Hydrometer analysis of soil is widely used in testing the distribution of soil particle sizes. Testing is performed with specific products and required sedimentation methods to determine silt and clay fractions.
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The basic equipment needed for hydrometer analysis in conformance with ASTM D7928, ASTM D422, and AASHTO T 88 standards includes Stirring Apparatus, Soil Hydrometers, Hydrometer Sedimentation Cylinder, Sodium Hexametaphosphate, and a Constant Temperature Bath. Soil specimens are mixed in a solution of water and sodium hexametaphosphate.