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Updated: July 8th, 2008 05:26 PM GMT-05:00

Lehman-Roberts Co. test drives warm mix asphalt

Producer encouraged by mix made with new foamed asphalt system.

The Tennessee Type E design is typically mixed at 310 degrees, but during the warm mix evaluation, Lehman Roberts made the mix at temperatures below 270 degrees.
The Tennessee Type E design is typically mixed at 310 degrees, but during the warm mix evaluation, Lehman Roberts made the mix at temperatures below 270 degrees.
Lehman-Roberts’ crews reported no visible smoke from the silo, truck or paver with the warm mix design.
Lehman-Roberts’ crews reported no visible smoke from the silo, truck or paver with the warm mix design.
With a compact design, the new warm mix asphalt system can be quickly retorfitted to asphalt plants in the field.
With a compact design, the new warm mix asphalt system can be quickly retorfitted to asphalt plants in the field.
A relatively simple design the new Terex warm mix asphalt system includes an expansion chamber with a customized pipe with up to 24 nozzles to deliver foamed asphalt to the drum. The system produces up to 500 tph of foamed asphalt.
A relatively simple design the new Terex warm mix asphalt system includes an expansion chamber with a customized pipe with up to 24 nozzles to deliver foamed asphalt to the drum. The system produces up to 500 tph of foamed asphalt.
With the aesthetics of the warm mix asphalt and test results for AC content, gradation, theoretical gravity, bulk-specific gravity and air voids showing virtually no difference to the hot mix design, Lehman-Roberts is encouraged with results.
With the aesthetics of the warm mix asphalt and test results for AC content, gradation, theoretical gravity, bulk-specific gravity and air voids showing virtually no difference to the hot mix design, Lehman-Roberts is encouraged with results.

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Seizing the opportunity

Lehman-Roberts’ opportunity to evaluate warm mix asphalt came just before the end of 2007. Company officials were approached by Terex Roadbuilding to test its new foamed asphalt approach. “Foamed asphalt just makes sense, and the nice thing about the Terex system is that it’s easily adapted to our plants and control systems,” Nelson mentions.

Once the decision was made to move forward with a field evaluation, Lehman-Roberts had to select which of the four Terex plants it owns would be retrofitted with the new system.

The warm mix asphalt field kit was installed on a 1992 Cedarapids/Standard Havens (now Terex) Magnum (inside-the-drum) counterflow asphalt plant.

“We were very excited about running the tests, since this was our first time working with warm mix asphalt,” Nelson says. “We wanted to educate ourselves on the foamed asphalt process and see if this would be a viable alternative to additives.”

Testing this new technology mirrors Lehman-Roberts’ progressive business philosophy and strategy. With its roots tracing back to Memphis in 1939, the innovative producer has grown to be a dominant player in western Tennessee and northern Mississippi.

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