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.

中文翻译：

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w/s比对水化过程中阿利特溶解和CSH沉淀速率的影响

摘要 已经研究了硅酸三钙 (C3S) 水合的前 24 小时，水/固 (w/s) 质量比范围为 0.5 至 10。收集的数据包括反应程度、孔溶液浓度和比表面积演变。结合文献中发现的界面 C3S 溶解速率和 CSH 沉淀速率，这些数据用于计算 CSH 沉淀和 C3S 溶解的理论反应速率。与实测反应速率相比，由 CSH 沉淀计算的理论速率显示出良好的匹配，表明 CSH 沉淀的动力学描述是正确的。由 C3S 溶解计算的理论速率在水合的最初几个小时内高于预期，这可以通过亚稳态水合物相屏障的建立来解释。此外，反应速率的比较显示 w/s 比率没有影响。Ca 浓度演变表明随着 w/s 比的增加，第一次硅酸盐沉淀的延迟。