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Search Publications by: Kenneth A. Snyder (Fed)

Displaying 26 - 50 of 148

Surface and Uniaxial Electrical Measurements on Layered Cementitious Composites having Cylindrical and Prismatic Geometries

July 24, 2014

Author(s)

Robert Spragg, Scott Jones, Kenneth A. Snyder, Dale P. Bentz, Chiara Villani, Jason Weiss

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 geometry

Anticipating the Setting Time of High-Volume Fly Ash Concretes Using Electrical Measurements: Feasibility Studies Using Pastes

July 17, 2014

Author(s)

Dale P. Bentz, Kenneth A. Snyder, Amzaray M. Ahmed

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 HVFA

Electrical Testing of Cement-Based Materials: Role of Testing Techniques, Sample Conditioning, and Accelerated Curing

April 1, 2014

Author(s)

Robert Spragg, Yiwen Bu, Kenneth A. Snyder, Dale P. Bentz, Jason Weiss

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 easy to

Influence of Internal Curing and Viscosity Modifiers on Resistance to Sulfate Attack

April 1, 2014

Author(s)

Dale P. Bentz, Jeffrey M. Davis, Max A. Peltz, Kenneth A. Snyder

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-cementitious

Nondestructive Testing (NDT) and Sensor Technology for Service Life Modeling of New and Existing Concrete Structures

December 18, 2013

Author(s)

Kenneth A. Snyder, Li Piin Sung, Geraldine S. Cheok

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 on

Electrical Resistivity Measurements in Cementitious Systems: Observations of Factors that Influence the Measurements

October 1, 2013

Author(s)

Robert Spragg, Chiara Villani, Kenneth A. Snyder, Dale P. Bentz, Jeffrey W. Bullard, Jason Weiss

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 perform

Best Practices Guide for High-Volume Fly Ash Concretes: Assuring Properties and Performance

September 18, 2013

Author(s)

Dale P. Bentz, Chiara F. Ferraris, Kenneth A. Snyder

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)

Viscosity Modifiers to Enhance Early Age Performance and Long Term Durability of Concrete

September 1, 2013

Author(s)

Dale P. Bentz, Kenneth A. Snyder, Max A. Peltz, K H. Obla, Haejin Kim

The service life distribution of concrete structures typically follows a bathtub-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 dramatically

Using a Saturation Function to Interpret the Electrical Properties of Partially Saturated Concrete

August 29, 2013

Author(s)

William J. Weiss, Kenneth A. Snyder, Jeffrey W. Bullard, Dale P. Bentz

Electrical properties are frequently measured in the concrete construction industry as a part of mixture qualification and quality control testing. While there are several factors that influence the electrical response of concrete, one of the most

Sensors and Monitoring to Assess Grout and Vault Behavior for Performance Assessments

August 12, 2013

Author(s)

Kenneth A. Snyder, Jason Weiss

To support performance assessment (PA) of waste vaults and grout monoliths, the National Institute of Standards and Technology (NIST) has performed a preliminary evaluation of the state-of-the-art of sensors, nondestructive evaluation methods, and any

Hydrated Phases in Blended Cement Systems and Synthetic Saltstone Grouts

June 10, 2013

Author(s)

Kenneth A. Snyder, Paul E. Stutzman

A blended binder system (10 % portland cement, 45 % fly ash, and 45 % slag) is characterized as part of a broader study of its long-term effectiveness in stabilizing treated salt waste at the Savannah River Site. The binder system is reproduced in the

Alkali-Silica Reaction Degradation of Nuclear Power Plant Concrete Structures: A Scoping Study

March 11, 2013

Author(s)

Kenneth A. Snyder, Hai S. Lew

Alkali-silica reaction (ASR) is a concrete degradation phenomenon in which the alkalis that are typically found in concrete react with certain amorphous or micro-crystalline siliceous phases in the aggregate and, in the presence of moisture, form an

Hydrated phases and pore solution composition in cement-solidified saltstone waste forms

March 8, 2013

Author(s)

Kenneth A. Snyder, Paul E. Stutzman, Jacob Philip, David W. Esh

The mineral phases and pore solution composition of hydrated cement-solidified saltstone waste forms are quantified using thermogravimetric analysis, quantitative X-ray diffraction, and inductively-coupled plasma. The results suggest that, after 6 months