eprintid: 1523319 rev_number: 24 eprint_status: archive userid: 608 dir: disk0/01/52/33/19 datestamp: 2016-10-30 01:26:24 lastmod: 2020-02-12 16:23:30 status_changed: 2017-07-03 11:57:12 type: proceedings_section metadata_visibility: show creators_name: McCague, C creators_name: Zhou, Q creators_name: Basheer, PAM creators_name: Bai, Y title: Development of calcium sulfoaluminate cement composites for nuclear waste encapsulation ispublished: pub divisions: UCL divisions: A01 divisions: B04 divisions: C05 divisions: F44 note: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. abstract: In the UK, nuclear wastes are usually ‘cemented’ before disposal so that harmful radionuclides can be physically and chemically contained. In this process, conventional Portland cement is blended with high levels of relatively inert mineral additions, mostly to reduce the high heat evolution in large pours. Calcium sulfoaluminate cement (CSAC) has recently attracted interest in various applications due to its lower pH and ability to bind significant quantities of water compared with conventional Portland cement. Such qualities are particularly suited to the encapsulation of legacy wastes such as aluminium and uranium, which would otherwise corrode if embedded within a Portland cement environment. While some early trials have demonstrated 111 good potential of CSAC, the rapid reaction rate (and associated heat generation) is still restricting its use. In this paper, common mineral additions such as ground granulated blastfurnace slag (GGBS), pulverised fuel ash (PFA) and limestone powder (LSP) were incorporated at very high replacement levels (up to 75%) in an attempt to dilute the cement matrix and hence reduce the heat of hydration. Studies of compressive strength, heat of hydration and aluminium corrosion revealed that these CSAC composites demonstrate excellent potential for aluminium waste encapsulation. Keywords: Calcium sulfoaluminate cement, composites, nuclear waste encapsulation, corrosion, aluminium date: 2016-09-21 date_type: published oa_status: green full_text_type: pub language: eng primo: open primo_central: open_green verified: verified_manual elements_id: 1187991 lyricists_name: Bai, Yun lyricists_name: Zhou, Qizhi lyricists_id: YBAIX06 lyricists_id: QZHOU43 actors_name: Waragoda Vitharana, Nimal actors_id: NWARR44 actors_role: owner full_text_status: public series: International Workshop on Innovation in Low-carbon Cement & Concrete Technology volume: 2016 pagerange: 110-114 event_title: International Workshop on Innovation in Low-carbon Cement & Concrete Technology event_location: London, UK event_dates: 21 September 2016 - 24 September 2016 institution: International Workshop on Innovation in Low-carbon Cement & Concrete Technology book_title: International Workshop on Innovation in Low-carbon Cement & Concrete Technology - 2016 citation: McCague, C; Zhou, Q; Basheer, PAM; Bai, Y; (2016) Development of calcium sulfoaluminate cement composites for nuclear waste encapsulation. In: International Workshop on Innovation in Low-carbon Cement & Concrete Technology - 2016. (pp. pp. 110-114). Green open access document_url: https://discovery.ucl.ac.uk/id/eprint/1523319/1/Bai_Colum%20McCague.pdf