TY - CONF A1 - Wilsch, Gerd A1 - Eichler, T. A1 - Millar, Steven A1 - Gottlieb, Cassian T1 - Quantitative determination of chloride-to-cement content of concrete by laser-induced breakdown spectroscopy (LIBS) T2 - CONCREEP 10 - Mechanics and physics of creep, shrinkage, and durability of concrete and concrete structures (Proceedings) N2 - Laser-induced breakdown spectroscopy (LIBS) is a combination of plasma generation on the sample surface by a high power laser pulse and optical emission spectroscopy (OES). It is a direct measurement method without an extensive sample preparation. Concrete is a multi phase system. With LIBS it is possible to distinguish the different phases and based on that to correlate the chloride content to the cement mass. This is done by scanning the surface with a resolution of up to 0.1 mm. The high measurement frequency of 100 Hz or even higher allows the in-situ visualization of the chloride content over the measured area. With a calibration a quantification of chloride concentration is possible. As an example the LIBS measurement on a 50 mm by 70 mm area with a resolution of 0.5 mm and the visualization of the chloride distribution takes only 10 minutes. Additionally it is possible to evaluate the carbonation depth from the same measurement. Examples of practical application to determine the chloride-to-cement-content on concrete samples are presented. The possibilities and the limitations of LIBS are discussed. T2 - CONCREEP 10 - Mechanics and physics of creep, shrinkage, and durability of concrete and concrete structures CY - Vienna, Austria DA - 21.09.2015 KW - LIBS KW - Chlorides KW - Carbonation KW - Heterogeneity KW - Quantitative concentration KW - 2D-map PY - 2015 SP - 815 EP - 822 AN - OPUS4-34677 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -