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Search Publications by: Edward Garboczi (Fed)

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Displaying 176 - 200 of 208

Acquiring, Analyzing, and Using Complete Three-Dimensional Aggregate Shape Information

April 1, 2001
Author(s)
Edward J. Garboczi, Nicos Martys, H A. Saleh, Richard A. Livingston
The shape of aggregates, from whatever source, plays a crucial role in determining the properties of the composite material in which they are embedded (e.g., asphaltic or portland cement concrete). To properly characterize this three-dimensional shape

Elastic Moduli of Model Random Three-Dimensional Closed-Cell Cellular Solids

January 1, 2001
Author(s)
A P. Roberts, Edward Garboczi
Most cellular solids are random materials, while practically all theoretical results are for periodic models. To be able to generate theoretical results for random models, the finite element method (FEM) was used to study the elastic properties of solids

Elastic Properties of Model Porous Ceramics

December 1, 2000
Author(s)
A P. Roberts, Edward Garboczi
The finite element method (FEM) is used to study the influence of porosity and pore shape on the elastic properties of model porous ceramics. Young's modulus of each model is practically independent of the solid Poisson's ratio. At a sufficiently high

Knowledge-Based Systems and Computational Tools for Concrete - Computer Integrated Knowledge Systems Combine Databases, Models, and Computing Tools to Address the Complex Nature of Concrete

December 1, 2000
Author(s)
Edward J. Garboczi, Dale P. Bentz, G J. Frohnsdorff
Within the Building Materials Division at the National Institute of Standards and Technology (NIST), the Hypercon Partnership for High Performance Concrete Technology [(PHPCT) http://ciks.cbt.nist.gov/phpct/] program is working to develop the materials

User's Guide to the NIST Virtual Cement and Concrete Testing Laboratory. Version 1.0

November 1, 2000
Author(s)
Jeffrey W. Bullard, Chiara F. Ferraris, Edward J. Garboczi, Nicos Martys, Paul E. Stutzman
This NISTIR serves as the user's manual for Version 1.0 of the Virtual Cement and Concrete Testing Laboratory (VCCTL). Using the VCCTL, a user may create starting microstructures of cement (gypsum, fly ash, etc.) particles in water, hydrate the

Percolation Aspects of Cement Paste and Concrete - Properties and Durability

August 1, 2000
Author(s)
Edward J. Garboczi, Dale P. Bentz
Synopsis: Portland cement concrete is a composite material, where the matrix consists of portland cement paste. Cement paste forms from the hydration reaction of portland cement with water. The microstructure of cement paste changes drastically over a time

Modeling the Microstructure and Elastic Properties of Complex Materials

May 1, 2000
Author(s)
A P. Roberts, Edward Garboczi
This document is derived from three reviewed papers by the same authors: (1)Elastic properties of a tungsten-silver composite by reconstruction and computation; (2)Elastic properties of model porous ceramics; and (3)Elastic properties of model random three

The Past, Present, and Future of the Computational Materials Science of Concrete

April 1, 2000
Author(s)
Edward J. Garboczi, Dale P. Bentz, G J. Frohnsdorff
The computational materials science of concrete has developed rapidly in the last 15 years. This development has been strongly tied to the even more rapid advances in computer processor speed and memory during this same time, without which progress in the

Transport Properties and Durability of Concrete: Literature Review and Research Plan

September 1, 1999
Author(s)
Dale P. Bentz, J R. Clifton, Chiara F. Ferraris, Edward J. Garboczi, J M. Torrents
The increased emphasis on life cycle cost analysis for building projects requires that new attention be focused on the service life and durability of concrete structures. While concrete is typically specified based on compressive strength and slump, it is

Digital Images and Computer Modelling

July 1, 1999
Author(s)
Edward J. Garboczi, Dale P. Bentz, Nicos Martys
This chapter describes how digital images of porous materials can be analyzed to give information about the structure and properties of the material, describes various ways 3-D digital-image-based models can be generated to help understand real materials.

Computer Simulation and Percolation Theory Applied to Concrete.

January 1, 1999
Author(s)
Edward J. Garboczi, Dale P. Bentz
Concrete is a multilength scale composite material. From the nanometer to the millimeter scale, it is a random composite, and a different random composite at each length scale. Percolation processes play a key role in the microstucture of concrete, and

Diffusivity-Porosity Relation for Cement Paste

January 1, 1999
Author(s)
Edward J. Garboczi, Dale P. Bentz
The development of a ionic diffusivity-porosity relation for cement paste, soundly based on microstructure, along with future developments in this area, are discussed. The importance of such relations for sulfate attack and other mechanisms of