Journal of Jilin University(Engineering and Technology Edition) ›› 2020, Vol. 50 ›› Issue (2): 641-647.doi: 10.13229/j.cnki.jdxbgxb20181001

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Repair and rejuvenation of cracked concrete by microbiologically⁃induced calcite⁃precipitation

Jie YUAN1(),Xin CHEN1,2(),Hong-lin HE1,Bo YANG1,Xiao-jun ZHU2,3   

  1. 1.School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin 150090, China
    2.State Key Laboratory of Safety and Health for In?service Long Span Bridges, JSTI Group, Nanjing 210019, China
    3.College of Civil Engineering and Transportation Engineering, Hohai University, Nanjing 210098, China
  • Received:2018-09-29 Online:2020-03-01 Published:2020-03-08
  • Contact: Xin CHEN E-mail:hityuanj@163.com;xin.chen@alu.hit.edu.cn

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Abstract:

The research was conducted to comprehensively study the efficiency and effectiveness of bacteria-based concrete repair technology. In the research, Sporosarcina pasteurii were applied as working bacteria in healing agent, the calcium source was selected by analysis of product crystalline phases. The prepared healing agent was used to repair cracked concrete specimens. After repair computed tomography was applied to evaluate the physical sealing. Specimens with and without cracking and specimens with crack-sealing were processed, and a series of durability tests were conducted to study the sealing caused rejuvenation, including water absorption, chloride penetration resistance, frost resistance and sulfate attack resistance. Results show that calcium nitrate is suitable as calcium source, which reacts with hydrolysed urea to entirely seal the crack surface and can fill more than half of the crack space. The impermeability of the cracked concrete is greatly rejuvenated after repair, and both frost resistance and sulfate attack resistance are compensated in certain scale. This research has recommended calcium nitrate as calcium source for bacteria-based mineralization, evaluated sealing efficiency, and importantly, confirmed a good rejuvenation in concrete durability.

Key words: building materials, concrete, repair, microorganism, durability

CLC Number: 

  • TU57+8

Fig.1

Surface preparation of specimens"

Fig.2

Crystalline phase analysis of products"

Fig.3

CT images of specimen before and after repair"

Fig.4

Spaces of layers before and after repair"

Fig.5

48 h water absorption rate"

Fig.6

Performance of crack during freeze-thaw cycles"

Fig.7

Mass loss rate during freeze-thaw cycles"

Fig.8

Compressive strength variation in freeze-thaw cycles"

Fig.9

Performance of crack under sulfate attack"

Fig.10

Mass loss rate under sulfate attack"

Fig.11

Compressive strength variation under sulfate attack"

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