再硫化胶粉-SBS复合改性沥青的高低温流变性能试验分析OA

This paper aims to explore the performance recovery of desulfurized rubber powder in the desulfurized rubber powder-SBS composite modified asphalt after revulcanization treatment.By using 18%rubber powder-2%SBS composite modified asphalt,a desulfurized rubber powder-SBS composite modified asphalt was first prepared via a microwave pyrolysis desulfurization process.Subsequently,a vulcanizing agent was added to the system to prepare the revulcanized rubber powder-SBS composite modified asphalt.Experiments determined the optimal microwave pyrolysis desulfurization duration for rubber powder to be 5 min,and the optimal sulfur dosage was 6%by mass of the desulfurized rubber powder.A comparative analysis of the high-and low-temperature rheological properties of three composite modified asphalts(non-desulfurized,desulfurized,and revulcanized)shows that compared to the desulfurized rubber powder composite modified asphalt,the revulcanized rubber powder composite modified asphalt exhibits significantly improved viscoelasticity,deformation recovery rate,and deformation resistance under high-temperature conditions.Meanwhile,its deformation resistance and durability in low-temperature environments are also significantly improved,with all performance indicators restored to the levels of the non-desulfurized rubber powder-SBS composite modified asphalt.Infrared spectroscopy tests indicate that the addition of the vulcanizing agent restores C-S bonds and partially restores S-S bonds in the desulfurized rubber powder.These results confirm the effectiveness of revulcanization treatment in recovering the performance of desulfurized rubber powder-SBS composite modified asphalt,providing a theoretical basis and practical reference for related research and engineering applications.