This study evaluated the influence of mineral admixtures (fly ash and GGBS) on the properties of concrete mixtures containing chemical admixtures. Concrete mixtures were prepared by replacing cement with 15-45% fly ash or 40-60% GGBS. Compressive, split tensile, and flexural strength tests were performed on specimens cured for 3, 7, and 28 days. Results showed that replacing 15% of cement with fly ash or 50% with GGBS improved workability and increased compressive strength by over 5% and 7% respectively at 28 days compared to a control mixture. Replacing cement with mineral admixtures also improved split tensile and flexural strengths. The optimum replacements were found