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http://dx.doi.org/10.4334/JKCI.2009.21.4.465

Fire Test of Fiber Cocktail Reinforced High Strength Concrete Columns without Loading  

Youm, Kwang-Soo (Research Development Team, GS E&C Research Institute, GS E&C)
Jeon, Hun-Kyu (Research Development Team, GS E&C Research Institute, GS E&C)
Kim, Heung-Youl (Fire & Engineering Services Research Center, Korea Institute of Construction Technology)
Publication Information
Journal of the Korea Concrete Institute / v.21, no.4, 2009 , pp. 465-471 More about this Journal
Abstract
To prevent the explosive spalling of the high strength concrete and control the rise of temperature in the steel rebar during fire, a fiber cocktail method has been proposed simultaneously with the use of polypropylene and steel fiber. After applying the fiber cocktail (polypropylene and steel fibers) into the mixture of high strength concrete with a compressive strength of between 40 and 100 MPa and evaluating the thermal properties at elevated temperatures, the fire test was carried out on structural members in order to evaluate the fire resistance performance. Two column specimens were exposed to the fire without loading for 180 minutes based on the standard curve of ISO-834. No explosive spalling has been observed and the original color of specimen surface was changed to light pinkish grey. The inner temperature of concrete dropped rapidly starting from 60mm deep. After 60 minutes of exposure to the fire, the temperature gradient of fiber cocktail reinforced high strength concrete was measured as 2.2oC/mm, which is approximately 5 times less than that of normal concrete. The final temperatures of steel rebar after 180 minutes of fire test resulted in 488.0oC for corner rebar, 350.9oC for center rebar, and 419.5oC for total mean of steel rebar. The difference of mean temperature between corner and center rebar was 137.1oC The tendency of temperature rise in concrete and steel rebar changed between 100oC and 150oC The cause of decrease in temperature rise was due to the water vaporization in concrete, the lower temperature gradient of the concrete with steel and polypropylene fiber cocktails, the moisture movement toward steel rebars and the moisture clogging.
Keywords
fiber cocktail method; fire test without loading; temperature gradient; explosive spalling;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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1 Suhaendi, S.L. and Horiguchi, T., “Effect of Short Fibers on Residual Permeability and Mechanical Properties of Hybrid Fibre Reinforced High Strength Concrete after Heat Eposition,” Cement and Concrete Research, Vol 36, 2006, pp. 1672-1678   DOI   ScienceOn
2 Nishida, A., Ymazaki, N., Inoue, H., Schneider, U., and Diederichs, U., “Study on the Properties of High-Strength Concrete with Short Polypropylene Fibre for Spalling Resistance,” Proceedings of International Conference on Concrete under Severe Conditions. CONSEC'95, Vol.2, Sapporo, Japan, 1995, pp. 1141-50
3 Atkinson, T., “Polypropylene Fibers Control Explosive Spalling in High-Performance Concrete,” Concrete, Vol. 38, No. 10, 2004, pp. 69-70
4 원종필, 장창일, 이상우, 김흥열, 김완영, “하이브리드 섬유보강 고강도콘크리트 기둥부재의 내화성능,” 콘크리트학회 논문집, 20권, 6호, 2008, pp. 827-832   과학기술학회마을   DOI
5 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, No. 12, 2004, pp. 2215-2222   DOI   ScienceOn
6 Ali, F., “Is High Strength Concrete More Susceptible to Explosive Spalling than Normal Strength Concrete in Fire?,” Fire and Materials, Vol. 26, 2002, pp. 127-130   DOI   ScienceOn
7 국토해양부 고시, 고강도콘크리트 기둥·보의 내화성능 관리기준, 제2008-334호, 2008, pp. 1-8
8 김흥열, 채한식, 전현규, 염광수, “Fiber Cocktail을 혼입한 고강도콘크리트의 고온시 탄성계수 특성 및 모델 제시에 관한 실험적 연구,” 한국콘크리트학회 학술발표논문집, 19권, 2호, 2007, pp. 609-612
9 Purkiss, J. A., “Steel Fibre Reinforced Concrete at Elevated Temperatures,” International Journal of Cement Composites and Lightweight Concrete, Vol. 6, No. 3, 1984, pp. 179-184   DOI   ScienceOn
10 Lie, T. T. and Kodur, V. K. R., “Thermal and Mechanical Properties of Steel-Fibre-Reinforced Concrete at Elevated Temperatures,” Canadian Journal of Civil Engineering, Vol. 23, 1996, pp. 511-517   DOI   ScienceOn
11 Yuzer, N., Akoza, F., and Ozturkb, L., “Compressive Strength-Color Change Relation in Mortars at High Temperature,” Cement and Concrete Research, Vol. 34, No. 10, 2004, pp. 1803-1807   DOI   ScienceOn
12 김흥열, 채한식, 전현규, 염광수, “Fiber Cocktail을 혼입한 고강도콘크리트의 고온시 압축강도 특성 및 모델 제시에 관한 실험적 연구,” 한국콘크리트학회 학술발표논문집, 19권, 2호, 2007, pp. 605-608
13 김흥열, 채한식, 전현규, 염광수, “Fiber Cocktail을 혼입한 고강도콘크리트의 고온시 변형특성 및 모델 제시에 관한 실험적 연구,” 한국콘크리트학회 학술발표논문집, 19권, 2호, 2007, pp. 877-880
14 Concrete Center, Concrete and Fire, The Concrete Center, 2004, 4 pp
15 한국콘크리트학회, “콘크리트구조설계 기준,” 한국콘크리트학회, 2003, pp. 121-122
16 Chung, J. H. and Consolazio, G. R, “Numerical Modeling of Transport Phenomena in Reinforced Concrete Exposed to Elevated Temperatures,” Cement and Concrete Research, Vol. 35, 2005, pp. 597-608   DOI   ScienceOn