采用选择性溶解法和非蒸发水量法定量研究了不同龄期、不同掺量水泥-硅灰-粉煤灰三元复合胶凝体系中矿物掺合料的反应进程.用同细度同掺量的惰性石英粉替代粉煤灰以消除粉煤灰的稀释效应和异核成核效应,得到三元复合胶凝体系中硅灰的反应程度;根据三元复合胶凝体系中矿物掺合料的整体反应程度,计算了粉煤灰的反应程度.结果表明,硅灰的火山灰反应在复合胶凝体系水化ld时就已经开始,并呈现早期快而后期慢的特点;而粉煤灰的火山灰效应,在7d以后才开始并加快.在三元复合胶凝体系中,硅灰和粉煤灰的反应程度均随着粉煤灰掺量的提高而降低.
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