SOIL CLASSIFICATION
vThere are 4 types of Soil classification:-
1) IS Particle Size soil Classification
2) HRB:- Highway Research Board Classification
3) USCS :- Unified Soil Classification System
4) ISCS :- Indian Standard Classification System
1) IS Particle Size Soil Classification:-
2) HRB:- Highway Research Board Classification:-
Suitable for Highway pavement design.
According to HRB classification soil are divided into groups called as ‘Group Numbers’.
i.e. Group A1 = Gravel
A2 =
.
.
.
A6 = Black Cotton Soil
A7 = Organic Soil
Higher the group number lower the Performance
· Group Index (GI) :-
A) % finer then 75µ
B) Atterberg Limit
Higher the group index lower the performance
3) USCS :- Unified Soil Classification System:-
This system based on,
a) Particle Size Distribution
b) Atterberg Limit
c) Compressibility
4) ISCS :- Indian Standard Classification System
This system based on,
a) Particle size distribution
b) Atterberg limit
c) Compressibility
Soil Classification Based On Grain Size
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Er. Vaibhav Jadhav
Er. Ketan Pattekar.
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