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Materials

Concrete / cement

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Displaying 26 - 50 of 176

Structural Performance of Nuclear Power Plant Concrete Structures Affected by Alkali-Silica Reaction (ASR) - Task 2: Assessing Bond and Anchorage of Reinforcing Bars in ASR-Affected Concrete

February 3, 2021
Author(s)
Travis E. Thonstad, Jonathan Weigand, Fahim H. Sadek, Sorin Marcu, timothy J. barrett, Hai S. Lew, Long Phan, Adam L. Pintar
This report describes the results of Task 2 of a five-task comprehensive research program being conducted at the National Institute of Standards and Technology (NIST) under the sponsorship of the U.S. Nuclear Regulatory Commission (NRC). The overall study

Homogenization of Concrete Microstructures in Nuclear Power Plants

December 31, 2020
Author(s)
Christa Torrence, Aishwarya Baranikumar, Zachary Grasley, Edward Garboczi
Nearly all nuclear power plants in the United States are operating past their intended lifetimes or are requesting lifetime extensions, therefore understanding changes to the concrete containment structure over time is crucial to evaluate the structure's

Microstructure Homogenization of Concrete Used in Nuclear Power Plants

December 31, 2020
Author(s)
Edward Garboczi, Christa Torrence, Zachary Grasley, Aishwarya Baranikumar, William Lawrimore
Nearly all nuclear power plants in the United States are operating past their intended lifetimes or are requesting lifetime extensions. Therefore, understanding changes to the concrete containment structure over time is crucial to evaluate the structure's

Designing 3D printable cementitious materials with gel-forming polymers

December 11, 2020
Author(s)
Edward Garboczi, Hajar Taheri Afarani, William carroll, Joseph J. Biernacki
Cement based pastes for 3D printing applications were prepared using hydrogel-forming polymers. Preliminary results suggest that such gel-forming polymers can reduce the need for more complex admixture packages as printing aids. The influence of polymer

Temperature-induced heteroaggregation in polydisperse portlandite suspensions

August 17, 2020
Author(s)
Edward Garboczi, Gaurav Sant, Iman Mehdipour, Narayanan Neithalath, Mathieu Bauchy, Samanvaya Srivastava, Sharu Bhagavathi Kandy
Temperature is well-known to affect the aggregation behavior of colloidal suspensions. This paper elucidates the temperature dependence of the rheology of portlandite (calcium hydroxide: Ca(OH)2) suspensions that feature a high ionic strength and a pH

Dispersing nanosized portlandite particulates via electrosteric exclusion at short screening lengths

March 16, 2020
Author(s)
Jason Timmons, Iman Mehdipour, Shang Gao, Hakan Atahan, Narayanan Neithalath, Mathieu Bauchy, Edward Garboczi, Samanvaya Srivastava, Gaurav Sant
In spite of their high surface charge (ζ = + 34 mV), aqueous suspensions of portlandite (calcium hydroxide: Ca(OH)2) exhibit a strong tendency to aggregate, and thereby present unstable suspensions. While a variety of commercial dispersants seek to modify

Dissolution and Initial Hydration Behavior of Tricalcium Aluminate in Low Activity Sulfate Solutions

January 22, 2020
Author(s)
Alexander Brand, Steven B. Feldman, Paul E. Stutzman, Anton V. Ievlev, Matthias Lorenz, Darren C. Pagan, Sriramya Nair, Justin Gorham, Jeffrey W. Bullard
The effects on cubic tricalcium aluminate (C3A) hydration of alkali or alkaline earth sulfate electrolytes were evaluated by in situ dissolution rate measurements, by ex situ near-surface composition measurements with secondary ion mass spectrometry, and

Potential Use of Lightweight Aggregate (LWA) Produced from Bottom Coal Ash for Internal Curing of Concrete Systems

October 1, 2019
Author(s)
Mohammad Balapour, Weijin Zhao, Edward Garboczi, Nay Ye Oo, Sabrina Spatari, Grace Hsuan, Peter Billen, Yaghoob Farnam
This study evaluates the potential use of a novel lightweight aggregate (LWA), spherical porous reactive aggregate (SPoRA), which is produced from waste coal bottom ash, for internal curing of concrete. Engineering properties of SPoRA required for concrete

Improved Mesoscale Segmentation of Concrete from 3D X-ray Images Using Contrast Enhancers

June 28, 2018
Author(s)
Pietro Carrara, Rolands Kruse, Dale P. Bentz, M Lunardelli, Thorsten Leusmann, P Varady, Laura De Lorenzis
Obtaining the mesostructure of concrete from X-ray computed tomography (CT) requires segmentation of the data into distinct phases, a process complicated by the limited contrast between aggregates and mortar matrix. This paper explores the possibility to

Performance Testing of Hydraulic Cements: Measuring Sulfate Resistance

May 25, 2018
Author(s)
Chiara C. Ferraris, Paul Stutzman, Max A. Peltz
The sulfate resistance of cements used in the construction industry is traditionally assessed by measuring the expansion of a prism of 280 mm (11inch) length and 25 mm (1 inch) square cross section immersed in a sodium sulfate solution for at least one
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