faults & Repair 2008" Edinburgh, Scotland 2008-06-10 2008-06-12 2016-02-20 OPUS4-34609 Beitrag zu einem Tagungsband Wiggenhauser, Herbert Büyüköztürk, O. Automated NDE of structures with combined methods Non-Destructive Evaluation (NDE) of structures is complex due to the uniqueness of almost all structures and their sizes. A single NDT method typically is not sufficient to meet the testing requirements, which cover different areas, such as material and structural properties. Measuring geometrical properties require other test methods than e.g. the detection of corrosion. Automation has proven to be necessary for aquiring large amounts a of high quality data in a short time. Examples of succesful method combinations from different areas of non-destructive testing in civil engineering are briefly described and their application is shown. Some of the examples also include automated inspection. Dordrecht Springer 2013 Nondestructive testing of materials and structures: Proceedings of NDTMS 2011 978-94-007-0722-1 International Symposium on Nondestructive Testing of Materials and Structures Istanbul, Turkey 15.05.2011 18.05.2011 6 753 760 10.1007/978-94-007-0723-8_107 2016-02-20 OPUS4-34610 Beitrag zu einem Tagungsband Wiggenhauser, Herbert Advanced NDT methods for quality assurance of concrete structures 2010 Proceedings of the national seminar on NDE 2010 National Seminar on NDE 2010 Kolkata, India 2010-12-09 2010-12-11 1 8 2016-02-20 OPUS4-34611 Beitrag zu einem Sammelband Reddy, K. M.; Kudalkar, V. N.; Madhusudan, C. P.; Wiggenhauser, Herbert A NDT in civil engineering software for multiple testing methods Oakland, CA, USA The American Society for Nondestructive Testing (ASNT) 2008 NDE/NDT for Highways and Bridges - Structural Materials Technology (SMT) 978-1-57117-180-1 295 302 2016-02-20 OPUS4-34620 Zeitschriftenartikel Krause, Martin; Mauke, R.; Effner, Ute; Milmann, Boris; Völker, Christoph; Wiggenhauser, Herbert Ultrasonic testing of a sealing construction made of salt concrete in an underground disposal facility for radioactive waste For the closure of radioactive waste disposal facilities engineered barriers- so called "drift seals" are used. The purpose of these barriers is to constrain the possible infiltration of brine and to prevent the migration of radionuclides into the biosphere. In a rock salt mine a large scale in-situ experiment of a sealing construction made of salt concrete was set up to prove the technical feasibility and operability of such barriers. In order to investigate the integrity of this structure, non-destructive ultrasonic measurements were carried out. Therefore two different methods were applied at the front side of the test-barrier: 1 Reflection measurements from boreholes 2 Ultrasonic imaging by means of scanning ultrasonic echo methods This extended abstract is a short version of an article to be published in a special edition of ASCE Journal that will briefly describe the sealing construction, the application of the non-destructive ultrasonic measurement methods and their adaptation to the onsite conditions -as well as parts of the obtained results. From this a concept for the systematic investigation of possible contribution of ultrasonic methods for quality assurance of sealing structures may be deduced. Kirchwald NDT.net 2015 The e-journal of nondestructive testing & ultrasonics 20 NDT-CE 2015 - International symposium non-destructive testing in civil engineering Berlin, Germany 2015-09-15 2015-09-17 11 1 4 urn:nbn:de:kobv:b43-346203 http://creativecommons.org/licenses/by-nd/3.0/de/ 2016-02-20 OPUS4-34574 Vortrag Wiggenhauser, Herbert A NDT in Civil Engineering Software for Multiple Testing Methods 2008 International Conference of NDE/NDT for Highways and Bridges, Structural Materials Technology (SMT) International Conference of NDE/NDT for Highways and Bridges, Structural Materials Technology (SMT) Oakland, CA, USA 2008-09-08 2008-09-12 2016-02-20 OPUS4-34580 Zeitschriftenartikel Millar, Steven; Wilsch, Gerd; Eichler, Thorsten; Gottlieb, Cassian; Wiggenhauser, Herbert Laser induced breakdown spectroscopy (LIBS) im Bauwesen - automatisierte Baustoffanalyse Die Laser induzierte Breakdown Spektroskopie (LIBS) bietet für die Analyse heterogener, mineralischer Baustoffe, wie z. B. Beton, deutliche Vorteile gegenüber konventionellen Methoden. Sie ermöglicht neben der Quantifizierung von Elementgehalten und -verteilungen im Baustoff auch die Differenzierung von Elementkonzentrationen innerhalb einzelner Phasen im Baustoff. So können beispielsweise die für die Alkali-Kieselsäure-Reaktion (AKR) interessanten Natriumkonzentrationen bestimmt und hinsichtlich ihrer Verteilung aufgelöst werden. Es lassen sich Natriumgehalte, welche sich in der Gesteinskörung befinden, separat von denen der Betonmatrix bestimmen. Der vorliegende Artikel befasst sich mit den Vor- und Nachteilen von LIBS als alternative Methode für die chemische Analyse von Baustoffen. Anhand von Beispielen aus der Praxis wird der derzeitige Stand der Technik dargestellt und ein Vergleich mit etablierten Messmethoden vorgenommen. Compared to conventional methods the Laser Induced Breakdown Spectroscopy (LIBS) provides significant advantages for analysis of heterogeneous, mineral building materials as e.g. concrete. Besides providing the possibility to quantify element concentrations and distributions in building materials, this technique enables also to differentiate concentrations within different phases of the material. It is possible to determine sodium concentrations and distribution directly, which e.g. is important when regarding Alkali-Silica-Reaction (ASR). Sodium contents provided by the aggregates can be distinguished from those provided by the concrete matrix. The present article is concerned with the advantages and disadvantages of LIBS as alternative method for chemical analysis of building materials. On the basis of samples from practice the current