Spatially resolved determination of chloride content on rough surfaces using LIBS
- The durability and the lifetime of reinforced concrete structures can be drastically reduced by the influence of damage processes. One of the most common causes is chloride-induced corrosion, which is triggered by increased chloride content near the reinforcement. In a study, the chloride content should be determined directly at corrosion areas. The LIBS system used consists of a micro-chip laser (3 mJ, 100 Hz, 1.5ins) and two compact spectrometers covering the wavelength range of 177-355 nm (UV) and 750-940 nm (NIR). The analysis of the chloride content was carried out via the atomic chlorine spectral line 837.59 nm, using helium for signal amplification. Calibrations were carried out for quantitative chlorine measurements with 15 reference samples in the working range of 0.05 to 6.00 wt% chlorine. The calibration of the LIBS system was done according to DIN 32 645 and was tested for linearity. The determination of the quantitative chlorine contents was carried out on samples whichThe durability and the lifetime of reinforced concrete structures can be drastically reduced by the influence of damage processes. One of the most common causes is chloride-induced corrosion, which is triggered by increased chloride content near the reinforcement. In a study, the chloride content should be determined directly at corrosion areas. The LIBS system used consists of a micro-chip laser (3 mJ, 100 Hz, 1.5ins) and two compact spectrometers covering the wavelength range of 177-355 nm (UV) and 750-940 nm (NIR). The analysis of the chloride content was carried out via the atomic chlorine spectral line 837.59 nm, using helium for signal amplification. Calibrations were carried out for quantitative chlorine measurements with 15 reference samples in the working range of 0.05 to 6.00 wt% chlorine. The calibration of the LIBS system was done according to DIN 32 645 and was tested for linearity. The determination of the quantitative chlorine contents was carried out on samples which were broken and thus have a high surface roughness. This requires real time correction of the focus point to compensate for the roughness of the samples. The poster shows spatially resolved element distributions and determined quantitative chloride concentrations near the corrosion Areas.…
Autor*innen: | Tobias Günther |
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Koautor*innen: | Tobias Völker, Steven Millar, Gerd Wilsch |
Dokumenttyp: | Posterpräsentation |
Veröffentlichungsform: | Präsentation |
Sprache: | Englisch |
Jahr der Erstveröffentlichung: | 2018 |
Organisationseinheit der BAM: | 8 Zerstörungsfreie Prüfung |
8 Zerstörungsfreie Prüfung / 8.2 Zerstörungsfreie Prüfmethoden für das Bauwesen | |
DDC-Klassifikation: | Naturwissenschaften und Mathematik / Chemie / Analytische Chemie |
Freie Schlagwörter: | Chloride; LIBS; Rough surface |
Themenfelder/Aktivitätsfelder der BAM: | Chemie und Prozesstechnik |
Veranstaltung: | Xth international conference on Laser-Induced Breakdown Spectroscopy |
Veranstaltungsort: | Atlanta, GA, USA |
Beginndatum der Veranstaltung: | 21.10.2018 |
Enddatum der Veranstaltung: | 26.10.2018 |
Verfügbarkeit des Dokuments: | Datei im Netzwerk der BAM verfügbar ("Closed Access") |
Datum der Freischaltung: | 03.12.2018 |
Referierte Publikation: | Nein |