SULFUR MODIFIED ASPHALT FOR WARM MIX APPLICATIONS

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, sulfur, and non-surfactant additives based on wax chemistry. The compositions are capable of being performance graded and being used in warm mix asphalt applications.

主权项

1. A highly loaded sulfur-modified asphalt binder composition for use with asphalt concrete for improved properties relative to high temperature rotational viscosity without a reduction in dynamic shear properties, the asphalt binder comprising:
a. a polyphosphoric acid present in a range of up to 2 wt. % of the asphalt binder composition; b. a macromolecular polymer having a saturated backbone with macromolecular modifications being present in a range up to 5 wt. % of the asphalt binder composition; c. sulfur, the sulfur being present in a range of about 20 wt. % to about 50 wt. % of the binder composition, where the amount of sulfur being effective to at least partially emulsify in the composition; d. non-surfactant additives based on wax chemistry being present in an amount sufficient to provide a lubricating effect on the asphalt binder composition; and e. bitumen.