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A soil has percentage air voids of the order of 30%. It has a porosity of 0.4 The air content of that soil shall be: -
  • a)
    0.75
  • b)
    0.12
  • c)
    1.33
  • d)
    0.70
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
A soil has percentage air voids of the order of 30%. It has a porosity...
Given data:
Percentage air voids = 30%
Porosity = 0.4

To find:
Air content of the soil

Solution:
Porosity is defined as the ratio of the volume of voids to the total volume of soil.

Porosity = Volume of voids / Total volume

We know that Volume of solids = Total volume - Volume of voids

Let Vv be the volume of voids and Vs be the volume of solids.

Porosity = Vv / (Vv + Vs)

0.4 = Vv / (Vv + Vs)

0.4 (Vv + Vs) = Vv

0.4 Vv = 0.4 (30/100) (Vv + Vs) = 0.12 (Vv + Vs)

Air content = Volume of air / Total volume

Volume of air = Volume of voids
Volume of solids = Total volume - Volume of voids

Volume of air = Vv
Total volume = Vv + Vs

Air content = Vv / (Vv + Vs) = 0.4 / 0.6 = 0.75

Therefore, the air content of the soil is 0.75. Hence, option (a) is the correct answer.
Free Test
Community Answer
A soil has percentage air voids of the order of 30%. It has a porosity...
Percentage of air voids(Na)=porosity (N) X Air content (Ac)
0.3=0.4Ac
Ac=0.75
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A soil has percentage air voids of the order of 30%. It has a porosity of 0.4 The air content of that soil shall be: -a)0.75b)0.12c)1.33d)0.70Correct answer is option 'A'. Can you explain this answer?
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A soil has percentage air voids of the order of 30%. It has a porosity of 0.4 The air content of that soil shall be: -a)0.75b)0.12c)1.33d)0.70Correct 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 A soil has percentage air voids of the order of 30%. It has a porosity of 0.4 The air content of that soil shall be: -a)0.75b)0.12c)1.33d)0.70Correct 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 A soil has percentage air voids of the order of 30%. It has a porosity of 0.4 The air content of that soil shall be: -a)0.75b)0.12c)1.33d)0.70Correct answer is option 'A'. Can you explain this answer?.
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