Rubberized asphalt is an alternative to traditional road paving material, made by blending crumb rubber (finely ground recycled tires) into an asphalt mixer. This mix is then placed and compacted into a road surface. Rubberized asphalt has proven to be cost-effective and resilient, with reduced maintenance requirements and better skid resistance compared to conventional asphalt. It also has been recognized for its reduction of traffic noise.
Liberty Tire Recycling’s crumb rubber is used in paving projects across North America, diverting tires from landfills or illegal disposal.
Transportation departments in the Southwest United States have been using asphalt rubber for several decades, and it has successfully reduced pavement rutting; improved skid resistance, ride quality and durability; and lowered noise levels on and nearby the highways.
Rubberized asphalt surfaces significantly reduced traffic noise on urban highways in Arizona when compared to adjacent aged Portland cement concrete surfaces.
The Arizona Department of Transportation developed this pilot program in cooperation with the Federal Highway Administration. After about one year it was determined that asphalt rubber overlays resulted in up to 12 decibels of road noise reduction, with a typical reduction of 7 to 9 decibels.