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Batching of Concrete

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Question

What is the amount of water required for a workable RC of mix 1 : 2 : 4 by weight when w/c ratio is 0.6 and unit weight of concrete is 2400 kg/ $m^{3}$ ?

A

165 L

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B

205 L

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C

245 L

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D

285 L

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Solution

The correct option is B 205 L
$C e m e n t q u a n t i t y = \frac{1}{7} \times 2400 = 342.86 k g$
$S o, w a t e r q u a n t i t y = 0.60 \times 342.86 = 205.7 l i t e r$

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