Concrete, the bedrock of modern construction, consumes vast quantities of NA sourced from riverbeds and quarries, is finite, and its extraction has far-reaching environmental consequences. The construction industry is in full bloom due to industrialization and infrastructure development. Hence, the utilization of concrete has increased massively, and the continuation of the same rate is expected for the next decade. The yearly global use of concrete is ~five billion tons. The high demand for these materials is not sustainable for the long term. This leads to a critical need for alternative sources that can replace NA in concrete without compromising its structural integrity. The urgency of finding these alternatives cannot be overstated. Simultaneously, ~24 million tons of blast furnace slag (BFS), a by-product of the iron-making industry waste, is produced annually in India. Disposal of this is an increasing problem of storage and pollution. However, by finding an economical way to utilize BFS in the production of concrete, we can not only solve a waste management issue but also contribute to a more sustainable and eco-friendly construction industry. This study presents the effectiveness of BFS as a replacement for NA. Within our research, we have substituted varying percentages of NA (0–75%) with BFS coarse aggregates to assess strength and compare it with NA. The results indicate the feasibility of utilizing BFS aggregates to replace NA. The outcome of the replacement of NA by BFS coarse aggregate on the compressive strength of the M30 concrete is determined by testing the cube samples in the compressive testing machine after a curing period of 3, 7 and 28 days. The concrete mixes, whether incorporating BFS aggregates or not, showed comparable compressive strength. The compressive strength of concrete having 75% BFS coarse aggregate is reduced by 7.55% compared to conventional concrete containing 100% NA.