含疏水侧链聚羧酸减水剂对混凝土含气量的影响

关键字：疏水,侧链,聚羧酸,减水剂,混凝土

（1. 江苏建筑职业技术学院，江苏　徐州　 221116；2.徐州方圆工程监理公司，江苏　徐州　　221116）

 
    摘要：以异戊烯醇与环氧丙烷及环氧乙烷开环聚合制得疏水改性的环氧乙烷-环氧丙烷嵌段聚醚，进一步与丙烯酸、甲基烯丙基磺酸钠进行水溶液自由基共聚，合成侧链疏水改性的减水剂。考察了丙烯酸与改性聚醚比例、环氧丙烷疏水链段数目对减水剂分散性、表面活性和混凝土含气量的影响。结果表明，侧链疏水改性聚羧酸具有优异的分散及分散保持性、较低的表面张力，能够显著地降低混凝土的含气量，并提高混凝土的抗压强度。
    关键词：聚羧酸减水剂；疏水侧链；表面张力；含气量
    中图分类号：TU528.042+.2        文献标识码：A        文章编号：1001-702X（2017）11-0017-03
 

Effect of polycarboxylate superplasticizer with hydrophobic side chains on air content of concrete
XU Nan1，2
（1.Jiangsu Vocational Institute of Architectural Technology，Xuzhou 221116，China；

2.Xuzhou Fangyuan Construction Project Supervision Company，Xuzhou 221116，China）

    Abstract：Hydrophobically modified block polyether was prepared by ring opening polymerization of prenyl alcohol with propylene oxide and epoxy ethylene，and therefore copolymerized with acrylic acid and methyl allyl sulfonic acid by free radical copolymerization to synthesize a water reducing agent with hydrophobic modification side chains. The influence of the molar ratio of acrylic acid to modified polyether and the number of hydrophobic segments on the cement dispersion ability，surface activity and concrete air content was investigated. It was found that polycarboxylate superplasticizer with hydrophobic side chains has excellent dispersing ability，and lower surface tension，which can significantly reduce the air content of concrete and increase the compressive strength of concrete.
    Key words：polycarboxylate superplasticizer，hydrophobic side chains，surface tension，air content