SBS改性硬质沥青钢渣SMA路面性能研究OA

The steel slag was used to replace the aggregate,and the SBS modified hard asphalt scheme was proposed to solve the problem of poor low temperature ductility of hard asphalt.The hard asphalt steel slag SMA mixture and SBS modified hard asphalt steel slag SMA mixture were prepared.Based on the conventional pavement performance test and immersion Hamburg wheel tracking test,the pavement performance and stability of SBS modified hard asphalt full steel slag SMA mixture were studied,and the applicability of SBS modified hard asphalt full steel slag SMA surface layer was verified by physical engineering.The results show that the steel slag SMA asphalt mixture exhibits superior high-temperature stability,low-temperature crack resistance,and fatigue performance compared to the diabase SMA asphalt mixture.The addition of SBS modifier significantly enhances the high-temperature stability and low-temperature crack resistance,thereby expanding the application range of hard asphalt.Furthermore,the use of modified asphalt and steel slag aggregates contributes to improving the high-temperature stability of SMA mixture under water-immersed loading conditions.Moreover,SBS-modified asphalt plays a decisive role in reducing rut depth,improving low-temperature crack resistance,and extending the fatigue life of SMA mixture.Field engineering verification confirms that the surface layer made of SBS-modified hard asphalt all-steel slag SMA mixture exhibits excellent pavement performance and skid resistance.After five years of service,the pavement condition rating is classified as"excellent"with significant economic benefits.