Sterol blends as an additive in asphalt binder
AssigneesA.L.M. Holding Company, Ergon Asphalt & Emulsions, Inc.
InventorsGerald H. Reinke, Gaylon L. Baumgardner, Andrew Hanz
Life of this patent
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Abstract
Disclosed are asphalt binder compositions and methods for making such compositions with pure sterol:crude sterol blends. The sterol blends improve various rheological properties.
Claims20
A method for retarding the aging rate of aged asphalt binder comprising:
- adding a sterol blend comprising a mixture of pure sterols and crude sterols to an asphalt binder composition, wherein the asphalt binder composition comprises a virgin asphalt binder and the aged asphalt binder, wherein the aged asphalt binder comprises a reclaimed asphalt binder, wherein the sterol blend comprises about 10-90 wt. % crude sterol and wherein the sterol blend is about 1 wt % to about 10 wt % of the virgin asphalt binder.
An asphalt pavement comprising aggregate, an asphalt binder composition comprising i) a virgin asphalt binder and ii) an aged asphalt binder comprising reclaimed asphalt pavement and/or reclaimed asphalt shingles, wherein the asphalt binder composition further contains a sterol blend comprising pure sterol and crude sterol, and wherein the sterol blend is about 1 wt % to about 10 wt % wt % of the virgin asphalt binder.
Dependencies are inferred from the claim text.