Study on the early volume stability of cement-based materials during CO2 curing

被引：0
|
作者：
Yang, Ziyuan [1 ,2 ]
Zhang, Jiayi [1 ,2 ]
Qin, Ling [3 ]
Chen, Tiefeng [1 ,2 ]
Gao, Xiaojian [1 ,2 ]
机构：
[1] Harbin Inst Technol, Sch Civil Engn, Harbin 150090, Peoples R China
[2] Harbin Inst Technol, Key Lab Smart Prevent Mitigat Civil Engn Disasters, Minist Ind & Informat Technol, Harbin 150090, Peoples R China
[3] Qingdao Univ Technol, Sch Civil Engn, Qingdao 266000, Peoples R China
来源：
JOURNAL OF BUILDING ENGINEERING | 2024年 / 95卷
基金：
黑龙江省自然科学基金; 中国国家自然科学基金;
关键词：
Carbonation curing; Cement-based materials; Drying shrinkage; Fly ash; Early age; DRYING SHRINKAGE; MICROSTRUCTURE; STRENGTH;
D O I：
10.1016/j.jobe.2024.110354
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
In this study, the impact of carbonation curing regime and fly ash dosage on the volume stability of concrete was investigated. The shrinkage of cement pastes specimens incorporating 0-30 % fly ash after 2-24 h pre-conditioning and 4-24 h carbonation curing was experimentally determined. Carbonation curing can lead to a maximum increase of 39.4 % on dry shrinkage of cement paste compared to the standard-cured ones. Prolonged carbonation curing can also enlarge the average and critical pore sizes by 123.4 % and 697.8 %, respectively. The water penetration of prolonged carbonation-cured cement mortar was increased by 56.1 %, consequently. However, appropriate carbonation curing increased compressive strength and sequestered CO2 2 effectively. The addition of an appropriate dosage of low-calcium fly ash can mitigate the adverse impact of carbonation curing on the volume stability of cement paste.
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页数：13
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