Fiber type influence on the reinforced concrete under axial tension

Abstract

Abstract The results of experimental studies of properties of steel fiber-reinforced concrete of different types under axial tension are presented. A stand with a flexible design of the grip element connection has been developed, which provides axial load application and minimizes the effect of stress concentration at the ends of the specimen. The design is based on the ideas of the well-known Michaelis device. The design of the stand is such that the distance between the axis of load application and the central joint is 108 cm and between this joint and the axis of the test specimen is 21 cm, resulting in the load applied to the specimen being 5.143 times the applied load. The limits of fiber concrete axial tensile strength have been determined - 1.28 MPa when reinforced with wave or spun fiber and 1.37 MPa when reinforced with anchor fiber or a combination of the three types of fiber, which is 4.1 % and 4.4 % of compressive strength, respectively. It was also found that the concrete reinforced with anchor fiber or with the combined dispersed fiber reinforcement has higher deformation properties than the concrete reinforced with wave or spun fiber. The analysis of strength and deformation properties of fiber concrete when reinforced with different types of fibers allows to recommend anchored fibers for practical application.