Abstract
Recent studies have compared particle-size analysis methods for soils containing fine clay particles. The results showed significant differences between the techniques. This study consisted of a series of hydrometer experiments designed to give greater understanding of the behavior of kaolinite clay during the ASTM 422-63 hydrometer test. The results were consistent with the aggregation of fine clay particles, possibly due to the known hydrolysis behavior of the sodium polyphosphate dispersants used in the experiment. To avoid a serious underestimation of the fraction of submicron clay particles in soils, dispersants that do not suffer from time-dependent hydrolysis should be evaluated for the hydrometer test.
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