The following results were obtained by a mechanical sieve analysis. Classify the soil using the Unified Soil Classification System (USCS).
Sieve Analysis, % Passing by Weight No. 4: 100%, No. 40: 63%, No. 200:
13%; liquid limit = 26; plastic limit = 8.
What will be an ideal response?
Use Table 17.3.
Since more than half of the material is larger than No. 200 sieve, the material is
Coarse-grained. Since more than half of the soil is smaller than No. 4 sieve, the
soil is either sands with fines or clean sands. Since the soil is above the “A” line
on the Atterberg plot (with LL = 26 and PI = 18) and the PI is greater than 7, the
group symbol is GC.
Therefore, the soil can be classified as SC – Clayey Sands.
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