Mohammad Hasan Tabatabaee - Lenjan Branch, Islamic Azad University, Lenjan, Iran.
Mehran Iranpour - Lenjan Branch, Islamic Azad University, Lenjan,

Three different types of storage stability of SBS modified asphalts were investigated by hot storage test. It’s found that during hot storage the performance of SBS modified asphalt deteriorated although phaseseparation didn’t happen. Mechanism of storage stability of SBS modified asphalt was discussed. The different hot storage stability of three SBS modified asphalts could be well interpreted with the interface layer principle. Based on the interface layer principle, a new way that asphalt was chemically modified bySBS was put forward to improve hot storage stability and other using performances. The results indicated that the asphalt chemically modified by SBS had good hot storage stability and other using performances were significantly improved. Fluorescence microscopy was used to study SBS modified asphalt phase morphology, and the SBS chemically modified asphalt showed two interlocked continuous phases.

Modified asphalt; SBS; Hot storage stability; Chemical modification; Phase morphology