TY - RPRT A1 - Streicher, Doreen A1 - Algernon, Daniel A1 - Behrens, Matthias A1 - Kohl, Christoph A1 - Wöstmann, Jens A1 - Wiggenhauser, Herbert A1 - Petz, J. T1 - Großflächige ZfPBau-Untersuchungen an Hohlkastenbrücken der A 23 - Südosttangente Wien N2 - 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. T3 - BAM Forschungsberichtreihe - 278 PY - 2006 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-1735 SN - 978-3-86509-529-1 SN - 0938-5533 VL - 278 SP - 1 EP - 46 PB - Wirtschaftsverlag NW CY - Bremerhaven AN - OPUS4-173 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Köhler, B. A1 - Schubert, F. A1 - Algernon, Daniel A1 - Gardei, André A1 - Mielentz, Frank A1 - Krause, Martin ED - Thompson, D. O. T1 - Experimental study of elastic waves in concrete for NDE in civil engineering N2 - Laser vibrometric contactless sound field measurements at a concrete test block are presented. Both excitation by an ultrasonic probe and by an impactor were used. The wave modes can be identified by their geometric wave forms and propagation velocities. Additionally, numerical simulation of the experimental situation is used to support this interpretation. Possible applications of the presented technique are discussed. ©2005 American Institute of Physics T2 - 31th Annual Review of Progress in Quantitative Nondestructive Evaluation CY - Golden, CO, USA DA - 2004-07-25 KW - Ultraschall KW - Impact-Echo KW - Wellenausbreitung KW - Visualisierung KW - Modellierung PY - 2005 SN - 0-7354-0245-0 DO - https://doi.org/10.1063/1.1916840 SN - 0743-0760 SN - 0094-243X N1 - Serientitel: AIP conference proceedings – Series title: AIP conference proceedings IS - 760 SP - 1439 EP - 1445 PB - American Institute of Physics CY - Melville, NY AN - OPUS4-5480 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Streicher, Doreen A1 - Algernon, Daniel A1 - Kohl, Christoph A1 - Krause, Martin A1 - Maierhofer, Christiane A1 - Wiggenhauser, Herbert ED - Cruz, P. ED - Frangopol, D. T1 - Development and combined application of NDT echo-methods for the investigation of post tensioned concrete bridges T2 - 3rd International Conference on Bridge Maintenance, Safety and Management - "Bridge Maintenance, Safety, Management, Life-Cycle Performance and Cost" CY - Porto, Portugal DA - 2006-07-16 KW - Brückenuntersuchung KW - ZfP-Bau-Verfahren PY - 2006 SN - 0-415-40315-4 N1 - Serientitel: Balkema proceedings and monographs in engineering, water and earth sciences – Series title: Balkema proceedings and monographs in engineering, water and earth sciences SP - 1 EP - 8(?) PB - Taylor & Francis CY - London AN - OPUS4-13866 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Streicher, Doreen A1 - Algernon, Daniel A1 - Wöstmann, Jens A1 - Behrens, Matthias A1 - Wiggenhauser, Herbert T1 - Automated NDE of post-tensioned concrete bridges using imaging echo methods T2 - International Conference on Bridges, "Bridges" CY - Dubrovnik, Croatia DA - 2006-05-21 KW - Automated NDE KW - Imaging echo methods KW - Radar KW - Impact-echo KW - Ultrasonic echo KW - PT concrete bridges PY - 2006 SN - 3-931381-86-2 SP - 985 EP - 992 PB - European Federation for Non-Destructive Testing CY - Berlin AN - OPUS4-13867 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Algernon, Daniel A1 - Wiggenhauser, Herbert T1 - Anwendung der Hilbert-Huang-Transformation zur Auswertung von Impact-Echo-Datensätzen T2 - Jahrestagung der Deutschen Gesellschaft für Zerstörungsfreie Prüfung (DGZfP) 2005 CY - Rostock, Germany DA - 2005-05-02 PY - 2005 AN - OPUS4-11413 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Algernon, Daniel A1 - Wiggenhauser, Herbert T1 - Identification of short transient signals within impact-echo data using the Hilbert Huang transform T2 - IIIrd Workshop of "NDT in Progress" CY - Prague, Czech Republic DA - 2005-10-10 PY - 2005 AN - OPUS4-11414 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Algernon, Daniel A1 - Wiggenhauser, Herbert T1 - Experimental investigation of the acoustic wave propagation in concrete structures after impact excitation T2 - IIIrd Workshop of "NDT in Progress" CY - Prague, Czech Republic DA - 2005-10-10 PY - 2005 AN - OPUS4-11415 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Algernon, Daniel A1 - Wiggenhauser, Herbert T1 - Application of Hilbert-Huang Transform for the Analysis of Impact-Echo Signals T2 - Review of Progress in Quantitative NDE, Bowdoin College CY - Brunswick, ME, USA DA - 2005-07-31 PY - 2005 AN - OPUS4-11416 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Algernon, Daniel A1 - Wiggenhauser, Herbert A1 - Abraham, O. T1 - Scanning impact-echo for the investigation of tendon ducts in concrete T2 - Workshop of COST on NDT Assessment and New Systems in Prestressed Concrete Structures DA - 2005-09-18 PY - 2005 SP - 55 EP - 62 AN - OPUS4-11051 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Algernon, Daniel A1 - Wiggenhauser, Herbert T1 - Impact-Echo Data Analysis Based on the Hilbert-Huang Transform T2 - TRB 86th Annual Meeting CY - Washington, D.C., USA DA - 2007-01-21 KW - Impact-Echo KW - Hilbert-Huang KW - Transformation PY - 2007 SP - 1 EP - 14 CY - Washington, D.C., USA AN - OPUS4-17469 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Algernon, Daniel A1 - Wiggenhauser, Herbert T1 - Impact-echo data analysis based on the Hilbert-Huang transform T2 - TRB 86th Annual Meeting CY - Washington, D.C., USA DA - 2007-01-21 PY - 2007 AN - OPUS4-17462 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Beutel, R. A1 - Reinhardt, H.-W. A1 - Grosse, C.U. A1 - Glaubitt, A. A1 - Krause, Martin A1 - Maierhofer, Christiane A1 - Algernon, Daniel A1 - Wiggenhauser, Herbert A1 - Schickert, M. T1 - Comparative performance tests and validation of NDT methods for concrete testing N2 - 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. KW - Performance demonstration KW - Non-destructive testing KW - Concrete KW - Radar KW - Ultrasound KW - Impact-echo PY - 2008 DO - https://doi.org/10.1007/s10921-008-0037-1 SN - 0195-9298 SN - 1573-4862 VL - 27 IS - 1-3 SP - 59 EP - 65 PB - Plenum Press CY - New York, NY AN - OPUS4-17925 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Algernon, Daniel A1 - Gräfe, Boris A1 - Mielentz, Frank A1 - Köhler, B. A1 - Schubert, F. T1 - Imaging of the Elastic Wave Propagation in Concrete Using Scanning Techniques: Application for Impact-Echo and Ultrasonic Echo Methods N2 - Acoustic NDT methods like ultrasonic echo and impact-echo are successfully used for NDT of concrete structures. This paper describes useful techniques for a detailed experimental study of the elastic wave propagation, which is highly relevant for the interpretation of the results obtained from practical measurement applications. By using a scanning laser vibrometer it becomes possible to obtain a 2D visualization of the elastic waves propagating along the surfaces of concrete specimens. Time slices are prepared so that the wave field becomes apparent. In order to visualize especially the surface wave propagation a similar technique using a scanning system with a piezoelectric sensor is applied. The results obtained provide an appropriate basis for the comparison with numerical results from 3-D Elastodynamic finite integration technique (EFIT) calculations, which is demonstrated here. Examples are presented for the application with phased array ultrasonic echo, air-coupled ultrasonic echo and impact-echo. KW - Ultrasonic-echo KW - Impact-echo KW - Laser vibrometer KW - Visualization of wave propagation KW - Elastodynamic finite integration technique (EFIT) PY - 2008 UR - http://www.springerlink.com/content/v739785102l6367x/fulltext.pdf DO - https://doi.org/10.1007/s10921-008-0034-4 SN - 0195-9298 SN - 1573-4862 VL - 27 IS - 1-3 SP - 83 EP - 97 PB - Plenum Press CY - New York, NY AN - OPUS4-18031 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Algernon, Daniel A1 - Wiggenhauser, Herbert A1 - Schubert, F. T1 - Impact-echo: experimental and numerical study of acoustic wave propagation T2 - 2006 NDE Conference on Civil Engineering CY - St. Louis, MO, USA DA - 2006-08-14 PY - 2006 AN - OPUS4-14071 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Algernon, Daniel A1 - Wiggenhauser, Herbert T1 - Impact-echo signal processing T2 - 2006 NDE Conference on Civil Engineering CY - St. Louis, MO, USA