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.
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.
- Sodium Hexametaphosphate is a dry powder dispersion agent used in mixing soil sample solutions.
- Dispersion Cup for Soil Dispersion Mixer with the 1L capacity to hold soil samples for testing.
- Soil Dispersion Mixer thoroughly mixes soil samples with a mixing blade.
- Sedimentation Cylinder also called a hydrometer jar, is used with the soil hydrometers for testing suspended solids.
- Soil Hydrometers measure suspended solids during testing. Select from models with a range of 0.995— 1.038 or -5—+60 g/L.
- Constant Temperature Bath maintains the uniform temperature in hydrometer testing.
- No. 10 Test Sieve used for moist preparation of the sample for working through the clay particles to maintain the moisture.
- No. 200 Test Sieve is used for washing the dry specimen through and collecting the reduced sample.
- 250ml Glass Beaker for mixing the soil specimen with water and sodium hexametaphosphate.
- Mortar and Rubber Pestle for air-drying preparation of the sample which can be used to break up dried clumps of soil to pass a No. 10 sieve.