Application of a novel linear-viscous approach to predict permanent deformation in simulative inverted pavements

Ahmed, Imtiaz; Thom, Nick; Zaidi, Syed Bilal Ahmed; Muñoz, Juan Sebastián; Rahman, Taqia; Dawson, Andrew

doi:10.1016/j.conbuildmat.2020.120681

Cited by 7 publications

(1 citation statement)

References 29 publications

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“…Although aggregates, which are a type of rigid material, account for approximately 90% of all components within the asphalt mixtures, such mixtures exhibit complex rheological properties. Asphalt mixtures exhibit both viscous (fluid) and elastic (solid) behavior [ 1 , 2 , 3 ], and their mechanical properties are highly dependent on temperature, loading stress level, loading time, and loading speed [ 4 , 5 ]. The theoretical and experimental studies on the mechanical behaviors of asphalt mixtures provide a crucial basis for designing pavement layers [ 6 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

Viscoelastic Damage Characteristics of Asphalt Mixtures Using Fractional Rheology

Zhang

et al. 2021

Materials

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The mechanical behavior of asphalt mixtures at high stress levels are characterized by non-linear viscoelasticity and damage evolution. A nonlinear damage constitutive model considering the existence of creep hardening and creep damage mechanisms in the entire creep process is proposed in this study by adopting the fractional rheology theory to characterize the three-stage creep process of mixtures. A series of uniaxial compressive creep tests under various stresses were conducted at different temperatures to verify the model. The results indicated that the model predictions were in good agreement with the creep tests. The relationship between the model parameters and applied stresses was established, and the stress range in which the mixture exhibited only creep consolidation was obtained. The damage to the asphalt mixture was initiated in the steady stage; however, it developed in the tertiary stage. A two-parameter Weibull distribution function was used to describe the evolution between the damage values and damage strains at different stress levels and temperatures. The correlation coefficients were greater than 0.99 at different temperatures, indicating that a unified damage evolution model could be established. Thus, the parameters of the unified model were related to material properties and temperature, independent of the stress levels applied to the mixtures.

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