Abstract— It is found experimentally, that while building-up of pressure applied to natural clay, observed is general tendency of clay fraction content decrease and pulverescent fraction content increase. In montmorillonite natural clay, granulometric changes progress more intensively, than in kaolinite one. Within the pressure range of 0 – 125МPа processes of change of natural clay fractional compositions progress more intensively, than at higher pressures. Under pressures within the ranges of 125-750МPа and 800-2200МPа revealed is different intensity of natural clay fractional compositions formation. Based on pressure index, three classes are defined; each is featuring different intensity of aggregation and dispersion processes progressing. While compression of natural clay defects are formed on crystallite surfaces, increasing energy potential of crude ground. Additional energy enables formation of molecular attractive forces, which cause particles aggregation.
Keywords— Clay, Pressure, Granulometric Analysis, Fraction, Kaolin, Montmorillonite.
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