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.
Translated title of the contribution | Thermodynamic Modelling of Phase Evolution in Alkali‑Activated Slag Cement upon Combined Attack of Salts |
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Original language | Chinese |
Pages (from-to) | 7-13 |
Number of pages | 7 |
Journal | Jianzhu Cailiao Xuebao/Journal of Building Materials |
Volume | 26 |
Issue number | 1 |
DOIs | |
Publication status | Published - 2023 |
Bibliographical note
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-careOtherwise 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.
Keywords
- alkali‑activated slag cement
- combined attack
- magnesium sulfate
- phase evolution
- sodium chloride
- thermodynamic modelling