Investigation of Bond Strength Between GFRP Wrapped Steel Reinforcement and Concrete with Pullout Test

Abstract

The bond behavior of glass fiber reinforced plastic (GFRP) wrapped deformed steel reinforcements having corrosion resistant with concrete is one of the important factors affecting the flexural performance and ductility of structural member exposed to bending. However, the number of studies on the bond of these reinforcements with concrete is insufficient due to not existing so much investigation on this issue. In this study, resin-impregnated glass fibers were wrapped on deformed steel reinforcements and new composite reinforcements of three diameters were produced, and these composite reinforcements bond with concrete were examined by pullout test. In addition, the bond of these composite reinforcements was compared with the bond of unwrapped deformed steel reinforcement. In this context, a total of 18 pullout tests were conducted in the study. As a result of the study, it is observed that maximum bond strength of FRP wrapped deformed steel reinforcements being not applicated surface deformation (ribs, wound, sand coated etc.) ranged from 0.41 times to 0.64 times according to unwrapped steel reinforcements. In addition, it has been observed that the GFRP wrapped steel reinforcements maintain their bond strength up to high slipping values after reached the maximum bond strength values, compared to unwrapped deformed steel reinforcements.

Keywords

• Bond Strength
• Hybrid FRP Reinforcement
• Bond of Reinforcement
• GFRP Reinforcement
• Composite Rebar

References

1. 1. ACI 440.1R-15 Guide for the Design and Construction of Structural Concrete Reinforced with Fiber-Reinforced Polymer (FRP) Bars. American Concrete Institute (ACI). MI, USA, 2015.
2. 2. ACI 440R-96 State-of-the-Art Report on Fiber Reinforced Plastic (FRP) Reinforcement for Concrete Structures. American Concrete Institute (ACI). MI, USA, 2002.
3. 3. fib bulletin 40 FRP Reinforcement in RC structures. International Federation for Structural Concrete (fib). Lausanne, Switzerland, 2007.
4. 4. El Refai A, Abed F, Al-Rahmani A. Structural performance and serviceability of concrete beams reinforced with hybrid (GFRP and steel) bars. Construction and Building Materials 96 (2015) 518–29.
5. 5. Lau D, Pam HJ. Experimental study of hybrid FRP reinforced concrete beams. Engineering Structures 32 (12) (2010) 3857–65.
6. 6. Gemi L, Madenci E, Özkılıç YO. Çelik, Cam FRP ve Hibrit Donatılı Betonarme Kirişlerin Eğilme Performansının İncelenmesi. Düzce Üniversitesi Bilim ve Teknol Dergisi 30;8 (2020) 1470–83.
7. 7. Ju M, Lee S, Park C. Response of Glass Fiber Reinforced Polymer (GFRP)-Steel Hybrid Reinforcing Bar in Uniaxial Tension. International Journal of Concrete Structures and Materials 11 (2017) 677–86.
8. 8. Correia L, Cunha F, Mota C, Fangueiro R, Nunes JP. Pseudo-Ductile Braided Composite Rods (BCRs) Produced by Braidtrusion. In: ECCM17 - 17th European Conference on Composite Materials. Munich, Germany, 2016.

9. 9. Seo D-W, Park K-T, You Y-J, Lee S-Y. Experimental Investigation for Tensile Performance of GFRP-Steel Hybridized Rebar. Advances in Materials Science and Engineering 2016 (2016) 1–12.
10. 10. Seo D-W, Park K-T, You Y-J, Hwang J-H. Evaluation for Tensile Performance of Recently Developed FRP Hybrid Bars. International Journal of Emerging Technology and Advanced Engineering 4(6) (2014) 631–7.
11. 11. Wu G, Sun ZY, Wu ZS, Luo YB. Mechanical Properties of Steel-FRP Composite Bars (SFCBs) and Performance of SFCB Reinforced Concrete Structures. Advances in Structural Engineering 15(4) (2012) 625–35.
12. 12. Behnam BR. Reliability model for ductile hybrid FRP rebar using randomly dispersed chopped fibers. Wayne State University, Detroit, Michigan, 2012.
13. 13. Etman EE-S. Innovative Hybrid Reinforcement for Flexural Members. Journal of Composites for Construction 15(1)(2011) 2–8.
14. 14. Cheung MMS, Tsang TKC. Behaviour of Concrete Beams Reinforced with Hybrid FRP Composite Rebar. Advances in Structural Engineering 13(1) (2010) 81–93.
15. 15. Cui Y, Cheung MMS, Noruziaan B, Lee S, Tao J. Development of ductile composite reinforcement bars for concrete structures. Materials and Structures 41(9) (2008) 1509–18.
16. 16. Basaran B, Kalkan I. Investigation on variables affecting bond strength between FRP reinforcing bar and concrete by modified hinged beam tests. Composite Structures 242 (2020) 112185.
17. 17. Ju M, Park G, Lee S, Park C. Bond performance of GFRP and deformed steel hybrid bar with sand coating to concrete. Journal of Reinforced Plastics and Composites 36(6) (2017) 464–75.
18. 18. Saikia B, Thomas J, Ramaswamy A, Rao KSN. Performance of hybrid rebars as longitudinal reinforcement in normal strength concrete. Materials and Structures 38 (284) (2005) 857–64.
19. 19. Gemi L, Köklü U, Yazman Ş, Morkavuk S. The effects of stacking sequence on drilling machinability of filament wound hybrid composite pipes: Part-1 mechanical characterization and drilling tests. Composites Part B: Engineering 186 (2020) 107787.
20. 20. Gemi L, Köroğlu MA, Ashour A. Experimental study on compressive behavior and failure analysis of composite concrete confined by glass/epoxy ±55° filament wound pipes. Composite Structures 187 (2018) 157–68.
21. 21. Peters ST. Composite Filament Winding. ASM International, 2011.
22. 22. EN ISO 15630-1:2010 Steel for the reinforcement and prestressing of concrete - Test methods - Part 1: Reinforcing bars, wire rod and wire (ISO 15630-1:2010). European Committee for Standardization. 2010.
23. 23. EN ISO 6892-1:2016 Metallic materials - Tensile testing-Part 1: Method of test at room temperature (ISO 6892-1:2016). European Committee for Standardization. 2016.
24. 24. ASTM D7205/D7205M-06 Standard Test Method for Tensile Properties of Fiber Reinforced Polymer Matrix Composite Bars. ASTM International. USA, 2016.
25. 25. TS 802 Beton Karışım Tasarımı Hesap Esasları. Türk Standartları Enstitüsü (TSE). Ankara, 2016.
26. 26. EN 12390-3:2009 Testing hardened concrete - Part 3: Compressive strength of test specimens. European Committee for Standardization. 2009.
27. 27. ACI 440.3R-12 Guide Test Methods for Fiber- Reinforced Polymer (FRP) Composites for Reinforcing or Strengthening Concrete and Masonry Structures. American Concrete Institute (ACI). MI, USA, 2012.
28. 28. ASTM D7913 / D7913M - 14. Standard Test Method for Bond Strength of Fiber-Reinforced Polymer Matrix Composite Bars to Concrete by Pullout Testing. ASTM International. 2014.
29. 29. ACI 355.1R-91 State-of-The-Art Report on Anchorage to Concrete. American Concrete Institute (ACI). 1991.
30. 30. Müsevitoğlu A, Arslan MH, Aksoylu C, Özkış A. Experimental and analytical investigation of chemical anchors’s behaviour under axial tensile. Measurement 158 (2020) 107689.