Journal of the Korean Recycled Construction Resources Institute (한국건설순환자원학회논문집)

Korean Recycled Construction Resources Institute (한국건설순환자원학회)
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Shear Strength of Interface between Natural Aggregate Concrete and Recycled Aggregate Concrete

천연골재 콘크리트와 순환골재 콘크리트 접합면의 전단강도

  • Moon, Hoon (Department of Architectural Engineering, Pukyong National University) ;
  • Choi, Ik-Je (Department of Architectural Engineering, Pukyong National University) ;
  • Kim, Ji-Hyun (Pukyong National University) ;
  • Chung, Chul-Woo (Department of Architectural Engineering, Pukyong National University) ;
  • Kim, Young-Chan (Department of Architectural Engineering, Pukyong National University)
  • 문훈 (부경대학교 건축공학과) ;
  • 최익제 (부경대학교 건축공학과) ;
  • 김지현 (부경대학교 융복합인프라 기술연구소) ;
  • 정철우 (부경대학교 건축공학과) ;
  • 김영찬 (부경대학교 건축공학과)
  • Received : 2019.11.28
  • Accepted : 2020.01.29
  • Published : 2020.03.30
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Abstract

Concrete recycling is becoming mandatory rather selective due to depletion of constructional materials and increase of concrete waste. Studies on recycling concrete are conducted in various point of view for long time. However, standard or guideline of many countries for the application of recycled aggregate concrete(RAC) has restrictions such as low replacement rate of coarse aggregate and no fine aggregate allowed due to inferior material properties of recycled aggregate. This study intends to figure out the feasibility of casting natural aggregate concrete(NAC) and RAC separately in a structural member. In making RAC, replacement rate of coarse aggregate was 50, 100% in RAC and treatment of interface of two concretes is introduced. RAC treatment of recycled aggregate or inclusion of additives was not done as it can increase embodied energy of concrete work. Double-shear test with uniformly distributed loading was adopted to evaluate shear strength at the interface of two concretes. After curing it was hard to distinguish interface of two concretes. Experimental result revealed that specimen with higher replacement rate showed higher shear-to-compressive strength ratio, which is possibly attributed to coarse aggregate size and roughness of sheared section. Further study on the effect of various parameters is required and subsequent research activity is on-going.

건설자원의 고갈과 콘크리트 폐기물의 증가에 따라 콘크리트 재활용은 선택적 사항이라기보다는 필수적 사항으로 되어 가고 있다. 콘크리트 재활용에 대한 연구는 오래 동안 다양한 관점에서 수행되어 왔다. 그러나 여러 나라의 기준이나 권고사항을 보면 순환골재 콘크리트의 적용에는 순환골재의 비율이나 순환잔골재의 사용금지 등과 같은 많은 제한사항이 있다. 본 연구에서는 구조부재에서 천연골재 콘크리트와 순환골재 콘크리트를 분리타설하는 방법에 대한 적절성을 알아보고자 하였다. 순환골재콘크리트의 제작 시 굵은골재의 치환비율은 50, 100%로 하였고 두 콘크리트의 접합면에는 교섭을 도입하였다. 순환골재 콘크리트를 제작하는 과정에서 순환골재를 처리하거나 혼화재를 첨가하지 않았다. 두 콘크리트 접합면의 전단강도를 평가하기 위해 등분포하중으로 재하한 2면전단 시험법을 채택하였다. 실험결과에 따르면 골재치환율이 큰 시험체가 전단강도 대 압축강도 비가 크게 나왔는데 이는 굵은골재의 크기와 전단절단면의 조도에 기인한 것으로 보인다. 여러 가지 변수들의 영향을 알아보기 위한 후속연구가 필요하며 그와 같은 연구 활동을 진행 중이다.

Keywords

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