United States Department of Transportation
i
Characterization and Modeling of Recycled Pavement Sections
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2017-12-01
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[PDF-1.20 MB]
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Edition:Final Report
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Abstract:Because of its documented cost and environmental benefits, cold central plant recycling (CCPR) has attracted the interest of local and state departments of transportation. In 2015 two test pavement sections with CCPR as base layers were constructed at the Accelerated Pavement Testing facility located at the Virginia Tech Transportation Institute. The intention of this study is to investigate the effect of different overlays on CCPR material under accelerated loading. The two test sections (four test cells) had similar structures, but one lane was overlaid with a dense graded asphalt surface mixture of 76 mm (3 inches) while the other lane had only 38 mm (1.5 inches) of the same mixture. The CCPR base was 127 mm (5 inches) thick in both lanes. Pavement responses (longitudinal strain and vertical pressure) and vertical permanent deformation at the pavement surface were monitored throughout testing. The distribution of pressure versus depth showed that the thinner surface layer led to a steeper reduction of pressure in the surface and CCPR layers, which could produce increased rutting over time. Based on laser profiler measurements, rutting depth developed differently between the two lanes, as well as between the two test cells within the same lane. An empirical model was developed to compensate for the age effect in order to fairly evaluate the rutting performance of the different pavement sections. After being normalized by the model, the rut depth in the lane having the 76-mm (3-inch) surface layer was 62% of the rut depth in the lane having the 38-mm (1.5-inch) surface layer.
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