Low Emission Asphalt is produced using the low energy process. This process relies on sequential mixing of the asphalt binder containing a chemical additive being added to the hot coarse aggregates, followed by the introduction of wet sand which creates a foaming action. The wet sand fraction, which could be as high as 40% of the total mixture and could contain 0–100% RAP, is unheated in this process. It should be noted that sand (or fines) carries the most moisture, subsequently requiring the most amount of energy to dry. With a desired mix discharge temperature of around 200 degrees Fahrenheit, the Low Energy Process provides the greatest reduction in energy consumption of all the available processes. Energy inputs are optimized throughout the manufacturing process through the use of a control module and energy management model.
(courtesy of lea-co.com)