Effect of chain transfer agents in polycarboxylate superplasticizer on slump-retention of concrete

被引:1
|
作者
Pang, Jianjun [1 ]
Guo, Jintang [1 ,3 ]
Li, Wenke [2 ]
Chang, Qinglu [1 ]
机构
[1] Tianjin Univ, Sch Chem Engn & Technol, Tianjin, Peoples R China
[2] Chongqing Fupu New Mat Co Ltd, Chongqing, Peoples R China
[3] Tianjin Univ, Sch Chem Engn & Technol, Tianjin 100124, Peoples R China
来源
CANADIAN JOURNAL OF CHEMICAL ENGINEERING | 2023年 / 101卷 / 12期
基金
中国国家自然科学基金;
关键词
adsorption; chain transfer agent; chemical structure; polycarboxylate superplasticizer; slump-retention; ADSORPTION; DISPERSION; POLYMERS; IMPACT;
D O I
10.1002/cjce.25017
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Two types of slump-retention polycarboxylate superplasticizers (PC-M and PC-S) were synthesized by using 3-mercaptopropionic acid or sodium hypophosphite as chain transfer agents, the effects of polycarboxylate superplasticizers on slump-retention of cement and concrete were investigated, and the mechanism of action and the structure of polycarboxylate superplasticizers were investigated by using conductivity, complexing Ca2+ concentration, gel permeation chromatography (GPC), nuclear magnetic resonance hydrogen spectroscopy (H-1-NMR), and nuclear magnetic resonance phosphorus spectroscopy (P-31-NMR). The results indicated that the slump flow of cement paste mixed with PC-M was increased quickly within 60 min and then lost gradually, while PC-S increased slowly and evenly within 240 min. The slump flow of concrete mixed with PC-S reached 405 mm after 150 min, but the concrete mixed with PC-M was almost no fluidity after 150 min. The conductivity of the PC-M aqueous solution decreased quickly within 45 min, then slowly decreased, while the conductivity of the PC-S aqueous solution decreased slowly within 180 min. PC-M had a much greater complexation ability of Ca2+ than PC-S. The composition and structure of the two slump-retention polycarboxylate superplasticizers were altered by different chain transfer agents, and the hydrolysis-adsorption capacity of each component was different. The rate of hydrolyzation-adsorption of each component was PC-M-3 approximate to PC-S-3>PC-M-1>PC-M-2 approximate to PC-S-1>PC-S-2. The faster the adsorption rate, the faster the slump flow loss of concrete.
引用
收藏
页码:6919 / 6927
页数:9
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