期刊
CEMENT AND CONCRETE RESEARCH
卷 95, 期 -, 页码 30-38出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2017.02.006
关键词
Alkali activated cement; Granulated blast-furnace slag; Calcium-silicate-hydrate (C-S-H); Hydration products; Thermodynamic calculations
资金
- The University of Sheffield, Siam Cement Public Company (SCG) Ltd. at the University of California, Berkeley
- National Science Foundation at Yale University [1636509]
- European Research Council [335928 (GeopolyConc)]
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1636509] Funding Source: National Science Foundation
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. Stratlingite 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. (C) 2017 The Authors. Published by Elsevier Ltd.
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