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: 70%, No. 200:
30%; liquid limit = 33; plastic limit = 12.
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 less than half of the soil is greater than No. 4 sieve, the soil
is either sands with fines or clean sands. Since this soil is above the "A" line on
the Atterberg plot (with LL = 33 and PI = 21) and the PI is greater than 7, the
group symbol is SC.
Therefore, the soil can be classified as SC – Clayey Sands.
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