Tensile and Compressive Fatigue Characteristics and Viscoelastic Characterization of Reclaimed Asphalt Mixture

Based on the mathematical characteristic analysis of the dynamic modulus principal curve of asphalt mixture，the viscoelastic evaluation system of reclaimed asphalt mixture was established，and the physical parameters of viscoelastic behavior were also proposed. The viscoelastic difference between tensile and compressive directions was compared，the fatigue characteristics of reclaimed asphalt mixture in tensile and compressive direction were studied，and the relationship between fatigue properties and viscoelastic physical properties was established. The results show that，compared with the new asphalt mixture，the reclaimed asphalt mixture is elastic rather that viscoelastic，but it is effective viscoelastic enough under compression mode，and elastic rather that viscoelastic under tensile mode. Under the same loading mode（whether compressive or tensile），only the viscoelastic physical property parameter Reve has a high linear correlation with fatigue life Nf. When the loading mode is different，the linear relationship between Reve and Nf can not be established. © 2024 Tongji University. All rights reserved.