What is Warm Mix Asphalt (WMA)?
How is it different from Hot Mix Asphalt (HMA)? In the simplest of terms, warm mix asphalt is the combination of aggregates and liquid asphalt, just like hot mix asphalt. However, WMA requires less heat to produce than HMA due to the incorporation of an additive to the mixing process. These additives, of which there are currently four on the market, appear to reduce the viscosity of the liquid asphalt at a given temperature. As a result, the liquid asphalt coats the aggregates at reduced temperature compared to HMA.
