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Fire resistance assessment of high strength segment concrete depending on PET fiber amount under fire curves

화재곡선과 PET섬유 혼입량에 따른 고강도 세그먼트 콘크리트의 화재저항성 평가에 대한 연구

  • Choi, Soon-Wook (Geotechnical Engineering Research Division, Korea Institute of Construction Technology) ;
  • Lee, Gyu-Phil (Geotechnical Engineering Research Division, Korea Institute of Construction Technology) ;
  • Chang, Soo-Ho (Geotechnical Engineering Research Division, Korea Institute of Construction Technology) ;
  • Park, Young-Taek (Geotechnical Engineering Research Division, Korea Institute of Construction Technology) ;
  • Bae, Gyu-Jin (Geotechnical Engineering Research Division, Korea Institute of Construction Technology)
  • 최순욱 (한국건설기술연구원 SOC성능연구소 Geo-인프라연구실) ;
  • 이규필 (한국건설기술연구원 SOC성능연구소 Geo-인프라연구실) ;
  • 장수호 (한국건설기술연구원 SOC성능연구소 Geo-인프라연구실) ;
  • 박영택 (한국건설기술연구원 SOC성능연구소 Geo-인프라연구실) ;
  • 배규진 (한국건설기술연구원 SOC성능연구소 Geo-인프라연구실)
  • Received : 2014.05.07
  • Accepted : 2014.05.21
  • Published : 2014.05.31

Abstract

High strength concrete is not only vulnerable to the occurrence of spalling which generates the loss of cross-section in concrete structures but produces faster degradation in its mechanical properties than normal strength concrete in the event of fire. This study aims to evaluate fire resistance of high strength segment concrete with PET fibers mixed to prevent spalling under ISO834 (2hr) and RABT fire curve. As results, the samples without PET fibers show the concrete loss up to the depth of about 8 cm and 9.5 cm from the surface exposed to fire under ISO834 and RABT fire curve respectively. The samples mixed with PET fiber of 0.1% show no spalling under ISO834 fire curve and the spalled thickness of 6.5 cm under RABT fire curve after the fire tests. Finally, the sample mixed with PET fiber of 0.2% shows no spalling under RABT fire curve. The results indicate that the suitable amounts of PET fiber for securing fire resistance performance of this high strength segment concrete are 0.1% under ISO834 fire curve and 0.2% under RABT fire curve. However, even though spalling does not occur, it is necessary to repair the deterioration of concrete up to 4 cm from the surface exposed to fire after fire.

Acknowledgement

Grant : 고성능 세그먼트 라이닝의 개발

Supported by : 한국건설교통기술평가원

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