Abstract
AbstractMagnesium‐saturated, 0.2‐ to 1‐µm fraction of six references smectites and two smectite‐rich soil clays were solvated with ethylene glycol vapor at 65°C under graded relative vapor pressures from 3 to 100%. Each smectite expanded over a range of relative vapor pressure. This observation implied that heterogeneity in layer charge distribution of the smectites was common in the specimens. Relatively, Wards 25 and Wards 27 were least heterogeneous, and Wards 31 and Wards 23 were most heterogeneous among the specimens. The relative expandability of smectites under solvation of ethylene glycol vapor followed the sequence of: SHe‐1>Wards 25 = Wards 27≥SWy‐1> Wards 23>Bowdoin C>LC> Wards 31. The sequence corresponded approximately with that of total layer charge of the specimens. Six of the eight smectites exhibited heterogeneity in a random interstratification manner, two exhibited heterogeneity in a zoned interstratification manner. The moisture‐ethylene glycol interaction enhanced the expansion of smectites when they were partially solvated with ethylene glycol.
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