Fibre reinforcement usually increases the performance of the concrete in many aspects, this paper deal addition of Sisal Fibre Reinforcement (SFR) in concrete to improve the performance at the same time reducing cement consumption by replacing with Groundnut Shell Ash (GSA). These materials not just lessen the emanation of carbon dioxide gas in the climate additionally utilized as a substitute for the bond to take care without bounds demand. In the present work, GSA replacement for cement is 0,

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... 5, 10, 15 and 20%; SFR is added for each set percentage of GSA as 1, 2 and 3% by its weight. Na2CO3 treatment was carried out to reduce the potential deterioration of SF. The compressive strength, flexural bending strength, deflection of the beam and economic consideration for M25 concrete specimen was done. Totally 120 numbers concrete 150 x150 mm cube and 9 number of 100 x 150 x 800mm flexural member cast and tested. It is recommended up to 10% of replacement of cement by GSA and 2 % addition of SF provide optimum values from investigation and economic consideration.