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ABSTRACT Objective: The most extensively utilised construction material worldwide is concrete. The consideration of cost savings, energy savings, environmental protection, and resource conservation has resulted in a dramatic rise in the use of mineral admixtures to cement along with the expansion of the concrete industry. However, pressure to limit cement usage by supplemental materials has been brought about by protecting the environment over harm caused by the mining of raw materials and carbon dioxide emissions during cement production. The most recent advancement in concrete is High Performance Concrete (HPC). To reduce the amount of cement usage in concrete by adding Supplementary Cementitious Materials (SCM), enhance performance, improve the durability has significant research symbolic importance Methods: The effect of supplementary cementitious materials added to a Tertiary blend on the typical tensile and flexural strength of HPC concrete is investigated in this study. A total of 32 concrete mixtures were created and compared with different water-binder (W/B) ratio, percentage of hybrid fiber (crimped steel fiber and polypropylene fiber), percentage of mixed mineral additive (fly ash, metakaolin, and silica fume), and the Aggregate- binder (A/B) ratios 1.75 and 2.0. The reference mixture simply contains OPC cement as a binder is compared to the results of analyses of the tensile and flexural strength of hybrid fiber-reinforced high performance tertiary concrete. Findings: It was found that the combined effect tertiary blend of fly ash, metakaolin, and silica fume at 15% combined substitute of cement and the addition of composite fiber amount of CSF=1% and PPF fibers=0.25% for W/B of 0.275 was the optimum combination to reach the highest tensile and flexural strength in 28 days. Novelty: According to studies, partial replacement of cement by adding combined mineral admixtures in concrete enhances the mechanical properties like tensile and flexural strength of concrete considerably with respect to conventional concrete.