硅灰对水泥 - 减水剂体系水化早期Zeta电位的影响研究.pdfVIP

学兔兔 2014年第 4期(总第 294期 ) 混 凝 土 原材料及辅助物料 Number 4 in 2014(Tota1 No．294) Concrete MATERIAL AND ADMINICLE 硅灰对水泥一减水剂体系水化早期Zeta电位的 影响研究 温 勇，李 梅。张广泰，董海蛟，唐 巍 (新疆大学 建筑工程学院，新疆 乌鲁木齐 830047) 摘 要： 硅灰作为常用的活性矿物掺合料，在当前配制绿色高性能混凝土中得到了广泛的应用。采用电声法测定了不同掺量的 硅灰与不同掺量的减水剂对水泥早期水化Zeta电位的影响，并同时测定水泥水化溶液体系的电导率，以此来判定拥有巨大比表 面积的硅灰按照一定比例替代水泥后对水泥一减水剂体系水化早期Zeta电位的影响情况。结果表明：自身Zeta电位呈强负电的硅 灰提高了水泥水化早期的Zeta电位值；在对FDN一水泥水化体系的影响中主要表现为降低该溶液体系的Zeta电位的绝对值； 而对PeA一水泥水化体系的影响中则主要表现为促进该溶液体系的电导率。 关键词： 硅灰；电声法；Zeta电位；电导率 中图分类号： TU528．041 文献标志码： A 文章编号： 1002—3550(2014)04—0097—05 Influence of silica fume on Zeta potential of early superplasticiser-cement hydration WENYong，LIMei，ZHANGGuangtai，DONGHaijiao，TANGWei (Civil Construction College ofXinjiang University，Urumchi 830047，China) Abstract： Silica fume，as all activity mineral admixtures of common used，has been widely used in the current producing of green high performance concrete．In this paper，it has measured the Zeta potential values of different dosages of silica fume with different superplasti— cizer amounts to the influence ofthe cement hydration at early age by the electro—acoustic method，and measured the electrical conductivity in the system ofcement hydr~ion solution at the same time．According to the above，it could be thejudgment ofthe influence conditions of Zeta potential in the cement—superplasicizer system after the silica fume which owing huge specific surface area in certain proportion to re·- place cement in the early hydration age．The results showed that，the silica fume which showed the neg~ive charge itself could increased the Zeta potential values in cemen