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the difference between the clay-size particle or clay minerals.
Please remind students about the oxymoron
of the cohesion and cohesionless.
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Mention sieve analysis and hydrometer
analysis for different size of soils
There is not distinguish for silt and clay in the USCS system.
It is not necessary to use the full set
of sieves, but the particle size should be distinguished.
According to the British standard, dry sieving may be carried out only on materials
for which this procedure gives the same results as the wet-sieving procedure.
This means that it is applicable only to clean granular materials, which
usually implies clean sandy or gravelly soils-that is, soils containing
negligible amounts of particles of silt or clay size. Normally the wet-sieving
procedure (section 4.6.4) should be followed for all soils (Head, 1992).
Effective size (D10): This parameter is
the diameter in the particle-size distribution curve corresponding to 10%
finer. The effective size of a granular soil is a good measure to estimate the
hydraulic conductivity an ddrainage through soils.