Transfer Lengths and Bond Strengths for Composites Bonded to Concrete
Publication: Journal of Composites for Construction
Volume 3, Issue 4
Abstract
An effective method for strengthening existing concrete beams in bending consists in bonding fiber-reinforced composite laminates on the tension faces of the beams. Laboratory tests on beam specimens show, however, that it is often difficult to develop the full composite strength capacity because of premature failure due to delamination and peeling-off of the laminate. Conditions at the interface between the composite and concrete are not yet fully understood, and studies are required to determine the development lengths needed to achieve the composite's strength capacity. In this paper, we report results of an experimental and theoretical investigation of composite-to-concrete bonded joints. We first present a new and fairly simple experimental apparatus designed and constructed in our laboratory. With this test rig it is possible to investigate the shear conditions between the composite and concrete, to determine the stress and strain distribution profiles in a composite laminate that is bonded to the concrete, and to make direct measurements of the bond strengths. A brief description of the apparatus is given and experimental results are presented. A theoretical analysis for the behavior of such composite-to-concrete bonded joints has also been developed. Predictions of the numerical model are compared to the experimental results.
Get full access to this article
View all available purchase options and get full access to this article.
References
1.
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.
2.
Chajes, M. J., Januszka, T. F., Mertz, D. R., Thomson, T. A. Jr., and Finch, W. W. (1995). “Shear strengthening of reinforced concrete beams using externally applied composite fabrics.” ACI Struct. J., 92(3), 295–303.
3.
Hull, D., and Clyne, T. W. (1996). An introduction to composite materials, 2nd Ed., Cambridge University Press, Cambridge, U.K.
4.
Jones, R., Swamy, R. N., Bloxham, J., and Bouderbalah, A. (1980). “Composite behavior of concrete beams with epoxy bonded external reinforcement.” Int. J. Cement Composites, 2(2), 91–107.
5.
Kazuaki, N., Atsushi, Y., and Hiroyiki, H. (1996). “Numerical approach for evaluation of stress transmissibility of composite interface.” Design and manufacturing of composites, Proc., Joint Canada-Japan Workshop on Composites, S. V. Hoa and H. Hamada, eds., Technomic, Lancaster, Pa., 183–186.
6.
Kobatake, Y., Kimura, K., and Katsumada, H. ( 1993). “A retrofitting method for reinforced concrete structures using carbon fiber.” Fiber reinforced plastic (FRP) reinforcement for concrete structures: Properties and applications, A. Nanni, ed., Elsevier Science, Oxford, U.K., 435–450.
7.
Maeda, T., Asano, Y., Sato, Y., Ueda, T., and Kakuta, Y. (1997). “A study on bond mechanism of carbon fiber sheet.” Non-metallic (FRP) reinforcement for concrete structures, Proc., 3rd Int. Symp. (FRPRCS-3), Japan Concrete Institute, Sapporo, Japan, 1, 279–286.
8.
Malek, A. M., Saadatmanesh, H., and Ehsani, M. R. ( 1996). “Shear and normal stress concentrations in RC beams strengthened with FRP plates.” Advanced composite materials in bridges and structures, M. El-Badry, ed., Canadian Society for Civil Engineering, Montreal, Que., 629–637.
9.
Neubauer, U., and Rostasy, F. S. (1997). “Design aspects of concrete structures strengthened with externally bonded CFRP plates.” Proc., 7th Int. Conf. on Struct. Faults and Repair, ECS Publications, Edinburgh, U.K., 2, 109–118.
10.
Oehlers, D. J., and Moran, J. P. (1990). “Premature failure of externally plated reinforced concrete beams.”J. Struct. Engrg., 116(4), 978–995.
11.
Quantrill, R. J., Hollaway, L. C., and Thorne, A. M. (1996a). “Experimental and analytical investigation of FRP strengthened beam response: Part I.” Mag. Concrete Res., 48(177), 331–342.
12.
Quantrill, R. J., Hollaway, L. C., and Thorne, A. M. (1996b). “Prediction of the maximum plate end stresses of FRP strengthened beams: Part II.” Mag. Concrete Res., 48(177), 343–351.
13.
Ranisch, E.-H., and Rostasy, F. S. ( 1986). “Bonded steel plates for the reduction of fatigue stresses of coupled tendons in multispan bridges.” Adhesion between polymers and concrete, H. R. Sasse, ed., RILEM, Paris, 561–570.
14.
Swamy, R. N., Jones, R., and Charif, A. ( 1986). “Shear adhesion properties of epoxy resin adhesives.” Adhesion between polymers and concrete, H. R. Sasse, ed., RILEM, Paris, 741–755.
15.
Theillout, J.-N. ( 1983). “Renforcement et réparation des ouvrages d'art par la technique des toles collées,” PhD thesis, Ecole Nationale des Ponts et Chaussées, Paris (in French).
16.
Triantafillou, T. C., and Plevris, N. (1992). “Strengthening of RC beams with epoxy-bonded fiber-composite materials.” Mat. and Struct., 25, 201–211.
17.
Van Gemert, D.-A. (1980). “Repairing of concrete structures by externally bonded steel plates.” Int. J. of Adhesion, 2, 67–72.
18.
Ziraba, Y. N., Baluch, M. H., Basunbul, I. A., Azad, A. K., Al-Sulaimani, G. F., and Sharif, A. M. (1995). “Combined experimental-numerical approach to the characterization of the steel-glue-concrete interface.” Mat. and Struct., 28, 518–525.
Information & Authors
Information
Published In
History
Received: Jun 12, 1998
Published online: Nov 1, 1999
Published in print: Nov 1999
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.