All Issue

2020 Vol.22, Issue 6 Preview Page

Research Paper

Fire resistance assessment of precast fireproof duct slab

프리캐스트 방식 내화풍도슬래브의 화재저항성 평가

Soon-Wook Choi1†
,
Tae-Ho Kang1
,
Chulho Lee1
,
Se Kwon Kim2
,
Tae Kyun Kim3
,
Soo-Ho Chang2
최 순욱1†
,
강 태호1
,
이 철호1
,
김 세권2
,
김 태균3
,
장 수호2
1Senior Researcher, Underground Space Safety Research Center, Korea Institute of Civil Engineering and Building Technology
2Department Head, Research Institute, HONG G
3CEO, HONG G
Senior Research Fellow, Construction Industry Promotion Department, Korea Institute of Civil Engineering and Building Technology
1정회원, 한국건설기술연구원 지하공간안전연구센터 수석연구원
2비회원, (주)홍지 기술연구소 부장
3정회원, (주)홍지 대표이사
정회원, 한국건설기술연구원 건설산업진흥본부 선임연구위원
*soonugi@kict.re.kr
November 2020. pp. 669-680
PDF XML Citation
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°C 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.

Keywords
Tunnel
Fire
Duct slab
Fireproofing
Temperature

국내에서는 중요 구조물을 대상으로 별도의 내화시험을 통해 내화성능을 평가하고 있으며, 그 성능기준으로 ITA에서 제시하고 있는 가이드라인을 따르고 있다. 프리캐스트 방식으로 슬래브와 내화재가 일체화되어 제작되는 내화풍도슬래브는 내화재 시공시간을 단축할 수 있다는 점에서 효과적이다. 본 연구에서는 풍도슬래브의 내화성능을 확보하기 위해 RWS화재시나리오 하에서 내화시험체에 대한 화재저항시험을 수행하였다. 시험결과, 내화재 두께가 30 mm 이상에서 내화성능을 확보하는 것으로 나타났다. 내화재와 콘크리트 모두에서 온도 변화율이 초기에 증가했다가 감소하고 다시 증가하는 경향이 나타났으며, 다시 증가하는 변곡점에서의 온도가 모든 내화재와 콘크리트에서 110°C로 측정되었다. 이것은 내화재와 콘크리트가 모두 수화반응에 의해 생성된 C-S-H (CaO-SiO2-H2O)가 탈수되면서 발생하는 것으로 판단된다.

키워드
터널
화재
풍도슬래브
내화
온도
References
1
Chang, S.H., Choi, S.W., Kwon, J.W., Kim, S.H., Bae, G.J. (2007), "Alteration of mechanical properties of tunnel structural members after a tunnel fire accident", Journal of Korean Tunnelling and Underground Space Association, Vol. 9, No. 2, pp. 157-169.
2
Choi, S.W., Chang, S.H., Kim, H.Y., Jo, B.H. (2010), "Assessment of structural fire resistance of a fire-proofed immersed tunnel under tunnel fire scenarios", Journal of Korean Tunnelling and Underground Space Association, Vol. 12, No. 6, pp. 429-441.
3
Choi, S.W., Lee, G.P., Chang, S.H., Park, Y.T., Bae, G.J. (2014), "Fire resistance assessment of high strength segment concrete depending on PET fiber amount under fire curves", Journal of Korean Tunnelling and Underground Space Association, Vol. 16, No. 3, pp. 311-320. 10.9711/KTAJ.2014.16.3.311
4
Hertz, K.D. (2003), "Limits of spalling of fire-exposed concrete", Fire Safety Journal, Vol. 38, No. 2, pp. 103-116. 10.1016/S0379-7112(02)00051-6
5
ITA (2004), Guidelines for structural fire resistance for road tunnels, Working Group No. 6 Maintenance and Repair, pp. 21.
6
JCI (2002), Report of research committee on fire safety of concrete structures, Japan Concrete Institute (JCI) [in Japanese].
7
Khoury, G.A. (1992), "Compressive strength of concrete at high temperatures: a reassessment", Magazine of Concrete Research, Vol. 44, No. 161, pp. 291-309. 10.1680/macr.1992.44.161.291
8
Khoury, G.A. (2002), "Passive protection against fire", Tunnels & Tunnelling International, Vol. 34, No. 11, pp. 40-42.
9
Khoury, G.A., Majorana, C.E., Pesavento, F., Schrefler, B.A. (2002), "Modelling of heated concrete", Magazine of Concrete Research, Vol. 54, No. 2, pp. 77-101. 10.1680/macr.2002.54.2.77
10
Kodur, V.K.R., Phan, L. (2007), "Critical factors governing the fire performance of high strength concrete systems", Fire Safety Journal, Vol. 42, No. 6-7, pp. 482-488. 10.1016/j.firesaf.2006.10.006
11
MOLIT (2020), Road tunnel disaster prevention facility installation and management guidelines, Ministry of Land, Infrastructure and Transport.
12
Phan, L.T. (1996), Fire performance of high-strength concrete: a report of the state-of-the-art, NISTIR 5934, National Institute of Standards and Technology, pp. 59-60. 10.6028/NIST.IR.5934
Information
  • Publisher :Korean Tunneling and Underground Space Association
  • Publisher(Ko) :한국터널지하공간학회
  • Journal Title :Journal of Korean Tunnelling and Underground Space Association
  • Journal Title(Ko) :한국터널지하공간학회 논문집
  • Volume : 22
  • No :6
  • Pages :669-680
  • Received Date : 2020-10-27
  • Revised Date : 2020-11-03
  • Accepted Date : 2020-11-05
  • DOI :https://doi.org/10.9711/KTAJ.2020.22.6.669
Journal Informaiton Journal of Korean Tunnelling and Underground Space Association Journal of Korean Tunnelling and Underground Space Association
Online Submission & Review System
  • NRF
  • KOFST
  • KISTI Current Status
  • KISTI Cited-by
  • crosscheck
  • orcid
  • open access
  • ccl
Journal Informaiton Journal Informaiton - close