The impact of cement on argillaceous rocks in radioactive waste disposal systems: a review focusing on key processes and remaining issues
作者： Yukio Tachi , James Wilson , Keith Bateman
DOI: 10.1016/J.APGEOCHEM.2021.104979
关键词:
摘要: Abstract Several repository concepts have been proposed for the disposal of radioactive wastes, some which include argillaceous (clay-rich) host rocks and cementitious engineered barriers. The presence hyperalkaline cement pore-fluid results in destabilization primary minerals rocks, leading to alteration at interface between cement/concrete rock. This phenomenon has implications radionuclide transport safety assessment. Data on cement-mudrock interactions from experimental, analogue, modelling studies reviewed, remaining areas uncertainty identified. Although a reasonably good understanding key processes acquired, there are remains, particular: system evolution temperatures above 25˚C; kinetics secondary mineral growth; extent pore-clogging due formation; degree predicted porosity reduction could impede contaminant migration; effect rock sorption. A multi-disciplinary programme work is likely be most productive elucidate further how they operate over different spatial temporal scales. ongoing acquisition geochemical data model construction, testing models against analogue laboratory data, should reduce uncertainties associated with predicting evolution, thereby aiding case development.
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