Leaching of cement: Study of the surface layer
- CEA Saclay, Gif-sur-Yvette (France)
- ANDRA, Chatenay-Malabry (France)
Short-lived, and possibly long-lived, radioactive waste is, or will be, stored in concrete containers (casks, disposal structures, etc.). To predict the safety of these containers, the composition and structure of the material when degraded must be known. Leaching of cement pastes shows that the properties of the surface layer are similar whether or not the cement paste contains slag. Substantial amounts of calcium, and smaller amounts of silicon, are leached out. Iron and magnesium are not released, but their content in the surface layer increases, with respect to an internal reference. Magnesium precipitates in the form of hydrotalcite, whereas the calcium of calcium silicate hydrates (CSH) is replaced by iron and dissolves out. Hydrogarnets undergo little, or no, leaching.
- OSTI ID:
- 404583
- Journal Information:
- Cement and Concrete Research, Vol. 26, Issue 11; Other Information: PBD: Nov 1996
- Country of Publication:
- United States
- Language:
- English
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