Study on the compatibility of cement-superplasticizer system based on the amount of free solution

查看全文 作　　者：HAN Song YAN PeiYu KONG [1]XiangMing

机构地区：[1]Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry, Department of Civil Engineering, Tsinghua University, Beijing 100084, China

出　　处：《Science China(Technological Sciences)》索引2011年第54卷第1期,共7页

基　　金：supported by the National Natural Science Foundation of China (Grant No.50772053) 摘　　要：The changes of free solution amount,fluidity and the time-depended fluidity loss of cement paste were examined by varying the water-cement ratio and the dosages of superplasticizer. The distribution of solution and flocculation microstructure in fresh cement paste was observed with optical microscope. The change of free solution amount and its effect on the fluidity and bleeding of cement paste was studied. The results show that the adsorbed solution amount has a great influence on the compatibility of cement-superplasticizer system,including the bleeding degree,the fluidity and the time-depended fluidity loss of cement paste. Superplasticizer increases the fluidity of cement paste by destroying the flocculated cement particle structure and increasing the amount of adsorbed solution. Polycarboxylate superplasticizer shows higher ability of adsorption than naphthalene superplasticizer. Over dosage of superplasticizer is not the primary cause of bleeding. The principle reason of bleeding is the high water-cement ratio and the insufficient enhancing ability of water adsorption of superplasticizer. 关键词：高效减水剂系统兼容性水泥浆体溶液自由流动性损失基础吸附能力

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Study on the compatibility of cement-superplasticizer system based on the amount of free solution

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