Synergistic Effect of Micro-Silica and Recycled Tyre Steel Fiber on the Properties of High-Performance Recycled Aggregate Concrete

The present research investigates the mechanical and physical properties of recycled aggregate concrete (RAC) modified with micro-silica (MS) tire steel fiber (RTSF). Natural coarse aggregates (NCA) were completely replaced by (RCA) to prepare RAC. High-strength RAC mixes prepared replacing 5% 10% Portland cement MS. With each level MS, RTSF was incorporated as 0%, 0.5%, 1 2% volume fraction. In addition properties, ultrasonic pulse velocity (UPV), electrical resistivity (ER), water absorption (WA) also evaluated. performance mixtures compared plain natural (PNAC). experimental investigation revealed that substantially increased tensile strength RAC, whereas MS improved durability RTSF-reinforced made 1% showed 54% more splitting-tensile PNAC. WA capacity incorporating 15–22% lower than