Astec Double Barrel^® X Drum Mixer

The Double Barrel X system separates the drying process from the mixing process to ensure proper mix quality and ease of drum maintenance.

After the heated and dried virgin aggregate thoroughly mixes with the RAP and fines, it passes out of the drum dryer/mixer and moves into an external pugmill. This is where liquid AC is added. Because the liquid AC only enters in the external mixer, virtually no build-up is produced in the dryer. With the addition of an optional Astec warm mix system, the Double Barrel X system produces warm mix asphalt.

Counter-rotating mix paddles of the external coater/mixer pugmill.

A large hydraulically operated access door allows easy service of mixing shanks and tips from the outside of the drying drum.

4″ thick insulation under the outer skin of the mixing chamber minimizes heat loss and increases efficiency. In addition, temperature-resistant ceramic fiber insulation is used in critical high-heat areas.

Thrust rollers on either side of the tire restrain the drum.

Adjustable steel trunnions with railroad duty bearings.

Provides greater uniformity of the aggregate veil through the gas stream during the drying process, across a wide variety of mix designs and tonnage rates.

The v-shaped notch allows material to start pouring out of the bucket at the beginning of each revolution. The material in the bucket continues to pour out until the rotation is complete. This is what provides an even veil of material. The v-flight is also larger than a traditional flight, allowing it to carry the same amount of aggregate even with the notch.