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Displaying 1 - 25 of 80

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

Relating the Electrical Resistance of Fresh Concrete to Mixture Proportions

March 5, 2018
Author(s)
K H. Obla, Rongjin Hong, Stuart Sherman, Dale P. Bentz, Scott Jones
Characterization of fresh concrete is critical for assuring the quality of our nation's constructed infrastructure. While fresh concrete arriving at a job site in a ready-mixed concrete truck is typically characterized by measuring temperature, slump, unit

A Multiscale Framework for the Prediction of Concrete Self-Desiccation

March 1, 2018
Author(s)
Madura Pathirage, Dale P. Bentz, Giovanni Di Luzio, Enrico Masoero, Gianluca Cusatis
Cement hydration in concrete and mortar has been studied thoroughly over the past 50 years. To fully understand hydration in concrete and predict the evolution of the hygral, thermal, and mechanical properties at the structural level, one needs to study

Evaluating the Hydration of High Volume Fly Ash Mixtures Using Chemically Inert Fillers

December 6, 2017
Author(s)
Igor de la Varga, Javier Castro, Dale P. Bentz, Franco Zunino, Jason Weiss
Fly ash is frequently used as a replacement for cement in concrete. However, questions remain regarding the influence that fly ash has on the hydration of cement. This paper examines physical aspects (e.g., surface nucleation, cement particles spacing) and

Final Report for Project BAA No. DTFH61-08-R-00034: Greatly Increased Use of Fly Ash in Hydraulic Cement Concrete (HCC) for Pavement Layers and Transportation Structures (Phase II - Tasks 4 and 5)

November 17, 2017
Author(s)
Igor de la Varga, Dale P. Bentz, Jason Weiss
This report serves as the final report for a research project focused on increasing the usage of fly ash in transportation infrastructure. Specifically, this report addresses two phases of the research dealing with internal curing and early-age cracking

Bond Enhancement of Repair Mortar via Biodeposition

September 4, 2017
Author(s)
Didier Snoeck, Jianyun Wang, Dale P. Bentz, Nele De Belie
The bond between repair mortars and existing concrete substrates is critical for the long-term performance and durability of the repaired structure. The carbonation state of the substrate is one of the parameters that may affect this bond strength. The

Assessing Ash Quality and Performance

May 3, 2017
Author(s)
Larry Sutter, Dale P. Bentz
This chapter reviews ash quality and performance issues, with special emphasis on air entrainment and early-age performance. Recent developments in testing procedures are reviewed and recommendations are provided for standardized testing. One of the key

Leaching of Conductive Species: Implications to Measurements of Electrical Resistivity

February 20, 2017
Author(s)
Robert Spragg, Scott Jones, Yiwen Bu, Yang Lu, Dale P. Bentz, Kenneth A. Snyder, Jason Weiss
Electrical tests have been used to characterize the microstructure of porous materials, the measured electrical response being determined by the contribution of the microstructure (porosity and tortuosity) and the electrical properties of the solution

Neutron Radiography Measurement of Salt Solution Absorption in Mortar

February 1, 2017
Author(s)
Catherine Lucero, Robert Spragg, Dale P. Bentz, Daniel S. Hussey, David L. Jacobson, Jason Weiss
A portion of the concrete pavements in the US have recently been observed to have premature joint deterioration. While this damage has been attributed to a wide variety of potential factors, it is hypothesized that one component of this damage can be

Modeling and Measuring Chloride Ingress into Cracked Mortar

August 7, 2016
Author(s)
Scott Jones, Jeffery Davis, John L. Molloy, John R. Sieber, Dale P. Bentz
Chloride ingress into reinforced concrete structures is responsible for initiating corrosion of steel embedded into concrete. To aide in the prediction of concrete service life, a chloride ingress model that includes chloride binding to the cement matrix

Effect of a micro-copolymer addition on the thermal conductivity of fly ash mortars

November 5, 2015
Author(s)
Alejandro Duran-Herrera, Joana K. Campos-Dimas, P Valdez, Dale P. Bentz
In this study, a copolymer composed of hollow spherical particles with an average particle size of 90 µm was evaluated as a lightweight aggregate in Portland cement-fly ash mortars to improve the thermal conductivity (k) of the composite. Mortars were

Numerical Simulation of Heat and Mass Transport during Hydration of Portland Cement Mortar in Semi-adiabatic and Steam Curing Conditions

October 22, 2015
Author(s)
Emilio Hernandez-Bautista, Dale P. Bentz, Sadoth Sandoval-Torres, Prisciiano Cano Barrita
The mass and heat transport during steam curing of concrete has a bearing on both the mechanical and durability properties. Therefore, it is essential to take into account the temperature evolution and the moisture distribution to prevent premature damage
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