Resource utilization and performance evaluation of solid waste materials in road engineering

To clarify the application feasibility and practical effects of waste fly ash as a filler in asphalt pavement materials, this study selected two types of waste fly ash as the primary filler. Asphalt mastics with different fly ash contents were prepared using a high-speed melt shearing method. The interaction and compatibility between the asphalt binder and waste fly ash were characterized by scanning electron microscopy. The rheological properties of the waste-fly-ash asphalt mastics were analyzed using a dynamic shear rheometer. The influence of waste fly ash content on the pavement performance of asphalt mastic was systematically examined through three major index tests. The results indicate that replacing a portion of pure mineral filler with varying amounts of waste fly ash does not reduce the adhesion of the asphalt mastic. The addition of waste fly ash not only effectively enhances the high-temperature stability of the mastic but also improves resistance to shear deformation.