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C.W. Roberts Brings Warm Mix to Fort Myers

In addition to making a variety of mixes including Superpave, C. W. Roberts new plant is capable of making warm mix asphalt, since the Florida DOT is encouraging contractors to make a change to warm mix where possible.

Even with the Florida economy in recession, C.W. Roberts purchased a new E3-400 counterflow plant fo fill internal demand and to develop an FOB market.

The first warm mix asphalt produced by the plant was run at 265 degrees F and burner positioning dropped from 55 to 40%. Initial estimates point to a savings of 0.8 gal per ton of fuel oil and 0.2 to 0.3% lower AC content in the warm mix.

After purchasing Cougar Contracting, C.W. Roberts saw an opportunity to expand the contractor's project base to include highway and interstate paving.

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After considering all of the factors, C. W. Roberts purchased a new Terex E3-400 counterflow drum mix plant, capable of producing up to 400 tons per hour. Also purchased were two EMS200, 200-ton silos with a DC-190 dragslat conveyor and truck scale and an RA418 baghouse offering up to 18,144 square feet maximum cloth area to meet environmental regulations.

Other components included two, 30,000-gallon vertical AC tanks; six-bin cold feed system; RAP system, complete with a screen and crusher; and energy center with Terex Impulse II Control System.

Setting this plant apart from the five others C. W. Roberts operates, the new E3-400 plant was purchased with the warm mix asphalt system already installed. It was also the first Terex plant ordered from the factory with the warm mix option.

"We have dozens of warm mix systems operating in the field, but those were field retrofits," says Steve O'Neal, asphalt plant district manager for Terex Roadbuilding.

The Terex warm mix system features single-point mixing of water and hot liquid asphalt. Upon exiting the expansion chamber, foamed asphalt is immediately injected into the drum to thoroughly and evenly coat heated aggregate. Proven to reduce mix temperatures by up to 90 degrees F, this system delivers production capacities reaching 600 tph.

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