Journal of Korean Tunnelling and Underground Space Association (한국터널지하공간학회 논문집)

Korean Tunnelling and Underground Space Association (한국터널지하공간학회)
권호 표지
DOI QR코드

DOI QR Code

Tensile strength evaluation of SFRC subjected to high temperature using double punch test

DPT 실험을 이용한 고온노출된 강섬유보강콘크리트의 인장강도 평가

  • Moon, Do-Young (Department of Civil Engineering, Kyungsung Univ.) ;
  • Chang, Soo-Ho (Geotechnical Engineering Research Division, Korea Institute of Construction Technology) ;
  • Bae, Gyu-Jin (Geotechnical Engineering Research Division, Korea Institute of Construction Technology) ;
  • Lee, Gyu-Pil (Geotechnical Engineering Research Division, Korea Institute of Construction Technology) ;
  • Kim, Hee-Sung (Division of Architecture & Civil Engineering, Dongseo Univ.)
  • 문도영 (경성대학교 토목공학과) ;
  • 장수호 (한국건설기술연구원 Geo-인프라연구실) ;
  • 배규진 (한국건설기술연구원 Geo-인프라연구실) ;
  • 이규필 (한국건설기술연구원 Geo-인프라연구실) ;
  • 김희성 (동서대학교 건축토목공학부)
  • Received : 2012.10.16
  • Accepted : 2013.01.04
  • Published : 2013.01.31
Download PDF
⟨ Previous Next ⟩

Abstract

Steel fiber-reinforced concrete (SFRC) is widely used for tunnel lining structure such as shot-crete in NATM tunnel and segment in TBM tunnel. In tunnel fire accidents, structural performance of a lining is very important because the lining is the structure that directly exposed to fire. In this study, the effects of high temperatures, mix ratios and types on failure pattern, DPT tensile strength and coefficient of variation were investigated through Double Punch Tests (DPT) of SFRC subjected to high temperatures. In the results, it is confirmed that the residual DPT tensile strength increases as for SFRC and this is more in SFRC with higher mix ratio. But, the equation for evaluation of DPT tensile strength does not involve the number of failure surfaces SFRC specimens subjected to high temperatures, therefore, it is required to investigate more fracture energy in DPT tests.

강섬유 보강콘크리트는 NATM 터널의 숏크리트와 세그먼트 등 라이닝에 주로 적용된다. 터널화재시 라이닝은 화재에 직접적으로 노출되기 때문에 고온노출시 SFRC의 성능변화는 매우 중요하다. 본 연구에서는 고온에 노출된 강섬유보강콘크리트의 인장성능을 DPT 실험을 통하여 검토하였다. 고온 노출온도, 강섬유 혼입률 및 종류가 파괴형태, DPT 인장강도, 실험의 변동계수에 미치는 영향을 분석하였다. 실험결과, 강섬유 보강으로 인한 잔존인장강도의 증가를 확인하였으며, 혼입률이 증가할수록 효과적임을 확인하였다. 그러나, DPT 인장강도는 고온노출로 인한 파괴면의 변화를 고려할 수 없기 때문에 파괴에너지의 고찰이 필요한 것으로 판단된다.

Keywords

References

  1. Chao, S.-H, Karki, N.B., Cho, J.-S., Waweru, R.N. (2012), "Use of double punch test to evaluate the mechanical performance of fiber reinforced concrete", HPFRCC6, pp. 27-34.
  2. Choi, S., Jang, S., Kim, H., Jo, B., (2010), "Assessment of structural fire resistance of a fire-proofed immersed tunnel under tunnel fire scenarios", J of Korean Tunn Undergr Assoc, Vol. 12, No. 6, pp. 429-441.
  3. Choi, W., Yun, T., An, S., Choi, Y., Kim, K. (2006) "Fire protection technology based on tunnel fire case", Magazine of the Korea Concrete Institute, Vol. 18, No. 6, pp. 60-67.
  4. Dobashi, H., Konishi, Y., Nakayama, M., Matsubara, K. (2006), "Development of steel fiber reinforced high fluidity concrete segment and application to construction", Tunneling and Underground Space Technology, Vol. 21, p. 422. https://doi.org/10.1016/j.tust.2005.12.066
  5. Jang, S., Choi, S., Kweon, J., Kim, S., Bae, G. (2007), "Alteration of mechanical properties of tunnel structural members after a tunnel fire accident", J of Korean Tunn Undergr Assoc, Vol. 9, No. 2, pp. 157-169.
  6. Khalil, L.W.I. (2006), "Influence of high temperature on steel fiber reinforced concrete", Journal of Engineering and Development", Vol. 10, No. 2, pp. 139-150.
  7. Kim, D. (2010) "Influence of number of twist on tensile behavior of high performance fiber reinforced cementitious composites with twisted steel fibers", Journal of the Korea Concrete Institute, Vol. 22, No. 4, pp. 575-583. https://doi.org/10.4334/JKCI.2010.22.4.575
  8. Lau, A., Anson, M. (2006), "Effect of high temperatures on high performance steel fibre reinforced concrete", Cement and Concrete Research, Vol. 36, pp. 1698-1707. https://doi.org/10.1016/j.cemconres.2006.03.024
  9. Malatesta, S.C., Aguado, A., Molins, C., Cabrera, M. (2009), "Quality control of fiber reinforced concretes by mean of double punshing test (barcelona test)", Revista Ingenieria de Construccion, Vol.24, No. 2, pp. 119-140.
  10. Malatesta. S.C., Aguado, A., Molins, C. (2012), "Generalization of the Barcelona test for the toughness control of FRC", Materials and Structures, Vol. 45, pp. 1053-1069. https://doi.org/10.1617/s11527-011-9816-8
  11. Molins, C, Aguado A, Saludes, S.(2008), "Double punch test to control the energy dissipation in tension of FRC (Barcelona test)", Materials and Structures, Vol. 42, No. 4, p. 415.
  12. Park, H., Jeon, S., Lee, M. (2005) "Fireproof techniques for tunnel structures", Magazine of the Korea Concrete Institute, Vol. 17, No. 5, pp. 76-80.
  13. Sukontasukkul, P., Pomchiengpin, W., Songpiriyakij, S. (2010), "Post-crack(or post-peak) flexural response and toughness of fiber reinforced concrete after exposure to high temperature", Construction and Building Materials, Vol. 24, Issue 10, pp. 1967-974. https://doi.org/10.1016/j.conbuildmat.2010.04.003
  14. Yoo, Y., Kweon, O. (2010), "A study of the HRR and fire propagation phenomena for the fire safety design of deep road tunnel ", J of Korean Tunn Undergr Assoc, Vol. 12, No. 4, pp. 321-328.

Cited by

  1. Evaluation of mechanical properties of steel-fibre-reinforced concrete exposed to high temperatures by double-punch test vol.79, 2015, https://doi.org/10.1016/j.conbuildmat.2015.01.042