Research on the Preparation Process of SBS-Modified Asphalt Using Early Shearing Instead of High-Speed Shearing of Modifier

To investigate the effect of pre-shredding as a replacement for high-speed shearing in preparation process SBS-modified asphalt, particle size and mixing time pre-shredded SBS modifier were studied. Laser confocal microscopy was used to observe morphological changes dispersion state during process, parameters determined through rheological performance tests. FTIR tests conducted on original asphalt PAV-aged modified assess impact chemical composition aging resistance asphalt. The specific conclusions follows. During using low-speed mixing, can be summarized follows: It cycles edge networking, mesh fiberization, filamentous granulation, eventually presents granular atomization form after multiple cycles. is recommended that maintained between 30 60 min, which results microstructure consisting point-like combinations. This exhibited excellent high-temperature rut resistance, fatigue low-temperature crack resistance. When too long, formed small granules an atomized state, weakened strength structure led decrease overall performance. shredded into particles sized 18 or 100 mesh. with greater hardness structure, resulting better had extensibility leading superior medium-temperature Compared conventional preparing improved by 10% 13%. Additionally, prepared saved 1 3 h processing compared traditional method, reducing energy consumption. Furthermore, produced new performance, road wear saving maintenance costs.