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Displaying 176 - 200 of 492

Uncertainty in Bogue-Calculated Phase Composition of Hydraulic Cements

July 1, 2014
Author(s)
Paul E. Stutzman
The Bogue calculations of cement composition are used for manufacturing process control and cement classification. While it is commonly understood that the Bogue calculations are estimates with potential intrinsic biases, the magnitudes of such biases are

Measuring Freeze and Thaw Damage in Mortars Containing Deicing Salt Using a Low Temperature Longitudinal Guarded Comparative Calorimeter and Acoustic Emission (AE-LGCC)

June 23, 2014
Author(s)
Yaghoob Farnam, Dale P. Bentz, Aaron R. Sakulich, Daniel R. Flynn, Jason Weiss
Deicing salts are often applied to the surface of pavements and bridge decks in the winter to melt ice; thereby improving safety for the travelling public. In this paper, the influence of NaCl deicing salt on freezing and thawing temperatures of pore

Effects of Temperature on Surface Accumulation and Release of Silica Nanoparticles in an Epoxy Nanocoating Exposed to UV Radiation

June 16, 2014
Author(s)
Chun-Chieh Tien, Ching-Hsuan Chang, Bernard Hao-Chih Liu, Deborah Jacobs, Savelas A. Rabb, Lee L. Yu, Tinh Nguyen, Li Piin Sung
Polymer nanocoatings are increasingly used outdoors and in harsh environments. However, because most common polymers degraded by the weathering elements, nanoparticles in polymer nanocoatings may be released into the environments. Such nanoparticle release

Spray-deposition and photopolymerization of organic-inorganic thiol-ene resins for fabrication of superamphiphobic surfaces

June 9, 2014
Author(s)
Li Xiong, Laken Kendrick, Hannele Heusser, Bradley J. Sparks, Christopher Stafford, James T. Goetz, Sergei Nazarenko, Derek L. Patton
Superamphiphobic surfaces, exhibiting high contact angles and low contact angle hysteresis to both water and low surface tension liquids, have attracted a great deal of attention in recent years due to the importance in many practical applications. In this

DNA-based Nanocomposite Bio-Coatings for Fire Retarding Polyurethane Foam

May 2, 2014
Author(s)
Yu-Chin Li, Yeon S. Kim, John R. Shields, Rick D. Davis
Layer-by-Layer (LbL) assembled multilayer thin films of deoxyribonucleic acid (DNA), chitosan (CHI), and montmorillonite (MMT), were studied in an effort to produce fully renewable, bio-based fire retardant coatings for flexible polyurethane foam. The PUF

A Quantitative Study of Nanoparticle Release from Nanocoatings Exposed to UV Radiation

April 7, 2014
Author(s)
Li Piin Sung, Deborah S. Jacobs, Justin M. Gorham, Savelas A. Rabb, Xiaohong Gu, Lee L. Yu, Tinh Nguyen
Nanoparticles are increasingly used in polymer coatings (i.e., nanocoatings) to improve multiple properties of traditional coatings such as mechanical, electrical, gas barrier, and UV resistance. These high performance nanocoatings are often used in

Influence of Internal Curing and Viscosity Modifiers on Resistance to Sulfate Attack

April 1, 2014
Author(s)
Dale P. Bentz, Jeffrey M. Davis, Max A. Peltz, Kenneth A. Snyder
Sulfate attack is one of the common degradation mechanisms for concrete in severe environments. While various strategies for minimizing sulfate attack are well recognized, including using an ASTM C150 Type V cement and/or reducing water-to-cementitious

Role of salt on adhesion of an epoxy/aluminium (oxide) interface in aqueous environments

February 16, 2014
Author(s)
Christopher C. White, Kar T. Tan, Donald L. Hunston, Justin M. Gorham, Aaron M. Forster, Vogt D. Bryan
The durability of adhesive joints in hostile environments is a major area of concern in structural adhesive bonding. Therefore, understanding the mechanics and mechanisms of degradation of adhesive joints is a key factor for more extensive use in future

Corrosion Detection in Concrete Rebars Using a Spectroscopic Technique

January 11, 2014
Author(s)
Edward J. Garboczi, Paul E. Stutzman, Shuangzhen S. Wang, Nicos Martys, Dat Duthinh, Virgil Provenzano, Shin G. Chou, David F. Plusquellic, Jack T. Surek, Sung Kim, Robert D. McMichael, Mark D. Stiles, Ahmed M. Hassan
Detecting the early corrosion of steel in reinforced concrete is a goal that has been much pursued. Since 2010, NIST has been working on a large project to develop an electromagnetic (EM) probe that detects the actual corrosion products via spectroscopic
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