Effect of Concrete Composition on FRP/Concrete Bond Capacity
Publication: Journal of Composites for Construction
Volume 11, Issue 6
Abstract
External bonding of fiber-reinforced plastics (FRP) to concrete members has been established as an efficient and effective method for structural strengthening and retrofitting. Direct shear test is often employed to study the crack-induced debonding failure in reinforced concrete members flexurally strengthened with FRP composites. In many existing models, the bond capacity (which defines ultimate load capacity of the specimen in the direct shear test) is considered to be strongly dependent on the compressive or tensile strength of the concrete. However, since debonding behavior is affected by interfacial friction due to aggregate interlocking within the debonded zone, the concrete composition should also play an important role in determining the bond capacity. In this study, the direct shear test is performed with 10 different compositions of concrete. The test results indicate that the bond capacity has little correlation with either the concrete compressive or splitting tensile strength. On the other hand, the bond capacity is found to have reasonable correlation with the concrete surface tensile strength but correlates very well with the aggregate content. As a geometry independent parameter corresponding to bond capacity, the interfacial fracture energy is empirically proposed to relate to these two parameters. The consideration of aggregate content leads to much better agreement between predicted bond capacity and test result. Hence, the effect of concrete composition on the FRP/concrete bond should be considered in practical design.
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Acknowledgments
The writers gratefully acknowledge the financial support provided by the Hong Kong Research Grant Council, under UNSPECIFIEDHKUST6196/01E.
References
Bizindavyi, L., and Neale, K. W. (1999). “Transfer length and bond strengths for composites bonded to concrete.” J. Compos. Constr., 3(4), 153–160.
Chajes, M. J., Finch, W. W., Jr., Januszka, T. F., and Thomson, T. A., Jr. (1996). “Bond and force transfer of composite material plates bonded to concrete.” ACI Struct. J., 93(2), 295–303.
Chen, J. F., and Teng, J. G. (2001). “Anchorage strength models for FRP and steel plates attached to concrete.” J. Struct. Eng., 127(7), 784–791.
De Lorenzis, L., Miller, B., and Nanni, A. (2001). “Bond of fiber-reinforced polymer laminates to concrete.” ACI Mater. J., 98(3), 256–264.
FIB. (2001). “Externally bonded FRP reinforcement for RC structures.” Technical Rep. Bulletin No. 14, International Federation for Structural Concrete, Lausanne, Switzerland.
Holzenkampfer, O. (1994). “Ingenieurmoddelle des Verbundes geklebter Bewehrung fur Betonbauteile.” Dissertation, TU Braunschweig, Germany (in German).
Leung, C. K. Y. (2001). “Delamination failure in concrete beams retrofitted with a bonded plate.” J. Mater. Civ. Eng., 13(2), 106–113.
Leung, C. K. Y., and Tung, W. K. (2006). “Three-parameter model for debonding of FRP plate from concrete substrate.” J. Eng. Mech., 132(5), 509–518.
Maeda, T., Asano, Y., Sata, Y., Ueda, T., and Kakuta, Y. (1997). “A study on bond mechanism of carbon fiber sheet.” Proc., 3rd Int. Symp., Nonmetallic (FRP) Reinforcement for Concrete Structures, Sapporo, Japan, 279–285.
Meier, U., Deuring, M., Meier, H., and Schwegler, G. (1992). “Strengthening of structures with CFRP laminates: Research and applications in Switzerland.” Advanced composite materials in bridges and structures, Canadian Society for Civil Engineering, Sherbrooke, Quebec, Canada, 243–251.
Neubauer, U., and Rostasy, F. S. (1997). “Design aspects of concrete structures strengthened with externally bonded CFRP plates.” Proc., 7th Int. Conf. on Structural Faults and Repairs, M. C. Forde, ed., Engineering Technics Press, Edinburgh, U.K., 109–118.
Niedermeier, R. (1996). “Stellungnahme zur Richtlinie fur das verkleben von Betonbauteilen durch Ankleben von Stahllaschen-Entwurf Marz 1996.” Schreiben Nr. 1390 vom 30.10. des Lehrstuhls fur Massivbau, TU Munchen, Germany (in German).
RILEM Committee FMC 50. (1985). “Determination of the fracture energy of mortar and concrete by means of the three-point bend tests on notched beam.” Mater. Struct., 18(4), 285–290.
Ritchie, P. A., Thomas, D. A., Lu, L. W., and Connelly, G. M. (1991). “External strengthening of concrete beams using fiber-reinforced plastics.” ACI Struct. J., 88, 490–500.
Saadatmanesh, H., and Ehsani, M. R. (1991). “RC beams strengthened with GFRP plates. I: Experimental study.” J. Struct. Eng., 117(11), 3417–3433.
Taljsten, B. (1994). “Plate bonding strengthening of existing concrete structures with epoxy bonded plates of steel or fiber-reinforced plastics.” Doctoral thesis, Lulea Univ. of Technology, Lulea, Switzerland.
Taljsten, B. (1996). “Strengthening of concrete prisms using the plate bonding technique.” Int. J. Fract., 82, 253–266.
Taljsten, B. (1997). “Strengthening of beams by plate bonding.” J. Mater. Civ. Eng., 9(4), 206–212.
Tanaka, T. (1996). “Shear resisting mechanism of reinforced concrete beams with CFS as shear reinforcement.” Graduate’s thesis, Hokkaido Univ., Hokkaido, Japan.
Van Gemert, D. (1980). “Force transfer in epoxy-bonded steel-concrete joints.” Int. J. Adhes. Adhes., 1(1), 67–72.
Yao, J., Teng, J. G., and Chen, J. F. (2005). “Experimental study on FRP-to-concrete bonded joints.” Composites, Part B, 36(2), 99–113.
Yuan, H., Wu, Z. S., and Yoshizawa, H. (2001). “Theoretical solutions on interfacial stress transfer of externally bonded steel/composite laminates.” J. Struct. Mech. Earthquake Eng., 675(1–55), 27–39.
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© 2007 ASCE.
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Received: Mar 28, 2006
Accepted: Jan 30, 2007
Published online: Dec 1, 2007
Published in print: Dec 2007
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