Survey reveals recycled tire rubber often in asphalt
The results of a survey by the Rubberized Asphalt Foundation (RAF), a research foundation dedicated to the science and practical use of recycled tire rubber in asphalt pavements, revealed that 70 percent of transportation agencies have previously used or currently use recycled tire rubber in asphalt. About half of the respondents indicate that they have a specification for using recycled tire rubber.
The survey was conducted for RAF by the Highway Sustainability Research Center at the University of Massachusetts Dartmouth and was distributed to 152 transportation professionals, including members of each state transportation agency, the Federal Highway Administration and other government agencies.
Agencies have utilized recycled tire rubber routinely for crack sealing (30 percent), chip seals (26 percent), dense-graded hot mix asphalts (15 percent), joint sealants (15 percent), stress absorbing membrane interlayers (11 percent) and open-graded friction courses (11 percent). Other respondents reported the same uses for rubberized asphalt on an experimental basis.
Another aspect of the survey noted the predominate technology currently being used for incorporation of the rubber is terminal blending. It is being chosen 59 percent of the time.