Zhu, X, Zhang, M, Yang, Y et al. (6 more authors) (2021) Understanding the aqueous phase of alkali-activated slag paste under bath-curing. Advances in Cement Research, 33 (2). pp. 59-73. ISSN 0951-7197
Abstract
The chemical compositions of aqueous phases in alkali-activated slag paste and Portland cement paste were determined up to 28 days with an aim at obtaining a better understanding of stability of hydration products in the two binder systems. The saturation levels with respect to hydration products of PC and AAS are approached through thermodynamic modeling. The main findings include: (1) the effective saturation indices for portlandite in AAS system is always below 0 and sulfate-bearing phases are not stable in AAS compared to those in PC; (2) the strätlingite and hydrotalcite phases should be stable in AAS due to the high [Mg] and [Si] concentrations in the pore solution; (3) both ionic strength and alkalinity of AAS pore solution are higher than those of PC, which are responsible for severer efflorescence in AAS paste and higher conductivity of AAS pore solution. According to thermodynamic estimation, T-based C–S–H is dominant in the AAS system after 7 days, while J- and T-based C–S–H gel were presented in PC system up to 28 days. It suggests that in PC and AAS, different solid phases are formed during the hydration, which change with time, and reactions and equilibria in both binders are completely different.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © ICE Publishing, all rights reserved. This is an author produced version of a paper published in Advances in Cement Research. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | alkali-activated cements; chemical properties; Portlandite; Solution chemistry |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Civil Engineering (Leeds) > Institute for Resilient Infrastructure (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 30 Sep 2019 11:04 |
Last Modified: | 16 Dec 2021 12:37 |
Status: | Published |
Publisher: | ICE Publishing |
Identification Number: | 10.1680/jadcr.18.00202 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:151466 |