Enhancing M25 Concrete with Gabbro and Granite Aggregates: A Performance Evaluation

Concrete is one of the most essential construction materials worldwide. Modifying its composition by incorporating different types of aggregates can significantly influence its properties. This study investigates the feasibility of using gabbro and granite stone as coarse aggregates in M25 grade concrete. An experimental program was designed to evaluate the mechanical and fresh properties of concrete incorporating various proportions of gabbro and granite aggregates. The concrete mixes were prepared using the British standard mix design method, and six combinations were tested with varying aggregate ratios. Nine specimens were cast for each mix and tested for workability and compressive strength at 7, 28, and 56 days of curing. The results showed that increasing the proportion of gabbro aggregates improved both workability and compressive strength. The 100% gabbro mix achieved the highest compressive strength with increases of 31.81%, 16.13%, and 17.8% over the control mix at 7, 28, and 56 days respectively. The findings support the suitability of gabbro as a sustainable and high-performance aggregate for concrete applications.