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You searched on: Author: dale bentz

Displaying records 11 to 20 of 197 records.
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11. Activation Energies of High-Volume Fly Ash Ternary Blends: Hydration and Setting
Published: 7/17/2014
Author: Dale P Bentz
Abstract: Because ready-mixed concrete is placed under a wide variety of environmental conditions, the influence of temperature on the hydration reactions and the accompanying setting (hardening) process is of critical importance. While contractors are general ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914612

12. Anticipating the Setting Time of High-Volume Fly Ash Concretes Using Electrical Measurements: Feasibility Studies Using Pastes
Published: 7/17/2014
Authors: Dale P Bentz, Kenneth Alan Snyder, Amzaray M Ahmed
Abstract: One common concern limiting the proliferation of high-volume fly ash (HVFA) concrete mixtures is the significant delay in setting that is sometimes encountered in field concrete mixtures. While several methods to mitigate the delayed setting times of ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914999

13. Measuring Freeze and Thaw Damage in Mortars Containing Deicing Salt Using a Low Temperature Longitudinal Guarded Comparative Calorimeter and Acoustic Emission (AE-LGCC)
Published: 6/23/2014
Authors: Yaghoob Farnam, Dale P Bentz, Aaron Richard Sakulich, Daniel Robert Flynn, Jason Weiss
Abstract: Deicing salts are often applied to the surface of pavements and bridge decks in the winter to melt ice; thereby improving safety for the travelling public. In this paper, the influence of NaCl deicing salt on freezing and thawing temperatures of pore ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913946

14. Electrical Testing of Cement-Based Materials: Role of Testing Techniques, Sample Conditioning, and Accelerated Curing
Published: 4/1/2014
Authors: Robert Spragg, Yiwen Bu, Kenneth Alan Snyder, Dale P Bentz, Jason Weiss
Abstract: These projects examined the potential for using electrical testing on concrete as a potential surrogate for obtaining information on ion and fluid transport. Electrical measurements are particularly attractive for use in quality control as they are e ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914978

15. Influence of Internal Curing and Viscosity Modifiers on Resistance to Sulfate Attack
Published: 4/1/2014
Authors: Dale P Bentz, Jeffrey M. Davis, Max A Peltz, Kenneth Alan Snyder
Abstract: Sulfate attack is one of the common degradation mechanisms for concrete in severe environments. While various strategies for minimizing sulfate attack are well recognized, including using an ASTM C150 Type V cement and/or reducing water-to-cementitio ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913264

16. Accelerated and Natural Carbonation of Concretes with Internal Curing and Shrinkage/Viscosity Modifiers
Published: 1/5/2014
Authors: Alejandro Duran-Herrera, Jose Manuel Mendoza-Rangel, Edgar de los Santos Rodriguez, Francisco Vazquez, P Valdez, Dale P Bentz
Abstract: In many parts of the world, corrosion of reinforcing steel in concrete induced by carbonation of the concrete continues to be a major durability concern. This paper investigates the accelerated and natural carbonation resistance of a set of 7 concret ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914100

17. Enhancing the Performance of High Volume Fly Ash Concretes Using Fine Limestone Powder
Published: 10/29/2013
Authors: Jussara Tanesi, Dale P Bentz, Ahmad Ardani
Abstract: One of the primary approaches being explored to produce more sustainable concretes consists of replacing a significant portion of the portland cement with industrial by-products. In high volume fly ash (HVFA) concretes, for example, the nominal goal ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912432

18. Fluid Transport in High-Volume Fly Ash Mixtures with and without Internal Curing
Published: 10/7/2013
Authors: Igor de la Varga, Robert Spragg, Carmelo di Bella, Javier Castro, Dale P Bentz, Jason Weiss
Abstract: The transport of fluid and ions in concrete mixtures is central to many aspects of concrete deterioration. As a result, transport properties are frequently measured as an indication of the durability that a concrete mixture may be expected to have. T ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913751

19. Electrical Resistivity Measurements in Cementitious Systems: Observations of Factors that Influence the Measurements
Published: 10/1/2013
Authors: Robert Spragg, Chiara Villani, Kenneth Alan Snyder, Dale P Bentz, Jeffrey W Bullard, Jason Weiss
Abstract: The electrical resistivity of concrete is increasingly measured as an indicator of its fluid transport properties, for use in quality control or for service life prediction. While electrical tests have the advantage of being easy and rapid to perfo ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911960

20. Influence of Sample Curing Conditions on Internal Curing Benefits Seen in Cementitious Materials
Published: 9/27/2013
Authors: Michael Golias, Dale P Bentz, Jason Weiss
Abstract: Internal curing uses pre-wetted fine lightweight aggregate (LWA) to supply cementitious systems with water. This increases the hydration of cement and reduces the influence of self-desiccation resulting in concrete with increased compressive strength ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909748



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