Mix Design Practices for Warm Mix Asphalt





Mix Design Practices for Warm Mix Asphalt

Warm mix asphalt (WMA) refers to asphalt concrete mixtures that are produced at lower

temperatures than the temperatures typically used in the production of hot mix asphalt

(HMA) (50°F [28°C] lower or more). The goal with WMA is to produce mixtures with similar

strength, durability, and performance characteristics as HMA using substantially reduced

production

temperatures. There are important environmental and health benefits associated

with

reduced production temperatures including lower greenhouse gas emissions, lower fuel

consumption,

and reduced exposure of workers to asphalt fumes. Lower production temperatures

can also potentially improve pavement performance by reducing binder aging, providing

added time for mixture compaction, and allowing improved compaction during cold

weather

paving.


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