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Compressive strength and failure behaviour of fibre reinforced concrete at elevated temperatures

  • Received : 2015.07.20
  • Accepted : 2015.12.23
  • Published : 2015.12.25

Abstract

This paper presents the effects of elevated temperatures of $400^{\circ}C$ and $800^{\circ}C$ on the residual compressive strength and failure behaviour of fibre reinforced concretes and comparison is made with that of unreinforced control concrete. Two types of short fibres are used in this study e.g., steel and basalt fibres. The results show that the residual compressive strength capacity of steel fibre reinforced concrete is higher than unreinforced concrete at both elevated temperatures. The basalt fibre reinforced concrete, on the other hand, showed lower strength retention capacity than the control unreinforced concrete. However, the use of hybrid steel-basalt fibre reinforcement recovered the deficiency of basalt fibre reinforced concrete, but still slightly lower than the control and steel fibres reinforced concretes. The use of fibres reduces the spalling and explosive failure of steel, basalt and hybrid steel-basalt fibres reinforced concretes oppose to spalling in deeper regions of ordinary control concrete after exposure to above elevated temperatures. Microscopic observation of steel and basalt fibres surfaces after exposure to above elevated temperatures shows peeling of thin layer from steel surface at $800^{\circ}C$, whereas in the case of basalt fibre formation of Plagioclase mineral crystals on the surface are observed at elevated temperatures.

Keywords

concrete;fibres;elevated temperatures;fire;compressive strength;failure behaviour

References

  1. Ali, F.A., Connolly, R. and Sullivan, P.J.E. (1996), "Spalling of high strength concrete at elevated temperatures", J. Appl. Fire Sci., 6(1), 3-14. https://doi.org/10.2190/29U1-DTKK-42A5-DQQL
  2. Ayub, T., Shafiq, N. and Nuruddin, M.F. (2014), "Mechanival properties of high performance concrete reinforced with basalt fibres", Procedia Eng., 77, 131-139. https://doi.org/10.1016/j.proeng.2014.07.029
  3. Borhan, T.M. (2013), "Thermal and mechanical properties of basalt fibre reinforced concrete", Int. scholarly Sci. Res. Innov., 7(4), 712-715.
  4. Chen, B. and Liu, J. (2004), "Residual strength of hybrid-fiber-reinforced high-strength concrete after exposure to high temperatures", Cement Concrete Res., 34(6), 1065-1069. https://doi.org/10.1016/j.cemconres.2003.11.010
  5. Dias, D.P. and Thaumaturgo, C. (2005), "Fracture toughness of geopolymeric concretes reinforced with basalt fibers", Cement Concrete Comp., 27(1), 49-54. https://doi.org/10.1016/j.cemconcomp.2004.02.044
  6. Dugenci, O., Haktanir, T. and Altun, F. (2015), "Experimental research for the effect of high temperature on the mechanical properties of steel fibre reinforced concrete", Constr. Build. Mater. 75, 82-88. https://doi.org/10.1016/j.conbuildmat.2014.11.005
  7. EN 1994-1-2 (2003), Design of composite steel and concrete structures-part 1-2: general rules - structural fire design, Eurocodes.
  8. Ezeldin, A.S. and Balaguru, P.N. (1992), "Normal-and high-strength fiber-reinforced concrete under compression", J. Mater. Civil Eng., 4(4), 415-429. https://doi.org/10.1061/(ASCE)0899-1561(1992)4:4(415)
  9. Fanella, D.A. and Naaman, A.E. (1985), "Stress-strain properties of fiber reinforced mortar in compression", ACI J., 82(4), 475-483.
  10. Jiang, C., Fan, K., Wu, F. and Chen, D. (2014), "Experimental study on the mechanical properties and microstructure of chopped basalt fibre reinforced concrete", Mater. Des., 58, 187-193. https://doi.org/10.1016/j.matdes.2014.01.056
  11. Kim, J. and Lee, G.P. (2015), "Evaluation of mechanical properties of steel-fibre-reinforced concrete exposed to high temperatures by double-punch test", Constr. Build. Mater., 79, 182-191. https://doi.org/10.1016/j.conbuildmat.2015.01.042
  12. Ma, J., Qiu, X., Cheng, L. and Wang, Y. (2010), "Experimental research on the fundamental mechanical properties of presoaked basalt fibre concrete", Proceedings of the 5th International Conference on FRP Composites in Civil Engineering, Beijing, China.
  13. Poon, C.S., Shui, Z.H. and Lam, L. (2004), "Compressive behavior of fiber reinforced high-performance concrete subjected to elevated temperatures", Cement Concrete Res., 34(12), 2215-2222. https://doi.org/10.1016/j.cemconres.2004.02.011
  14. Shaikh, F.U.A. and Vimonsatit, V. (2015), "Compressive strength of fly-ash-based geopolymer concrete at elevated temperatures", Fire Mater., 39(2), 174-188. https://doi.org/10.1002/fam.2240
  15. Stockmann, G.J., Wolff-Boenisch, D., Bovet, N., Gislason, S.R. and Oelkers, E.H. (2014), "The role of silicate surfaces on calcite precipitation kinetics", Geochimica et Cosmochimica Acta, 135, 231-250. https://doi.org/10.1016/j.gca.2014.03.015
  16. Suhaendi, S.L. and Horiguchi, T. (2006), "Effect of short fibers on residual permeability and mechanical properties of hybrid fibre reinforced high strength concrete after heat exposition", Cement Concrete Res., 36(9), 1672-1678. https://doi.org/10.1016/j.cemconres.2006.05.006
  17. Wetzig, V. (2002), "The fire resistance of various types or air placed concrete", 4th International Symposium on Sprayed Concrete, 352, Davos, Switzerland, September.