Sustainable Self-Compacting Recycled Aggregate Concrete Incorporating Industrial Byproducts and Agricultural Waste: Rheological, Strength, and Durability Properties

Self-compacting concrete is a cutting-edge innovative material known for its excellent flowability and cohesion, enabling the optimal filling of structural components and reinforcement voids. However, its high cement and natural coarse aggregate usage contributes to elevated CO₂ emissions and resource depletion. This study addresses these environmental concerns by exploring sustainable alternatives, using recycled coarse aggregates at ratios of 50 and 100%, along with supplementary materials such as brick powder, micro silica, rice husk ash, and hydrated lime (H). The impact of these materials on the rheological properties of self-compacting recycled aggregate concrete (SCRAC) like slump flow, J-ring, and V-funnel. The strength and durability of SCRAC with up to 40% mineral admixture replacement with and without H. The analysis demonstrated a 20% increase in compressive strength, a 30% reduction in chloride ion penetration, and controlled carbonation depths below 20 mm, ensuring superior performance and durability comparable to the reference SCRAC. Additionally, these mixes demonstrated lower carbonation depths and significantly higher rapid chloride penetration test than the reference SCRAC, reducing the risk of steel reinforcement corrosion. The study confirms the viability of using industrial biowaste ashes in SCRAC production, with H acting as an effective realkalizer for the cement matrix.