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2022 Vol.32, Issue 6 Preview Page

Technical Note

Fire Resistance Assessment of Precast Duct Slab with Fireproof using Hardening Accelerator

경화촉진제를 사용한 내화재 일체형 프리캐스트 슬래브의 화재저항성능 평가

Soon-Wook Choi1
,
Tae-Ho Kang1*
,
Chulho Lee1
,
Se Kwon Kim2
,
Tae Kyun Kim3
,
Soo-Ho Chang4
최 순욱1
,
강 태호1*
,
이 철호1
,
김 세권2
,
김 태균3
,
장 수호4
1Senior Researcher, Department of Geotechnical Engineering Research, Korea Institute of Civil Engineering and Building Technology
2Department Head, Research Institute, HONG G
3CEO, HONG G
4Senior Research Fellow, Department of Geotechnical Engineering Research, Korea Institute of Civil Engineering and Building Technology
1한국건설기술연구원 지반연구본부 수석연구원
2(주)홍지 기술연구소 부장
3(주)홍지 대표이사
4한국건설기술연구원 지반연구본부 선임연구위원
*Corresponding Author
31 December 2022. pp. 363-372
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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.

Keywords
Tunnel
Fire
Duct slab
Hardening accelerator
Temperature

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.

키워드
터널
화재
풍도슬래브
경화촉진제
온도
References
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Information
  • Publisher :Korean Society for Rock Mechanics and Rock Engineering
  • Publisher(Ko) :한국암반공학회
  • Journal Title :Tunnel and Underground Space
  • Journal Title(Ko) :터널과 지하공간
  • Volume : 32
  • No :6
  • Pages :363-372
  • Received Date : 2022-11-21
  • Revised Date : 2022-11-28
  • Accepted Date : 2022-11-30
  • DOI :https://doi.org/10.7474/TUS.2022.32.6.363
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