Transverse Thermal Expansion of FRP Bars Embedded in Concrete
Publication: Journal of Composites for Construction
Volume 9, Issue 5
Abstract
Fiber reinforced polymers (FRPs) have a thermal expansion in the transverse direction much higher than in the longitudinal direction and also higher than the thermal expansion of hardened concrete. The difference between the transverse coefficient of thermal expansion of FRP bars and concrete may cause splitting cracks within the concrete under temperature increase and, ultimately, failure of the concrete cover if the confining action of concrete is insufficient. This paper presents the results of an experimental investigation to analyze the effect of the ratio of concrete cover thickness to FRP bar diameter on the strain distributions in concrete and FRP bars, using concrete cylindrical specimens reinforced with a glass FRP bar and subjected to thermal loading from . The experimental results show that the transverse coefficient of thermal expansion of the glass FRP bars tested in this study is found to be equal to 33 , on average and the ratio between the transverse and longitudinal coefficients of thermal expansion of these FRP bars is equal to 4. Also, the cracks induced by high temperature start to develop on the surface of concrete cylinders at a temperature varying between and for specimens having a ratio of concrete cover thickness to bar diameter less than or equal to 1.5. A ratio of concrete cover thickness to glass fiber reinforced polymers (GFRP) bar diameter greater than or equal to 2.0 is sufficient to avoid cracking of concrete under high temperature up to . The analytical model, presented in this paper, is in good agreement with the experimental results, particularly for negative temperature variations.
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Acknowledgments
The research reported in this paper was sponsored by the Natural Sciences and Engineering Research Council of Canada and by the “Fonds Québécois de la recherche sur la nature et les technologies.” The opinion and analysis presented in this paper are those of the writers. Special thanks to F. Ntacorigira to his contribution for the fabrication and instrumentation of test specimens.
References
Abdalla, H. A., and Elbadry, M. M. (1997). “Temperature effects on concrete members reinforced with FRP reinforcement.” Proc., Annual Conf.—Canadian Society for Civil Engineering, Vol. 6, Structures-Composite Materials, Structural Systems, Telecommunication Towers, Sherbrooke, Quebec, 171–180.
Agarwal, B. D., and Broutman, L. J. (1990). Analysis and performance of fiber composites, 2nd Ed., Wiley, New York.
Aiello, M. A. (1999). “Concrete cover failure in FRP reinforced beams under thermal loading.” J. Compos. Constr., 3(1), 46–52.
Aiello, M. A., Focacci, F., Huang, P. C., and Nanni, A. (1999). “Cracking of concrete cover in FRP reinforced concrete elements under thermal loads.” Proc., 4th Int. Symp. on FRP for Reinforced Concrete Structures (FRPRCS4), Baltimore, 233–243.
Aiello, M. A., Focacci, F., and Nanni, A. (2001). “Effects of thermal loads on concrete cover of fiber reinforced polymer reinforced elements: Theoretical and experimental analysis.” ACI Mater. J., 98(4), 332–339.
American Concrete Institute (ACI). (2003). “Guide for the design and construction of concrete with FRP bars.” 440.1R-03, Detroit.
American Society of Testing and Materials (ASTM). (2002a). “Standard test method for compressive strength of cylindrical concrete specimens.” Annual Book of ASTM Standards ASTM C 39/C 39M-0, Vol. 04.2, ASTM International, Philadelphia, 21–25.
American Society for Testing and Materials (ASTM). (2002b). “Standard test method for splitting tensile strength of cylindrical concrete specimens.” Annual Book of ASTM Standards ASTM C 496-96, Vol. 04.2, ASTM International, Philadelphia, 281–284.
Bank, L. C. (1993). “Properties of FRP reinforcement for concrete, fiber-reinforced-plastic (FRP) reinforcement for concrete structures: Properties and applications.” Developments in civil engineering, A. Nanni, ed., Vol. 42, Elsevier, Amsterdam, The Netherlands, 59–86.
Benmokrane, B., and El-Salakawy, E., eds. (2002). Proc., 2nd Int. Conf. on the Durability of Composites for Construction, CDCC’02, Univ. of Sherbrooke, Montreal.
