Investigations of stiffness and fatigue properties of asphalt mixtures

摘要

Three conventional asphalt concrete mixtures containing one aggregate of a given size distribution and bitumens of different stiffness obtained from one and the same source are characterised with regard to rheological properties using uniaxial testing. Both non-destructive complex modulus and fatigue testing at different temperatures are performed. The results obtained from the non-destructive testing indicate that the mixtures studied exhibit similar rheological properties (stiffness and phase angle) in the range investigated, if compared at different temperatures (similar rheological state). The results presented also suggest that fatigue deterioration to a great extent is determined by the rheological status of the mixture. Some aspects on the test procedure, such as adequate strain measurement and heating during destructive (fatigue) testing as well as fatigue life characterisation using the classical approach, are discussed.