TY - CONF A1 - Bienert, K. A1 - Schalk, H. A1 - Molkenthin, A. A1 - Wilsch, Gerd A1 - Goldschmidt, Sebastian A1 - Niederleithinger, Ernst T1 - Qualitätskontrolle von Hydrophobierungen mit einem integrierten Markerelement durch die laser-induced breakdown spectroscopy (LIBS) N2 - Stahlbetonbauwerke sind nutzungsbedingt Umwelteinwirkungen ausgesetzt, die zu Schäden an der Konstruktion führen können. Dabei ist in erster Linie die Einwirkung von tausalzhaltigen Wässern im Winter zu nennen, die durch den Beton kapillär und über Diffusionsvorgänge aufgenommen werden. Dies fuhrt durch den Chlorideinfluss langfristig zur Korrosion der Bewehrung. Zudem leidet die Frost-Taubeständigkeit durch das Herabsetzen der Gefrierpunkttemperatur im Porenwasser. Die Folge sind Abwitterungen an der Betonoberfläche. Die meisten zerstörenden Prozesse werden durch einen Feuchtigkeitstransport ausgelöst, der lösliche Substanzen beinhaltet. Hydrophobierungen können zur Vorbeugung von solchen Schäden verwendet werden aber es gibt bisher keine Methoden zur Qualitätssicherung vor-Ort. Eine Möglichkeit der Qualitätssicherung ist, eine markierende Substanz in, die Tiefenhydrophobierung zu integrieren, die durch spektroskopische Methoden detektiert werden kann. Unterschiedliche Arten von Markerelementen wurden hierfür getestet Es konnte gezeigt werden, dass Übergangsmetalle am besten als Marker geeignet sind. Derzeit wird ein mobiles LIBS - System für die Messung der Eindringtiefe und zu hoch aufgelösten Darstellung der Wirkstoffverteilung in der Betonrandzone entwickelt. T2 - 18. Ibausil - Internationale Baustofftagung CY - Weimar, Germany DA - 12.09.2012 KW - Hydrophobierung KW - Markerelement KW - Qualitätskontrolle KW - Eindringtiefe KW - Betonreparatur KW - Lochfraßkorrosion KW - Chloride KW - Frost-Tausalz-Wechsel KW - LIBS PY - 2012 SN - 978-3-00-034075-8 VL - 2 IS - 3.07 SP - 2-0398 EP - 2-0409 AN - OPUS4-27601 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Wilsch, Gerd A1 - Schalk, H. A1 - Bienert, K. A1 - Molkenthin, A. A1 - Goldschmidt, Sebastian A1 - Niederleithinger, Ernst T1 - Quality control of hydrophobic coatings with an integrated marker element by laser-induced breakdown spectroscopy (LIBS) N2 - Reinforced concrete structures are affected by damage, caused e.g., by freeze-thaw effects or corrosion. Most damage processes are triggered by moisture transport including soluble substances. Hydrophobic coatings can be used for prevention of such damage, but quantitative on-site quality assurance methods are so far missing. A way to overcome this problem is to integrate marker substances into the coating, which can be detected by spectroscopic methods. Different types of marker elements have been tested. It can be shown that transition metals are best suited for the task. Currently a LIBS (Laser Induces Breakdown Spectroscopy) system is developed for the measurement of penetration depth and content of the hydrophobic coating via the marker element in the peripheral zone of concrete. T2 - 2nd International conference Micro Durability - Microstructural-related durability of cementitious composites CY - Amsterdam, The Netherlands DA - 11.04.2012 KW - Hydrophobierung KW - Laser Induced Breakdown Spektroskopie (LIBS) KW - Qualitätskontrolle PY - 2012 SN - 978-2-35158-129-2 N1 - Serientitel: RILEM proceedings – Series title: RILEM proceedings VL - PRO83 SP - 1 EP - 10 AN - OPUS4-27534 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Wilsch, Gerd A1 - Goldschmidt, Sebastian A1 - Niederleithinger, Ernst A1 - Bienert, K. A1 - Schalk, H. A1 - Molkenthin, A. ED - Jacobsen, S. ED - Justnes, H. ED - Cepuritis, R. ED - Hornbostel, K. ED - Peng, Y. T1 - Quality control of hydrophobic coatings with an integrated marker element by laser-induced breakdown spectroscopy (LIBS) N2 - Reinforced concrete structures are affected by damage caused e. g. by freeze-thaw effects or corrosion. Most damage processes are triggered by moisture transport including soluble substances. Hydrophobie coatings can be used for prevention of such damage, but quantitative on-site quality assurance methods are so far missing. A way to overcome this problem is to integrate marker substances into the coating, which can be detected by spectroscopic methods. Different types of marker elements have been tested. It can be shown that transition metals are best suited for the task. Currently a LIBS (laser-induced breakdown spectroscopy) System is developed for the measurement of penetration depth and content of the hydrophobic coating via the marker element in the peripheral zone of concrete. T2 - ICDC 2012 - International congress on durability of concrete CY - Trondheim, Norway DA - 18.06.2012 KW - Hydrophobic coating KW - Marker element KW - Quality control KW - Depth of penetration KW - Concrete repair KW - Pitting corrosion KW - Chloride KW - Exposure KW - Freeze-taw cycles KW - Laser-induced breakdown spectroscopy KW - Hydrophobierung KW - Laser Induced Breakdown Spektroskopie KW - Qualitätskontrolle PY - 2012 SN - 978-82-8208-031-6 SP - Session B 1, 1 EP - 14 AN - OPUS4-27527 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Bienert, K. A1 - Schalk, H. A1 - Molkenthin, A. A1 - Wilsch, Gerd A1 - Goldschmidt, Sebastian