KEPCO Journal on Electric Power and Energy

Korea Electric Power Corporation (한국전력공사)
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Crack-healing and durability performance of self-healing concrete with microbial admixture

미생물 혼입 자기치유 콘크리트의 균열 치유성능 및 내구성능

  • 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)
  • Received : 2020.11.17
  • Accepted : 2021.09.27
  • Published : 2021.12.30
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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

Acknowledgement

본 연구는 한국전력공사의 주력연구개발과제로 수행한 "전력구조물의 장수명화를 위한 Self Healing Concrete 개발"(R16SA04)과제의 연구비에 의해 지원되었음

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