Abstract
This paper addresses simulation of asphalt on the macroscopic scale, using the Discrete Element Model (DEM). Asphalt mixture is considered as a particulate solid composed of relatively stiff deformable layered spherical particles embedded into a homogenised matrix. The discrete model presents a 3D network of one-dimensional elements connecting particle's centres and comprising mutual interaction of particles. The contribution of the film layer and the interface thickness for normal stiffness is described analytically and illustrated by simulation results. Development of the normal interaction model of layered particles contacting via interface on the meso scale is the key point of the current development. The model applied aiming to simulate deformation of asphalt mixture is able to capture properties of the weaker matrix interface while layered particle comprises of bitumen film in meso scale. The developed technique is applied for simulation of Marshall test, i.e. diametric compression of cylindrical specimen, widely used for characterisation of asphalt mixtures. Finally, suitability of the model is illustrated by comparison with the available experimental results.
Highlights
Asphalt mix is a heterogeneous material composed of asphalt binder, aggregates and air voids
An asphalt mix designed under laboratory conditions and later reproduced in an asphalt mixing plant (AMP) must maintain the same parameters and deviations of the job mix formula (JMF) must not exceed maximum/minimum values (Bražiūnas et al 2013; Bražiūnas, Sivilevičius 2010)
This paper focuses on asphalt concrete type AC 16 PD 70/100, which is widely used for road structures
Summary
Asphalt mix is a heterogeneous material composed of asphalt binder, aggregates and air voids. The Discrete Element Method (DEM) is another numerical technique that was recently suggested by Cundall and Strack (1979) This approach is elaborated for modelling of discontinuous materials, were individual particles are modelled as deformable interacting bodies. When DEM approach is used for analysis of granular materials, this method evaluates a unilateral contact; bilateral contact dominates in the interaction of particles found in the real asphalt mix type materials. Basic definitions and the approach In reality, asphalt-type mixtures are heterogeneous particulate solids composed from particles of various sizes and shapes, surrounded by the binder matrix. We follow the concept that fine aggregate, mineral filler and asphalt binder are mixed as an integrated component to interact with coarse aggregate particles. Rimša et al Numerical analysis of asphalt mixture and comparison with physical Marshall test
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