Asphalt producers are using more recycled materials and opting for warm-mix asphalt technologies, according to a survey by the National Asphalt Pavement Association and the Federal Highway Administration.
The survey, conducted by the National Asphalt Pavement Association under contract to the Federal Highway Administration, found that 114 million tons of warm-mix asphalt was produced in 2014. This is a 7% upon 2013 and greater than 577% up on the use of warm mix since the survey was first conducted in 2009.
In the 2009 survey less than 5% of asphalt pavement mix tonnage was produced using warm-mix technologies; in 2014, it was more than 32.3%.
The survey also found that about 71.9 million tons of reclaimed asphalt pavement and 1.96 million tons of reclaimed asphalt shingles were used in new asphalt pavement mixes in the United States during in 2014.
Reclaiming and reusing the asphalt cement saved about $2.8 billion in 2013 compared to the use of virgin materials.
Producers were also asked about ground tire rubber, steel and blast furnace slag, and other waste material repurposed into pavements. Although national estimates of usage were not calculated, survey respondents reported using more 1.2 million tons of these materials in 2014 to produce more than 8 million tons of asphalt pavement mixes.
The survey was conducted in mid-2014. Results from 228 companies with 1,185 plants in all 50 states, along with data from State Asphalt Pavement Associations for 35 states, were used to compile the report.
A copy of the survey, including state-by-state appendixes can be downloaded from www.AsphaltPavement.org/recycling.