ABSTRACT

ABSTRACT: The deformation behaviour of four bituminous mixtures, containing 0, 30, 60, and 80% IBAA content, was investigated over a wide range of strain rates, stresses and temperatures under uniaxial monotonic compression test conditions. Two types of uniaxial test were conducted: the constant strain rate test and the constant stress test. The steady state axial strain rates and stresses were interpreted and used to identify the monotonic permanent deformation behaviour of the four mixtures. The radial strain and, hence, dilation of the four mixes were also measured. The uniaxial permanent deformation behaviour of the mixtures was found to have the same form as the relevant binders, which was evaluated in a previous study. Results showed that the aggregate matrix acted as stiffener. The IBAA content was found to have a noticeable effect on the mixtures’ permanent deformation behaviour. The uniaxial permanent deformation behaviour of the four mixes was modelled using the Modified Cross Model (MCM), which was found to capture the permanent deformation properties adequately.