Aggregate enters the drum through an inlet chute designed to keep material flowing.

A look at Astec state-of-the-art flighting from the aggregate end.

A view of combustion flights located near the burner end of the dryer.

The aggregate temperature is measured as it leaves the inner drum through the aggregate exit openings with reinforced wear plates.

Free Flow Into The Drum

The drying process begins when the virgin aggregate enters the inner drum through a rubber seal and gravity chute. The seal restricts air entry into the drum while allowing the aggregate to pass through. The angle of the clad lined inlet chute keeps material flowing freely into the drum.

Flights Serve Three Functions

Three different types of flights move the material through the drying chamber. They are especially designed for three separate functions.

• Conditioning flights break up any clumps or sticky material as the aggregate enters.
• Showering flights make sure that the material is veiled evenly through the hot gas stream.
• Combustion zone flights prevent aggregate from impinging on the flame while spreading the material to maximize radiant heat transfer.

Measure Actual Temperature

Once heated and dried, the aggregate leaves the drying chamber and enters the mixing chamber.

At this point, an infrared sensor measures the temperature of the hot aggregate and automatically adjusts burner output to keep aggregate at the required temperature.

This unique Astec feature makes it easier for you to control mix temperatures and to turn out mixes that conform to specifications.

Control Systems

TCII or PMII systems control and monitor proportional control of aggregate feeders and the blending of asphalt, recycle, shingles, and additives. Both systems work with WM2000 which controls silo load out, inventory, and sales transactions. Upgrade to TCII controls for more flexibility and expansion options.