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Confinement effectiveness of CFRP strengthened concrete cylinders subjected to high temperatures

  • Raoof, Saad M. (Department of Civil Engineering, University of Tikrit) ;
  • Ibraheem, Omer F. (Department of Civil Engineering, University of Tikrit) ;
  • Tais, Abdulla S. (Department of Civil Engineering, University of Tikrit)
  • Received : 2020.01.31
  • Accepted : 2020.05.18
  • Published : 2020.06.25
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Abstract

The current study investigated experimentally the effectiveness of Carbon Fiber Reinforced Polymer (CFRP) in confining concrete cylinders after being subjected to high temperature. Parameters examined were: (a) the exposing temperatures (20, 100, 200, 400 600 and 700℃) and (b) the number of CFRP layers (1 and 3 layers). A uniaxial compressive testing was carried out on 36 concrete cylinders with dimensions of 150 mm×300 mm. The results obtained show that the compressive strength reduced with the increased of temperature compared to that measured at 20℃. In particular, the reduction in the compressive strength was more observed when the temperature exceeded 400℃. Further, the concrete cylinders confined with one and three layers of CFRP significantly increased the compressive strength compared to the counterpart unconfined specimen tested at the same temperature. Also, the average percentages of the increase in the compressive strength were approximately 112% and 158% when applying 1 and 3 layers of CFRP, respectively, compared to the counterpart unstrengthened specimen tested at the same temperature.

