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: 89%, No. 200:
65%; liquid limit = 44; plastic limit = 23.
What will be an ideal response?
Use Table 17.3.
Since the less than half of the material is larger than No. 200 sieve and the Liquid
Limit is less than 50, the soil is in the silts and clays division. Since this soil is
above the "A" line on the Atterberg plot (with LL = 44 and PI = 21), and the PI is
greater than 7, the group symbol is CL.
The soil can be classified as CL – Low-plasticity Clay.
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