state of the art is shown and different measurement techniques will be compared. Berlin Ernst 2015 Beton- und Stahlbetonbau 110 8 501 510 10.1002/best.201500030 2016-02-20 OPUS4-34636 Beitrag zu einem Tagungsband Wiggenhauser, Herbert; Taffe, Alexander NDT in civil engineering: Research, application, validation and training 2012 18th WCNDT - World conference on nondestructive testing (Proceedings) 978-0-620-52872-6 18th WCNDT - World conference on nondestructive testing Durban, South Africa 2012-04-16 2012-04-20 1 13 2016-02-20 OPUS4-34642 Beitrag zu einem Tagungsband Mayer, K.; Krause, Martin; Wiggenhauser, Herbert; Milmann, Boris Investigations for the improvement of SAFT imaging quality of a large aperture ultrasonic system In parallel to the hardware development of an ultrasonic system for the investigation of thick concrete structures, a software package for interactive reconstruction of data for that special arrangement of ultrasonic transducers was developed. The system which is presented in a further contribution to this conference as "large aperture ultrasonic system" (LAUS) requires special features to the evaluation software because measuring positions can be in a non equidistant grid and there is the possibility to improve the measurement by adding measuring points interactively. Starting from theoretical considerations to the image generation by measuring arrangements of synthetic aperture problems, solution approaches for imaging with SAFT (Synthetic Aperture Focusing Technique) algorithms in space and frequency domain of data from insufficient grid density are presented. A wide range of issues that may arise in the application is precalculated by simulations and experimental studies, so that unavoidable artifacts can be identified and classified. A special focus is put on the application of thick concrete structures considering missing measuring points in a grid, grating lobes and surface waves. Technische Universität Berlin / Bundesanstalt für Materialforschung und -prüfung 2015 NDT-CE 2015 - International symposium non-destructive testing in civil engineering (Proceedings) NDT-CE 2015 - International symposium non-destructive testing in civil engineering Berlin, Germany 15.09.2015 17.09.2015 1026 1034 urn:nbn:de:kobv:b43-346421 http://creativecommons.org/licenses/by-nd/3.0/de/ 2016-02-20 OPUS4-35089 Vortrag Wiggenhauser, Herbert LAUS - LARGE APERTURE ULTRASONIC SYSTEM for testing thick concrete structures 2015 Abteilungsseminar der Abteilung 8 "Zerstörungsfreie Prüfung" Abteilungsseminar der Abteilung 8 "Zerstörungsfreie Prüfung" BAM, Berlin, Deutschland 2015-12-14 2015-12-14 2016-02-20 OPUS4-35097 Zeitschriftenartikel Wiggenhauser, Herbert; Niederleithinger, Ernst NDT-CE 2015: International symposium non-nestructive testing in civil engineering The legend continued: The International Symposium NonDestructive Testing in Civil Engineering (NDT-CE) had returned to Berlin. The Bundesanstalt für Materialforschung und -prüfung (BAM) and the Technical University of Berlin (TUB) hosted this prestigious event in the industrial landmark building Peter-Behrens-Halle and the Test Site Technical Safety (TTS) in Horstwalde in September 2015. Almost 300 participants from more than 35 countries gathered to present recent research, exchange knowledge and to lest the newest equipment in NDT-CE. This symposium, held regularly in various locations all over the world, was organized for the third time in Berlin and is by far the largest of its kind. Münster Deutsche Geophysikalische Gesellschaft 2015 Mitteilungen / Deutsche Geophysikalische Gesellschaft 3 53 54 2016-02-20 OPUS4-33174 Vortrag Wiggenhauser, Herbert Nondestructive Testing in Civil Engineering 2015 Golden Jubilee celebration of SERC Recent Advances in Structural Engineering Golden Jubilee celebration of SERC Recent Advances in Structural Engineering Chennai, Indien 2015-05-07 2015-05-08 2016-02-20 OPUS4-38743 misc Wiggenhauser, Herbert; Stoppel, Markus; Strangfeld, Christoph BETOSCAN - Parkdeck Multisensorik - selbst fahrendes Scannersystem für Betonflächendiagnosen BETOSCAN ist eine selbst fahrende und selbst navigierende Plattform für Sensoren und Messgeräte. Berlin Bundesanstalt für Materialforschung und -prüfung (BAM) 2016 1 3 urn:nbn:de:kobv:b43-387431 http://www.gesetze-im-internet.de/urhg/index.html 2016-12-20 OPUS4-44577 Vortrag Niederleithinger, Ernst; Wiggenhauser, Herbert; Milmann, Boris LAUS - Erste praktische Erfahrungen mit einem neuartigen Ultraschallsystem großer Eindringtiefe Konventionelle Systeme zur Ultraschall-Echo-Prüfung von Betonbauteilen sind in ihrer Eindringtiefe auf etwa einem Meter begrenzt. Zur Prüfung stärkerer Objekte war die Entwicklung eines neuartigen Prüfsystems notwendig. Das LAUS-System (Large Aperture UltraSound) besteht aus 12 einzelnen Arrays, die mit jeweils 32 Einzelprüfköpfen (Scherwellen, 25 - 50 kHz) als Sender oder Empfänger betrieben werden können. Sie werden unabhängig auf Betonoberflächen mit Unterdruck befestigt und kommunizieren drahtlos untereinander und mit der Zentraleinheit. Alle möglichen Kombinationen ergeben 132 Einzelmessungen, die zur Rekonstruktion des durchschallten Volumens genutzt werden. Mehrere dieser Datensätze lassen sich zu einer 3D-Auswertung kombinieren. Das System wurde an mehreren Testobjekten und Bauwerken erfolgreich erprobt. So konnte die fünf Meter dicke, sehr stark bewehrte Fundamentplatte des Fallturms auf dem BAM-Testgelände bei Horstwalde durchschallt werden. Ein zweites Beispiel ist die erfolgreiche Detektion von Spannkanälen in 1,8 m Tiefe in einem massiven Brückenbauwerk. 