Stress–Strain Curve and Carbonation Resistance of Recycled Aggregate Concrete after Using Different RCA Treatment Techniques

Five recycled coarse aggregate (RCA) treatment techniques including flow-through carbonation, pressurized wet nano silica (NS) pre-spraying and combined carbonation with NS pre-spraying, were utilized to improve the performance of concrete (RAC). The characteristics stress–strain curves RACs peak stress, strain, elastic modulus, ultimate strain toughness evaluated after using above RCA techniques. A theoretical model for natural was used analyse curve RAC. Additionally, resistance RAC different investigated. results showed that calculated based on matched well experimental results. Among three types techniques, caused highest improvement in stress modulus RAC, followed by last carbonation. method contributed even higher than method. exhibited enhancement because both new interface transition zone (ITZ) improved. improved all studied