Journal of the Korea Institute of Building Construction (한국건축시공학회지)

The Korean Institute of Building Construction (한국건축시공학회)
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An Experimental Study on the Mechanical Properties of Concrete with High Temperatures and Cooling Conditions

고온 및 냉각조건에 따른 콘크리트의 역학적특성에 관한 실험적 연구

  • Kim, Gyu-Yong (Department of Architectural of Engineering, Chungnam National University) ;
  • Kang, Yeoun-Woo (Department of Architectural of Engineering, Chungnam National University) ;
  • Lee, Tae-Gyu (Department of Architectural of Engineering, Chungnam National University) ;
  • Choe, Gyeong-Cheol (Department of Architectural of Engineering, Chungnam National University) ;
  • Yoon, Min-Ho (Department of Architectural of Engineering, Chungnam National University)
  • Received : 2012.02.02
  • Accepted : 2012.04.20
  • Published : 2012.06.20
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Abstract

Since the 1970s, the mechanical properties of concrete at high temperature, such as compressive strength, elastic modulus, thermal strain, etc. have been investigated. Internal and external factors should be effect to concrete elevated temperature. In particular, the thermal properties of aggregate and cooling conditions are most important to estimate residual mechanical properties. This study evaluates the mechanical properties of concrete with aggregate type and cooling methods. We use normal and light aggregate for different thermal properties, and also test mechanical properties to use ${\O}100{\times}200$ mm cylinder specimen according to target temperature, slow cooling and water cooling. We found that normal aggregate concrete that uses is more highly influenced by cooling conditions than concrete that uses light aggregate concrete. In addition, the residual mechanical properties of concrete increase as cooling velocity lowers.

1970년대부터 고온을 받은 콘크리트의 압축강도, 탄성계수, 열응력 등 콘크리트에 영향을 미칠 수 있는 내적, 외적 인자들의 역학적 특성은 조사되어 왔다. 특히, 골재의 열적 특성이나 냉각 방법은 잔존 역학적 특성을 평가하는데 가장 중요하다. 본 연구에서는, 골재 종류와 냉각 방식에 따른 콘크리트의 역학적 특성에 대해 평가했다. 본 연구에서는 열적특성이 다른 일반 골재와 경량골재를 사용했다. 또한, ${\O}100{\times}200mm$ 원주형 공시체를 사용하여 목표 온도, 서냉 및 급냉조건 후에 역학적 특성을 평가하였다. 결과적으로, 보통 골재를 사용한 콘크리트는 경량골재를 사용한 콘크리트보다 냉각조건이 미치는 영향이 큰 것으로 나타났다. 그리고 냉각 속도가 빠르지 않을수록 콘크리트의 잔존 역학적 특성이 크게 나타났다.

Keywords

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