Strength-promoting mechanism of alkanolamines on limestone-calcined clay cement and the role of sulfate

被引：51

作者：

Huang, Hong ^{[1
]}

Li, Xuerun ^{[2
]}

Avet, Francois ^{[2
]}

Hanpongpun, Wilasinee ^{[2
]}

Scrivener, Karen ^{[2
]}

机构：

[1] Chongqing Univ, Coll Mat Sci & Engn, Chongqing 400044, Peoples R China

[2] Swiss Fed Inst Technol Lausanne EPFL, Lab Construct Mat, Stn 12, CH-1015 Lausanne, Switzerland

来源：

CEMENT AND CONCRETE RESEARCH | 2021年 / 147卷

基金：

中国国家自然科学基金;

关键词：

Limestone-calcined clay cement; Alkanolamines; Strength; Hydration; Microstructure; COMPRESSIVE STRENGTH; HYDRATION KINETICS; FLY-ASH; S-H; METAKAOLIN; TRIISOPROPANOLAMINE; PERFORMANCE; IMPACT;

D O I：

10.1016/j.cemconres.2021.106527

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

This paper reports the strength-promoting mechanism of alkanolamines on limestone-calcined clay cement (LC3). The hydration kinetics, phase formation and microstructure of LC3 with triethanolamine (TEA) or triisopropanolamine (TIPA) were investigated. TEA enhanced the strength of LC3, while TIPA was effective at 28 days, and a correct sulfate addition promoted their effects. Alkanolamines accelerated the aluminate reaction of LC3 during early hydration, increased sulfate slowed this reaction by producing more ettringite. TIPA favoured the hydration of ferrite in clinker, not only accelerated the silicate reaction of metakaolin, but also resulted in a rapid limestone reaction. Alkanolamines altered the morphology and chemical composition of the aluminate hydrates and C-A-S-H. Alkanolamines enabled the reduction of porosity of hardened pastes and the increased sulfate further refined them. It was the large pores being induced by TIPA at early ages that were considered to have an adverse impact on the early strength of LC3.

引用

页数：13

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