Abstract:

The complex modulus, the phase angle, the wheel tracking factor and the fatigue factor of asphalt binder at the original state, at RTFOT state and at PAV state were tested by a dynamic shear rheometer. The creep stiffness and its time rate were tested by a bending beam rheometer. The results show that the wheel tracking factor of the SEAM modified asphalt binder with modifier mass fraction of 10% enhanced significantly, and the fatigue factor met the demands of the SHRP standard for asphalt binder. The creep stiffness of asphalt binder increased and its time rate decreased with the increase of the modifier content. From the obtained rheological index data it can be concluded that the SEAM modifier affects significantly the rheological properties of asphalt binder. The SEAM modifier with appropriate content(mass fraction about 10%) improves the rheological effect of asphalt binder, while the high content modifier(mass fraction more than 20%) stands opposite.

Key words: road engineering, SEAM modified asphalt, rheological property, dynamic shear rheometer, bending beam rheometer, contrast experiment