Journal of the Korea Concrete Institute (콘크리트학회논문집)

Korea Concrete Institute (한국콘크리트학회)
권호 표지
DOI QR코드

DOI QR Code

A Study on the Residual Mechanical Properties of Fiber Reinforced Concrete with High Temperature and Load

고온 및 하중에 따른 섬유보강 콘크리트의 잔존 역학적 특성에 관한 연구

  • Kim, Young-Sun (Center for Fire Science and Technology, Tokyo University of Science) ;
  • Lee, Tae-Gyu (Dept. of Architectural Engineering, Chungnam National University) ;
  • Nam, Jeong-Soo (Dept. of Architectural Engineering, Chungnam National University) ;
  • Park, Gyu-Yeon (POSCO Engineering&Construction Co., Ltd.) ;
  • Kim, Gyu-Yong (Dept. of Architectural Engineering, Chungnam National University)
  • Received : 2011.01.04
  • Accepted : 2011.02.24
  • Published : 2011.06.30
Download PDF
⟨ Previous Next ⟩

Abstract

Recently, the effects of high temperature and fiber content on the residual mechnical properties of high-strength concrete were experimentally investigated. In this paper, residual mechanical properties of concrete with water to cement (w/c) ratios of 0.55, 0.42 and 0.35 exposed to high temperature are compared with those obtained in fiber reinforced concrete with similar characteristics ranging from 0.05% to 0.20% polypropylene (PP) fiber volume percentage. Also, factors including pre-load levels of 20% and 40% of the maximum load at room temperature are considered. Outbreak time, thermal strain, length change, and mass loss were tested to determine compressive strength, modulus of elasticity, and energy absorption capacity. From the results, in order to prevent the explosive spalling of 50 MPa grade concretes exposed to high temperature, more than 0.05 vol. % of PP fibers is needed. Also, the cross-sectional area of PP fiber can influence the residual mechanical properties and spalling tendency of fiber reinforced concrete exposed to high temperature. Especially, the external loading increases not only the residual mechanical properties of concrete but also the risk of spalling and brittle failure tendency.

최근, 고강도 콘크리트의 잔존 역학적 특성에 관한 섬유의 혼입과 고온의 영향은 실험적으로 연구되어지고 있다. 이 논문에서는 고온에 노출된 물시멘트비 55%, 42% 및 35%에 따른 콘크리트의 잔존 역학적 특성을 0.05~0.20 vol.%의 범위로 폴리프로필렌 섬유를 혼입한 콘크리트와 비교하여 평가하였고, 고려된 요인은 섬유 혼입량, 콘크리트 강도 및 재하 하중량이다. 폭렬 발생 시간, 열팽창 변형, 길이 변화 및 중량 감소의 측정과 압축강도, 탄성계수 및 에너지 흡수 능력의 평가를 실시했다. 결과로서는 고온에 노출된 50 MPa급 콘크리트의 폭렬을 방지하기 위해서 0.05 vol.% 이상의 PP섬유가 필요했다. 또한, PP섬유의 단면적은 고온에 노출된 섬유보강 콘크리트의 폭렬 경향과 잔존 역학적 특성에 관해서 영향을 미치는 것으로 나타났다. 특히, 외부 하중은 콘크리트의 잔존 역학적 특성 뿐만 아니라 폭렬의 위험 및 취성적 경향을 증가시켰다.

