Self-healing of early age cracks in cement-based materials by mineralization of carbonic anhydrase microorganism.
Self-healing of early age cracks in cement-based materials by mineralization of carbonic anhydrase microorganism.
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DOI：
10.3389/fmicb.2015.01225
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发表时间：
2015
影响因子：
5.2
通讯作者：
Luo M
中科院分区：
文献类型：
--
作者：
Qian C;Chen H;Ren L;Luo M
本研究探讨了在水泥基材料中掺入能产生碳酸酐酶的细菌的早期裂缝的自愈合潜力。分别在7、14、28、60 d龄期对水泥基材料进行预裂，研究裂缝宽度在0.1 ~ 1.0 mm范围内对愈合率的影响。实验结果表明，该菌对7 d早期形成的小裂缝具有良好的修复能力，0.4mm以下的裂缝几乎完全闭合。修补效果随开裂龄期的增加而降低。裂缝宽度对自愈合效果有显著影响。CO2和Ca 2+的运输控制了自修复过程。计算机模拟分析揭示了细菌诱导微生物沉淀的自愈过程和机理，并可根据有效Ca 2+预测沉淀CaCO 3的深度。
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 CO2and 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+.