Effect of polycarboxylate-type superplasticizer on the paste fluidity based on the water film thickness of flocs  

作　　者：WU Qiong AN XueHui LIU ChunNa 

机构地区：[1]State Key Laboratory of Hydroscience and Engineering,Tsinghua University

出　　处：《Science China(Technological Sciences)》2014年第8期1522-1531,共10页中国科学（技术科学英文版）

基　　金：supported by the National High-Tech Research and Development Program of China("863" Project)(Grant No.2012AA06A112);the National Natural Science Foundation of China(Grant No.51239006);the National Key Laboratory in China(Grant No.2012-Ky-02)

摘　　要：The excess water film theory and the properties of flocs are integrated to examine the effect of the polycarboxylate-type superplasticizer on the paste fluidity. The theory states that excess water can surround the flocs rather than the particles and that the cell consists of a floc and a superficial water film. Experiments on limestone powder pastes were conducted to verify the theory. The superplasticizer dosage （sp%） and the water-powder ratio by volume （Vw/Vv） were systematically varied. A sedimentation balance method was used to measure the size distribution of the flocs in the limestone powder pastes. The water film thickness （WFT） of flocs was then calculated and shown to determine the paste fluidity. Based on this WFT of flocs, the effect of the sp on the paste fluidity was determined and then compared with the effect of water.

关 键 词：water film thickness of flocs SUPERPLASTICIZER sedimentation balance method FLUIDITY limestone powder paste 

分 类 号：TU528.042.2[建筑科学—建筑技术科学]