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Buildings & Construction

Building materials

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Displaying 426 - 450 of 924

Bridging the gap between random microstructure and 3-D meshing

November 10, 2012
Author(s)
Edward Garboczi, Yang Lu
There are different ways of mathematically representing 3-D heterogeneous material structures. But for each of these methods, usually the desired end result is a 3-D finite element mesh that will be used to investigate the mechanical properties of the

Factors Influencing the Smoldering Performance of Polyurethane Foam

September 26, 2012
Author(s)
Mauro Zammarano, Szabolcs Matko, Roland H. Kraemer, Rick D. Davis, Jeffrey W. Gilman, Shivani N. Mehta
The objective of this study was to evaluate whether polyurethane foam (PUF) could be produced as a standard reference material for ultimate use in a standard test intended to ensure the smoldering performance of commercially available upholstered furniture

An Argument for Virtual Testing in the Cement Plant

September 10, 2012
Author(s)
Pichet Sahachaiyunta, Kittisak Pongpaisanseree, Jeffrey W. Bullard, Paul E. Stutzman, Edward Garboczi, Wilasa Vichit-Vadakan
The cement industry is moving toward customized commodity products, requiring plants that were built to consistently produce thousands of tons of one product each day to now be versatile enough to fine-tune multiple products that meet both industry

Relating Compressive Strength to Heat Release in Mortars

September 4, 2012
Author(s)
Dale P. Bentz, Tim Barrett, Igor de la Varga, William J. Weiss
Conventionally, isothermal calorimetry and ASTM C186 heat of hydration results are reported on a per mass of cement (powder) basis, with typical units being J/g cement for example. Based on the recognition that it is the filling of porosity with hydration

Assessment of Factors Affecting Fire Performance of Mattresses: A Review

September 3, 2012
Author(s)
Rick D. Davis, Shonali Nazare, Kathryn M. Butler
An in-depth analysis of U.S. residential fire statistics shows that although the total number of fires and deaths due to mattress fires has dropped as a result of several regulatory approaches, the mattress/bedding fires continue to account for one of the

Service Life Prediction for Sealants

August 27, 2012
Author(s)
Christopher C. White, Donald L. Hunston, Kar T. Tan
Previous industry consensus postulated that four elements of the weather: Temperature, Humidity, Ultraviolet Radiation, and Mechanical loading were responsible for the majority of the changes observed in sealants exposed to outdoor weathering. The NIST

Application of Internal Curing for Mixtures Containing High Volumes of Fly Ash

August 1, 2012
Author(s)
Igor de la Varga, Javier Castro, Dale P. Bentz, Jason Weiss
Sustainability has become an important issue in the concrete industry in recent years. One way to make concrete more sustainable is through the replacement of portland cement clinker with alternative cementitious materials such as fly ash. While fly ash is

Using Viscosity Modifiers to Reduce Effective Diffusivity in Mortars

August 1, 2012
Author(s)
Kenneth A. Snyder, Dale P. Bentz, Jeffrey M. Davis
Three viscosity modifiers (a commercial shrinkage-reducing admixture, a polypropylene glycol, and cellulose ether) are used to reduce the effective diffusivity of chloride ions through mortars during a one-year exposure. Two delivery mechanisms were

Certification of SRM 2492: Bingham Paste Mixture for Rheological Measurements

June 7, 2012
Author(s)
Chiara F. Ferraris, Paul E. Stutzman, William F. Guthrie
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 is rotating [1]. Usually, the angular velocity is imposed and the response of the material

Elastic and Viscoelastic Properties of Calcium Silicate Hydrate

May 15, 2012
Author(s)
Zachary Grasley, Jones Christopher, X Li, Edward Garboczi, Jeffrey W. Bullard
In order to effectively predict the mechanical properties of concrete and other cementitious materials, it is useful to understand the properties and deformation mechanisms on the nano-metric length scale. Through a combined analytical, experimental, and
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