The present experimental investigation is to study the effect of replacement of Cement by Ground Granulated Blast Furnace Slag (GGBS) and Fine Aggregate (FA) by M-Sand. The effects of combined replacement by GGBS, M-Sand, and chopped basalt strands on compression strength, split tension strength, and young's modulus strength of concrete are also investigated. Comparison of the results of tests on Conventional Concrete, and concrete made with partial substitutions and combinations of GGBS, M-Sand, and chopped basalt strands are done. The durability of concrete is studied through an acid attack test on specimens of both Conventional Concrete and modified concrete. Replacement levels of fine aggregate with M-Sand are 10%, 20%, and 30%. Replacement levels of Cement with GGBS are 10%, 15%, and 20%. The dosage of basalt fibres is 1%, 1.5%, and 2% by weight of cement. The mechanical properties were compared with the control mix for a combination of GGBS (15%), M-Sand (30%), and 1.5% of Basalt Fibre. There is a significant performance improvement of the compressive strength, by up to 21%. A similar trend is observed in the case of Split Tensile Strength (29.5%) and in Flexural Strength (9.2%).