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Soil Science Society of America Journal Abstract -

Correlation of Soil Plasticity with Amorphous Clay Constituents1


This article in SSSAJ

  1. Vol. 43 No. 3, p. 613-616
    Received: Nov 3, 1978
    Accepted: Feb 15, 1979

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  1. D. H. McNabb2



The percentage of amorphous constituents removed from the clay size fraction of western Oregon soils by kinetic dissolution was significantly correlated with soil plasticity. Soil plasticity was identified by the plasticity angle which was defined by the angle, relative to the ‘A’ line intercept, where the Atterberg limits of air-dried soil occurred on the Casagrande plasticity chart. An exponential correlation between the plasticity angle and the sum of the amorphous Al2O3 and SiO2 was more significant than between the plasticity angle and the sum of the amorphous Al2O3, SiO2, and Fe2O3 (r2 = 0.88** and 0.76**, respectively).

The Atterberg limits of the soil were not directly correlated with the percentage of amorphous constituents.

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