Hydrometer - Particle Size Analysis Hydrometer Method...

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Particle Size Analysis - Hydrometer Method Vanessa Barela Student ID# 900240959 Group Members: Christine Dwyer, Anthony LeBaron, Sarah Gonzales, Phil Simmons Date of Test: Feb 1, 2007, Feb 2, 2007 and Feb 5, 2007 Date Submitted: Feb 24, 2007
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Introduction The Hydrometer Method of analyzing soil is used to determine the size distribution of particles that pass through the #200 sieve and have diameters from 0.001 mm to 0.075 mm. This method is used when after a basic sieve analysis, there is more than 20% passing the #200 sieve. This allows for a better analysis of the soil and classification. Theory The Hydrometer Method is based on Stokes’ Law, which helps determine the velocity of particles; each particle has a specific gravity at which it falls based on gravitational forces, viscosity, and the particle size. The basic Stokes’ Law, which assumes that a sphere is: 2 2 9 2 - = D G G v f s η [1] When: v = particle velocity G s = specific gravity of particles G f = specific gravity of solution η = fluid viscosity D = particle diameter t = time elapsed in minutes 2
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For the Hydrometer Analysis Stokes’ Law must be changed to determine the diameter of the particles, see Equation 2.
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