We established a user-defined micromechanical model using discrete element method (DEM) to investigate the cracking behavior of asphalt concrete (AC).Using the “Fish” language provided in the particle flow code in 3-Demensions (PFC3D),the air voids and mastics in asphalt concrete were realistically built as two distinct phases.With the irregular shape of individual aggregate particles modeled using a clump of spheres of different sizes,the three-dimensional (3D) discrete element model was able to account for aggregate gradation and fraction.Laboratory uniaxial complex modulus test and indirect tensile strength test were performed to obtain input material parameters for the numerical simulation.A set of the indirect tensile test were simulated to study the cracking behavior of AC at two levels of temperature,i e,-10 ℃ and 15 ℃.The predicted results of the numerical simulation were compared with laboratory experimental measurements.Results show that the 3D DEM model is able to predict accurately the fracture pattern of different asphalt mixtures.Based on the DEM model,the effects of air void content and aggregate volumetric fraction on the cracking behavior of asphalt concrete were evaluated.
参考文献
| [1] | Kim, H;Buttlar, WG .Discrete fracture modeling of asphalt concrete[J].International Journal of Solids and Structures,2009(13):2593-2604. |
| [2] | Multi-scale fracture modeling of asphalt composite structures[J].Composites science and technology,2009(15/16):2716. |
| [3] | Martin H. Sadd;Qingli Dai .A comparison of micro-mechanical modeling of asphalt materials using finite elements and doublet mechanics[J].Mechanics of materials,2005(6):641-662. |
| [4] | Dai QL;You ZP .Prediction of creep stiffness of asphalt mixture with micromechanical finite-element and discrete-element models[J].Journal of Engineering Mechanics,2007(2):163-173. |
| [5] | Chang KNG;Meegoda JN .Micromechanical simulation of hot mix asphalt[J].Journal of Engineering Mechanics,1997(5):495-503. |
| [6] | Ala Abbas;Eyad Masad;Tom Papagiannakis;Tom Harman .Micromechanical Modeling of the Viscoelastic Behavior of Asphalt Mixtures Using the Discrete-Element Method[J].International journal of geomechanics,2007(2):131-139. |
| [7] | Tongyan Pan;Erol Tutumluer;Samuel H. Carpenter .Effect of Coarse Aggregate Morphology on Permanent Deformation Behavior of Hot Mix Asphalt[J].Journal of Transportation Engineering,2006(7):580-589. |
| [8] | M. Lu;G. R. McDowell .The importance of modelling ballast particle shape in the discrete element method[J].Granular matter,2007(1/2):69-80. |
| [9] | E. Masad;V. K. Jandhyala;N. Dasgupta .Characterization of Air Void Distribution in Asphalt Mixes using X-ray Computed Tomography[J].Journal of Materials in Civil Engineering,2002(2/3):122-129. |
| [10] | Yu Liu;Qingli Dai;Zhanping You;Ph.D;P.E;M.ASCE .Viscoelastic Model for Discrete Element Simulation of Asphalt Mixtures[J].Journal of Engineering Mechanics,2009(4):324-333. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%