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Grain size analysis

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This document provides information on sieve analysis testing of soils based on IS 2720 Part 4. It discusses the objectives of classification of soils, coefficient of curvature, uniformity coefficient, and fineness modulus. Sieve analysis is used to determine gradation of soils, mix design proportions, and filter design. The test involves sieving soil samples through a series of sieves and weighing the material retained on each sieve. Calculations are made to determine coefficients and fineness modulus.

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SIEVE ANALYSIS (IS 2720 PART4) Sawanpreet Singh Anoop Singh Engineering Soil Testing
Objectives  Classification of Soil  Coefficient of curvature  Uniformity coefficient  Fineness Modulus
Applications  Gradation of soil: Well graded Poorly 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
Theory  Coefficient of Curvature : Cc = D30 2 D10 x D60 Between 1 -3 : Well graded gravel and sand
Theory  Uniformity Coefficient : Cu = D60 D10 More than 4 - Well graded gravel More 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 soil
Apparatus  Two set of sieves: Set1: IS sieves of size 300mm, 80mm, 40mm, 20mm, 10mm, 4.75mm Set 2 : IS sieves of size 2mm,0.85mm,0.425mm,0.15mm,0.075mm  Mechanical Shaker  Brush  Oven
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.
Grain size analysis
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
Observations and Calculations IS Sieve 2.36m m
Observations and Calculations IS Sieve 1.18m m
Observations and Calculations IS Sieve 0.600m m
Observations and Calculations IS Sieve 0.300mm
Observations and Calculations IS Sieve 0.150mm
Observations and Calculations IS Sieve 0.075mm
Observations and Calculations Pan
Observations and Calculations
Observations and Calculations
Result
Grain size analysis
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Grain size analysis