Self-healing of early age cracks in cement-based materials by mineralization of carbonic anhydrase microorganism

被引：105
作者：
Qian, Chunxiang [1 ,2 ]
Chen, Huaicheng [1 ,2 ]
Ren, Lifu [1 ,2 ]
Luo, Mian [1 ,2 ]
机构：
[1] Southeast Univ, Sch Mat Sci & Engn, Nanjing, Jiangsu, Peoples R China
[2] Southeast Univ, Res Inst Green Construct Mat, Nanjing, Jiangsu, Peoples R China
来源：
FRONTIERS IN MICROBIOLOGY | 2015年 / 6卷
关键词：
cement-based materials; bacteria; early age; self-healing; mechanism; CONCRETE; PRECIPITATION; CALCITE; CARBONATION; BACTERIA; FLOW; CO2;
D O I：
10.3389/fmicb.2015.01225
中图分类号：
Q93 [微生物学];
学科分类号：
071005 ; 100705 ;
摘要：
This research investigated the self healing potential of early age cracks in cement based materials incorporating the bacteria which can produce carbonic anhydrase. Cement-based materials specimens were pre-cracked at the age of 7, 14, 28, 60 days to study the repair ability influenced by cracking time, the width of cracks were between 0.1 and 1.0 mm to study the healing rate influenced by width of cracks. The experimental results indicated that the bacteria showed excellent repairing ability to small cracks formed at early age of 7 days, cracks below 0.4 mm was almost completely closed. The repair effect reduced with the increasing of cracking age. Cracks width influenced self-healing effectiveness significantly. The transportation of CO(2)and Ca2+ controlled the self-healing process. The computer simulation analyses revealed the self-healing process and mechanism of microbiologically precipitation induced by bacteria and the depth of precipitated CaCO3 could be predicted base on valid Ca2+.
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页数：9
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