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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 Kempton) 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?
Most Upvoted Answer
The laboratory test on a soil sample yields the following results: na...
To determine the liquidity index (LI) and activity of a soil sample, we need to consider its natural moisture content (w), liquid limit (LL), plastic limit (PL), and percentage of clay-sized fraction (%Clay). Let's calculate these parameters step by step.

1. Natural Moisture Content (w):
The given natural moisture content is 18%.

2. Liquid Limit (LL):
The liquid limit is the moisture content at which the soil transitions from a liquid to a plastic state. The given liquid limit is 60%.

3. Plastic Limit (PL):
The plastic limit is the moisture content at which the soil starts to behave plastically. The given plastic limit is 25%.

4. Percentage of Clay-Sized Fraction (%Clay):
The given percentage of clay-sized fraction is 25%.

Now, let's calculate the different parameters:

a) Plasticity Index (PI):
The plasticity index is the difference between the liquid limit and the plastic limit. It indicates the range of moisture content within which the soil behaves as a plastic material.
PI = LL - PL
= 60% - 25%
= 35%

b) Liquidity Index (LI):
The liquidity index is calculated using the following formula:
LI = (w - PL) / PI
= (18% - 25%) / 35%
= -7% / 35%
= -0.2

c) Activity (A):
The activity is a measure of the sensitivity of the soil to changes in moisture content. It is calculated using the expression proposed by Kempton:
A = (%Clay) / (LL - PL)
= 25% / (60% - 25%)
= 25% / 35%
= 0.714

Therefore, the calculated values for the Liquidity Index (LI) and Activity (A) of the soil sample are -0.2 and 0.714, respectively.

Hence, the correct answer is option 'A' (-0.2 and 1.4).
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Community Answer
The laboratory test on a soil sample yields the following results: na...
Liquidity Index (IL) = 1 - IC
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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 Kempton) 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 Kempton) 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 Kempton) 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 Kempton) 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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