摘要
粉煤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.本文采用电声法zeta电位仪测定了不同掺量的粉煤灰与不同掺量的聚羧酸减水剂(PCA)对水泥水化早期zeta电位的影响,并同时测定水泥水化溶液体系的电导率,以此来判定粉煤灰按照一定比例替代水泥后对水泥-减水剂体系水化早期Zeta电位的影响情况.结果表明,粉煤灰总体会降低水泥水化早期的zeta电位值,在水化体系的zeta电位和电导率测试结果中粉煤灰与聚羧酸减水剂表现出一定的协同作用效果,有助于改善混凝土的和易性.
Fly ash, as commonly used active mineral admixture of concrete, has been widely used in green high performance concrete. In this paper, it has measured the zeta potential values of different dosages of fly ash with different amounts of polycarboxylic acid water reducing agent（PCA） to the influence of the cement hydration at early age by the electro-acoustic method, and measured the electrical conductivity in the system of cement hydration solution at the same time. The results showed that, fly ash can reduce the zeta potential of early cement hydration, fly ash with polycarboxylic acid water reducing agent showed certain synergy effect in measured of the zeta Potential and conductivity, and contribute to the improvement of the workability of concrete.
出处
《新疆大学学报（自然科学版）》
CAS
北大核心
2015年第2期146-150,253,共5页
Journal of Xinjiang University(Natural Science Edition)
基金
国家自然科学基金(51268055)资助
关键词
粉煤灰
聚羧酸减水剂
ZETA电位
电导率
fly ash
polycarboxylate superplasticizer
zeta potential
conductivity
