By Eyad Masad, Vassilis Panoskaltsis, Linbing Wang
This ''Geotechnical exact Publication'' includes papers provided throughout 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 very important issues in pavement engineering, resembling: 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. in addition they spotlight the numerical implementation of micromechanical types that concentrate on developing the linkage among the houses of asphalt concrete parts and the macroscopic reaction. This lawsuits is a synthesis of the new advances in pavement mechanics, and may be precious to engineers operating with pavement research, layout, and function prediction
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Extra info for Asphalt Concrete : Simulation, Modeling, and Experimental Characterization
Example text
It is very important to obtain good images in the scanning process so that accuracy can be established from the very beginning. When multiple slices are stacked together they created a 3D visualization of the internal structure of the specimen. Several computer codes, using IDL (Interactive Data Language), were written to carry out the 3D reconstruction and quantification (illustrated in Figure 2). Through image processing, the series of images were transformed into a 3D data array that can be mapped into FEM elements.
And Shukla, A. (2005). "Prediction of Damage Behaviors in Asphalt Materials using a Finite Element Micromechanical Model and Image Analysis", Journal of Engineering Mechanics, ASCE, to be appear. H. (2004). "Parametric Model Study of Microstructure Effects On Damage Behavior of Asphalt Samples", International Journal of Pavement Engineering, Vol. 5(1), pp. 19-30. , Z. R. Kim. (2002). "Towards a Micromechanics-Based Procedure to Characterize Fatigue Performance of Asphalt Concrete," Proc. 81st Transportation Research Board Annual Meeting, Washington.
And Newcomb, D. E. (1997). " Journal of Engineering Mechanics, 123(6), 596-603. 0364 Theoretical solution 1 2 phases: binder*voids, aggregates 3 phases: aggregates, binder, voids 2 Stress concentration factor. F. F. F. F. F. F. 57% ASPHALT CONCRETE Figure 1 Gray image from x-ray scan Figure 2 Reconstruction of three-dimensional microstructure 37 38 ASPHALT CONCRETE Figurre 3 Three dimensionnal FE model 39 ASPHALT CONCRETE Stress notation used in following graphs: 1 - Stress along vertical diameter 2 - Stress along Horizontal diametei S11-1-1 11- Stress in horizontal direction 22 - Stress in vertical direction 1 — w/ voids 2 - w/o voids Figure 4 Stresses distribution for the fine-mix sample 40 ASPHALT CONCRETE Figure 5 Stresses distribution for the fine-plus mix sample ASPHALT CONCRETE Figure 6 Stresses distribution for coarse-mix sample 41 42 ASPHALT CONCRETE Figure 7 Stresses distribution along sample diameters (theoretical solution) ASPHALT CONCRETE Figure 8 Stress concentration comparison Note: sll along vertical dioameter with voids removed Figure 9 Stress distribution for different E ratios 43 The Development of a Microstructural-Based Continuum Model for Hot Mix Asphalt Samer H.