应用热力学方法探讨了298K时钾长石、钠长石、霞石在碱性环境下的碱析出能力,并对这些含碱矿物分解析出的碱对碱-硅酸反应(ASR)的影响进行了讨论.结果表明,由于矿物类型不同,碱性环境下的分解难易程度不同,其中霞石较易分解,钠长石次之,钾长石较难分解;随着溶液pH值增大,除霞石分解能力略有降低外,钠长石、钾长石的分解能力均显著提高.此外,通过加速实验方法证实含有霞石、钠长石、钾长石矿物的集料在使用低碱水泥条件下能显著促进ASR膨胀.
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