A soil sample has the following Atterberg limits;

Liquid Limit (LL) = 80

Plastic Limit (PL) =30

Classify the soil sample using the plasticity chart

Question

A soil sample has the following Atterberg limits;

Liquid Limit (LL) = 80

Plastic Limit (PL) =30

Classify the soil sample using the plasticity chart

BlackTom AI · Accepted Answer

The question asks to classify the soil sample using the Atterberg limits and the plasticity chart.
First, compute the Plasticity Index (PI): PI = LL - PL = 80 - 30 = 50. A PI of 50 is a high plasticity value.
Next, locate the point on the plasticity chart with LL = 80% and PI = 50% (since PL = 30, LL = 80 gives PI = 50). On the standard plasticity chart, soils with LL in the high range (roughly >50) and PI around 40–60 typically fall into the CH region, which stands for clay of high plasticity.
Breakdown of possible interpretations:
- If one expected CL (low-plasticity clay), that would require a lower LL and/or lower PI, typically LL around 30–50 and PI below about 20–25, which is not the case here.
- If the soil were silt or sand with low plasticity, the LL and PI values would be much lower, placing the point in the ML or ML/OL or even near the CL/ML boundary, not at LL = 80 and PI = 50.
- If one considered CH/MH or other headings, those regions are defined by higher LL and higher PI; with LL = 80 and PI = 50, the point clearly aligns with the high-plasticity clay region on the chart.
Therefore, the appropriate classification for this soil, given LL = 80% and PL = 30% (PI = 50), is clay of high plasticity, CH.
Note: While actual chart reading can depend slightly on the specific chart scale, the combination of very high LL and high PI strongly supports the CH designation rather than CL, ML, MH, or OL regions. The given answer reflects this interpretation.

A soil sample has the following Atterberg limits; Liquid Limit (LL) = 80 Plastic Limit (PL) =30 Classify the soil sample using the plasticity chartSingle choice

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