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Search Publications by: Edward Garboczi (Assoc)

Displaying 351 - 375 of 456

Impedance/Dielectric Spectroscopy of Electroceramics in the Nanograin Regime

December 3, 2002

Author(s)

N Kidner, Z J. Homrighaus, B J. Ingram, T Mason, Edward Garboczi

In the microcrystalline regime, the behavior of grain boundary-controlled electroceramics is well described by the brick layer model (BLM). In the nanocrystalline regime, however, grain boundary layers can represent a significant volume fraction of the

Computation of Linear Elastic Properties From Microtomographic Images: Methodology and Agreement Between Theory and Experiment

October 1, 2002

Author(s)

C H. Arns, M A. Knackstedt, W V. Pinczewski, Edward Garboczi

Elastic property-porosity relationships are derived directly from microtomographic images. This is illustrated for a suite of 4 samples of Fontainebleau sandstone with porosities ranging from 7.5 % to 22 %. A finite element method is used to derive the

Frequency-Dependent Electrical Mixing Law Behavior in Spherical Particle Composites

October 1, 2002

Author(s)

M A. Campo, L Y. Woo, T Mason, Edward Garboczi

The electrical properties of cement-based composites with mono-size conductive (steel) or insulating (glass) spherical inclusions were investigated by combined 2-point impedance spectroscopy and 4-point DC resistance measurements. The matrix was ordinary

Smart and Designer Structural Material Systems

October 1, 2002

Author(s)

K P. Chong, Edward Garboczi

An efficient civil infrastructure system is essential to every country's productivity and quality of life. Basic research and development in smart structures and designer materials has shown great potential for enhancing the functionality, serviceability

Three-Dimensional Mathematical Analysis of Particle Shape Using X-Ray Tomography And Spherical Harmonics: Application To Aggregates Used In Concrete

October 1, 2002

Author(s)

Edward J. Garboczi

The properties of composites made by placing inclusions in a matrix are often controlled by the shape and size of the particles used. Mathematically characterizing the shape of particles in three dimensions is not a particularly easy task, especially when

Computation of Linear Elastic Properties from Microtomographic Images: Methodology and Match to Theory and Experiment.

September 30, 2002

Author(s)

Edward J. Garboczi, C H. Arns, M A. Knackstedt, W V. Pinczewski

Elastic property-porosity relationships are derived directly from microtomographic images. This is illustrated for a suite of 4 samples of Fontainebleau sandstone with porosities ranging from 7.5% to 22%. A finite element method is used to derive the

Computation of the Linear Elastic Properties of Random Porous Materials With a Wide Variety of Microstructure

May 1, 2002

Author(s)

A P. Roberts, Edward Garboczi

A finite-element method is used to study the elastic properties of random three-dimensional porous materials with highly interconnected pores. We show that the Young's modulus, E, is practically independent of the Poisson's ratio of the solid phase, υs

E-Concrete? Believe It!

February 1, 2002

Author(s)

G J. Frohnsdorff, Edward J. Garboczi

In recent years, the complexity of concrete mixture proportioning has increased dramatically. New chemical admixtures, such as high-performance superplasticizers and shrinkage-reducing admixtures, have been introduced into the marketplace. Due to both

Computation of the Linear Elastic Properties of Random Porous Materials With a Wide Variety of Microstructure.

January 1, 2002

Author(s)

Edward J. Garboczi, A P. Roberts

Elastic Properties of Model Random Three-Dimensional Open-Cell Solids

January 1, 2002

Author(s)

A P. Roberts, Edward Garboczi

Most cellular solids are random materials, while practically all theoretical structure-property relations are for periodic models. To generate theoretical results for random models the finite element method (FEM) was used to study the elastic properties of

Intrinsic Conductivity of Short Conductive Fibers in Composites by Impedance Spectroscopy

December 1, 2001

Author(s)

A D. Hixson, L Y. Woo, M A. Campo, T Mason, Edward Garboczi

Electrical property measurements (DC conductivity, impedance spectroscopy) were employed to determine the intrinsic conductivities of short conductive fibers in cement matrix composites. Intrinsic conductivity determines the variation of overall

Intrinsic Viscosity and the Electric Polarizability of Arbitrarily Shaped Objects

December 1, 2001

Author(s)

M Mansfield, Jack F. Douglas, Edward Garboczi

The problem of calculating the electrical polarizability tensor αe of objects of arbitrary shape has been reformulated in terms of path integration and implemented computationally. The method simultaneously yields the electrostatic capacity C and the

Multi-Scale Microstructural Modeling to Predict Chloride Ion Diffusivity for High Performance Concrete

November 1, 2001

Author(s)

Dale P. Bentz, Edward J. Garboczi

As durability issues become increasingly prominent in concrete design, the need to predict the transport properties of a given concrete mixture becomes critical. For many degradation scenarios (corrosion, sulfate attack, etc.), the diffusion coefficient of