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NUMERICAL REPRESENTATIVE ELEMENTARY VOLUME GENERATION OF A SIMPLIFIED CEMENT PASTE AND ESTIMATION OF ITS DIFFUSIVITY AND COMPARISON WITH DEDICATED EXPERIMENTS

卷 20, 册 1, 2017, pp. 29-46
DOI: 10.1615/JPorMedia.v20.i1.30
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摘要

Cementitious materials are widely used in the concepts of radioactive waste disposal facilities. During the lifetime of these disposals, those materials will undergo physicochemical degradations. To assess their impacts, reactive transport modelling is used. Reactive transport codes modify the transport properties based on the modelled porosity evolution by using Archie's law as a feedback between porosity and diffusive properties. These laws are not suited to cementitious materials, whose pore structure is complex and expands over a wide range of pore sizes. The ultimate goal of this research is about developing a microstructure-based feedback relation for the diffusive properties of complex porous structures such as cementitious ones. Therefore, we developed an algorithm designed to generate numerical microstructures representative of simplified cement pastes and performed an experimental campaign consisting of dedicated experiments. A random-walk algorithm is used to compute the effective diffusion coefficients of our numerical microstructures. This paper investigates the description of the initial numerical microstructure and how transport properties are sensitive to different microstructural features that can be controlled from the designed algorithm. Simulations both on the experimental microtomograph and the generated microstructures allow to show that our models are complete to describe the microstructure and diffusion transport property of simplified cementitious materials. Sensitivity analysis is also provided, whose results show that a simple feedback relation cannot properly describe these transport properties. This gives confidence in our approach and its future extension toward the description of cementitious material degradations.

对本文的引用
  1. Boukobza E., Bar-Nes G., Ben-David O. Klein, Carmeli B., Modeling of strontium leaching from carbonated Portland cement pastes using a simplified diffusion-kinetic analytical model, Applied Geochemistry, 100, 2019. Crossref

  2. Lemmens Laurent, Rogiers Bart, Jacques Diederik, Huysmans Marijke, Swennen Rudy, Urai Janos L., Desbois Guillaume, Laloy Eric, Nested multiresolution hierarchical simulated annealing algorithm for porous media reconstruction, Physical Review E, 100, 5, 2019. Crossref

  3. Seigneur N., Kangni-Foli E., Lagneau V., Dauzères A., Poyet S., Bescop P. Le, L’Hôpital E., d’Espinose de Lacaillerie J.-B., Predicting the atmospheric carbonation of cementitious materials using fully coupled two-phase reactive transport modelling, Cement and Concrete Research, 130, 2020. Crossref

  4. Lalan Philippines, Dauzères Alexandre, De Windt Laurent, Sammaljärvi Juuso, Bartier Danièle, Techer Isabelle, Detilleux Valéry, Siitari-Kauppi Marja, Mineralogical and microstructural evolution of Portland cement paste/argillite interfaces at 70 °C – Considerations for diffusion and porosity properties, Cement and Concrete Research, 115, 2019. Crossref

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