Chloride-Induced Corrosion Resistance of High-Volume Slag and High-Volume Slag–Fly Ash Blended Concretes Containing Nanomaterials

Abstract

This paper evaluates the effect of the addition of nanocalcium carbonate (NC) and nanosilica (NS) on chloride-induced corrosion, chloride diffusion, chloride permeability, and service life of high-volume slag (HVS) and high-volume slag–fly ash (HVS-FA) blended concretes containing more than 70% blast furnace slag (BFS) and combined BFS and FA as the partial replacement of ordinary Portland cement (OPC). Compared to the control OPC concrete, the HVS and HVS-FA concretes containing NC and NS exhibited superior compressive strengths in all curing ages up to 365 days. Superior performance against chloride permeability, chloride diffusion, and chloride-induced corrosion are also observed in both HVS and HVS-FA concretes due to the addition of both nanomaterials. Among NS and NC, the concretes containing NC performed much better than the concrete mixes with NS. Significant extension of service life is also observed in both HVS and HVS-FA concretes by the inclusion of both nanomaterials.