October 7, 1999
The purpose of this paper is to familiarize the reader with
the paving material asphalt-rubber (A-R) by providing historical
perspective on its development and obstacles to its development.
A-R has been a constant and stable market for crumb rubber producers
in the United States most significantly within the vicinity of
Arizona, California, and Florida. Agencies use A-R because of
the engineering benefits it provides but also find that it contributes
to the reduction of waste tires.
Additionally, an overview of tire program management in the key
states of Arizona, California and Florida will be included. Government
tire programs have been required to control the flow and disposal
of waste tires. A fee structure has been required to remediate
waste tire piles and to add value to waste tires for processors.
Fees have been used to provide equipment to processors and to
stimulate the production of beneficial end uses of tires. As
markets develop and piles are eliminated, fees can be reduced.
Regulations that focus on only one beneficial end use are typically
not successful. All environmentally economical options should
be included.
Stable crumb rubber markets encourage the development of new
technologies that utilize the material. One emerging technology
is a spray application to existing highway sound barriers that
is crumb rubber based. Crumb rubber has a notable sound energy
absorbing characteristic and is relatively inexpensive. This
sprayed material is applied in thin layers approximately one
quarter of an inch in thickness. The bonding materials experimented
with to date have been synthetic stucco mud with crumb as the
aggregate and a paint like polymer liquid.
Asphalt-Rubber is not the solution to the waste tire problem,
but when utilized by agencies that prefer its beneficial engineering
characteristics such as durability, flexibility, strength, and
resistance to cracking, it contributes significantly to the reduction
of waste tires.
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Rubber
Pavements Association
1801 South Jentilly Lane, Suite A-2
Tempe, AZ 85281 USA
480.517.9944
480.517.9959 fax
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