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The standard plasticity chart by Casagrande’s to classify fine-grained soils is shown in the figure. The marked P represents

The standard plasticity chart by Casagrande’s to classify fine-grained soils is shown in the figure. The marked P represents Correct Answer Inorganic clays of high plasticity

Explanation:

1. For soil to be organic its liquid limit at oven-dry sample must be less than ¾ of the given liquid limit. Since oven-dry liquid limit is not given, organic or inorganic nature cannot be predicted accurately. However, any soil which lies below A- line is organic in nature. So, Point P represents inorganic soil.

2.  Degree of Compressibility

 WL < 35%: Low compressible

35% ≤ WL ≤ 50%: Intermediate compressible

WL > 35%: High compressible

∴ Point P represent high compressible soil.

3. Type of soil (silt or clay)

Soil above A-line is clay and soil below A –line is either silt or organic as per A Casagrande’s.

∴ Point P represent Clay.
Finally, Point P represent inorganic clay with highly compressible ( high plasticity).

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