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Author: dale bentz
Displaying records 11 to 20 of 168 records.
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11. A Comparison Study of Portland Cement Hydration Kinetics as Measured by Chemical Shrinkage and Isothermal Calorimetry
Xueyu Pang, Dale P Bentz, Christian Meyer, Gary Funkhouser, Robert Darbe
Two different methods of evaluating cement hydration kinetics, namely chemical shrinkage and isothermal calorimetry tests, are used to investigate the early stage hydration of different classes of oilwell cement at various temperatures. For a given c ...
12. Modeling of the Influence of Transverse Cracking on Chloride Penetration into Concrete
Dale P Bentz, Edward Joseph Garboczi, Yang Lu, Nicos Martys, Aaron Richard Sakulich, William Jason Weiss
Concrete service life models have proliferated in recent years due to increased interest in designing infrastructure elements with at least a 75-year service life, along with greater emphasis on life cycle costing in general. While current models con ...
13. Measurement Science Needs for the Expanded Use of Green Concrete: Workshop Summary Report
Technical Note (NIST TN)
Kenneth Alan 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 conc ...
14. Improving Concrete Bridge Decks with Internal Curing
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 increa ...
15. Quantifying Residual Stress Development and Reserve Strength in Restrained Internally Cured Concrete
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 s ...
16. Using Limestone to Reduce Set Retardation in High Volume Fly Ash Mixtures: Improving Constructability for Sustainability
Lisa Renay 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 quanti ...
17. Mitigation of Autogenous Shrinkage in Alkali Activated Slag Mortars by Internal Curing
Aaron Richard 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 hurdl ...
18. Modeling Chloride transport in Cracked Concrete: A 3-D image-based microstructure simulation
Edward Joseph Garboczi, Dale P Bentz, Jeffrey M Davis, Yang Lu
The prediction of the service life of concrete materials is difficult, mainly because of their complex heterogeneous microstructure and their random nature. Studying the presence of cracks in concrete and their effect on chloride transport and reacti ...
19. Relating Compressive Strength to Heat Release in Mortars
Dale P Bentz, Tim Barrett, Igor de la Varga, William Jason Weiss
Conventionally, isothermal calorimetry and ASTM C186 heat of hydration results are reported on a per mass of cement (powder) basis, with typical units being J/g cement for example. Based on the recognition that it is the filling of porosity with hyd ...
20. Application of Internal Curing for Mixtures Containing High Volumes of Fly Ash
Igor de la Varga, Javier Castro, Dale P Bentz, Jason Weiss
Sustainability has become an important issue in the concrete industry in recent years. One way to make concrete more sustainable is through the replacement of portland cement clinker with alternative cementitious materials such as fly ash. While fly ...