Abstract The use of Al-rich supplementary cementitious materials can effectively reduce the expansion of concrete caused by alkali-silica reaction (ASR). However, the role of Al in mitigating the formation and structure of ASR products is only poorly understood, since direct investigation of the reaction in the micro-scale veins of aggregates is difficult. Recent successful synthesis of ASR products provides a unique opportunity to directly assess the role of Al in ASR. In this study, the effect of Al on the formation and structure of ASR products synthesized at 40 and 80 °C is investigated. It is found that the presence of Al in concentration lower than 0.1 mM neither prevents ASR nor alters the structure of the crystalline ASR products formed at 40 °C. However, formation of the crystalline ASR product at 80 °C is lowered at higher Al content due to the formation of a zeolitic precursor.

中文翻译：

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铝对碱硅反应产物形成和结构的影响

摘要 使用富铝辅助胶凝材料可有效降低碱硅反应（ASR）引起的混凝土膨胀。然而，铝在减轻 ASR 产物的形成和结构方面的作用知之甚少，因为很难直接研究聚集体微尺度脉中的反应。最近 ASR 产品的成功合成为直接评估铝在 ASR 中的作用提供了独特的机会。在本研究中，研究了 Al 对在 40 和 80 °C 下合成的 ASR 产物的形成和结构的影响。发现浓度低于 0.1 mM 的 Al 既不会阻止 ASR，也不会改变在 40 °C 下形成的结晶 ASR 产物的结构。然而，