Crumb rubber modified asphalt (CRMA) is a high-performance binder for hot mix asphalt (HMA). CRMA contains asphalt blended with rubber from recycled tires (ASTM D-6114). During production, the tire rubber is finely ground at ambient temperatures and then blended with asphalt at temperatures exceeding 350ºF in a special rubber plant. The high temperatures cause the oils in the asphalt to swell as they blend with the elastomeric rubber polymer, resulting in a high-viscosity binder material that remains flexible at low temperatures and stiff at high temperatures. The tire rubber contributes polymer, carbon black, and anti-oxidants. The result is a very adhesive and cohesive high-viscosity binder that improves durability and resistance to oxidative aging, rutting, raveling, delamination, shoving, and thermal and reflective cracking.
Tri-Products' crumb rubber modified asphalt (CRMA) is formulated for high-performance applications. It can be manufactured in our Massachusetts plants (Holliston or Deerfield) or at the job site via one of our mobile blenders.
Our two mobile plants produce asphalt-rubber gap-graded (ARGG) and/or asphalt-rubber open-graded friction course (AROGFC) mixes in excess of 250 tons per hour.