Evaluation of the Combined Effects of Reclaimed Asphalt Pavement (RAP), Reclaimed Asphalt Shingles (RAS), and Different Virgin Binder Sources on the Performance of Blended Binders for Mixes with Higher Percentages of RAP and RAS
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2015-11-01
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Abstract:As virgin material sources become increasingly scarce, and the volume of pavement material that is routinely recycled increases, it becomes more desirable to use significantly higher amounts of RAP and RAS for pavement construction. The California Department of Transportation (Caltrans) has recently increased the allowable RAP content to 25 percent in asphalt mixes. Caltrans-industry-academia task group has proposed increasing the RAP and RAS percentages to allow binder replacement up to 40 percent. Virgin binders from different sources blend differently with the age-hardened oxidized binder in RAP and RAS. There are concerns that depending on the source of the virgin binder, the rheological properties of the blended binder could vary appreciably that will result in highly variable cracking performance. The University of California Pavement Research Center has proposed and studied a methodology to evaluate the effect of RAP and RAS without extraction and recovery by testing of the fine aggregate matrix (FAM) using solid torsion bar fixture with the dynamic shear rheometer (DSR).
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