Performance Assessment of Tri-Hybrid Fiber Composites in the Shear Behavior of Concrete Deep Beam

Abstract

This research examines the improvement of shear strength of reinforced concrete (R.C.) deep beams by using a blending of three different types of fibers: crimped steel fiber, polypropylene fiber, and glass fiber, each offering distinct characteristics. The optimal mix ratios for these fibers in M20 grade concrete are determined to be 1.25% of crimped steel fiber, 0.2% of polypropylene fiber and 0.1% of glass fiber with respect to volumetric proportions of concrete. This specific combination in R.C. deep beam demonstrates that, the shear strength of hybrid fiber reinforced concrete (HFRC) deep beam found to be 42.7%, exceeding that of conventional R.C. deep beam. The addition of these hybrid fibers in the R.C. deep beams promotes environmentally friendly practices by reducing carbon dioxide emissions by approximately 10.92% when compared to standard R.C. deep beams.