Prediction of permanent deformation of asphalt concrete in cyclic and monotonic loading

New theoretical developments are presented to predict: the permanent deform ation in asphalt concrete caused by constant-load creep and by cyclic loads . The constitutive model utilizes multi-yield surfaces and isotropic harden ing. A new hardening law for the changes in the values of the plastic modul i during monotonic or cyclic loading is derived from Rows's stress-dilatanc y theory. A complete description of the permanent deformation of asphalt co ncrete under constant load creep and cyclic loading is given, including the elastic, viscoelastic, plastic, and microcracking components, to predict t he permanent deformation under cyclic loading. The model parameters have cl early defined physical meanings and fan be determined from simple conventio nal laboratory tests. A computer program called RUT determines the permanen t deformation. There is good agreement between the model predictions and th e experimental data.