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Author: dale bentz

Displaying records 21 to 30 of 171 records.
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21. Using Limestone to Reduce Set Retardation in High Volume Fly Ash Mixtures: Improving Constructability for Sustainability
Published: 12/3/2012
Authors: Lisa Renay Gurney, Dale P Bentz, Taijiro Sato, Jason Weiss
Abstract: 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909251

22. Mitigation of Autogenous Shrinkage in Alkali Activated Slag Mortars by Internal Curing
Published: 11/19/2012
Authors: Aaron Richard Sakulich, Dale P Bentz
Abstract: 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911271

23. Modeling Chloride transport in Cracked Concrete: A 3-D image-based microstructure simulation
Published: 10/3/2012
Authors: Edward Joseph Garboczi, Dale P Bentz, Jeffrey M Davis, Yang Lu
Abstract: 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912153

24. Relating Compressive Strength to Heat Release in Mortars
Published: 9/4/2012
Authors: Dale P Bentz, Tim Barrett, Igor de la Varga, William Jason Weiss
Abstract: 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910338

25. Application of Internal Curing for Mixtures Containing High Volumes of Fly Ash
Published: 8/1/2012
Authors: Igor de la Varga, Javier Castro, Dale P Bentz, Jason Weiss
Abstract: 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910049

26. Increasing the Service Life of Bridge Decks by Incorporating Phase Change Materials (PCMs) to Reduce Freeze/Thaw Cycles
Published: 8/1/2012
Authors: Aaron Richard Sakulich, Dale P Bentz
Abstract: During a freezing event, pore solution in cementitious bodies expands and creates stresses that can cause damage; therefore, reducing the number of freeze/thaw cycles experienced by a structure will extend the structure‰s service life. The incorp ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908535

27. Using Viscosity Modifiers to Reduce Effective Diffusivity in Mortars
Published: 8/1/2012
Authors: Kenneth Alan Snyder, Dale P Bentz, Jeffrey M Davis
Abstract: Three viscosity modifiers (a commercial shrinkage-reducing admixture, a polypropylene glycol, and cellulose ether) are used to reduce the effective diffusivity of chloride ions through mortars during a one-year exposure. Two delivery mechanisms ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908267

28. Incorporation of Phase Change Materials in Cementitious Systems via Fine Lightweight Aggregate
Published: 6/1/2012
Authors: Aaron Richard Sakulich, Dale P Bentz
Abstract: As infrastructure nears the end of its service life, society is facing an unprecedented maintenance crisis. A new technique that may be able to help address this crisis, extending the service life of bridge decks by reducing freeze/thaw damage th ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910167

29. Modeling Cement Hydration Kinetics Using the Equivalent Age Concept
Published: 3/29/2012
Authors: Xueyu Pang, Dale P Bentz, Christian Meyer
Abstract: In this study the hydration kinetics of four different types of cements during early ages were investigated by both chemical shrinkage and isothermal calorimetry tests. Chemical shrinkage tests were performed at both different temperatures and pressu ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910050

30. Influence of Particle Size Distributions on Yield Stress and Viscosity of Cement-Fly Ash Pastes
Published: 2/1/2012
Authors: Dale P Bentz, Chiara F Ferraris, Michael A Galler, John Guynn, Andrew Hansen
Abstract: The rheological properties of blended cement-based materials depend strongly on mixture proportions and the characteristics of the components, such as cement and fly ash. In this study, design of experiments is used to investigate the influence of t ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906927



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