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You searched on: Author: Dale Bentz

Displaying records 1 to 10 of 205 records.
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1. Minimizing Paste Content in Concrete Using Limestone Powders ‹ Demonstration Mixtures
Series: Technical Note (NIST TN)
Report Number: 1906
Published: 1/14/2016
Authors: Dale P Bentz, Scott Z Jones, Didier Lootens
Abstract: In recent years, there has been great interest in reducing the cement content of concrete, due to the high energy and carbon dioxide footprints of cement production. There are numerous (waste) materials that can be substituted for cement in the c ...

2. Comparative study of methods to measure the density of Cementious powders
Published: 12/14/2015
Authors: Michelle Annette Helsel, Chiara F Ferraris, Dale P Bentz
Abstract: The accurate measurement of the density of hydraulic cement plays an essential role in the determination of concrete mixture proportions. As more supplementary cementitious materials (SCM), such as fly ash and slag, or cement replacement materials, ...

3. Effect of a micro-copolymer addition on the thermal conductivity of fly ash mortars
Published: 11/5/2015
Authors: Alejandro Duran-Herrera, Joana Ketterine Campos-Dimas, P Valdez, Dale P Bentz
Abstract: In this study, a copolymer composed of hollow spherical particles with an average particle size of 90 µm was evaluated as a lightweight aggregate in Portland cement-fly ash mortars to improve the thermal conductivity (k) of the composite. Mortars wer ...

4. Mitigation of autogenous shrinkage in repair mortars via internal curing
Published: 10/22/2015
Authors: Dale P Bentz, Scott Z Jones, Max A Peltz, Paul E Stutzman
Abstract: Repair mortars are being used with increasing frequency to maintain the aging US infrastructure. Durability is a key concern for such repair materials and both their volume stability and bond to the existing concrete are key attributes, the forme ...

5. Numerical Simulation of Heat and Mass Transport during Hydration of Portland Cement Mortar in Semi-adiabatic and Steam Curing Conditions
Published: 10/22/2015
Authors: Emilio Hernandez-Bautista, Dale P Bentz, Sadoth Sandoval-Torres, Prisciiano Cano Barrita
Abstract: The mass and heat transport during steam curing of concrete has a bearing on both the mechanical and durability properties. Therefore, it is essential to take into account the temperature evolution and the moisture distribution to prevent premature d ...

6. Influence of Internal Curing on Properties and Performance of Cement-Based Repair Materials
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 8076
Published: 10/6/2015
Authors: Dale P Bentz, Scott Z Jones, Max A Peltz, Paul E Stutzman
Abstract: Repair materials are playing an increasingly important role in the maintenance of our nation‰s aging infrastructure. Understanding their properties and performance is critical to planning and executing appropriate repairs that will provide the re ...

7. The Influence of Calcium Chloride Deicing Salt on Phase Changes and Damage Development in Cementitious Materials
Published: 10/1/2015
Authors: Yaghoob Farnam, Sarah Dick, Andrew Wiese, Jeffrey M. Davis, Dale P Bentz, Jason Weiss
Abstract: The conventional CaCl2-H2O phase diagram is often used to describe how a calcium chloride behaves when it is used on a concrete pavement undergoing freezing and thawing damage. However, the existence of additional chemical compounds in concrete can a ...

8. Neutron Radiography Evaluation of Drying in Mortars with and without Shrinkage Reducing Admixtures
Published: 8/3/2015
Authors: Chiara Villani, Catherine Lucero, Dale P Bentz, Daniel S Hussey, David L Jacobson, Jason Weiss
Abstract: Shrinkage Reducing Admixtures (SRAs) are increasingly being used in concrete as a method to minimize shrinkage and restrained shrinkage cracking. SRAs reduce shrinkage by decreasing the surface tension of the pore solution; however, SRAs also impact ...

9. Using Neutron Radiography to Quantify Water Transport and the Degree of Saturation in Entrained Air Cement Based Mortar
Published: 8/3/2015
Authors: Catherine Lucero, Dale P Bentz, Daniel S Hussey, David L Jacobson, Jason Weiss
Abstract: Air entrainment is commonly added to concrete to help in reducing the potential for freeze thaw damage. It is hypothesized that the entrained air voids remain unsaturated or partially saturated long after the smaller pores fill with water. Small gel ...

10. Damage Development in Cementitious Materials Exposed to MgCl2 Deicing Salt
Published: 6/15/2015
Authors: Yaghoob Farnam, Andrew Wiese, Dale P Bentz, Jeffrey M. Davis, Jason Weiss
Abstract: MgCl2 is used in deicing applications due to its capability to depress freezing temperatures to a lower point than other salts like NaCl. The constituents of concrete (i.e., pores solution, calcium hydroxide, aluminate phases, and calcium silicat ...

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