A permanent deformation model of asphalt concrete based on shear properties isdeveloped and calibrated in this study. This model is extended and improved from anauthors’ previous work using laboratory tests results. Triaxial compressive strength (TCS)and repeated load permanent deformation (RLPD) tests on the three types of asphaltmixtures are performed at various loading and temperature conditions to correlate shearproperties of asphalt mixtures to rutting performance. It is observed from the tests resultsthat, for a given mixture, cohesion decrease with increase in temperature, while frictionangle is not significantly affected by temperature when testing temperature is 40°C orhigher. It is also found in the RLPD tests that loading and environmental conditions, suchas deviatoric stress, confining pressure, test temperature and load frequency, significantlyaffect the permanent deformation of asphalt mixtures and are needed to be incorporated inthe prediction model. Three different versions of the permanent deformation model basedon different input levels are proposed and verified using the tests data. Then, the model iscalibrated using an Accelerated Pavement Testing (APT) data set conducted on a typicalpavement structure at various temperatures. The proposed model can successfully predictthe permanent deformation of various asphalt mixtures in a wide range of loading andtemperature conditions without changing model coefficients.
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