Abstract Predicting the conditions for alkali-silica reaction (ASR) had been difficult for several decades due to the lack of in-depth knowledge of the ASR products. In this study, thermodynamic data for the synthesized ASR products (i.e., K-shlykovite, Na-shlykovite and ASR-P1) at 80 °C are determined. The effect of the initial Ca/Si ratio, from 0 to 0.5, on the formation of ASR products at 80 °C is investigated for the samples prepared with an initially fixed K/Si or Na/Si ratio of 0.5. The results show that the amount of ASR products formed first increases and then decreases with increasing the initial Ca/Si ratio. The reduced amount of ASR products at higher Ca/Si ratio is accompanied by formation of C-S-H, suggesting that a conversion of ASR products to C-S-H can occur at high Ca/Si ratio. The solid phases and aqueous chemistry predicted by thermodynamic modelling agrees very well with the experimental results.

中文翻译：

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钙对碱硅反应产物形成的作用

摘要 由于缺乏对 ASR 产品的深入了解，预测碱硅反应 (ASR) 的条件几十年来一直很困难。在本研究中，确定了合成 ASR 产品（即 K-shlykovite、Na-shlykovite 和 ASR-P1）在 80 °C 下的热力学数据。针对初始固定的 K/Si 或 Na/Si 比率为 0.5 制备的样品，研究了初始 Ca/Si 比率（从 0 到 0.5）对 80°C 下 ASR 产物形成的影响。结果表明，随着初始 Ca/Si 比的增加，形成的 ASR 产物的数量先增加后减少。在较高的 Ca/Si 比率下 ASR 产物的量减少伴随着 CSH 的形成，这表明 ASR 产物可以在高 Ca/Si 比率下转化为 CSH。