Use of sterols from animal waste 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 that contain at least one sterol or stanol additive, or blends of sterols and stanol additives, wherein the sterol or stanol additive is derived from an animal waste or manure source such as swine manure. These sterol and stanol-based additives improve various rheological properties of the asphalt binder compositions showing reduced and/or mitigated aging characteristics.
Claims20
An asphalt binder composition comprising virgin asphalt binder, reclaimed asphalt binder material comprising reclaimed asphalt pavement, reclaimed asphalt shingles, or combinations of both and 0.5 to 15 wt. % of an anti-aging additive based on the virgin asphalt binder, wherein the anti-aging additive comprises at least one animal waste-derived sterol or stanol additive.
A method for slowing the aging of or restoring aged asphalt binder comprising adding an anti-aging additive comprising at least one animal waste-derived sterol to an asphalt binder composition, wherein the asphalt binder composition comprises a virgin asphalt binder, reclaimed asphalt binder material comprising reclaimed asphalt pavement, reclaimed asphalt shingles, or combinations of both.
A method for retarding the aging of, or restoring, aged asphalt binder comprising adding at least one first sterol and at least one second sterol to an asphalt binder composition, wherein the asphalt binder composition comprises a virgin asphalt binder, aged asphalt binder, or combinations of both, and wherein the first and second sterols comprise a 10:90 to 90:10 weight ratio blend of first sterol to second sterol, and wherein at least one sterol is derived from manure.
Dependencies are inferred from the claim text.