Direct shear of steel fiber self-compacting concrete

The impact of steel fiber on the direct shear of normal-strength and high-strength self-compacting concrete (SCC) is investigated experimentally in this research. The scheme of empirical work is divided into two groups. In the first group, the impact of different steel fiber volumetric ratios of 0%, 0.40%, and 0.80% was investigated on normal-strength SCC. In contrast, in the second group, the same ratios were investigated on high-strength SCC. The outcomes revealed that increasing the volumetric ratio of steel fiber in normal-strength SCC from 0% to 0.4% and 0.8% made the ultimate direct shear stress increase by 9.3% to 18.8% and the maximum vertical displacement increased by 10.5% and 19.1% respectively. While increasing steel fiber from 0% to 0.4% and 0.8% made the ultimate shear stress increase by 4.9% and 14.6% and the maximum vertical displacement increased by 8.4% and 16.5%. Also, the enhancement due to the presence of steel fibers in high-strength SCC direct shear samples was lower than that of normal strength SCC samples. The toughness that represents the ductility index, increased with increasing steel fiber ratio and SCC under direct shear became more ductile.