A1 - Niederleithinger, Ernst ED - Grantham, M. ED - Mechtcherine, V. ED - Schneck, U. T1 - Quality control of hydrophobic coatings with an integrated marker element by laser-induced breakdown spectroscopy (LIBS) N2 - Reinforced concrete structures are affected by damage, caused e.g., by freeze-thaw effects or corrosion. Most damage processes are triggered by moisture transport including soluble substances. Hydrophobic coatings can be used for prevention of such damage, but quantitative on-site quality assurance methods are so far missing. A way to overcome this problem is to integrate marker substances into the coating, which can be detected by spectroscopic methods. Different types of marker elements have been tested. It can be shown that transition metals are best suited for the task. Currently a LIBS (Laser Induces Breakdown Spectroscopy) system is developed for the measurement of penetration depth and content of the hydrophobic coating via the marker element in the peripheral zone of concrete. T2 - Concrete solutions 2011 - 4th International conference on concrete repair CY - Dresden, Germany DA - 26.09.2011 KW - Laser induced breakdown spectroscopy (LIBS) KW - Hydrophobic coating KW - Quality control KW - Depth of penetration KW - Concrete repair KW - Chloride PY - 2012 SN - 978-0-415-61-622-5 SP - 805 EP - 811 PB - Taylor & Francis CY - London AN - OPUS4-25151 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Eichler, Thorsten A1 - Isecke, Bernd A1 - Wilsch, Gerd A1 - Goldschmidt, Sebastian A1 - Bruns, M. T1 - Investigations on the chloride migration in consequence of cathodic polarisation N2 - At the Institute for Building Materials Research (ibac) in Aachen and the Federal Institute for Materials Research and Testing (BAM) in Berlin a joint research project is currently running with the aim to develop a numerical model which describes cathodic protection (CP) of reinforced concrete. Special project focus is the CP of the rear reinforcement layer. The resulting model shall include the impact of chemical alterations at the steel surface and within the adjacent concrete on the polarisation behaviour of reinforcement, which are induced by long-term application of CP. The investigations presented in this paper aim to clarify open aspects on the migration of chloride ions due to small electric fields as applied in CP of steel in reinforced concrete structures. A comparatively new method, laser induced breakdown spectroscopy (LIBS), was applied in order to determine chloride concentration profiles on laboratory specimens as one of several model parameters for a mathematical description of CP of the rear reinforcement of reinforced concrete structures. The paper concerns migration tests using non-saturated specimens under laboratory conditions at constant voltage and the application of the experimental parameters on FEM-calculations. The presented results suggest the conclusion that even comparably small electric fields, as applied in CP of steel in concrete, may lead to significant and sustainable reduction in chloride concentration at the surface of the reinforcement. KW - Steel in concrete KW - Cathodic protection KW - Pitting corrosion KW - Mild steel KW - Electrochemical impedance spectroscopy PY - 2010 DO - https://doi.org/10.1002/maco.200905560 SN - 0947-5117 SN - 1521-4176 VL - 61 IS - 6 SP - 512 EP - 517 PB - Wiley-VCH Verl. CY - Weinheim AN - OPUS4-21511 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CHAP A1 - Eichler, Thorsten A1 - Isecke, Bernd A1 - Wilsch, Gerd A1 - Goldschmidt, Sebastian A1 - Bruns, M. ED - Gieler-Breßmer, Susanne T1 - Untersuchungen zur Chloridmigration beim kathodischen Korrosionsschutz von Stahl in Beton T2 - 7. Symposium Kathodischer Korrosionsschutz von Stahlbetonbauwerken CY - Ostfildern, Deutschland DA - 2009-11-26 KW - Thermal sprayed zinc KW - Cathodic protection KW - Steel in concrete KW - Multi-storey-car-park PY - 2009 SN - 3-924813-79-5 IS - Kap. 13 SP - 23 EP - 30 AN - OPUS4-20917 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Bollmann, K. A1 - Lyhs, P. A1 - Molkenthin, A. A1 - Wilsch, Gerd A1 - Goldschmidt, Sebastian ED - Stark, J. T1 - Untersuchung von Betonflächen mittels Laser Induced Breakdown Spectroscopy (LIBS) zur Klärung möglicher Prüfartefakte bei der Prüfung des Frost-Tausalz-Widerstandes T2 - 17. Ibausil - Internationale Baustofftagung CY - Weimar, Germany DA - 2009-09-23 KW - Beton KW - Dauerhaftigkeit KW - Abwitterung KW - CDF-Test KW - LIBS KW - Alkalien PY - 2009 SN - 978-3-00-027265-3 IS - Paper 2.101 SP - 1 EP - 6 CY - Weimar AN - OPUS4-20649 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Eichler, Thorsten A1 - Isecke, Bernd A1 - Wilsch, Gerd A1 - Goldschmidt, Sebastian A1 - Bruns, M. T1 - Investigations on alterations of electrochemical parameters of steel in chloride containing concrete in consequence of cathodic polarization T2 - EUROCORR 2008 CY - Edinburgh, Scotland, UK DA - 2008-09-07 KW - LIBS KW - Cathodic Protection KW - Steel in concrete KW - Chloride Migration PY - 2008 N1 - Serientitel: EFC-Event – Series title: EFC-Event IS - 299 SP - 1 EP - 15 PB - DECHEMA CY - Frankfurt am Main AN - OPUS4-18370 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -