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.
出处
《混凝土》
CAS
CSCD
北大核心
2013年第2期82-84,90,共4页
Concrete
关键词
聚羧酸
流动度
吸附
polycarboxylic acid
fluidity
adsorption
