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1. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=917766

2. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=917186

3. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=918015

4. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=918183

5. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=916149

6. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=917167

7. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=917801

8. Simulation Studies of Methods to Delay Corrosion and Increase Service Life for Cracked Concrete Exposed to Chlorides
Published: 2/18/2015
Authors: Scott Z Jones, Nicos Martys, Yang Lu, Dale P Bentz
Abstract: The ingress of chlorides in reinforced concrete leads to the onset of rebar corrosion and eventually compromises a structure‰s integrity. To extend its service life and improve safety, it is crucial to develop sound repair and rehabilitation stra ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915420

9. Multi-Scale Investigation of the Performance of Limestone in Concrete
Published: 12/1/2014
Authors: Dale P Bentz, Ahmad Ardani, Tim Barrett, Scott Z Jones, Didier Lootens, Max A Peltz, Taijiro Sato, Paul E Stutzman, Jussara Tanesi, Jason Weiss
Abstract: Limestone (calcium carbonate) has long been a critical component of concrete, whether as the primary raw material for cement production, a fine powder added to the binder component, or a source of fine and/or coarse aggregate. This paper focuses on t ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=916188

10. Acoustic Emission and Low Temperature Calorimetry Study of Freeze and Thaw Behavior in Cementitious Materials Exposed to NaCl Salt
Published: 11/3/2014
Authors: Yaghoob Farnam, Dale P Bentz, Allison Hampton, Jason Weiss
Abstract: This paper describes a series of experiments that were performed to assess the freeze-thaw behavior of mortar samples exposed to NaCl solutions. A low-temperature longitudinal guarded comparative calorimeter was used to perform cyclic freeze-thaw te ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914444



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