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If in a concrete mix, the fineness modulus of coarse aggregate is 6.2, the fineness modulus of fine aggregate is 2.0, and the economical value of the fineness modulus of combined aggregate is 5.2 then the proportion of the fine aggregate is
  • a)
    25%
  • b)
    28.25%
  • c)
    31.25%
  • d)
    33.33%
Correct answer is option 'C'. Can you explain this answer?
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If in a concrete mix, the fineness modulus of coarse aggregate is 6.2,...
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If in a concrete mix, the fineness modulus of coarse aggregate is 6.2,...
The proportion of fine aggregate in a concrete mix can be determined using the fineness modulus of the coarse and fine aggregates.

The fineness modulus (FM) is a measure of the fineness or coarseness of an aggregate. It is calculated by adding the cumulative percentage of aggregate retained on each of the standard sieves (i.e., 4.75 mm, 2.36 mm, 1.18 mm, 600 micron, 300 micron, 150 micron, and 75 micron) and dividing by 100.

Given:
Fineness modulus of coarse aggregate (FMc) = 6.2
Fineness modulus of fine aggregate (FMf) = 2.0
Economical value of the fineness modulus of combined aggregate (FMe) = 5.2

To find the proportion of fine aggregate in the mix, we can use the formula:

Proportion of fine aggregate = (FMe - FMc) / (FMf - FMc) * 100

Substituting the given values into the formula:

Proportion of fine aggregate = (5.2 - 6.2) / (2.0 - 6.2) * 100
= (-1) / (-4.2) * 100
= 0.2381 * 100
= 23.81%

Therefore, the proportion of fine aggregate in the mix is 23.81%.

However, the options provided in the question are in percentage form, so we need to convert our answer to percentage. To do this, we divide the proportion by 100:

Proportion of fine aggregate = 23.81% / 100
= 0.2381

Now, we need to find the option that is closest to the calculated proportion.

Options:
a) 25%
b) 28.25%
c) 31.25%
d) 33.33%

By comparing the calculated proportion (0.2381) with the options, we can see that option c) 31.25% is the closest value. Therefore, the correct answer is option c).
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If in a concrete mix, the fineness modulus of coarse aggregate is 6.2, the fineness modulus of fine aggregate is 2.0, and the economical value of the fineness modulus of combined aggregate is 5.2 then the proportion of the fine aggregate isa)25%b)28.25%c)31.25%d)33.33%Correct answer is option 'C'. Can you explain this answer?
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If in a concrete mix, the fineness modulus of coarse aggregate is 6.2, the fineness modulus of fine aggregate is 2.0, and the economical value of the fineness modulus of combined aggregate is 5.2 then the proportion of the fine aggregate isa)25%b)28.25%c)31.25%d)33.33%Correct answer is option 'C'. Can you explain this answer? for Civil Engineering (CE) 2025 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about If in a concrete mix, the fineness modulus of coarse aggregate is 6.2, the fineness modulus of fine aggregate is 2.0, and the economical value of the fineness modulus of combined aggregate is 5.2 then the proportion of the fine aggregate isa)25%b)28.25%c)31.25%d)33.33%Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for If in a concrete mix, the fineness modulus of coarse aggregate is 6.2, the fineness modulus of fine aggregate is 2.0, and the economical value of the fineness modulus of combined aggregate is 5.2 then the proportion of the fine aggregate isa)25%b)28.25%c)31.25%d)33.33%Correct answer is option 'C'. Can you explain this answer?.
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