Journal of the Korea Concrete Institute (콘크리트학회논문집)

Korea Concrete Institute (한국콘크리트학회)
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Effect of Recycled Coarse Aggregate on Compressive Strength and Mechanical Properties of Concrete

순환굵은골재가 콘크리트의 압축강도 및 역학적 특성에 미치는 영향

  • Yang, In-Hwan (Dept. of Civil Engineering, Kunsan National University) ;
  • Jeong, Joon-Young (Research Institute for Engineering & Technology, Chung Cheong University)
  • 양인환 (군산대학교 토목공학과) ;
  • 정준영 (충청대학교 공학기술연구원)
  • Received : 2015.10.26
  • Accepted : 2016.01.22
  • Published : 2016.02.29
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Abstract

Most studies on mechanical properties of concrete with recycled aggregate was focused on the concrete with compressive strength of less than 40 MPa. Therefore, this paper concerns the compressive strength and mechanical properties of concrete with compressive strength of greater than 40 MPa containing recycled coarse aggregate (RCA). The experimental parameters were compressive strength level and replacement ratio of RCA. Compressive strength level was 45 and 60 MPa, and replacement ratio of RCA was 30, 50, 70 and 100%. The results of the test were discussed: compressive strength, elastic modulus, split tensile strength and modulus of rupture. Test results of elastic modulus were compared to the design code predictions. The design code predictions for elastic modulus overestimated the experimental results. However, the design code predictions for modulus of rupture were generally in agreement with the measured values.

순환골재를 사용한 콘크리트의 재료 및 역학 특성에 관한 대부분의 연구는 압축강도 40 MPa 이하의 콘크리트에 대하여 수행되었으며, 40 MPa 이상의 순환골재 콘크리트에 대한 역학적 특성에 대한 연구결과는 미비하다. 따라서, 이 연구에서는 순환골재 사용의 확대를 위해 40 MPa 이상의 순환골재 콘크리트의 압축강도 및 역학 특성을 파악하였다. 순환골재 콘크리트의 역학 특성을 파악하기 위하여 콘크리트 압축강도 및 순환굵은골재 치환율을 실험변수로 고려하였다. 실험변수로서 콘크리트의 압축강도는 45 및 60 MPa이고, 순환골재 치환율은 30, 50, 70 및 100%이다. 실험변수에 따른 순환골재 콘크리트의 압축강도, 탄성계수, 인장강도 및 파괴계수 특성을 분석하였다. 실험결과는 고강도 콘크리트일수록 순환골재 치환율에 따른 압축강도 감소량이 작은 것을 나타낸다. 탄성계수 실험결과와 기존설계코드에 의한 탄성계수 예측결과를 비교하였으며, 설계코드에 의한 예측결과는 실험결과를 과다평가하고 있다. 반면에 설계코드에 의한 파괴계수 예측결과와 실험결과는 잘 일치한다.

Keywords

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