01/02/06: Astec Double Barrel's Unique Design is Ideal for RAP
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Astec Portable Double Barrel®
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The Double Barrel® dryer/mixer is a combination aggregate dryer and HMA mixer with high productivity and low operating costs. The Double Barrel's ability to run up to 50% RAP with no added emissions or fuel costs makes it especially valuable in today's market of fluctuating fuel and liquid AC prices.
Clean Operation
The unique design of the Double Barrel allows it to keep RAP and virgin aggregate separate until the mixing phase of production. While the virgin material is dried in the main drum, RAP is injected into the outer mixing chamber. Because the RAP never comes into direct contact with the hot gas stream of the dryer, the Double Barrel produces mixes with up to 50% RAP with no more blue smoke emissions than all-virgin mixes.
Energy Efficiency
Because of the Double Barrel dryer/mixer's unique double-drum design, virtually all heat produced by the burner is utilized in the drying and mixing process. Heat used in the superheating process is captured in the outer mixing chamber and utilized in the blending of mix materials..
Superior Mix Quality
When injected into the outer mixing chamber, RAP is heated by virgin aggregate that has been superheated in the inner drying chamber. This method has two benefits: excess moisture is removed from the RAP, and the reclaimed liquid asphalt partially coats the virgin aggregate. The mixing tip design and long mixing chamber of the Double Barrel create a consistent, high-quality product when liquid AC is added.
