Vinnakota, S, Richardson, IG, Brydson, RM orcid.org/0000-0003-2003-7612 et al. (2 more authors)
(2017)
Understanding the Long-Term Evolution of C-A-S-H Phases Present in Cement Backfills.
In:
Proceedings of the 37th Cement and Concrete Science Conference.
37th Cement and Concrete Science Conference, 11-12 Sep 2017, London, UK.
University College London
, pp. 55-58.
Abstract
Samples of aged Nirex Reference Vault Backfill (NRVB) were investigated to study the nature and effects of leaching and hydrothermal treatment on C-A-S-H phases. NRVB is a potential backfill material in the UK, that is composed of CEM I, limestone, hydrated lime and water with w/s ratio of 0.61. The C-A-S-H present in NRVB aged for between 1 and 16 years had high Ca/Si ratio and fine-fibrillar morphology in the outer product region. Leaching resulted in: removal of portlandite and monocarboaluminate; reduced Ca/Si ratio of the C-A-S-H together with a change from fibrillar to foil-like morphology and lengthening of the aluminosilicate chains; followed by destruction of some of the C-A-S-H with the formation of a low-Ca aluminosilicate gel. C-A-S-H(I) was formed upon hydrothermal treatment of a leached sample.
Metadata
Item Type: | Proceedings Paper |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | This is an author produced version of a paper from the Proceedings of the 37th Cement and Concrete Science Conference. |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemical & Process Engineering (Leeds) The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Civil Engineering (Leeds) |
Funding Information: | Funder Grant number Nuclear Decommissioning Authority 202387-AA-0002 |
Depositing User: | Symplectic Publications |
Date Deposited: | 06 Nov 2017 15:35 |
Last Modified: | 13 Dec 2017 13:57 |
Status: | Published |
Publisher: | University College London |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:123489 |