The Pyropaver 300E is the only two stage, hot in-place asphalt recycling system available today. Contractors operating in the United States, Canada, Mexico, Sweden and Korea have purchased the Pyropaver 300E system.

The system provides a proven method of recycling asphalt to a depth of 2" and with the ability to add rejuvenates and virgin asphalt if and as required. Although it is often used as a stand-alone maintenance alternative, the design engineer may also use the Pyropaver 300E to recycle the bottom lift and place virgin hot mix for the final lift.

The Pyropaver 300E is referred to as a two-stage system as the heating and milling process is accomplished by two heating and milling units that operate in tandem. This process ensures the heat required to achieve the 2" depth does not degrade the asphalt content, often experienced with single stage systems. It is the proper softening ofthe bottom 1 to 1 1/4" that yields material as rich as new mix, and when combined with the upper 1 ", in the pugmill, results in a mix that compares well with original material, requiring little or no rejuvenate in most cases.

The Pyropaver 300E system, often referred to as a "train" consists of;

PREHEATER
Excess surface moisture interferes with the efficient heating of recycled asphalt pavement. Therefore, the asphalt surface is preheated to remove excessive moisture prior to the main heating and milling process.

This is accomplished by a preheater unit, trailered behind a 1500 U.S. gallon capacity propane supply 5 ton truck. The truck is equipped with two 80/40 propane vaporizers. The preheater utilizes high air flow burners fired horizontally, one foot above the pavement, into an insulated steel enclosure designed to dissipate the moisture while heating the entire lane width. Four hydraulic cylinders are utilized to raise and lower the burner system as required. Rubber tired wheels are used for trailering and are replaced by steel wheels for operation. Emissions are naturally aspirated through exhaust stacks into an emissions combustion chamber where unburned hydrocarbons are incinerated prior to discharge

Measurements: Truck - 30'' x 8'' x 10''; Preheater - 26'' x 12''6" x 13''
Weights: Truck - Front axle: 12,000 lbs.; Rear axle: 21,000 lbs.; Shipping weight: 17,000 lbs.; Operating weight: 28,000 Ibs.; Preheater: - Rear axle: 10,000 Ibs.; Shipping weight: 17,000 Ibs.; Operating weight:17,000 lbs.

UNIT "A"
Unit "A" is a self-propelled machine which employs banks of propane-fired, nickel cadmium, infrared heaters to heat a full lane-width of asphalt to a depth of 1 to 1 114". The units two parallel 5'' rotating milling heads remove the upper I" of softened asphalt from each side of the lane and windrows the material to the center of the lane.

A computer controlled 1,300 gallon rejuvenate dispensing system, linked to the forward speed of the unit, is located on Unit "A" and provides the ability to add rejuvenate to comply with specified application rates required by the contract.

Measurements: Traveling - 57'' x 10''6" x 13''; Operating - 57'' x 12''6" x 12''6"
Weights: Front axle: 30,000 lbs.; Rear axle: 44,000 lbs.; Shipping weight: 56,000 lbs.;Operating weight: 62,000 lbs.
Engine: Caterpillar 3306B

UNIT "B"
Unit "B" immediately follows Unit "A" and is pushed by the track paver. This unit employs a 4'' milling head and drag-slat conveyor to pick up the windrow from Unit "A" and transports the material over the heater banks of Unit "B", dropping it in front of the Pugmill, mounted at the end of Unit "B".

The infrared heaters of Unit "B" then heats the newly exposed asphalt to a depth of 1 to 1 /4" and a 12'' milling head removes the lower layer of asphalt, windrowing it with the material from Unit "A". The full-width milling head operates with automatic grade controls, adjustable on both sides which provides for reshaping or reprofiling of the pavement surface.

Unit "B" is equipped with a front-mounted Hopper which meters new mix or coated aggregate into the drag-slat conveyor relative to the speed of the unit, according to design requirements.

A Pugmill attached to the rear of Unit "B" then picks up the windrow, which includes material from Unit "A" and "B", and any new material, and thoroughly mixes it prior to elevating it into the paver hopper and unmediate re-application to the highway surface.

Measurements: Traveling: 49'' x 10''6" x 12''6"; Operating: 49''3" x 13''1" x 12''6"
Weight: Front axle: 27,000 lbs.; Rear axle: 38,000 lbs.; Shipping weight: 54,000 lbs.; Operating weight: 62,000 lbs.
Engine: Caterpillar 3406B

Other technical features include all axle steering on both units; emission control systems on the preheater and Units "A" and "B"; ease of dealing with castings and manholes; conversion to mobilization status within 30 minutes; and fuel capacity providing for full-day operation without interruption.

The productivity of the Pyropaver 300E depends on asphalt condition, depth of operation as well as ambient and surface temperatures. These factors impact on heat penetration which, in turn, determines the speed of operation. On average, the system has the ability to recycle to a depth of 2" at a speed of 20'' per minute or approximately 2 lane miles a day.