硅酸盐通报2024，Vol.43Issue(1)：52-60,9.
减水保坍型聚羧酸减水剂的合成及性能研究
Synthesis and Properties of Water-Reducing and Slump-Protecting Polycarboxylate Superplasticizer
董建统 1刘志勇 1胡忠帅 1朱丹丹 1丁怡 1张伟强 1来福琨1
作者信息
- 1. 烟台大学土木工程学院,烟台 264003
- 折叠
摘要
Abstract
The water-reducing and slump-protecting polycarboxylate superplasticizer(V-HEA)was prepared by free-radical polymerization with 4-hydroxybutyl vinyl polyoxyethylene ether(VPEG)macromonomer and acrylic acid(AA)as the main raw materials by adding the slump-preserving monomer hydroxyethyl acrylate(HEA),and mercapto-propionic acid(MPA)as chain transferr agent under the H2 O2/L-vitamin C(Vc)oxidation-reductioninitiator system.The synthesized V-HEA was characterized by infrared spectroscopy,gel chromatography testing,and it was subjected to hydration heat analysis and concrete performance comparison analysis with commercially available slump-preserving polycarboxylate superplasticizer(HPWR-S).The results show that the optimal synthesis process parameters of V-HEA are acid-ether ratio of 4.4,ester-ether ratio of 2.5,and the dosage of initiator,ferrous sulfate and chain transfer agent accounted for 0.76％,0.10％and 0.74％of the mass of the macromonomer,respectively.The incorporation of ferrous sulfate could improve the conversion rate of monomers,and the number average molecular weight of V-HEA is 17 650,the weight average molecular weight is 42 713,and the conversion rate of monomers is as high as 95.03％.The peak temperature of hydration reaches by the incorporation of V-HEA is delayed by 4 h 24 min compared with HPWR-S,and the occurrence time of the second hydration rate peak is delayed by about 4 h,which further delays the hydration of cement.In comparison test of concrete performance,the 2 h slump only decreases by 5.8％with the addition of V-HEA,and the strength of concrete is comparable to that of HPWR-S products,so V-HEA has good application prospects.关键词
聚羧酸减水剂/VPEG大单体/自由基聚合/保坍型/分子结构表征/水化热分析Key words
polycarboxylate superplasticizer/VPEG macromonomer/radical polymerization/slump-preserving type/molecular structure characterization/hydration heat analysis分类
建筑与水利引用本文复制引用
董建统,刘志勇,胡忠帅,朱丹丹,丁怡,张伟强,来福琨..减水保坍型聚羧酸减水剂的合成及性能研究[J].硅酸盐通报,2024,43(1):52-60,9.
