Influence of w/s ratio on alite dissolution and C-S-H precipitation rates during hydration
Naber C, Bellmann F, Neubauer J (2020)
Publication Type: Journal article
Publication year: 2020
Journal
Book Volume: 134
Article Number: 106087
DOI: 10.1016/j.cemconres.2020.106087
Abstract
The first 24 h of hydration of tricalcium silicate (C3S) have been studied at varying water/solid (w/s) mass ratios ranging from 0.5 to 10. Gathered data comprise the reaction degree, pore solution concentrations and specific surface area evolution. Combined with interfacial C3S dissolution rates and C-S-H precipitation rates found in the literature, these data are used to calculate theoretical reaction rates from C-S-H precipitation and C3S dissolution. Compared with the measured reaction rates, theoretical rates calculated from C-S-H precipitation show a good match, indicating a correct kinetic description of C-S-H precipitation. Theoretical rates calculated from C3S dissolution are higher than expected during the first hours of hydration which could be explained by the buildup of a metastable hydrate phase barrier. Furthermore, a comparison of the reaction rates shows no effect of the w/s ratio. The Ca concentration evolution indicates a delay of the first portlandite precipitation with increasing w/s ratio.
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Germany (DE)How to cite
APA:
Naber, C., Bellmann, F., & Neubauer, J. (2020). Influence of w/s ratio on alite dissolution and C-S-H precipitation rates during hydration. Cement and Concrete Research, 134. https://doi.org/10.1016/j.cemconres.2020.106087
MLA:
Naber, Christoph, F. Bellmann, and Jürgen Neubauer. "Influence of w/s ratio on alite dissolution and C-S-H precipitation rates during hydration." Cement and Concrete Research 134 (2020).
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