A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Quantitative determination of chlorine and sulphur content in building materials by laser-induced breakdown spectroscopy
Concrete structures are endangered by chloride ingress, leading to corrosion of reinforcement and by sulphates leading to deterioration of concrete. The performance of the Laser-Induced Breakdown Spectroscopy (LIBS) for the quantitative determination of chlorine and sulphur content in building materials is demonstrated. The chloride and sulphate content can be calculated by stoichiometric methods. To take the heterogeneity of the concrete into account measurements are performed in a statistical way. The ratio of the calcium to the oxygen spectral line is used for the differentiation between cement and aggregates. LIBS proofed the potential to overcome the problem of sampling and to refer the results directly on the cement content of the sample. LIBS can image the spatial distribution of chlorine and sulphur content in the sample under investigation with a spatial resolution of 1 mm. Depth profile of chlorine ingress in concrete measured on a core taken from a building located in a marine environment and depth profile of sulphur ingress measured on a core from a sewage plant with a resolution of 2 mm are shown. They are in good correlation with results of standard chemical investigations. The limit of detection for chlorine is 0,15 M% and for sulphur it is 0.2 M% related to concrete. Measurements are performed directly at the sample surface and the results are available on-line. The aim of the development at BAM is a portable LIBS device for use on-site.
Quantitative determination of chlorine and sulphur content in building materials by laser-induced breakdown spectroscopy
Concrete structures are endangered by chloride ingress, leading to corrosion of reinforcement and by sulphates leading to deterioration of concrete. The performance of the Laser-Induced Breakdown Spectroscopy (LIBS) for the quantitative determination of chlorine and sulphur content in building materials is demonstrated. The chloride and sulphate content can be calculated by stoichiometric methods. To take the heterogeneity of the concrete into account measurements are performed in a statistical way. The ratio of the calcium to the oxygen spectral line is used for the differentiation between cement and aggregates. LIBS proofed the potential to overcome the problem of sampling and to refer the results directly on the cement content of the sample. LIBS can image the spatial distribution of chlorine and sulphur content in the sample under investigation with a spatial resolution of 1 mm. Depth profile of chlorine ingress in concrete measured on a core taken from a building located in a marine environment and depth profile of sulphur ingress measured on a core from a sewage plant with a resolution of 2 mm are shown. They are in good correlation with results of standard chemical investigations. The limit of detection for chlorine is 0,15 M% and for sulphur it is 0.2 M% related to concrete. Measurements are performed directly at the sample surface and the results are available on-line. The aim of the development at BAM is a portable LIBS device for use on-site.
Quantitative determination of chlorine and sulphur content in building materials by laser-induced breakdown spectroscopy
Quantitative Analyse von Chlor- und Schwefelgehalten in Baustoffen durch Laser induzierte Breakdown-Spektroskopie
Schaurich, D. (author) / Taffe, A. (author) / Weritz, F. (author) / Wilsch, G. (author)
2006
8 Seiten, 7 Bilder, 15 Quellen
Conference paper
Storage medium
English
Laser-induced Breakdown Spectroscopy for On-site Determination of Chloride and Sulphur Content
| British Library Conference Proceedings | 2004
Determination of chloride content in concrete structures with laser-induced breakdown spectroscopy
| British Library Conference Proceedings | 2005
Determination of chloride content in concrete structures with laser-induced breakdown spectroscopy
| Online Contents | 2005
Determination of chloride content in concrete structures with laser-induced breakdown spectroscopy
| British Library Online Contents | 2005