In the whole world concrete is mostly used in mass quantity for a construction. It is expected that in the near future, the civil engineering community will have to produce structures in harmony with the concept of sustainable development. A number of studies have been carried out to investigate the possibility of utilizing a broad range of materials as partial replacement material for cement in the production of concrete using various different materials like fly ash, silica flume, GGBS etc. Glass Fiber Reinforced Concrete or (GFRC) is a composite that has glass fibers instead of steel strands for its reinforcement. AR Glass Fibers are designed specifically for use in concrete.It is found that by the partial replacement of cement and glass fiber with effect of magnetic water helped in improving the strength of the concrete sustainably compared to normal mix concrete. The OPC is responsible for the majority of the embodied carbon content of concrete. Significant reductions in environmental impacts occur for GGBS.The present study investigates the effects on compressive strength of concrete of 50 % cement replacement with granulated ground blast furnace slag using alkali resistant glass fibers with varying percentage i.e. 0.2%, 0.3%, 0.4% & 0.5% respectively for 7 days and 28 curing days and effect of magnetic water used in mixing and curing concrete and compare the results with different percentage of fibers and curing days. Twenty mixes were tested and studied with different percentage of glass fiber with and without effect of magnetic water. Among the mixes the mix with replacement of 50% GGBS and 0.3% of AR glass fiber is better with respect to strength.