IT’S NOT HOT — IT’S NOT COLD — it’s WARM mix! European countries are using technologies that allow a reduction in the temperatures at which hot mix asphalt is producedand placed. These technologies have been labeled Warm Mix Asphalt (WMA) and have caught the attention of producers and specifying agencies in the United States. The initial benefit of producing WMA is the reduction in energy consumption required to heat traditional hot mix asphalt (HMA) to temperatures in excess of 300° F. These high production temperatures are needed to allow the asphalt binder to become viscous enough to completely coat the aggregates in the HMA, provide good workability during laydown and compaction, and durability during traffic exposure. With its decreased production temperature, WMA affords the additional benefit of a reduction of emissions and fumes generated at the plant and the paving site.

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