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Author: dale bentz

Displaying records 11 to 20 of 160 records.
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11. 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

12. 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

13. 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

14. 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

15. 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

16. Internal Curing - Constructing More Robust Concrete
Published: 1/19/2012
Authors: Jason Weiss, Dale P Bentz, Anton Schlinder, Pietro Lura
Abstract: It is often said that there are two types of concrete: concrete that has cracked and concrete that is going to crack. Unfortunately, this is true all too frequently. Many of these unwanted cracks develop shortly after the concrete is placed and in ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910059

17. Analysis of Early-Age Bridge Deck Cracking in Nevada and Wyoming
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 7841
Published: 1/17/2012
Authors: Dale P Bentz, Paul E Stutzman, Aaron Richard Sakulich, William Jason Weiss
Abstract: In late 2009, the Echo Wash and Valley of Fire bridge decks were constructed in the Lake Mead National Recreation area in Nevada. Within six months, in early 2010, both decks exhibited considerable transverse cracking, with some cracks extendin ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910303

18. Fine Limestone Additions to Regulate Setting in High Volume Fly Ash Mixtures
Published: 1/2/2012
Authors: Dale P Bentz, Taijiro Sato, Igor de la Varga, Jason Weiss
Abstract: High volume fly ash (HVFA) concrete mixtures are being considered more frequently due to their cost and sustainability advantages. While the long term performance of these HVFA concretes typically meets or exceeds that of conventional concretes, the ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908529

19. Thermal Properties and Thermal Modeling of Ballistic Clay Box
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 7840
Published: 12/30/2011
Authors: Dale P Bentz, Amanda Lattam Forster, Kirk D Rice, Michael A Riley
Abstract: A critical component of hard and soft body armor testing is the utilization of a clay block behind the component being evaluated. One of the performance metrics used to evaluate products is the penetration depth into the clay of an indentation ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910244

20. Comparison of ASTM C311 Strength Activity Index Testing vs. Testing Based on Constant Volumetric Proportions
Published: 9/12/2011
Authors: Dale P Bentz, Alejandro Duran-Herrera, Daniel Galvez-Moreno
Abstract: Currently, the (pozzolanic) strength activity indices of fly ashes and natural pozzolans are typically evaluated using the procedures outlined in ASTM C311, “Standard Test Methods for Sampling and Testing Fly Ash or Natural Pozzolans for Use in Portl ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908667