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This study was conducted to investigate the effect of colloidal nanosilica on the properties of High Performance Concrete with copper slag as fine aggregate at a constant replacement level of 40%. Cement mortars and concrete mixes were produced by replacing Portland cement by colloidal nanosilica at 0.5%, 1%, 1.5%, 2%, 2.5% and 3%. Tests on workability, compressive strength, splitting tensile strength, flexural strength, rapid chloride penetration, water absorption, sorptivity and abrasion resistance were conducted on concrete mixes. The results indicate that the water demand increases due to the increase in the percentage of nanosilica owing to its high specific surface area. The amount of super plasticizer was adjusted in each mix to maintain a constant workability. The strength, penetration properties and resistance to abrasion of High Performance Slag Concrete (HPSC) were generally improved with the …