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US 2019/0153229 A1Published application
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
Life of this patent
Estimating the term…
Abstract
Disclosed are binders and methods for making such binders with crude sterols. The crude sterols improve various rheological properties of the binders.
Claims20
A method for slowing the aging or restoring aged asphalt binder comprising:
- adding a crude sterol to an asphalt binder, wherein the asphalt binder comprises a virgin asphalt binder, reclaimed asphalt binder material comprising asphalt pavement (RAP), asphalt shingles (RAS) or combinations of both and from 0.5 to 15 wt. % of the crude sterol based on the virgin asphalt binder.
A method for reusing reclaimed asphalt binder for asphalt binder pavement production, comprising:
- adding a crude sterol to an asphalt binder, wherein the asphalt binder comprises a virgin asphalt binder, reclaimed asphalt binder material comprising asphalt pavement (RAP), asphalt shingles (RAS) or combinations of both and from 0.5 to 15 wt. % of the crude sterol based on the virgin asphalt binder.
(canceled)
The method of claim, 2 further comprising adding aggregate to the asphalt binder.
(canceled)
A method for identifying an anti-aging additive comprising:
- (a) determining a ΔTc for an asphalt binder after aging;
- (b) determining a ΔTc for an asphalt binder that is the same as the asphalt binder in (a) but with an anti-aging additive;
- (c) comparing the ΔTcs after aging of the asphalt binder with and without the anti-aging additive;
- and
- (d) identifying the anti-aging additive that provides a higher ΔTc after 40 hours of PAV aging of at least 25% higher than the asphalt binder without the additive or a higher ΔTc after 60 hours of PAV aging than the asphalt binder without the additive.
2 more elements
Dependencies are inferred from the claim text.