摘   要：在70℃条件下硅灰、矿渣和粉煤灰对碱-硅反应膨胀规律研究的基础上，进一步分析研究了混合材对碱-硅反应膨胀作用的机理。结果表明，混合材对碱-硅反应的作用主要是化学作用和表面物理化学作用。在适当的条件下，化学作用可以使碱-硅反应得到有效抑制，而表面物理化学作用只能使碱-硅反应得到延缓。混合材的化学作用和表面物理化学作用与体系中的Ca(OH)₂含量有着密切的关系，在有大量Ca(OH)₂存在的条件下，混合材不能有效地抑制碱-硅反应膨胀。只有当Ca(OH)₂含量低到一定程度时，混合材才有可能抑制碱-硅反应膨胀。

Abstract: Based on study of the influence of silica fume, slag and fly ash on alkali-silica reaction under the condition of 70℃, the mechanism of the effect of mineral admixtures on alkali-silica reaction is studied further. The results show that the effects of mineral admixtures on alkali-silica reaction are mainly in chemistry effect and surface physichemistry effect. Under the suitable condition, the chemistry effect may make alkali-silica reaction to be inhibited effectively, but the surface physichemistry effect only make alkali-silica reaction to be delayed. The chemistry effect and the physichemistry effect of mineral admixture are closely relative to the content of Ca(OH)₂ in system. Under the condition that there is a large quantity of Ca(OH)₂ in system, the mineral admixture cannot inhibit alkali-silica reaction effectively. Only when the Ca(OH)₂ in the system is very small, it is possible that the mineral admixture can inhibit alkali-silica reaction effectively.