The effect of pore structural factors on diffusion in compacted sodium bentonite

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Citations (Scopus)

Abstract

Four kinds of diffusion experiments; (1) through-diffusion (T-D) experiments for diffusion direction dependency to compacted direction, (2) in-diffusion (I-D) experiments for composition dependency of silica sand in bentonite, (3) I-D experiments for initial bentonite grain size dependency, and (4) I-D experiments for the effect of a single fracture developed in bentonite, were carried out using tritiated water (HTO) to evaluate the effect of pore structural factors on diffusion. For (1), effective diffusivities (De) in Na-bentonites, Kunigel-V1® and Kunipia-F®, were measured for densities of 1.0 and 1.5 Mg·m-3 in the axial and perpendicular directions to compacted one. Although De values in Kunigel-V1® for both directions were similar over the density, De values for perpendicular direction to compacted one in Kunipia-F® were higher than those for the same direction as compacted one. For (2), apparent diffusivities (Da) in Kunigel-V1® with silica sand were measured for densities of 0.8 to 1.8 Mg·m-3. No significant effect of the mixture of silica sand was found. For (3), Da values for densities of 0.8 to 1.8 Mg·m-3 were measured for a granulated Na-bentonite, OT-9607®. However, no effect of initial bentonite grain size was found. For (4), Da values in Kunigel-V1®, in which a single fracture was artificially reproduced and immersed in distilled water, were measured. No effect of the fracture on Da was found. Based on this, it may be said that the composition of smectite in bentonite affects the orientation property of clay particle and also affects diffusion. Furthermore, a penetrated fracture formed in bentonite is restored for a short while and does not affect diffusion.

Original languageEnglish
Title of host publicationMaterials Research Society Symposium - Proceedings
EditorsK.P. Hart, G.R. Lumpkin
Pages605-615
Number of pages11
Volume663
Publication statusPublished - 2001
Externally publishedYes
EventScientific Basis for Nuclear Waste Management XXIV - Sydney, Australia
Duration: Aug 27 2000Aug 31 2000

Other

OtherScientific Basis for Nuclear Waste Management XXIV
CountryAustralia
CitySydney
Period8/27/008/31/00

Fingerprint

Bentonite
Sodium
Silica sand
Experiments
Water
Chemical analysis
Direction compound

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

Cite this

Sato, H. (2001). The effect of pore structural factors on diffusion in compacted sodium bentonite. In K. P. Hart, & G. R. Lumpkin (Eds.), Materials Research Society Symposium - Proceedings (Vol. 663, pp. 605-615)

The effect of pore structural factors on diffusion in compacted sodium bentonite. / Sato, Haruo.

Materials Research Society Symposium - Proceedings. ed. / K.P. Hart; G.R. Lumpkin. Vol. 663 2001. p. 605-615.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Sato, H 2001, The effect of pore structural factors on diffusion in compacted sodium bentonite. in KP Hart & GR Lumpkin (eds), Materials Research Society Symposium - Proceedings. vol. 663, pp. 605-615, Scientific Basis for Nuclear Waste Management XXIV, Sydney, Australia, 8/27/00.
Sato H. The effect of pore structural factors on diffusion in compacted sodium bentonite. In Hart KP, Lumpkin GR, editors, Materials Research Society Symposium - Proceedings. Vol. 663. 2001. p. 605-615
Sato, Haruo. / The effect of pore structural factors on diffusion in compacted sodium bentonite. Materials Research Society Symposium - Proceedings. editor / K.P. Hart ; G.R. Lumpkin. Vol. 663 2001. pp. 605-615
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