Synthesis and Mechanism of Shrinkage-Reducing Polycarboxylate Superplasticizer

被引：0
|
作者：
Ge H. [1 ,2 ]
Sun Z. [1 ,2 ]
Yang H. [1 ,2 ]
Zheng K. [3 ]
Zhang T. [1 ,2 ]
Cao Y. [4 ]
机构：
[1] School of Materials Science and Engineering, Tongji University, Shanghai
[2] Key Laboratory of Advanced Civil Engineering Materials, Ministry of Education, Tongji University, Shanghai
[3] CREEC (Chongqing) Survey, Design and Research CO., Ltd., Chongqing
[4] Jiangsu Chengyi Group Co., Ltd., Jiangsu, Xuzhou
来源：
Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | 2023年 / 51卷 / 05期
关键词：
free radical polymerization; mechanism; molecular structure design; shrinkage reducing polycarboxylate superplasticizer; surface tension;
D O I：
10.14062/j.issn.0454-5648.20220922
中图分类号：
学科分类号：
摘要：
To provide a theoretical reference for reducing the shrinkage and cracking of concrete and promoting the development and application of the shrinkage-reducing polycarboxylate superplasticizer, a shrinkage-reducing polycarboxylate superplasticizer (SR-PCE) with dispersion and shrinkage reducing properties was synthesized via free radical polymerization with isopentenyl polyoxyethylene ether (IPEG), acrylic acid (AA), butyl acrylate (BA) and other monomers. The molecular structure of SR-PCE was characterized by gel permeation chromatography and Fourier transform infrared spectroscopy, and its shrinkage reduction mechanism was analyzed. The results show that the molecular structure of SR-PCE is a designed structure. The optimum shrinkage reducing performance of the synthesized PCE can be obtained at a molar ratio of IPEG:AA:BA of 1:5:4. The mechanism of SR-PCE with the optimum shrinkage reducing performance mainly is since SR-PCE can further reduce the surface tension of the solution rather than ordinary PCE, SR-PCE can reduce the evaporation rate of the pore solution of cement paste and improve the pore water retention. © 2023 Chinese Ceramic Society. All rights reserved.
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页码：1293 / 1301
页数：8
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