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FHWA reports on international scan focused on warm-mix asphalt.

In 2007, a team of 13 materials experts from the United States visited Belgium, France, Germany, and Norway to witness and evaluate warm-mix asphalt (WMA) paving technologies. FHWA recently released a report summarizing the results of the international scan tour.

According to the report, Warm-Mix Asphalt: European Practice (FHWA-PL-08-007), the benefits of WMA technologies include reduced fuel usage and emissions by the machines used to lay the asphalt when compared to hot-mix asphalt (HMA); improved field compaction, which can facilitate longer haul distances for the WMA and cool weather paving; and better working conditions compared to HMA due to the lower mix temperatures required by WMA that provide a more comfortable working environment.

Although adopting WMA for use in the United States will require modifications to existing materials and production practices, the scan team reported no long-term barriers to using the technology in this country. With additional research and trials, the team expects that State DOTs will adopt WMA, as an alternative to HMA.

To view the report, visit
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Title Annotation:Technical News
Publication:Public Roads
Article Type:Brief article
Geographic Code:1USA
Date:Sep 1, 2008
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