ANSYS RESEARCH ON VIBRATORY COMPACTING PROCESS OF HOT ASPHALT MIXTURE PAVEMENT

In order to study the mechanical behavior and deformation characteristics of a hot asphalt mixture compacting process, this paper studies the vibratory compaction mechanism of asphalt mixture, and establishes three-degree-of-freedom equations of a roller nonlinear model and a mechanical model of the pavement vibratory compacting process using ANSYS software. Since mixture deformation is associated with the rate of the stress-strain behavior of nonlinear creep, this paper analyzes the complex creep parameters of the MTS compaction test using nonlinear regression of Origin software, from which the creep parameters under 0.6MPa different load cycle are obtained. The mixture plastic flow is significant and becomes irreversible deformation. A greater c1 leads to more obvious creep and greater plastic deformation, while a smaller c3 leads to smaller creep and plastic flow. The results demonstrate that the plastic deformation of hot asphalt mixture increases rapidly due to vibratory impulses, with permanent deformation making mixture compacted after unloading and form a ‘frame-dense’ structure. The mixture is not compacted after a certain loading times. Therefore, the mixture can only be effectively compacted under certain temperature range and compaction power.