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Abstract:Since 1993, the Oregon Department of Transportation (ODOT) has been monitoring performance of seventeen rubber modified
asphalt and asphalt concrete sections constructed on Oregon highways. The study originated in response to the Intermodal Surface
Transportation Efficiency Act (ISTEA, 1991) which mandated the use of tire rubber in pavements. The ISTEA requirement was
eventually repealed, however, the study continued to document pavement performance in an effort to determine if rubber modified
asphalt concrete pavements are feasible in terms of construction and life cycle cost.
The rubber modified sections that performed the worst included those constructed using the dry process (rubber modified asphalt
concrete—RUMAC). The sections performing the best included open graded mixes constructed using the binder PBA-6GR (a rubber
modified asphalt). After five years, the PBA-6GR pavements were performing as well or better than the control sections. The cost of
the mixes constructed in 1993 and 1994 with PBA-6GR was about 12% more than the control sections. Over the life of the pavement,
the terminal blend asphalt rubber (PBA-6GR) may be cost effective.
This report documents the performance of the rubber modified and control sections including distress information, skid and ride data
and laboratory testing results. In addition, non-ODOT projects were reviewed and discussed.
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