Tunnel and Underground Space (터널과지하공간)

Korean Society for Rock Mechanics and Rock Engineering (한국암반공학회)
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Fire Resistance Assessment of Precast Duct Slab with Fireproof using Hardening Accelerator

경화촉진제를 사용한 내화재 일체형 프리캐스트 슬래브의 화재저항성능 평가

  • Soon-Wook, Choi (Department of Geotechnical Engineering Research, Korea Institute of Civil Engineering and Building Technology) ;
  • Tae-Ho, Kang (Department of Geotechnical Engineering Research, Korea Institute of Civil Engineering and Building Technology) ;
  • Chulho, Lee (Department of Geotechnical Engineering Research, Korea Institute of Civil Engineering and Building Technology) ;
  • Se Kwon, Kim (Research Institute, HONG G) ;
  • Tae Kyun, Kim (HONG G) ;
  • Soo-Ho, Chang (Department of Geotechnical Engineering Research, Korea Institute of Civil Engineering and Building Technology)
  • 최순욱 (한국건설기술연구원 지반연구본부) ;
  • 강태호 (한국건설기술연구원 지반연구본부) ;
  • 이철호 (한국건설기술연구원 지반연구본부) ;
  • 김세권 ((주)홍지 기술연구소) ;
  • 김태균 ((주)홍지) ;
  • 장수호 (한국건설기술연구원 지반연구본부 )
  • Received : 2022.11.21
  • Accepted : 2022.11.30
  • Published : 2022.12.31
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Abstract

Precast concrete is an effective method to increase the construction quality and construction speed by optimizing and making the manufacturing conditions similar. In order to more effectively produce a fireproof material-integrated precast duct slab, the purpose of this study was to determine whether the fire resistance performance of the fireproof layer is maintained when a method of increasing the curing rate using a hardening accelerator is used. As a result of performing a fire resistance performance test on specimens classified according to whether or not the hardening accelerator was included, increase of temperature inside the specimen was high in the specimens using the hardening accelerator, and the section loss of the fireproof layer occurred locally on the surface exposed to fire heating. In conclusion, it is judged that the fireproof layer in the case where the strength at 3th day of age is gained within 1 day curing age using a hardening accelerator does not guarantee sufficient fire resistance performance in the conditions used in this study.

프리캐스트 콘크리트는 제작조건을 최적화하고 유사하게 함으로써 시공품질과 시공속도를 높일 수 있는 효과적인 방법이다. 본 연구에서는 좀 더 효과적으로 내화재 일체형 프리캐스트 슬래브 제품을 제작하기 위해, 경화촉진제를 사용하여 양생속도를 증가시키는 방법을 사용할 경우 내화재의 화재저항성능이 유지되는지를 파악하고자 하였다. 경화촉진제 포함 여부에 따라 구분된 시험체에 대해 화재저항성능시험을 수행한 결과, 경화촉진제를 사용한 시험체에서 시험체 내부의 온도증가가 높게 나타났으며, 화재가열면에서 내화재의 단면손실이 국부적으로 발생하였다. 결론적으로 본 연구에서 사용한 조건과 같이 경화촉진제를 사용하여 재령 3일 강도를 재령 1일에 발현시킨 경우의 내화재는 RWS화재시나리오 하에서 충분한 화재저항성능을 보장하지 못하는 것으로 판단된다.

Keywords

Acknowledgement

본 연구는 한국건설기술연구원민간수탁사업 "2020년 지반설계 정수산정 및 분석사업" 중 (주)홍지의 "내화몰탈 일체형 터널 슬래브에 대한 RWS시험"의 지원으로 수행되었습니다.

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