扩散法用于微生物矿化修复混凝土竖向裂缝的试验研究

doi:10.11896/cldb.21070218

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Abstract In order to investigate the effectiveness of microbially induced carbonate precipitation (MICP) in repairing concrete cracks, concrete specimens with vertical crack width of 0.1 mm, 0.2 mm and 0.4 mm were repaired by MICP with diffusion method and injection method respectively. The effectiveness of repairing cracks was evaluated from the microscopic (composition and morphology of products) and macroscopic (durability and mechanical properties) levels. The results show that the sponge strip used in diffusion method not only store cementation solution, but also provide attachment point for calcium carbonate deposition. The waterproof performance and chloride aggressive resistance of concrete specimens with three crack widths repaired by diffusion method were better than those by injection method, and the average improvement coefficients of these two properties reach 79.7% and 60.9%, respectively. However, the increase of splitting tensile strength was not obvious. The above research results show that the diffusion method was effective to repair the vertical cracks in the unstressed state of the concrete members, which can provide reference for practical engineering.

Key words： concrete crack repair microorganism diffusion method

Published: Online: 2023-07-10

CLC number:

TU375

Fund:National Natural Science Foundation of China (51878319).

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	Articles by authors
	LI Zhongao
	LU Chunhua
	CHENG Liang
	Emmanuel

Cite this article:

LI Zhongao,LU Chunhua,CHENG Liang, et al. Experimental Study on Repairing Vertical Cracks of Concrete by Microbial Mineralization with Diffusion Method[J]. Materials Reports, 2023, 37(13): 21070218-6.

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http://www.mater-rep.com/EN/10.11896/cldb.21070218 OR http://www.mater-rep.com/EN/Y2023/V37/I13/21070218

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