What is the environmental impact of lower temperatures during WMA production and placement?

• A. Less fuel consumption and reduced emissions
• B. Increased fuel consumption and emissions
• C. No change in emissions or fuel use
• D. Requires more energy

Answer: (A)

Lower temperatures in WMA reduce the amount of energy needed to heat and dry the aggregates and to heat the asphalt binder. With less energy to supply, less fuel is burned, which cuts emissions such as CO2, NOx, SOx, and particulates associated with asphalt production and placement. The lower evaporation of volatile components also means fewer fumes and odors, improving air quality around the plant and along the paving area. In short, using WMA at cooler temps generally lowers both fuel use and emissions compared with traditional hot mix asphalt, making it the more environmentally friendly option.