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Abstract

Hybrid fiber-reinforced polymer (FRP) rebar has emerged as one of the most promising and affordable solutions to the brittle failure problems of ordinary FRP rebar in concrete structures. Hybrid FRP rebar stress-strain curves are linearly elastic, and contain a definite yield point followed by plastic deformation.

In this study, the long-term durability performance of hybrid FRP rebar is evaluated. The mechanical properties and durability of one type of carbon FRP rebar, one type of glass FRP rebar, and two types of hybrid FRP rebars are investigated. The rebar specimens are exposed to twelve different environments, including an alkaline solution, an acid solution, a salt solution, deionized water, and repeated freezing and thawing. Short-beam, tensile, and bond tests are used to analyze the mechanical properties and durability of the rebar. The experimental results confirm the desirable resistance of hybrid FRP rebar to aggressive environments.

Keywords

CFRP rebar durability GFRP rebar hybrid FRP rebar

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References

Nanni, A. and Micelli, F. (2001). Mechanical Properties and Durability of FRP Rods, CIES 00-22, Department of Civil Engineering, University of Missouri-Rolla, MO .

Nanni, A. (ed.) (1993). Fiber-Reinforced-Plastic (FRP) Reinforcement for Concrete Structures: Properties and Applications, In: Developments in Civil Engineering, Vol. 42, pp. 3-58, Elsevier, Amsterdam, The Netherlands .

Aveston, J. and Kelly, A. (1980). Tensile First Cracking Strain and Strength of Hybrid Composite and Laminates , Phil. Trans. Roy. Soc. London A, 294: 519-534 .

Ssadatmznesh, H. and Tannous, F. (1997). Durability of FRP Re-bar and Tendon, Non-Metallic (FRP) Reinforcement for Concrete Structures , In: Proceedings of the Third International Symposium, Vol. 2, Sapporo, Japan, pp. 107-114 .

Somboonsong, W. , Harris, H.G. and Ko, K. (1998). Ductile Hybrid Fiber Reinforced Plastic Reinforcing Bar for Concrete Structures: Design Methodology , ACI Materials Journal, 95(6): 655-666 .

Tamuzs, V., Tepfers, R., Apinis, R. and Janis, M. (1999). Pull-out, Flexural Rotation Capacity and Creep Tests using Hybrid Composite Rods and CFCC Rods for Reinforcement in Concrete, Institute of Polymer Mechanics Latvian Academy of Sciences Aizkraukles 23, Riga, LV-1006, Work No: 32, Publication: 99:4.

Nanni, A. , Bakis, C.E. and Terosky, J.A. (1996). Smart Pseudo-Ductile, Reinforcing Rods for Concrete: Manufacture and Test , In: Proc. 1st Int. Conf. on Composites in Infrastructures, ICCI 96, Tucson, Arizona, pp. 95-108 .

Belarbi, A. , Chandrashekhara, K. and Watkins, S. (1999). Manufacture and Performance Evaluation of FRP Rebar Featuring Ductility and Health Monitoring Capability, Performing Organization Report No. RDT. 99-105, Missouri Department of Transportation Research, Development and Technology Division, P.O. Box 270, Jefferson City, MO .

Chin, J.W. , Aouadi, K. and Nguyen, T. (1997). Effects of Environmental Exposure on Fiber-Reinforced Plastic (FRP) Materials Used in Construction , Journal of Composites and Technology Research, 19(4): 205-213 .

10.

Devalapura, R.K. , Gauchel, J.V. , Greenwood, M.E. , Hankin, A. and Humphrey, T. (1997). Long-Term Durability of GFRP Composites in Alkaline Environments , In: Proc. 3rd Non-Metallic (FRP) Reinforcement for Concrete Structures, International Symposium, Vol. 2, Sapporo, Japan, October 14-16, pp. 83-90 .

11.

Litherland, K.L. , Oakley, D.R. and Proctor, B.A. (1981). The use of Accelerated Ageing Procedures to Predict the Long Term Strength of GRC Composites , Cement and Concrete Research, 11(3): 455-466 .

12.

Vijay, P.V. (1999). Aging and Design of Concrete Members Reinforced with GFRP Bars, PhD Thesis, Department of Civil Engineering, West Virginia University, Morgantown, West Virginia.

13.

Won, J.P. and Park, C.G. (2004). Development of Ductile Hybrid FRP Reinforcing Bar and Prediction Model of Tensile Behavior , Journal of KSCE, 24(3): 491-500 .

14.

Al-Dulaijan, A.U. , Al-Zahrani, M.M. , Nanni, A. , Bakis, C.E. and Boothby, T.E. (2001). Effect of Environmental Pre-conditioning on Bond of FRP Reinforcement to Concrete , Journal of Reinforced Plastics and Composites, 20: 881-890 .

15.

DeFreese, J.M. (2001). Glass Fiber Reinforced Polymer Bars as the Top Mat Reinforcement for Bridge Decks, MS Thesis, Department of Civil Engineering Virginia Polytechnic Institute and State University, Virginia, pp. 20-25.

16.

Castro, P.F. and Carino, N.J. (1998). Tensile and Non-Destructive Testing of FRP Bars , Journal of Composites for Construction, 2(1): 17-27 .

17.

Malver, L.J. and Cox, J.V. (2003). Bond between Carbon Fiber Reinforced Polymer Bars and Concrete , Journal of Composites for Construction, 7(2): 154-163 .

18.

Focacci, F. , Nanni, A. and Bakis, C.E. (2000). Local Bond-Slip Relationship for FRP, Reinforcement in Concrete , Journal of Composites for Construction, 4(1): 1-9 .

19.

Uomoto, T. and Nishimura, T. (1997). Development of New Alkali Resistant Hybrid AGFRP Rod, Non-Metallic (FRP) Reinforcement for Concrete Structures , In: Proceedings of the Third International Symposium, Vol. 2, Sapporo, Japan, pp. 67-74 .

Effect of Environmental Exposure on the Mechanical and Bonding Properties of Hybrid FRP Reinforcing Bars for Concrete Structures

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