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Search Publications by: Edward Garboczi (Assoc)

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Displaying 101 - 125 of 259

Certification of SRM 2493:Standard Reference Mortar for Rheological Measurements

October 4, 2017
Author(s)
Alex Olivas, Chiara C. Ferraris, Nicos Martys, Edward Garboczi, Blaza Toman, William L. George
Rheological measurements are often performed using a rotational rheometer. In this type of rheometer, the tested fluid is sheared between two surfaces, one of which acts as the rotating surface [1]. Usually, the rotational velocity is imposed and the

Electromagnetic Scattering from Individual Crumpled Graphene Flakes: A Characteristic Modes Approach

September 14, 2017
Author(s)
Edward J. Garboczi, Jack F. Douglas, Luis Fernando Vargas Lara, Ahmed M. Hassan, Deb Chatterjee, Kalyan Durbhakula, Md Gaffar
Graphene flakes in real composites are rarely perfectly flat, and often exhibit complicated crumpled shapes. Therefore, the goal of this work was to quantify the electromagnetic scattering characteristics of individual crumpled graphene flakes with shapes

Effects of Powder Oxidation on Impact Toughness of Electron Beam Melt Ti-6Al-4V

August 25, 2017
Author(s)
Edward J. Garboczi, Enrico Lucon, William Grell, Z Loftus, Maciej Kumosa, E Solis-Ramos, Paul Predecki, E Clark
Powder quality in additive manufacturing (AM) electron beam melt (EBM) of Ti-6Al-4V components is crucial in determining the critical material properties of the end item. In this study, we report on the effect of powder oxidation on Charpy impact energy of

Measurement and Modeling Needs for Next-Generation Concrete Binders

July 1, 2017
Author(s)
Jeffrey W. Bullard, Edward J. Garboczi, Paul E. Stutzman, Pan Feng, Alexander S. Brand, John G. Hagedorn, Wesley N. Griffin, Judith E. Terrill
Cementitious binders have become increasingly complex in their variety, mineralogical and chemical compositions, and structure over the past several decades, and there is no sign that the trend will stop or reverse in the future. Strategies for handling

Using Terahertz Waves to Identify the Presence of Goethite via Antiferromagnetic Resonance

April 24, 2017
Author(s)
Edward J. Garboczi, David F. Plusquellic, Robert D. McMichael, Virgil Provenzano, Paul E. Stutzman, Jack T. Surek, Shin G. Chou, Shuangzhen Wang
Virtually every corrosion detection method reports only the presence of a material phase denoting probable corrosion, not its spectral signature. A signature specific to the type of iron oxide corrosion would not only confirm the presence of corrosion but

Comparison of 2-D and 3-D shape analysis of concrete aggregate fines from VSI crushing

March 1, 2017
Author(s)
Edward J. Garboczi, Kenneth A. Snyder, Rolands Cepuritis, Stefan Jacobsen
The shape of concrete aggregate fines, with particle sizes between 3 µm and 250 µm, produced by high-speed vertical shaft impact (VSI) crushing of 10 different rock types from quarries in Norway, has been studied by both dynamic image analysis (DIA), which

Final Report for:EPA: LAG No. DW-13-93903501-0 Expanding a Tool for Predicting Chloride Diffusivity in Concrete So It Can Be Used by Manufacturers to Evaluate the Durability of Concrete Made With Blended Cements. Part I: Characterizing Blended Cement...

February 19, 2017
Author(s)
X Feng, Edward Garboczi, Jeffrey W. Bullard, Kenneth A. Snyder, Paul E. Stutzman, T Mason
This report summarizes a project that dealt with the characterization of a fly ash and fly-ash blended cement material, so that these could be incorporated into the Virtual Cement and Concrete Testing Laboratory (VCCTL) software. The information generated

The ACBM/NIST Computer Modelling Workshop: 1990-1998

February 19, 2017
Author(s)
Edward Garboczi
Introduction to, survey of, and advertisement for the ACBM/NIST Computer Modelling Workshop, over the years 1990-1998. This workshop is to train people in the computational materials science of concrete, as developed at NIST under ACBM. To appear in a bi

Particle shape effects on particle size measurement for crushed waste glass

December 18, 2016
Author(s)
Kyle Riding, Mohammadreza Mirzohosseini, Edward Garboczi
Recently, narrow particle size distributions, as measured by sieve analysis, of crushed waste glass were used as a replacement for Portland cement in concrete. Their chemical reactivity was successfully studied as a function of this measure of particle

Irreversible Desiccation Shrinkage of Cement Paste Caused by Cement Grain Dissolution

November 23, 2016
Author(s)
Xiaodan Li, Zachary Grasley, Jeffrey W. Bullard, Edward Garboczi
When cementitious materials are dried, internal stresses are generated that lead to desiccation shrinkage. A portion of this shrinkage is irreversible. Based on previous research indicating that dissolution of cement grains while a cementitious composite

A Q-band free-space characterization of carbon nanotube composites

September 19, 2016
Author(s)
Ahmed M. Hassan, Jan Obrzut, Edward Garboczi
We present a free-space measurement technique for non-destructive non-contact electrical and dielectric characterization of nano-carbon composites in the Q-band frequency range of 30 GHz to 50 GHz. The experimental system and error correction model

Giant surface conductivity enhancement in a carbon nanotube composite by ultraviolet light exposure

July 29, 2016
Author(s)
Christian J. Long, Nathan D. Orloff, Kevin A. Twedt, Thomas F. Lam, Luis Fernando Vargas Lara, Minhua Zhao, Bharath NMN Natarajan, Keana C. Scott, Eric Marksz, Tinh Nguyen, Jack F. Douglas, Jabez J. McClelland, Edward J. Garboczi, Jan Obrzut, James A. Liddle
Carbon nanotube composites are lightweight, multifunctional materials with readily adjustable mechanical and electrical properties—relevant to the aerospace, automotive, and sporting goods industries as high-performance building materials. Here, we combine
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