Influence of gypsum and KOH on the hydration of pure triclinic C3S

Becker F, Wagner D, Bellmann F, Neubauer J (2025)


Publication Language: English

Publication Type: Journal article

Publication year: 2025

Journal

Book Volume: 491

Article Number: 142679

DOI: 10.1016/j.conbuildmat.2025.142679

Abstract

This work focuses on the isolated and combined influence of gypsum and KOH on the hydration of pure triclinic C3S. The addition of gypsum shows a prolonged induction period and increased maximum reaction rates during C3S hydration. These effects are further enhanced when KOH is added. Pore solution composition from ICP-OES measurements of suspension experiments show pore solutions dominated by an equilibrium with gypsum. Resulting changes in C-S-H interfacial precipitation rates are qualitatively correlated with either a prolonged or shortened induction period. A comparison of C3S reaction rates calculated based on C-S-H interfacial precipitation rate model and C3S reaction rates observed by XRD and TGA show an accurate quantitative description of the C3S hydration in the presence of gypsum and KOH. In the combined presence of KOH and gypsum, higher C-S-H surface areas quantitatively explain the increase in C3S reaction rates regarding the decreased interfacial precipitation rates.

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APA:

Becker, F., Wagner, D., Bellmann, F., & Neubauer, J. (2025). Influence of gypsum and KOH on the hydration of pure triclinic C3S. Construction and Building Materials, 491. https://doi.org/10.1016/j.conbuildmat.2025.142679

MLA:

Becker, Franz, et al. "Influence of gypsum and KOH on the hydration of pure triclinic C3S." Construction and Building Materials 491 (2025).

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