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Controlled flow-rate gas injection experiments have been performed on pre-compacted samples of KBS-3 specification Mx80 1 1Mx80 is a trade name of Volclay Ltd, a subsidiary of the American Colloid Company. The material is fine-grained sodium bentonite from Wyoming containing ca 90% montmorillonite.
A buffer consisting of blocks of compacted Na bentonite powder absorbs water by which the grains expand and exfoliate, yielding clay gels that occupy the voids between them. The expandability of the grains and thereby the bulk density and hydraulic conductivity depend on the density of the gel fillings and hence on the grain density. Since the porewater electrolytes affect the pore size distribution...
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