矿物掺合料和外加剂复合使用抑制ASR的效果研究

Research on the suppression effect of mineral and chemical admixture on alkali-silica reaction(ASR)

为研究矿物掺合料和外加剂复合使用抑制ASR的效果,应用CECS 48∶93标准,研究了粉煤灰和硅灰复合使用,粉煤灰、硅灰和高效减水剂复合使用,粉煤灰、硅灰和引气剂复合使用抑制ASR的效果.试验结果表明:当基准砂浆水胶比一定,且对比砂浆与基准砂浆具有相同流动度时:(1)粉煤灰和硅灰复合使用在一定程度上可以抑制ASR,粉煤灰掺量越高其抑制效果越明显.(2)粉煤灰、硅灰和高效减水剂复合使用时能够抑制ASR,其抑制效果优于粉煤灰、硅灰单独复合使用时的效果.(3)粉煤灰、硅灰和引起剂复合使用时能够抑制ASR,其抑制效果也优于粉煤灰、硅灰单独复合使用时的效果.

This paper is aimed at studying the suppression effect of mineral and chemical admixture on alkali -silica reaction （ASR） where the CECS 48 ： 93 is applied to research the alkali -silica reaction when the flying ash and the silica fume compound ,the flying ash,silica fume and high efficiency water reducing agent compound , the flying ash,silica fume and air entrain agent compound are added into blank mortar with high alkali cement and reactive aggregation. The blank mortar and the parallel mortar have the same fluidity and the water binder ratio of the blank mortar is not changed,. The experiment result indicated that（i） The flying ash and the silica fume compound can reduce the expansion value caused by alkali-silica reaction, but the suppression effect changing with the flying ash quantity in the mortar, the more flying ash is added to mortar,the more suppression effect is obvious （ii） The flying ash,silica fume and high efficiency water reducing agent compound can reduce expansion value caused by ASR ,in which the suppression effect is more obvious than flying ash and silica fume compound added into mortar lonely; （ ill）The flying ash, silica fume and air entrain agent are added into blank mortar, the suppression effect on ASR is also more obvious than the suppression effect of the flying ash and silica fume compound on AsR alone.