About WMA
Warm Mix asphalt: The wave of the future?

Warm-mix asphalt allows the producers of asphalt pavement material to lower the temperatures at which the material is mixed and placed on the road. Reductions of 50 to 100 degrees Fahrenheit have been documented. Such drastic reductions have the obvious benefits of cutting fuel consumption and decreasing the production of greenhouse gases.

In addition, research at the National Center for Asphalt Technology and elsewhere has shown that lowering the production temperature can drastically reduce the production of emissions. By cutting emissions, warm-mix asphalt improves conditions for workers and enhances relationships with neighbors.

NAPA first brought warm-mix technology to the United States from Europe in 2002, spurring intense interest among hot-mix asphalt producers, contractors, researchers, and government agencies. Since that time, new technologies have been developed in the United States.


Numerous warm-mix asphalt demonstration projects have been constructed around the country. In addition, research at NCAT includes several test sections on the NCAT Test Track. The Federal Highway Administration is partnering with NCAT on this research, both by providing funds and by supporting innovative approaches to warm mix.

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