Question
Download Solution PDFA soil sample is tested for its plasticity index and the obtained value of plasticity index is 21. In such case, the soil sample can be described as:
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
Liquid limit (WL): The water content at which soil changes its consistency from plastic to a liquid state.
Plastic limit (WP): The water content at which soil changes its consistency from brittle/crumbly to a plastic state.
Shrinkage limit (WS): A state when the decrease in moisture content leads to solid-state, no change in volume of soil mass is observed, the consistency of soil changes from semi to solid-state. The boundary water content is called shrinkage limit.
Plasticity index (IP) = WL - WP
Where, WL = Liquid limit, WP = Plastic limit, WN = Natural water content
Based on the plasticity index, the soil may be classified as followed:
|
Plasticity Index |
Soil Description |
Soil Type |
|
0 |
Non-plastic |
Sand |
|
1 – 7 |
Low plastic |
Silt |
|
7 - 17 |
Medium plastic |
Silty clay |
|
> 17 |
Highly plastic |
Clay |
Last updated on May 28, 2025
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