Canadian Standards Association (CSA). (2000). “Canadian highway bridge design code.” CAN/CSA-S6-00, Toronto.
Canadian Standards Association (CSA). (2002). “Design and construction of building components with fiber-reinforced polymers.” CAN/CSA-806-02, Toronto.
Chaallal, O., and Benmokrane, B. (1993). “Physical and mechanical performance of innovative glass fiber reinforced plastic rod for concrete and grouted anchorages.” Can. J. Civ. Eng., 20(2), 254–268.
Daniel, I. M., and Ishai, O. (1994). Engineering mechanics of composite materials, Oxford University Press, Oxford, U.K.
Elbadry, M. M., and Abdalla, H. (1998). “Experimental studies on thermal cracking in concrete members reinforced with FRP.” Proc., 1st Int. Conf. on Durability of Fibre Reinforced Polymer Composites for Construction, CDCC98, Univ. of Sherbrooke, Sherbrooke, Quebec, 669–680.
Elbadry, M. M., Abdalla, H., and Ghali, A. (2000). “Effects of temperature on the behavior of fiber reinforced polymer reinforced concrete members: Experimental studies.” Can. J. Civ. Eng., 27(5), 993–1004.
Elbadry, M., and Dunaszegi, L., eds. (2004). Proc. 4th Int. Conf. on Advanced Composite Materials in Bridges and Structures, ACMBS IV, Canadian Society of Civil Engineering (CDCE), Calgary, Canada.
Erki, M. A., and Rizkalla, S. H. (1993). “FRP reinforcement for concrete structures.” Concr. Int., 15(6), 48–53.
Gentry, T. R., and Hudak, C. E. (1996). “Thermal compatibility of plastic composite reinforcement and concrete.” Proc., 2nd Int. Conf. on Advanced Composite Materials in Bridges and Structures, ACMBS-II, Montreal, 149–156.
Gentry, T. R., and Husain, M. (1999). “Thermal compatibility of concrete and composite reinforcements.” J. Compos. Constr., 3(2), 82–86.
Humar, J., and Razaqpur, G., eds. (2000). Proc., 3rd Int. Conf. on Advanced Composite Materials in Bridges and Structures, ACMBS IV, Canadian Society of Civil Engineering (CDCE), Ottawa, Canada.
Intelligent Sensing for Innovative Structures (ISIS). Canada Research Network (2001). “Reinforcing concrete structures with FRP.” Design Manuals, Vol. 3, Winnipeg, Manitoba, Canada.
Matthy, S., De Shutter, G., and Taerwe, L. (1996). “Influence of transverse thermal expansion of FRP reinforcement on the critical concrete cover.” Proc., 2nd Int. Conf. on Advanced Composite Materials in Bridges and Structures, ACMBS-II, Montreal, 665–672.
Measurements Group, Inc. (1993). “Strain gage thermal output and gage factor variation with temperature.” Technical Rep. No. TN-504-1.
Mitsubishi Chemical Corporation. (1995). “Leadline carbon fiber reinforced plastic rod.” Technical Data, Japan.
Powell, A. E. (2001). “Rebuilding America’s infrastructure.” Civ. Eng. (N.Y.), 71(9), 33.
Rahman, H. A., Kingsley, C. Y., and Taylor, D. A. (1995). “Thermal stress in FRP reinforced concrete.” Proc., Ann. Conf. of the Canadian Society for Civil Engineering, CSCE, Ottawa, 605–614.
Tan, K.-H., ed. (2003). Proc., 6th Int. Symp. on Fibre Reinforced Polymer Reinforcement for Concrete Structure (FRPRCS-6), Vols. 1 and 2, National Univ. of Singapore, World Scientific, Singapore.
Timoshenko, S. P., and Goodier, J. N. (1970). Theory of elasticity, McGraw-Hill, New York.
Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 9 • Issue 5 • October 2005
Pages: 377 - 387
Copyright
© 2005 ASCE.
History
Received: Jul 15, 2004
Accepted: Feb 3, 2005
Published online: Oct 1, 2005
Published in print: Oct 2005
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