Influence of viscoelastic properties of cold recycled asphalt mixtures on pavement response by means of temperature instrumentation

摘要

Cold recycled asphalt mixtures (CRAMs) have been widely used in pavement construction and rehabilitation of base courses. Some studies describe it as granular materials, without stiffness dependency regarding temperature or frequency variation, while other researches state that it resembles a viscoelastic material. This indicates that the CRAMs mechanical behaviour is not fully understood. In the present study, dynamic modulus tests were conducted with CRAMs samples and the master curves suggested a viscoelastic behaviour for this type of mixture. The dynamic modulus results were used as input data in 3D-Move Analysis software and the pavement structure was simulated at different temperature conditions based on temperature instrumentation data collected from the field. It was found that the temperature dependency of CRAMs' stiffness influences pavement mechanical behaviour. Besides, the relative stiffness between CRAMs and AC layers plays a major role in pavement response for varying temperatures. Therefore, CRAM's viscoelastic properties cannot be neglected.