For a concrete mix ratio of $1 : 2 : 4$ , the bulking of sand is $15$ % . If bulking correction is not applied to sand, then what would be the ratio of dry sand per unit volume of cement?

2

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2.35

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1.74

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Solution

The correct option is C $1.74$
According is $I S 2386$ the formula of bulking of sand

$= (\frac{A - B}{B}) \times 100$

$A$ =bulking sand
$B$ =dry sand
In question concrete mix ratio is given by $1 : 2 : 4$
Cement= X , sand = $2$ X, aggregate = $4$ X
$B u l k i n g o f s a n d = 15 %$
$15 = (\frac{A - B}{B}) \times 100 = (\frac{2 X - B}{B} \times 100) \to B = 1.739 X$
then ratio of dry sand to cement
$= \frac{B}{c e m e n t} = \frac{1.739 X}{X} = 1.739$

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For a concrete mix ratio of 1:2:4 , the bulking of sand is 15% . If bulking correction is not applied to sand, then what would be the ratio of dry sand per unit volume of cement?

For a concrete mix ratio of $1 : 2 : 4$ , the bulking of sand is $15$ % . If bulking correction is not applied to sand, then what would be the ratio of dry sand per unit volume of cement?