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标题:Surface treatment of recycled concrete aggregates through microbial carbonate precipitation
时间:2020-02-14 23:31:26
DOI:10.1016/j.conbuildmat.2014.01.085
作者:Qiu, Jishen; Tng, David Qin Sheng; Yang, En-Hua
关键词:Recycled concrete aggregates; RCA; Surface treatment; Microbial carbonate precipitation; MCP
出版源: 《Construction & Building Materials》 ,57 :144-150
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.
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目录:
  • Surface treatment of recycled concrete aggregates through microbial carbonate precipitation
    • 1 Introduction
    • 2 Experimental program
      • 2.1 Recycled concrete aggregates
      • 2.2 Bacteria and culture media
      • 2.3 Test of microbial carbonate precipitation
      • 2.4 Test of microbial carbonate precipitation on RCA
      • 2.5 Microstructure analysis
    • 3 Results and discussion
      • 3.1 Effects of pH and temperature on microbial carbonate precipitation
      • 3.2 Effects of bacteria concentration and calcium content on MCP on RCA
      • 3.3 Enhanced MCP on RCA
      • 3.4 Microstructure analysis
    • 4 Conclusions
    • References

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