eprintid: 1410474 rev_number: 32 eprint_status: archive userid: 608 dir: disk0/01/41/04/74 datestamp: 2013-10-20 18:49:19 lastmod: 2021-10-04 00:23:27 status_changed: 2013-10-20 18:49:19 type: article metadata_visibility: show item_issues_count: 0 creators_name: Yue, Y creators_name: Bai, Y creators_name: Muhammed Basheer, PA creators_name: Boland, JJ creators_name: Wang, JJ title: Monitoring the cementitious materials subjected to sulfate attack with optical fiber excitation Raman spectroscopy ispublished: pub divisions: UCL divisions: B04 divisions: C05 divisions: F44 note: © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI. 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. © The Authors. date: 2013-10-23 official_url: http://dx.doi.org/10.1117/1.OE.52.10.104107 vfaculties: VENG oa_status: green full_text_type: pub primo: open primo_central: open_green verified: verified_manual elements_source: Scopus elements_id: 910698 doi: 10.1117/1.OE.52.10.104107 lyricists_name: Bai, Yun lyricists_name: Yue, Yanfei lyricists_id: YBAIX06 lyricists_id: YYUEX97 full_text_status: public publication: Optical Engineering volume: 52 number: 10 article_number: 104107 issn: 0091-3286 citation: Yue, Y; Bai, Y; Muhammed Basheer, PA; Boland, JJ; Wang, JJ; (2013) Monitoring the cementitious materials subjected to sulfate attack with optical fiber excitation Raman spectroscopy. Optical Engineering , 52 (10) , Article 104107. 10.1117/1.OE.52.10.104107 <https://doi.org/10.1117/1.OE.52.10.104107>. Green open access document_url: https://discovery.ucl.ac.uk/id/eprint/1410474/1/OE_52_10_104107.pdf