Myers, R.J., Bernal, S.A. and Provis, J.L. orcid.org/0000-0003-3372-8922 (2014) A thermodynamic model for C-(N-)A-S-H gel: CNASH_ss. Derivation and validation. Cement and Concrete Research, 66. pp. 27-47. ISSN 0008-8846
Abstract
The main reaction product in Ca-rich alkali-activated cements and hybrid Portland cement (PC)-based materials is a calcium (alkali) aluminosilicate hydrate (C-(N-)A-S-H) gel. Thermodynamic models without explicit definitions of structurally-incorporated Al species have been used in numerous past studies to describe this gel, but offer limited ability to simulate the chemistry of blended PC materials and alkali-activated cements. Here, a thermodynamic model for C-(N-)A-S-H gel is derived and parameterised to describe solubility data for the CaO–(Na2O,Al2O3)–SiO2–H2O systems and alkali-activated slag (AAS) cements, and chemical composition data for C-A-S-H gels. Simulated C-(N-)A-S-H gel densities and molar volumes are consistent with the corresponding values reported for AAS cements, meaning that the model can be used to describe chemical shrinkage in these materials. Therefore, this model can provide insight into the chemistry of AAS cements at advanced ages, which is important for understanding the long-term durability of these materials.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2014 Elseveir. This is an author produced version of a paper subsequently published in Cement and Concrete Research. 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: | Calcium-silicate-hydrate (C-S-H); Thermodynamic calculations; Alkali-activated cement; Blended cement; Modelling |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Civil and Structural Engineering (Sheffield) The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Materials Science and Engineering (Sheffield) |
Funding Information: | Funder Grant number EUROPEAN RESEARCH COUNCIL GeopolyConc - 335928 |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 07 Apr 2016 13:47 |
Last Modified: | 10 Jun 2016 12:32 |
Published Version: | https://dx.doi.org/10.1016/j.cemconres.2014.07.005 |
Status: | Published |
Publisher: | Elsevier |
Refereed: | Yes |
Identification Number: | 10.1016/j.cemconres.2014.07.005 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:97067 |
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Filename: Thermodynamic model paper CCR WRRO.pdf
Licence: CC-BY-NC-ND 4.0