A comparison of liquid-solid and gas-solid accelerated carbonation for enhancement of recycled concrete aggregate

被引：137

作者：

Liu, Songhui ^{[1
,2
]}

Shen, Peiliang ^{[1
]}

Xuan, Dongxing ^{[1
]}

Li, Long ^{[1
]}

Sojobi, Adebayo ^{[1
]}

Zhan, Baojian ^{[3
]}

Poon, Chi Sun ^{[1
]}

机构：

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

[2] Henan Polytech Univ, Sch Mat Sci & Engn, Henan Key Lab Mat Deep Earth Engn, Jiaozuo, Henan, Peoples R China

[3] Shenzhen Univ, Coll Civil & Transportat Engn, Guangdong Prov Key Lab Durabil Marine Civil Engn, Shenzhen, Peoples R China

来源：

CEMENT & CONCRETE COMPOSITES | 2021年 / 118卷

关键词：

Liquid-solid carbonation; Gas-solid pressurized carbonation; Recycled concrete aggregate; Recycled aggregate concrete; Interface; CEMENT PASTE; DICALCIUM SILICATE; CALCIUM-CARBONATE; LIMESTONE POWDER; CO2; HYDRATION; MICROSTRUCTURE; BEHAVIOR; PERFORMANCE; HYDROXIDE;

D O I：

10.1016/j.cemconcomp.2021.103988

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

To enhance the properties of recycled concrete aggregates (RCA), a liquid-solid carbonation process was developed and compared with the conventional gas-solid pressurized carbonation method. The performance of RCA and the recycled aggregate concrete (RAC) prepared with the carbonated RCA by the two aforementioned carbonation methods was evaluated. The carbonation products assemblage, microstructure and porosity evo-lution were first characterized. The results indicated that after subjecting to a 10-min liquid-solid carbonation process, a reduction of 12.2% in RCA water absorption and an increase of 2.6% in density were achieved, which were more efficient when compared to the 24-h gas-solid pressurized carbonation. More importantly, the compressive strength of RAC prepared with the 6-h liquid-solid carbonated RCA was significantly improved. In light of microstructural analysis, the enhanced performance of RAC was attributed to more additional mono -carbonate (Mc) and C?S?H gel formed at the interface between the liquid-solid carbonated RCA and the new cement pastes.

引用

页数：14

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