AASHTO T176Full Name AASHTO T176 – Standard Method of Test for Plastic Fines in Graded Aggregates and Soils by Use of the Sand Equivalent TestScope This test is intended to serve as a rapid test to show the relative proportions of fine dust or claylike material in soils or graded aggregates.Keywords clay soil; plastic fines; plasticity; sand equivalentResourcesAASHTO Website Need more info?