Methods & compositions to increase performance of asphalt cement concrete comprising recycled asphalt pavement
AssigneeSurface Tech LLC
InventorsJoseph A. Dennis, Steven Santa Cruz, Phillip B. Blankenship
Life of this patent
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Abstract
The Present disclosure is related to hot-mix asphalt (“HMA”) for asphalt cement concrete (“ACC”) pavement. Equivalent-performing pavement may be made at lower cost, or higher-performing pavement may be made at equivalent-to-prior-art cost. The amendments, recycled asphalt pavement (“RAP”, and including recycled asphalt shingles [“RAS”]), and reinforcing fiber (aramid fiber) may be adjusted as described herein to achieve a desired price/performance target.
Claims20
A hot-mix asphalt (“HMA”) paving material comprising:
- an aggregate including at least 10% by weight of recycled asphalt pavement (“RAP”), the RAP including oxidized bitumen;
- asphalt binder;
- reinforcing fibers;
- and
- a liquid binder modifier that lowers a low-temperature Performance Grade (PG) of the asphalt binder by at least one grade.
A combination of additives for increasing performance of asphalt cement concrete (“ACC”) pavement made with at least 10% recycled asphalt pavement (“RAP”) containing oxidized bitumen and asphalt binder (virgin bitumen), comprising:
- a first quantity of aramid fibers having lengths between 20 mm and 80 mm;
- and
- a second quantity of a liquid binder modifier that lowers the asphalt binder low temperature grade of the ACC by at least one grade.
Dependencies are inferred from the claim text.