Abstract
Analysis of existing data on compression (consolidation) and on rebound (swell) characteristics of sodium montmorillonitic clays shows that the sodium montmorillonite exists in the form of clay conglomerates, and the average size of the clay conglomerate is a function of the type and purity of the clay mineral, environmental conditions, and stress history. Calcium montmorillonite clays exist in the form of crystals. At high pressures, rarified calcium montmorillonite does not aggregate, whereas nonrarified calcium montmorillonite aggregates. On rebound, the average particle size does not alter in either type of calcium montmorillonite clay. The analysis has shown clearly that the microscopic model of clay and the postulation with regard to the mechanistic response of expansive clays under pressure are satisfactory.
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