Fig. 1: Balance
The balance to be used must be sensitive to the extent of 0.1% of total weight of sample taken.
Dry and Wet Sieve Analysis is carried out to quantitatively determine the
Particle/Grain Size Distribution for soil particles of size 75 micron and bigger.
For soil particles of size 4.75 mm and bigger, dry sieve analysis is done and for soil
particles of size above 75 micron and below 4.75 mm, wet sieve analysis is done.
The balance to be used must be sensitive to the extent of 0.1% of total weight of sample taken.
I.S sieves (100 mm, 63 mm, 20 mm, 10 mm, 4.75 mm, 2.00 mm, 1.18 mm, 0.600 mm, 0.425 mm, 0.300 mm, 0.150 mm and 0.075 mm). I.S 460-1962 to be referred. The sieves set should have lid at top and Pan at base.
Mechanical Sieve Shaker
Thermostatically Controlled Hot Air Oven
IS-2720 (Part 4):1985 (Reaffirmed- May 2015) â€śMethods of test for soils: Grain size analysis".
Maximum size of material present in substantial quantities | Weight to be taken for test |
---|---|
75 mm | 60 kg |
40 mm | 25 kg |
25 mm | 13 kg |
19 mm | 6.5 kg |
12.5 mm | 3.5 kg |
10 mm | 1.5 kg |
6.5 mm | 0.75 kg |
4.75 mm | 0.40 kg |
Table 1: Quantity of sample taken for Test
I.S Sieve Number/Size (mm) | Wt. retained in each Sieve (gm) | Percentage retained on each sieve | Cumulative percentage retained on each Sieve | % Finer |
---|---|---|---|---|
100 | ||||
63 | ||||
20 | ||||
10 | ||||
4.75 | ||||
2.00 | ||||
1.18 | ||||
0.600 | ||||
0.425 | ||||
0.300 | ||||
0.150 | ||||
0.075 | ||||
PAN |
Table 2
In the case of clayey soils, dry sieving shall not be used and wet sieving shall be used.
Fig. 8 : Plot of Percent Finer vs. Particle Diameter
Fig. 9 : General nature of grain-size distribution of well graded, poorly graded and gap graded soil
Fig. 10 : Soil Classification based on percent finer vs. grain size