2. Objective
students should be able to :-
determine the grain size distribution of a soil sample with the sieving
classify and predict the movement of ground water table
3. Theory
soil grain size distribution obtained from the analysis of particle size. This analysis
can be described quantitatively the heavy rate of particle sizes in the different
soils. percent were receptive defined as the weight content of each sieve divided
by the total weight of the sample. percent transparency to a sieve size is defined as
100% were receptive to gauge the total percentage of the sieve above. graph%
transparency against the sieve pore is drawn on semi-logarithmic graph so that the
soil gradation curve is obtained.
Uniformity coefficient is defined as:-
Grading coefficient is defined as :-
Where :D60 - grain size at 60% transparency
D30 - grain size at 30% transparency
D10 - grain size at 10% transparency
5. Procedure
1) Crushed dry land of approximately 250 g in a mortar with a pestle until all
particulate rubber is separated
2) Weigh all the pots and the sieve accurate to 0.1g. sort sieves with pan and
cover
3) Weighing 200g in 0.1g soil and the soil sieve using sieve shaker machine
for 5 minutes
4) Weighing each sieve and its contents accurate at 0.1g. total weight of soil
remaining on each sieve and pan
5) Compare the weight of the land used 200g. if it is a big difference than
1.0g, please repeat this experiment
6) Reserve land that is transparent sieve # 36 (all land below sieve # 36) for
test no 4