Compactasphalt Can Place Two Layers in Single Pass

Mon June 02, 2008 - National Edition

Compactasphalt, developed by Dynapac, allows the simultaneous laying of two different layers in a single pass. Both the upper asphalt layers — the wearing and binder courses — are laid and compacted simultaneously “hot-on-hot.”

As a result, the new concept provides a better interlocking of the two courses ensuring increased life expectancy, higher deformation resistance and lower maintenance costs, according to the manufacturer.

Compactasphalt features a paver with two separate material hoppers for both asphalt mixes and a special unit to convey the wear course material to a second screed. The new system comprises the add-on module AM300 to contain the wear course mix. It is mounted onto a high performance F300CS paver together with the second screed.

The wear course mix is fed by a special feeding system of the new MF300C tracked feeder into the second material container on the paver.

When required for conventional paving duties the AM 300 module can be easily dismounted any time.

The hopper for the lower layer — generally the binder — has a capacity of 50 tons (45 t). The hopper for the wearing course is 30 tons (27 t).

The use of mobile feeders allows a continuous movement of the paver, improving the surface evenness. Due to the simultaneous compaction of both the wearing and binder courses, a linkage between the courses occurs, generating a monolithic upper layer.

Featuring a standard 9.8-ft. (3 m) paving width up to a maximum 52-ft. (16 m) width, the paver can achieve a paving speed of 0 to 65.6 ft. per minute (0 to 20 mpm).

Reduced Construction Schedules

The compact construction method is suited for large construction works, according to the manufacturer.

A laying capacity 4,409 to 5,511 tons (4,000 to 5,000 t) per day and up to as much as 8,818 tons (8,000 t) per day ensures a shorter construction time, which is crucial for highly trafficked highways.

Asphalt laying also is possible when using the new technique into a later season of the year at temperatures of less than 0 C.

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