Bond Strength of Fiber Reinforced Polymer Rebars in Normal Strength Concrete
Publication: Journal of Composites for Construction
Volume 9, Issue 3
Abstract
The bond behavior of reinforcing bars in concrete is a critical issue in the design of reinforced concrete structures. This study focuses on the bond strength of fiber reinforced polymer (FRP) rebars in normal strength concrete. Four different types of rebars were tested using the pullout method: aramid FRP (AFRP); carbon FRP (CFRP); glass FRP (GFRP), and steel. This involved a total of 151 specimens containing 6, 8, 10, 16, and rebars embedded in a concrete cube. The test embedment lengths were five, seven, and nine times the rebar diameter . For each rebar, the test results include the bond stress–slip response and the mode of failure. The test results showed that the bond strength of an FRP rebar is, on average, 40–100% the bond strength on a steel rebar for pullout failure mode. Based on this research, a proposal for the average bond strength of straight FRP rebars in normal strength concrete is made, which verifies an existing bond strength relationship (GFRP) and extends its application to AFRP and CFRP. It is an expression that is a function of the rebar diameter, and the concrete compressive strength.
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Acknowledgments
The writers wish to acknowledge the following for their corporation and support in form of material donations, and financial resource: Doug Gremel of Hughes Brothers; Sireg Spa; Marshall Industries Composites; Eurocrete; Pultrall; Re-bars Chili, and Tim Bradberry of The Texas Department of Transportation (TxDOT), Austin.
References
Benmokrane, B., Tighiouart, B., and Chaallal, O. (1996). “Bond strength and load distribution of composite GFRP reinforcing bars in concrete.” ACI Mater. J., 93(3), 246–253.
Brown, V. L., and Bartholomew, C. L. (1993). “FRP reinforcing bars in reinforced concrete members.” ACI Mater. J., 90(1), 34–39.
De Lorenzis, L., and Nanni, A. (2001). “Characterization of FRP rods as near-surface mounted reinforcement.” J. Compos. Constr., 5(2), 14–21.
De Lorenzis, L., and Nanni, A. (2002). “Bond between near-surface mounted fiber-reinforced polymer rods and concrete in structural strengthening.” ACI Struct. J., 99(2), 123–132.
Ehsani, M. R., Saadatmanesh, H., and Tao, S. (1995). “Bond of hooked glass fiber reinforced plastic (GFRP) reinforcing bars to concrete.” ACI Mater. J., 92(4), 391–400.
Ehsani, M. R., Saadatmanesh, H., and Tao, S. (1996). “Design recommendations for bond of GFRP rebars to concrete.” J. Struct. Eng., 122(3), 247–254.
Focacci, F., Nanni, A., and Bakis, C. E. (2000). “Local bond–slip relationship for FRP reinforcement in concrete.” J. Compos. Constr., 4(1), 24–31.
Katz, A. (2000). “Bond to concrete of FRP rebars after cyclic loading.” J. Compos. Constr., 4(3), 137–144.
Kessler, R. J., and Powers, R. G. (1998). “Corrosion of epoxy-coated rebars—Keys segmental bridge—Monroe County.” Rep. No. 88-8A, Florida Department of Transportation, Materials Office, Corrosion Research Laboratory, Gainesville, Fla.
Larralde, J., and Silva-Rodriguez, R. (1993). “Bond and slip of FRP rebars in concrete.” J. Mater. Civ. Eng., 5(1), 30–40.
Malvar, L. J. (1995). “Tensile and bond properties of GFRP reinforcing bars.” ACI Mater. J., 92(3), 276–285.
Okelo, R. (2002). “Development and splice lengths criteria for straight fiber reinforced polymer composite bars in tension.” PhD dissertation, The Univ. of Texas at Arlington, Arlington, Tex.
Pecce, M., Manfredi, G., Realfonzo, R., and Cosenza, E. (2001). “Experimental and analytical evaluation of bond properties of GFRP bars.” J. Mater. Civ. Eng., 13(4), 282–290.
Yuan, R. L., and Okelo, R. (2001). “Round robin tests on the bond strength of FRP reinforcement.” Technical Rep. for the Texas Dept. of Transportation (TxDOT), Austin, Civil Engineering Dept., The Univ. of Texas at Arlington, Arlington, Tex.
Zhang, B., and Benmokrane, B. (2000). “Prediction of tensile capacity of bond anchorages for FRP tendons.” J. Compos. Constr., 4(2), 39–47.
Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 9 • Issue 3 • June 2005
Pages: 203 - 213
Copyright
© 2005 ASCE.
History
Received: Aug 26, 2002
Accepted: Jun 5, 2003
Published online: Jun 1, 2005
Published in print: Jun 2005
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