Warm-Mix Asphalt

Warm-mix asphalt (WMA) is the generic term for a variety of technologies that allow the producers of hot-mix asphalt (HMA) pavement material to lower the temperatures at which the material is produced at the HMA plant and placed on the road. Lowering the temperature of asphalt mixes decreases fuel usage, fumes, and greenhouse gas emissions, preserving resources while addressing growing environmental sustainability. Potential engineering benefits include better compaction on the road, the ability to haul paving mix for longer distances, and the ability to pave at lower temperatures.

For Further Reading:

MnROAD Phase II projects: Warm Mix Asphalt

2008 MnROAD Phase II Construction Report (3.5 MB PDF)

Warm Mix Asphalt: Best Practices (1.7 MB PDF)
(NAPA presentation, 2008)

An Introduction to Warm-mix Asphalt (36 KB PDF)
(NAPA paper, 2007)

Is ‘green’ the new look of pavement?
(Minnesota LTAP Technology Exchange)

Warm Mix Asphalt Technologies and Research
(FHWA website)

Warm Mix Asphalt: European Practice
(FHWA website)

Mix Design Practices for Warm Mix Asphalt
(NCHRP Project 09-43)

Engineering Properties, Emissions, and Field Performance of Warm Mix

Asphalt Technologies
(NCHRP project 09-47, 2009)

Properties and Performance of Warm Mix Asphalt Technologies
(NCHRP project 09-47A)

Related websites: