Sustainable Development of Fibre Reinforced Self-Compacting Concrete Using Recycled Coarse Aggregates

This study investigates the strength behaviour of fibre reinforced self-compacting concrete (FRSCC) incorporating recycled coarse aggregate (RCA) obtained from building demolition waste as a sustainable alternative to natural aggregates. The experimental program evaluates fresh and hardened properties of FRSCC mixes with RCA replacement levels ranging from 0% to 60%. Fresh concrete properties, including slump flow, T50, V-funnel, and L-box tests, were assessed in accordance with EFNARC guidelines to ensure adequate filling ability, passing ability, and segregation resistance. Hardened concrete performance was determined through compressive strength, split tensile strength, and flexural strength tests at 7 and 28 days. Results indicate that RCA replacement up to 35% provides optimum performance with minimal reduction in strength compared to conventional SCC. Beyond this level, workability and strength decreased gradually due to the higher water absorption and lower density of RCA. The addition of steel fibres improved post-cracking behaviour and ductility, contributing to enhanced structural efficiency. The findings highlight the potential of integrating self-compacting technology, fibre reinforcement, and recycled aggregates to develop environmentally sustainable and structurally reliable concrete.