Keywords

References

  1. 김규용, 김영선, 이태규, 박찬규, 이승훈, "설계하중 사전 재하 및 비재하방식에 의한 고강도 콘크리트의 고온 특성 평가," 콘크리트학회 논문집, 20권, 5호, 2008, pp. 583-592.
  2. 김흥열, 서치호, "고온 가열시 콘크리트의 강도 영역별 물리적 특성에 관한 실험적 연구," 대한건축학회 논문집 (구조계), 20권, 11호, 2004, pp. 75-81.
  3. Poon, C. S., Shui, Z. H., and Lam, L., "Compressive Behavior of Fiber Reinforced High-Performance Concrete Subjected to Elevated Temperatures," Cement and Concrete Research, Vol. 34, 2004, pp. 2215-2222. https://doi.org/10.1016/j.cemconres.2004.02.011
  4. 한천구, 한민철, 김원기, 이주선, "고강도 콘크리트의 폭렬 방지에 미치는 혼화재 및 PP 섬유의 영향," 대한건축학회 논문집(구조계), 25권, 11호, 2009, pp. 105-112.
  5. 염광수, 전현규, 김흥렬, "섬유 혼입 공법을 적용한 고강도 콘크리트 기둥의 재하 내화시험," 콘크리트학회 논문집, 21권, 4호, 2009, pp. 473-480.
  6. 원종필, 장창일, 김흥렬, 김완영, "폴리프로필렌섬유 혼입률에 따른 고강도 콘크리트 기둥 부재의 폭렬 및 내부온도 분포 특성," 콘크리트학회 논문집, 20권, 6호, 2008, pp. 821-826.
  7. A. Bilodeau, V. K. R. and Kodur, G. C. Hoff, Optimization of the Type and Amount of Polypropylene Fibres for Preventing the Spalling of Lightweight Concrete Subjected to Hydrocarbon Fire, Cement & Concrete Composites, Vol. 26, 2004, pp. 163-174. https://doi.org/10.1016/S0958-9465(03)00085-4
  8. Kalifa, P., Chéné, G., and Gallé, C., "High-Temperature Behaviour of HPC with Polypropylene Fibres from Spalling to Microstructure," Cement and Concrete Research, Vol. 31, 2001, pp. 1487-1499. https://doi.org/10.1016/S0008-8846(01)00596-8
  9. Peng, G. F., Yang, W., Zhao, J., Liu, Y. F., Bian, S. H., and Zhao, L. H., "Explosive Spalling and Residual Mechanical Properties of Fiber-Toughened High-Performance Concrete Subjected to High Temperatures," Cement and Concrete Research, Vol. 36, 2006, pp. 723-727. https://doi.org/10.1016/j.cemconres.2005.12.014
  10. Castillo, C. and Durrani, A. J., "Effect of Transient High Temperature on High-Strength Concrete," ACI Materials Journal, Vol. 87, No. 1, 1990, pp. 47-53.
  11. Diederichs, U., Jumppanen, U. M., and Penttala, V., "Material Properties of High Strength Concrete at Elevated Temperatures," LABSE 13th Congress, Helsinki, 1988.
  12. Abrams, M. S., "Compressive Strength of Concrete at Temperature to 1600F," American Concrete Institute (ACI) SP25, Temperature and Concrete, Detroit, Michigan, 1971, 10 pp.
  13. Chan, Y. N., Luo, X., and Sun, W., "Compressive Strength and Pore Structure of High-Performance Concrete after Exposure to High Temperature up to $800{^{\circ}C}$," Cement Concrete Research, Vol. 30, 2000, pp. 247-251. https://doi.org/10.1016/S0008-8846(99)00240-9
  14. Alhozaimy, A. M., Soroushian, P., and Mirza, F., "Mechainical Properties of Polypropylene Fiber Reinforced Concrete and the Effects of Pozzolanic Materials," Cement Concrete Composites, Vol. 18, 1996, pp. 85-92. https://doi.org/10.1016/0958-9465(95)00003-8
  15. Momose, H., "An Eexperimental Study on the Fire Resistance Properties of Polypropylene Fiber Reinforced Ultra High-Strength Concrete of 150 $N/mm^{2}$," Japan Concrete Institute Annual Convention, Japan, 2003, pp. 995-1000.
  16. 한천구, 지석원, 김경민, 허영선, 김성환, "PP 및 PVA 섬 유를 혼입한 고성능 콘크리트의 내화 성능 분석," 대한건축학회 논문집(구조계), 22권, 10호, 2006, pp. 77-84.
  17. Schneider, U., "Behaviour of Concrete at High Temperatures," Wilhelm Ernst & Sohn Verlag, Berin, 1982, 130 pp.
  18. 한국콘크리트학회, "철근콘크리트 구조물의 내화 특성," 기문당, KCI SP 4, 2005, 207 pp.
  19. Hirashima, T., Toyoda, K., Yamashita, H., Tokoyoda, M., and Uesugi, H., "Compression Tests of High-Strength Concrete Cylinders at Elevated Temperature," International Workshop fib 2007, Fire Design of Concrete Structure, University of Coimbra, Portugal, 2007, 12 pp.
  20. Heo, Y. S., Sanhayan, J. G., Han, C. G., and Han, M. C., "Synergistic Effect of Combined Fibers for Spalling Protection of Concrete in Fire," Cement and Concrete Research, Vol. 40, 2010, pp. 1547-1554. https://doi.org/10.1016/j.cemconres.2010.06.011
  21. Kodur, V. K. R. and Sultan, M. A., "Effect of Temperature on Thermal Properties of High-Strength Concrete," Journal of Materials in Civil Engineering, Vol. 15, No. 2, 2003, pp. 101-107. https://doi.org/10.1061/(ASCE)0899-1561(2003)15:2(101)
  22. Blackman, S. James, "Method for Estimating Water Content of Concrete at the Time of Hardening," ACI Journal, Proceedings, Vol. 50, No. 7, 1954, pp. 533-544.
  23. Nataraja, M. C., Dhang, N., and Gupta, A. P., "Stress-Strain Curves for Steel-Fibre Reinforced Concrete under Compression," Cement Concrete Composite, Vol. 21, 1999, pp. 383-390. https://doi.org/10.1016/S0958-9465(99)00021-9

Cited by

  1. State-of-the-Art Research and Experimental Assessment on Fire-Resistance Properties of High Strength Concrete vol.18, pp.3, 2014, https://doi.org/10.11112/jksmi.2014.18.3.028