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Materials

Concrete/cement

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Displaying 51 - 75 of 179

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

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

Role of Materials Science in the Resilience of the Built Environment

December 5, 2017
Author(s)
Stephanie S. Watson, Chiara C. Ferraris, Jason D. Averill
The resilience of U.S. communities, defined as the "ability to withstand and recover rapidly from disruptive events," is directly dependent upon the ability of the built environment to maintain and support the functions upon which modern society has come

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

Certification of SRM 2493:Standard Reference Mortar for Rheological Measurements

October 4, 2017
Author(s)
Alex Olivas, Chiara C. Ferraris, Nicos Martys, Edward Garboczi, Blaza Toman, William L. George
Rheological measurements are often performed using a rotational rheometer. In this type of rheometer, the tested fluid is sheared between two surfaces, one of which acts as the rotating surface [1]. Usually, the rotational velocity is imposed and the

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

Topological Controls on the Dissolution Kinetics of Glassy Aluminosilicates

August 17, 2017
Author(s)
Tandre Oey, Isabella Pignatelli, Yingtian Yu, Narayanan Neithalath, Jeffrey W. Bullard, Mathieu Bauchy, Gaurav Sant
Fly ash which encompasses a mixture of glassy and crystalline aluminosilicates is an abundant supplementary cementitious material (SCM), valuable for replacing ordinary portland cement (OPC) as the binder fraction in concrete. As a result of the demand for

An Improved Basis for Characterizing the Suitability of Fly Ash as a Cement Replacement Agent

June 7, 2017
Author(s)
Tandre Oey, Jason Timmons, Paul Stutzman, Jeffrey W. Bullard, Magdalena Balonis, Mathieu Bauchy, Gaurav Sant
Fly ash is a critical yet underutilized material for partial replacement for ordinary portland cement (OPC) in the binder fraction of a concrete. Significant compositional variability, and a lack of rigorous classification methods currently limit fly ash

Role of Rheology in Achieving Successful Concrete Performance

June 1, 2017
Author(s)
Chiara C. Ferraris
Workability is one of the most important properties of concrete as it determines how easily the material can be placed. Workability affects many aspects of a concrete construction, including productivity (e.g. casting rate), processing (e.g. finishing)

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

Cements in the 21st Century: Challenges, Perspectives, and Opportunities

April 21, 2017
Author(s)
Joseph J. Biernacki, Jeffrey W. Bullard, Gaurav Sant, Nemkumar Banthia, Frederik P. Glasser, Scott Jones, Tyler Ley, Richard A Livingston, Luc Nicoleau, Jan Olek, Florence Sanchez, Rouzbeh Shahsavari, Paul E. Stutzman, Sobolev Konstantin, Tracie Prater
In a book published in 1906, Richard Meade outlined the history of portland cement up to that point1. Since then there has been great progress in portland cement-based construction materials technologies brought about by advances in the materials science
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