This research examined sustainable concrete utilizing recycled steel slag (RSS) as a partial sand replacement and granulated blast furnace slag (GBFS) as a cement substitute. The study analyzed fresh properties, strength, and durability of various mixtures. Material characterization involved sieve analysis, density measurement, and moisture absorption testing. Fresh concrete properties were assessed through slump tests, while compressive, flexural, and tensile strengths were evaluated at different ages. Durability was investigated via water absorption and acid resistance tests. The experiment explored RSS replacements of 0, 15, 25, 35, and 45%, maintaining a 30% GBFS cement substitution and a 0.45 water-to-binder ratio for M30 grade concrete. The optimal mix, balancing performance, and durability, contained approximately 30% RSS and 30% GBFS. Environmental impacts of incorporating these recycled materials were also evaluated. This study contributes to the development of sustainable concrete mixtures that utilize recycled materials and enhance performance. The findings promote eco-friendly alternatives in construction and support more sustainable practices in the concrete industry. The research highlights the potential for recycled materials to create high-performance, environmentally friendly concrete suitable for various applications, ultimately encouraging the adoption of greener construction methods.