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Optical Engineering • Open Access

Monitoring the cementitious materials subjected to sulfate attack with optical fiber excitation Raman spectroscopy
Author(s): Yanfei Yue; Yun Bai; P. A. Muhammed Basheer; John J. Boland; Jing Jing Wang

Paper Abstract

Formation of ettringite and gypsum from sulfate attack together with carbonation and chloride ingress have been considered as the most serious deterioration mechanisms of concrete structures. Although electrical resistance sensors and fiber optic chemical sensors could be used to monitor the latter two mechanisms on site, currently there is no system for monitoring the deterioration mechanisms of sulfate attack. In this paper, a preliminary study was carried out to investigate the feasibility of monitoring sulfate attack with optical fiber excitation Raman spectroscopy through characterizing the ettringite and gypsum formed in deteriorated cementitious materials under an optical fiber excitation + objective collection configuration. Bench-mounted Raman spectroscopy analysis was also conducted to validate the spectrum obtained from the fiber-objective configuration. The results showed that the expected Raman bands of ettringite and gypsum in the sulfate-attacked cement paste can be clearly identified by the optical fiber excitation Raman spectrometer and are in good agreement with those identified from bench-mounted Raman spectrometer. Therefore, based on these preliminary results, it is considered that there is a good potential for developing an optical fiber-based Raman system to monitor the deterioration mechanisms of concrete subjected to sulfate attack in the future.

Paper Details

Date Published: 23 October 2013
PDF: 11 pages
Opt. Eng. 52(10) 104107 doi: 10.1117/1.OE.52.10.104107
Published in: Optical Engineering Volume 52, Issue 10
Show Author Affiliations
Yanfei Yue, Univ. College London (United Kingdom)
Yun Bai, Univ. College London (United Kingdom)
P. A. Muhammed Basheer, Queen's Univ. Belfast (United Kingdom)
John J. Boland, Trinity College Dublin (Ireland)
Jing Jing Wang, Trinity College Dublin (Ireland)

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