硅灰对水泥净浆与砂浆性能及砂浆结构影响的研究

探讨不同掺量的硅灰对水泥净浆与砂浆性能及砂浆结构的影响.结果表明:掺入硅灰可以减缓水泥早期水化反应速度,使水化产物减少,结构疏松,使水泥砂浆早期强度有所下降.掺入适量的硅灰可以提高水泥后期水化反应速度,使水化产物增多,提高水泥砂浆的密实度,并能促使水化反应长期进行,从而提高水泥砂浆的后期与长期强度;硅灰的优化掺量为8%.掺入硅灰会降低水泥净浆的流动性,增加水泥的凝结时间,但水泥的安定性均为合格.

STUDY ON EFFECT OF SILICA FUME ON STRUCTURE AND PROPERTIES OF CEMENT MORTAR AND PROPERTIES OF CEMENT PASTE

The effect of the content of silica fume on the structure and property of the cement mortar and property of the cement paste were investigated. The results shows that the early stage rate of hydrated reaction is reduced to decrease the content of hydrated product and make the structure sparse, so that the early strength of cement mortar is reduced by adding silica fume to cement. The late stage rate of hydrated reaction is improved to increase the content of hydrated product and increase compactness of cement mortar, so that the late age strength of cement mortar is increased by adding proper content of silica fume to cement. The hydrated reaction can continue for long time, so that the long age strength of cement mortar is increased by adding proper content of silica fume to cement. The optimized content of silica fume is 8 %. The flowability of cement paste is reduced and the setting time of cement is increased but the soundness is acceptable by adding silica fume to cement.