Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Search Publications by: Edward Garboczi (Assoc)

Displaying 401 - 425 of 456

The Use of Digital Images to Determine Deformation Throughout a Microstructure - Part 1 - Deformation Mapping Technique

November 1, 2000

Author(s)

C M. Neubauer, Edward Garboczi, Hamlin M. Jennings

Materials with heterogeneous microstructures do not deform uniformly under stress (mechanical or environmental). A new deformation mapping technique (DMT), which compares digital images of microstructures of the same field of view before and after

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

Using Impedance Spectroscopy to Assess the Viability of the Rapid Chloride Test for Determining Concrete Conductivity

July 1, 2000

Author(s)

Kenneth A. Snyder, Chiara C. Ferraris, Nicos Martys, Edward Garboczi

The suitability of using the initial current from the rapid chloride test (ASTM C 1202) to determine specimen conductivity is tested using impedance spectroscopy with a frequency spectrum of 10 Hz to 1 MHz. The specimen conductivity has an analytical

New Effective Medium Theory for the Diffusivity or Conductivity of a Multi-Scale Concrete Microstructure Model

June 1, 2000

Author(s)

Edward J. Garboczi, J G. Berryman

To attempt to represent concrete properly as a composite material, one must consdier at least three phases: matrix, aggregates, and the interfacial transition zone (ITZ), a thin shell of altered matrix material surrounding each aggregate grain. Assigning

Effect of the Interfacial Transition Zone on the Conductivity of Portland Cement Mortars

May 1, 2000

Author(s)

J D. Shane, T Mason, D A. Jennings, Edward Garboczi, Dale P. Bentz

The electrical conductivity of portland cement mortars was determined experimentally as a function of the volume fraction of sand and degree of hydration. The results were analyzed using theoretical models that represent the mortars as three-phase

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

Impedance Spectra of Fiber-Reinforced Cement-Based Composites: A Modeling Approach

April 1, 2000

Author(s)

J M. Torrents, T Mason, Edward Garboczi

The impedance response of conductive fiber-reinforced cement-based materials was investigated using model systems (physical simulations) consisting of conducting needles in aqueous solutions. Two discrete bulk arcs are observed in the Nyquist plots for

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

Effects of Cement Particle Size Disbribution on Performance Properties of Portland Cement-Based Materials

October 1, 1999

Author(s)

Dale P. Bentz, Edward J. Garboczi, C Haecker, O M. Jensen

The original size, spatial distribution, and composition of Portland cement particles have a large influence on hydration kinetics, microstructure development, and ultimate properties of cement-based materials. In this paper, the effects of cement particle

Elastic Properties of a Tungsten-Silver Composite by Reconstruction and Computation

September 1, 1999

Author(s)

A P. Roberts, Edward Garboczi

A three-dimensional model of a tungsten-silver composite is statistically constructed from an experimental two-dimensional image. The effective Young's modulus (E) of the model is computed in the temperature range 25-1060 C using a finite element method

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.