Mobasher, N., Bernal, S.A. and Provis, J.L. (2016) Structural evolution of an alkali sulfate activated slag cement. Journal of Nuclear Materials, 468. 97 - 104. ISSN 0022-3115
Abstract
In this study, the effect of sodium sulfate content and curing duration (from fresh paste up to 18 months) on the binder structure of sodium sulfate activated slag cements was evaluated. Isothermal calorimetry results showed an induction period spanning the first three days after mixing, followed by an acceleration-deceleration peak corresponding to the formation of bulk reaction products. Ettringite, a calcium aluminium silicate hydrate (C-A-S-H) phase, and a hydrotalcite-like Mg-Al layered double hydroxide have been identified as the main reaction products, independent of the Na2SO4 dose. No changes in the phase assemblage were detected in the samples with curing from 1 month up to 18 months, indicating a stable binder structure. The most significant changes upon curing at advanced ages observed were growth of the AFt phase and an increase in silicate chain length in the C-A-S-H, resulting in higher strength.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2015 Elsevier B.V. This is an author produced version of a paper subsequently published in Journal of Nuclear Materials. Uploaded in accordance with the publisher's self-archiving policy. Article available under the terms of the CC-BY-NC-ND licence (https://creativecommons.org/licenses/by-nc-nd/4.0/) |
Keywords: | Alkali-activated slag; Sodium sulfate; Microstructure; X-ray diffraction; Nuclear magnetic resonance spectroscopy |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Materials Science and Engineering (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 08 Jan 2016 11:45 |
Last Modified: | 17 Nov 2017 01:38 |
Published Version: | http://dx.doi.org/10.1016/j.jnucmat.2015.11.016 |
Status: | Published |
Publisher: | Elsevier |
Refereed: | Yes |
Identification Number: | 10.1016/j.jnucmat.2015.11.016 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:93401 |