Performance of Various Pozzolanic Materials on Shear and Impact Strength of Concrete made with Partial Replacement of Natural Fine Aggregate by Manufactured Sand

Nowadays concrete is the widely used construction material in civil engineering field because of its extraordinary strength and durability. The over-utilization of cement and natural sand for civil industry has several undesirable social and ecological consequences. As an answer for this, industrial wastes called as by-products (pozzolanic materials) such as fly ash, GGBFS, silica fume and metakaolin can be used to interchange partially cement and natural fine aggregate by manufacturing sand (M-sand). This research aims to investigate the possibility of replacing natural fine aggregate by M-sand and with 20% of above pozzolanic materials substitute in concrete. In this experimentation, natural fine aggregate was partially replaced by M-sand in various percentages (0%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% and 100%), with water cement ratio of 0.45 and cement was partially substituted by 20% of pozzolanic materials. M30 concrete grade proportions were considered as per IS 10262:2019 guidelines. The shear strength and impact strength results were checked for the different concrete mix proportions and compared with conventional concrete. From this research work, it is concluded that for partially replacing of 60% natural fine aggregate by M-sand and 20% cement by silica fume yields maximum shear and impact strength than conventional concrete.