THE PARTICLE ANALYSIS OF CLAYS BY SEDIMENTATION1

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Abstract
As a result of the analysis of Odén, it is possible to apply the sedimentation method quantitatively to the determination of particle distribution of clays in the dispersed state. An experimental procedure is described by which a number of points on the curve may be determined without the aid of any special apparatus. Sedimentation without the aid of a deflocculating agent gives valuable information as to the condition of the clay. Flocculated clays behave like jellies and the method of particle analysis cannot be applied in this case. Data concerning the usual physical properties are presented and these are found consistent with the results of the sedimentation tests as confirmed by microscope observations. The dispersed and fine grained clays are characterized by high dry strength, and the effect of deflocculating a clay is to increase its dry strength.

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