Production, experimental investigation of SCC using fly ash and granite debris

Abstract

The proportion of fly ash (30%) was fixed in the second phase, whereas the proportion of granite debris (up to 60%) was changed. Thus, for the second phase, a comprehensive investigation for Fly Ash (FA) blended SCC containing various amounts of Granite Debris (GD) was conducted by performing fresh, mechanical and durability properties of concrete. The microstructure of concrete samples were evaluated using electron scanning microscopy (SEM). Prepared FA mixed SCC compositions was further tested for impact resistance, fire resistance, and economic and environmental properties. The FA blended SCC mixes were compared to those of conventional SCC mixture made using Ordinary Portland cement (OPC). The results of the second phase suggested that adding up to 40% GD to a fly ash blended SCC mixture improved mechanical performance. The replacement of samples with 50% of GD was found to improve the durability properties (such as resistance to chemical ingress and water penetration) and impact resistance. The use of up to 60% GD in a FA blended SCC mixture was found to improve resistance to chloride attack and fire attack. Though fly ash blended SCC mixtures had worse mechanical performance than the OPC-based control SCC mixture at up to 90 days curing, they had superior mechanical performance at 180 days and 365 days curing than the OPC-based control SCC mixture.