2018 Bauwerksdiagnose 2018 Berlin, Germany 15.2.2018 16.2.2018 2018-03-27 OPUS4-44578 Beitrag zu einem Tagungsband Niederleithinger, Ernst; Wiggenhauser, Herbert; Milmann, Boris LAUS - Erste praktische Erfahrungen mit einem neuartigen Ultraschallsystem großer Eindringtiefe Konventionelle Systeme zur Ultraschall-Echo-Prüfung von Betonbauteilen sind in ihrer Eindringtiefe auf etwa einem Meter begrenzt. Zur Prüfung stärkerer Objekte war die Entwicklung eines neuartigen Prüfsystems notwendig. Das LAUS-System (Large Aperture UltraSound) besteht aus 12 einzelnen Arrays, die mit jeweils 32 Einzelprüfköpfen (Scherwellen, 25 - 50 kHz) als Sender oder Empfänger betrieben werden können. Sie werden unabhängig auf Betonoberflächen mit Unterdruck befestigt und kommunizieren drahtlos untereinander und mit der Zentraleinheit. Alle möglichen Kombinationen ergeben 132 Einzelmessungen, die zur Rekonstruktion des durchschallten Volumens genutzt werden. Mehrere dieser Datensätze lassen sich zu einer 3D-Auswertung kombinieren. Das System wurde an mehreren Testobjekten und Bauwerken erfolgreich erprobt. So konnte die fünf Meter dicke, sehr stark bewehrte Fundamentplatte des Fallturms auf dem BAM-Testgelände bei Horstwalde durchschallt werden. Ein zweites Beispiel ist die erfolgreiche Detektion von Spannkanälen in 1,8 m Tiefe in einem massiven Brückenbauwerk. Berlin 2018 Berichtsband Fachtagung Bauwerksdiagnose 2018 Fachtagung Bauwerksdiagnose 2018 Berlin 15.2.2018 16.2.2018 Paper 16, 1 8 urn:nbn:de:kobv:b43-445786 https://creativecommons.org/licenses/by-nd/4.0/deed.de 2018-03-27 OPUS4-45218 Zeitschriftenartikel Terzioglu, T.; Karthik, M.; Hurlebaus, S.; Hueste, M.; Maack, Stefan; Wöstmann, Jens; Wiggenhauser, Herbert; Krause, M.; Miller, P.; Olson, L. Nondestructive evaluation of grout defects in internal tendons of posttensioned girders Post-tensioning systems provide safe and efficient construction solutions for long span bridges. Despite the improved grouting practices over the past decade, existing post-tensioning systems may have significant amount of grout defects, which could lead to corrosion of the strands. Condition assessment of post-tensioning systems is necessary to allow bridge owners to take timely, proactive actions to mitigate or prevent further Deterioration and unanticipated tendon failures. A detailed experimental study conducted to assess the performance of nondestructive evaluation techniques in detecting grout defects within internal tendons is presented herein. Nondestructive evaluation techniques that include Ground Penetrating Radar, Impact Echo, Ultrasonic Tomography, and Ultrasonic Echo are evaluated in terms of detecting the location and severity of fabricated grout defects in a full-scale post-tensioned U-girder mock-up specimen. While Ground Penetrating Radar can identify the location and profile of the internal tendons, particularly metal ducts due to strong reflections, this method did not provide any information about the defect conditions within the tendon. Both Impact Echo and Ultrasonic Echo techniques are effective in identifying the Location of grout defects, but could not differentiate between water, void, or compromised grout conditions. The study clearly demonstrates the need for NDE techniques that are applicable to anchorage regions, and that are capable of estimating the severity and nature of grout defects in internal tendons. Elsevier Ltd. 2018 NDT and E International 99 23 35 10.1016/j.ndteint.2018.05.013 2018-06-19 OPUS4-44132 misc Wiggenhauser, Herbert; Kind, Thomas; Mielentz, Frank; Strangfeld, Christoph; Völker, Christoph; Wilsch, Gerd Non-destructive testing in civil engineering at BAM Research and Development in Non-Destructive Testing in Civil Engineering at BAM has de-veloped over more than two decades. Highlights of present research are ultrasound phase array probes, ground penetrating radar applications for the assessment of existing structures and Laser Induced Breakdown Spec-troscopy (LIBS) to determine which chemical elements on the surface of a specimen are. RFID sensor devel-opments for wireless moisture monitoring and data fusion for the combined analysis of sensor data are fast developing areas. In addition, a selection of application cases is briefly described. Berlin 2017 Vortrag über die Aktivitäten des Fachbereichs 8.2 in der zerstörungsfreien Prüfung im Bauwesen. 1 10 2018-02-13 OPUS4-45736 Zeitschriftenartikel Wiggenhauser, Herbert; Köpp, Christian; Timofeev, Juri; Azari, H. Controlled creating of cracks in concrete for non-destructive testing The non-destructive assessment of cracks in concrete is a common task for which non-destructive evaluation solutions have been published. Primarily, these tests have been carried out on artificial cracks that have been created by using notches instead of natural cracks. This study evaluates a procedure designed to create reproducible and controlled cracks in concrete. The procedure is based on using expanding mortar in a series of blind holes. This is done in combination with carefully aligned reinforcement to guide the direction of the crack development. The depth of the crack is also controlled by reinforcement. Crack depth varies statistically in the range of the Maximum aggregate size (16 mm) used for concrete. New York Springer 2018 Journal of Nondestructive Evaluation 37 3 67, 1 9 urn:nbn:de:kobv:b43-457367 10.1007/s10921-018-0517-x https://creativecommons.org/licenses/by/4.0/deed.de 2018-08-20 OPUS4-51049 Forschungsbericht Wiggenhauser, Herbert; Helmerich, Rosemarie; Krause, Martin; Mielentz, Frank; Niederleithinger, Ernst; Taffe, Alexander; Wilsch, Gerd Naus, D. Non-destructive Testing of Nuclear Power Plant Concrete Structures State of the Art Report Nuclear Power Plants have been in operation for ca. 50 years. Based on this experience, non-destructive testing tasks specific to thick and highly reinforced nuclear containment structures have materialized. The performance based Service life extension of existing NPPs also needs a measurement based decision to support continuing the service of the concrete part of the installations. By nature, concrete is a very durable material and any natural Deterioration processes may take a long time to become critical to the structure. The experience