This paper describes the enhancement in the strength of the M35 grade concrete mix by the addition of Polypropylene fibres (recron 3S) in the proportion of 0.0%, 0.1%, 0.2%, 0.3%, 0.4%, and 0.5% by volume of concrete were used in the. The tests were carried out to determine the mechanical properties of concrete upto 7, 14 and 28 days for compressive strength, split tensile strength and flexural strength. Slump test were carried on fresh concrete while compressive strength, split tensile strength and flexural strength were carried on hardened concrete. The slump test results conclude that the workability of the polypropylene fibre mixes goes on decreasing as the fibre content is increased in the concrete mix.0.3% rcron3 s improved tensile strength of concrete from 2.65MPa to 3.4MPa and flexural strength from 5.13MPa to 6.83MPa after 28 days of curing. Increase in concentration of recron 3s beyond 0.3% showed decline in flexural strength from 6.83MPa to 5.7MPa.