By Eyad Masad, Vassilis Panoskaltsis, Linbing Wang
This ''Geotechnical targeted Publication'' comprises papers provided through the symposium on Mechanics of versatile Pavements, a part of the 2005 Joint ASME/ASCE/SES convention on Mechanics and fabrics, held in Baton Rouge, Louisiana on June 1-3, 2005. The papers during this ebook specialise in very important issues in pavement engineering, corresponding to: modeling asphalt concrete reaction on the microstructural point, improvement and numerical implementation of constitutive versions, and experimental characterization of asphalt concrete below various loading and environmental stipulations. additionally they spotlight the numerical implementation of micromechanical types that target constructing the linkage among the homes of asphalt concrete elements and the macroscopic reaction. This lawsuits is a synthesis of the new advances in pavement mechanics, and may be helpful to engineers operating with pavement research, layout, and function prediction
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Extra resources for Asphalt Concrete : Simulation, Modeling, and Experimental Characterization
Example text
Element groups representing aggregates and asphalt binders were assigned different elastic material properties while the element group for voids was removed during the loading steps. In this study, all the non-voids components were assigned elastic properties that may represent the behavior of the binder at low temperature and small loading magnitude. The result of the FEM simulation was compared with the analytical elastic solution to verify the accuracy of FEM simulation so that proper mesh size could be determined.
In the calculation of the average stress (needed for calculating the stress concentration factor), the stresses along the 20mm and the 80 mm position (with a height of 60mm) ASPHALT CONCRETE 33 were averaged to avoid the local effect in the vicinity of the loading plate. The results are tabulated in Table 1. The result may imply that the fine mix will have the best performance, which was observed in the field experiment. The simulations are for thin disks. Generally, the stress distribution for all fine mix specimens (thin disks) is consistent.
20 ASPHALT CONCRETE CONCLUSIONS A micromechanical constitutive model was formulated and used to simulate the viscoelasto-plastic behavior of asphalt mixture. The aggregate-mastic microstructure was simulated by incorporating the user material subroutine with continuum elements for asphalt mastic and rigid body elements for each aggregate. Maxwell-type viscoelastic and Chaboche's plastic modes were combined to investigate the asphalt viscoelasto-plastic behavior. Finite element analysis incorporated the displacementbased incremental algorithm for viscoelastic part and predictor-correct scheme for elastoplastic element.
