The aim of the reported study was to relate the field deformation (rutting) rate of asphalt mixes to the properties of the binders used to manufacture them. A series of mixes with the same aggregate composition but different binders was placed and the asphalt sections trafficked using the Accelerated Loading Facility (ALF). The deformation rate under an 80 kN wheel load was measured at two temperatures. The binders were tested in the laboratory using a dynamic shear rheometer (DSR) and routine binder testing equipment. The DSR provided useful information over a range of temperatures and loading frequencies and identified a phase change undergone by the one of the binders between 40 and 45 degrees Celsius. The ratio (Energy between 40 and 45 degrees Celsius. The ratio (Energy absorbed/cycle or pulse)/(Energy stored elastically/cycle or pulse) was found to be a binder parameter which gave a good indication of the deformation resistance of the asphalts. Binder consistency and softening point also correlated reasonably well with asphalt deformation rate. (A)
Samenvatting