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Materials

Concrete / cement

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Displaying 226 - 250 of 292

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

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

Modeling Cement Hydration Kinetics Using the Equivalent Age Concept

March 29, 2012
Author(s)
Xueyu Pang, Dale P. Bentz, Christian Meyer
In this study the hydration kinetics of four different types of cements during early ages were investigated by both chemical shrinkage and isothermal calorimetry tests. Chemical shrinkage tests were performed at both different temperatures and pressures

Internal Curing - Constructing More Robust Concrete

January 19, 2012
Author(s)
Jason Weiss, Dale P. Bentz, Anton Schlinder, Pietro Lura
It is often said that there are two types of concrete: concrete that has cracked and concrete that is going to crack. Unfortunately, this is true all too frequently. Many of these unwanted cracks develop shortly after the concrete is placed and in addition

Modeling and Simulation of Cement Hydration Kinetics and Microstructure Development

December 22, 2011
Author(s)
Jeffrey Thomas, Joseph J. Biernacki, Jeffrey W. Bullard, Shashank Bishnoi, Jorge S. Dolado, George W. Scherer, Andreas Luttge
This review endeavors to summarize the past 40 years or so of progress towards the development of mathematical models for understanding and predicting cement hydration behavior. A complete and accurate model of hydration would enable materials engineers

Why Alite Stops Hydrating Below 80% Relative Humidity

September 1, 2011
Author(s)
Robert J. Flatt, George W. Scherer, Jeffrey W. Bullard
Cement hydration continues to have an intriguing character, surrounded as it is by a number of intensively debated questions. Among the unresolved issues is the reason why hydration stops at a relative humidity of about 80%, even though the system still

Effect of sample conditioning on the water absorption of concrete

August 1, 2011
Author(s)
Javier Castro, Dale P. Bentz, Jason Weiss
ASTM C1585 is commonly used to determine the absorption and rate of absorption of water in unsaturated hydraulic cement concretes. ASTM C1585 preconditions the samples for a total of 18 days. Unfortunately however, the range of relative humidities that can

From Electrons to Infrastructure: Engineering Concrete From The Bottom Up

April 6, 2011
Author(s)
Hamlin M. Jennings, Jeffrey W. Bullard
We argue that only an approach rooted in fundamental, mechanistic models of concrete materials offers a viable path for handling the enormous number of new variables that are being introduced as new materials are added to the design space, and as new

Advancing the materials science of concrete with supercomputers

January 24, 2011
Author(s)
Jeffrey W. Bullard, Edward Garboczi, William L. George, Nicos Martys, Steven G. Satterfield, Judith E. Terrill
Supercomputers are renowned for being used on grand challenge problems like global weather patterns, nuclear device virtual testing, galaxy formation, unraveling molecular structure - and now concrete! Why do the mysteries of concrete form this kind of a
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