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1. 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 ...

2. 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 ...

3. 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 ...

4. 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 ...

5. 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 ...

6. Experimental and Numerical Investigation on the Effect of Cooling/Heating Rate on the Freeze-Thaw Behavior of Mortar Containing Deicing Salt Solution
Published: 6/3/2015
Authors: Yaghoob Farnam, Hadi Shagerdi Esmaeeli, Dale P Bentz, Pablo Zavattieri, Jason Weiss
Abstract: In North America, some concrete pavements and sidewalks have shown severe damage during freezing. Research has been performed to better understand the cause of damage. A test method (called longitudinal guarded comparative calorimeter (LGCC)) has bee ...

7. Service Life Modeling of Reinforced High Volume Fly ash (HVFA) Concrete Structures Containing Cracks
Published: 5/1/2015
Authors: Scott Z Jones, Dale P Bentz, Kenneth Alan Snyder, Nicos Martys, Daniel S Hussey, David L Jacobson
Abstract: Chloride ions, resulting from the application of de-icing salts travel through the concrete matrix by diffusion in a connected pore network. Cracks in concrete facilitate chloride movement by allowing ions to bypass the concrete matrix and travel ...

8. Using Acoustic Emission Waveform Characterization to Ascertain Where Cracks Originate in Concrete
Published: 4/27/2015
Authors: Yaghoob Farnam, M R Geiker, Dale P Bentz, Jason Weiss
Abstract: Different constituents of concrete can have cracking behavior that varies in terms of the acoustic waveform that is generated. Understanding the waveform may provide insight into the source and behavior of a crack that occurs in a cementitious compos ...

9. D90: The strongest contributor to setting time in MTA and Portland Cement
Published: 4/15/2015
Authors: William Ha, Dale P Bentz, Wyatt Kahler, Laurence Walsh
Abstract: Introduction: The setting times of commercial mineral trioxide aggregate (MTA) and Portland cements vary. It was hypothesized that much of this variation was due to differences in particle size distribution. Methods: Two gram samples from 11 MTA ...

10. Design and Performance of Ternary Blend High-Volume Fly Ash Concretes of Moderate Slump
Published: 3/27/2015
Authors: Dale P Bentz, Scott Z Jones, Kenneth Alan Snyder
Abstract: One approach to increasing the sustainability of concrete construction is to replace a significant portion of the ordinary portland cement (OPC) with a supplementary cementitious material, such as fly ash. This paper presents mixture proportions and ...

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