Many types of research have been currently going to modify and improved the concrete properties by the addition of different types of materials. This Experimental investigation represents the Optimum use of the fibres with the concrete mixture and will help in achieving the desired results. This Experimental work shows the investigation on M35 grade due to the incorporation of glass fibres. In this Experiment, we used the glass fibres of Filament diameter 14 microns with aspect ratio 857 at various percentages like 0%,0.4%.0.8%,1.2%.1.6 by the weight of concrete on M35 grade of mix proportion (1:1.60: 2.96) with water cement ratio 0.45. Hence, in this research, the Experimental investigations and analysis of results were conducted to study the compressive, tensile and flexural behavior of composite concrete with varying percentage of such fibres added to it. The concrete mix adopted were M35 with varying percentage of fibres ranging from 0, 0.4, 0.8, 1.2 & 1.6% by weight of concrete. On the analysis of test results, the concrete with straight glass fibres had improved performance as compared to the conventional concrete, which was readily available in the market. From the experimental investigation, It has been found that optimum dosage amount of glass fibre of concrete is 1.6 % by weight of concrete because at this point the compressive strength of GFRC increased up to 5 % as compared to plain concrete while the flexural Strength increased up to 53% and Split Tensile Strength increased up to 36% at 0.8% GF by weight of concrete The common person in their regular constructions could easily adopt these sustainable improvements or modifications.