Leaching of cement: Study of the surface layer

Journal Article · Thu Oct 31 23:00:00 EST 1996 · Cement and Concrete Research

DOI:https://doi.org/10.1016/S0008-8846(96)00157-3· OSTI ID:404583

Faucon, P; Le Bescop, P; Adenot, F; Bonville, P; Jacquinot, J F ^[1]; Pineau, F; Felix, B ^[2]

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1. CEA Saclay, Gif-sur-Yvette (France)
2. 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, Journal Name: Cement and Concrete Research Journal Issue: 11 Vol. 26; ISSN 0008-8846; ISSN CCNRAI
• Country of Publication: United States
• Language: English

Related Subjects

05 NUCLEAR FUELS
36 MATERIALS SCIENCE
CEMENTS
CONTAINERS
LEACHING
RADIOACTIVE WASTE DISPOSAL
RADIOACTIVE WASTE STORAGE
WATER INFLUX