盐耦合侵蚀下碱矿渣水泥相演变的热力学模拟

Journal article (2023)

Authors

Yibing Zuo Huazhong University of Science and Technology

Yishun Liao Wuhan University of Science and Technology

G. Ye Materials and Environment -

Research Group

Materials and Environment () (TU Delft)

DOI: https://doi.org/10.3969/j.issn.1007-9629.2023.01.002

Magnesium sulfate Thermodynamic modelling Sodium chloride Alkali‑activated slag cement Combined attack Phase evolution

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Published Date

2023

Language

Chinese

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Faculty

Civil Engineering & Geosciences

Department

Materials- Mechanics- Management & Design

Research Group

Materials and Environment

Abstract

Thermodynamic parameters of chloride and sulfate intercalated hydrotalcites were deduced. The phase evolutions in alkali‑activated slag cement upon only sodium chloride or only magnesium sulfate attack and combined attack of those two salts were investigated via thermodynamic modelling. Friedel's salt was predicted to form under sodium chloride attack， while monosulfate， ettringite， gypsum， magnesium silicate hydrate and sulfate intercalated hydrotalcite were predicted to form upon magnesium sulfate attack. The combined attack of sodium chloride and magnesium sulfate exhibited not only characteristics by single attack of those two salts but also coupling effects which promoted the formation of chloride intercalated hydrotalcite and inhibited the formation of Friedel's salt and magnesium silicate hydrate. An increase of the magnesium sulfate proportion led to lower capacity of chemically binding chloride.

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