Comparative study on effects of steel fiber and imitation steel fiber on dynamic tensile properties of ultra-high-performance cementitious composites

Steel fibers (SFs) are commonly used to enhance the performance of concrete. However, they possess limitations such as susceptibility to corrosion, agglomeration during construction and high cost. To overcome these shortcomings, alternative fiber options have been explored. This study investigates and compares the mechanical properties of ultra-high-performance cementitious composites (UHPCC) reinforced with SFs and imitation steel fibers (ISFs). Various tests, including uniaxial compression, quasi-static splitting and dynamic splitting, are conducted to examine the effects of fiber aspect ratio (Lf /df = 20, 30, 40), fiber content (Vf = 0.5