| Product and recycled content | Recycled Asphalt (RAP); 100% RAP |
| Application | Improvement of a gravel utility road. Recycled asphalt was selected in preference to maintaining the virgin aggregate surface or building a conventional hot-mix asphalt road. |
| Location/Date | Roads Division utility road, 1994 |
| Project manager/user | John Maddock, Paving Supervisor Roads Division, (206)296- 8188 |
| Architect/Engineer | None |
| General Contractor | None |
| Background, history | Wanted to find a cheaper alternative to conventional hot mix and something more permanent and less dusty than gravel. |
| Performance | Recycled asphalt is applied cold and compacted; ambient summer heat softens liquid asphalt in the aggregate and compaction hardens the surface. |
| Source of material | Lakeside Industries-Kent plant |
| Quantity | Approximately 2500 tons for the road and approximately 500 tons for recycle building area |
| Cost | $5.00 ton at plant versus $27.50 for hot mix |
| Cost savings or increase | Less expensive than conventional hot mix and gravel; life- cycle is approximately three years for top inch of surface, and three-five years for three-inch base course |
| Installation, costs/savings | Installation is the same as hot mix asphalt concrete |
| Source of extra funds | No extra funds needed, costs less |
| Would you buy this product again? | Yes. |
| Why or why not? | Better than a gravel road, less expensive than a hot mix application |
| Comments | After two years, the top of the road surface shows signs of ravelling and
pot holes. This same material was also used for a sub surface layer in the recycle building apron, driveway and parking lot. |
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