Methods and compositions to increase performance of asphalt cement concrete comprising recycled asphalt pavement
AssigneesSurface Tech LLC, Bakelite Chemicals 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”) which open new price/performance areas to 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 (virgin bitumen);
- reinforcing fibers;
- and
- a liquid binder modifier that lowers the asphalt binder low temperature grade of the aggregate by at least one grade, wherein
- the aggregate is to be placed and compacted by a paving machine to form a smooth surface.
A suite of materials 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.