of more than 50 years of service limits the testing tasks to a few ones which are not yet solved. Research in NDT of concrete structures is performed by many research institutions all over the world with different technical and systematic approaches. Results are mainly obtained on laboratory specimens, sometimes additional field studies are reported. This research takes place independently without coordination and as a result, the outcomes mostly lack full comparability. Software for data analysis has become indispensable and very powerful. This part of testing needs more attention when it comes to evaluate test results. Validation of NDE solutions is becoming a critical part in concrete structure testing. Validation is by definition the proof that a customer´s requirements in the test are being met by the testing solution. This includes equipment, personnel qualification and data analysis. In the following tables, the research recommendation Validation is used in the sense, that proof of the performance of existing solutions needs to be adressed. In general, a validation methodology for NDE solutions for concrete testing in itself needs to be researched and established. Comparability of research also needs an accepted and easily accessible reference. From experience, it is almost impossible to manufacture exact copies of test specimens at different locations. Round Robin tests are therefore needed to evaluate the performance of a test. Data evaluation is generally done using dedicated software, sometimes Hardware dependant and not interchangeable between systems. Software is ever more increasingly becoming more powerful and sophisticated. An in-depth evaluation needs to address the comparability and validation of Software used for data analysis and evaluation. The vision of a unified software pool for NDE investigations would undoubtedly support research tremendously. Quantitative NDE is mostly recommended to assess the condition of a structure. However, qualitative data can be very useful, especially for processes which change the material properties or deteriorate the structure (e.g. corrosion of reinforcement). The need for reliable baseline data is a key factor for such monitoring tasks. Berlin BAM 2013 BAM research report 1 120 2020-07-27 OPUS4-32967 Zeitschriftenartikel Wiggenhauser, Herbert; Naus, D.J. NDE of thick and highly reinforced concrete structures: state of the art The objective of the report is to present the state-of-the art of non-destructive testing methods and technologies for the inspection of thick, heavily-reinforced structures, (e.g. found in nuclear power plants). Wall thicknesses can be in excess of one meter and the structures often have increased steel reinforcement density. The accessibility for any testing method may be limited due to the presence of liners and other components such as cast-in-place items. Testing methods have to provide solutions for tasks such as locating failure (inclusions, corrosion, voids, delaminations) in the structures or the assessment of the condition of the structure in general. Amsterdam [u.a.] Elsevier 2014 Procedia engineering 86 420 426 urn:nbn:de:kobv:b43-329674 10.1016/j.proeng.2014.11.055 http://creativecommons.org/licenses/by-nc-nd/3.0/de/deed.de 2016-02-20 OPUS4-32998 Posterpräsentation Wiggenhauser, Herbert An Ultrasound Monitoring System For Concrete Structures 2014 Istanbul Bridge Conference Istanbul Bridge Conference Istanbul, Türkei 2014-08-11 2014-08-13 2016-02-20 OPUS4-32999 Vortrag Wiggenhauser, Herbert An Ultrasound Monitoring System For Concrete Structures 2013 The 6th Int. Conference on Structural Health Monitoring of Intelligent Infastructure The 6th Int. Conference on Structural Health Monitoring of Intelligent Infastructure Hong Kong, China 2013-12-09 2013-12-11 2016-02-20 OPUS4-35183 Vortrag Wiggenhauser, Herbert LAUS - LARGE APERTURE ULTRASONIC SYSTEM for testing thick concrete structures 2015 Ultrasonic Inspection of complex structured materials Ultrasonic Inspection of complex structured materials Ecuelles, Frankreich 2015-11-19 2015-11-20 2016-02-20 OPUS4-34465 Zeitschriftenartikel Niederleithinger, Ernst; Wolf, Julia; Mielentz, Frank; Wiggenhauser, Herbert Using embedded ultrasonic sensors for active and passive concrete monitoring Challenging new constructions and ageing infrastructure are increasing the demand for permanent monitoring of loads and condition. Various methods and sensors are used for this purpose. But the technologies available today have difficulties in detecting slowly progressing locally confined damages. Extensive investigations or instrumentations are required so far for this purpose. In this study we present new sensors and data processing methods for ultrasonic transmission, which can be used for non-destructive long term monitoring of concrete. They can be mounted during construction or thereafter. Larger volumes can be monitored by a limited number of sensors for changes of material properties. The principles of ultrasonic transmission and influencing factors are presented. This latter include load, damages as well as environmental parameters as temperature or moisture. Various methods for data processing, e. g. coda wave interferometry are introduced. They allow the detection of very small changes in the medium. The embedded sensors are shown including mounting and operation. Application examples so far include small scale laboratory freeze-thaw experiments, localizing loads in larger concrete models, monitoring load effects on real structures as well as detecting acoustic events. Some sensors are operating already for several years. The sensors can be used as transmitter or receivers or switched between both roles. While most of the previous experiments have been active (at least one sensor serving as transmitter), new studies show that the sensors are useful as well for passive measurements, e. g. in acoustic emission or time reversal