00730326

Component

https://doi.org/10.3141/1526-17

http://scholar.google.com...eahy&publication_year=1996

Although existing nondestructive evaluation methods and transducers provide useful quantitative information on composite materials, they measure only macroscopic deformations and, often, only after the strain has exceeded a certain predetermined threshold. It is well established, however, that maintenance intervention is more effective if applied early in the deformation process. A new method for computing the microscopic internal displacement fields associated with permanent deformations of three-dimensional asphalt-aggregate cores with complex internal structure and satisfying the small gradient approximation of continuum mechanics is presented. The displacement fields are computed from a sequence of three-dimensional X-ray computed tomography images, obtained using a new imaging protocol developed specifically for mass-fraction and mix-density estimates of composite cores. By assuming that the image intensity of the tomographic images represents a certain conserved property that is incompressible, a constrained nonlinear regression model for motion estimation is developed. Successive linear approximation is then employed and each linear subsidiary problem is solved using variational calculus. The resulting Euler-Lagrange equations are approximated and solved using finite differencing methods and a conjugate gradient algorithm in a multiresolution framework. The method is validated using pairs of synthetic images of plane shear flow. The three-dimensional displacement field in the interior of a cylindrical asphalt/aggregate core loaded to a state of permanent deformation is calculated using this method.

This paper appears in Transportation Research Record No. 1526, Emerging Technologies in Geotechnical Engineering.

English

p. 135-141

1996

Transportation Research Record

0309062209

Figures (5) ; References (17)

Asphalt; Core samples; Deformation; Mathematical models

X-ray computed tomography

Highways; Materials; I31: Bituminous Binders and Materials

TRIS, TRB

Dec 27 1997 12:00AM

• ANALYSIS OF ANCHOR MOORING LINES IN COHESIVE SEAFLOOR
• BACKCALCULATION OF PAVEMENT PROFILES FROM SPECTRAL-ANALYSIS-OF-SURFACE-WAVES TEST BY NEURAL NETWORKS USING INDIVIDUAL RECEIVER SPACING APPROACH
• DEVELOPMENT OF COMPUTER VISION TECHNIQUE FOR IN SITU SOIL CHARACTERIZATION
• DEVELOPMENT OF DIGITAL IMAGE-PROCESSING ALGORITHM TO COMPUTE UNIFIED CRACK INDEX FOR SALT LAKE CITY
• DIGITAL IMAGING TECHNIQUES FOR ASSESSMENT OF HOMOGENEITY OF GRANULAR MATERIALS
• DIGITAL-IMAGE-BASED COMPUTER MODELING AND VISUALIZATION OF CEMENT-BASED MATERIALS
• EARTH PRESSURES DUE TO COMPACTION: COMPARISON OF THEORY WITH LABORATORY AND FIELD BEHAVIOR
• ESTIMATION OF DYNAMIC PROPERTIES OF SAND USING ARTIFICIAL NEURAL NETWORKS
• EVALUATING CLAY MICROFABRIC USING SCANNING ELECTRON MICROSCOPY AND DIGITAL INFORMATION PROCESSING
• IDENTIFYING FAILURE THROUGH LOCATIONS OF ACOUSTIC EMISSION
• LIQUEFACTION RISK ASSESSMENT: EVALUATION OF THREE STATISTICAL MODELS
• METHODOLOGY FOR CREATING DEFENSIBLE THREE-DIMENSIONAL VISUALIZATIONS
• NEURAL MODELING OF KANSAS SOIL SWELLING
• NEW APPROACH TO INTERPRETATION OF NONINVASIVE SURFACE WAVE MEASUREMENTS FOR SOIL PROFILING
• NUMERICAL MODELING OF EARTH STRUCTURES: SOME THINGS TO CONSIDER
• PERFORMANCE OF MIXED BRACING SYSTEM IN DEEP EXCAVATION OF STIFF SOIL
• RELATING FAILURE TESTS PERFORMED IN HOLLOW CYLINDER APPARATUS TO INHERENT ANISOTROPY
• RELIABILITY-BASED DESIGN OF REINFORCED EARTH RETAINING WALLS
• SITEVIEW: PRACTICAL GEOENVIRONMENTAL VISUALIZATION
• THREE-DIMENSIONAL CHARACTERIZATION OF CONTAMINANT PLUMES
• THREE-DIMENSIONAL CHARACTERIZATION WITH LIMITED DATA: AN EXAMPLE FROM PLAYA-LAKE BASIN, SOUTHEAST ARIZONA
• THREE-DIMENSIONAL IMAGE ANALYSIS OF AGGREGATE PARTICLES FROM ORTHOGONAL PROJECTIONS
• THREE-DIMENSIONAL STRATIGRAPHIC CHARACTERIZATION FOR GEOTECHNICAL EXPLORATION
• USING CONE PENETRATION TEST TO DETERMINE DRAINED FRICTION ANGLE OF SANDS