Abstract

ABSTRACT: The steady-state deformation behaviour of a standard pure bitumen and two types of asphaltic mixtures has been studied. The steady-state deformation behaviour of the bitumen is found to be linear at low stress levels and non-linear power law creep at high stress levels. The steady-state deformation behaviour of both mixtures is found to be well captured by the Modified Cross Model which predicts linear viscous behaviour at low stress levels and non-linear viscous behaviour at high stress levels. The temperature dependency of the steady-state deformation behaviour is found to be well captured by the WLF equation. It is found that confinement has a stiffening effect on the steady-state deformation behaviour which is found to be higher for the continuously graded mixture.