ABSTRACT
This study aims to evaluate the permanent deformation of asphalt mixtures under field vehicle loads at urban intersections. In order to obtain the information of signal timing, rutting and traffic, a field investigation was conducted at urban intersections in Nanjing (Jiangsu, China). Five loading models were designed to simulate the load induced by buses crossing intersection at normal speed, deceleration, low speed, braking and jam. A Partial Triaxial Creep Test (PTCT) and 3-stage model was employed to characterize the permanent deformation of asphalt mixtures and to analyze the effects of loading models, loading levels, and additives on permanent deformation. Test results showed that the vehicle behaviors ranked by pavement damage is jam > braking > low speed > deceleration > normal speed. It is also shown that the pavement service life can be promoted by adding fiber or an Anti-rutting Agent (ATA) into asphalt mixtures.
