| People | Locations | Statistics |
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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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Claret, Francis
Bureau de Recherches Géologiques et Minières
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (16/16 displayed)
- 2024Water dynamics in calcium silicate hydrates probed by inelastic neutron scattering and molecular dynamics simulationscitations
- 2023How much water is there within calcium silicate hydrates? Probing water dynamics by Inelastic Neutron Scattering and Molecular Dynamics Simulations
- 2022Modelling of the long-term evolution and performance of engineered barrier systemcitations
- 2022MODELLING OF THE LONG TERM EVOLUTION AND PERFORMANCE OF ENGINEERED BARRIER SYSTEM
- 2020Contribution of the results of the CEBAMA project to decrease uncertainties in the Safety Case and Performance Assessment of radioactive waste repositoriescitations
- 2017Evidence of (Ca, Mg) smectite formation at Clay/cement interfaces
- 2017In situ interactions between Opalinus Clay and Low Alkali Concretecitations
- 2017In-situ determination of the kinetics and mechanisms of nickel adsorption by nanocrystalline vernaditecitations
- 2017Modelling of the COx/glass interactions: case of the long term MVE experiment
- 2017Minerals paragenesis in hydrated cement paste seen by diffraction tomography
- 2015Structural defects in layered structures: Their determination and their impact on reactivity
- 2014Effects of charging on the chromophores of dissolved organic matter from the Rio Negro basincitations
- 2014Constraints from sulfur isotopes on the origin of gypsum at concrete/claystone interfacescitations
- 2013X-ray diffraction: a powerful tool to probe and understand the structure of nanocrystalline calcium silicate hydratescitations
- 2013On the nature of structural disorder in calcium silicate hydrates with a calcium/silicon ratio similar to tobermoritecitations
- 2012Heterogeneous formation of ferric oxide nanoparticles on chlorite surfaces studied by x-ray absorption spectromicroscopy (STXM)citations
Places of action
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conferencepaper
Minerals paragenesis in hydrated cement paste seen by diffraction tomography
Abstract
Large amounts of nuclear waste await final disposal worldwide. A combination of waste overpacks (e.g. metal canisters, concrete), engineered barriers such as bentonite, and natural barriers such as clay rocks, constitutes the elements of the so-called " multiple-barrier system " between the waste matrix and the biosphere. The number, types and assigned safety functions of these various barriers depend on the chosen repository concept, the waste form, the radionuclide inventory in the waste, the selected host rock, the hydrogeological and geochemical settings of the repository site, etc.(Apted and Ahn, 2010). These barrier properties will evolve with time in response to the physical and chemical interactions between the various constituents of the barriers and the surrounding environment. Consequently, predicting how these properties evolve is of prime importance for performance and safety evaluations of the repository concepts. As a prerequisite, initial properties of the materials used in the disposal have to be understood, to better predict their long term behavior. Although micro imaging techniques are more and more sophisticated and powerful (Gaboreau et al., 2016), few techniques allow in-situ characterization of both the evolution of the different phases's mineralogy and their 3D spatial arrangement. To tackle this issue, X-Ray diffraction computed tomography (XRD-CT, see Fig1) that allows to record in each voxel of the recorded volume an X-ray diffraction pattern, has been successfully applied to investigate hydration and microstructural development in cements (Voltolini et al., 2013). Here we present results obtained by synchrotron XRD-CT on a cement paste formulation, which is constituted of blended Portland, fly ash, blast furnace slag cement (Chen et al., 2012), foreseen to be used for nuclear waste disposal application. The mineralogy (including spatial distribution) of a cured cement paste and of a cement paste undergoing in-situ and time-resolved hydration will be compared and discussed. In addition, special care will be taken to analyze the evolution of cement porosity as a function of time and of associated spatially-and time-resolved carbonation mechanism.