铁道科学与工程学报2017，Vol.14Issue(3)：465-472,8.
水泥-粉煤灰浆体流变特性及其机理研究
Rheological characteristic and its mechanism of cement-fly ash paste
摘要
Abstract
The rheological properties of cement-fly ash pastes were studied by a rotation viscometer with type of Rheolab QC. The influence of fly ash content and shear rate on rheological model, yield stress, plastic viscosity, thixotropy, critical shear rate and shear thickening were investigated. Results show that with fly ash content increasing, the linear dependent between shear stress and shear rate of compound paste based on Bingham model decreases. Yield stress, plastic viscosity, thixotropy and critical shear rate of cement-fly ash paste are on the decline with the increasing fly ash content. When fly ash content is 50%, all rheological parameters above are the lowest. Plastic viscosity of compound pastes shows remarkable shear thinning behavior under low shear rate. Plastic viscosity of pastes increases with shear rate increasing, and then the compound paste shows shear thickening behavior. With the increase of fly ash content, the critical shear rate of compound paste decreases, resulting in shear thickening in low shear rate. "Ball effect", "water reducing and lubricating effect" and "specific surface area effect" are the reasons causing the change of rheological properties of compound paste.关键词
流变/水泥/粉煤灰/机理Key words
rheology/cement/fly ash/mechanism分类
建筑与水利引用本文复制引用
马昆林,冯金,龙广成,谢友均,陈小波..水泥-粉煤灰浆体流变特性及其机理研究[J].铁道科学与工程学报,2017,14(3):465-472,8.基金项目
国家自然科学基金资助项目(51678569) （51678569）
国家重点基础研究发展规划(973 计划)项目(2013CB036201) （973 计划）
中南大学教师科学基金资助项目(2014JSJJ013) （2014JSJJ013）
