Behavior and Calculation Method of the Flexural Strength of Reinforced Concrete Beam with Fiber

Abstract

This paper aims to study the flexural strength behavior of reinforced concrete beam with varioustypes of fiber, which were steel fiber, glass fiber and acrylic fiber and to propose a method for calculatingthe flexural strength of reinforced concrete beam with fiber. The fiber contents in reinforced concretewere 0.1% 0.2% and 0.5% by volume of concrete. The compressive strength, tensile strength, flexuralstrength, modulus of elasticity and Poisson's ratio of concrete were also investigated. From theexperimental results, when the flexural reinforcement of reinforced concrete (RC) beam was keptconstantly, the RC beams with acrylic fiber, glass fiber and steel fiber exhibited higher flexural strengthand ductility than a RC beam without fiber. For fiber content of 0.1-0.2% by volume of concrete, theflexural strength of RC beam with acrylic fiber was larger than those of steel fiber and glass fiber. But,for fiber content of 0.5% by volume of concrete, the flexural strength of RC beam with steel fiber washigher than those of glass fiber and acrylic fiber. Finally, the proposed method for calculating the flexuralstrength of reinforced concrete beam with fiber at various states can predict the flexural strength ofreinforced concrete beam with satisfactory error.