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What does the term 'plasticity index' indicate in soil mechanics?

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Question: What does the term \'plasticity index\' indicate in soil mechanics?

Options:

  1. The range of moisture content over which soil behaves plastically
  2. The soil\'s shear strength
  3. The soil\'s compaction characteristics
  4. The soil\'s permeability

Correct Answer: The range of moisture content over which soil behaves plastically

Solution: 

The plasticity index indicates the range of moisture content over which soil behaves plastically, calculated as the difference between the liquid limit and plastic limit.

What does the term 'plasticity index' indicate in soil mechanics?

Practice Questions

Q1
What does the term 'plasticity index' indicate in soil mechanics?
  1. The range of moisture content over which soil behaves plastically
  2. The soil's shear strength
  3. The soil's compaction characteristics
  4. The soil's permeability

Questions & Step-by-Step Solutions

What does the term 'plasticity index' indicate in soil mechanics?
  • Step 1: Understand that 'plasticity index' is a term used in soil mechanics.
  • Step 2: Know that it measures how much moisture a soil can hold while still being plastic (able to change shape).
  • Step 3: Learn that the plasticity index is calculated by finding the difference between two specific moisture contents: the liquid limit and the plastic limit.
  • Step 4: The liquid limit is the moisture content at which soil changes from a plastic state to a liquid state.
  • Step 5: The plastic limit is the moisture content at which soil changes from a semi-solid state to a plastic state.
  • Step 6: The formula for plasticity index is: Plasticity Index = Liquid Limit - Plastic Limit.
  • Plasticity Index – The plasticity index is a measure of the plasticity of soil, defined as the difference between the liquid limit and the plastic limit, indicating the moisture range where soil can deform without cracking.
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