Abstract
Aggregate shape properties is one of the factors that determine the packing conditions of asphalt mixtures. The influence of aggregate shape properties was evaluated by utilising aggregates in three shapes, namely cubical, blade, and disk. Three shape parameters, namely sphericity, shape factor, and roundness, were defined to quantify the shape properties of the aggregates. Herein, the influence of aggregate shape on the packing of porous asphalt mixture (PAM) was evaluated via comparative studies of PAM’s mechanical properties in laboratory measurements versus discrete element method (DEM) algorithmic simulations. PG-76 binder was used in the PAM, with compaction by a gyratory compactor. Simulation models of PAMs were built in Particle Flow Code in 3 Dimensions (PFC3D) algorithm simulation. The results showed that aggregate packing structure is greatly affected by aggregate shape properties, in terms of volumetric properties and mechanical properties. Statistical analysis results indicated that cubical shape is the recommended shape to optimise the quality of aggregate packing structure of PAM. The research provided in-depth analysis of PAM packing structure, in terms of volumetric and mechanical properties. The results of these experiments indicated that DEM simulation is an appropriate method to evaluate aggregate packing structure of PAM.
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