DA - 2006-08-14 PY - 2006 AN - OPUS4-14072 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Algernon, Daniel A1 - Schubert, F. A1 - Wiggenhauser, Herbert T1 - A new approach for the investigation of geometry effects in impact-echo measurements - experimental results and numerical simulations T2 - ECNDT Berlin 2006, 9th European Conference on NDT CY - Berlin, Germany DA - 2006-09-25 PY - 2006 AN - OPUS4-14073 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Algernon, Daniel A1 - Schubert, F. A1 - Wiggenhauser, Herbert T1 - Impact-Echo: Experimental and Numerical Study of Acoustic Wave Propagation T2 - NDE Conference on Civil Engineering CY - St. Louis, Missouri, USA DA - 2006-08-14 KW - Impact-Echo KW - Nondestructive Testing KW - Geometry Effects KW - EFIT PY - 2006 SN - 1-57117-148-7 SP - 215 EP - 222 PB - ASTM CY - St. Louis AN - OPUS4-14123 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Algernon, Daniel A1 - Wiggenhauser, Herbert T1 - Impact-Echo Signal Processing T2 - NDE Conference on Civil Engineering CY - St. Louis, Missouri, USA DA - 2006-08-14 KW - Impact-Echo KW - Nondestructive Testing KW - Geometry Effects KW - EFIT PY - 2006 SN - 1-57117-148-7 SP - 207 EP - 214 PB - ASTM CY - St. Louis AN - OPUS4-14126 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Beutel, R. A1 - Reinhardt, H.-W. A1 - Grosse, C. U. A1 - Glaubitt, A. A1 - Krause, Martin A1 - Maierhofer, Christiane A1 - Algernon, Daniel A1 - Wiggenhauser, Herbert A1 - Schickert, M. T1 - Performance Demonstration of Non-Destructive Testing Methods T2 - 9th European Conference on NDT CY - Berlin, Germany DA - 2006-09-25 KW - NDT-CE KW - Concrete KW - Ultrasonic echo KW - Impact-echo KW - Radar KW - Concrete cover of tendon ducts KW - Thickness measurement KW - Concrete slabs PY - 2006 SN - 3-931381-86-2 SP - 1(?) EP - 9(?) PB - European Federation for Non-Destructive Testing CY - Berlin AN - OPUS4-14382 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CHAP A1 - Beutel, R. A1 - Reinhardt, H.-W. A1 - Große, C. A1 - Krause, Martin A1 - Algernon, Daniel A1 - Streicher, Doreen A1 - Maierhofer, Christiane A1 - Glaubitt, A. T1 - Quantitativer Verfahrensvergleich KW - ZfPBau KW - Ultraschallecho KW - Radar KW - Impact-Echo KW - Dickenmessung KW - Betondeckung KW - Hüllrohrortung KW - Betonbauteile PY - 2006 SN - 978-3-433-01833-0 SN - 0342-7617 VL - 1 IS - Kap. V / Abschnitt 11 SP - 567 EP - 573 PB - Ernst CY - Berlin AN - OPUS4-14379 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Algernon, Daniel A1 - Wiggenhauser, Herbert A1 - Schubert, F. T1 - A new approach for the investigation of geometry effects in impact-echo measurements - experimental results and numerical simulations N2 - 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. T2 - 9th European Conference on NDT CY - Berlin, Germany DA - 2006-09-25 KW - Impact-Echo KW - Nondestructive Testing KW - Geometry Effects KW - EFIT PY - 2006 UR - http://www.ndt.net/article/ecndt2006/doc/P19.pdf SN - 3-931381-86-2 SP - 1 EP - 10 PB - European Federation for Non-Destructive Testing CY - Berlin AN - OPUS4-14434 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Streicher, Doreen A1 - Algernon, Daniel A1 - Wöstmann, Jens A1 - Behrens, Matthias A1 - Wiggenhauser, Herbert T1 - Automated NDE of post-tensioned concrete bridges using imaging echo methods T2 - 29. Darmstädter Massivbauseminar, "Sicherheitsgewinn durch Monitoring?" CY - Darmstadt, Germany DA - 2006-09-14 KW - Zerstörungsfreie Prüfung im Bauwesen KW - Brückenuntersuchungen PY - 2006 SP - 477 EP - 487 PB - Freunde des Instituts für Massivbau der Technischen Universität Darmstadt CY - Darmstadt AN - OPUS4-14397 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Wiggenhauser, Herbert A1 - Krause, Martin A1 - Maierhofer, Christiane A1 - Algernon, Daniel A1 - Gardei, André A1 - Gräfe, Boris A1 - Kohl, Christoph A1 - Lausch, Regine A1 - Mielentz, Frank A1 - Milmann, Boris A1 - Streicher, Doreen A1 - Zacher, Gerhard T1 - Grundlagen kombinierter zerstörungsfreier Prüfverfahren zur Untersuchung von Betonbauteilen T2 - Forschergruppe 384 Abschlusskolloquium CY - Bergisch Gladbach, Deutschland DA - 2007-05-03 PY - 