Journal of the Architectural Institute of Korea Structure & Construction (대한건축학회논문집:구조계)

Architectural Institute of Korea (대한건축학회)
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A Study on the Mechanical Properties of Concrete Using Recycled Coarse Aggregates at High Temperatures

고온을 받는 순환굵은골재 콘크리트의 역학적 특성에 관한 연구

  • 신우철 (금오공과대학교 건축학부) ;
  • 이호경 (금오공과대학교 건축학부) ;
  • 백승민 (금오공과대학교 건축학부) ;
  • 김우석 (금오공과대학교 건축학부) ;
  • 권우현 ((주)케이엔지니어링) ;
  • 곽윤근 (금오공과대학교 건축학부)
  • Received : 2015.04.01
  • Accepted : 2015.07.08
  • Published : 2015.07.30
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Abstract

The main purpose of this study is to investigate on residual mechanical performance of recycled coarse aggregate concrete (RCAC), after being subjected to high temperatures. In this experiment, a control concrete mix made with natural coarse aggregates and two concrete mixes with RCA replacement ratio of 15% and 30% were designed. Specimens were exposed for a period of $1^{\circ}C/min$ to temperatures of $20^{\circ}C$, $200^{\circ}C$, $400^{\circ}C$, $600^{\circ}C$ and $800^{\circ}C$. After cooling down to ambient temperature, the following basic mechanical properties were then evaluated and compared with reference values obtained prior to thermal exposure: (i) Residual compressive strength; (ii) Residual splitting tensile strength; (iii) Residual flexural strength; (iv) Elastic modulus; (v) SEM analysis & XRD analysis. In addition, XRD and SEM Images analyses were performed to investigate chemical and physical characteristics of RCAC.

Keywords

Acknowledgement

Supported by : 금오공과대학교

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