Crude sterol as an additive in asphalt binder
AssigneesA.L.M. Holding Company, Ergon Asphalt & Emulsions, Inc.
InventorsGerald H. Reinke, Gaylon L. Baumgardner, Andrew Hanz
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Abstract
Disclosed are binders and methods for making such binders with crude sterols. The crude sterols improve various rheological properties of the binders. The disclosure provides a method for slowing the aging rate of aged asphalt binder comprising adding a crude sterol to an asphalt binder, wherein the asphalt binder comprises both virgin asphalt binder, and reclaimed asphalt binder material comprising asphalt pavement (RAP), asphalt shingles (RAS) or combinations of RAP and RAS.
Claims16
A method for slowing the aging rate of aged asphalt binder in a paved surface comprising:
- adding a crude sterol comprising at least 13.5 wt. % sterol molecules to an asphalt binder composition, wherein the asphalt binder composition comprises 60 wt. % to about 95 wt. % of a virgin asphalt binder, from about 5 wt. % to about 40 wt. % reclaimed asphalt binder material obtained from aged pavement comprising asphalt pavement (RAP) at binder replacement levels 20% and greater, asphalt shingles (RAS) at a binder replacement level 1% and greater or combinations of both and from 0.5 to 15 wt. % of the crude sterol based on the virgin asphalt binder,
- combining the asphalt binder composition with aggregate to provide paving mix, and
- applying the paving mix on a base surface to provide the paved surface with slower aging rate.
Dependencies are inferred from the claim text.