Effect of further water curing on compressive strength and microstructure of CO2-cured concrete

被引：165

作者：

He, Pingping ^{[1
,2
]}

Shi, Caijun ^{[1
,3
]}

Tu, Zhenjun ^{[1
,2
]}

Poon, Chi Sun ^{[2
]}

Zhang, Jiake ^{[1
]}

机构：

[1] Hunan Univ, Coll Civil Engn, Changsha 410082, Hunan, Peoples R China

[2] Hong Kong Polytech Univ, Dept Civil & Environm Engn, Kowloon, Hong Kong, Peoples R China

[3] China Bldg Mat Acad, State Key Lab Green Bldg Mat, Beijing 100024, Peoples R China

来源：

CEMENT & CONCRETE COMPOSITES | 2016年 / 72卷

关键词：

CO2; curing; Further water curing; Residual w/c ratio; Compressive strength; Microstructure; PORTLAND-CEMENT; FLY-ASH; HYDRATION; LIMESTONE; C(3)A; C3S;

D O I：

10.1016/j.cemconcomp.2016.05.026

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

This study aims to investigate the effects of further water curing on the compressive strength and microstructure of CO2-cured concrete. The results showed that concrete with a residual w/c ratio of 0.25 showed the most rapid strength development rate upon further water curing due to hydration of uncarbonated cement particles. Thermogravimetric, IR-spectrophotometric and scanning electron microscope examinations indicated that further hydration of the cement particles could form C-S-H gel and ettringite crystals. The results showed that the calcite formed during the initial CO2 curing was consumed during the further hydration of C(3)A, and produced calcium monocarbonaluminate hydrate. Also, Ca(OH)(2) was not detected due to its reaction with the formed silica gel. Mercury intrusion porosimetry test results indicated that the porosity and pore size of the CO2 cured mortar decreased further after water curing. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：80 / 88

页数：9

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