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Buildings & Construction

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Displaying 401 - 425 of 924

Identifying improved standardized tests for measuring cement particle size and surface area

April 1, 2013

Author(s)

Chiara F. Ferraris, Edward J. Garboczi

The Blaine fineness (Blaine) of a cement powder is a single parameter that is meant to characterize the specific surface area of a cement, and is assumed to be linked to physical and mechanical properties such as strength, setting time, and rheology. A

Contact function, uniform-thickness shell volume, and convexity measure for 3D star-shaped random particles

March 15, 2013

Author(s)

Edward J. Garboczi, Jeffrey W. Bullard

Using a spherical harmonic series, the three-dimensional shape of star-shaped particles can be represented mathematically as readily as can a sphere, cube, or ellipsoid. In principle, any particle parameter, such as volume, surface area, moment of inertia

Polymer chain dynamics in weakly intercalated polymer/nanoplatelet mixtures

March 15, 2013

Author(s)

Kevin A. Masser, Hongyi Yuan, Chad R. Snyder, Alamgir Karim

The dynamics of two chemically similar type-A polymers, poly(epsilon-caprolactone) (PCL) and poly(lactic acid) (PLA) with small amounts of Cloisite 30B nanoplatelets were investigated via broadband dielectric relaxation spectroscopy. The terminal

Alkali-Silica Reaction Degradation of Nuclear Power Plant Concrete Structures: A Scoping Study

March 11, 2013

Author(s)

Kenneth A. Snyder, Hai S. Lew

Alkali-silica reaction (ASR) is a concrete degradation phenomenon in which the alkalis that are typically found in concrete react with certain amorphous or micro-crystalline siliceous phases in the aggregate and, in the presence of moisture, form an

Hydrated phases and pore solution composition in cement-solidified saltstone waste forms

March 8, 2013

Author(s)

Kenneth A. Snyder, Paul E. Stutzman, Jacob Philip, David W. Esh

The mineral phases and pore solution composition of hydrated cement-solidified saltstone waste forms are quantified using thermogravimetric analysis, quantitative X-ray diffraction, and inductively-coupled plasma. The results suggest that, after 6 months

Adhesion Society Meeting Proceedings

March 3, 2013

Author(s)

Rebecca Ploeger, Aaron M. Forster, Donald L. Hunston, Etienne de la Rie, Christopher McGlinchey

Consolidating adhesives have been used throughout the centuries for the conservation of painted cultural objects- such as paintings and polychrome sculpture- and if it were not for these adhesives, many objects may not have survived to the present day

Measurement Science Needs for the Expanded Use of Green Concrete: Workshop Summary Report

February 6, 2013

Author(s)

Kenneth A. Snyder, Dale P. Bentz, Jeffrey W. Bullard, Chiara F. Ferraris, Nicos Martys, Paul E. Stutzman

In July 2012, NIST conducted the Green Concrete Workshop to bring together stakeholders from the concrete construction industry and identify critical needs for the expanded use of industrial by- product materials, such as fly ash and slag, in concrete

Improving Concrete Bridge Decks with Internal Curing

February 1, 2013

Author(s)

Jason Weiss, Dale P. Bentz, Carmelo DiBella

Transportation agencies strive to provide durable, long lasting concrete bridge decks. While high performance concrete is frequently desired due to its resistance to chloride ingress and corrosion, these mixtures are often accompanied with an increased

Identifying improved standardized tests for measuring cement particle size and surface area

January 14, 2013

Author(s)

Chiara F. Ferraris, Edward J. Garboczi

Quantifying Residual Stress Development and Reserve Strength in Restrained Internally Cured Concrete

January 1, 2013

Author(s)

John Schlitter, Dale P. Bentz, Jason Weiss

Concrete can develop tensile stress when it is restrained from shrinking freely. Standard tests, like the restrained ring test (ASTM C1581-09) can be used to quantify how likely a mixture may be to crack under constant temperature conditions. The

Standard Operating Procedures for Smolder Ignition Testing of Upholstery Fabrics

December 11, 2012

Author(s)

Rick D. Davis, Mauro Zammarano, Szabolcs Matko, Roland H. Kraemer

This manuscript describes a methodology to measure the influence of an upholstery cover fabric to promote smoldering mass loss of a small-scale mock-up. The primary test metric is total mock-up mass loss after 45 min exposure to the smoldering ignition

Using Limestone to Reduce Set Retardation in High Volume Fly Ash Mixtures: Improving Constructability for Sustainability

December 3, 2012

Author(s)

Lisa R. Gurney, Dale P. Bentz, Taijiro Sato, Jason Weiss

From a sustainability perspective, high volume fly ash (HVFA) concretes are attractive not only because of the reduction in cement content and its associated greenhouse gases that they provide, but also because they avoid landfilling excessive quantities

Mitigation of Autogenous Shrinkage in Alkali Activated Slag Mortars by Internal Curing

November 19, 2012

Author(s)

Aaron R. Sakulich, Dale P. Bentz

Alkali activated slag shows considerable promise as an environmentally friendly alternative to binders produced from ordinary portland cement (OPC). The shrinkage behavior of alkali activated slags, however, is not well understood, and is a hurdle to

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