Hot Times For Warm Mixes

摘要

Warm-mix asphalt (WMA) and recycled materials in asphalt (RAP) are the hot ticket on road projects, according to results of a survey by the National Asphalt Pavement Association under contract to the Federal Highway Administration. A survey of 1,141 U.S. asphalt plants found that they produced about 86.7 million tons of WMA during 2012 construction-almost a quarter of all asphalt mixes. This marks a 416% increase since a 2009 survey. Conducted in mid-2013 and released on Jan. 29, the study also found that about 68.3 million tons of RAP and 1.86 million tons of recycled asphalt shingles (RAS) were used in new mixes in the U.S. in 2012. The amount of RAP and RAS used by producers exceeded the amount collected.