Engineering application of microbial self-healing concrete in lock channel wall

Abstract

In this paper, the engineering application of microbial self-healing concrete in ship lock engineering was studied. Researches including the design and batch preparation of microbial self-healing agent, and laboratory tests of microbial self-healing concrete were carried out. A class of self-healing agents containing microbial spores and calcium sources was designed and batch-produced by spray drying method, which was tested to show that the addition of self-healing agent in concrete has no significant effect on the performance of the concrete mixture and the development of the compressive strength of hardened concrete specimens. Then the self-healing agents were applied to the production of commercial concrete, and a corresponding microbial concrete production system was formulated. After applying the produced microbial self-healing concrete to the side wall of the ship lock, it was observed that the cracking of the concrete was completely healed after 60 days, and the leakage of the crack was effectively blocked. Thus microbial self-healing concrete is expected to be widely used in concrete crack self-healing in hydraulic environment.