硫酸盐对不同侧链分子量聚羧酸减水剂分散性的影响  

Influence of Sulfate on the Dispersity of Polycarboxylate Superplasticizer of Different Side Chain Molecular Weight

作　　者：郑洪伟[1] 江楠[2] 王智[2] 

机构地区：[1]广州珠江实业集团有限公司,广州510095 [2]重庆大学化学化工学院,重庆400044

出　　处：《硅酸盐通报》2013年第12期2578-2582,2594,共6页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金项目(50972170);国家自然科学基金重点项目(51132010)

摘　　要：通过测定Na2SO4和CaSO4·2H2O对掺侧链分子量不同的聚羧酸减水剂时水泥净浆流动度及砂浆扩展度的影响来表征硫酸盐对聚羧酸减水剂分散性的影响。结果发现:硫酸盐对聚羧酸减水剂的减水分散性能有不利影响;Na2SO4对聚羧酸减水剂分散性的负面影响较CaSO4·2H2O更显著;此外,侧链分子量较大的聚羧酸减水剂对Na2SO4更加敏感。By measuring the effect of Na2SO4 and CaSO4· 2H2O on fluidity of cement paste and extension of cement mortar with polyearboxylate superplasticizers of different side chain molecular weight, a conclusion can be drawn that sulfates have negative effect on the water reducing performance of polycarboxylate superplasticizer. Compared with CaSO4 · 2H2O, Na2SO4 displayed a more pronounced negative effect on dispersity of polycarboxylate superplasticizer. What ‘s more, polycarboxylate superplasticizers with larger side chain molecular weight are more sensitive to sulfates.

关 键 词：硫酸盐 聚羧酸减水剂 分散性 

分 类 号：TU525[建筑科学—建筑技术科学]