Evaluation of field-produced hot mix asphalt (HMA) mixtures with fractionated recycled asphalt pavement (RAP) : 2007 Illinois tollway field mix trials.
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2008-10-01
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Alternative Title:2007 Illinois tollway field mix trials.
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Edition:Project report, 2007-2008
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Abstract:To test the fractionated recycled asphalt pavement (FRAP) materials, the Illinois Tollway, working through its
contractors and consultants, developed and conducted a project on the applicability and feasibility of using
increased RAP contents through FRAP. The goal of the program was to answer two main questions:
• Can the Tollway design, produce, and construct high-quality HMA pavements with high FRAP content
mixes?
• Will these materials provide the same or better pavement performance as the standard mixes used by
the Tollway and Illinois Department of Transportation (IDOT), and with performance that is consistent
with pavement design procedures?
In the summer of 2007, a construction contract was awarded for advance pavement work on the Jane Addams
Memorial Tollway (I-90) in the Rockford area. The timing, scope, and circumstances of the I-90 project provided
a rare opportunity to evaluate several different HMA concepts directly via plant mixing and field trials. This is a
summary report of the field trial production mixes containing high quantities of FRAP sponsored by the Illinois
Tollway.
The results of these field trials show that the Tollway can design, produce, and construct high-quality HMA
pavements with high FRAP content mixes. Further, the laboratory evaluation of these mixes shows that their
performance is expected to be similar to currently used materials and consistent with current pavement design
procedures. The issue of asphalt cement grade bumping was evaluated with the field trials and, based on these
results, there is no need to double bump the asphalt cement grade within the design criteria.
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