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Title: The effect of weathering on physical and chemical properties of some Mesozoic clays
Author: Russell, D. J.
ISNI:       0000 0001 3540 2075
Awarding Body: University of Reading
Current Institution: University of Reading
Date of Award: 1977
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Compositional and fabric-related properties have been determined on samples taken from weathering profiles in overconsolidated Mesozoic clays. The interrelationships between these properties as weathering proceeds and the controls on and mechanisms of clay weathering have been studied. Statistical analysis of the data has yielded a compositional weathering index. The bulk mineralogy of the clays studied is not changed by weathering and consists of illite, kaolinite and quartz. Other minerals present in unwveathered clay, notably pyrite and calcite, are affected by weathering. Gypsum is formed by the weathering of these two minerals. Montmorillonite content increases with weathering, as does illite degradation. Changes in fabric-related properties are very significant. Most importantly, moisture content increases and undrained strength drops towards the surface. Shear strength anisotropy also is sensitive to weathering. The anisotropy of other physical properties . (velocity, resistivity) also reacts to weathering, indicating the brealcdown of clay fabric using non-destructive tests..
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available