Binder Performance Indicators for Rutting: Evaluation of Experimental Correlations With Tests on Asphalt Concrete

As the development of new European test methods for performance related binder properties is advancing, the validation of these binder properties and associated test methods has become a question of high priority. The purpose of the present research work was to compare binder properties, believed to be indicators for rutting, on the basis of the experimental correlation obtained with asphalt concrete rutting tests. A selection of 12 binders was considered. These binders were subjected to extensive rheological testing in the low frequency range, to determine the so-called ZSV (zero shear viscosity) and viscosity at low shear rates, as well as the rutting indicators according to Superpave. In addition, the RSCT (repeated shear creep test) and constant creep tests at low shear rates were also carried out. A dense asphalt concrete mix was used to evaluate the impact of the binder on rutting. Two independent tests were carried out to evaluate the sensitivity of an asphalt concrete mix to permanent deformation. This paper discusses correlations observed between binder tests and both asphalt mixture tests respectively. It is shown that some of these binder parameters can be used for specification purposes at elevated service temperatures.