Abstract
Mineral analysis of a moderately sensitive ($˜20) Leda/Champlain clay from Gloucester, Ottawa, indicates a clay mineral (illite and chlorite) content of$˜13%, and a carbonate mineral (calcite and dolomite) content of 1–2%. The carbonate minerals appear to be concentrated in the 2-μm fractions. The main constituents are primary minerals (quartz and feldspars) and an amorphous material. Comparison with the extremely sensitive (200) St. Jean Vianney clay shows that the only significant difference is in the clay-mineral content. The amorphous and carbonate materials, which are probably active cementing agents contributing to the undisturbed strength, are present in similar quantities in both samples. The higher clay-mineral content in the Gloucester clay appears to be the critical factor, reducing the sensitivity by creating a higher remoulded strength.
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