experiments. Besides application in civil engineering our setups can also be used for model studies in geosciences. Kirchwald NDT.net 2015 The e-journal of nondestructive testing & ultrasonics 20 NDT-CE 2015 - International symposium non-destructive testing in civil engineering Berlin, Germany 15.09.2015 17.09.2015 11 1 4 urn:nbn:de:kobv:b43-344652 http://creativecommons.org/licenses/by/3.0/de/deed.de 2016-02-20 OPUS4-34732 Forschungsbericht Gucunski, N.; Imani, A.; Romero, F.; Nazarian, S.; Yuan, D.; Wiggenhauser, Herbert; Shokouhi, Parisa; Taffe, Alexander; Kutrubes, D. Nondestructive testing to identify concrete bridge deck deterioration This work was sponsored by the Federal Highway Administration in cooperation with the American Association of State Highway and Transportation Officials. It was conducted in the second Strategic Highway Research Program (SHRP 2), which is administered by the Transportation Research Board of the National Academies. The project was managed by Monica Starnes, Senior Program Officer for SHRP 2 Renewal. The research reported herein was performed by the Center for Advanced Infrastructure and Transportation (CAIT) at Rutgers University (RU); the Center for Transportation Infrastructure Systems (CTIS) at The University of Texas at El Paso (UTEP); the Federal Institute for Materials Research and Testing (BAM), Germany; and Radar Systems International, Inc. (RSI). Rutgers University was the coordinator and contractor for this project. Dr. Nenad Gucunski, professor and chair of Civil and Environmental Engineering and director of CAIT's Infrastructure Condition Monitoring Program at RU, was the principal investigator. The other authors of this report are Dr. Soheil Nazarian, professor of Civil Engineering and director of CTIS at UTEP; Dr. Deren Yuan, research associate at CTIS at UTEP; Dr. Herbert Wiggenhauser, head of Non-Destructive Testing (NDT) in Civil Engineering at BAM; Dr. Alexander Taffe, leader of Combination and Automation of NDT of Buildings at BAM; Dr. Parisa Shokouhi, Alexander von Humboldt Research Fellow, hosted by BAM; and Doria Kutrubes, president of RSI. Arezoo Imani and Touraj Tayebi, graduate research assistants at RU, helped conduct the validation testing, data analysis, and web manual content preparation. Hoda Azari, a graduate research assistant, and Dr. Manuel Celaya, a research engineer at UTEP, assisted in the validation study as well. Hooman Parvardeh, research assistant at RU, helped build the reference database and develop the framework for the web manual, while Erica Erlanger, a research staff member at RU, edited the manuscript. Their contributions are gratefully acknowledged. The research team also gratefully acknowledges contributions of the participants from industry and academia in the validation testing. The participants include NDT Corporation; Germann Instruments; Olson Engineering; Dr. Ralf Arndt, National Research Council associate at FHWA Turner-Fairbank Highway Research Center; Ingegneria Dei Sistemi S.p.A. (IDS), Italy; 3D-RADAR, Norway; Dr. John Popovics, University of Illinois at Urbana-Champaign; Dr. Jinying Zhu, The University of Texas at Austin; Rutgers University—Center for Advanced Infrastructure and Transportation; and The University of Texas at El Paso—Center for Transportation Infrastructure Systems. The contributions of these participants were critical for the evaluation and grading of the performance of NDT technologies. Transportation Research Board, Washington D.C. National Academy of Sciences 2013 SHRP 2 Report S2-R06A-RR-1 978-0-309-12933-6 1 96 2016-02-20 OPUS4-34933 Beitrag zu einem Tagungsband Wiggenhauser, Herbert; Reinhardt, H.W. Thompson, D.O.; Chimenti, D.E. NDT in civil engineering: experience and results of the FOR 384 research group Melville, NY American Institute of Physics 2010 QNDE conference 2010 - Review of progress in quantitative nondestructive evaluation (Proceedings) 29 978-0-7354-0748-0 36th Annual Review of Progress in Quantitative Nondestructive Evaluation Kingston, RI, USA 2009-07-26 2009-07-31 47 54 2016-02-20 OPUS4-31204 Beitrag zu einem Tagungsband Niederleithinger, Ernst; Sens-Schönfelder, C.; Grothe, Sven; Wiggenhauser, Herbert Coda wave interferometry used to localize compressional load effects on a concrete specimen Coda Wave Interferometry (CWI), a method to evaluate subtle changes of elastic wave velocity in a medium, has been proven to be effective to detect small changes or ultrasonic velocity in concrete caused by load, temperature, moisture, damage or other means. While classical CWI is just able to determine velocity changes globally in relatively large areas between and around pairs of transmitters and receivers, several approaches have been proposed to identify the area affected by the changes more precisely. Most of them are based on the calculation of sensitivity kernels for de-correlation of signals measured at a specific state against a reference. Others follow simplified approaches. In a laboratory setup a concrete specimen of 1:5 x 1:5 x 0:5 m3 was compressed at a certain point. Maximum loads of 20 to 100 kN have been applied in 5 to 10 kN steps in various cycles. The specimen is equipped with 18 embedded ultrasonic broadband piezo transceivers (60 kHz central frequency). Ten of these receivers have been connected to a multiplexer and ultrasonic transmitting and receiving equipment in a way that allowed almost continuous two way measurements between all sensor pairs. Even simple ways to evaluate the data (e.g. crosscorrelation between signals at different load states) allowed pinpointing the load center at least approximately. A more detailed data evaluation either using CWI or even more one of the more sophisticated localization algorithms gave "sharper" results in terms of localization and a better correlation between load and velocity change/de-correlation. The results are used in upcoming monitoring systems for concrete structures. 