Effects of iron corrosion products on the degradation of bentonite structure and properties
نویسندگان
چکیده
Abstract Bentonite is a key material for engineering barriers to prevent groundwater and nuclide migration in the multi-barrier system of high-level radioactive waste (HLW) geological disposal. However, its barrier property will be degraded under action iron corrosion products steel disposal containers. In this paper, effects on degradation bentonite structure properties were investigated simulated environments HLW The results showed that Fe 2+ /Fe 3+ dissolved from powder could enter montmorillonite (Mt) interlayer substituted part Na + , which caused decrease volume spacing Mt, structural integrity Mt was destroyed. Macroscopically, water absorption swelling significantly decreased. mechanism mainly generated by entered domain compensate charge deficit.
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ژورنال
عنوان ژورنال: npj Materials degradation
سال: 2023
ISSN: ['2397-2106']
DOI: https://doi.org/10.1038/s41529-023-00380-3