Evaluation of Tensile Strength of Glass Fiber Reinforced Polymer Rebars under the Marine Environment - A Durability Approach

International Journal of Civil Engineering

© 2024 by SSRG - IJCE Journal

Volume 11 Issue 3

Year of Publication : 2024

Authors : Mohamed Firdows Mohamed Zakkaria, Packialakshmi Shanmugam

10.14445/23488352/IJCE-V11I3P101

How to Cite?

Mohamed Firdows Mohamed Zakkaria, Packialakshmi Shanmugam, "Evaluation of Tensile Strength of Glass Fiber Reinforced Polymer Rebars under the Marine Environment - A Durability Approach," SSRG International Journal of Civil Engineering, vol. 11,  no. 3, pp. 1-11, 2024. Crossref, https://doi.org/10.14445/23488352/IJCE-V11I3P101

Abstract:

Over the past decade, there has been a significant rise in the use of Glass Fiber-Reinforced Polymer (GFRP) bars as internal reinforcement for concrete structures, primarily owing to their remarkable corrosion resistance. However, a critical concern has arisen regarding their susceptibility to degradation in terms of tensile strength and elastic modulus when exposed to harsh alkaline and saline environments. This study specifically focuses on the impact of such environments on two distinct types of GFRP rebars: sand-coated and twisted. The experiment involved subjecting these rebars to an accelerated temperature of 60 degrees Celsius for 180 days. The primary objective is to assess the extent to which GFRP rebars experience a reduction in tensile strength under the influence of moisture, alkaline solutions, and saline conditions. Preliminary findings reveal that the tensile strength of the GFRP rebars underwent a significant reduction during exposure to alkaline conditions. Specifically, the twisted GFRP rebars experienced a 25-30% reduction, while the sand-coated counterparts exhibited a 20% reduction in tensile strength. These observations highlight the vulnerability of GFRP rebars in alkaline environments. Furthermore, the study has identified a 15% reduction in tensile strength for both types of GFRP rebars under the influence of saline conditions. The implications of these reductions are currently the subject of further investigation as the research delves into understanding the effects of alkaline and saline exposure on the overall performance and durability of GFRP bars in concrete structures.

Keywords:

Glass Fiber Reinforced Polymer Rebars (GFRP), Sand-coated, Tensile strength, Elastic modulus, Twisted GFRP.

References:

[1] Brahim Benmokrane et al., “Effects of Diameter on the Durability of Glass Fibre-Reinforced Polymer Bars Conditioned in Alkaline Solution,” Journal of Composites for Construction, vol. 21, no. 5, pp. 1-12, 2017.
[CrossRef] [Google Scholar] [Publisher Link]
[2] Hyeong-Yeol Kim et al., “Short-Term Durability Test for GFRP Rods under Various Environmental Conditions,” Composite Structures, vol. 83, no. 1, pp. 37-47, 2008.
[CrossRef] [Google Scholar] [Publisher Link]
[3] Daoguang Jia et al., “Durability of Glass Fibre-Reinforced Polymer (GFRP) Bars Embedded in Concrete under Various Environments. I: Experiments and Analysis,” Composite Structures, vol. 234, 2020.
[CrossRef] [Google Scholar] [Publisher Link]
[4] Jianwei Tu, Hua Xie, and Kui Gao, “Prediction of the Long-Term Performance and Durability of GFRP Bars under the Combined Effect of a Sustained Load and Severe Environments,” Materials, vol. 13, no. 10, pp. 1-18, 2020.
[CrossRef] [Google Scholar] [Publisher Link]
[5] N. Garg, and S. Shrivastava, “Environmental and Economic Comparison of FRP Reinforcements and Steel Reinforcements in Concrete Beams Based on Design Strength Parameter,” Proceedings of the UKIERI Concrete Congress, Jalandhar, India, pp. 1-9, 2019.
[Google Scholar] [Publisher Link]
[6] Hamed Fergani et al., “Characterization and Durability Study of GFRP Bars Exposed to Severe Environments and under Sustained Loads,” Proceedings of the Fifth International Conference on Durability of Fiber Reinforced Polymer (FRP) Composites for Construction and Rehabilitation of Structures, pp. 1-9, 2017.
[Google Scholar]
[7] Carlos N. Morales et al., “Durability of GFRP Reinforcing Bars in Seawater Concrete,” Construction and Building Materials, vol. 270, 2021.
[CrossRef] [Google Scholar] [Publisher Link]
[8] Antonio Nanni, “Guide Test Methods for Fiber Reinforced Polymers for Reinforcing or Strengthening Concrete Structures,” Technical Report, Manual of Concrete Practice, American Concrete Institute, 2004.
[Google Scholar] [Publisher Link]
[9] Canadian Standards Association, Design and Construction of Building Components with Fibre-Reinforced Polymers (CAN/CSA S806- 02), 2022. [Online]. Available: https://www.csagroup.org/store/product/2415292/
[10] Francesco Micelli, and Antonio Nanni, “Durability of FRP Rods for Concrete Structures,” Construction and Building Materials, vol. 18, no. 7, pp. 491-503, 2004.
[CrossRef] [Google Scholar] [Publisher Link]
[11] Alvaro Ruiz Emparanza et al., “Durability Assessment of GFRP Rebars in Marine Environments,” Construction and Building Materials, vol. 329, 2022.
[CrossRef] [Google Scholar] [Publisher Link]
[12] ASTM International, “Standard Specification for Solid Round Glass Fibre Reinforced Polymer Bars for Concrete Reinforcement,” Technical Report, ASTM D7957/D7957M-22, ASTM, 2017.
[Google Scholar] [Publisher Link]
[13] Iwao Sasaki et al., “Durability Evaluation of FRP Cables by Exposure Tests,” Non-Metallic (FRP) Reinforcement for Concrete Structures: The Third International Symposium Proceedings, vol. 2, pp. 131-137, 2004.
[Google Scholar]
[14] T. Uomoto, “Durability of FRP as Reinforcement for Concrete Structures,” Advanced Composite Materials in Buildings and Structures 3 rd International Conference, Ontario, Canada, pp. 3-14, 2000.
[Google Scholar]
[15] Abdeldjelil Belarbi, and Huanzi Wang, “Bond Durability of FRP Bars Embedded in Fibre-Reinforced Concrete,” Journal of Composites for Construction, vol. 16, no. 4, pp. 371-380, 2012.
[CrossRef] [Google Scholar] [Publisher Link]
[16] P.V. Vijay, H.V.S. GangaRao, and Rajesh Kalluri, “Hygrothermal Response of GFRP Bars under Different Conditioning Schemes,” The Proceedings of the 1st International Conference on Durability of Fiber Reinforced Polymer for Construction (CDCC’98), Sherbrooke, Canada, pp. 243-252, 1998.
[Google Scholar]
[17] International Concrete Abstracts Portal, “440.1R-06: Guide for the Design and Construction of Structural Concrete Reinforced with FRP Bars,” Technical Report, American Concrete Institute, pp. 1-44, 2006.
[Google Scholar] [Publisher Link]