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Thermal effects on GFRP rebars: experimental study and analytical analysis

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Abstract

The bond mechanism between Glass Fiber Reinforced Polymer (GFRP) bars and concrete is investigated through experimental testing and analytical modeling. This bond depends on several parameters such as temperature. The present paper studies the thermal effect, under high temperature up to 80°C, on bond behaviour at the interface GFRP bars/concrete through pullout-testing. These tests are conducted on specimens after 24 h of exposure at various temperatures. The thermal effect on an average short-term bond strengths and the pullout-load versus end-slip behaviours are compared to untreated specimens (20°C). Some pullout-tests on steel bars/concrete are also performed for the comparison. Experimental results show no significant change in the average bond strength for specimens subjected to temperatures up to +60°C. On the other hand at 80°C, there is a decrease of bond strength of about 22 and 28% for the 8 mm and the 16 mm diameter rods, respectively. An analytical model of the bond stress-slip response of a GFRP/concrete bar has been proposed. The results show good accuracy between the model and the experimental results.

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Acknowledgments

The authors wish to acknowledge the “Schock Bauteil GmbH Combar®” and “Sika Tunisienne” for their help in providing the necessary materials. They also thank Dr. Atef Daoued for his help in the work.

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Authors and Affiliations

  1. Civil Engineering Laboratory, National Engineering School of Tunis (ENIT), BP 37, 1002, Tunis Belvedere, Tunisia

    Abdelmonem Masmoudi & Mongi Ben Ouezdou

  2. Department of Civil Engineering, Faculty of Engineering, Sherbrooke University, 2500, Boul. of Sherbrooke University, Sherbrooke, QC, J1K 2R1, Canada

    Abdelmonem Masmoudi & Radhouane Masmoudi

  3. Department of Civil Engineering, Higher Institute for Technological Study (ISET) Sfax, BP 88-A, 3099, Sfax Boustene, Tunisia

    Abdelmonem Masmoudi

  4. Department of Civil and Environmental Engineering, Engineering and Architecture College, University of Nizwa, PO Box 33, 616 Birkat Al Mouz, Nizwa, Sultanate of Oman

    Mongi Ben Ouezdou

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  1. Abdelmonem Masmoudi
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  2. Radhouane Masmoudi
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  3. Mongi Ben Ouezdou
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Correspondence to Mongi Ben Ouezdou.

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Masmoudi, A., Masmoudi, R. & Ben Ouezdou, M. Thermal effects on GFRP rebars: experimental study and analytical analysis. Mater Struct 43, 775–788 (2010). https://doi.org/10.1617/s11527-009-9547-2

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  • DOI: https://doi.org/10.1617/s11527-009-9547-2

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