AIM
To conduct sieve analysis of soil to classify the given coarse grained soil.
THEORY
Grain size analysis is used in the engineering classification of soils. Particularly coarse
grained soils. Part of suitability criteria of soils for road, airfield, levee, dam and other
embankment construction is based on the grain size analysis. Information obtained
from the grain size analysis can be used to predict soil water movement. Soils are
broadly classified as coarse grained soils and fine grained soils. Further classification
of coarse grained soils depends mainly on grain size distribution and the fine grained
soils are further classified based on their plasticity properties. The grain size
distribution of coarse grained soil is studied by conducting sieve analysis.
APPARATUS REQUIRED
1. A set of Sieves 4.75 mm, 2.36 mm ,1.18 mm ,0.60mm, 0.425 mm, 0.30
mm 0.15 mm 0.075mm including lid and pan
2. Tray
3. Weighing Balance
4. Sieve Shaker
5. Brush
PROCEDURE
1. Weigh 500gms of soil sample, of which grain size distribution has to be studied.
2. Clean the sieve set so that no soil particles were struck in them.
3. Arrange the sieves in order such that coarse sieve is kept at the top and the
fine sieve is at the bottom. Place the closed pan below the finest sieve.
4. Take the soil obtained into the top sieve and keep the lid to close the top sieve.
5. Position the sieve set in the sieve shaker and sieve the sample for a period of
10 minutes.
6. Separate the sieves and weigh carefully the amount of soil retained on each
sieve, This is usually done by transferring the soil retained on each sieve on a
separate sieve of paper and weighing the soil with the paper.
7. Enter the observations in the Table and calculate the cumulative percentage of
soil retained on each sieve.
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