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Fast Facts on Quiet Pavement
- Rubberized asphalt uses the rubber from scrap tires to provide a smooth,
quiet ride and a durable pavement surface, which benefits drivers
and residents living near freeways.
- Rubberized asphalt contains about
20 percent tire rubber that is blended into a liquid asphalt
mixture.
- On Valley freeways, a one inch
layer of rubberized asphalt will be applied on top of the existing
12 to 14 inch thick concrete pavement.
- Approximately 1500 tires per lane
per mile will be recycled by paving Valley freeways with a one-inch
rubberized asphalt overlay.
- Approximately 75% of freeway noise
is generated from tires, and rubberized asphalt reduces that
noise at its source.
- Studies have shown that rubberized
asphalt can reduce traffic noise levels by an average of 4 decibels.
- The frequency range that moving
vehicle tires produce while rolling on rubberized asphalt is
lower than with concrete surfaces, reducing the higher pitched
frequencies that tend to be more irritating to homeowners and
freeway drivers.
- ADOT is considered a pioneer in the use of rubberized asphalt in paving projects
with more than 4.2 million tons of rubberized asphalt paved on Arizona highways
since 1988.
- ADOT has invested $225 million in rubber asphalt paving projects since 1988.
- An estimated 15 million tires (plus) have been recycled since 1988 by paving
Arizona highways with rubberized asphalt.
- The application of rubberized asphalt is sensitive to temperatures, meaning that
paving in the Phoenix area is limited to the spring and fall seasons –
March 15 through May 31, and September 1 through November 15. The concrete
pavement surface needs to be between 85 and 145 degrees Fahrenheit for the
material to adhere properly.
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