한국건축시공학회지 (Journal of the Korea Institute of Building Construction)

  • 제10권4호
  • /
  • Pages.3-9
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  • 2010
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  • 1598-2033(pISSN)
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  • 2233-5706(eISSN)
한국건축시공학회 (The Korean Institute of Building Construction)
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복합섬유(PP, NY)를 혼입한 60, 80MPa 3성분계 고강도콘크리트의 내화특성

Spalling Properties of 60, 80MPa High Strength Concrete with Fiber

  • Kim, Seong-Deok (Construction Technology Reserch Dept., Land & Housing Institute) ;
  • Kim, Sang-Yun (Construction Technology Reserch Dept., Land & Housing Institute) ;
  • Bae, Ki-Sun (Construction Technology Reserch Dept., Land & Housing Institute) ;
  • Park, Su-Hee (Construction Technology Reserch Dept., Land & Housing Institute) ;
  • Lee, Bum-Sik (Construction Technology Reserch Dept., Land & Housing Institute)
  • 투고 : 2010.02.08
  • 심사 : 2010.05.05
  • 발행 : 2010.08.20
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초록

본 연구는 고강도콘크리트의 내화성능 증진에 효과적인 것으로 알려진 섬유(PP+NY) 혼입율 변화에 따른 60 MPa, 80 MPa 3성분계 고강도콘크리트의 유동성 및 강도특성을 검토하고 내화시험을 통해 폭렬현상을 확인하였다. 섬유(PP+NY) 혼입율을 0%, 0.05%, 0.1%, 0.2%로 산정하여 실험한 결과, 유동성 및 강도가 미세하지만 저하하는 것으로 나타났으나, 전반적으로 목표 범위를 만족하는 것으로 나타났다. 3시간 내화 후 폭렬특성으로 0%에서는 폭렬현상이 나타났지만, 0.05%이상에서는 표면에 미세한 균열만 발생하고 피복 탈락현상은 나타나지 않는 것으로 나타났다. 또한 폭렬이 발생되지 않은 공시체의 경우 잔존압축강도율이 5 ~ 6%로 나타났다. 이상 적은 양의 섬유(PP+NY)혼입율인 0.05%이상에서 폭렬현상이 방지되어 가장 양호한 것으로 판단된다.

Fire resistance and material properties of high-strength concrete (W/B 21.5%, 28.5%) with OPC, BS and FA were tested in this study. Main factors of the test consisted of fiber mixing ratio and W/B. Two types of fiber (NY, PP) mixed with the same weight were used for the test. The fiber mixing ratios were 0%, 0.05%, 0.1%, and 0.2% of the concrete weight. After performing the test, Under the W/B level of 21.5% and 28.5%, the spalling was effectively resisted by using the high strength concrete with fiber mixing ratios of 0.05%~0.1%. Compressive strength, flowability and air content are similar those of the fiberless high-strength concrete with the same W/B.

키워드

참고문헌

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