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You searched on: Author: nicos martys

Displaying records 11 to 20 of 78 records.
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11. Measurement Science Roadmap for Workability of Cementitious Materials: Workshop Summary Report
Series: Technical Note (NIST TN)
Report Number: 1704
Published: 8/15/2011
Authors: Chiara F Ferraris, Nicos Martys
Abstract: This report summarizes the results of the workshop ,Measurement Science Roadmap for Workability of Cementitious MaterialsŠ held on March 18, 2011 in Gaithersburg Maryland and sponsored by the National Institute of Standards and Technology with collab ...

12. Advancing the materials science of concrete with supercomputers
Published: 1/24/2011
Authors: Jeffrey W Bullard, Edward Joseph Garboczi, William L George, Nicos Martys, Steven G Satterfield, Judith Ellen Terrill
Abstract: Supercomputers are renowned for being used on grand challenge problems like global weather patterns, nuclear device virtual testing, galaxy formation, unraveling molecular structure ‹ and now concrete! Why do the mysteries of concrete form this kind ...

13. A Smoothed Particle Hydrodynamics Based Fluid Model with a Spatially Dependent Viscosity: Application to flow of a suspension with a non-Newtonian fluid matrix
Published: 10/1/2010
Authors: Nicos Martys, William L George, Byong-Wa Chun, Didier Lootens

14. A Numerical Study of the Flow of Bingham-Like Fluids In Two Dimensional Vane And Cylinder Rheometers Using a Smoothed Particle Hydrodynamic (SPH) Based Method
Published: 4/7/2010
Authors: Huaning Zhu, Nicos Martys, Chiara F Ferraris, Daniel De Kee
Abstract: A vane rheometer is commonly used to determine the rheological properties of suspensions, colloids such as cement-based materials, many of which can be described as a Bingham fluid. Due to the complex flow geometry of the vane rheometer, relating mea ...

15. Virtual Testing of Concrete Transport Properties
Published: 10/1/2009
Authors: Dale P Bentz, Edward Joseph Garboczi, Nicos Martys, Kenneth Alan Snyder, W. S. Guthrie, Konstantinos Kyritsis, Narayanan Neithalath
Abstract: The transport properties of concrete are critical to its field performance. Commonly encountered degradation mechanisms are dependent on ionic diffusivity, sorptivity, and permeability. In this paper, virtual testing of two of these concrete transp ...

16. Contact and Stress Anisotropies in Start Up Flows of Collodial Suspensions
Published: 9/11/2009
Authors: Nicos Martys, William L George, Didier Lootens, Pascal Hebraud
Abstract: Spatio-temporal correlations in start-up flows of attractive colloids are explored by numerical simulations. The suspension is first allowed to flocculate during a time tw, then the stress necessary to induce its flow is computed. Whereas at low vol ...

17. Building Plumbing System Decontamination - First Report on Recommendations
Series: Technical Note (NIST TN)
Report Number: 1652
Published: 9/6/2009
Authors: Stephen J. Treado, Mark A Kedzierski, Stephanie S Watson, Nicos Martys, Kenneth D Cole
Abstract: This report summarizes the measurement results and recommended procedures for responding to building plumbing system contamination incidents and restoring the water system to safe operation. The recommendations are based on analysis of the results o ...

18. Virtual Cement and Concrete
Published: 9/1/2009
Authors: Jeffrey W Bullard, Chiara F Ferraris, Edward Joseph Garboczi, Nicos Martys, Paul E Stutzman, Judith Ellen Terrill
Abstract: Design and optimization of cement or concrete mixes typically is accomplished by intensive trial-and-error experimentation, primarily because the design space has many parameters and because interactions between these parameters are incompletely unde ...

19. Extending Measurement Science to Interactive Visualization Environments
Published: 1/30/2009
Authors: Judith Ellen Terrill, William L George, Terence J. Griffin, John G Hagedorn, John T. Kelso, Thomas M Olano, Adele P Peskin, Steven G Satterfield, James S Sims, Jeffrey W Bullard, Joy P Dunkers, Nicos Martys, Agnes (Abbie) O'Gallagher, Gillian Haemer
Abstract: We describe a method for creating a visual laboratory to interactively measure and analyze scientific data. We move the normal activities that scientists perform to understand their data into the visualization environment. The visualization environme ...

20. Standards Development for Gas Phase Air Cleaning Equipment in Buildings
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 7525
Published: 11/3/2008
Authors: Andrew Keith Persily, Cynthia H. Reed, Stephanie S Watson, Nicos Martys, Edward Joseph Garboczi, Heather Davis
Abstract: Concerns about building security have resulted in increasing interest in gas phase air cleaning (GPAC) and the need for standard methods to determine the effectiveness of these systems. Similarly, the ability to predict their installed performance, ...

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