Novel Portland cement matrices incorporating a gamma -MnO2 /Ag2O hydrogen/tritium getter -structure changes and trapping performance - Université de Lille
Article Dans Une Revue Journal of Nuclear Materials Année : 2022

Novel Portland cement matrices incorporating a gamma -MnO2 /Ag2O hydrogen/tritium getter -structure changes and trapping performance

Résumé

This study investigates novel Portland cement-based mortars, developed for hydrogen/tritium trapping and radioactive waste immobilization. They incorporate a γ-MnO2/Ag2O getter powder at 10% wt (i.e. 6.8 to 7.1% vol). Compared to former patented materials, no drying or heat treatment of the materials is needed.Complementarily to X Ray Diffractometry (XRD) and thermo-gravimetry analysis (TGA), 27Al and 29Si Magic Angle Spinning Nuclear Magnetic Resonance (MAS NMR) evidences that the structure of the Portland cement solids (i.e. the C-A-S-H) is not impacted by the presence of getter, even after several month curing. Yet, Scanning Electron Microscopy coupled to Energy Dispersive Spectroscopy (SEM+EDS) shows that calcium is significantly present at the surface of the getter grains; this could affect trapping efficiency.However, after gamma irradiation with cumulated doses of 491 or 997 kGy (i.e. 23 to 46 days at 900 Gy.h−1), all mortars made with getter have a hydrogen trapping efficiency of between 77 and 96%, when compared to the irradiation of mortars made with a non-trapping γ-MnO2 powder, or to the irradiation of pure water considered alone.This means that the developed mortars display excellent hydrogen trapping efficiency, without any impact on their solid structure.
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hal-04044334 , version 1 (22-07-2024)

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Sandy Lanier, Catherine Davy, Cyrille Albert-Mercier, Oriane Farcy, Céline Cau-Dit-Coumes, et al.. Novel Portland cement matrices incorporating a gamma -MnO2 /Ag2O hydrogen/tritium getter -structure changes and trapping performance. Journal of Nuclear Materials, 2022, Journal of Nuclear Materials, 567, pp.153819. ⟨10.1016/j.jnucmat.2022.153819⟩. ⟨hal-04044334⟩
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