Characteristics of the carbonation resistance of recycled fine aggregate concrete

被引：88
作者：
Geng, Jian [1 ]
Sun, Jiaying [1 ]
机构：
[1] Zhejiang Univ, Ningbo Inst Technol, Res Ctr Green Bldg Mat & Waste Resources Reuse, Ningbo 315100, Zhejiang, Peoples R China
来源：
CONSTRUCTION AND BUILDING MATERIALS | 2013年 / 49卷
关键词：
Recycled fine aggregate; Carbonation; Durability; Fly ash; Microstructure; MORTAR CONTENT; FLY-ASH; DURABILITY; PERFORMANCE;
D O I：
10.1016/j.conbuildmat.2013.08.090
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
This study investigates the effects of the minimum recycled fine aggregate (RFA) particle size, RFA amount, and fly ash addition on the carbonation resistance of RFA concrete (RFAC). The results reveal that the carbonation depth of RFAC increases with decreased minimum RFA particle size and increased RFA amount. At >40% RFA amount, water significantly affects RFAC carbonation. Fly ash addition favors the carbonation resistance of RFAC, especially at 20% cement replacement ratio. In this study, the self-cementing ability of RFA is proved by the microstructural analyses of RFA and RFAC but is found to have a negligible effect on RFAC carbonation for a few carbonizable hydrated products. The poor microstructure of RFAC and the interfacial zone between the new cement paste and RFA result in easier CO2 ingression for RFAC. (C) 2013 Elsevier Ltd. All rights reserved.
引用
收藏
页码：814 / 820
页数：7
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