Performance Enhancement of Recycled Concrete Aggregates through Carbonation

被引：263
|
作者：
Zhang, Jiake [1 ]
Shi, Caijun [1 ]
Li, Yake [2 ]
Pan, Xiaoying [1 ]
Poon, Chi-Sun [3 ]
Xie, Zhaobin [4 ]
机构：
[1] Hunan Univ, Coll Civil Engn, Changsha 410082, Hunan, Peoples R China
[2] WOWA Int Engn & Consulting Co Ltd, Guangzhou 518067, Guangdong, Peoples R China
[3] Hong Kong Polytech Univ, Dept Civil & Environm Engn, Kowloon 518057, Hong Kong, Peoples R China
[4] Cent South Univ Forestry & Technol, Coll Civil Engn & Mech, Changsha 410004, Hunan, Peoples R China
来源：
JOURNAL OF MATERIALS IN CIVIL ENGINEERING | 2015年 / 27卷 / 11期
关键词：
Recycled concrete aggregate; Carbonation treatment; Physical properties; Mechanical properties; CEMENTITIOUS MATERIALS; KINETICS; SHRINKAGE; SURFACE;
D O I：
10.1061/(ASCE)MT.1943-5533.0001296
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
The cement paste attached to natural aggregates has a significant effect on the quality of recycled concrete aggregates (RCAs) because it usually has higher porosity and lower strength than natural aggregates. This work attempted to improve the quality of RCAs through carbonation of the attached cement paste. During carbonation reactions, CO2 reacted with Ca(OH)(2) and calcium silicate hydrate (C-S-H) to form CaCO3 and silica gel, which filled the pores in the attached cement paste. Thus, carbonation increased the density, and decreased the water absorption and crushing values of the RCAs. It, thus, increased the flowability and compressive strength and decreased drying shrinkage of the recycled aggregate mortars. (C) 2015 American Society of Civil Engineers.
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页数：7
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