Journal of the Korean Recycled Construction Resources Institute (한국건설순환자원학회논문집)

Korean Recycled Construction Resources Institute (한국건설순환자원학회)
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Review of Changes in Mechanical Properties of Concrete According to Recycled Coarse Aggregate Replacement Rate_Case Study

순환 굵은 골재 치환율에 따른 콘크리트의 역학적 특성 변화 검토_사례 연구

  • Young-Jin Nam (Department of Fire and Disaster, Semyung University) ;
  • Tae-Hyung Kim (Department of Fire and Disaster, Semyung University) ;
  • Won-Chang Kim (Department of Fire and Disaster, Semyung University) ;
  • Tae-Gyu Lee (Department of Fire and Disaster, Semyung University)
  • 남영진 (세명대학교 소방방재공학과) ;
  • 김태형 (세명대학교 소방방재공학과) ;
  • 김원창 (세명대학교 소방방재공학과) ;
  • 이태규 (세명대학교 소방방재학과)
  • Received : 2024.05.15
  • Accepted : 2024.06.19
  • Published : 2024.06.30
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Abstract

In this study, it was determined that it was necessary to consider the replacement rate when applying recycled coarse aggregate to concrete, so data on existing research trends and results were collected and the mechanical properties of concrete according to the replacement rate of recycled coarse aggregate were analyzed. In collecting data on recycled coarse aggregate, data without processes such as compressive strength and removal of residual mortar attached to recycled coarse aggregate were collected among the concrete measurement items. In the case of concrete with 50 % and 100 % replacement of recycled coarse aggregate, it was confirmed that the mechanical properties were lower or higher than ordinary concrete by -36.0 ~ 9.9 % and -40.0 ~ 10.4 %, respectively, on average. Accordingly, it is judged that additional water should be mixed in consideration of the absorption rate when mixing, and the replacement rate of recycled coarse aggregate, which has mechanical properties of 80 % or more compared to ordinary concrete, should be less than 50 %.

본 연구에서 순환 굵은 골재를 콘크리트에 적용하는 데 있어 치환율을 고려할 필요가 있다고 판단되어 기존 연구 동향 및 결과에 대한 자료를 수집하고 순환 굵은 골재 치환율에 따른 콘크리트의 역학적 특성을 분석하였다. 순환 굵은 골재에 대한 자료를 수집하는 데 있어 콘크리트 측정항목 중 압축강도의 있는 것과 및 순환 굵은 골재에 부착된 잔여 모르타르의 제거 등의 공정을 거치지 않은 자료를 수집하였다. 순환 굵은 골재를 50 %와 100 % 치환한 콘크리트의 경우 보통 콘크리트 대비 역학적 특성이 평균적으로 각각 -36.0 ~ 9.9 %와 -40.0 ~ 10.4 % 밑돌거나 상회하는 것을 확인할 수 있었다. 이에 따라 배합 시 흡수율을 고려하여 추가적인 물을 혼입해야 하며, 보통 콘크리트 대비 80 % 이상의 역학적 특성이 나오는 순환 굵은 골재 치환율을 50 % 이하로 하여야 한다고 판단된다.

Keywords

Acknowledgement

This study was supported by the Technology development Program (S3270705) funded by the Ministry of SMEs and Startups (MSS, Korea) & the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2022R1F1A1073333).

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