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Pavement Preservation

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Updated: March 10th, 2009 10:49 AM GMT-05:00

Coughlin Provides Cold In-Place Recycling Solution

Preservation - CIR

Coughlin 3
Coughlin 4
The Roadtec 950-hp RX-900 cold planer propels every piece in the train.
Coughlin 5
The new RT-500 cold recycler - used on this job in its prototyping program - is designed to crush and screen the RAP produced by the RX-900, while its pugmill mixes the emulsion with the recycled materials.
Coughlin 6
A windrow loader, visible at the back of the train, picks up the material and feeds it to the paver, which puts the base material down according to spec.
Coughlin 7
The CIR process preserves natural resources by reusing 100 percent of the old HMA layer. This alleviates trips to a landfill, thereby reducing transportation costs and fuel emissions.

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The conveyors were outfitted with cleated belts for maximum production. A water spray system prevented dust buildup on rollers and the conveyors were covered for safety and to prevent roll off

Material that passed the screen dropped onto a 48-inch weigh belt. The belt's electronic scale, accurate to +/- 1 percent, communicated with the blending computer, which in turn adjusted the flow of additives that went into the RT-500's JCI/KPI Model 52 pugmill mixer. This twin shaft mixer had a capacity of 600 tph.

After a thorough mixing in the pugmill, the material was discharged in a windrow onto the roadway. The whole RT-500 system was run by electric motors powered by a Caterpillar C-9 generator set.

A windrow loader followed behind to pick up the material and feed it to a conventional paver. A heavy pneumatic, vibratory roller was used to compact the material to the required density.

Material specifications

Couglin recycled 100 percent of the existing material to construct the crack barrier. Mix designs could be as varied as conditions require.

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