Performance graded sulfur modified asphalt compositions for super pave compliant pavements

摘要

Disclosed herein are an asphalt concrete mixture, an asphalt binder composition, and methods of preparing the related compositions. The asphalt binder compositions include a polyphosphoric acid, a macromolecular polymer having a saturated backbone with macromolecular modifications, and sulfur. The compositions are capable of being performance graded.

主权项

1. An asphalt concrete composition having high sulfur load with improved properties relative to high temperature rotational viscosity without a reduction in dynamic shear properties, the asphalt concrete composition comprising:
a binder comprising:
a polyphosphoric acid, the polyphosphoric acid being present in an amount effective to provide high temperature stiffness for the composition;a polymer having a saturated backbone with macromolecular modifications, the polymer being present in an amount effective to provide sufficient lubrication for the composition;sulfur being present in a range of from about 20 wt. % to about 50 wt. % of the binder; andasphalt; and an aggregate selected from the group consisting of coarse filler, fine filler, mineral filler, and combinations thereof.