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Data from a sieve analysis conducted on a given sample of soil showed that 67% of the particles passed through 75 micron IS sieve. The liquid limit and plastic limit of the finer fraction was found to be 45 and 33 percents respectively. The group symbol of the given soil as per IS:1498-1970 is
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- SC
- MI
- CH
- MH
Correct Option: B
Since more than 50% n of sample pass through 75µ sieve, it is fine grained soil.
wL = 45%
Q WL > 35% and < 50%, it is intermediate compressible
(I) Equation of A-line
Ip = 0.73 (WL – 20)
= 0.73 (45 – 20) = 18.25%
∴ Ip is below A line,
∴ it is silty soil (m)
∴ Group symbol is MI
