콘크리트학회논문집 (Journal of the Korea Concrete Institute)

  • 제23권3호
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  • Pages.321-330
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  • 2011
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  • 1229-5515(pISSN)
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  • 2234-2842(eISSN)
한국콘크리트학회 (Korea Concrete Institute)
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고온 및 하중에 따른 섬유보강 콘크리트의 잔존 역학적 특성에 관한 연구

A Study on the Residual Mechanical Properties of Fiber Reinforced Concrete with High Temperature and Load

  • Kim, Young-Sun (Center for Fire Science and Technology, Tokyo University of Science) ;
  • Lee, Tae-Gyu (Dept. of Architectural Engineering, Chungnam National University) ;
  • Nam, Jeong-Soo (Dept. of Architectural Engineering, Chungnam National University) ;
  • Park, Gyu-Yeon (POSCO Engineering&Construction Co., Ltd.) ;
  • Kim, Gyu-Yong (Dept. of Architectural Engineering, Chungnam National University)
  • 투고 : 2011.01.04
  • 심사 : 2011.02.24
  • 발행 : 2011.06.30
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초록

최근, 고강도 콘크리트의 잔존 역학적 특성에 관한 섬유의 혼입과 고온의 영향은 실험적으로 연구되어지고 있다. 이 논문에서는 고온에 노출된 물시멘트비 55%, 42% 및 35%에 따른 콘크리트의 잔존 역학적 특성을 0.05~0.20 vol.%의 범위로 폴리프로필렌 섬유를 혼입한 콘크리트와 비교하여 평가하였고, 고려된 요인은 섬유 혼입량, 콘크리트 강도 및 재하 하중량이다. 폭렬 발생 시간, 열팽창 변형, 길이 변화 및 중량 감소의 측정과 압축강도, 탄성계수 및 에너지 흡수 능력의 평가를 실시했다. 결과로서는 고온에 노출된 50 MPa급 콘크리트의 폭렬을 방지하기 위해서 0.05 vol.% 이상의 PP섬유가 필요했다. 또한, PP섬유의 단면적은 고온에 노출된 섬유보강 콘크리트의 폭렬 경향과 잔존 역학적 특성에 관해서 영향을 미치는 것으로 나타났다. 특히, 외부 하중은 콘크리트의 잔존 역학적 특성 뿐만 아니라 폭렬의 위험 및 취성적 경향을 증가시켰다.

Recently, the effects of high temperature and fiber content on the residual mechnical properties of high-strength concrete were experimentally investigated. In this paper, residual mechanical properties of concrete with water to cement (w/c) ratios of 0.55, 0.42 and 0.35 exposed to high temperature are compared with those obtained in fiber reinforced concrete with similar characteristics ranging from 0.05% to 0.20% polypropylene (PP) fiber volume percentage. Also, factors including pre-load levels of 20% and 40% of the maximum load at room temperature are considered. Outbreak time, thermal strain, length change, and mass loss were tested to determine compressive strength, modulus of elasticity, and energy absorption capacity. From the results, in order to prevent the explosive spalling of 50 MPa grade concretes exposed to high temperature, more than 0.05 vol. % of PP fibers is needed. Also, the cross-sectional area of PP fiber can influence the residual mechanical properties and spalling tendency of fiber reinforced concrete exposed to high temperature. Especially, the external loading increases not only the residual mechanical properties of concrete but also the risk of spalling and brittle failure tendency.

키워드

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피인용 문헌

  1. State-of-the-Art Research and Experimental Assessment on Fire-Resistance Properties of High Strength Concrete vol.18, pp.3, 2014, https://doi.org/10.11112/jksmi.2014.18.3.028