硅酸盐通报2024，Vol.43Issue(1)：183-190,8.
硅灰对聚羧酸减水剂的吸附作用
Adsorption of Poly carboxylate Superplasticizer by Silica Fume
摘要
Abstract
Rapid and efficient dispersion of cementitious material containing large amounts of silica fume,microspheres,and other ultrafine powders is key technology for preparing ultra-high performance concrete.The interaction relation of polycarboxylate superplasticizer(PCE)and silica fume were studied by Zeta potential and total organic carbon method.The results show that surface charge of silica fume in water is negative,and has strong adsorption to PCE and its side chain monomer methacryloxypropyl polyethylene glycol ether(HPEG),while silica fume has weak adsorption to negatively charged main chain sodium polyacrylate(PAANa).In cement paste pore solution,the Zeta potential of silica fume is still negative,but the absolute value declines significantly,meanwhile the total adsorption amount of PCE and its side chain declines,while the adsorption amount of main chain increases.According to the fitting of Langmuir isotherm equation and theoretical calculation,it suggests that the adsorption of side chain structure of polycarboxylate by silica fume mainly comes from hydrogen bonding,which is weakened in cement paste pore solution.关键词
聚羧酸减水剂/硅灰/甲基烯丙基聚氧乙烯醚/Zeta电位/吸附Key words
polycarboxylate superplasticizer/silica fume/methacryloxypropyl polyethylene glycol ether/Zeta potential/adsorption分类
建筑与水利引用本文复制引用
张建纲,杨勇,毛永琳,周栋梁,李申振,王涛..硅灰对聚羧酸减水剂的吸附作用[J].硅酸盐通报,2024,43(1):183-190,8.基金项目
国家自然科学基金青年基金(52108218) （52108218）
