Effect of High Temperature on Bond Strength of FRP Rebars
Publication: Journal of Composites for Construction
Volume 3, Issue 2
Abstract
The bond properties of fiber reinforced polymer (FRP) reinforcing bars (rebars) at temperatures ranging from room temperature (20°C) to high temperatures of up to 250°C are discussed in this paper. The bond properties in this temperature range were studied for a number of commercially produced rebars, where different bond “treatments” were applied to FRP rebars. Test results showed a reduction of between 80 and 90% in the bond strength as the temperature increased from 20 to 250°C. In comparison, ordinary deformed steel rebars showed a reduction of only 38% in the same temperature range. In addition, a reduction in the bond stiffness, which was determined from the slope of the ascending branch of the pullout load versus slip curve, was seen as the temperature increased. At elevated temperatures the postpeak bond decrease was gradual as compared with the instantaneous drop at room temperature. Greater sensitivity to high temperatures was seen in FRP rebars, in which the bond relies mainly on the polymer treatment at the surface of the rod.
Get full access to this article
View all available purchase options and get full access to this article.
References
1.
Bank, L. C., Puterman, M., and Katz, A. ( 1998). “The effect of material degradation on bond properties of FRP reinforcing bars in concrete.” ACI Mat. J., 95(3), 232–243.
2.
“Bond test reinforcing steel—2. Pull-out test.” (1978). RILEM/CEB/FIP Recommendation RC6 RILEM/CEB/FIP, Paris.
3.
Diederichs, U., and Schneidwe, U. ( 1977). “Untersuchung des Verbundverhaltens und der Verbund-Festigkeit von Rippenstraben und Glatten Rundstaber bei Hohen Temperaturen.” Institute Fur Baustoffkundeund Stahlbetonbau, Braunschweig, Germany (in German).
4.
Dostal, C. A., ed. ( 1987). Engineering materials handbook, Vol. 1: Composites. ASM International, Materials Park, Ohio.
5.
Fried, J. R. ( 1995). Polymer science and technology. Prentice-Hall, Englewood Cliffs, N.J., 167–169.
6.
Fujisaki, T., Nakatsuji, T., and Sugita, M. ( 1993). “Research and development of grid shaped FRP reinforcement.” Proc., Fiber-Reinforced-Plastic Reinforcement for Concrete Struct., A. Nanni and C. W. Dolan, eds., American Concrete Institute, Detroit, 177–192.
7.
Gentry, T. R., Bank, L. C., Barkatt, A., and Prian, L. ( 1998). “Accelerated test methods to determine the long-term behavior of composite highway structures subject to environmental loading.” ASTM J. of Composites Technol. and Res., 20(1), 38–50.
8.
Greszczuk, L. B. ( 1969). “Theoretical studies on the mechanics of the fiber-matrix interface in composites.” Interfaces in Composites, ASTM STP 452, ASTM, West Conshohocken, Pa., 42–58.
9.
Kumahara, S., Masuda, Y., and Tanano, Y. ( 1993). “Tensile strength of continuous fiber bar under high temperature.” Proc., Fiber-Reinforced-Plastic Reinforcement for Concrete Struct., A. Nanni and C. W. Dolan, eds., American Concrete Institute, Detroit, 731–742.
10.
Malhotra, L. ( 1982). Design of fire-resistance structures. Surrey University Press, London, 48–77.
11.
Okamoto, T., Matsubara, S., Tanigaki, M., and Hasuo, K. ( 1993). “Practical application and performance of PPC beams reinforced with braided FRP bars.” Proc., Fiber-Reinforced-Plastic Reinforcement for Concrete Struct., A. Nanni and C. W. Dolan, eds., American Concrete Institute, Detroit, 875–894.
12.
Prian, L., et al. ( 1997). “Use of thermogravimetric analysis to develop accelerated test methods to investigate long-term environmental effects on polymer composites.” High temperature and environmental effects on polymeric composites, T. S. Gates and A. Zureick, eds., Vol. 2, ASTM STP 1302, ASTM, West Conshohocken, Pa., 206–222.
13.
Wang, N., and Evans, J. T. ( 1995). “Collapse of continuous fiber composite beam at elevated temperatures.” Composites, 26(1), 56–61.
14.
Wolff, R., and Miesseler, H. J. ( 1993). “Glass fiber prestressing system.” Alternative materials for the reinforcement and prestressing of concrete, J. L. Clarke, ed., Chapman & Hall, London, 34–54, 131–132.
15.
Yamaski, Y., Masuda, Y., Tanano, H., and Shimizu, A. ( 1993). “Fundamental properties of continuous fiber bars.” Proc., Fiber Reinforced Plastic Reinforcement for Concrete Struct., A. Nanni and C. W. Dolan, eds., American Concrete Institute, Detroit, 715–730.
Information & Authors
Information
Published In
History
Published online: May 1, 1999
Published in print: May 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.