eprintid: 1523326 rev_number: 26 eprint_status: archive userid: 608 dir: disk0/01/52/33/26 datestamp: 2016-10-30 01:27:49 lastmod: 2021-10-04 00:23:38 status_changed: 2017-04-28 11:37:51 type: proceedings_section metadata_visibility: show creators_name: Yue, Y creators_name: Bai, Y creators_name: Wang, JJ title: Application of Raman spectroscopy for tracing the status of silica fume in cementitious materials ispublished: pub divisions: UCL divisions: B04 divisions: C05 divisions: F44 note: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. abstract: Silica fume (SF) is an important component for manufacturing high performance concrete (HPC), owing to its superb pozzolanic reactivity and physical filling effects. However, application of SF in concrete may cause potential hazards issues. Although using SF in slurry form can somehow reduce the potential biotoxicity, the long-term stability and status of the SF particles within cementitious materials is still uncertain. In the current study, attempts were made to use Raman spectroscopy as an innovative alternative technique for tracing and identifying the status of SF both in its original SF slurry and in a 6-month-old hydrated cement paste. Light-optical microscope was also used to examine the morphology of the SF particles in the aforementioned samples. The results showed that under Raman spectroscopy, the various components of the SF in slurry, such as amorphous silica, silicon crystal, and carbon, were clearly recognised. In addition, the SF agglomerates formed in the slurry were also detected. On the other hand, the chemical composition, status, and morphology of both SF and SF agglomerates in the 6-month-old paste were also identified. The study reported in this paper indicates that Raman spectroscopy could be a potential technique for tracing the status of SF, so that the potential safety hazards of SF can be monitored. date: 2016-06-30 date_type: published publisher: Shenzhen University, Shenzhen, Guangdong Province, official_url: http://doi.org/10.5703/1288284316128 oa_status: green full_text_type: other language: eng primo: open primo_central: open_green verified: verified_manual elements_id: 1188032 doi: 10.5703/1288284316128 lyricists_name: Bai, Yun lyricists_name: Yue, Yanfei lyricists_id: YBAIX06 lyricists_id: YYUEX97 full_text_status: public series: International Conference on the Durability of Concrete Structures volume: 5 place_of_pub: China pagerange: 174-178 event_title: 5th International Conference on the Durability of Concrete Structures event_location: Shenzhen, China event_dates: 30 June 2016 - 01 July 2016 institution: 5th International Conference on the Durability of Concrete Structures book_title: Proceedings of 5th International Conference on the Durability of Concrete Structures - 2016 citation: Yue, Y; Bai, Y; Wang, JJ; (2016) Application of Raman spectroscopy for tracing the status of silica fume in cementitious materials. In: Proceedings of 5th International Conference on the Durability of Concrete Structures - 2016. (pp. pp. 174-178). Shenzhen University, Shenzhen, Guangdong Province,: China. Green open access document_url: https://discovery.ucl.ac.uk/id/eprint/1523326/1/Bai_ICDCS%202016_Yun%20Bai%20UCL_REF.pdf