2014 7th European workshop on structural health monitoring 7th European workshop on structural health monitoring Nantes, France 08.07.2014 11.07.2014 Paper WeBT6.3, 1427 1433 2016-02-20 OPUS4-40236 Vortrag Wiggenhauser, Herbert FA ZfPBau - Welches sind die Zukunftsthemen? Vortrag über die bisherige Arbeit des Fachausschusses ZfP im Bauwesen und über mögliche zukünftige Themenfelder. 2017 FA ZfP im Bauwesen Berlin, Germany 11.05.2017 12.05.2017 2017-05-15 OPUS4-43486 Zeitschriftenartikel Dackermann, U.; Yu, Y.; Niederleithinger, Ernst; Li, J.; Wiggenhauser, Herbert Condition Assessment of Foundation Piles and Utility Poles Based on Guided Wave Propagation Using a Network of Tactile Transducers and Support Vector Machines This paper presents a novel non-destructive testing and health monitoring system using a network of tactile transducers and accelerometers for the condition assessment and damage classification of foundation piles and utility poles. While in traditional pile integrity testing an impact hammer with broadband frequency excitation is typically used, the proposed testing system utilizes an innovative excitation system based on a network of tactile transducers to induce controlled narrow-band frequency stress waves. Thereby, the simultaneous excitation of multiple stress wave types and modes is avoided (or at least reduced), and targeted wave forms can be generated. The new testing system enables the testing and monitoring of foundation piles and utility poles where the top is inaccessible, making the new testing system suitable, for example, for the condition assessment of pile structures with obstructed heads and of poles with live wires. For system validation, the new system was experimentally tested on nine timber and concrete poles that were inflicted with several types of damage. The tactile transducers were excited with continuous sine wave signals of 1 kHz frequency. Support vector machines were employed together with advanced signal processing algorithms to distinguish recorded stress wave signals from pole structures with different types of damage. The results show that using fast Fourier transform signals, combined with principal component analysis as the input feature vector for support vector machine (SVM) classifiers with different kernel functions, can achieve damage classification with accuracies of 92.5% ± 7.5%. Basel, Schweiz MDPI 2017 Sensors 17 12 Article 2938, 1 16 urn:nbn:de:kobv:b43-434868 10.3390/s17122938 http://creativecommons.org/licenses/by/3.0/de/deed.de 2017-12-19 OPUS4-39372 Zeitschriftenartikel Wiggenhauser, Herbert; Samokrutov, A; Mayer, K; Krause, Martin; Alekhin, S. G.; Elkin, V Large aperture ultrasonic system for testing thick concrete structures A Large Aperture UltraSonic system (LAUS) has been designed and built for testing thick concrete structures. The scalable system consists of twelve ultrasonic units, each hosting 32 individual shear wave transducers with mechanical dry point contact (DPC) to the concrete surface. The twelve units are attached to the concrete surface using a vacuum case which holds them in place during operation. Each LAUS unit can be placed individually on the surface to achieve optimal ultrasonic condition, e.g. to avoid rebars. For the generation of vacuum, air pressure is supplied to each unit through an air hose. The twelve units define an aperture which is necessary for fast reconstruction of the subsurface structure. The well-known SAFT (Synthetic Aperture Focusing Technique) algorithm has been adopted to this situation, where the individual LAUS units form a linear aperture with not necessarily equidistant spacing between the units. The exact geometrical position of the units, which are individually marked with retroreflective labels, is determined using photographs and image processing. All transducers are synchronized and work either as transmitter or receiver. A full scan consists of 12 * 11 recordings, where each unit acts as transmitter once and all others as receivers. An electronic sub-unit on the back of the ultrasonic device holds the battery and handles data acquisition, synchronization and data communication. A computer is used as base unit which communicates with each LAUS unit for control and data acquisition, the synchronization is performed by a radio modem that uses a special algorithm similar to a digital PLL (phase locked loop). No wire connections are necessary between the units and the base system. The LAUS system is designed to investigate concrete structures with thicknesses in excess of 2 m, depending on the acoustic condition of the object under investigation. Highly reinforced concrete may have less penetration depth. The LAUS provides quasi real time imaging, once the transducers are put in place and the data has been acquired. First measurements on a foundation slab confirm, that the system can register ultrasonic echoes from the back wall at 4 m distance. Reston, VA 20191-4400 USA American Society of Civil Engineers (ASCE) 2017 Journal of Infrastructure Systems 23 1 B4016004-1 B4016004-9 10.1061/(ASCE)IS.1943-555X.0000314 2017-03-28 OPUS4-39375 Buchkapitel Sousa, J.; Wiggenhauser, Herbert Bittencourt, Frangopol & Beck, Application of a cross correlation technique for assessment of a non-homogeneous stress field Many researchers have addressed the determination of a homogeneous stress field from the analysis of ultrasound waves, using the theory of acoustoelasticity with Murnaghan´s constants derived for axially loaded specimens with the ultrasound wave path also in the axial direction, or for hydrostatically loaded specimens. However, the use of such strategy for structural healthy monitoring requires the ability to handle nonhomogeneous, arbitrarily oriented stress fields. This paper describes an attempt to evaluate changes in the stress field of a concrete block with an eccentrically placed tendon through acoustoelastic analysis. Pairs