This work presents the study of effect of performance of HPC using mineral admixture i.e. silica fume with M-70 grade of IS cube specimen. We partially replaced cement by weight of binder with silica fume replacement with percentages of 5%, 7% and 9%. We used Conplast SP430-Sulphonated Naphthalene Polymers as a super plasticizer for better workability for top performance concrete. Dosage for super plasticizers is same 1% for all mix proportions. Also, we've investigated compressive strength, split lastingness and flexural strength for all different cases. The HPC mix, grade M70 concrete is supposed as per Indian standards “Guide for selecting proportions for top strength concrete with Pozzolana Portland cement and other cementitious materials”.