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Buildings & Construction

Building materials

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Displaying 276 - 300 of 486

Effect of sample conditioning on the water absorption of concrete

August 1, 2011
Author(s)
Javier Castro, Dale P. Bentz, Jason Weiss
ASTM C1585 is commonly used to determine the absorption and rate of absorption of water in unsaturated hydraulic cement concretes. ASTM C1585 preconditions the samples for a total of 18 days. Unfortunately however, the range of relative humidities that can

Optimization of Cement and Fly Ash Particles to Produce Sustainable Concretes

August 1, 2011
Author(s)
Dale P. Bentz, Andrew Hansen, John Guynn
In the drive to produce more sustainable concretes, considerable emphasis has been placed on replacing cement in concrete mixtures with more sustainable materials, both from a raw materials cost and a CO2 footprint perspective. High volume fly ash

Characterization of Nanoparticle Release from Polymer Nanocomposites Due to Fire

July 6, 2011
Author(s)
Nasir M. Uddin, Marc R. Nyden, Rick D. Davis
Engineered nanoparticles, such as carbon nanotubes (CNTs) and nanofibers (CNFs) are increasingly being used as fire retardants and performance additives in polymeric materials. However, because of their small size and ability to interact with biological

PDH-locked, frequency-stabilized cavity ring-down spectrometer

June 16, 2011
Author(s)
Joseph T. Hodges, A. Cygan, Piotr Maslowski, Katarzyna E. Bielska, S. Wojtewicz, J. Domyslawska, Hisashi Abe, R.S. Trawinski, R. Ciurylo
We describe a high sensitivity and high spectral resolution laser absorption spectrometer based upon the frequency-stabilized cavity ring-down spectroscopy (FS-CRDS) technique. We used the Pound-Drever-Hall (PDH) method to lock the probe laser to the high

Bridging the Micro to Macro Gap: A New Application for Milli-probe X-ray Fluorescence

June 1, 2011
Author(s)
Jeffrey M. Davis, Dale E. Newbury, Nicholas W. Ritchie, Edward P. Vicenzi, Dale P. Bentz, Albert J. Fahey
X-ray elemental mapping and x-ray spectrum imaging are powerful microanalytical tools. However, their scope is limited spatially by the raster area of a scanning electron microscope or microprobe. Limited sampling size becomes a significant issue when

Rheological Characterization of Flow Table Reference Material

April 29, 2011
Author(s)
Chiara F. Ferraris, Haleh Azari
The flow table is a standardized test that is widely used to qualify a mortar to be tested for compressive strength and air content. It is also the only standard test to quantify a mortar workability property. Therefore, the calibration of this device is

Critical Observations for the Evaluation of Cement Hydration Models

April 22, 2011
Author(s)
Dale P. Bentz
The development of computer models for cement hydration and microstructure development that has accelerated in the past 25 years has created a need for a set of critical experimental observations that can be used in evaluating the model predictions. During

LABORATORY ACCELERATED AND NATURAL WEATHERING OF STYRENE-ETHYLENE-BUTADIENE-STYRENE (SEBS) BLOCK COPOLYMER: ACCELERATION AND CORRELATION

March 23, 2011
Author(s)
Kar T. Tan, Christopher C. White, David J. Benatti, Deborah S. Jacobs, Donald L. Hunston
Indoor accelerated and outdoor field weathering of styrene-ethylene-butadiene-styrene block copolymer have been studied by Fourier transform infrared (FTIR) spectroscopy. In the indoor accelerated experiments, specimens are exposed to ultraviolet-visible

The Role of Service Life Prediction In Sustainability Determinations

February 14, 2011
Author(s)
Christopher C. White, Kar T. Tan, Donald L. Hunston
Sustainability calculations are based on assumptions about the energy required to produce, transport place in-service items. A critical component of these calculations is the expected service life of the material, component or system. Estimates of the

Internal Curing: A 2010 State-of-the-Art Review

February 9, 2011
Author(s)
Dale P. Bentz, Jason Weiss
The American Concrete Institute in 2010 defined internal curing as supplying water throughout a freshly placed cementitious mixture using reservoirs, via pre-wetted lightweight aggregates, that readily release water as needed for hydration or to replace

Optimization of Particle Sizes in High Volume Fly Ash Blended Cements

February 2, 2011
Author(s)
Dale P. Bentz, Chiara F. Ferraris, James J. Filliben
One major objective of the sustainable construction movement is to decrease the energy and carbon dioxide footprints of concrete. Since the production of portland cement is a major contributor in both of these areas, concretes with increasing quantities of

New approach to calibrate the mortar flow table

January 27, 2011
Author(s)
Chiara F. Ferraris, Haleh Azari
The flow table is a standardized test that is widely used to qualify a mortar to be tested for compressive strength and air content. It is also the only standard test to quantify a mortar workability property. Therefore, the calibration of this device is

Hotter Cements, Cooler Concretes

January 3, 2011
Author(s)
Dale P. Bentz, Casimir Bognacki, Kyle Riding, Victor Villarreal
In the past 50 years, portland cements have become progressively finer, in order to meet increasing demands for fast-track construction, etc. While finer cements produce higher early-age strengths, they also increase early-age heat release which can

Thermal Properties of High-Volume Fly Ash Mortars and Concretes

January 3, 2011
Author(s)
Dale P. Bentz, Max A. Peltz, Alejandro Duran-Herrera, P Valdez, Cesar Juarez
As sustainability moves to the forefront of construction, the utilization of high volume fly ash concrete mixtures to reduce CO2 emissions and cement consumption per unit volume of concrete placed is receiving renewed interest. Concrete mixtures in which

Evaluation of Sustainable High-Volume Fly Ash Concretes

January 1, 2011
Author(s)
Alejandro Duran-Herrera, Cesar Juarez, P Valdez, Dale P. Bentz
This article presents results of an experimental research work oriented to develop practical tools for the regional concrete industry, as well as to illustrate the potential benefits of the synergistic effect of an ASTM C 618 Class F fly ash (FA) produced
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