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
4.
Apparatus
British standard sieve
Pan Balance – sensitive to 0.1 gram
Mechanical Sieve Shaker
Mortar and pestle
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
6.
Data and result
sieve
#7
(2.36mm)
#14
(1.18mm)
#25
(0.600mm)
#36
(0.42mm)
#52
(0.30mm)
#72
(0.212mm)
#100
(0.150mm)
#200
(0.07mm)
pan
Total
sieve and
the soil
mass were
receptive
mass of
land mass
empty sieve were
receptive
percent
were
receptive
(%)
449
382
67
33.5
total
percentage
of
transparency
(%)
66.5
398
357
41
20.5
46
363
327
36
18
28
313
294
19
9.5
18.5
307
283
18
9
9.5
290
277
13
6.5
3.0
272
268
4
2
1.0
260
258
2
1
0
243
243
0
200
0
0
7.
Discussion
1) plot the graph and calculate the value of Cc and Cu
Uniformitycoefficient :-
Cu =
Cu = 6.63
Grading coefficient:-
Cc =
Cc = 1.089
8.
Reference
1. Donald Mcglinchey, , Characterisation of bulk solids, 2005, CRC
Press DT Afrika.
2. Mazlan Mohammad Abdul Hamid, Standard aggregate sieve
analysis TEST, ASTM International - Standards Worldwide, (July
2008) ASTM C136-06, retrived from http://www.astm.org/
3. Norliza Muhammad, concrete laboratory,(2006). Gradation Test.
(2007), NorlizaMuhammad,FajarBaktiSdn. Bhd.
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