MODELING OF THE VISCOELASTIC BEHAVIOR OF PAVING BITUMEN USING FRACTIONAL DERIVATIVES

摘要: The paving grade bitumen used in the production of asphalt mixtures for road construction is significantly able to affect in-service performances flexible pavements. It has been proved that, when subjected loading conditions comparable with most pavement operating conditions, bituminous bind ers behave as linear visco-elastic materials. aim this paper propose a mo del based on fractional differential equations which describe behavior binders visco- elastic range. Shear creep testing and recovery were carried out over range temperatures by applying stress level makes it possi ble maintain response studied bitumens within region. shown that tests follow power decay law, rather than an exponential one: follo ws appropriate operator describing constitutive law fr actional operator. procedures determine model's parameters from experimen tal data are discussed.