EFFECT OF STEEL FIBRES ON SELF- COMPACTING CONCRETE WITH PARTIAL REPLACEMENT OF FLY ASH WITH OPC 53 COMPACTING CEMENT

Abstract

This study investigates the mechanical properties of fiber-reinforced self-compacting concrete (SCC) with partial replacement of Ordinary Portland Cement (OPC) 53 with fly ash. Fly ash was substituted at levels of 0%, 15%, 20%, and 25% to examine strength variations. Hooked steel fibers, with a diameter of 0.4mm and length of 30mm (aspect ratio of 75), were added at 0.75% by weight to improve the concrete’s performance in terms of bending, impact, and compressive strength. The fresh-state properties of SCC, including filling ability, passing ability, and segregation resistance, were evaluated using slump, V-funnel, and L-box tests. Hardened concrete properties, such as compressive strength, split tensile strength, and flexural strength, were also assessed. Findings highlight that fiber inclusion enhances crack control and durability, though it impacts flow ability in heavily reinforced areas.