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Take advantage of the savings realized through the use of recycled
asphalt pavement (RAP) with Astec RAP systems. The systems are offered
in a range of configurations, with a variety of conveyors, screens,
grizzlies and crushers. The simplest system consists of one bin, a
scalping screen and a conveyor that goes directly to the drum mixer.
The RAP system can be portable, stationary or relocatable. Options include bulkheads, wing walls, screens and grizzlies.
Materials separated by a screen can be crushed. Some
systems can then separate lumps, break them up, and deliver that
material to the drum along with the portions that passed through the
screen.
Applications
Asphalt Mixing
A thermal mixing process is required to turn aggregates and liquid AC into an asphalt pavement mix for road construction. This makes an asphalt mixing plant necessary for road construction. The complete line of Astec asphalt mixing plants, and its range of capacities and features, gives you the choices and flexibility to create your optimum solution.
The collecting conveyor runs under the belt feeders to collect material
from all the bins. The tail section unbolts, then easily reattaches to
the collecting conveyor extension when adding future bins. The upturned
end empties onto a scalping screen (if used) or onto an incline
conveyor.
Belt Feeders and Idlers
You can assure accurate mix formulas with variable-speed belt
feeders. They let you change the production rate while keeping the mix
formula unchanged. Each feeder is powered by a vari- able speed motor
with a Danfoss® controller and Sumitomo® right angle reducers. These
drives provide precise control of belt speed.
Troughing idlers are standard with Astec conveyors. The
troughing design results in a longer belt life and reduces material
spillage. The troughing idler belt is supported on nine-inch (22.56 cm)
centers. Flat idlers are optional.
Head pulleys on both are covered with rubberized traction material that makes firm contact and moves the belt without slippage.
Inclined Conveyors
Inclined conveyors with rubber belts take the aggregate from the cold
feed unit RAP bins to the drum mixer. The inclined conveyor is
available in relocatable, stationary or portable designs.
Most often, the inclined conveyor incorporates a scalping
screen at the front end. On portable units, a transfer conveyor is used
as the deck selector on two-deck screens. Pneumatically activated belt
scrapers are standard on every Astec inclined conveyor. A walkway can be
added as an option.
Bin Vibrators
Dancing plate bin vibrators provide better material flow than common weld-on vibrators.
Belt Scales
A load cell in the belt scale accurately indicates the weight of a
section of belt running over a weigh idler. Load cell information,
combined with the belt speed, shows how much material is entering the
drum mixer. The scale includes a remote operated test weight for easy
calibration. As material is run across the scale, a sample is routed to a
truck via the cylinder operated drum bypass chute, then veried on a
truck scale. All Astec belt scales come with wind guards to maximize
accuracy.
High-Density Polyethylene Liners
Optional high-density polyethylene liners can be installed inside the
bins for added wear protection. Liners also significantly reduce the
friction between bin walls and material, producing ultra smooth material
flow.
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