Experimental study on repair of concrete cracks by microbial action

Abstract

Abstract: Microbial mineralization can effectively heal concrete cracks and therefore achieving the purpose of repairing concrete structures. In this paper, concrete specimens with cracks were taken as the research object. Bacillus pasteurii was used as the healing agent to repair the concrete specimens under different crack conditions, i.e. with width of 0.2 mm, 0.3 mm and 0.6 mm and depth of 20 mm and 30 mm, respectively. Through crack observation, ultrasonic testing, compressive strength testing and microscopic morphology analysis, the repair effects of the selected microorganism on concrete cracks were evaluated. The results show that Bacillus pasteurii can repair the surface cracks of concrete effectively. The supply of oxygen provides the necessary environmental condition for the mineralization of microorganisms inside the cracks. As the depth of the crack increases, the repair effect of Bacillus pasteurii decreases, and as the width increases, the mineralization effect of microorganisms in the cracks is weakened.

Key words: concrete, cracks, microorganism, repair, performance

CLC Number:

TU528.01

CAO Hui, ZANG Yang, FENG Qiong, KANG Kai-wei YE Hu-zi, GOU Bao-xia, LIU Jun-jun. Experimental study on repair of concrete cracks by microbial action[J]. Journal of Lanzhou University of Technology, 2022, 48(4): 126-131.

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