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The paper studies the effects on the behavior of concrete produced using two major industrial wastes: Fly Ash (FA) and Granulated Blast Furnace Slag (GBFS). There are some works where both FA and GBFS have been replaced individually with cement and fine aggregates. But there are very few studies on the extent of improvement by using FA as cement replacement and GBFS as natural sand replacement in that same concrete mix. In this study, concretes with binary and ternary mixes, including FA as a binder and GBFS as filler constituents, were produced to investigate their effects on the mechanical characteristics of concrete with respect to various replacements and ages. In binary mix, Ordinary Portland Cement (OPC) was partially replaced (20%, 30% and 40%) with FA by weight. In ternary mix, Natural Sand (NS) was replaced 50% by weight with GBFS and again OPC was partially replaced (20%, 30% and 40%) with FA ash by weight in the same mix. Due to the replacement of OPC by FA and replacement of NS with GBFS, the slump was reduced from 9.3% to 25.6%. The test result shows that the binary mix gives up to 32.57% less strength than control mix. But the ternary mix with same FA replacement and 50% GBFS replacement improves the strength by 25.93% in 28 days and 13.93% in 90 days age. The best result achieved in all curing ages for the mix is 40% FA and 60% OPC with 50% NS and 50% GBFS. So, this mix can be used easily and effectively in any kind of normal concrete work. It will make the green concrete much more economical. [ABSTRACT FROM AUTHOR]