Effect of Mineral Admixtures on Rheological Properties of Paste with Low Water-Binder Ratio and Its Mechanism
ZHANG Qianqian1,2, LIU Jianzhong1,2, ZHANG Lihui1,2, LIU Jiaping2,3
1 Jiangsu Sobute New Materials Co. Ltd., Nanjing 211103, China 2 State Key Laboratory of High Performance Civil Engineering Materials, Nanjing 210008, China 3 School of Materials Science and Engineering, Southeast University, Nanjing 210096, China
Abstract: The effect of silica fume, fly ash and ground slag on rheological properties of cement paste with low water-binder ratio was investigated. In order to study its mechanism, the minimum water demand method was employed to test wet packing density of particles in paste and the water film thickness on the surface of particles. The results show that cement paste with low water-binder ratio showed typical shear-thickening beha-vior. The addition of silica fume increased yield stress and viscosity, decreased the exponent n, and then the paste exhibited a shear-thinning behavior. The addition of fly ash decreased yield stress and viscosity, but had no significant effect on the exponent n. Water film thickness, which could evaluated the combined effects of packing density and solid surface area, was one of the key factors affecting rheological properties of paste, and yield stress and viscosity decreased with the decreasing of water film thickness. Water film thickness decreased with the increasing silica fume content, but increased with the addition of fly ash and ground slag.
张倩倩, 刘建忠, 张丽辉, 刘加平. 矿物掺合料对低水胶比浆体流变性能的影响机制研究[J]. 材料导报, 2020, 34(22): 22054-22057.
ZHANG Qianqian, LIU Jianzhong, ZHANG Lihui, LIU Jiaping. Effect of Mineral Admixtures on Rheological Properties of Paste with Low Water-Binder Ratio and Its Mechanism. Materials Reports, 2020, 34(22): 22054-22057.
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2020, Vol. 34 
