Abstract
Steel fiber embedded in concrete serves to reduce crack development and prevent crack growth at the macroscopic level of the concrete matrix. Steel fiber-reinforced concrete (SFRC) with high compressive concrete strength is affected primarily by the dimensions, shape, content, aspect ratio, and tensile strength of the embedded steel fiber. In this study, double-ended hook steel fiber was used in SFRC with a concrete compressive strength of 80 MPa. This fiber was used for the study variables with two aspect ratios (64, 80) and tensile strength values up to 1600 MPa. The flexural performance of the SFRC specimens was evaluated using crack mouth open displacement tests, and the test results were compared with code provisions. A modified reinforcement index was also used to quantify the flexural performance based on comparisons with fracture energy.
Highlights
The addition of steel fiber into concrete mixtures mitigates brittle failures in the concrete matrix.the bridging effect of the steel fiber in the concrete mixture, which occurs after cracking, enhances the mixture’s structural behavior in terms of shear strength, flexural strength, ductility, impact resistance, and fatigue [1,2,3]
Experimental studies found in the literature [5] are limited to steel fiber aspect ratios of 70 and tensile strength values of 1000 MPa
As the fiber content and aspect ratio were increased in the Gao et al study, the flexural strength improved by 9.6% to 90%, and the experimental results indicated that a fiber content of 1.0% to 1.5% is needed to enhance the flexural behavior of high-strength concrete
Summary
The addition of steel fiber into concrete mixtures mitigates brittle failures in the concrete matrix. Gao et al (1997) [6] investigated the flexural behavior of high-strength concrete with a range of fiber contents (0%–2.0%) and aspect ratios (46–70). As the fiber content and aspect ratio were increased in the Gao et al study, the flexural strength improved by 9.6% to 90%, and the experimental results indicated that a fiber content of 1.0% to 1.5% is needed to enhance the flexural behavior of high-strength concrete. The mechanical properties of SFRC with the compressive concrete strength of 50 MPa and variables of different steel fiber contents (0%–1.5%) and aspect ratios (45, 65, 80). Köksall et al (2012) [9] continued to study the mechanical properties of SFRC with respect to concrete compressive strength and fiber tensile strength. We investigated the flexural performance of SFRC by measuring crack mouth opening displacement (CMOD)
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