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The laboratory test on a soil sample yields the following results: natural moisture content = 18%, liquid limit = 60%, plastic limit = 25%, percentage of clay sized fraction = 25%. The liquidity index and activity (as per the expression proposed by skempton) of the soil, respectively, are 
  • a)
    -0.2 and 1.4
  • b)
    0.2 and 1.4 
  • c)
    -1.2 and 0.714 
  • d)
    1.2 and 0.714 
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
The laboratory test on a soil sample yields the following results: nat...
Liquidity Index (IL) = 1 − IC

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The laboratory test on a soil sample yields the following results: nat...
Given Data:
Natural moisture content = 18%
Liquid limit = 60%
Plastic limit = 25%
Percentage of clay sized fraction = 25%

Calculating Plasticity Index (PI):
Plasticity Index (PI) is the difference between the liquid limit (LL) and the plastic limit (PL). It indicates the range of moisture content within which the soil exhibits plastic behavior.
PI = LL - PL
= 60% - 25%
= 35%

Calculating Liquidity Index (LI):
Liquidity Index (LI) is a measure of the liquidity or plasticity of the soil. It is calculated using the following formula:
LI = (w - PL) / PI
where w is the natural moisture content.

Substituting the given values:
LI = (18% - 25%) / 35%
= -7% / 35%
= -0.2

Calculating Activity:
Activity (A) is a measure of the sensitivity of the soil to changes in moisture content. It is calculated using the following formula:
A = (w - PL) / (LL - PL)
where w is the natural moisture content.

Substituting the given values:
A = (18% - 25%) / (60% - 25%)
= -7% / 35%
= -0.2

Interpretation of Results:
The calculated values for the Liquidity Index (LI) and Activity (A) of the soil sample are -0.2 each.

Explanation:
The negative value of the Liquidity Index indicates that the soil is in a solid state (non-plastic) and does not exhibit any plastic behavior. This means that the soil is dry and cannot be molded or deformed easily.

The Activity value of -0.2 indicates that the soil has a low sensitivity to changes in moisture content. This means that the soil's behavior is not significantly affected by changes in water content.
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The laboratory test on a soil sample yields the following results: natural moisture content = 18%, liquid limit = 60%, plastic limit = 25%, percentage of clay sized fraction = 25%. The liquidity index and activity (as per the expression proposed by skempton) of the soil, respectively, area)-0.2 and 1.4b)0.2 and 1.4c)-1.2 and 0.714d)1.2 and 0.714Correct answer is option 'A'. Can you explain this answer?
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The laboratory test on a soil sample yields the following results: natural moisture content = 18%, liquid limit = 60%, plastic limit = 25%, percentage of clay sized fraction = 25%. The liquidity index and activity (as per the expression proposed by skempton) of the soil, respectively, area)-0.2 and 1.4b)0.2 and 1.4c)-1.2 and 0.714d)1.2 and 0.714Correct answer is option 'A'. Can you explain this answer? for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about The laboratory test on a soil sample yields the following results: natural moisture content = 18%, liquid limit = 60%, plastic limit = 25%, percentage of clay sized fraction = 25%. The liquidity index and activity (as per the expression proposed by skempton) of the soil, respectively, area)-0.2 and 1.4b)0.2 and 1.4c)-1.2 and 0.714d)1.2 and 0.714Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The laboratory test on a soil sample yields the following results: natural moisture content = 18%, liquid limit = 60%, plastic limit = 25%, percentage of clay sized fraction = 25%. The liquidity index and activity (as per the expression proposed by skempton) of the soil, respectively, area)-0.2 and 1.4b)0.2 and 1.4c)-1.2 and 0.714d)1.2 and 0.714Correct answer is option 'A'. Can you explain this answer?.
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