Title:
Physical and Mechanical Properties of Helical Wrap GFRP Bars for Reinforcing Concrete Structures
Author(s):
Girish Narayan Prajapati, Shehab Mehany, Wenxue Chen, and Brahim Benmokrane
Publication:
Symposium Paper
Volume:
360
Issue:
Appears on pages(s):
194-211
Keywords:
fiber-reinforced polymer (FRP), glass-FRP bars, helical wrap surface, physical properties, bond strength, tensile properties, moisture absorption.
DOI:
10.14359/51740625
Date:
3/1/2024
Abstract:
This paper presents an experimental study that investigated the physical and mechanical properties of the helical wrap glass fiber-reinforced polymer (GFRP) bars. The physical tests are conducted to check the feasibility and quality of the production process through the cross-sectional area and evaluation of the fiber content, moisture absorption, and glass transition temperature of the specimens. While the mechanical tests in this study included testing of the GFRP specimens to determine their tensile properties, transverse shear, and bond strength. Four bar sizes (#3, #4, #5, and #6), representing the range of GFRP reinforcing bars used in practice as longitudinal reinforcement in concrete members subjected to bending, are selected in this investigation. The GFRP bars had a helical wrap surface. The tensile failure of the GFRP bars started with rupture of glass fibers followed by interlaminar delamination and bar crushing. The bond strength of the GFRP bars satisfied the limits in ASTM D7957/D7957M. The test results reveal that the helical wrap GFRP bars had physical and mechanical properties within the standard limits.
Related References:
1. Al-Sulaimani, G. J., Kaleemullah, M., Basunbul, I. A., and Rasheeduzzafar, 1990, “Influence of Corrosion and Cracking on Bond Behavior and Strength of Reinforced Concrete Members,” ACI Structural Journal, 87(2), 220–231.
2. Fernandez, I., Bairán, J. M., and Marí, A. R., 2015, “Corrosion effects on the mechanical properties of reinforcing steel bars. Fatigue and σ-ε behavior,” Construction and Building Materials, 101, 772–783.
3. Benmokrane, B., El-Salakawy, E., El-Ragaby, A., and Lackey, T., 2006, “Designing and Testing of Concrete Bridge Decks Reinforced with Glass FRP Bars,” Journal of Bridge Engineering, 11(2), 217–229.
4. Tobbi, H., Farghaly, A. S., and Benmokrane, B., 2012, “Concrete columns reinforced longitudinally and transversally with glass fiber-reinforced polymer bars,” ACI Structural Journal, 109(4), 551–558.
5. Nanni, A., 1993, “Flexural Behavior and Design of RC Members Using FRP Reinforcement,” Journal of Structural Engineering, 119(11), 3344–3359.
6. De Luca, A., Matta, F., and Nanni, A., 2010, “Behavior of full-scale glass fiber-reinforced polymer reinforced concrete columns under axial load,” ACI Structural Journal, 107(5), 589–596.
7. Masmoudi, R., Theriault, M., and Benmokrane, B., 1998, “Flexural behavior of concrete beams reinforced with deformed fiber reinforced plastic reinforcing rods,” ACI Structural Journal, 95(6), 665–676.
8. Hassan, M., Ahmed, E., and Benmokrane, B., 2013, “Punching-Shear Strength of Normal and High-Strength Two-Way Concrete Slabs Reinforced with GFRP Bars,” Journal of Composites for Construction, 17(6), 04013003.
9. Benmokrane, B., Chaallal, O., and Masmoudi, R., 1996, “Flexural Response of Concrete Beams Reinforced with FRP Reinforcing Bars,” ACI Structural Journal, 93(1), 46–55.
10. Mehany, S., Mohamed, H. M., and Benmokrane, B., 2023, “Performance of Lightweight Self-Consolidating Concrete Beams Reinforced with Glass Fiber-Reinforced Polymer Bars without Stirrups under Shear,” ACI Structural Journal, 120(1), 17–30.
11. Kharal, Z. and Sheikh, S. A., 2018, “Seismic Performance of Square Concrete Columns Confined with Glass Fiber–Reinforced Polymer Ties,” Journal of Composites for Construction, 22(6).
12. Arafa, A., Ahmed, N., Farghaly, A. S., Chaallal, O., and Benmokrane, B., 2021, “Exploratory Study on Incorporating Glass FRP Reinforcement to Control Damage in Steel-Reinforced Concrete Bridge Pier Walls,” Journal of Bridge Engineering, 26(2).
13. Prajapati, G. N., Farghaly, A. S., and Benmokrane, B., 2022, “Behavior of Reinforced Concrete Columns with Hybrid Reinforcement (Steel/Glass Fiber-Reinforced Polymer) under Reversed Cyclic Load,” ACI Structural Journal, 119(4), 141–155.
14. CSA S806, 2021, Design and Construction of Building Structures with Fiber Reinforced Polymers (CAN/CSA S806-12). Canadian Standards Association, Ontario, Canada.
15. CSA S6, 2019, Canadian Highway Bridge Design Code. CSA S6-19, Canadian Standards Association, Ontario, Canada.
16. ACI Committee 440, 2022, Building Code Requirements for Structural Concrete Reinforced with Glass Fiber-Reinforced Polymer (GFRP) Bars-Code and Commentary (ACI 440.11-22). American Concrete Institute, Farmington Hills, MI.
17. AASHTO, 2018, AASHTO LRFD Bridge Design Guide Specifications for GFRP- Reinforced Concrete. American Association of State Highway and Transportation Officials, Washington, DC.
18. ASTM, 2021, Standard Test Method for Tensile Properties of Fiber Reinforced Polymer Matrix Composite Bars. ASTM D7205/D7205M-21, American Society for Testing and Materials, Conshohocken, USA.
19. ASTM, 2020, Standard Test Methods for Density and Specific Gravity (Relative Density) of Plastics by Displacement. ASTM D792-20, American Society for Testing and Materials, Conshohocken, USA.
20. ASTM, 2022, Standard Specification for Solid Round Glass Fiber Reinforced Polymer Bars for Concrete Reinforcement. ASTM D7957/D7957M-22, American Society for Testing and Materials, Conshohocken, USA.
21. ASTM, 2018, Standard Test Method for Ignition Loss of Cured Reinforced Resins. ASTM D2584-18, American Society for Testing and Materials, Conshohocken, USA.
22. ASTM, 2018, Standard Test Method for Water Absorption of Plastics. ASTM D570-98, American Society for Testing and Materials, Conshohocken, USA.
23. ASTM, 2014, Standard Test Method for Assignment of the Glass Transition Temperatures by Differential Scanning Calorimetry. ASTM E1356-08, American Society for Testing and Materials, Conshohocken, USA.
24. ASTM, 2017, Standard Test Method for Transverse Shear Strength of Fiber-reinforced Polymer Matrix Composite Bars. ASTM D7617/D7617M-11, American Society for Testing and Materials, Conshohocken, USA.
25. ASTM, 2020, Standard Test Method for Bond Strength of Fiber-Reinforced Polymer Matrix Composite Bars to Concrete by Pullout Testing. ASTM D7913/D7913M-14, American Society for Testing and Materials, Conshohocken, USA.
26. ASTM, 2021, Standard Test Method for Compressive Strength of Cylindrical Concrete Specimens. ASTM C39/C39M-21, American Society for Testing and Materials, Conshohocken, USA.