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Strength loss contributions during stages of heating, retention and cooling regimes for concretes

  • Yaragal, Subhash C. (Department of Civil Engineering, National Institute of Technology Karnataka) ;
  • Warrier, Jishnu (Department of Civil Engineering, National Institute of Technology Karnataka) ;
  • Podila, Ramesh (Department of Civil Engineering, National Institute of Technology Karnataka)
  • 투고 : 2014.07.14
  • 심사 : 2015.02.16
  • 발행 : 2015.03.25

초록

Concrete suffers strength loss when subjected to elevated temperatures during an accidental event such as fire. The loss in strength of concrete is mainly attributed to decomposition of C-S-H gel and release of chemically bound water, which begins when the temperature exceeds $500^{\circ}C$. But it is unclear about how much strength loss occurs in different stages of heating, retention and cooling regimes. This work is carried out to separate the total strength loss into losses during different stages of heating, retention and cooling. Tests were carried out on both Ordinary Portland Cement (OPC) based concrete and Ground Granulated Blast Furnace Slag (GGBFS) blended concrete for $200^{\circ}C$, $400^{\circ}C$, $600^{\circ}C$ and $800^{\circ}C$ with a retention period of 1 hour for each of these temperature levels. Furnace cooling was adopted throughout the experiment. This study reports strength loss contribution during heating, retention and cooling regimes for both OPC based and GGBFS based concretes.

키워드

참고문헌

  1. Allen, D.C. and Desai, P.M. (1967), "The influence of aggregate on the behaviour of concrete at elevated temperature", Nuclear Eng. Des., 6, 65-77. https://doi.org/10.1016/0029-5493(67)90047-7
  2. Arioz, O. (2007), "Effects of elevated temperatures on properties of concrete", Fire Saf. J., 42, 516-522. https://doi.org/10.1016/j.firesaf.2007.01.003
  3. Bingol, A.F. and Gul, R. (2009), "Effect of elevated temperatures and cooling regimes on normal strength concrete", Fire Mater., 33, 79-88. https://doi.org/10.1002/fam.987
  4. Biolzi, L., Cattaneo, S. and Rosati, G. (2008), "Evaluating residual properties of thermally damaged concrete", Cement Concrete Compos., 30, 907-916. https://doi.org/10.1016/j.cemconcomp.2008.09.005
  5. Culfik, M.S. and Ozturan, T. (2002), "Effect of elevated temperatures on the residual mechanical properties of high -performance mortar", Cement Concrete Res., 32, 809-816. https://doi.org/10.1016/S0008-8846(02)00709-3
  6. Ikponmwosa, E.E. and Salau, M.A. (2010), "Effect of heat on laterised concrete", Maejo Int. J. Sci. Tech., 4(1), 33-42.
  7. Poon, C.S., Shui, Z.H. and Lam, L. (2004), "Compressive behaviour of fibre reinforced high performance concrete subjected to elevated temperatures", Cement Concrete Res., 34, 2215-2222. https://doi.org/10.1016/j.cemconres.2004.02.011
  8. Toumi, B., Resheidat, M., Guemmadi, Z. and Chabil, H. (2009), "Coupled effect of high temperature and heating time on the residual strength of normal and high -strength concretes", Jordan J. Civil Eng., 3(4).
  9. Yaragal, S.C., Babu Narayan, K.S., Venkataramana, K., Kulkarni, K.S., Chinnagiri Gowda, H.C., Reddy, G.R. and Sharma, A. (2010), "Studies on normal strength concrete cubes subjected to elevated temperatures", J. Struct. fire Eng., 1(4), 249-262. https://doi.org/10.1260/2040-2317.1.4.249
  10. Yaragal, S.C., Babu Narayan, K.S. and Adari, S. (2012), "Strength characteristics of concrete exposed to elevated temperatures and cooled under different regimes", J. Struct. fire Eng., 3(4), 301-310. https://doi.org/10.1260/2040-2317.3.4.301