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|NDT.net Issue - 2015-11 - Articles ||NDT.net Issue: 2015-11|
Publication: International Symposium Non-Destructive Testing in Civil Engineering (NDTCE 2015), 15-17 Sep 2015, Berlin, Germany (NDTCE 2015)
Laser Induced Breakdown Spectroscopy (LIBS) – Alternative to Wet Chemistry and Micro-XRFGerd Wilsch14, Thorsten Eichler3, Steven Millar4, Cassian Gottlieb4
BAM Federal Institute for Materials Research and Testing1329, Berlin, Germany
Abstract: The laser induced breakdown spectroscopy (LIBS) gives an alternative to the standard techniques for the direct investigation of a building material. It utilize a high energy pulsed laser beam for ablation and vaporization of a small amount of material, a plasma is formed and the plasma radiation is investigated using optical emission spectroscopy. Due to the principal all elements are detectable during one measurement. In combination with a translation stage or scanner system the heterogeneity of concrete is considered in the results. Thus an element concentration may be correlated to the cement content. After calibration with a set of reference samples quantitative results are obtained. The system is automated and allows rapid measurements and minimizes the possibility of errors. At BAM a laboratory LIBS system has been successful applied for the investigation of transport processes of different ions in building materials. The spatial resolution of the measurement may rich 100 µm and the frequency of the measurements is 100 Hz. The concentration of chlorine, sulfur, carbon, sodium, potassium, lithium and hydrogen where quantitatively determined. A mobile system for on-site analysis on bridges or parking decks is available. It is a tool for the estimation of the condition of concrete structures and for quality assurance during concrete repair work on-site. In these work an overview of the possibilities of LIBS for automated investigation of building materials are ...
Keywords: Carbonation (5), Heterogeneity (2), Corrosion (150), ASR (3), LIBS (3), elemental analysis, chlorides (3), sulfates, alkalis (2),