Water flow simulation and analysis in HMA microstructure

Abstract: This paper introduces a new method for reconstructing virtual two-dimensional (2-D) microstructure of hot mix asphalt (HMA). Based on the method, the gradation of coarse aggregates and the film thickness of the asphalt binder can be defined by the user. The HMA microstructure then serves as the input to the computational fluid dynamic (CFD) software (ANSYS-FLUENT) to investigate the water flow pattern through it. It is found that the realistic flow fields can be simulated in the 2-D micro-structure and the flow patterns in some typical air void structures can be identified. These flow patterns can be used to explain the mechanism that could result in moisture damage in HMA pavement. The one-dimensional numerical permeability values are also derived from the flow fields of the 2-D HMA microstructure and compared with the measured values obtained by the Karol-Warner permeameter. Because the interconnected air voids channels in actual HMA samples cannot be fully represented in a 2-D model, some poor agreements need to be improved.

[1]  Luc Taerwe,et al.  Random particle model for concrete based on Delaunay triangulation , 1993 .

[2]  Saeed Maghsoodloo,et al.  Developing Critical Field Permeability and Pavement Density Values for Coarse-Graded Superpave Pavements , 2001 .

[3]  R. Christopher Williams,et al.  Investigation of In-Place asphalt film thickness and performance of hot-mix asphalt mixtures , 2009 .

[4]  Baskar Ganapathysubramanian,et al.  Modeling diffusion in random heterogeneous media: Data-driven models, stochastic collocation and the variational multiscale method , 2007, J. Comput. Phys..

[5]  Ronald Christopher Williams,et al.  Alternative Test Methods for Measuring Permeability of Asphalt Mixes , 2010 .

[6]  Xiaoxiong Zhong,et al.  Study of Compaction in Hot-Mix Asphalt Using Computer Simulations , 2008 .

[7]  Eyad Masad,et al.  Three dimensional simulation of fluid flow in X‐ray CT images of porous media , 2004 .

[8]  Ali Pak,et al.  Pore scale study of permeability and tortuosity for flow through particulate media using Lattice Boltzmann method , 2011 .

[9]  Katalin Bagi,et al.  An algorithm to generate random dense arrangements for discrete element simulations of granular assemblies , 2005 .

[10]  Ahmet H. Aydilek,et al.  Estimating Directional Permeability of Hot-Mix Asphalt by Numerical Simulation of Microscale Water Flow , 2007 .

[11]  R. Christopher Williams,et al.  Quality control/quality assurance testing for longitudinal joint density and segregation of asphalt mixtures , 2013 .

[12]  Qingli Dai,et al.  Two- and three-dimensional micromechanical viscoelastic finite element modeling of stone-based materials with X-ray computed tomography images , 2011 .

[13]  Allen Cooley,et al.  RELATIONSHIPS OF HMA IN-PLACE AIR VOIDS, LIFT THICKNESS, AND PERMEABILITY. VOLUMES ONE THROUGH FOUR , 2004 .

[14]  S. Torquato,et al.  Nearest-surface distribution functions for polydispersed particle systems. , 1992, Physical review. A, Atomic, molecular, and optical physics.

[15]  Chun Fai Leung,et al.  Numerical solutions for flow in porous media , 2003 .

[16]  Hamid Sadouki,et al.  Simulation and analysis of composite structures , 1985 .

[17]  Christopher Holt Harris.  Hot Mix Asphalt Permeability: Tester Size Effects and Anisotropy , 2007 .

[18]  Dallas N. Little,et al.  Three-dimensional microstructural modeling of asphalt concrete using a unified viscoelastic–viscoplastic–viscodamage model , 2012 .