Effect and Mechanism of Encapsulation-Based Spores on Self-Healing Concrete at Different Curing Ages

ACS Applied Materials & Interfaces
Tianwen ZhengChunxiang Qian

Abstract

It has become an intelligent and environmental protection method to repair concrete cracks based on microbial-induced calcium carbonate precipitation (MICP). However, due to the high-alkali environment in concrete, even the microbial spores with strong alkali resistance find it difficult to survive for a long time, which affects the long-term self-healing effect of concrete cracks. In this paper, low-alkali sulfo-aluminate cement (SC) was used as a carrier to encapsulate spores, and the effects of the spore group and microbial group on the basic performances of concrete were studied. Then, the area repair ratio, water permeability, the repair ratio of anti-chloride ion penetration, and ultrasonic velocity were used to evaluate the self-healing efficiency of cracks, and the self-healing effects of two kinds of microbial self-healing agents on concrete cracks with different curing ages were further studied. Moreover, the growth, enzyme activity, and microbial morphologies of spores with and without encapsulation immersed in the simulated pore solution of cement-based materials at different times were studied to discuss the protective effect of the carrier on spores. Compared with the reference group, the results showed that the a...Continue Reading

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Feb 28, 2020·The Journal of Microbiology·Youngung RyuWoojun Park

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Citations

Jun 5, 2021·Materials Science & Engineering. C, Materials for Biological Applications·Chunxiang QianHaihe Yi

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