SIEVE ANALYSIS(IS 2720 PART4)
Sawanpreet SinghAnoop Singh
Engineering Soil Testing
Objectives
Classification of Soil
Coefficient of curvature Uniformity coefficient Fineness Modulus
Applications
Gradation of soil:Well gradedPoorly graded
Proportioning of soil for mix design
Design of filters
Theory
If more than 50% of sample is retained on IS Sieve 4.75mm,sample is gravel
If more than 50% of sample passes through IS Sieve 4.75mm,sample is sand
Theory
Coefficient of Curvature :
Cc = D302
D10 x D60
Between 1 -3 : Well graded gravel and sand
Theory
Uniformity Coefficient :
Cu = D60
D10
More than 4 - Well graded gravelMore than 6 – Well graded sand
(IS 1498 - 1970)
Theory
Fineness modulus (FM) :
sum of total percentage of the FM = sample retained on each sieve
100
2 – 4 : fine soil6.5-8 : coarse soil
Apparatus
Two set of sieves:
Set1: IS sieves of size 300mm, 80mm, 40mm, 20mm, 10mm, 4.75mmSet 2 : IS sieves of size 2mm,0.85mm,0.425mm,0.15mm,0.075mm
Mechanical Shaker Brush Oven Weigh balance
Procedure
For sample retaining on 4.75mm sieve ,Use set 1 – 5kg sample
For sample passing through 4.75mm sieve,Use set 2 – 1kg sample
Procedure
Clean all the sieves and pan properly with brush.
Arrange the sieves according to size, with pan at bottom and size increasing upwards.
Put the sample in top sieve and Place it in the shaker.Ensure that the sieves are held tightly in the shaker.
Procedure
Operate the shaker for 5-10 minutes.
Weight the material retained on each sieve to nearest 1 gram.
Precautions
While drying, the temperature of oven should not be more than 105°C because higher temperature may cause permanent change in 0.075mm material.
During shaking, soil sample should not be allowed to come out.
For plotting, percent finer should be determined with respect to total soil taken for initial analysis.
Observations and Calculations
IS Sieve2.36mm
Observations and Calculations
IS Sieve1.18mm
Observations and Calculations
IS Sieve0.600mm
Observations and Calculations
IS Sieve0.300mm
Observations and Calculations
IS Sieve0.150mm
Observations and Calculations
IS Sieve0.075mm
Observations and Calculations
Pan
Observations and Calculations
Observations and Calculations
Result
Thank You!!
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