SIEVE ANALYSIS OF SOIL

By :Muhammad Firdaus, ST, MT

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Introduction

• Soil properties depend on grain size

• Large granules used as the basis for nomenclature and classification of soil

• Analysis of soil particle size is the determination of the percentage of grain weight in one filter unit, with a particular hole diameter

Determination Type textural composition of soil particles

1. Sieve Analysis, technical analysis for coarse grained soil by using the filter diameter varies

Soil classification based on grain size according to Unified, ASTM, MIT and International

Nomenclatur

Sieve analysis ilustration :

2. Hydrometer Test, sieve analysis for the soil finer than 0.075 mm (sieve No.200)

• Some grain size will vary through the fluid at different rates according to the large granulated

• Tools hydrometer will sink deeper into the suspension solution when the density decreases

• Hirdometer analysis carried out on 2000 cm3 solution containing 50 grams of dry soil solution concentration at a depth of 5 cm was 5 gr/lt after precipitated for 80 minutes

Hydrometer test (sediment proccess)

Examples of semi-logarithmic graph of the results of particle size analysis

Some identification can be obtained from grain size curves, there are :1. Percentage of specific grain size2. Percentage total is greater or smaller than a certain particle

size3. Uniformity or range in the grain size distribution

In the graph, an indication of aggregate grading is shown by the coefficient of uniformity (Cu) and coefficient of gradation (Cc). Expressed by the equation:

Cu bigger range of large grain size, gradation good (well graded)Cu = 1, soil measuring approximately uniformCu < 4, uniformly graded soil areaD10 = 10 % of the total grain weight diameter smaller than a certain particle size.

))((

,1060

230

10

60

DD

DC

D

DC cu

Contoh Soal :Description of soil samples, W = 119,33 gr & Density Gs=

2,57. Image analysis results shown :

Conclution :Example for No.40 for sieve grain weight,= total weight – grain weight restrained= 119,33 – (0,00 + 18,11 + 24,30 + 21,44 )= 55,48 grPercentage of sieve on filter No.40,= (55,48/119,33)x 100% = 46,49 %Results count plotted on the graph, so that it can be result:D10 = 0,04 mm, D30 = 0,190 mm & D60 = 0,72 mm

between 1 & 3

So the soil categories is a good graded.

25,104,072,0

190,0,618

04,0

720,0 2

x

CC cu

Result plotted on graphics