Development of guidelines for usage of high percent RAP in warm-mix asphalt pavements.
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2011-12-15
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Edition:Final report; 11/01/2010-11/25/2011.
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Abstract:Road construction using warm-mix asphalt has been rapidly gaining popularity in the United States, in part because
WMA is believed to be friendlier to the environment as compared to hot-mix asphalt. Parallel to this rapid growth in
WMA construction is utilization of reclaimed asphalt pavement (RAP) in road construction. Research was conducted
to develop guidelines for using high percentages of RAP in WMA. The laboratory work was focused on three WMA
technologies: water foaming, a chemical additive (Evotherm™), and an organic additive (Sasobit™). The work
included RAP characterization, mix design, moisture damage evaluation, and rutting evaluation using the Superpave
Shear Tester and Model Mobile Load Simulator Third Scale. Accelerated load testing was conducted at a
temperature range of approximately 42 to 50°C for 400,000 cycles of loading. Rutting resistance of the mixes was
rated as fair to good. This research indicates that it is possible to produce WMA with high RAP having sufficient
moisture damage and rutting resistance. However, a mix design established for HMA does not necessarily produce
satisfactory performance when used with WMA, and it is important that moisture damage and rutting susceptibility of
WMA be evaluated for any mix design, even though that mix design may have demonstrated satisfactory
performance for HMA.
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