To study the effect of super hard asphalt (SHA) on high and low temperature rheological properties of SHA modified binders

SHA was adopted as modifier to modify AH-90 pavement petroleum asphalt. Different proportions (5%

6%

7%

and 8%) of SHA binders were prepared

and dynamic shear rheology test

multiple stress creep-recovery test

and bending beam rheometer test were carried out. Results show that SHA modified binder conformed to time-temperature equivalence principle. The addition of SHA significantly improved the rutting factor of asphalt binder

indicating that the high temperature performance of asphalt binder was obviously improved. With the increase of SHA content

the average strain recovery rate of asphalt binder increased gradually

and the unrecoverable creep compliance decreased gradually

which means SHA is conducive to improving the high-temperature deformation resistance ability and elastic resilience ability of asphalt binder. With the incorporation of SHA

the variations of creep stiffness and creep stiffness change rate of asphalt binder were small

and the low-temperature anti-cracking performance of asphalt binder was little affected. Modified asphalt binder with SHA had excellent rutting resistance at high temperature

and its low-temperature performance remained unchanged with respect to PG classification of matrix asphalt.