2007 SP - 23 EP - 44 PB - BAM CY - Berlin AN - OPUS4-14805 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Wiggenhauser, Herbert A1 - Streicher, Doreen A1 - Algernon, Daniel A1 - Wöstmann, Jens A1 - Behrens, Matthias ED - Russel, M. ED - Basheer, P. T1 - Automated application and combination of non-destructive echo methods for the investigation of post-tensioned concrete bridges T2 - Concrete Platform CY - Belfast, Großbritannien, Northern Ireland DA - 2005-04-19 KW - Automated testing KW - Data fusion KW - Impact-echo KW - Post-tensioned concrete bridges KW - Radar KW - Ultrasonic echo PY - 2007 SN - 978-0-85389-913-6 SP - 261 EP - 269 PB - Queen's University of Belfast CY - Belfast AN - OPUS4-14792 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Streicher, Doreen A1 - Algernon, Daniel A1 - Behrens, Matthias A1 - Wöstmann, Jens A1 - Wiggenhauser, Herbert A1 - Petz, J. T1 - Zerstörungsfreie Zustandsuntersuchungen an Spannbetonbrücken unter Verkehr T2 - DGZfP-Fachtagung Bauwerksdiagnose "Praktische Anwendungen Zerstörungsfreier Prüfungen" CY - Berlin, Deutschland DA - 2006-02-22 KW - Automatisierte ZfPBau-Verfahren KW - Radar KW - Ultraschallecho KW - Impact-Echo KW - Spannbetonbrücken PY - 2006 SN - 3-931381-71-4 SP - 237 EP - 244 PB - DGZfP CY - Berlin AN - OPUS4-12159 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Große, C. A1 - Wiggenhauser, Herbert A1 - Algernon, Daniel A1 - Schubert, F. A1 - Beutel, R. T1 - Impact-Echo - Stand der Technik und Anwendungen des Verfahrens T2 - DAfStb-Fachtagung 2005 "Zerstörungsfreie Prüfverfahren und Bauwerksdiagnose im Betonbau" CY - Berlin, Deutschland DA - 2005-03-10 PY - 2005 SP - 1 EP - 8 PB - BAM CY - Berlin AN - OPUS4-7366 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Algernon, Daniel A1 - Wiggenhauser, Herbert ED - Mazal, P. T1 - Identification of short transient signals within impact-echo data using the Hilbert-Huang-Transform T2 - 3rd International Workshop of NDT Experts CY - Prague, Czech Republic DA - 2005-10-10 KW - Hilbert-Huang Transform KW - Time-Frequency Analysis KW - Impact-Echo KW - Concrete Structures PY - 2005 SN - 80-2142996-8 SP - 9 EP - 17 PB - Univ. of Technology CY - Brno AN - OPUS4-11711 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Streicher, Doreen A1 - Algernon, Daniel A1 - Wöstmann, Jens A1 - Behrens, Matthias A1 - Wiggenhauser, Herbert T1 - Automated NDE of post-tensioned concrete bridges using radar, ultrasonic echo and impact-echo T2 - NDE Conference on Civil Engineering CY - St. Louis, Missouri, USA DA - 2006-08-14 KW - Automatisierte ZfPBau-Verfahren KW - Radar KW - Ultraschallecho KW - Impact-Echo KW - Spannbetonbrücken PY - 2006 SN - 1-57117-148-7 SP - 439 EP - 444 PB - ASTM CY - St. Louis AN - OPUS4-13942 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Algernon, Daniel A1 - Wiggenhauser, Herbert T1 - Impact echo data analysis based on Hilbert-Huang transform N2 - 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. KW - Impact echo KW - Hilbert-Huang transformation PY - 2007 DO - https://doi.org/10.3141/2028-16 SN - 0361-1981 VL - 2028 SP - 146 EP - 153 PB - National Research Council CY - Washington, DC AN - OPUS4-20790 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Helmerich, Rosemarie A1 - Niederleithinger, Ernst A1 - Algernon, Daniel A1 - Streicher, Doreen A1 - Wiggenhauser, Herbert T1 - Bridge Inspection and Condition Assessment in Europe N2 - 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. KW - Category IIIC PY - 2008 DO - https://doi.org/10.3141/2044-04 SN - 0361-1981 VL - 2044 SP - 31 EP - 38 PB - National Research Council CY - Washington, DC AN - OPUS4-18037 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Helmerich, Rosemarie A1 - Niederleithinger, Ernst A1 - Algernon, Daniel A1 - Streicher, Doreen A1 - Wiggenhauser, Herbert T1 - Bridge inspection and condition assessment in Europe T2 - TRB 87th annual meeting CY - Washington, D.C., USA DA - 2008-01-13 KW - Construction KW - Environment and Energy PY - 2008 IS - CD-ROM (Paper 08-1450 / Session 568) SP - 1 EP - 13 PB - TRB CY - Washington, DC AN - OPUS4-16651 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -