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US 11,168,214 B2Granted
Method for identifying the extent of aging in an asphalt
AssigneesA.L.M. Holding Company, Ergon Asphalt & Emulsions, Inc.
InventorsGerald H. Reinke, Gaylon L. Baumgardner, Andrew Hanz
Life of this patent
Estimating the term…
Abstract
Disclosed are asphalt and asphalt binders and methods for making such compositions with sterols. The sterols improve various rheological properties. Also disclosed are methods of determining the changes or improvements of various rheoloical properties.
Claims20
A method for identifying the extent of aging in an aged asphalt binder and slowing the aging of the aged asphalt binder comprising:
- analyzing the aged asphalt binder for surface defects using atomic force microscopy;
- and
- adding amounts of an anti-aging additive comprising sterol or stanol and a virgin asphalt binder to the aged asphalt binder, wherein the anti-aging additive slows the aging rate of the asphalt binder composition compared to an asphalt binder composition without the age-retarding additive.
Dependencies are inferred from the claim text.