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Author: dale bentz

Displaying records 21 to 30 of 185 records.
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21. Quantifying Residual Stress Development and Reserve Strength in Restrained Internally Cured Concrete
Published: 1/1/2013
Authors: John Schlitter, Dale P Bentz, Jason Weiss
Abstract: 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907144

22. 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

23. 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

24. 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

25. 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

26. 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

27. 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

28. 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

29. 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

30. 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



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