2. Introduction
Motorized sieve shaker is device which
• Shakes the particle and
• Separate the pure particle.
This device helps in
• Separating fine grained from course grained
particles.
• assessing particle size distribution of aggregate.
4. PARTS OF A SIEVE SHAKER
SIEVE VIBRATOR INDUCTION MOTOR GEAR
5. AIM
To expose sample to all opening of sieve.
To save time and effort in particle operations.
To increase accuracy in size determination of
aggregate.
Providing steady and repeated separation.
6. Feature
Electrically operated and mechanically driven.
Sieve diameter 3 in,8 in, 10in, etc.
Perfect for dry sieving
Oil bath for machine parts.
R0tation 12 sieve per minute.
7. Types of sieve
Woven wire sieve aperture(3.50mm), diameter
(100-400)mm.
Perforated plate sieve aperture 100mm
,diameter(200-400)mm.
American standard sieve
aperture125mm,diameter(200-300)mm.
10. Merits
Better design and better performance.
Eliminates personal errors involved in manual
sieving.
Instrument is durable.
Whole instruments are made of cast iron which
have high strength.
We can analysis sieve of various range from 80mm
to 4.75 mm for course aggregate.
Not only sands, it can analysis crushed rocks
,clays ,coal and granite.
11. Demerits
Sieve analysis below the size of 150 micro meter is
not accurate.
It is not appropriate for wet sieving.
Long and flat particles are hard to pass
13. Procedure
1. Obtain the soil sample which has already been
pulverized or washed by placing it on sieve No. 200 and
then dry it in an oven.
2. Arrange a nest of sieves including sieves No.4, 10, 16,
30, 40, 50, 100, 200 and Pan.
3. Place the stack of sieves in the mechanical sieves
shaker and sieve for 5 to 10 minutes.
Note that if the entire stack of sieves does not fit into
the shaker, perform a hand shaking operation until
the top few sieves can be removed from the stack and
then place the remained of the stack in the
mechanical shaker.
14. 4. Remove the nest of sieves from the shaker and
obtain the weight of material retained on each sieve.
Sum these weights and compare with the actual
weight taken.
A loss of more than 2 percent by weight of the residual
weight is considered unsatisfactory, and the test
should be repeated.
5. Compute the percent retained on each sieve by
dividing the weight retained on each sieve by the
original sample weight.
6. Compute the percent passing (or percent finer) by
starting with 100 percent and subtracting the
cumulative percent retained for that sieve.
17. Calculation and Result
The result are presented in the graph of percentage of passing
aggregate vs. sieve size.
%retained aggregate W sieve *100
W total
%passing aggregate =W below * 100
W total
Fineness modulus = cumulative% retained
100
Uniformity coefficient = D60
D10
18. Conclusion
From the graph we have concluded that different grade
of aggregate will be avail for different application e.g.
For pavement design aggregates should have low
permeability for water.
For foundation only course aggregates are required
etc.
Q. Between course and fine aggregates which will
have greater surface area?
