盐耦合侵蚀下碱矿渣水泥相演变的热力学模拟

盐耦合侵蚀下碱矿渣水泥相演变的热力学模拟

Zuo, Yibing (Huazhong University of Science and Technology)
Liao, Yishun (Wuhan University of Science and Technology)
Ye, G. (TU Delft Materials and Environment)

2023

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.

alkali‑activated slag cement
combined attack
magnesium sulfate
phase evolution
sodium chloride
thermodynamic modelling

http://resolver.tudelft.nl/uuid:a8f72df8-7a49-408b-a097-2e3f6d809c89

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

2023-09-03

1007-9629

Jianzhu Cailiao Xuebao: Journal of Building Materials, 26 (1), 7-13

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

Institutional Repository

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© 2023 Yibing Zuo, Yishun Liao, G. Ye