of acoustic transducers are placed on the surfaces such that wave paths are parallel to the tendon. A cross correlation technique is used for the accurate assessment of the sound velocity changes, and subsequent application of Murnaghan´s equations for assessing the stress changes. Results are promising with respect to the evaluation for non-homogeneous stress field from ultra sound velocities. London Taylor & Francis Group 2016 Maintenance, Monitoring, Safety, Risk and Resilience of Bridges and Bridge Networks 978-1-138-02851-7 237 237 2017-03-15 OPUS4-39661 Posterpräsentation Niederleithinger, Ernst; Wiggenhauser, Herbert; Mielentz, Frank; Bertschat, Anja-Sophie; Mierschke, Vivien; Werner, Andreas Untersuchung von Veränderungen in Beton mit Ultraschall-Codawelleninterferometrie Die Coda transmittierter Ultraschallsignale in Beton enthält Informationen zu Struktur und Zustand des Materials bzw. deren Änderung. Relevant sind u. a. Temperatur, Stress, Feuchtigkeit und verschiedene Schädigungsmechanismen. Die zahlreichen Einflussfaktoren sind nur schwer zu trennen und die Messeffekte oft zu Beginn sehr klein.Die CWI ermöglicht die Detektion kleinster Geschwindigkeitsveränderungen durch den Vergleich, der in kleinen Schritten gestauchten oder gestreckten Signalen mit eine Referenzmessung. Andere Indikatoren für Änderungen im Material sind: • Kreuzkorrelation • Laufzeit direkte Welle • Energie/Amplitude • Änderungen im Frequenzspektrum Die beschriebene Technik wird von uns bisher primär in klein- und großskaligen Laborversuchen genutzt. Die Forschung konzentriert sich auf die Untersuchung und Trennung verschiedener Einflusseffekte. Aber auch erste reale Bauwerke wurden schon instrumentiert, z. B. Brücken und eine Tunneldecke. 2017 77. Jahrestagung der Deutschen Geophysikalischen Gesellschaft Potsdam, Germany 27.03.2017 30.03.2017 2017-04-05 OPUS4-39629 Vortrag Wiggenhauser, Herbert Acoustic and electromagnetic waves in nondestructive testing in civil engineering Research and Development; Application of NDT for Civil Structures; Reference Specimen; Validation of Testing Solutions; Standardization; Training; Structural Investigation (thickness, location of elements, cracks, ...); Material Properties (strength, composition, moisture, …) 2017 WAVES Workshop Cambridge Cambridge, UK 26.03.2017 29.03.2017 2017-04-03 OPUS4-40609 Zeitschriftenartikel Wiggenhauser, Herbert; Azari, H. Classification of nondestructive evaluation tasks for reinforced concrete structures Abstract: Nondestructive evaluation (NDE) methods have received growing acceptance in many testing tasks in the assessment of concrete infrastructures. Substantial progress in NDE methods for concrete structures can be achieved by discussing the specifics of each testing scenario. Because of the large variety of testing scenarios, the testing tasks must be isolated into subtasks, which can then be solved by NDE methods. A classification scheme for NDE tasks is described and discussed in this paper. Four major groups have been identified: the construction process, the concrete structure, physical or chemical processes, and material properties. For each of these groups, a number of subtasks are described. Typical parameter ranges and Resolution requirements are illustrated and major influencing factors listed. Reference specimens may be designed to be used for performance evaluation, validation, and certification of NDE methods. The classifications can also be used to draft a research road map that benefits both the owners of infrastructure and the instrument developers. ASCE 2017 Journal of Infrastructure Systems 23 4 04017021-1 04017021-8 10.1061/(ASCE)IS.1943-555X.0000378 2017-06-15 OPUS4-47238 Beitrag zu einem Tagungsband Niederleithinger, Ernst; Wiggenhauser, Herbert The LAUS: First Applications of a New System for Ultrasonic Imaging of Very Concrete Structures The LAUS (Large Aperture Ultrasonic System) has been developed to image very thick concrete structures, which are not accessible for commercial systems. The device and the corresponding software is the result of joint Research of BAM, an ultrasonic instrument manufacturer and University of Kassel, Germany. It consists of 12 separate Arrays of 32 point-contact shear wave transducers each, which can be deployed in flexible configurations. Each array is combined with battery and transmitter, receiver and wireless communication electronics. Three case histories are presented. First the system was deployed on a 5-m thick heavily reinforced foundation slab. The reflection of the slab's bottom was imaged clearly. In addition, a multiple reflection was registered, thus giving hope that even thicker elements might be imaged by the instrument. Second, the LAUS was used to investigate a massive bridge girder where a heavy rainstorm during concreting had led to imperfections that were visible after removing the formwork was removed. The LAUS could image tendon ducts in 1.8m depth and the backwall closely behind them. Some limited areas showed blurred reflections and were checked by drill holes; these areas were affected by diffuse damage which could be repaired by injections. Third, a large retaining wall was checked for thickness. Meanwhile, the LAUS has been used in underground waste deposits (nuclear and other) for quality assurance of sealing plugs. A confirmed penetration depth of about 7 m has been reached. Columbus, OH, USA The American Society for Nondestructive Testing, Inc. 2019 2018 SMT Proceedings 11/19 978-1-57117-456-7 SMT and NDT-CE 2018 New Brunswick, NJ, USA 27.08.2018 29.08.2018 208 213 2019-01-24 OPUS4-42614 Zeitschriftenartikel Wiggenhauser, Herbert; Niederleithinger, Ernst; Milmann, Boris Zerstörungsfreie Ultraschallprüfung dicker und hochbewehrter Betonbauteile Ein Ultraschallsystem mit großer Apertur, genannt LAUS - Large Aperture UltraSound, wird vorgestellt und die technischen Eigenschaften erläutert. Es besteht aus zwölf