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Abstract The use of ultra-high-performance- fibre reinforced concrete (UHPFRC) in structural applications has significantly increased owing to its numerous advantages. (UHPFRC) if compared with conventional normal concrete (NC) and high-performance concrete (HPC), UHPFRC exhibits superior properties in terms of compressive behavior, tensile behavior, and durability. This study has investigated the mechanical properties (UHPFRC),the studied properties are (Compressive strength, modulus of elasticity, Poisson’s ratio, f1exural strength, tensile strength and bond strength). The major parameters included in this research were steel fibre volume fractions (Vr =0%, 1 %,2% and 3%) and steel fibre Aspect ratio (lId = 30 and 50). The research program consisted of seven UHPFRC mixes with different values of steel fibre volume fractions and aspect ratios. The relation between compressive strength and other mechanical properties were also investigated. The test results showed that adding steel fibres resulted in an improvement the mechanical properties of UHPC. Compressive strength, modulus of elasticity, splitting tensile strength, flexural strength and bond strength are on higher side for 3% steel fibres volume fraction as compared to those produced from 0%, 1 % and 2% fibres volume fraction. All strength properties were observed to increase with increasing aspect ratio of 50 as compared to those for aspect ratio 30.Compressive strength increases 4.0% , modulus of elasticity increases 6.0%, flexural strength increases 15%, splitting tensile strength increases 34% and bond strength increases 5% with addition of steel fibre volume fraction 1 % .Compressive strength increases 18.0% , modulus of elasticity increases 11.0%, f1exural strength increases 40%, splitting tensile strength increases 67% and bond strength increases 11 % with addition of steel fibre volume fraction 3% . |