Fire resistance assessment of segment lining with PP fiber amount

Soon-Wook Choi; Tae-Ho Kang; Chulho Lee; Hae Song Kim; Byoungcheol Ahn; Soo-Ho Chang

doi:10.9711/KTAJ.2021.23.5.303

All Issue

2021 Vol.23, Issue 5 Preview Page Next Page

Technical Paper

Fire resistance assessment of segment lining with PP fiber amount PP섬유 혼입량에 따른 세그먼트 라이닝의 화재저항성 평가

30 September 2021. pp. 303-314

PDF XML

Abstract

With the high quality/high stiffness/high strength of segment lining, segment lining is increasingly used as the final lining of the tunnel. Precast concrete lining has higher quality and strength than field concrete. Paradoxically, this contributes to greater damage to concrete in the event of a fire in a tunnel. In this study, tests were conducted to determine the fire resistance performance of segment linings according to fiber content in fire resistance methods using synthetic fibers such as PP fibers. As a result, it was confirmed that fire resistance performance required by the relevant project can be secured when using 1.5 kg/m³ of PP fiber. In addition, comparison of the results of PP fibers with PET, a similar synthetic fiber, showed better fire resistance performance than when PP fibers were used.

Keywords

Tunnel

Segment

Fire resistance

PP fiber

Temperature

세그먼트 라이닝의 고품질/고강성/고강도화에 따라 세그먼트 라이닝을 터널의 최종 라이닝으로 삼는 경우가 증가하고 있다. 프리캐스트 콘크리트 라이닝은 현장타설 콘크리트에 비해 품질 및 강도가 높다. 역설적으로 이러한 점은 터널 내 화재 시 콘크리트의 손상을 더 크게 하는 요인이 된다. 본 연구에서는 PP 섬유와 같은 합성섬유를 이용한 내화방법에서 섬유함유량에 따라 세그먼트 라이닝의 화재저항성능을 파악하기 위한 시험을 수행하였다. 그 결과, PP섬유 1.5 kg/m³ 사용 시 관련 프로젝트에서 요구한 화재저항성능을 확보할 수 있음을 확인하였다. 더불어 유사한 함성섬유인 PET를 사용하였을 경우와 PP섬유의 결과를 비교한 결과, PP섬유가 PET섬유를 사용하였을 경우에 비해 더 좋은 화재저항성능이 나타냄을 알 수 있었다.

키워드

터널

세그먼트

화재저항

PP섬유

온도

References

ASTM E794-06 (2018), Standard test method for melting and crystallization temperatures by thermal analysis, ASTM, pp. 1-4.

Beard, A., Carvel, R. (2005), The Handbook of Tunnel Fire Safety, Thomas Telford Publishing, London, pp. 113-115. 10.1680/hotfs.31685

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.

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.

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

Clement, F., Focaracci, A. (2011), “Fire protection in tunnels: requirements, solutions and case histories”, Proceedings of WTC2011, Helsinki, Finland.

EN 1992-1-2 (2004), Eurocode 2: Design of concrete structures—Part 1–2: General rules—Structural fire design; Authority: The European Union Per Regulation 305/2011, Directive 98/34/EC, Directive 2004/18/EC; European Union: Brussels, Belgium, 2004, pp. 60.

Hager, I., Mróz, K., Tracz, T. (2019), “Contribution of polypropylene fibres melting to permeability change in heated concrete - the fibre amount and length effect”, Proceedings of the IOP Conference Series: Materials Science and Engineering, Vol. 706, No. 1, Montevideo, pp. 012009. 10.1088/1757-899X/706/1/012009

ITA (2004), Guidelines for structural fire resistance for road tunnels, Working Group No. 6 Maintenance and Repair, pp. 2-4~6.

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

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

KS M 3016: 2011, A (2011), Testing method of the density and specific gravity for plastics (A method), Korean Standards Association, pp. 1-10.

Lee, G.P., Park, Y.T., Choi, S.W., Bae, G.J., Chang, S.H., Kang, T.S., Lee, J.S. (2012), “An experimental study on mechanical behavior of shield segment with high-strength concrete and high-tension rebar”, Journal of Korean Tunnelling and Underground Space Association, Vol. 14, No. 3, pp. 215-230. 10.9711/KTAJ.2012.14.3.215

Melbye, T., Dimmock, R. (2006), “Thermal barriers and fibre concrete roles in the passive fire protection of tunnels”, Shotcrete for Underground Support X, ASCE 2006, pp. 285-297. 10.1061/40885(215)23

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. 54-56. 10.6028/NIST.IR.5934

Ulm, F.J., Coussy, O., Bažant, Z.P. (1999), “The “Chunnel” fire. I: Chemoplastic softening in rapidly heated concrete”, Journal of Engineering Mechanics, Vol. 125, No. 3, pp. 272-282. 10.1061/(ASCE)0733-9399(1999)125:3(272)

Zeiml, M., Leithner, D., Lackner, R., Mang, H.A. (2006), “How do polypropylene fibers improve the spalling behavior of in-situ concrete?”, Cement and Concrete Research, Vol. 36, No. 5, pp. 929-942. 10.1016/j.cemconres.2005.12.018

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 : 23
No :5
Pages :303-314
Received Date : 2021-08-24
Revised Date : 2021-09-10
Accepted Date : 2021-09-13
DOI :https://doi.org/10.9711/KTAJ.2021.23.5.303

Journal of Korean Tunnelling and Underground Space Association ISSN:2233-8292(Print) 2287-4747(Online) 한국터널지하공간학회 논문집

All Issue