Investigations on the effect of alkalis on C-S-H growth rates and their impact on early C3S hydration rates

被引：10

作者：

Wagner, D. ^{[1
]}

Bellmann, F. ^{[2
]}

Neubauer, J. ^{[1
]}

机构：

[1] Friedrich Alexander Univ Erlangen Nuernberg FAU, GeoZentrum Nordbayern, Mineral, Schlossgarten 5a, D-91054 Erlangen, Germany

[2] Bauhaus Univ Weimar, Coudraystr 11, D-99423 Weimar, Germany

来源：

CEMENT AND CONCRETE RESEARCH | 2023年 / 173卷

关键词：

Hydration (A); Ca3SiO5 (D); Alkalis (D); Calcium-silicate-hydrate (B); Pore solution (B); CALCIUM SILICATE HYDRATE; ALITE HYDRATION; TRICALCIUM; CEMENT; MODEL; SODIUM; PRECIPITATION; NUCLEATION; SOLUBILITY; HYDROXIDE;

D O I：

10.1016/j.cemconres.2023.107268

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

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.

引用

页数：12

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