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http://dx.doi.org/10.4334/JKCI.2013.25.1.045

Critical Temperature for Inter-Laminar Shear Strength and Effect of Exposure Time of FRP Rebars  

Moon, Do-Young (Dept. of Civil Engineering, Kyungsung University)
Publication Information
Journal of the Korea Concrete Institute / v.25, no.1, 2013 , pp. 45-51 More about this Journal
Abstract
Short beam tests of GFRP and CFRP specimens exposed to high temperature were conducted to measure the inter-laminar shear strength. For the phase I test, the exposure time and temperature were varied to measure reduction in the strength due to the applied conditions. As a results, the critical temperature was found to $270^{\circ}C$ for the both FRP reinforcements. The high temperature, which causes 50% loss of inter-laminar shear strength, is defined as the critical temperature in this study. It should be noted that the critical temperature for the inter-laminar shear strength is mainly dependent on resin properties not on fiber type. In the phase II test, the effect of exposure time was investigated at intervals of 0.25hour for the critical temperature. All test results demonstrate that the exposure time effect is not significant compared to the maximum exposure temperature, but it is not negligible and, moreover, is significant at the critical temperature.
Keywords
critical temperature; exposure time; inter-laminar shear strength; GFRP; CFRP;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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1 Saafi, M., "Effect of Fire on FRP Reinforced Concrete Members," Composite Structures, Vol. 58, Issue 1, 2002, pp. 11-20. (doi: http://dx.doi.org/10.1016/S0263-8223(02)00045-4)   DOI   ScienceOn
2 Bisby, L. A. and Kodur, V. K. R., "Evaluating The Fire Endurance of Concrete Slabs Reinforced with FRP Bar: Considerations for a Holistic Approach," Composites: Part B, Vol. 38, No. 5-6, 2007, pp. 547-558. (doi: http://dx.doi.org/10.1016/j.compositesb.2006.07.013)   DOI   ScienceOn
3 Robert, M. and Benmokrane, B., "Behavior of GFRP Reinforcing Bars Subjected to Extreme Temperature," Journal of Composites for Construction, ASCE, Vol. 14, No. 4, 2010, pp. 353-360. (doi: http://dx.doi.org/10.1061/(ASCE)CC.1943-5614.0000092)   DOI   ScienceOn
4 Moon, D. Y. and Oh, H. S., "The Combined Effect of Concrete Environment and High Temperature on Interlaminar Shear Strength of FRP Reinforcement," Journal of the Korea Concrete Institute, Vol. 23, No. 6, 2011, pp. 749-756.   과학기술학회마을   DOI   ScienceOn
5 Oh, H. S. and Moon, D. Y., "A Degradation Characteristic of FRP Rebars Attacked by Combined Environmental Factors," Journal of the Korea Institute for Structural Maintenance Inspection, Vol. 16, No. 3, pp. 1-10.
6 Ai-Zaherani, M. M., Al-Dulaijan, S. U., Al-Idi, S. H., and Ai-Mehthel, M. H., "High Temperature Effect on Tensile Strength of GFRP Bars and Flexural Behavior of GFRP Reinforced Concrete Beams," FRPRCS-8, Patras, Greece, 2007.
7 Moon, D. Y., "Simplified Evaluation Method for Residual Bond Strength of Reinforced Concrete Using Standard Fire Curve," Journal of Korean Society of Hazard Mitigation, Vol. 10, No. 5, 2010, pp. 41-47.   과학기술학회마을
8 ASTM D 4475-2, Standard Test Method for Apparent Horizontal Shear Strength of Pultruded Reinforced Plastic Rods by the Short-Beam Method, ASTM International, PA, 2008, pp. 1-4.
9 Wang, Y. C. and Kodur, V. K. R., "Variation of Strength and Stiffness of Fibre Reinforced Polymer Reinforcing Bars with Temperature," Cement and Concrete Composites, Vol. 27, Issues 9-10, 2005, pp. 864-874. (doi: http://dx. doi.org/10.1016/j.cemconcomp.2005.03.012)   DOI   ScienceOn
10 Blontrock, H., Taerwe, L., and Matthys, S., "Properties of Fiber Reinforced Plastics at Elevated Temperatures with Regards to Fire Resistance of Reinforced Concrete Members," In: Fourth International Symposium on Non-Metallic (FRP) Reinforcement for Concrete Structures, Baltimore, American Concrete Institute, 1999, pp. 43-54.