The unified system of soil grouping
No 4 sieve= 50%
200 sieve= 200%= 72
GW= well graded fine to gravel
High plasticity= LL 50
Low plasticity= LL 50
PI= LL- PL = 52-20 = 32. This soil is above A-line, this soil is inorganic of high plasticity.
200*0.075mm= 58.6 = > 35%,
LL =2g, PL = 1g
Pl=ll-pl = 2g – 1g= 10
10 is less than 40 thus it belongs to A-4 group, soil B1 (5-6ft))
The limits fall below the A-line, this soil is classified as OH and MH. These are inorganic soil of medium plasticity.
US sieve no <a href=”https://www.homeworkgain.com/downloads/mass-media/”>Mass</a> of soil retained on each sieve C.M of each sieve Percent finer= m-cm/m * 100
4 0 0 100
10 18.5 18.5 95.61
20 53.2 71.7 82.93
40 90.5 162.2 61.44
60 81.8 244 42.07
100 92.2 336.2 20.18
200 58.5 394.7 6.29
pan 26.5 421.2 0
Total = 421.2
From the graph above 0.23mm diameter is about 10% finer, 0.33mm is 30% and 0.48mm is 60% finer.
Uniformity coefficient= Dm/Dn= 0.48/0.23 = 2.08
Coefficient of gradation= D230/ D60 * D10 = 0.332 mm/0.48mm *0.23 mm= 0.99
Li= 0.73, wn= 44.5%, PI= 24.7
LI= Wn–PL/PI = 0.73= 44.5-PL/24.7 =
Plastic limit= 26.47%
200 sieve= 60
A fine grained<a href=”https://www.homeworkgain.com/downloads/narrators/”> soil</a> contains 50% or more materials that are smaller than no.200 sieve size
Like 50% liquid limit
PI= 0.73(55-20) = 25.554
WP= cl- pl= 55-30= 25%
Sieve= 36min, 72
Liquid limit= 41 min, 52
PI= 11 min, 21
Group index= 72-35 (0.2 + 0.005(52-40)) + 0.01(72-15)(21-10)
= 15.89 = 16
Category = A- 7-5 (16)
48-35(0.2 + 0.005(30-40)) + 0.01(48 -15)(11-10)
Sieve no. 200, 36 min = 58
Liquid limit, 40max. 38
PI, 11 min, 12
58-35(0.2 + 0.005(38-40)) + 0.01(58 -15)(12-10)
Sieve no 200, 36 min , 82
Liquid limit, 40 max, 32
PI, 11 min, 12
82-35(0.2 + 0.005(32 – 40) ) + 0.01(82 -15) (12-10)
Sieve no 200, 36 min 64
Liquid limit, 41. 41
PI, 11, 12
64-35(0.2 +0.005(41-40)) + 0.01(64 – 15) (14 10)
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