Aggregate of asphalt and filler
AssigneeCarsonite International Corporation
InventorDonald W. Schmanski
Life of this patent
Estimating the term…
Abstract
An asphalt pavement material comprising an aggregate mixture of asphalt, gravel, sand and a pelletized composite of recycled rubber and thermoplastic material. The pelletized composite has a uniform size, smaller than the gravel and larger than the sand and is configured to fit within interstitial voids between the gravel. Sufficient pelletized composite is added to the asphalt pavement and mineral aggregate mixture (replacing mineral aggregate of comparable size) to substantially fill void spaces between the gravel.
Claims4
A method for preparing an asphalt paving material from asphalt, gravel and sand, said method comprising the steps of:
- a) reducing recycled rubber to rubber particles having a size within the range of -16 to +6 mesh;
- b) combining the rubber particles with flowable polymer binder to form an uncured composite having from 30% to 50% (w) rubber content with 70% to 50% (w) binder;
- c) extruding the composite to form pellets having a size suitable for at least partially filling interstitial voids between gravel particles within the pavement material;
- and
- d) mixing sufficient pellets with asphalt, gravel particles and sand to form a substantially uniform aggregate suspension wherein the pellets migrate with smaller sand particles into the interstitial voids between the gravel particles to form a compactable pavement material which is stable in heat and weatherable in cold environments.
Dependencies are inferred from the claim text.