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The laboratory test results of the soil sample are given below:
Liquid limit = 37%
Plastic limit = 22%
% passing through 75 μ sieve = 26%
% retained over 4.75 mm IS sieve = 65%
% retained over 0.075 mm but passing through 4.75 mm = 26%
As per IS 1498 – 1970, the soil is classified as:
  • a)
    GC
  • b)
    SC
  • c)
    CI
  • d)
    GM
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
The laboratory test results of the soil sample are given below:Liquid ...
% passing through 75 μ sieve = 26%
% retained over 75 μ sieve = 100 – 26% = 74 % > 50%
Hence the soil is coarse grained soil.
As, larger proportion of soil is retained over 4.75 mm IS sieve, so the soil is termed as Gravel.
Now, % fineness = 26% > 12%
So, use Ip to further classify the soil
IP = wL - wP = 37 – 22 = 15%
IP = 15% > 7%
So, soil is termed as clayey Gravel.
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Most Upvoted Answer
The laboratory test results of the soil sample are given below:Liquid ...
Classification of Soil Sample

Given Data:
- Liquid limit = 37%
- Plastic limit = 22%
- % passing through 75 µ sieve = 26%
- % retained over 4.75 mm IS sieve = 65%
- % retained over 0.075 mm but passing through 4.75 mm = 26%

Classification:
- According to IS 1498 – 1970, the soil sample is classified based on the values of liquid limit, plastic limit, and particle size distribution.
- Based on the given test results, the soil sample falls under the group symbol "GC."

Explanation:
- The liquid limit of 37% indicates that the soil is in the inorganic clay group.
- The plasticity index (37% - 22% = 15%) falls within the range for the inorganic clay group.
- The percentage passing through the 75 µ sieve, retained over 4.75 mm IS sieve, and retained over 0.075 mm but passing through 4.75 mm fall within the specified limits for the GC group.
- Therefore, based on the given data, the soil sample is classified as GC according to IS 1498 – 1970.
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