Numerical investigation on viscoelastic response of asphalt mixture under tire braking slip

Abstract

A three-dimensional (3D) viscoelastic asphalt pavement, of which the surface was composed of asphalt mixture, was developed using ABAQUS and a moving 3D tire-pavement contact stress with different braking slip ratios was incorporated and programmed into ABAQUS by FORTRAN language. Five braking slip ratios were considered (Dual Tire Assembly (DTA): 0 (free rolling), 1.8%, 3.6%, 5.4%, and 7.0% (full braking); Wide Base Tire (WBT): 0 (free rolling), 1.5%, 3.0%, 4.5%, and 7.0% (full braking)). Results showed that the viscoelastic stress and strain of the asphalt mixture were significantly influenced by tire braking slip ratio and pavement temperature for both DTA and WBT loading conditions. As the slip ratio and the temperature increased, the stress and strain of the asphalt layer would increase and their positions shifted upwards to the surface of the asphalt layer. Comparatively, the peak shear strain was the most significantly influenced factor and its amplitude may increase by 10 times. However, the bottom strain of the asphalt layer was far less affected by tire breaking behaviours.

Keywords

• Asphalt mixture
• Viscoelastic response
• Tire contact
• Braking slip