Rubber Asphalt Study for Wisconsin
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2020-10-01
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Edition:Final Report September 2018 – October 2020
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Abstract:This study investigated the usage of ground tire rubber (GTR) in Wisconsin asphalt pavements. A special provision (SPV) was drafted outlining mix design guidance when using terminal and dry process GTR. The SPV also included a performance testing regime including Hamburg Wheel Tracking, Disk-Shaped Compact Tension (DCT), and Illinois Flexibility Index (I-FIT) tests. Short and long-term aging was also performed on DCT and I-FIT samples to determine long term performance. Test strips were constructed on USH 51 consisting of a control, terminal blend, terminal blend hybrid, and dry process sections. A preliminary pavement distress survey was performed to quantify pavement distresses before construction of the overlay test sections. After the construction of the test section, approximately 1 year later, another pavement distress survey was performed. A cost benefit analysis was performed comparing bid prices with improved performance compared to the control. All GTR mixtures showed varying degrees of increased performance and may be an option for WisDOT when implementing a future Balanced Mix Design (BMD) approach to asphalt mixtures.
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