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Figure 4.1: Sieve Analysis
• Fine To determine the grain size distribution of material passing the 75m sieve the hydrometer method is commonly used. The soil is mixed with water and a dispersing agent, stirred vigorously, and then allowed to settle to the bottom of a measuring cylinder. As the soil particles settle out of suspension, the specific gravity of the mixture reduces. An hydrometer is used to record the variation of specific gravity with time, Figure 4.2. By making use of Stoke’s Law, which relates the terminal velocity of a free falling sphere to its diameter, the test data is reduced to provide particle diameters and the % by weight of the sample finer than a particular particle size.

Figure 4.2: Sedimentation Analysis
The …show more content…
Some typical grading curves are shown on Figure 4.3. The following descriptions apply to these curves.

W Well graded material U Uniform material
P Poorly graded material C Well graded with some clay
F Well graded with an excess of fines
The use of names to describe typical grading curve shapes and positions has developed as the suitability of different grading types for different purposes has become apparent. For example, well graded sands and gravels can be easily compacted to relatively high densities which result in higher strengths and stiffness. For this reason, soils of this type are preferred for road bases. The suitability of different gradings is discussed in some detail by Terzaghi and Peck (1967).
4.1.5 Criteria of Grading
Parameters Obtained From Grain Size Distribution Curve:
Effective Size is the maximum particle size of the smallest 10% of the sample. It is given the symbol D10. It is obtained by reading off from the chart the size at which the grading curve cuts the horizontal line through 10 percent. It has been found that the effective size of a soil is related to the ease with which water passes through the soil.
D10 = Effective Size (maximum particle size of the smallest 10% of the sample)

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