Investigations on the effect of alkalis on C-S-H growth rates and their impact on early C3S hydration rates
Wagner D, Bellmann F, Neubauer J (2023)
Publication Type: Journal article, Original article
Publication year: 2023
Journal
Book Volume: 173
Article Number: 107268
DOI: 10.1016/j.cemconres.2023.107268
Abstract
In this work, we investigated the influence of alkalis on C-S-H precipitation and growth rates in solutions supersaturated
with respect to C-S-H. Therefore, we used an experimental setup that leads to C-S-H precipitation
and growth in solutions with a known KOH concentration. The results show that the KOH concentration in
solution generally leads to an increase of the C-S-H growth rates at lower supersaturation levels. Based on these
findings, we calculated theoretical reaction rates of C3S hydration using the precipitation rates of C-S-H. The
comparison between these calculated rates and measured reaction rates from hydration experiments shows good
agreement, allowing us to present a quantitative model for the effect of alkalis in combination with aluminum.
Furthermore, we provide a quantitative analysis of how alkalis and aluminum modify reaction rates during the
acceleration period of C3S hydration, which can be explained by different behaviors in the nucleation and growth
of C-S-H.
Authors with CRIS profile
Involved external institutions
Germany (DE)How to cite
APA:
Wagner, D., Bellmann, F., & Neubauer, J. (2023). Investigations on the effect of alkalis on C-S-H growth rates and their impact on early C3S hydration rates. Cement and Concrete Research, 173. https://doi.org/10.1016/j.cemconres.2023.107268
MLA:
Wagner, Daniel, Frank Bellmann, and Jürgen Neubauer. "Investigations on the effect of alkalis on C-S-H growth rates and their impact on early C3S hydration rates." Cement and Concrete Research 173 (2023).
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