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Application of Laser Induced Breakdown Spectroscopy (LIBS)

Date:          September 14, 2015
Time:          13:00 – 17:30
Location:
    BAM - Federal Institute for Materials Research and Testing 
                   Unter den Eichen 87 
                   D-12205 Berlin 
                   Building 60 Room 112 
                   How to get there

Presiding: Gerd Wilsch, Steven Millar and Cassian Gottlieb

Laser Induced Breakdown Spectroscopy (LIBS) – Theory and Practice in building materials analysis

LIBS is a combination of plasma generation on the sample surface by a high power laser pulse and optical emission spectroscopy (OES) to analyze elements at the surface of solids. 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 as an example based on that 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. Additional it is possible to evaluate the carbonation depth from the same measurement. 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 workshop introduces LIBS as a method for chemical analysis of building materials. The current state of the art will be shown and measurement procedures will be demonstrated and discussed.

Registration (limit of 25 participants) 

Schedule 

1300 Welcome, Introductions (GW) 
1315 LIBS fundamentals and systems (GW) 
1400 Case Studies - laboratory and mobile applications (SM, GW, CG)  
1600 Laboratory Visit – demonstration of laboratory and mobile systems
1700 Closing Discussion