Surface treatment of recycled concrete aggregates through microbial carbonate precipitation

被引：230
作者：
Qiu, Jishen [1 ]
Tng, David Qin Sheng [1 ]
Yang, En-Hua [1 ]
机构：
[1] Nanyang Technol Univ, Sch Civil & Environm Engn, Singapore 639798, Singapore
来源：
CONSTRUCTION AND BUILDING MATERIALS | 2014年 / 57卷
关键词：
Recycled concrete aggregates; RCA; Surface treatment; Microbial carbonate precipitation; MCP; CALCITE PRECIPITATION; COMPRESSIVE STRENGTH; CONSERVATION;
D O I：
10.1016/j.conbuildmat.2014.01.085
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
Reuse of recycled concrete aggregates (RCA) in new concrete structures is limited due to their high water absorption and weak bonding to new matrix. These unfavorable properties are associated with the thin layer of old mortar attached to the surface of original aggregates. In this paper, a novel approach of RCA surface treatment by means of microbial carbonate precipitation (MCP) was studied. Factors influencing MCP on RCA were investigated. It was found that the amount of MCP peaks at pH = 9.5 and increases with higher temperature, bacteria concentration, or calcium concentration. Enhanced MCP on RCA can be achieved through proper control of culturing and precipitating conditions. Results show that surface modification of RCA through MCP is feasible evidenced by increasing weight and reducing water absorption of treated RCA. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码：144 / 150
页数：7
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