Compaction of Weathered Clays near Sarnia, Ontario

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Abstract
Oxidation weathering has produced up to 15% swelling clay from originally inactive soil chlorites in the upper 2 m of crustal soils at Sarnia, Ontario. Carbonates have been leached from the upper 1.5 m and deposited at depth.Surface soils containing the montmorillonite compact less efficiently than deeper soils, yielding modified A.A.S.H.O. densities up to 6 p.c.f. less than for deeper soils, provided the samples are not dried prior to compaction. Air drying produces clay mineral collapse and more efficient laboratory compaction, thus hiding the true compaction behavior of the surface soils.

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