Alternate materials in the research of high strength concrete (HSC) have become a prominent practice all over the world in the past decades to enrich the long-term strength, high workability, better durability, economy and environmental factors. This study presents the mechanical characteristics of high strength concrete (HSC) with the influence of low calcium silicate alccofine (Alccofine 1203). The enhanced workability at the given low water cement ratio and improved pore filling capability was observed by indulging alccofine in the HSC. It is also observed that due to the presence of alccofine particles, the concrete gains high strength much early. The presence of optimum dosage of alccofine in the regular HSC is anticipated to progress the strength of concrete at early age and deliver superior durability characteristics such as resistance against accelerated corrosion attack, sea water attack and chloride attack. This work has its core on the investigational examination on mechanical properties such as flexural strength, split tensile strength and compressive strength on HSC by replacing cement with alccofine, which varied from 0 to 20% at 5% increments for 7, 14 and 28 days and concluded with the determination of optimum dosage of alccofine as the replacement of cement. © 2024 Elsevier B.V., All rights reserved.