Author
E. Samson
Bio: E. Samson is an academic researcher from Laval University. The author has contributed to research in topics: Durability & Porous medium. The author has an hindex of 13, co-authored 21 publications receiving 1620 citations.
Papers
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TL;DR: In this paper, the mechanisms that govern the transport of ions, moisture, and gas are described, and different chemical degradation phenomena are reviewed, such as sulfate attack from external sources and formation of ettringite and thaumasite.
562 citations
TL;DR: In this article, a more rigorous approach to analyze migration test results is presented, which is based on measuring the evolution of the electrical current passing through the sample and then analyzing the results using the extended Nernst-Planck-Poisson set of equations.
Abstract: Migration tests are now commonly used to estimate the diffusion coefficients of cement-based materials. Over the past decade, various approaches have been proposed to analyze migration test results. In many cases, the interpretation of test data is based on a series of simplifying assumptions. However, a thorough analysis of the various transport mechanisms that take place during a migration experiment suggests that some of them are probably not valid. Consequently, a more rigorous approach to analyze migration test results is presented. The test procedure is relatively simple and consists in measuring the evolution of the electrical current passing through the sample. Experimental results are then analyzed using the extended Nernst-Planck-Poisson set of equations. A simple algorithm is used to determine for each experiment the tortuosity factor that allows to best reproduce the current curve measured experimentally. The main advantage of this approach resides in the fact that the diffusion coefficients of all ionic species present in the system can be calculated using a single series of data. Typical examples of the application of this method are given. Results indicate that the diffusion coefficients calculated using this approach are independent of the applied voltage and depends only slightly on the concentration level and the chemical make-up of the upstream cell solution.
304 citations
TL;DR: In this article, a description of ionic transport in unsaturated porous materials due to gradients in the electrochemical potential and the moisture content is developed by averaging the relevant microscopic transport equations over a representative volume element.
150 citations
TL;DR: In this article, the effect of temperature on ionic transport in cementitious materials is discussed, and the necessary steps to modify a model designed to work in isothermal conditions to take temperature variations of the environment into account are described.
135 citations
TL;DR: In this article, a comprehensive investigation of deterioration processes that may affect the behavior of Portland cement systems exposed to chemically aggressive environments is presented, where well-cured cement paste discs were fully characterized and exposed to deionized water and sodium sulfate solutions.
130 citations
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TL;DR: The editors have done a masterful job of weaving together the biologic, the behavioral, and the clinical sciences into a single tapestry in which everyone from the molecular biologist to the practicing psychiatrist can find and appreciate his or her own research.
Abstract: I have developed "tennis elbow" from lugging this book around the past four weeks, but it is worth the pain, the effort, and the aspirin. It is also worth the (relatively speaking) bargain price. Including appendixes, this book contains 894 pages of text. The entire panorama of the neural sciences is surveyed and examined, and it is comprehensive in its scope, from genomes to social behaviors. The editors explicitly state that the book is designed as "an introductory text for students of biology, behavior, and medicine," but it is hard to imagine any audience, interested in any fragment of neuroscience at any level of sophistication, that would not enjoy this book. The editors have done a masterful job of weaving together the biologic, the behavioral, and the clinical sciences into a single tapestry in which everyone from the molecular biologist to the practicing psychiatrist can find and appreciate his or
7,563 citations
TL;DR: Sulfate attack is defined as deleterious action involving sulfate ions; if the reaction is physical, then, it is physical sulfate attack that takes place as discussed by the authors.
609 citations
TL;DR: In this article, the authors reviewed the chloride binding of cement-based materials subjected to external chloride environments and proposed four different types of binding isotherms to describe the relationship between free and bound chloride.
588 citations
TL;DR: The use of supplementary cementitious materials (SCMs) to replace part of the clinker in cement is the most successful strategy to reduce CO2 emissions in the global cement industry.
569 citations
TL;DR: In this paper, the mechanisms that govern the transport of ions, moisture, and gas are described, and different chemical degradation phenomena are reviewed, such as sulfate attack from external sources and formation of ettringite and thaumasite.
562 citations