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Displaying 351 - 375 of 487

Predicting Material In-Service Performance using the NIST SPHERE

June 17, 2009
Author(s)
Christopher C. White, Donald L. Hunston, Kar T. Tan
Selecting a polymeric material for an application exposed to outdoor weathering is a challenging task. The proper selection requires knowledge of the behavior of the material, which is a complex mixture involving the integration of rheology, reliability

The Origin of Critical Relative Humidity in Adhesion

May 11, 2009
Author(s)
Christopher C. White, Kar T. Tan, Bryan D. Vogt, Donald L. Hunston
Water is ubiquitous in the atmosphere. Unfortunately, adhesive bonding is susceptible to the environmental attack of water leading to significant depreciation in joint strength and subsequently to premature failures [1-6]. This susceptibility of bonding to

Predicting the Permeability of Pervious Concretes from Planar Images

May 1, 2009
Author(s)
Milani S. Sumanasooriya, Dale P. Bentz, Narayanan Neithalath
This paper discusses the reconstruction of three-dimensional material structures of pervious concretes using two-dimensional digital images obtained from actual specimens, and computational permeability predictions using these reconstructed three

Impact of polymer modulus on water accumulation at polymer / metal oxide interfaces

April 1, 2009
Author(s)
Alper Karul, Kar T. Tan, Christopher C. White, Donald L. Hunston, Steve marshall, Bulent Akgun, Sushil K. Satija, Christopher Soles, Bryan D. Vogt
Ambient moisture is known to accumulate at the interface between polymers and metal oxides, leading to detrimental consequences on physical properties such as modulus and adhesion. Direct measurement of the interfacial profile has utilized neutron

Development of a Powered Outdoor Sealant Fatigue Test Apparatus

March 18, 2009
Author(s)
Christopher C. White, R. S. Williams, Steve Lacher, Corey C. Halpin
A new cyclic fatigue test apparatus (CFTA) was developed at the USDA Forest Service, Forest Products Laboratory. The new CFTA is computer-controlled and powered by electric linear actuators. Computer control allows the CFTA to subject specimens to specific

Adhesion Research at the National Institute of Standard and Technology (NIST)

March 11, 2009
Author(s)
Donald L. Hunston, Christopher M. Stafford
Over the years, NIST has been very active in adhesion research. Although there has never been an organizational group or large-scale program that focused specifically on this topic, a wide variety of projects have had adhesion, or related properties, as a

Effect of Strain on the Modulus of Sealants Exposed to the Outdoors

March 11, 2009
Author(s)
Christopher C. White, Donald L. Hunston, Kar T. Tan
The effects of applied strain on sealants exposed to outdoor weathering were examined for two sealant formulations, sealants A and C. Both static and dynamic strain was applied to the sealants during the summer in a Gaithersburg, MD-outdoor location. Both

Impact of Polymer Chemistry on the Durability of Model Adhesives Supported on SiOx Substrates in Humid Environments Using Homologous Series of Poly(n-alkyl methacrylate)s

January 7, 2009
Author(s)
Kar T. Tan, Bryan D. Vogt, Christopher C. White, Kristen Hamilton, Nicholas Wagman, Joshua E. Goldman, Jessica M. Torres, Kristen L. Steffens, Cyril Clerici, Sushil K. Satija, Donald L. Hunston
There are many advantages that structural adhesives can offer compared to the more traditional joining methods, such as welding, bolting, mechanical fastening, etc. However, there are some issues that currently limit the wider application of adhesives. One

VERDiCT: Viscosity Enhancers Reducing Diffusion in Concrete Technology

January 1, 2009
Author(s)
Dale P. Bentz, Max A. Peltz, Kenneth A. Snyder, Jeffrey M. Davis
Our nation's infrastructure and long term containment of nuclear waste are two critical applications requiring concrete with an increased service life. In this paper, a new paradigm for increasing concrete service life is presented. Since diffusion of
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