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Author: nicos martys

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51. User's Guide to the NIST Virtual Cement and Concrete Testing Laboratory. Version 1.0
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 6583
Published: 11/1/2000
Authors: Jeffrey W Bullard, Chiara F Ferraris, Edward Joseph Garboczi, Nicos Martys, Paul E Stutzman
Abstract: This NISTIR serves as the user's manual for Version 1.0 of the Virtual Cement and Concrete Testing Laboratory (VCCTL). Using the VCCTL, a user may create starting microstructures of cement (gypsum, fly ash, etc.) particles in water, hydrate the micr ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860310

52. Using Impedance Spectroscopy to Assess the Viability of the Rapid Chloride Test for Determining Concrete Conductivity
Series: Journal of Research (NIST JRES)
Published: 7/1/2000
Authors: Kenneth Alan Snyder, Chiara F Ferraris, Nicos Martys, Edward Joseph Garboczi
Abstract: The suitability of using the initial current from the rapid chloride test (ASTM C 1202) to determine specimen conductivity is tested using impedance spectroscopy with a frequency spectrum of 10 Hz to 1 MHz. The specimen conductivity has an analytica ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860144

53. Simulation of Fluid Flow and Permeability in Cohesionless Soils
Published: 4/1/2000
Authors: E Masad, B Muhunthan, Nicos Martys
Abstract: This paper reports on a new laboratory methodology for the determination of the structure of pores, a method for the analysis of the data to obtain the statistics of the pore structure distribution, simulation of porous media with statistics consiste ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860250

54. Energy Conserving Discrete Equation for Non-Ideal Systems
Published: 10/20/1999
Author: Nicos Martys
Abstract: The BBGKY formalism is utilized to obtain a set of moment equations to be satisfied so as to obtain an energy conserving discrete Boltzmann equation for the case of a non-local interaction potential. A modified BGK form of the collision operator con ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860155

55. Diffusion in Partially Saturated Porous Materials
Published: 10/1/1999
Author: Nicos Martys
Abstract: The diffusive transport of ions in two classes of porous media was studied as a function of fluid saturation and wetting properties. A lattice Boltzmann method was used to model phase separation of a binary mixture, including wetting effects, in por ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860120

56. Energy Conserving Discrete Boltzmann Equation for Nonideal Systems
Published: 10/1/1999
Author: Nicos Martys
Abstract: The BBGKY formalism is utilized to obtain a set of moment equations to be satisfied by the collision operator in an energy conserving discrete Boltzmann equation for the case of a nonlocal interaction potential. A modified BGK form of the collision o ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860159

57. Pore Scale Modeling of Fluid Transport Using Lattice Boltzmann Methods
Published: 10/1/1999
Authors: Nicos Martys, John G Hagedorn, J E Devaney
Abstract: The utility of the lattice Boltzmann method for modeling fluid flow in complex geometries like porous materials is examined. After study of some simple test cases, results from large scale simulations of fluid flow through digitized Fontainbleau sand ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860210

58. Digital Images and Computer Modelling
Published: 7/1/1999
Authors: Edward Joseph Garboczi, Dale P Bentz, Nicos Martys
Abstract: This chapter describes how digital images of porous materials can be analyzed to give information about the structure and properties of the material, describes various ways 3-D digital-image-based models can be generated to help understand real mater ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860146

59. Large Scale Simulations of Single and Multi-Component Flow in Porous Media
Published: 7/1/1999
Authors: Nicos Martys, John G Hagedorn, D S. Goujon, J E Devaney
Abstract: We examine the utility of the lattice Boltzmann method for modeling fluid flow in large microstructures. First, results of permeability calculations are compared to predicted values for several idealized geometries. Large scale simulations of fluid ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860203

60. Lattice Boltzmann Simulations of Single and Multi-Component Flow in Porous Media
Published: 7/1/1999
Authors: Nicos Martys, John G Hagedorn, J E Devaney
Abstract: We examine the utility of the lattice Boltzmann method for modeling fluid flow in porous media. First the lattice Boltzmann method is validated for the case of single component flow in several idealized flow geometries. Large scale simulations of f ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860261