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References

  1. Al-Karaghool, H.O. (2013), "Strength and ductility of axially loaded RC short columns confined with CFRP and GFRP wraps", M.Sc Thesis, The American University of Sharjah, United Arab Emirates.
  2. Al-Salloum, Y.A. (2007), "Influence of edge sharpness on the strength of square concrete columns confined with composite laminates", Compos. Part B Eng., 38, 640-650. https://doi.org/10.1016/j.compositesb.2006.06.019.
  3. Al-Salloum, Y.A. (2016), "Effect of elevated temperature environments on the residual axial capacity of RC columns strengthened with different techniques", Constr. Build. Mater., 115, 345-361. https://doi.org/10.1016/j.conbuildmat.2016.04.041.
  4. Al-Salloum, Y.A., Almusallam, T.H., Elsanadedy, H.M. and Iqbal, R.A. (2016), "Effect of elevated temperature environments on the residual axial capacity of RC columns strengthened with different techniques", Constr. Build. Mater., 15, 345-361. https://doi.org/10.1016/j.conbuildmat.2016.04.041.
  5. Antons, U., Hegger, J., Kulas, C. and Raupach, M. (2012), "High-temperature tests on concrete specimens reinforced with alkali-resistant glass rovings under bending loads", Proceedings of the 6th International Conference on FRP Composites in Civil Engineering, Rome, Italy, Jun.
  6. Belouadah, M., Rahmouni, Z.E. and Tebbal, N. (2018), "Effects of glass powder on the characteristics of concrete subjected to high temperatures", Adv Concrete Constr., 6, 311-322. https://doi.org/10.12989/acc.2018.6.3.311.
  7. Benzaid, R., Chikh, N. and Mesbah, H. (2009), "Study of the compressive behavior of short concrete columns confined by fiber reinforced composite", Arab. J. Sci. Eng., 34(1B), 15-26.
  8. Chikh, N., Gahmous, M. and Benzaid, R. (2012), "Structural performance of high strength concrete columns confined with CFRP sheets", Proceedings of the World Congress on Eng. (WCE), III, London, July.
  9. Cleary, D.B., Cassino, C.D., Tortorice, R. and Newell J.A. (2003), "Effect of elevated temperatures on a fiber composite to strengthen concrete columns", J. Reinf. Plast. Compos., 22(10), 881-895. https://doi.org/10.1177/0731684403022010002
  10. Cree, D., Chowdhury, E.U., Green, M.F., Bisby, L.A. and Benichou, N. (2012), "Performance in fire of FRP-strengthened and insulated reinforced concrete columns", Fire Saf. J., 54, 86-95. https://doi.org/10.1016/j.firesaf.2012.08.006.
  11. El-Karmoty, H.Z. (2012), "Thermal protection of reinforced concrete columns strengthened by GFRP laminates (Experimental and Theoretical Study)", HBRC J., 8(2), 115-122. https://doi.org/10.1016/j.hbrcj.2012.09.007.
  12. Elsanadedy, H.M., Al-Salloum, Y.A., Abbas, H. and Alsayed, S.H. (2012), "Prediction of strength parameters of FRP confined concrete", Compos. Part B Eng., 43(2), 228-239. https://doi.org/10.1016/j.compositesb.2011.08.043.
  13. Elsanadedy, H.M., Al-Salloum, Y.A., Alsayed, S.H. and Iqbal, R.A. (2012), "Experimental and numerical investigation of size effects in FRP wrapped concrete columns", Constr. Build. Mater., 29, 56-72. https://doi.org/10.1016/j.conbuildmat.2011.10.025.
  14. Elsanadedy, H.M., Almusallam, T.H., Abbas, H., Al-Salloum, Y.A. and Alsayed S.H. (2011), "Effect of blast loading on CFRP-retrofitted RC columns-A numerical study", Lat. Am. J. Solid. Struct., 8, 55-81. http://dx.doi.org/10.1590/S1679- 8252011000100004.
  15. Gajdosova, K. and Bilcik, J. (2011), "Slender reinforced concrete columns strengthened with fibre reinforced polymers", Slovak J. Civil Eng., 2, 27-31. https://doi.org/10.2478/v10189-011-0010-3.
  16. Georgali, B. and Tsakiridis, P.E. (2005), "Microstructure of fire-damaged concrete. A case study", Cement Concete Compos., 27, 255-259. https://doi.org/10.1016/j.cemconcomp.2004.02.022.
  17. Hashemi, S. and Al-Mahaidi, R. (2012), "Flexural performance of CFRP textile-retrofitted RC beams using cement-based adhesives at high temperature", Constr. Build. Mater., 28(1), 791-799. https://doi.org/10.1016/j.conbuildmat.2011.09.015.
  18. Moshiri, N., Hosseini, A. and Mostofinejad, D. (2015), "Strengthening of RC columns by longitudinal CFRP sheets: effect of strengthening technique", Constr. Build. Mater., 79, 318-325. https://doi.org/10.1016/j.conbuildmat.2015.01.040.
  19. Olivova, K. and Bilcik, J. (2009), "Strengthening of concrete columns with CFRP", Slovak J. Civil Eng., 1, 1-9.
  20. Quiertant, M. and Clement, J.L. (2011), "Behavior of RC columns strengthened with different CFRP systems under eccentric loading", Constr. Build. Mater., 25, 452-460. https://doi.org/10.1016/j.conbuildmat.2010.07.034.
  21. Radnic, J., Markic, R., Harapin, A. and Matesan, D. (2013), "Effect of confined concrete on compressive strength of RC beams", Adv Concrete Constr., 3, 145-162. https://doi.org/10.12989/acc2013.1.3.215.
  22. Raoof, S.M. and Bournas, D.A, (2017), "Bond between TRM versus FRP composites and concrete at high temperatures", Compos. Part B Eng., 27, 150-165. https://doi.org/10.1016/j.compositesb.2017.05.064.
  23. Raoof, S.M. and Bournas, D.A. (2017), "TRM versus FRP in flexural strengthening of RC beams: Behaviour at high temperatures", Constr. Build. Mater., 154, 424-437. https://doi.org/10.1016/j.conbuildmat.2017.07.195.
  24. Saafi, M. and Romine, P. (2002), "Effect of fire on concrete cylinders confined with GFRP", Proceedings of the 2nd International Conference on Durability of Fiber Reinforced Polymer (FRP) Composites for Construction (CDCC'02), Montreal, Canada, June.
  25. Shaikh, F.U.A. and Taweel, M. (2015), "Compressive strength and failure behaviour of fibre reinforced concrete at elevated temperatures", Adv Concrete Constr., 3, 283-293. https://doi.org/10.12989/acc.2015.3.4.283.
  26. Siddiqui, N.A., Alsayed, S.H., Al-Salloum, Y.A., Iqbal, R.A. and Abbas, H. (2014), "Experimental investigation of slender circular RC columns strengthened with FRP composites", Constr. Build. Mater., 69, 323-334. https://doi.org/10.1016/j.conbuildmat.2014.07.053.
  27. Touhari, M. and Kettab, R.M. (2016), "Behaviour of FRP confined concrete cylinders: Experimental investigation and strength model", Proc. Poliec.Civ. Eng., 60(4), 647-660. https://doi.org/10.3311/PPci.8759.
  28. Zhang, B., Cullen, M. and Kilpatrick, T. (2014), "Fracture toughness of high performance concrete subjected to elevated temperatures Part 1 The effects of heating temperatures and testing conditions (Hot and Cold)", Adv Concrete Constr., 2, 145-162. https://doi.org/10.12989/acc.2014.2.2.015.