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Question

Consider a soil sample, for which test yield the following results:
Passing 75 micron sieve 62%
Liquid limit 35%
Plasticity index 14%
As per the group index classification of soil, what is the soil condition of the above soil sample?

A
Poor
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B
Fair
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C
Good
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D
Excellent
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Solution

The correct option is B Fair
p=62%
LL=35%
Ip=14%
GI=0.2a+0.005ac+0.01bd
a=p35
=6235
=2740=27
b=p15
=6215
=4740=40
c=LL40=0
d=Ip10=1410=4
GI=0.2×27+0.005×27×0+0.01×40×4
=5.4+1.6=7

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