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Displaying 701 - 725 of 925

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

Technique for Monitoring Environmentally Induced Changes in Polymeric Sealants

December 17, 2008

Author(s)

Donald L. Hunston, Kar T. Tan, Christopher C. White

A new procedure was developed to utilize stress relaxation tests to monitor damage induced in sealant materials exposed to environmental variables and changing strains. By combining tension and compression tests, it was possible to monitor both molecular

Instrumented Indentation for Quantifying Quasi-static and Transient Properties of Polymeric Coatings

November 26, 2008

Author(s)

Aaron M. Forster, Peter Krommenhoek, Li Piin Sung, Chris A. Michaels, Kurt Wood

Instrumented indentation was used to investigate the mechanical properties of coatings for automotive and architectural applications. First, the mechanical properties in the cross-section of a multi-layer acrylic-melamine automotive coating subjected to

X-ray Microtomography Studies of Air-Void Instability and Growth during Drying of Tile Adhesive Mortars

November 1, 2008

Author(s)

Dale P. Bentz, C Haecker

A previous X-ray absorption study of tile adhesive mortars [1] identified a new phenomenon during drying, namely the movement of small cement particles from the interior of the specimen to its surface. An analysis based on Stokes equation indicated that

Etude de la mesure de la contrainte seuil l aide d une plaque mobile : application aux p tes de ciment

October 1, 2008

Author(s)

Vincent Picandet, Chiara C. Ferraris

Un dispositif de conception assez simple a été développé pour mesurer directement le seuil de cisaillement de diverses suspensions concentrées. Il consiste en une plaque immergée verticalement dans le matériau étudié et sur laquelle on vient imposer un

Effect of Annealing Condition and Composition on the Scratch Behavior of Fluorinated Coatings

September 24, 2008

Author(s)

Li Piin Sung, Aaron M. Forster, K Wood

Fluorinated and acrylic coatings are commonly used as binders for exterior coatings because of their excellent resistance to UV radiation and many corrosive chemical agents. It is known that the fluorinated component of the coating usually has a lower

Effect of Composition and Processing Condition on Microstructural Properties and Durability of Fluoropolymer/Acrylic Blends

September 24, 2008

Author(s)

Li Piin Sung, Xiaohong Gu, Derek L. Ho, Forrest A. Landis, D Nguyen

Fluoropolymer-based coatings have been greatly used as binders for exterior coatings because of their excellent resistance to UV radiation as well as to many corrosive chemical agents. It is also known that the fluorinated component usually has a lower

Elastic Modulus Characterization of Nanocomposite Latex Coatings

September 24, 2008

Author(s)

Aaron M. Forster, Stephanie S. Watson, Jonathan White

The elastic modulus of a polystyrene-butyl acrylate latex coating was measured using three different techniques: instrumented indentation, dynamic mechanical analysis, and tensile testing. The coating was formulated with 25 nm and 250 nm diameter TiO2

Characterizing the Non-Linear Viscoelastic Properties of Sealant Including the Mullins Effect

September 23, 2008

Author(s)

Christopher C. White, Donald L. Hunston

Quantification of the mechanical properties, such as the non-linear viscoelastic behavior, for a cured sealant is complicated by the presence of the Mullins Effect. The Mullins Effect, commonly observed in elastomers, refers to an observed increase in the

Amorphous Calcium Phosphate Based Composites: Effect of Surfactants and Poly(Ethylene Oxide) on Filler and Composite Properties

August 19, 2008

Author(s)

Joseph M. Antonucci, Da-Wei Liu, Drago Skrtic

The uncontrolled aggregation of amorphous calcium phosphate (ACP) particulate fillers and their uneven distribution within polymer matrices can have adverse effects on the properties of ACP composites. In this paper we assessed the influence of non-ionic

Effect of Chemical Structure and Composition of the Resin Phase on Vinyl Conversion of Amorphous Calcium Phosphate-Filled Composites

August 18, 2008

Author(s)

Drago Skrtic, Joseph M. Antonucci

The objective of this study was to elucidate the effect of chemical structure and composition of the polymer matrix on the degree of vinyl conversion (DC) of copolymers (unfilled resins) and their amorphous calcium phosphate (ACP) composites attained upon

Light-Cured Dimethacrylate-Based Resins and Their Composites: Comparative Study of Mechanical Strength, Water Sorption and Ion Release

July 30, 2008

Author(s)

Justin N. O'Donnell, Sarah Langhorst, Michael D. Fow, Joseph M. Antonucci, Drago Skrtic

This study explores how resin type affects selected physicochemical properties of complex methacrylate copolymers and their amorphous calcium phosphate (ACP)-filled and glass-filled composites. Two series of photo-polymerizable resin matrices were

Thermo-viscoelastic Analysis and Creep Testing of Ambient Cure Epoxy Adhesives Used in Construction Applications

July 30, 2008

Author(s)

Joannie W. Chin, Donald L. Hunston, Aaron M. Forster, Justin M. Ocel, Jean M. Hartmann, Paul Fuchs

Epoxies are increasingly used in construction for structural applications and properties such as creep are very important. For this reason, the thermo-viscoelastic properties and creep response of two commercial, ambient cure structural epoxy adhesives

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