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Home » Asphalt Contractor » March 2008
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Updated: July 8th, 2008 05:26 PM EDT

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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Producers are partnering with industry associations and government agencies to expand field evaluations of a variety of warm mix asphalt technologies available in the market. However, one of the primary road blocks keeping some producers from moving forward with warm mix asphalt is cost.

Some industry estimates put as much as a $4 per-ton premium for some of the additives on the market … not a welcomed expense on the heals of historic price increases for liquid asphalt.

“As a producer, we have avoided warm mix asphalt additives because the higher costs are less desirable for us and our customers,” explains Patrick Nelson, director of information technology and special projects for Lehman-Roberts Company, Memphis, TN.

This is not to say that Lehman-Roberts is not interested in warm mix asphalt. On the contrary, Nelson explains that the company has been following and studying the technology since it was first introduced to the United States.

“We have spoken with several producers who have run warm mixes,” he adds. “We feel there is a spot for it in the Memphis market.”

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