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Home » Asphalt Contractor » March 2008
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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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After completing the project, Lehman-Roberts took a core sample of the warm mix asphalt and ran tests to compare those results against the hot mix control sample’s tests results taken from the airport application.

The warm mix design posted nearly identical results for AC content, gradation, theoretical gravity, bulk-specific gravity and air voids. Nuclear densities ranged from 91 to 94 percent for the warm mix, slightly less than the densities achieved at the airport, but Nelson expected this due to poor subbase conditions.

The warm mix design actually outperformed the control hot mix sample in the rut tests.

Overall, Lehman-Roberts was very pleased with these initial results.

“Aesthetically, there was no noticeable difference, and the mix remained very workable for a long period of time despite the cold ambient temperatures,” Nelson says. “The results from this one test showed the warm mix asphalt is at least as good as, if not better than the ‘normal’ mix.”

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