磨细矿渣对现场活性骨料碱-硅反应的抑制

摘要

Inhibition effect of different volume of ground slag( GSL)on alkaline silica reaction of field active aggregate was studied, and compared with normal mortar. The results show that the inhibiting effect enhanced with increasing ground slag, and while the added volume is up to and more than 50％, the expansion rate of the mortar specimens is less than 0.10％ after its curing time of 28 days. The inhibition mechanism of ground slag on the alkaline silica reaction is well expounded by press filtration test and energy dispersive spectroscopy (EDS) analysis.That is, the increase of groud slag can make the content of K + and Na + in pore solution and the ratio of n (Ca)to n(Si) in C-S-H Gel decrease.%研究了不同掺量磨细矿渣对现场活性骨料碱-硅反应的抑制效能,并与普通砂浆进行对比.结果表明:磨细矿渣对骨料碱-硅反应的抑制作用,随磨细矿渣掺量的增加而增强,当磨细矿渣掺量达到50%及以上时,砂浆试件28 d膨胀率小于0.10%.压滤试验和能谱分析充分解释了磨细矿渣对活性骨料碱-硅反应的抑制机理,抑制机理主要是孔溶液中K+,Na+浓度的降低和水化产物中低n(Ca)/n(Si)比的C-S-H凝胶的形成.