新型木聚系高效减水剂与水泥的适应性  

Compatibility between New Lignosulfate Graft Copolymer Superplasticizers and Cements

作　　者：冯世虎[1] 张云升[1] 朱薇薇[1] 

机构地区：[1]东南大学江苏省土木工程材料重点实验室,江苏南京211189

出　　处：《建筑材料学报》2010年第3期385-389,394,共6页Journal of Building Materials

基　　金：江苏省成果转化基金资助项目(BA2008090);江苏省交通工程科技项目(07Y23)

摘　　要：通过微型坍落度筒试验,探讨了水泥中混合材种类(粉煤灰和矿渣)及掺量、碱含量、C3A含量和水泥细度对木聚系高效减水剂(LGCS)与水泥适应性的影响.结果表明:随混合材掺量的增大,掺LGCS水泥净浆流动度显著提高,LGCS与水泥适应性增强;随碱含量的升高,掺LGCS水泥净浆流动度迅速降低,LGCS与水泥适应性呈劣化趋势,其中以掺木聚脂肪族高效减水剂(LGAS)水泥净浆表现最为明显;C3A含量的增大使得掺LGCS水泥净浆流动度逐渐降低,流动度损失加快;水泥细度提高使得掺LGCS水泥净浆流动度下降,其中掺LGAS水泥净浆初始流动度降幅较大,掺木聚羧酸系高效减水剂(LGPS)水泥净浆流动度损失较快.Through mini-slump cone test,the main factors influencing the compatibility between lignosulfate graft copolymer superplasticizers（LGCS） and cements were studied,including the types and the use level of admixtures（fly ash and slag）,alkali content,C3A content,and cement fineness.It is found that the fluidity of cement paste with LGCS is significantly improved with the increase in the use level of admixtures,showing that the compatibility is enhanced.With the alkali content increasing,the fluidity decreases rapidly and the compatibility shows a trend of deterioration,particularly by the addition of lignosulfate graft aliphatic superplasticizer（LGAS）.The growth of C3A content makes the fluidity gradually reduce and the loss of fluidity accelerates.The fluidity descends when the cement is ground fine,and the initial fluidity of the paste with LGAS becomes much lower and the fluidity of the paste with lignosulfate graft polycarboxylate superplasticizer（LGPS） decreases much faster.

关 键 词：高效减水剂 适应性 混合材 碱含量 C3A 细度 

分 类 号：TU528.042.2[建筑科学—建筑技术科学]