A Preliminary Investigation of the ISG Glass Vapor Hydration |
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Authors: | Abdesselam Abdelouas Yassine El Mendili Abdelouahed Aït Chaou Gokhan Karakurt Christoph Hartnack Jean-François Bardeau Takumi Saito Hiroyuki Matsuzaki |
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Affiliation: | 1. SUBATECH, CNRS-IN2P3, Ecole des Mines de Nantes-Université de Nantes, 4 rue Alfred Kastler, BP 20722, Nantes Cedex 03, 44307 France;2. Institut des Molécules et Matériaux du Mans, UMR CNRS 6283, LUNAM Université, Université du Maine, F-72085 Le Mans 09, France;3. Department of Nuclear Engineering and Management, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656 Japan |
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Abstract: | During the geological disposal of high-level waste, the nuclear glass is expected to be first hydrated in water vapor prior to liquid alteration. In the present work, we investigated the vapor hydration of the International simple glass (ISG) at 175°C and different relative humidities (60%, 80% and 98%). The glass hydration was investigated by nuclear reaction analysis (NRA) and Fourier transform infra-red spectroscopy. The chemical and mineralogical compositions of the alteration products were studied using scanning electron microscopy/energy dispersive X-ray spectroscopy (SEM-EDS) and μ-Raman spectroscopy, respectively. The NRA results gave water diffusion coefficients of 2.31–7.34 × 10−21 m2/s, in good agreement with the literature data on borosilicate glasses altered in aqueous media. The glass hydration increased with relative humidity percentage and the SEM-EDS analysis showed a slight enrichment in Si and loss of Na in the hydrated glass layer compared with the pristine glass. The hydration rate of the ISG glass was little higher than that of the French SON68 glass hydrated using water vapor. The corrosion products were analcime, tobermorite, and calcite, which were typical of the SON68 glass hydrated in similar conditions. |
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