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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Smith, David
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (20/20 displayed)
- 2022Seroprevalence of Severe Acute Respiratory Syndrome Coronavirus 2-Specific Antibodies in Australia After the First Epidemic Wave in 2020: A National Surveycitations
- 2022Neck formation and role of particle-particle contact area in the thermal conductivity of green and partially sintered alumina ceramicscitations
- 2020Comparison of measured and modelled residual stresses in a welded P91 steel pipe undergoing post weld heat treatmentcitations
- 2018Measurement of the residual stresses in a PWR Control Rod Drive Mechanism nozzlecitations
- 2017Three-dimensional mapping of the residual stress field in a locally rolled aluminium alloy specimencitations
- 2016Design and Simulation of a Frequency-Diverse Aperture for Imaging of Human-Scale Targetscitations
- 2016Design and Simulation of a Frequency-Diverse Aperture for Imaging of Human-Scale Targetscitations
- 2016Effect of humidity on the dielectric constant and electrical impedance of mesoporous zirconia ceramicscitations
- 2016Relaxation of residual stresses when extracting a specimen from a dissimilar metal electron beam welded plate
- 2016Relaxation of residual stresses when extracting a specimen from a dissimilar metal electron beam welded plate
- 2015Absence of MERS-CoV antibodies in feral camels in Australia: Implications for the pathogen's origin and spread
- 2015Advances in the deep hole drilling technique for the residual stress measurement in composite laminates
- 2015Advances in the deep hole drilling technique for the residual stress measurement in composite laminates
- 2015Measurement of in-plane residual stresses in an AS4/8552 composite laminate using the deep-hole drilling method
- 2015Measurement of in-plane residual stresses in an AS4/8552 composite laminate using the deep-hole drilling method
- 2014Understanding the Impact of High-Magnitude Repair-Weld Residual Stresses on Ductile Crack Initiation and Growth: The STYLE Mock-Up 2 Large Scale Testcitations
- 2013Metamaterial Apertures for Computational Imagingcitations
- 2007Comparative study of methods used to estimate ionic diffusion coefficients using migration testscitations
- 2002Growth of Fe/Ge(001) heterostructures by molecular beam epitaxycitations
- 2002Growth of Fe/Ge(001) heterostructures by molecular beam epitaxy:Interface structure, electronic and magnetic propertiescitations
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article
Comparative study of methods used to estimate ionic diffusion coefficients using migration tests
Abstract
Ionic diffusion coefficients are estimated rapidly using electromigration tests. In this paper, electromigration tests are accurately simulated by numerically solving the Nernst–Planck (NP) equation (coupled with the electroneutrality condition (EN)) using the finite element method. Numerical simulations are validated against experimental data obtained elsewhere [E. Samson, J. Marchand, K.A. Snyder, Calculation of ionic diffusion coefficients on the basis of migration test results, Materials and Structures/Matériaux et Constructions 36 (257) (2003) 156–165., H. Friedmann, O. Amiri, A. Aït-Mokhtar, A direct method for determining chloride diffusion coefficient by using migration test, Cement and Concrete Research 34 (11) (2004) 1967–1973.]. It is shown that migration due to the non-linear electric potential completely overwhelms diffusion due to concentration gradients. The effects of different applied voltage differences and chloride source concentrations on estimations of chloride diffusion coefficients are explored. We show that the pore fluid within concrete and mortar specimens generally differs from the curing solution, lowering the apparent diffusion coefficient, primarily due to interactions of chloride ions with other ions in the pore fluid. We show that the variation of source chloride concentration strongly affects the estimation of diffusion coefficients in non-steady-state tests; however this effect vanishes under steady-state conditions. Most importantly, a comparison of diffusion coefficients obtained from sophisticated analyses (i.e., NP–EN) and a variety of commonly used simplifying methods to estimate chloride diffusion coefficients allows us to identify those methods and experimental conditions where both approaches deliver good estimates for chloride diffusion coefficients. Finally, we demonstrate why simultaneous use and monitoring of current density and fluxes are recommended for both the non-steady and steady-state migration tests.