摘要
采用了水溶液自由基共聚方法合成了一种异戊烯醇聚氧乙烯醚基聚羧酸类减水剂,考察了聚合工艺对聚羧酸减水剂在水泥中分散性的影响,采用NMR测试了聚合物的分子结构以及采用GPC法测试了聚合物的分子量和大单体的转化率,测试了减水剂在不同水泥中的适应性。性能测试结果表明,合成的减水剂在混凝土中具有优异的减水性能,掺量为0.3%时,P.O 42.5级水泥的减水率达到28.6%,掺量为0.4%时,减水率达到31.9%。减水剂在各种水泥的适应性中相比较而言,在P.C中的适应性相对略有差别,在标准水泥和P.S中的适应性最好,减水剂掺量在0.2%~0.4%时,标准水泥和P.S的减水率相差无几,掺量为0.3%时,二者减水率均达到34%左右。
A kind of water reducing agent based on isoprene alcohol polyethylene glycol were synthesized in water solution by radical copolymerization.The influence of copolymerization conditions on dispersing performance of the water reducing agent in the cement was investigated.NMR was used to determine the molecular structure of the copolymer,GPC was used to determine copolymer molecular weight and big monomer percent conversion.Testing the water reducing agent in the different cement adaptability.Test results showed that the water reducing agent possess good performance in concrete.When the dosage of water reducing agent was 0.3%,the water reducing ratio of P.O 42.5 cement was 28.6%.In comparison,the water reducing agent in all kinds of cement in the adaptability,the water reducers adaptability was the worst in P.C cement,the second was P.O cement,the adaptability was the best in standard cement and P.S cement.When the dosage of water reducing agent was 0.2%~0.4%,the water reducing ratio was about the same.
出处
《混凝土》
CAS
CSCD
北大核心
2013年第7期41-43,共3页
Concrete
基金
国家科技支撑计划项目(2011BAJ05B03)
吉林省科技发展计划项目(20120419)
关键词
异戊烯醇聚氧乙烯醚
聚羧酸减水剂
减水率
适应性
isoprene alcohol polyethylene glycol
polycarboxylate water reducer
water reducing ratio
adaptability