Prüfköpfen, die beliebig auf Betonoberflächen mit Unterdruck befestigt und jeweils als Sender oder Empfänger genutzt werden. Alle möglichen Kombinationen ergeben 132 Einzelmessungen, die zur Rekonstruktion des durchschallten Volumens genutzt werden. Das System wurde an zwei Bauwerken erfolgreich erprobt. Die Dicke einer sehr stark bewehrten Fundamentplatte eines Fallturms wurde bestimmt. Die Messungen erfolgten in einem Raster auf einer Fläche von 2,0 × 1,8 m2 und die Rückseite konnte eindeutig abgebildet werden. Weitere Anzeigen aus dem Inneren der Platte zeigen das Potenzial des Systems. An einem Brückenbauwerk wurden indirekt Verdichtungsmängel lokalisiert. Dazu wurden mit dem LAUS-System die im Brückenträger verlaufenden Spannkanäle durch fast 2 m Beton abgebildet. Berlin Ernst & Sohn 2017 Bautechnik 94 10 682 688 10.1002/bate.201700040 2017-10-24 OPUS4-42618 Zeitschriftenartikel Wiggenhauser, Herbert Bauwerksdiagnostik - Indikatoren für die Zukunft Vor dem Hintergrund der alternden Verkehrsinfrastruktur und des großen Bauwerksbestands allgemein gewinnt deren Zustandserfassung an Bedeutung. Durch die Einführung von Bauwerksmanagementsystemen und die Digitalisierung der Wirtschaft im Rahmen von Industrie 4.0 wird diese Entwicklung noch mehr Dynamik entfalten. Die Vernetzung von Zustandsdaten mit der Belastung, Wartung und Instandsetzung sowie der politischen Planung, wird eine hohe Bedeutung bekommen. Angesichts der Altersstruktur der Verkehrsinfrastruktur und begrenzter öffentlicher Gelder wird zukünftig eine selektive Instandsetzung von Bauwerken nach deren Zustandsnoten notwendig sein. Zerstörungsfreie Untersuchungsverfahren für Bauwerke nehmen in diesem Kontext eine wichtige Rolle ein, sie sollen die quantitativen Zustandsdaten erbringen und in die Datenbanken für Managementsysteme mit zuverlässigen und objektiven Messdaten füllen. Berlin Ernst & Sohn 2017 Bautechnik 94 10 675 675 10.1002/bate.201771003 2017-10-24 OPUS4-41256 Vortrag Wiggenhauser, Herbert Non-destructive testing in civil engineering at BAM Non-Destructive assessment of the National Infrastructure in Germany has been the topic of R&D at BAM since many years. In 1989 BAM has established a R&D group dedicated to the development and application of Non-Destructive Testing in Civil Engineering. Since then, this group has left has participated in numerous research projects and cooperated with many researches and institutes worldwide. A complex system of inspection and maintenance is in place to inspect and maintain roads, bridges, tunnels and other installations. Based on visual inspection structures like bridges are inspected regularly. In case of concerns which cannot be resolved in this process, a procedure "Object Oriented Damage Analysis" has been put into place where additional inspection methods, especially NDT methods, are being utilized. NDT methods to establish material properties such as strength, porosity, moisture, carbonation, etc need more attention to strengthen the links between engineers and inspectors. BAM and TU Berlin have established a joint Junior Professor to address this research area with gravity. Research is currently focused on methods, data, validation, certification and standardization. Industry 4.0 has become a widely discussed topic with unforeseeable impact. Current research topics include - Large Aperture UltraSound (LAUS) to evaluate very thick concrete elements (> 1m) - Embedded ultrasound sensors to monitor changes in concrete - Data fusion algorithms for honeycomb detection, corrosion localization and reinforcement diameter determination - Reverse Time Migration to improve imaging of concrete structures - Laser Induced Breakdown Spectroscopy (LIBS) with new applications, improved sensitivity and resolution, new devices - RFID based humidity and corrosion sensors - Analysis of scattered Radar waves for the classification of concrete - Development of reference specimens for selected NDT tasks The presentation will present examples of current research and ideas for research directions. 2017 FHWA Seminar Washington, D.C., USA 25.07.2017 2017-08-09 OPUS4-42203 Vortrag Wiggenhauser, Herbert Nondestructive testing in civil engineering Vortrag über die Aktivitäten des Fachbereichs 8.2 in der zerstörungsfreien Prüfung im Bauwesen. 2017 7th international Workshop on Structural Life Management of Eco-Power Structures Daejeon, Korea 20.09.2017 22.09.2017 2017-09-28 OPUS4-42204 Zeitschriftenartikel Wiggenhauser, Herbert Non-Destructive Testing in Civil Engineering Preface to Special Collection of coutributions to the International Symposium NDT-CE 2015 in Berlin/ Germany. 2017 Journal of Infrastructure Systems 23 4 02017001-1 10.1061/(ASCE)IS.19-555X.0000398 2017-09-28 OPUS4-41810 Vortrag Wiggenhauser, Herbert Application of NDT to nuclear structures The presentation is #4 of the lecture series within the CE5390 NDT&E Course at the "University of Texas at El Paso", USA (UTEP): 1. Application of NDT to Transportation Infrastructure 2. Application of NDT to Pavements 3. Application of NDT to Tunnels 4. Application of NDT to Nuclear Structures 5. Ultrasonic Methods 6. Electrical Resistivity (ER) 7. Galvanostatic Pulse Measurement (GPM) 8. Half-Cell Potential (HCP) 9. Ground Penetrating Radar (GPR) to Infrastructure 10. Ground Penetrating Radar (GPR) to Pavements 11. Impact Echo (IE)/Ultrasonic Surface Waves (USW) 12. Infrared Thermography (IR) 13. Magnetic Flux Leakage (MFL) 14. Ultrasonic Tomography (UST) 15. Falling Weight Deflectometer/Light Weight Deflectometer 16. Spectral Analysis of Surface Wave 17. Traffic Speed Deflectometer 18. Integrity of Foundations 19. Integration of Technologies Applications of NDT for nuclear structures are presented with an overview over the special challenges for NDE in this area. The lecture was held as a webinar on August 29, 2017 2017 Webinar UTEP CE 5390 Special Topics Civil Engineering Berlin, Germany 31.08.2017 2017-09-01