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硅酸盐超早强外掺剂(简称 SH)是上海近年试制的新品种,其主要矿物成分是C_(12)A_7和 CA,以及少量的 C_2S、C_2F、CT 和 mA 等,与适量石膏分别研磨后制成。在普通水泥中掺入一定量的 SH 外掺剂,可收到快硬和早强的效果,在较短的时间内获得比较理想的早期和后期抗压强度。为了保证操作过程所需的时间,必须同时掺入 SH外掺剂的缓凝剂。在试验研究中,我们优选了一种由硼酸和 SN-Ⅱ减水剂组成的 SH 外
Silicate super early admixture (abbreviated as SH) is a new type of trial in Shanghai in recent years, its main mineral components are C_(12)A_7 and CA, and a small amount of C_2S, C_2F, CT and mA, etc., and the appropriate amount of gypsum. Made after grinding. The incorporation of a certain amount of SH admixture into the ordinary cement can obtain the effects of rapid hardening and early strength, and can obtain relatively good early and late compressive strength in a short period of time. In order to ensure the time required for the operation process, a retarder of SH admixture must be incorporated at the same time. In the experimental study, we opted for a SH consisting of boric acid and SN-II water reducing agent.