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Buildings & Construction

Building materials

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Displaying 376 - 400 of 924

Viscosity Modifiers to Enhance Early Age Performance and Long Term Durability of Concrete

September 1, 2013
Author(s)
Dale P. Bentz, Kenneth A. Snyder, Max A. Peltz, K H. Obla, Haejin Kim
The service life distribution of concrete structures typically follows a “bathtub”-shaped function, with a finite probability of early-age failures being followed by a life with a relative low probability of failure that ultimately increases dramatically

Ternary Blends for Economical and Environmentally Friendly Concretes

July 31, 2013
Author(s)
Dale P. Bentz, Jussara Tanesi, Ahmad Ardani
As sustainability moves to the forefront of trends in construction, concrete mixture proportions must be adjusted and adapted to a new set of economic and environmental demands. While high-volume fly ash concretes have been investigated extensively since

Hydrated Phases in Blended Cement Systems and Synthetic Saltstone Grouts

June 10, 2013
Author(s)
Kenneth A. Snyder, Paul E. Stutzman
A blended binder system (10 % portland cement, 45 % fly ash, and 45 % slag) is characterized as part of a broader study of its long-term effectiveness in stabilizing treated salt waste at the Savannah River Site. The binder system is reproduced in the

Assessment of the glassy phase reactivity in fly ashes used for geopolymer cements

June 1, 2013
Author(s)
Paul E. Stutzman, Katherine Aughenbaugh, Maria Juenger
Geopolymer cements have not found widespread use as a portland cement replacement, in part due to the difficulty in proportioning mixtures in a reliable manner. Unlike portland cements, which are mixed with water, geopolymer cements contain caustic

Nanoparticles in Flame-Retardant Coatings for Flexible Polyurethane Foams: Effects on Flammability and Nanoparticle Release

May 15, 2013
Author(s)
Mauro Zammarano, Rick D. Davis, Yeon S. Kim, Richard H. Harris Jr., Marc R. Nyden, Jeffrey W. Gilman, Nasir M. Uddin
Nanoparticles can effectively reduce polymer flammability; however, the impact of nanoparticles on environmental and health safety is still unclear. The purpose of this study is twofold: (1) to develop and investigate the effect of nanoparticle-rich

Development of Standard Reference Materials for Cement-Based Materials

May 13, 2013
Author(s)
Chiara F. Ferraris, Nicos Martys, William L. George
Rheometers are used to determine the rheological properties of materials ranging from mayonnaise to concrete. While rotational rheometers are routinely used for homogeneous materials such as mayonnaise, their usage for characterization of a granular fluid

The Computational Materials Science of Concrete: Past-Present-Future

May 8, 2013
Author(s)
Edward Garboczi
From its small beginnings back in the 1960s, computational materials science has come a long way. The field is currently getting even more exciting with ideas like integrated computational materials engineering [1] being seriously considered in the start

Modeling of the Influence of Transverse Cracking on Chloride Penetration into Concrete

April 23, 2013
Author(s)
Dale P. Bentz, Edward J. Garboczi, Yang Lu, Nicos Martys, Aaron R. Sakulich, William J. Weiss
Concrete service life models have proliferated in recent years due to increased interest in designing infrastructure elements with at least a 75-year service life, along with greater emphasis on life cycle costing in general. While current models consider

Micro/nano-wear studies on epoxy/silica nanocomposites

April 18, 2013
Author(s)
Zhengzhi Wang, Ping Gu, Xiao-ping Wu, Zhong Zhang, Martin Chiang, Hui Zhang
We proposed a new method for quantifying the micro/nano-scale wear volume (i.e., volume of wear loss) in a test to characterize the wear-resistance of nanocomposites. Effects of wear load and pass (a pattern of scan cycles), and nanoparticle content on the
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