Two full-scale pavement sections built in 2012 at the National Center for Asphalt Technology (NCAT) Test Track were used to assess the structural contribution of cold central-plant recycling (CCPR) with 100% reclaimed asphalt pavement (RAP) and foamed asphalt as a recycling agent (CCPR-foam). The two test sections performed effectively, presenting no evidence of pavement damage during a two-year period of accelerated traffic loading in which 10 million equivalent single-axle loads (ESALs) were applied. Furthermore, ride quality was not significantly affected with the application of traffic. Frequent deflection testing over the duration of the study revealed that CCPR-foam exhibited a similar response to temperature as that observed for conventional asphalt concrete (AC). A procedure based on backcalculated modulus data was followed to determine the structural layer coefficients for the CCPR-foam layers. The layer coefficients were found to vary from 0.14 to (). Quantifying the structural coefficient allows this material to be effectively used in the AASHTO empirical method of pavement thickness design currently employed by many U.S. states.
Structural Coefficients of Cold Central-Plant Recycled Asphalt Mixtures
2017-02-24
Aufsatz (Zeitschrift)
Elektronische Ressource
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