FHWA and its partners are continuing to advance warm-mix asphalt, which can cut production costs and emissions and still provide long-lasting pavements. Modern performance requirements often dictate use of polymer-modified asphalt binders, strong angular aggregate, and greater in-place density of the HMA. Engineers typically use polymer modification as insurance against permanent deformation of a pavement at high surface temperatures on high-volume roads. The Federal Highway Administration (FHWA), in cooperation with the HMA industry, researchers, and academia, is continually exploring technological improvements that will enhance the performance, construction efficiency, resource conservation, and environmental stewardship of asphalt mixtures. The various asphalt mixtures are distinguished by the temperature ranges at which they are produced, and by the strength and durability of the final product. Development of WMA technologies began in Europe in the late 1990s, prompted by the German Bitumen Forum, a broad coalition of industry, labor, and government to address asphalt material issues.
|Original language||English (US)|
|Specialist publication||Public Roads|
|State||Published - Jul 2010|
All Science Journal Classification (ASJC) codes
- Geography, Planning and Development
- Civil and Structural Engineering