Abstract Afwillite is a crystalline calcium silicate hydrate (3CaO·2SiO2·3H2O) that can be used for the acceleration of tricalcium silicate hydration. Experimental data was recorded in this study to shed further light on the basic mechanisms for this acceleration effect. It is observed that afwillite addition favours growth of the afwillite seeds and hardly any C-S-H is formed. The pore solution chemistry during hydration closely resembles that of unseeded tricalcium silicate indicating that pore solution chemistry is not triggering the accelerating effect of afwillite. Much higher degrees of hydration are observed after the main hydration period in the presence of afwillite seeds. This is explained by the formation of relatively large afwillite crystals in some distance to the surface of tricalcium silicate. This is different to the hydration of tricalcium silicate in the absence of afwillite seeds when C-S-H is precipitated on the surface of the tricalcium silicate particles.

中文翻译：

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硅酸三钙加速水化硅藻土晶种的基本机制

摘要 Afwillite 是一种结晶水化硅酸钙（3CaO·2SiO2·3H2O），可用于促进硅酸三钙的水化。本研究记录了实验数据，以进一步阐明这种加速效应的基本机制。观察到添加粉煤灰有利于粉煤灰种子的生长并且几乎没有形成任何 CSH。水合过程中的孔隙溶液化学与未晶种的硅酸三钙非常相似，这表明孔隙溶液化学不会触发粉煤灰的加速作用。在 afwillite 种子存在的情况下，在主要水化期之后观察到更高程度的水化。这可以通过在离硅酸三钙表面一定距离处形成相对较大的硅镁石晶体来解释。