Porosities of and diffusivities in crystalline rock and fissure coating materials

Conference · Sun Jan 01 04:00:00 EST 1984 · Mater. Res. Soc. Symp. Proc.; (United States)

OSTI ID:6073668

Skagius, K; Neretnieks, I

The diffusion of non-sorbing species in different rock materials and fissure coating materials have been studied. The results show that the effective diffusivity of iodide in granites with fissure coating materials is of the same magnitude or higher as the effective diffusivity for iodide in granites without fissure coating material. Also the porosities of the granites with fissure coating material were higher. The effective diffusivity for iodide in rock materials without fissure coating material was determined to be from 1 x 10/sup -14/ m/sup 2//s to about 7 x 10/sup -13/ m/sup 2//s. To simulate the stress that exists in the bedrock at large depths diffusion experiments with iodide in rock materials under mechanical stress, and electrical resistivity measurements in salt-water-saturated rock cores under stress have been started. Electrical resistivity measurements is an indirect method to determine the diffusivity. Results from some initial measurements show that the effective diffusivity is reduced to about 40% of the value for unstressed samples at pressures of 230-280 bar. This is the expected stress at repository depths. 4 references, 3 figures, 1 table.

• Research Organization: Royal Inst. of Tech., Stockholm, Sweden
• OSTI ID: 6073668
• Report Number(s): CONF-831174-
• Conference Information: Journal Name: Mater. Res. Soc. Symp. Proc.; (United States) Journal Volume: 26
• Country of Publication: United States
• Language: English

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