Sunday, July 15, 2012

Classification TEST

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This method describes the procedure for determining the relationship between the particle size distribution of fine and coarse aggregates and fine grained soils for all construction except concrete construction.


Obtain a sample from plant or other source as described in STP 105 or as otherwise directed.

Mix sample well and break up any clay lumps; especially in fine grained materials.

Use a quartering method or sample splitter to reduce sample to appropriate test size as shown in the table. Do not adjustment sample to the exact value.

Required Materials and Equipment

-Balance - sensitive to 0.1 g.

-Sieves - Canadian Metric Standard square mesh sieves of size as required for the type of gradation for the material being tested.

-Mechanical sieve shaker. -Containers - pans suitable for washing the sample.

-Drying apparatus - suitable pans and stove for drying the sample.


1. Dry sample to constant weight at a temperature not exceeding 110o C and .weight to the nearest 0.1 gram.. Place sample in a container and sufficient water to cover it.

. Agitate the contents of the container sufficiently to separate all particles finer than the 71 µm sieve, from the coarse particles. Break clay lumps with the fingers.

4. Bring all fine material into suspension and pour the wash water over the 71 µm sieve to remove suspended clay and silt.

5. Slowly pour the wash water over the 71 µm sieve taking care to avoid spilling coarse particles on the wash sieve.

6. Repeat washings until the wash water are clean.

7. Return material retained on the 71 µm sieve to the washed sample.

8. Dry washed sample to constant weight at temperature not exceeding 110o C and weigh to nearest 0.1 g.

. Nest the sieves with the finest sieve above the bottom pan and the coarsest sieve at the top.

10. Place the dried sample on the top sieve, place the sieves in the mechanical sieve shaker and shake for five minutes.

11. Weigh the material in the pan below the 71 µm sieve and record as the weight passing this sieve. Add the material resting on the 71 µm sieve to the material on the balance pan and record the total as the weight passing the next larger sieve. Repeat the procedure until all the material from each larger sieve has been weighed.


Record test data directly on Form which is arranged for detailed calculations.

Add weight of material washed through the 71 µm sieve to the weight passing each sieve before calculating percentages.

Finally the Classification

1. Passing # 00 sieve

. L.L=.8

. P.I=5.

Then The Soil is classified as

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