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Phase diagrams for alkali-activated slag binders
File(s)
OA Location
Author(s)
Myers, Rupert J
Bernal, Susan A
Provis, John L
Type
Journal Article
Abstract
Phase diagrams for alkali-activated slag (AAS) binders are simulated at (metastable) thermodynamic equilibrium, spanning the relevant compositional envelopes for these materials. The phase diagrams are generally consistent with experimental observations in the literature, dominated by calcium (alkali) aluminosilicate hydrate (C-(N-)A-S-H) gels and Mg-Al layered double hydroxides. Relationships between the stabilities of the predicted solid phase assemblages, pore solution compositions, and the bulk chemical composition are identified, yielding an improved understanding of AAS binder chemistry. Strätlingite is predicted at low to intermediate Si concentrations and at high Al content, while zeolites (and thus most likely also disordered alkali-aluminosilicate (hydrate) gels) tend to precipitate at higher concentrations of both Si and Al; katoite and AFm-type phases are stabilised at intermediate levels of CaO + Al2O3 + MgO. The application of these results in designing AAS binders can enable the phase assemblages and chemical properties of these materials to be more precisely controlled.
Date Issued
2017-05
Date Acceptance
2017-02-10
Citation
Cement and Concrete Research, 2017, 95, pp.30-38
URI
URL
DOI
ISSN
0008-8846
Publisher
Elsevier BV
Start Page
30
End Page
38
Journal / Book Title
Cement and Concrete Research
Volume
95
Copyright Statement
© 2017 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
Identifier
https://www.sciencedirect.com/science/article/pii/S0008884616307955?via%3Dihub
Subjects
Science & Technology
Technology
Construction & Building Technology
Materials Science, Multidisciplinary
Materials Science
Alkali activated cement
Granulated blast-furnace slag
Calcium-silicate-hydrate (C-S-H)
Hydration products
Thermodynamic calculations
BLAST-FURNACE SLAG
HYDROTALCITE-LIKE PHASES
HIGH-RESOLUTION NMR
C-S-H
THERMODYNAMIC PROPERTIES
HYDRATION PRODUCTS
EVOLUTION
MODEL
THERMOCHEMISTRY
TEMPERATURE
Building & Construction
0905 Civil Engineering
1202 Building
0904 Chemical Engineering
Publication Status
Published
Date Publish Online
2017-02-28