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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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One of the hottest topics in the asphalt industry today has to do with a cooling trend for mix temperatures. Warm mix asphalt has generated much buzz among associations, government agencies, equipment manufacturers and asphalt producers since being introduced in the United States approximately five years ago.

Advancements made in the technology and positive field test results for warm mix asphalt projects were a primary focus at the January 2008 National Asphalt Pavement Association Conference in Phoenix.

And why not? Many key industry officials have long been promoting the potential benefits for producers using the new mixing processes to lower temperatures by 50 to 75 degrees F.

These probable advantages include: the opportunity to save on fuel costs; burning fewer volatiles at lower temperatures to increase mix quality; the chance to expand the paving season for the northern two-thirds of the country; and lower emissions and no blue smoke offering the promise of being able to make mix in large metropolitan districts previously designated as non-attainment areas.

The greatest benefit of them all, however, may be the fact that warm mix asphalt can be used for virtually any mix design - base, intermediate or surface.

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