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Fire resistance assessment of precast fireproof duct slab

프리캐스트 방식 내화풍도슬래브의 화재저항성 평가

  • Choi, Soon-Wook (Underground Space Safety Research Center, Korea Institute of Civil Engineering and Building Technology) ;
  • Kang, Tae-Ho (Underground Space Safety Research Center, Korea Institute of Civil Engineering and Building Technology) ;
  • Lee, Chulho (Underground Space Safety Research Center, Korea Institute of Civil Engineering and Building Technology) ;
  • Kim, Se Kwon (Research Institute, HONG G) ;
  • Kim, Tae Kyun (HONG G) ;
  • Chang, Soo-Ho (Construction Industry Promotion Department, Korea Institute of Civil Engineering and Building Technology)
  • 최순욱 (한국건설기술연구원 지하공간안전연구센터) ;
  • 강태호 (한국건설기술연구원 지하공간안전연구센터) ;
  • 이철호 (한국건설기술연구원 지하공간안전연구센터) ;
  • 김세권 ((주)홍지 기술연구소) ;
  • 김태균 ((주)홍지) ;
  • 장수호 (한국건설기술연구원 건설산업진흥본부)
  • Received : 2020.10.27
  • Accepted : 2020.11.05
  • Published : 2020.11.30

Abstract

In Korea, fireproof performance is evaluated through a series of fire-resistance tests for important structures, and the performance standard follows the guidelines suggested by ITA. The fireproof duct slab manufactured by combining the slab and the fireproof material with a precast method is effective in that it can eliminate the construction time of the fireproof material. In this study, a series of fire resistance tests was performed on the fire test specimens under the RWS fire scenario in order to secure the fire resistance performance of the precast fireproof duct slab. As a result of the test, it was found that the fireproof performance was secured when the thickness of the fireproof material was 30 mm or more. In both fireproof materials and concrete, the rate of temperature change initially increased, then decreased, and then increased again, and the temperature at the inflection point was measured as 110℃ for all fireproof materials and concrete. It is judged that this occurs when the C-S-H (CaO-SiO2-H2O) generated by the hydration reaction in both the fireproof material and concrete is dehydrated.