Influence of carbonated recycled concrete aggregate on properties of cement mortar

被引：224
|
作者：
Zhang, Jiake [1 ]
Shi, Caijun [1 ]
Li, Yake [2 ]
Pan, Xiaoying [1 ]
Poon, Chi-Sun [3 ]
Xie, Zhaobin [1 ,4 ]
机构：
[1] Hunan Univ, Coll Civil Engn, Changsha 410082, Hunan, Peoples R China
[2] WOWA Int Engn & Consulting Co Ltd, Guangzhou, Guangdong, Peoples R China
[3] Hong Kong Polytech Univ, Dept Civil & Environm Engn, Kowloon, Hong Kong, Peoples R China
[4] Cent South Univ Forestry & Technol, Coll Civil Engn & Mech, Changsha 410018, Hunan, Peoples R China
来源：
CONSTRUCTION AND BUILDING MATERIALS | 2015年 / 98卷
基金：
中国博士后科学基金;
关键词：
Recycled concrete aggregate; Carbonation treatment; Mortar; Shrinkage; Chloride migration coefficient; Microstructure; DRYING SHRINKAGE; COMPRESSIVE STRENGTH; SURFACE;
D O I：
10.1016/j.conbuildmat.2015.08.087
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
This work investigated the effect of carbon dioxide treatment of recycled concrete aggregate (RCA) on the performance of RCA and RCA mortar. The results indicated that carbonation increased the apparent density, and reduced both water absorption and the crushing value of the RCA. The flowability and compressive strength of the RCA mortar were lower than those of natural sand mortar. However, the properties of mortar made with carbon dioxide treated RCA were very similar to those of natural sand mortar. Compared with the mortar made of un-carbonated RCA, the mortar made with carbonated RCA showed increased autogenous shrinkage, reduced drying shrinkage, water absorption, and chloride migration coefficient. Scanning electron microscope (SEM) examination on the interfacial transition zone (ITZ) in the RCA and RCA mortar found that carbonation treatment of RCA not only improved the original ITZ in the RCA, but also improved the newly formed ITZ in the RCA mortar. (C) 2015 Elsevier Ltd. All rights reserved.
引用
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页码：1 / 7
页数：7
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