Influence of Viscoelastic Properties of Asphalt Mixtures on the Structural Response of Pavements
In order to explore the influence of anisotropy on viscoelastic pavement structure,the study carries out dynamic modulus test,determines the performance parameters of the mixture under anisotropy,and establishes a finite element model to analyze the mechanical response of the pavement structure.The conclusions are as follows:with the increase of temperature,the indicators of tensile strain at the bottom of the layer,tensile stress at the grass-roots level,compressive strain at the top surface of the subgrade increase,and compressive strain at the top of the layer decreases.The mechanical indexes of the viscoelastic pavement structure are greatly affected by temperature and loading frequency,and the change of the asphalt layer bottom tensile strain indexes can be up to 10 times when the temperature is increased from 5 ℃ to 50 ℃;and the tensile strain at the bottom of the layer decreases by about 1/3 when the loading frequency is increased from 5 Hz to 25 Hz,which is the more significant effect of temperature in comparison.There are great differences in the response of pavement structure based on isotropic and anisotropic conditions.
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