Abstract
The widespread use of glass fibre reinforced polymer (GFRP) bars in reinforced concrete (RC) elements has yet been limited due to the anisotropic and non-homogeneous material behaviour of GFRP. The material characteristics of GFRP bars from different manufacturers vary as a function of several factors. Several standards have developed various procedures to investigate the mechanical characteristics of GFRP bars, but universal methods to test different types and diameters of GFRP bars in tension have not been fully developed. Due to the lack of such a standardized test procedure, there are some doubts and gaps in terms of the behaviour of GFRP bars in tension, which has led to lack of reliable information on their tensile properties. The determination of tensile characteristics of GFRP bars, including the tensile strength, modulus of elasticity, and ultimate strain, according to various test standards, is the main subject of the paper. This paper reports test results for tensile characterization obtained on four types of GFRP bars from four manufacturers with six various diameters. Moreover, the study compares various test procedures according to seven standards to characterize the tensile properties of GFRP bars, to examine the proposed test procedures, and to reveal main differences.
Highlights
Glass fibre reinforced polymer (GFRP) reinforcement has emerged as an attractive alternative of steel rebars due to the higher ultimate tensile strength to weight ratio, resistance to corrosion and chemical attack, electromagnetic neutrality, and long-term strength and durability of GFRP bars in harsh and corrosive environments [1–4]
GFRP bars should be tested using a universal method so that the various products on the market could be examined. The knowledge of these characteristics assists the analysis and design of structural concrete members reinforced with GFRP bars which are under flexure and tension
There is a fast-growing number of GFRP bars used in construction, and many variables determine the material characteristics of these products
Summary
Glass fibre reinforced polymer (GFRP) reinforcement has emerged as an attractive alternative of steel rebars due to the higher ultimate tensile strength to weight ratio, resistance to corrosion and chemical attack, electromagnetic neutrality, and long-term strength and durability of GFRP bars in harsh and corrosive environments [1–4]. Enormous potential exists for applications in multi-story buildings, parking garages, and industrial structures In these scenarios, GFRP could replace the steel bars in concrete susceptible to corrosion. GFRP rebars may differ in both raw components and surface texture (projection), which governs their mechanical behaviour These factors might constitute an effective parameter in the diversity of the reported values for the strength and modulus of elasticity of GFRP bars. Universal methods to test different types and diameters of GFRP bars in tension have not been fully developed. GFRP bars should be tested using a universal method so that the various products on the market could be examined The knowledge of these characteristics assists the analysis and design of structural concrete members reinforced with GFRP bars which are under flexure and tension. An investigation of load–strain behaviour and failure modes, and their correlation to the tensile characteristics are discussed
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