粉煤灰对水泥-聚羧酸减水剂体系早期Zeta电位和电导率的影响研究Influence of Fly Ash on Zeta Potential and Conductivity of Early Polycarboxylate Superplasticizer-Cement Hydration
温勇;邓雷;韩国旗;
摘要(Abstract):
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.
关键词(KeyWords): 粉煤灰;聚羧酸减水剂;zeta电位;电导率
基金项目(Foundation): 国家自然科学基金(51268055)资助
作者(Authors): 温勇;邓雷;韩国旗;
DOI: 10.13568/j.cnki.651094.2015.02.04
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