Description

In principle, the same processes are operative in hardened, water-saturated cement paste or concrete as in clay, see FEP Bu11. Solutes can be transported in stagnant porewater by diffusion, following concentration gradients. The process leads to redistribution of dissolved porewater constituents (including radionuclides) in the porewater. The diffusion process is strongly coupled to nearly all chemical processes in the concrete, since it accounts for transport of reactants to and reaction products from the processes.

SKB Number

SKB FEP Number

BP09

Main Category

Main category for FEP

Internal process

System Component

System component to which the FEP applies

Bottom plate in deposition holes

Handling

Explanation of how the FEP is treated

Intact canister, Resaturation/ "thermal period: Neglected since advection is likely to dominate, if transport occurs at all. Intact canister, Long-term after saturation and "thermal" period: Neglected since advection is likely to dominate, if transport occurs at all.

References

Bibliographic references to obtain more information

SR-Site Buffer, backfill and closure process report, TR-10-47, Section(s) 2.7.3, 8.4.2