Method of using porous aggregate in asphalt compositions
Porous aggregates are coated with latex or water-based paints so as to lower the absorbility of the aggregates. When the paint-coated aggregates are mixed with an asphalt binder to produce an asphalt composition, the paint-coated aggregates absorb less of the asphalt binder, resulting in costs savings of the asphalt binder. In addition, the paint-coated aggregates avoid problems associated with selective absorption of components of the asphalt binder.
1. A method of reducing the amount of asphalt binder used when producing an asphalt composition which comprises:
providing a porous aggregate;
coating the porous aggregate with a paint selected from latex paint or water-based paint to form a paint-coated aggregate;
drying the paint-coated aggregate; and
mixing the paint-coated aggregate with an asphalt binder to produce an asphalt composition,
wherein the paint-coated aggregate absorbs less of the asphalt binder than a similar non-paint-coated aggregate.
2. A method of reducing the amount of asphalt binder used when producing an asphalt composition according to claim 1 , wherein the paint-coated aggregate absorbs up to about 55 wt. % less of the asphalt binder than the similar non-paint-coated aggregate.
3. A method of reducing the amount of asphalt binder used when producing an asphalt composition according to claim 2 , wherein the paint-coated aggregate absorbs from about 15 to about 50 wt. % less of the asphalt binder than the similar non-paint-coated aggregate.
4. A method of reducing the amount of asphalt binder used when producing an asphalt composition according to claim 1 , wherein the porous aggregate has an absorption rate of greater than 1%.
5. A method of reducing the amount of asphalt binder used when producing an asphalt composition according to claim 1 , wherein the porous aggregate comprises a natural aggregate.
6. A method of reducing the amount of asphalt binder used when producing an asphalt composition according to claim 1 , wherein the porous aggregate comprises an artificial aggregate.
7. A method of reducing the amount of asphalt binder used when producing an asphalt composition according to claim 6 , wherein the porous aggregate comprises a slag aggregate.
8. A method of producing an asphalt composition which comprises:
providing a porous aggregate having an absorbility;
coating the porous aggregate with a paint selected from latex paint or water-based paint to lower the absorbility of the porous aggregate
and provide a paint-coated aggregate; drying the paint-coated aggregate; and mixing the paint-coated aggregate with an asphalt binder to produce an asphalt composition.
9. A method of producing an asphalt composition according to claim 8 , wherein the paint-coated aggregate absorbs up to about 55 wt. % less of the asphalt binder than the similar non-paint-coated aggregate.
10. A method of producing an asphalt composition according to claim 9 , wherein the paint-coated aggregate absorbs from about 15 to about 50 wt. % less of the asphalt binder than the similar non-paint-coated aggregate.
11. A method of producing an asphalt composition according to claim 8 , wherein the porous aggregate has an absorption rate of greater than 1%.
12. A method of producing an asphalt composition according to claim 8 , wherein the porous aggregate comprises a natural aggregate.
13. A method of producing an asphalt composition according to claim 8 , wherein the porous aggregate comprises an artificial aggregate.
14. A method of producing an asphalt composition according to claim 13 , wherein the porous aggregate comprises a slag aggregate.
15. An asphalt composition which comprises a paint-coated porous aggregate and an asphalt binder.
16. An asphalt composition according to claim 15 , wherein the paint-coated aggregate absorbs less of the asphalt binder than a similar non-paint-coated aggregate.
17. An asphalt composition according to claim 15 , wherein the porous aggregate comprises a natural aggregate.
18. An asphalt composition according to claim 15 , wherein the porous aggregate comprises an artificial aggregate.
19. An asphalt composition according to claim 15 , wherein the porous aggregate comprises a slag aggregate.
20. A pavement formed from the asphalt composition of claim 15 .