Efficiency of concrete crack-healing based on biological carbonate precipitation

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• 作者：Mian Luo ; Chunxiang Qian ; Ruiyang Li…
• 关键词：crack ; healing capacity ; concrete ; bacteria ; self ; healing agent ; water permeability
• 刊名：Journal of Wuhan University of Technology--Materials Science Edition
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：30
• 期：6
• 页码：1255-1259
• 全文大小：1,371 KB
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• 作者单位：Mian Luo (1) (2)
  Chunxiang Qian (1) (2)
  Ruiyang Li (1) (2)
  Hui Rong (1) (2)
  
  1. College of Materials Science and Engineering, Southeast University, Nanjing, 211189, China
  2. Research Institute of Green Construction Materials, Southeast University, Nanjing, 211189, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Materials Science
  Chinese Library of Science
  
• 出版者：Wuhan University, co-published with Springer
• ISSN：1993-0437

文摘

The aim of this study was to improve the capacity for crack-repair in concrete by developing a new way. The self-healing agent based on biological carbonate precipitation was developed. Crack-healing capacity of the cement paste specimens with this biochemical agent was researched. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) were used to characterize the precipitation in cracks. The healing efficiency was evaluated by measuring the water permeability after crack healing as well.The experimental results show that the applied biochemical agent can successfully improve the self-healing capacity of the cement paste specimens as larger cracks can be healed. The cracks with a width of 0.48 mm in the specimens with the biochemical agent are nearly fully healed by the precipitation after 80d repair. SEM and XRD analysis results demonstrate that the white precipitation in cracks is calcium carbonate, which displays spherical crystal morphology. Meanwhile, the water permeability test result shows that the biochemical agent can significantly decrease the water permeability of the cement paste specimens, the water permeability of specimens with the biochemical agent respectively decreases by 84% and 96% after 7 d and 28 d immersion in water, however the control specimens only respectively decrease by 41% and 60%, which indicates that the bacteria-based concrete appears to be a promising approach to increase concrete durability. Key words crack-healing capacity concrete bacteria self-healing agent water permeability