한국건설순환자원학회논문집 (Journal of the Korean Recycled Construction Resources Institute)

한국건설순환자원학회 (Korean Recycled Construction Resources Institute)
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광합성 남세균을 도포한 투수 콘크리트의 이산화탄소 고정에 의한 물성 변화

Physical Properties of Photosynthetic Cyanobacteria Applied Porous Concrete by CO2 Sequestration

  • 장인동 (한국건설기술연구원 구조연구본부) ;
  • 이남곤 (한국건설기술연구원 구조연구본부) ;
  • 박정준 (한국건설기술연구원 구조연구본부) ;
  • 곽종원 (한국건설기술연구원 구조연구본부) ;
  • 문훈 (한국건설기술연구원 구조연구본부)
  • Indong Jang (Department of Structural Engineering Research, Korea Institute of Civil Engineering and Building Technology) ;
  • Namkon Lee (Department of Structural Engineering Research, Korea Institute of Civil Engineering and Building Technology) ;
  • Jung-Jun Park (Department of Structural Engineering Research, Korea Institute of Civil Engineering and Building Technology) ;
  • Jong-Won Kwark (Department of Structural Engineering Research, Korea Institute of Civil Engineering and Building Technology) ;
  • Hoon Moon (Department of Structural Engineering Research, Korea Institute of Civil Engineering and Building Technology)
  • 투고 : 2023.11.03
  • 심사 : 2023.11.21
  • 발행 : 2023.12.30
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초록

콘크리트는 전 생애주기에서 막대한 양의 이산화탄소를 배출하며, 이산화탄소 감축을 위한 사회적인 요구에 따라 콘크리트에 이산화탄소를 광물형태로 저장하려는 연구가 지속되고 있다. 본 연구에서는 광합성을 통해 이산화탄소를 흡수하여 탄산칼슘으로 고정하는 남세균(Cyanobacteria)을 다공성 콘크리트 기질에 도포하였으며, 이의 특수 환경 양생에 따른 콘크리트 기질의 특성 변화를 분석하였다. 실험 결과 미생물에 의한 탄산칼슘 석출은 빛이 닿는 표면부에서 집중되어 있는 것을 확인하였으며, 대부분의 석출이 골재가 아닌 페이스트 부분에서 발생하였다. 이러한 미생물에 의한 탄산칼슘 석출은 페이스트의 역학성능을 강화하였으며, 양생 재령의 경과에 따라 전체 압축강도가 향상되는 효과를 보였다. 또한 미생물 막과 탄산칼슘의 증가로 공극구조가 개선되어 투수량 감소에도 영향을 끼쳤다.

Concrete emits a large amount of carbon dioxide throughout its life cycle, and due to the societal demand for carbon dioxide reduction, research on storing carbon dioxide in concrete in the form of minerals is ongoing. In this study, cyanobacteria, which absorb carbon dioxide through photosynthesis and fix it as calcium carbonate, were applied to a porous concrete substrate, and the changes in the properties of the concrete substrate due to their special environmental curing condition were analyzed. The results showed that the calcium carbonate precipitation by the microorganisms was concentrated in the light-exposed surface area, and most of the precipitation occurred in the cement paste part, not in the aggregate. This microbially induced calcium carbonate precipitation enhanced the mechanical performance of the paste and improved the overall compressive strength as the curing age progressed. In addition, the increase in microbial biofilm and calcium carbonate improved the pore structure, which influenced the reduction in water permeability.

키워드

과제정보

이 연구는 한국건설기술연구원 주요사업 ｢친환경 Carbon Eating Concrete(CEC) 제조 및 활용 기술 개발｣의 연구비 지원에 의해 수행되었습니다(No. 2023-0108).

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