The natural fibres are easily available, and the usage of natural fibres are attractive considering their environmental aspect. In this work the Sisal Fibre [SF] act as reinforcement, to improve the tensile strength in concrete. They are eco-friendly materials in the construction industry since they prove that depleting the natural and non-renewable resources without compromising the desirable properties of the concrete. The additions of [SF] in concrete relevantly improve its performance in the study of compression, split, tensile and flexural on concrete specimens. The experimental investigation has been conducted on fresh and hardened concrete with and without SF at different proportions (0.25%, 0.50%, 0.75%, 1% and 1.25% with the weight of binder) and getting optimum result at 1%.