Mechanical Properties of Recycled Aggregate Concrete Modified with Nanosilica and its Bonding Properties with Steel Bars

To improve the performance of recycled concrete materials and structures and achieve the widespread application of recycled concrete technology, this study comprehensively analyzes the influence of different concentrations of nanosilica-modified recycled aggregates on the mechanical properties of recycled concrete and its bonding performance with steel bars. These results indicate that nanosilica can significantly improve the performance of recycled aggregates, and the mechanical properties of recycled aggregate concrete, thereby enhancing the bonding performance between recycled aggregate concrete and steel bars (which was mainly reflected in the increase in bonding strength the increasing slope and the reduction in bonding slip). As the concentration of the nanosilica solution increases, the improvement effect of the nanosilica shows a trend of first increasing and then decreasing. In addition, a relationship model between the concentration of nanosilica and its bonding performance is established.