Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Quality Enhancement of Recycled Concrete Aggregates for Backfill Materials by CO2 Carbonation: Development of a 5-kg-scale Prototype Reactor

이산화탄소의 탄산화 반응을 이용한 되메움재용 순환골재의 품질 개량: 5kg급 프로토타입 반응조 개발

  • Kim, Jinwoo (Dept. of Civil and Environmental Engrg., Korea Advanced Institute of Science and Technology [KAIST]) ;
  • Jeon, Min-Kyung (CO2 Geological Storage Research Center, Korea Institute of Geoscience and Mineral Resources [KIGAM]) ;
  • Kwon, Tae-Hyuk (Dept. of Civil and Environmental Engrg., Korea Advanced Institute of Science and Technology [KAIST]) ;
  • Kim, Nam-Ryong (Water Infrastructure Research Center, K-water Research Institute)
  • 김진우 (한국과학기술원 건설및환경공학과) ;
  • 전민경 (한국지질자원연구원 CO2지중저장센터) ;
  • 권태혁 (한국과학기술원 건설및환경공학과) ;
  • 김남룡 (K-water연구원 물인프라안전연구소)
  • Received : 2024.01.09
  • Accepted : 2024.02.06
  • Published : 2024.02.29
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Abstract

In this study, recycled concrete aggregates (RCA) were treated in a 5-kg-scale prototype reactor with carbon dioxide (CO2) to enhance their material quality and geotechnical performance. The aggregate crushing value (ACV) and California bearing ratio (CBR) were measured on untreated RCAs and CO2-treated RCAs. After CO2 treatment, the ACV decreased from 35.6% to 33.2%, and the CBR increased from 97.5% to 102.4%. The CO2 treatment caused a reduction of fine particle generation and an increase in bearing capacity through carbonation. When CO2 treatment was performed with mechanical agitation, which provided additional enhancement in mechanical quality, the ACV was reduced further to 30.3%, and the CBR increased to 137.7%. If upscaled effectively, the proposed CO2 treatment technique would be an effective method to reduce carbon emissions in construction industries.

본 연구에서는 이산화탄소 처리를 통한 순환골재의 지반공학적 성능 개량을 평가하기 위하여 5kg급 프로토타입 반응조를 제작하였다. 제작된 반응조를 이용하여 이산화탄소 처리한 순환골재와 미처리 순환골재의 골재 파쇄값과 노상토지지력비를 측정하였다. 이산화탄소 처리를 통해 골재 파쇄값은 35.6%에서 33.2%로 2.4% 감소하고 노상토지 지력비는 97.5%에서 102.4%로 4.9% 증가하는 것이 관찰되었다. 탄산화 반응을 통해 생성된 탄산칼슘 염으로 인해 순환골재의 세립분 생성이 감소하고 지지력이 증가함을 알 수 있었다. 또한 교반을 함께할 경우 추가적인 역학적 개량 효과를 통해 골재 파쇄값이 30.3%로 감소하고 노상토지지력비는 137.7%로 증가하였다. 본 연구에서 기술된 이산화탄소 처리 기술의 현장 적용 시 건설 산업의 탄소배출을 효과적으로 줄일 수 있을 것으로 보인다.

Keywords

Acknowledgement

본 연구는 한국전력공사의 기초연구과제(R22XO05-11)에 의해 수행된 연구로, 이에 깊은 감사를 드립니다.

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