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A platform for research: civil engineering, architecture and urbanism
Laser-induced breakdown spectroscopy for on-site determination of chloride in concrete
The Chloride content is an important factor which influences the durability of concrete structures. The standard methods are mostly intricate, time consuming and require a chemical laboratory. This article describes the application of a spectroscopic method, the laser-induced breakdown spectroscopy (LIBS). The set-up and the experimental conditions for Chloride detection in building materials are presented. A calibration curve from LIBS-measurements on cement mortar samples is obtained. A Chloride content in concrete cores can be measured with a detection limit of at least 0.2 wt %. Depth profiles with a resolution of 2 mm, a resolution which is not available by standard methods, are presented. A comparison of LIBS measurements and standard chemical analysis shows good agreement. Additionally a criterion to measure the percentage of cement was defined. This was used to create spatial resolved pictures of the cement and aggregate distribution, which agree well with reality. In the same way the traceability of Chloride was visualized. In principle it is possible to visualize the colour coded Chloride content in the same manner. It was shown, that the LIBS measurements are a suitable tool for the determination of Chloride contents in concrete. Compared with standard chemical methods LIBS can provide more information - a better depth and spatial resolution - and can be used on site. For future work it is necessary to adapt and optimise the method for on site use and to generate a calibration database to account for the variability of building materials. For an improved calibration it is necessary to produce reference samples and to collect more data. An improvement of the LOD can be reached by optimisation of the experimental set- up, e.g. with a dual pulse plasma generation, application of laser induced fluorescence or use of gateable detectors.
Laser-induced breakdown spectroscopy for on-site determination of chloride in concrete
The Chloride content is an important factor which influences the durability of concrete structures. The standard methods are mostly intricate, time consuming and require a chemical laboratory. This article describes the application of a spectroscopic method, the laser-induced breakdown spectroscopy (LIBS). The set-up and the experimental conditions for Chloride detection in building materials are presented. A calibration curve from LIBS-measurements on cement mortar samples is obtained. A Chloride content in concrete cores can be measured with a detection limit of at least 0.2 wt %. Depth profiles with a resolution of 2 mm, a resolution which is not available by standard methods, are presented. A comparison of LIBS measurements and standard chemical analysis shows good agreement. Additionally a criterion to measure the percentage of cement was defined. This was used to create spatial resolved pictures of the cement and aggregate distribution, which agree well with reality. In the same way the traceability of Chloride was visualized. In principle it is possible to visualize the colour coded Chloride content in the same manner. It was shown, that the LIBS measurements are a suitable tool for the determination of Chloride contents in concrete. Compared with standard chemical methods LIBS can provide more information - a better depth and spatial resolution - and can be used on site. For future work it is necessary to adapt and optimise the method for on site use and to generate a calibration database to account for the variability of building materials. For an improved calibration it is necessary to produce reference samples and to collect more data. An improvement of the LOD can be reached by optimisation of the experimental set- up, e.g. with a dual pulse plasma generation, application of laser induced fluorescence or use of gateable detectors.
Laser-induced breakdown spectroscopy for on-site determination of chloride in concrete
Laserinduzierte Breakdown-Spektroskopie zur Vor-Ort-Bestimmung von Chloriden in Beton
Wilsch, G. (author) / Schaurich, D. (author) / Weritz, F. (author) / Wiggenhauser, H. (author)
2003
10 Seiten, 10 Bilder, 2 Tabellen, 13 Quellen
(Nicht paginiert)
Conference paper
Storage medium
English
Determination of chloride content in concrete structures with laser-induced breakdown spectroscopy
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