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1. 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

2. 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

3. Surface and Uniaxial Electrical Measurements on Layered Cementitious Composites having Cylindrical and Prismatic Geometries
Published: 7/24/2014
Authors: Robert Spragg, Scott Z Jones, Kenneth Alan Snyder, Dale P Bentz, Chiara Villani, Jason Weiss
Abstract: Electrical measurements are becoming a common method to assess the transport properties of concrete. For a saturated homogenous system, the surface resistance and the uniaxial resistance measurements provide equivalent measures of resistivity once g ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915854

4. 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

5. 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

6. 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

7. Nondestructive Testing (NDT) and Sensor Technology for Service Life Modeling of New and Existing Concrete Structures
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 7974
Published: 12/18/2013
Authors: Kenneth Alan Snyder, Li Piin Sung, Geraldine S Cheok
Abstract: Nondestructive test (NDT) methods and sensor technologies are evaluated in the context of providing input parameters to service life prediction models for reinforced concrete structures. Relevant NDT methods and sensors are identified that are based ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914232

8. 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

9. Best Practices Guide for High-Volume Fly Ash Concretes: Assuring Properties and Performance
Series: Technical Note (NIST TN)
Report Number: 1812
Published: 9/18/2013
Authors: Dale P Bentz, Chiara F Ferraris, Kenneth Alan Snyder
Abstract: A best practices guide is developed from a synthesis of recent research on high-volume fly ash (HVFA) concrete mixtures. These best practices can be applied by the concrete construction industry to achieve desired properties and ensure the (high) per ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914225

10. Viscosity Modifiers to Enhance Early Age Performance and Long Term Durability of Concrete
Published: 9/1/2013
Authors: Dale P Bentz, Kenneth Alan Snyder, Max A Peltz, K H Obla, Haejin Kim
Abstract: The service life distribution of concrete structures typically follows a ,bathtubŠ-shaped function, with a finite probability of early-age failures being followed by a life with a relative low probability of failure that ultimately increases dramatic ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909952



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