Durability of Concrete Beams Externally Reinforced with CFRP Composites Exposed to Various Environments
Publication: Journal of Composites for Construction
Volume 16, Issue 1
Abstract
In this paper, the effects of various environmental exposure conditions on concrete beams externally reinforced with carbon-fiber-reinforced polymer (CFRP) composites were studied. To evaluate the overall environmental effects on the durability of the interfacial bonding between concrete and CFRP, different commercial composite systems were investigated under various exposure conditions by using a new test method suggested previously. Results showed that the flexural strength of the beam specimens was reduced with environmental exposure. The commercial systems showed significant differences in the relative strength loss, although they were all intended for the same application, suggesting that durability is highly dependent on the epoxy system used in the composite. Under exposure to water and other fluids with different temperatures, CFRP systems employing wet lay-up composites showed high durability with the exception that one system revealed a considerable loss in strength with elevated temperature and time. A system using a precured laminate exhibited a large reduction in strength with exposure. Exposure to brackish water caused an increase in the flexural strength by virtue of buildup of barnacles, which protected the specimens from deterioration and increased the strength by acting as an additional reinforcement.
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Acknowledgments
This work is supported by the National Cooperative Highway Research Program under project 12-73.
References
Aiello, M. A., Frigione, M., and Acierno, D. (2002). “Effects of environmental conditions on performance of polymeric adhesives for restoration of concrete structures” J. Mater. Civ. Eng. JMCEE7, 14(2), 185–189.
American Concrete Institute (ACI). (2004). “Guide test methods for fiber-reinforced polymers (FRPs) for reinforcing or strengthening concrete structures.” 440.3R-04, Farmington Hills, MI.
ASTM. (2002). “Standard test method for flexural strength of concrete (using simple beam with third-point loading).” C78-02, West Conshohocken, PA.
ASTM. (2005). “Standard test method for bond strength of epoxy-resin systems used with concrete by slant shear.” C882, West Conshohocken, PA.
ASTM. (2010). “Standard test method for tensile properties of plastics.” D638, West Conshohocken, PA.
ASTM. (2011). “Standard test method for compressive strength of cylindrical concrete specimens.” C39, West Conshohocken, PA.
Au, C., and Buyukozturk, O. (2006). “Peel and shear fracture characterization of debonding in FRP plated concrete affected by moisture.” J. Compos. Constr. JCCOF2, 10(1), 35–47.
Chajes, M. J., Thomson, T. A., and Farschman, C. A. (1995). “Durability of concrete beams externally reinforced with composite fabrics.” Constr. Build. Mater. CBUMEZ, 9(3), 141–148.
Choi, S., and Douglas, E. P. (2010). “Complex hygrothermal effects on the glass transition of an epoxy-amine thermoset.” ACS Appl. Mater. Interfaces AAMICK, 2(3), 934–941.
DeBruyne, N. A. (1956). “The adhesive properties of epoxy resins.” J. Appl. Chem. JACHAU, 6(7), 303–310.
Djouani, F., Connan, C., Chehimia, M. M., and Benzartib, K. (2008). “Interfacial chemistry of epoxy adhesives on hydrated cement paste.” Surf. Interface Anal. SIANDQ, 40(3–4), 146–150.
El-Hawary, M., Al-Khaiat, H., and Fereig, S. (1998). “Effect of sea water on epoxy-repaired concrete.” Cem. Concr. Compos. CCOCEG, 20(1), 41–52.
El-Hawary, M., Al-Khaiat, H., and Fereig, S. (2000). “Performance of epoxy-repaired concrete in a marine environment.” Cem. Concr. Res. CCNRAI, 30(2), 259–266.
Gartner, A., Douglas, E. P., Dolan, C. W., and Hamilton, H. R. (2011). “Small beam bond test method for CFRP composites applied to concrete.” J. Compos. Constr. JCCOF2, 15(1), 52–61.
Grace, N. F. (2004). “Concrete repair with CFRP.” Concr. Int. CNCIEH, 26(5), 45–52.
Karbhari, V. M., et al. (2003). “Durability gap analysis for fiber-reinforced polymer composites in civil infrastructure.” J. Compos. Constr. JCCOF2, 7(3), 238–247.
Karbhari, V. M., and Engineer, M. (1996). “Effect of environmental exposure on the external strengthening of concrete with composites—Short term bond durability.” J. Reinf. Plast. Compos. JRPCDW, 15(12), 1194–1216.
Karbhari, V. M., Engineer, M., and Eckel, D. A. (1997). “On the durability of composite rehabilitation schemes for concrete: Use of a peel test.” J. Mater. Sci. JMTSAS, 32(1), 147–156.
Lefebvre, D. R., Takahashi, K. M., Muller, A. J., and Raju, V. R. (1991). “Degradation of epoxy coatings in humid environments—The critical relative-humidity for adhesion loss.” J. Adhes. Sci. Technol. JATEE8, 5(3), 201–227.
Liau, W. B., and Tsent, F. P. (1998). “The effect of long-term ultraviolet light irradiation on polymer matrix composites.” Polym. Compos. PCOMDI, 19(4), 440–445.
Merlin, F., Guitouni, H., Mouhoubi, H., Mariot, S., Vallee, F., and Van Damme, H. (2005). “Adsorption and heterocoagulation of nonionic surfactants and latex particles on cement hydrates.” J. Colloid Interface Sci. JCISA5, 281(1), 1–10.
Nogueira, P., et al. (2001). “Effect of water sorption on the structure and mechanical properties of an epoxy resin system.” J. Appl. Polym. Sci. JAPNAB, 80(1), 71–80.
Qiao, P. Z., Asce, M., and Xu, Y. W. (2004). “Evaluation of fracture energy of composite-concrete bonded interfaces using three-point bending.” J. Compos. Constr. JCCOF2, 8(4), 352–359.
Schmidt, R. G., and Bell, J. P. (1986). “Epoxy adhesion to metals.” Adv. Polym. Sci. APSIDK, 75, 33–71.
Sen, R., Shahawy, M., Mullins, G., and Spain, J. (1999). “Durability of carbon fiber-reinforced polymer/epoxy/concrete bond in marine environment.” ACI Struct. J. ASTJEG, 96, 906–914.
Silva, M. A. G., and Biscaia, H. (2008). “Degradation of bond between FRP and RC beams.” Compos. Struct. COMSE2, 85(2), 164–174.
Toutanji, H. A., and Gomez, W. (1997). “Durability characteristics of concrete beams externally bonded with FRP composite sheets.” Cem. Concr. Compos. CCOCEG, 19(4), 351–358.
Tu, L., and Kruger, D. (1996). “Engineering properties of epoxy resins used as concrete adhesives.” ACI Struct. J. ASTJEG, 93, 26–35.
Wan, B. L., Petrou, M. F., and Harries, K. A. (2006). “The effect of the presence of water on the durability of bond between CFRP and concrete.” J. Reinf. Plast. Compos. JRPCDW, 25(8), 875–890.
Wu, L., Hoa, S. V., and Thon-That, M.-T. (2004). “Effect of water on the curing and properties of epoxy adhesive used for bonding FRP composite sheet to concrete.” J. Appl. Polym. Sci. JAPNAB, 92(4), 2261–2268.
Wu, L., Hoa, S. V., and Thon-That, M.-T. (2006). “Effects of composition of hardener on the curing and aging for an epoxy resin system.” J. Appl. Polym. Sci. JAPNAB, 99(2), 580–588.
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© 2012. American Society of Civil Engineers.
History
Received: Mar 29, 2010
Accepted: Jun 13, 2011
Published in print: Feb 1, 2012
Published online: Apr 27, 2012
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