Modelling and evaluation of aggregate morphology on asphalt compression behavior

Abstract Asphalt mixtures are widely used in the construction of high-grade highways and airport pavements. With regard to numerical simulations it was considered as homogeneous due to limitations of low computational capacity. In fact, it is a typical heterogeneous composite material consisting of aggregate with irregular shape and random distribution, asphalt binder and air voids. The heterogeneous numerical model is more consistent with reality and thus yields more reliable results. Experimental investigations have implied that morphological properties of aggregate have a great impact on the performance of asphalt mixtures. Unfortunately, it is extremely difficult to suppress the interferences from other features of the asphalt mixture in experiments, such as aggregate orientations, the spatial distribution of aggregates and air voids. In this study, the microstructural model of asphalt mixture used for uniaxial compression test was reconstructed based on X-ray CT scans, thus maintaining the original morphology of the aggregate. Then the angularity of the aggregate was decreased artificially while the other features of the asphalt mixture remained constant. Based on these microstructures three dimensional finite element models with different aggregate angularities were created followed by a simulation of a uniaxial compression test. The relationship between aggregate angularity and mechanical responses of the asphalt mixture, such as load-carrying capacity, creep deformation of the asphalt mastic, damage behavior and energy dissipation were investigated. The computational results indicate that the aggregate angularity significantly affects the mechanical responses of the asphalt mixture; some initial relationships were set up with high degrees of determination. The quantitative correlation is suggested to be analyzed based on extensive experimental and numerical studies in future research.

[1]  Hussain U Bahia,et al.  Internal structure characterization of asphalt mixtures for rutting performance using imaging analysis , 2012 .

[2]  L. Mo,et al.  Damage development in the adhesive zone and mortar of porous asphalt concrete , 2010 .

[3]  M. Oeser,et al.  Influence of aggregate particles on mastic and air-voids in asphalt concrete , 2015 .

[4]  John M. Boone,et al.  Development of a micromechanical finite element model from computed tomography images for shear modulus simulation of asphalt mixtures , 2012 .

[5]  Markus Oeser,et al.  Evaluation of aggregate resistance to wear with Micro-Deval test in combination with aggregate imaging techniques , 2015 .

[6]  Yong-Rak Kim,et al.  Experimental Testing and Finite Element Modeling to Evaluate Effects of Aggregate Angularity on Bituminous Mixture Performance , 2010 .

[7]  Zhanping You,et al.  Aggregate representation for mesostructure of stone based materials using a sphere growth model based on realistic aggregate shapes , 2016 .

[8]  Glaucio H. Paulino,et al.  δ25 Crack opening displacement parameter in cohesive zone models: experiments and simulations in asphalt concrete , 2008 .

[9]  Liang Li,et al.  Virtual testing of asphalt mixture with two-dimensional and three-dimensional random aggregate structures , 2017 .

[10]  Yong-Rak Kim,et al.  Effects of Aggregate Angularity on Mix Design Characteristics and Pavement Performance , 2009 .

[11]  Hussain U Bahia,et al.  MODELING AND EXPERIMENTAL MEASUREMENTS OF STRAIN DISTRIBUTION IN ASPHALT MIXES , 2001 .

[12]  Markus Oeser,et al.  Tire–Road Contact Stiffness , 2014, Tribology Letters.

[13]  Xu Yang,et al.  Review on heterogeneous model reconstruction of stone-based composites in numerical simulation , 2016 .

[14]  Jongeun Baek,et al.  Modeling reflective cracking development in hot-mix asphalt overlays and quantification of control techniques , 2010 .

[15]  Markus Oeser,et al.  Investigation on fatigue damage of asphalt mixture with different air-voids using microstructural analysis , 2016 .

[16]  Jorge Barbosa Soares,et al.  Multiscale Modeling to Predict Mechanical Behavior of Asphalt Mixtures , 2010 .

[17]  Dawei Wang,et al.  Application of semi-analytical finite element method to evaluate asphalt pavement bearing capacity , 2018 .

[18]  Yu Liu,et al.  Three-dimensional discrete element modeling of asphalt concrete: Size effects of elements , 2012 .

[19]  G. H. Paulino,et al.  Disk-shaped compact tension test for asphalt concrete fracture , 2005 .

[20]  A. Philipse,et al.  Simulation of random packing of binary sphere mixtures by mechanical contraction , 2005 .

[21]  Xinhua Yang,et al.  Three-dimensional heterogeneous fracture simulation of asphalt mixture under uniaxial tension with cohesive crack model , 2015 .

[22]  M. K. Chang,et al.  INFLUENCE OF COARSE AGGREGATE SHAPE ON THE STRENGTH OF ASPHALT CONCRETE MIXTURES , 2005 .

[23]  Dawei Wang,et al.  Fractal and spectral analysis of aggregate surface profile in polishing process , 2011 .

[24]  W. Buttlar,et al.  Discrete fracture modeling of asphalt concrete , 2009 .

[25]  Jing Hu,et al.  Investigation on Fracture Performance of Lightweight Epoxy Asphalt Concrete Based on Microstructure Characteristics , 2016 .

[26]  Shihui Shen,et al.  Impact of aggregate packing on dynamic modulus of hot mix asphalt mixtures using three-dimensional discrete element method , 2012 .

[27]  Glenn R. McDowell,et al.  Modelling realistic shape and particle inertia in DEM , 2010 .

[28]  Xinhua Yang,et al.  Experimental and numerical investigation of fracture behavior of asphalt mixture under direct shear loading , 2015 .

[29]  William G. Buttlar,et al.  Discrete Element Modeling of Asphalt Concrete: Microfabric Approach , 2001 .

[30]  Zhanping You,et al.  The Effect of Morphological Characteristic of Coarse Aggregates Measured with Fractal Dimension on Asphalt Mixture’s High-Temperature Performance , 2016 .

[31]  Jorge Barbosa Soares,et al.  Aggregate Shape Properties and Their Influence on the Behavior of Hot-Mix Asphalt , 2015 .

[32]  A. A. Mirghasemi,et al.  Particle shape consideration in numerical simulation of assemblies of irregularly shaped particles , 2011 .

[33]  Glenn R. McDowell,et al.  A method to model realistic particle shape and inertia in DEM , 2010 .

[34]  Sanjeev Adhikari,et al.  Dynamic modulus simulation of the asphalt concrete using the X-ray computed tomography images , 2009 .