Experimental Study on the Mechanical Properties of FRP Bars by Hybridizing with Steel Wires

Ji-Hyun Hwang, Dong-Woo Seo, Ki-Tae Park, Young-Jun You

Structural Engineering Research Division, Korea Institute of Construction Technology, Goyang, Korea.

DOI: 10.4236/eng.2014.67039                

Abstract

Many studies on fiber reinforced polymer composite bars, as a substitute for reinforcing bars, have been conducted to solve corrosion of steel in reinforced concrete structures since 1960s’. However, FRP Bars have a lower elastic modulus than steel rebar as a structural component of concrete structures. Material properties with brittleness fracture and low elastic modulus can be improved by combining cheaper steel than carbon or aramid fibers. In this study, prototypes of FRP Bars with inserted steel wires (i.e., “FRP Hybrid Bars”) were developed and their tensile performance was compared depending on the proportion and diameter of steel. The FRP Hybrid Bars were made by dividing them into D13 and D16 according to the diameter and proportion of inserted wires: GFRPs were combined with wires having different diameters of 0.5 mm, 1.0 mm, and 2.0 mm in the proportion of 10%, 30%, 50%, and 70%, respectively. As a result of tensile tests, the elastic modulus of FRP Hybrid Bars were improved as 20% - 190% in comparison with the fully GFRP Bars.

Keywords

Fiber-Reinforced Polymer (FRP), FRP Hybrid Bar, Tensile Test, Steel Wire

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	Canadian Society of Civil Engineers (1991) Advanced Composites Materials with Application to Bridges. Canadian Society of Civil Engineers, Montreal.
[2]	Kretsis, G.A. (1987) Review of the Tensile, Compressive, Flexural and Shear Properties of Hybrid Fibre-Reinforced Plastics. Composites, 18, 13-23. http://dx.doi.org/10.1016/0010-4361(87)90003-6
[3]	Jones, K.D. and DiBenedetto, A.T. (1994) Fiber Fracture in Hybrid Composite Systems. Composites Science and Technology, 51, 53-62. http://dx.doi.org/10.1016/0266-3538(94)90156-2
[4]	Cui, Y. and Tao, J. (2009) A New Type of Ductile Composite Reinforcing Bar with High Tensile Elastic Modulus for Use in Reinforced Concrete Structures. Canadian Journal of Civil Engineering, 36, 672-675. http://dx.doi.org/10.1139/L09-012
[5]	Korea Institute of Construction Technology (KICT). www.kict.re.kr
[6]	Seo, D.W., Park, K.T., You, Y.J. and Kim, H.Y. (2013) Enhancement in Elastic Modulus of GFRP Bars by Material Hy-bridization. Engineering, 5, 865-869. http://dx.doi.org/10.4236/eng.2013.511105
[7]	Korea Institute of Construction Technology (KICT) (2004) Design and Construction Technology for Concrete Structures Using Advanced Composite Materials: FRP Rebars and Grids (in Korean). Interim Report Submitted to the Korea Research Council of Public Science and Technology.
[8]	ASTM. D 3916 (2002) Standard Test Method for Tensile Properties of Pultruded Glass-Fiber-Reinforced Plastic Rods. http://news.cnfrp.net/file_dir/2012-12/20121221100040.pdf
[9]	CSA (2002) Test Method for Tensile Properties of FRP Reinforcement. Canadian Standard Association, Mississauga.