Mechanism of triethanolamine on Portland cement hydration process and microstructure characteristics

被引：115

作者：

Han, Jianguo ^{[1
,2
]}

Wang, Kejin ^{[2
]}

Shi, Jiyao ^{[3
]}

Wang, Yue ^{[3
]}

机构：

[1] Tsinghua Univ, Dept Civil Engn, Beijing 100084, Peoples R China

[2] Iowa State Univ, Dept Civil Construct & Environm Engn, Ames, IA 50014 USA

[3] China Railway Tunnel Co Ltd, Ctr Technol, Luoyang 471000, Peoples R China

来源：

CONSTRUCTION AND BUILDING MATERIALS | 2015年 / 93卷

关键词：

TEA; Acceleration; Hydration; Microstructure; AFt; AFm;

D O I：

10.1016/j.conbuildmat.2015.06.018

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Influence of triethanolamine (TEA) on Portland cement hydration heat evolution process, hydration product, pore structure, setting time and concrete strength were investigated; and mechanism of TEA on the cement hydration process and microstructure is discussed. Research results indicate that TEA accelerates hydration process of C(3)A and retards that of C3S, such effects enhance with the increase of TEA dosage. TEA also promotes rate of AFt formation and its conversion to AFm. As a result, TEA accelerates setting of cement paste but jeopardizes strength of concrete. Depending on its dosage, TEA can either optimize or harm cement paste pore structure. The types of calcium sulfoaluminate hydrate (AFt or AFm) produced in cement paste containing TEA depends on the abundance of calcium sulfate, before depletion of calcium sulfate, AFt is produced, after that, AFm is produced (converted from AFt). (C) 2015 Elsevier Ltd. All rights reserved.

引用

页码：457 / 462

页数：6

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