Novel Portland cement matrices incorporating a gamma -MnO2 /Ag2O hydrogen/tritium getter -structure changes and trapping performance - Université de Lille Accéder directement au contenu
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.

Dates et versions

hal-04044334 , version 1 (24-03-2023)

Identifiants

Citer

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⟩
35 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Mastodon Facebook X LinkedIn More