ABSTRACT
ABSTRACT: Permanent deformation of bituminous layers, due to axle loading increase and the undisputable global increase of average air temperature, has become the major type of pavement’s distress in many countries. Each bituminous mixture to be used must have sufficient resistance to permanent or rutting deformation. Among other parameters, volumetric properties of the mixture are one of the major factors affecting the resistance to permanent deformation. The resistance to permanent deformation can be determined by the wheel tracking test. In this study, a dense asphalt concrete mixture (AC19) with 50/70 penetration grade bitumen was examined in terms of its resistance to permanent deformation by varying its volumetric properties. The wheel tracking test was carried out by two valid procedures as described in BS 598-110 and EN 12697-22. The volumetric properties of the mixture varied as a result of the binder content variation and the degree of compaction. The effect of testing temperature was also examined. Results showed that EN 2697-22 testing procedure detects better the effect of volumetric properties of asphalt concrete mixtures to their rutting performance. In terms of acceptability of mixture significant differences were found between the two testing procedures.
