Preparation of Polycarboxylate-based Superplasticizer and Its Effects on Zeta Potential and Rheological Property of Cement Paste  

作　　者：刘明 雷家珩 BI Yao DU Xiaodi ZHAO Qinglin ZHANG Xuqing 

机构地区：[1]School of Materials Science and Engineering, Wuhan University of Technology [2]School of Chemistry, Chemical Engineering and Life Science, Wuhan University of Technology [3]Wuhan Green Construction Chemicals Co.,LTD

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2015年第5期1008-1012,共5页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the Western Region Traffic Construction Technology Program of the Ministry of Communications of China(No.2007319811130)

摘　　要：A series of polycarboxylate-based superplasticizers(PCs) with different structures were synthesized and the effects of chemical structure on zeta potential and rheological property of cement paste were studied. Residual monomers in each sample of PCs were quantitatively determined. The property of the polymers in cement was tested by micro-electrophoresis apparatus and R/S rheometer. Results showed that the zeta potential and its rheological properties are related with the side-chain length and density of PCs. The PCs having shorter side chain and lower side chain density exhibit higher anionic charge density, thus resulting in higher zeta potential. The effect of side chain density on zeta potential is more notable compared with that of side-chain length, and thus affecting the initial shear yield stress and apparent viscosity of the cement paste. In addition, although increasing the side chain length will result in reduction of the anionic charge density, the steric hindrance effect is obvious, which can effectively improve the dispersion of the cement particles, and reduce the viscosity and shear yield stress of slurry.A series of polycarboxylate-based superplasticizers(PCs) with different structures were synthesized and the effects of chemical structure on zeta potential and rheological property of cement paste were studied. Residual monomers in each sample of PCs were quantitatively determined. The property of the polymers in cement was tested by micro-electrophoresis apparatus and R/S rheometer. Results showed that the zeta potential and its rheological properties are related with the side-chain length and density of PCs. The PCs having shorter side chain and lower side chain density exhibit higher anionic charge density, thus resulting in higher zeta potential. The effect of side chain density on zeta potential is more notable compared with that of side-chain length, and thus affecting the initial shear yield stress and apparent viscosity of the cement paste. In addition, although increasing the side chain length will result in reduction of the anionic charge density, the steric hindrance effect is obvious, which can effectively improve the dispersion of the cement particles, and reduce the viscosity and shear yield stress of slurry.

关 键 词：comb polymer polycarboxylate-based superplasticizers zeta potential cement dispersant rheological property 

分 类 号：TU528[建筑科学—建筑技术科学]