By Eyad Masad, Vassilis Panoskaltsis, Linbing Wang
This ''Geotechnical detailed 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 e-book concentrate on vital subject matters in pavement engineering, comparable to: modeling asphalt concrete reaction on the microstructural point, improvement and numerical implementation of constitutive types, and experimental characterization of asphalt concrete lower than assorted loading and environmental stipulations. additionally they spotlight the numerical implementation of micromechanical versions that target setting up the linkage among the homes of asphalt concrete components and the macroscopic reaction. This court cases is a synthesis of the hot advances in pavement mechanics, and may be precious to engineers operating with pavement research, layout, and function prediction
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Extra resources for Asphalt Concrete : Simulation, Modeling, and Experimental Characterization
The stress concentration varies significantly with the void distribution and the relative stiffness between aggregate and binder. IDT test should be combined with FEM simulation to offer better interpretation of the test results. The stress concentration factor may serve as a good simple performance indicator. ACKNOWLEDGEMENT This study is based upon work supported by the National Science Foundation under Partnership for Innovation Grant No. 0438480. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation REFERENCES Collop, A.
Can be shown to be (Dessouky 2005): (8) where for an isotropic material (A = 0) and d = 1, p* is equal to P. Figure 2. shows the relationship between p* and p. It can be seen that dilation increases with an increase in anisotropy represented by the A value. This is an important finding, as it agrees with the experimental measurements made by other researchers on granular materials. For example, Oda (1972) found that maximum dilation occurred when the preferred orientation of particles coincided with the ASPHALT CONCRETE 48 horizontal direction and the major principal stress was imposed in the vertical direction.
Both behaviors show that higher loading rates generate larger specimen stiffness with less relaxation time. 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.