Research on the Application of Steel Slag AR-SMA-13 Asphalt Mixture in Airport Pavement

This article proposes to use steel slag instead of some coarse aggregate to prepare asphalt mixture to improve the performance of airport asphalt pavement. The physical and mechanical properties of steel slag and diabase aggregates were compared and analyzed. The microscopic morphology and pore structure characteristics of steel slag and diabase were tested and analyzed by SEM and MIP. The high-temperature stability of steel slag asphalt mixture was studied by rutting test. The low-temperature crack resistance performance of steel slag asphalt mixture was evaluated using dual indicators of failure strain and bending stiffness modulus. The water stability of steel slag asphalt mixture was studied through freeze–thaw splitting test combined with pull-out test; the improvement mechanism of road performance was analyzed from a microscopic perspective. The research results indicate that steel slag can be used as coarse aggregate for airport asphalt pavement. The optimal ratio of steel slag to asphalt mixture is 50%. Steel slag asphalt mixture can significantly improve the high-temperature resistance to rutting of airport asphalt pavement, improve the low-temperature cracking resistance and water stability of the pavement. The good road performance of steel slag asphalt mixture may be attributed to the unique microstructure and the chemical reactions between steel slag and asphalt.