Study of Steel Fiber Bond Behavior Affected by Corrosion and Orientation

Abstract

This study investigates the influence of surface corrosion and fiber orientation on the pull-out behavior of various hooked-end steel fibers embedded in mortar. The inclination angle of the fibers ranged from 0° to 45°, while the degree of surface corrosion varied from 0% to 10%. The test specimens are dog-bone-shaped cast using molds in accordance with ASTM C307 standards. Each specimen has a cross-sectional width of 25 mm, a depth of 25 mm, and a length of 75 mm, with a notch made at the center of the specimen. The analysis focused on the peak pull-out load, and corresponding slip values of specimen with different influence parameters. The results indicate that 5D steel fibers with 5% surface corrosion and an inclination angle of 30° provide optimal fiber bridging capability, enhancing overall bonding performance in mortar. Additionally, the findings suggest that when a small amount of rust forms on the steel fibers, increasing the inclination angle and the number of hooked layers enhances the bonding strength.