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.

Authors with CRIS profile

Involved external institutions

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://dx.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).

BibTeX: Download