Identification
of soil:
For the identification of soil perform we may perform the following
tests
1) Visual examination:- In the visual examination we observe with
naked eye the following properties
-
colour
-
gradation
-
angularity
And decide whether it is course grained
or fine grained soil.
2) Feel test:-
In feel test we take small amount of
soil and add a few drops of water , rub it between our fingers and observe that
-
If large particle than it is sand.
-
If small particle than it is silt.
-
If small and soapy than clay.
3) Rolling test:- In rolling test take the sample soil
add few drops of water and make a ball out of it by keeping it on the palm and
rolling it .Now convert it into a thread.
-
If immediately crumbles without assuming
thread shape than it is sandy soil.
-
If it is converted to a ball and cracks
appear than it is silty soil.
-
If it is converted to thread of
3mm than clayey soil.
4) Strength test:-
Take soil and add few drops of
water make a cube out of it place it in
sun or in oven at 100oc when all the water is removed then try to
break it by hand.
-
In case of sandy soil it will break
easily.
-
In case of silty soil some pressure is
required.
-
In case of clay it can’t break easily.
5) Dispersion test:-
Take some dry soil and put it in a glass of water i.e., transparent glass
-
In case of sandy soil the particles will settle down in a very
short time i.e., few seconds.
-
In case of silty soil , it will take
some time to settle down .
-
In case of clayey soil,
it will take lot of time to settle down.
All the above tests are simple and are
performed to get the general idea about soil type.
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