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The Sand Equivalent Test indicates the portion of undesirable clay-like fines in granular soils and fine aggregates. It is also used in the Durability Index Test, measuring the resistance of aggregates to producing clay-like fines when subjected to degradation. The sample is placed in a clear plastic cylinder with sand equivalent solution, consisting of calcium chloride, formaldehyde, and glycerine. After agitating the cylinder, it is allowed to stand for a sedimentation period. Readings are taken for the clay suspension, and for the sand level. "Sand Equivalent" is the sand reading divided by the clay reading x 100.
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