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.

引用

页数：13

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