Surface treatment of recycled concrete aggregates through microbial carbonate precipitation

被引：215
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
相关论文
共 37 条
  • [1] [Anonymous], 2009, SINGAPORES SAND SHOR
  • [2] De Belie N, 2009, CRACK REPAIR CONCRET
  • [3] Bacterial carbonate precipitation improves the durability of cementitious materials
    De Muynck, Willem
    Debrouwer, Dieter
    De Belie, Nele
    Verstraete, Willy
    [J]. CEMENT AND CONCRETE RESEARCH, 2008, 38 (07) : 1005 - 1014
  • [4] Bacterial carbonate precipitation as an alternative surface treatment for concrete
    De Muynck, Willem
    Cox, Kathelijn
    De Belle, Nele
    Verstraete, Willy
    [J]. CONSTRUCTION AND BUILDING MATERIALS, 2008, 22 (05) : 875 - 885
  • [5] Influence of temperature on the effectiveness of a biogenic carbonate surface treatment for limestone conservation
    De Muynck, Willem
    Verbeken, Kim
    De Belie, Nele
    Verstraete, Willy
    [J]. APPLIED MICROBIOLOGY AND BIOTECHNOLOGY, 2013, 97 (03) : 1335 - 1347
  • [6] Microbial carbonate precipitation in construction materials: A review
    De Muynck, Willem
    De Belie, Nele
    Verstraete, Willy
    [J]. ECOLOGICAL ENGINEERING, 2010, 36 (02) : 118 - 136
  • [7] Influence of urea and calcium dosage on the effectiveness of bacterially induced carbonate precipitation on limestone
    De Muynck, Willem
    Verbeken, Kim
    De Belie, Nele
    Verstraete, Willy
    [J]. ECOLOGICAL ENGINEERING, 2010, 36 (02) : 99 - 111
  • [8] Bio-deposition of a calcium carbonate layer on degraded limestone by Bacillus species
    Dick, Jan
    De Windt, Wim
    De Graef, Bernard
    Saveyn, Hans
    Van der Meeren, Paul
    De Belie, Nele
    Verstraete, Willy
    [J]. BIODEGRADATION, 2006, 17 (04) : 357 - 367
  • [9] Modification of recycled concrete aggregate by calcium carbonate biodeposition
    Grabiec, Anna M.
    Klama, Justyna
    Zawal, Daniel
    Krupa, Dana
    [J]. CONSTRUCTION AND BUILDING MATERIALS, 2012, 34 : 145 - 150
  • [10] Key roles of pH and calcium metabolism in microbial carbonate precipitation
    Hammes F.
    Verstraete W.
    [J]. Reviews in Environmental Science and Biotechnology, 2002, 1 (1) : 3 - 7
1234