聚羧酸系超塑化剂分子结构对水泥净浆流动度的影响  

Effect of cement paste fluidity by different molecular structure of polycarboxylic acid type superplasticizer

作　　者：陆加越[1,2] 沙建芳[1,2] 冉千平[1,2] 刘加平 

机构地区：[1]江苏省建筑科学研究院高性能土木工程材料国家重点试验室,江苏南京210008 [2]江苏博特新材料有限公司,江苏南京210008

出　　处：《混凝土》2013年第2期82-84,90,共4页Concrete

摘　　要：研究了不同分子结构的聚羧酸系超塑化剂对水泥净浆流变性能的影响,通过测试掺入外加剂的水泥净浆的初始流动度和流动度损失,以及测量PCA在水泥颗粒表面的吸附,结果表明:甲基丙烯酸主链的PCA初始流动度和流动度保持性能最好;相同主链结构长度,不同侧链比例的PCA对流动度影响存在最佳支链比例,(b)型主链当x/y=3时,流动度最大,(d)型主链当x/y/z=65/20/15时,流动度最大。是影响吸附的关键基团,吸附率大小取决于该基团的数量。Property of cement paste by different molecular structure of polycarboxylic acid type superplasticizer was studied.The mi-ni-slump, mini-slump loss ratio and PCA adsorption ratio on the surface of cement were tested.The research result showed that, PCA which used methacrylic acid as the main chain had the best fluidity and keeping,the ,same length and structure of main chain,there was a optimum value of the different side chain ratio, for（b）type main chain,when x/y=3 ,the mini-slump achieved the top, for（d）type main chain,when x/y/z=65/20/15, the mini-slump reached the peak value.was the key group of effect adsorption, the adsorption ratio ofPCA was dependent on the quantity of the group.

关 键 词：聚羧酸 流动度 吸附 

分 类 号：TU528.042.2[建筑科学—建筑技术科学]