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http://dx.doi.org/10.18770/KEPCO.2021.07.02.295

Crack-healing and durability performance of self-healing concrete with microbial admixture  

Chu, Inyeop (KEPCO Research Institute, Korea Electric Power Corporation)
Woo, Sang-Kyun (KEPCO Research Institute, Korea Electric Power Corporation)
Lee, Byung-Jae (KEPCO Research Institute, Korea Electric Power Corporation)
Lee, Yun (KEPCO Research Institute, Korea Electric Power Corporation)
Lee, Hyo-Sub (KEPCO Research Institute, Korea Electric Power Corporation)
Publication Information
KEPCO Journal on Electric Power and Energy / v.7, no.2, 2021 , pp. 295-299 More about this Journal
Abstract
Recently, interest in maintenance has been increasing due to the enlargement and aging of infra structures. Therefore, a new paradigm is required to secure and improve the durability of structures differentiated from the past. Accordingly, research on smart concrete incorporating the concept of self-healing into concrete is being actively conducted. In this study, the crack healing performance and durability performance of self-healing concrete applied with a hydrogel containing biomineral-forming microorganisms were evaluated. As a result of evaluating the dispersion of the hydrogel in concrete, it was confirmed that the hydrogel was well distributed in concrete matrix with a dispersion coefficient of 0.35 to 0.46. The crack healing performance evaluation was verified by a water permeability test, and showed a recovery rate of 95% or more at the age of 28 days, confirming the applicability of self-healing concrete. The durability performance of self-healing concrete was evaluated in terms of resistance to penetration of chloride ion and freezing and thawing. Regardless of the mixing of the hydrogel, the same level of durability performance was shown for various compressive strength level. Therefore, it was confirmed that the microbial admixture did not affect concrete durability. In the future, long-term crack healing performance and durability verification studies should be supplemented.
Keywords
Crack-Healing; Self-Healing Concrete; Durability; Dispersion;
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