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The aim of this study is to evaluate the performance of M35 grade of concrete in addition of Ground-granulated blast-furnace slag and partial replacement of cement by glass fiber. Ground-granulated blast-furnace slag is pozzolanic materials that can be utilized to produce highly durable concrete composites. In this study Ground-granulated blast-furnace slag has been used to OPC which varies from 5% to 10% at interval of 2.5% by total weight of OPC and similarly partial replacement of OPC (43 grade) by glass fiber which varies from 0% to 0.4% at interval of 0.1% by total weight of OPC. All mixes (trial mix, control mix and variation mix) were prepared for M35 grade of concrete. This study investigates the performance of concrete mixture in terms of slump, compressive strength for 7days and 28 days, Flexural strength of beam 28 days and Splitting tensile strength of Cylinder for 28 days respectively.