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).
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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
Type: | Proceedings paper |
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Title: | Development of calcium sulfoaluminate cement composites for nuclear waste encapsulation |
Event: | International Workshop on Innovation in Low-carbon Cement & Concrete Technology |
Location: | London, UK |
Dates: | 21 September 2016 - 24 September 2016 |
Open access status: | An open access version is available from UCL Discovery |
Language: | English |
Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
UCL classification: | UCL UCL > Provost and Vice Provost Offices UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng |
URI: | https://discovery.ucl.ac.uk/id/eprint/1523319 |




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