Discrete Element Analysis of SCB Variability: Asphalt Mixtures.

摘要

The Semi-Circular Bending (SCB) test was modeled using the Discrete Element Method (DEM) implemented in numerical software Particle Flow Code (PFC). The fracture analysis of the SCB was studied using two mixtures gradation, Superpave and Coarse Matrix High Binder. The aggregate phase in the model was achieved by using two-dimensional aggregate images with different angularity indexes. The study of the variability of the SCB extends to the random generation of aggregate particles and air voids in the model, in addition to changing the properties at the interface between the aggregate and mastic phases. Results indicate the strong influence of the location of aggregates and air voids in the crack initiation and propagation. Moreover, the interface properties have a significant effect on the performance of asphalt mixtures. The SCB implemented in DEM can be considered as a repeatable cracking test based on the coefficient variation.