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.