Mechanical properties and durability of steel fiber reinforced concrete: A review

The mechanical properties, constitutive model, fracture toughness, and durability of steel fiberreinforced concrete (SFRC) were summarized by analyzing the existing literature. The main limitations in the research were identified, and future prospects of SFRC were proposed. The toughness and crack resistance mechanism of SFRC were summarized from a microscopic point of view. The performance of early-strength concrete can be significantly improved by steel fiber, which results in the enhancement of toughness, shear strength, elastic modulus, and Poisson's ratio. Performance is further improved by increasing the length ratio and dosage of SF, with a more significant influence of fiber blending. The strain softening phenomenon after the peak stress of concrete is also advanced by SF, leading to an increase in the load-deflection curve and improved toughness. The addition of SF can also enhance the resistance of concrete to chlorine ions, freeze-thaw, and carbonization, thereby extending the service life of concrete. In this paper, the classical constitutive model of concrete is explained, the current application of the SFRC model is summarized, and possible research directions are proposed.