Homework SourseSieve Size Weight Retained gm Soil A 01 Soil B 01 3 in 1in 1
Solution
As per USCS CLASSIFIACTION DONE BY FOLLOWING OBSERVATIONS
Major divisions
Group symbol
Group name
Coarse grained soils
more than 50% retained on or above No.200 sieve
gravel If
> 50% of coarse fraction retained on No.4 sieve
clean gravel <5% smaller than No.200 Sieve
GW
well-graded gravel, fine to coarse gravel
GP
poorly graded gravel
gravel with >12% fines
GM
silty gravel
GC
clayey gravel
sand if
50% of coarse fraction passes No.4 sieve
clean sand
SW
well-graded sand, fine to coarse sand
SP
poorly graded sand
sand with >12% fines
SM
silty sand
SC
clayey sand
Fine grained soils
50% or more passing the No.200 sieve
silt and clay
liquid limit < 50
inorganic
ML
silt
CL
clay of low plasticity, lean clay
organic
OL
organic silt, organic clay
silt and clay
liquid limit 50
inorganic
MH
silt of high plasticity, elasticsilt
CH
clay of high plasticity, fat clay
organic
OH
organic clay, organic silt
Highly organic soils
Pt
peat
CALCULATION:
1.Sieve size
2.Wt. Retained in each sieve (gm)
3.Percentage on each sieve % (2/total)
4. Cumulative %age retained on each sieve
%Finer(100-Cumulative %age retained)
soil 1
soil 2
soil 1
soil 2
soil 1
soil 2
soil 1
soil 2
3 in
150
60
4.9
2
4.9
2
95.1
98
1 1/2 in
90
180
2.94
6
7.84(4.9+2.94)
8 (2+6)
92.16
92
3/4 in
390
12.745
20.585(7.84+12.745)
79.415
3/8 in
930
330
30.3921
11
50.9771 (20.585 + 30.39)
19(8+11)
49.0229
81
no.4
840
210
27.4549
7
78.432 (50.9771+27.754)
26 (19+7)
21.0568
74
no.10
360
480
11.765
16
90.197 (78.432 + 11.765)
42(26+16)
9.803
58
no.20
no.40
120
870
3.921
29
94.118 (90.197+3.921)
71(42+29)
5.882
29
no.100
no.200
60
510
1.96
17
96.078(94.118+1.96)
88(71+17)
3.922
12
pan
120
360
3.922
12
100(96.078+3.922)
100 (88+12)
0
0
total
3060
3000
100
100
so from above table clearly we can say that
As per Uscs
1. soil 1 is classified as coarse grained soil because 3.922 percent soil is finer than sieve number 200 (i.e > 50% of coarse fraction retained on No.4 sieve)
2. soil 2 is classified as coarse grained soil because 12 percent soil is finer than sieve number 200 (i.e > 50% of coarse fraction retained on No.4 sieve)
As per AASHTO CLASSIFIACTION DONE BY FOLLOWING OBSERVATIONS
General Classification
Granular Materials (35% or less passing the No. 200 sieve)
Silt-Clay Materials (>35% passing the (No. 200 sieve)
Group Classification
A-1
A-3
A-2
A-4
A-5
A-6
A-7
A-1-a
A-1-b
A-2-4
A-2-5
A-2-6
A-2-7
A-7-5 A-7-6
Sieve Analysis, % passing
(No. 10)
50 max
…
…
…
…
…
…
…
…
…
…
(No. 40)
30 max
50 max
51 min
…
…
…
…
…
…
…
…
(No. 200)
15 max
25 max
10 max
35 max
35 max
35 max
35 max
36 min
36 min
36 min
36 min
Characteristics of fraction passing 0.425 mm (No. 40)
Liquid Limit
…
…
40 max
41 min
40 max
41 min
40 max
41 min
40 max
41 min
Plasticity Index
6 max
N.P.
10 max
10 max
11 min
11 min
10 max
10 max
11 min
11 min1
from our calculations
soil 1 is classified asGranular Materials (35% or less passing the 200 NO. sieve) with group name A-1-A
soil 2 is classified asGranular Materials (35% or less passing the 200 NO. sieve) with group name A-1
| Major divisions | Group symbol | Group name | ||
| Coarse grained soils | gravel If | clean gravel <5% smaller than No.200 Sieve | GW | well-graded gravel, fine to coarse gravel |
| GP | poorly graded gravel | |||
| gravel with >12% fines | GM | silty gravel | ||
| GC | clayey gravel | |||
| sand if | clean sand | SW | well-graded sand, fine to coarse sand | |
| SP | poorly graded sand | |||
| sand with >12% fines | SM | silty sand | ||
| SC | clayey sand | |||
| Fine grained soils | silt and clay | inorganic | ML | silt |
| CL | clay of low plasticity, lean clay | |||
| organic | OL | organic silt, organic clay | ||
| silt and clay | inorganic | MH | silt of high plasticity, elasticsilt | |
| CH | clay of high plasticity, fat clay | |||
| organic | OH | organic clay, organic silt | ||
| Highly organic soils | Pt | peat |
