Journal of the Korean Recycled Construction Resources Institute (한국건설순환자원학회논문집)

Korean Recycled Construction Resources Institute (한국건설순환자원학회)
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Strength and Healing Performance of the Mortar using Bacterial Pellet as a Self-Healing Material

박테리아 펠렛을 자기치유 소재로 사용한 모르타르의 강도 및 치유성능

  • Jang, Indong (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Son, Dasom (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Ryu, Young-ung (Environmental Science & Ecological Engineering, Korea University) ;
  • Park, Woojun (Environmental Science & Ecological Engineering, Korea University) ;
  • Yi, Chongku (School of Civil, Environmental and Architectural Engineering, Korea University)
  • 장인동 (고려대학교 건축사회환경공학부) ;
  • 손다솜 (고려대학교 건축사회환경공학부) ;
  • 류영웅 (고려대학교 환경생태공학부) ;
  • 박우준 (고려대학교 환경생태공학부) ;
  • 이종구 (고려대학교 건축사회환경공학부)
  • Received : 2020.03.02
  • Accepted : 2020.03.25
  • Published : 2020.03.30
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Abstract

In this study, cellulose-based bacterial pellets was used for the self-healing concrete manufacturing. The pellet is composed of complex cultured bacterial spore powder, methyl cellulose, two kinds of PVA nutrients and water, and is extruded through a hydraulic press to have a shape of 2mm in diameter to 3 to 4mm in length. Cellulose pellets expand at neutral pH, release bacteria and nutrients, and do not react in a basic environment, increasing the long-term survival rate of bacteria in cement mortar. In addition, pellet self-healing performance of pellet mortar was significantly higher than that of control mortar. Cellulose-based pellets are a new type of bacterial carrier system that will help develop self-healing concrete in the future by improving and optimizing pellets.

본 연구에서는 메틸 셀룰로오스를 기반으로 제작한 박테리아 펠렛을 모르타르에 혼입하였으며, 펠렛 혼입에 따른 모르타르 내부 생존률과 강도, 정수위 투수실험에 의한 균열 치유율을 조사하였다. 펠렛은 복합 배양한 박테리아 포자 분말과 메틸셀룰로오스, PVA 영양소 2종과 물로 이루어져 있으며, 유압 프레스를 통해 압출되어 지름 2mm~길이 3~4mm의 형상을 갖는다. 셀룰로오스 펠렛은 중성 pH에서 팽창하여 박테리아와 영양소를 방출하고, 염기성 환경에서 반응하지 않는 성질을 띄어 시멘트 모르타르 내부 박테리아의 장기 생존률이 증대하는 효과가 있다. 또한 펠렛 혼입 모르타르는 정수위 투수실험을 통한 균열 자기치유 성능이 대조군 모르타르에 비해 현저히 상승하였다. 셀룰로오스 기반 펠렛은 새로운 종류의 박테리아 담체 시스템으로 추후 펠렛 개량 및 최적화로 자기치유 콘크리트 개발에 도움을 줄 것이다.

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References

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