How to calculate the quantity of water for a given concrete mix

How to calculate the quantity of water for a given mix concrete. As it would be required to calculate for mix 1:2:4.

As per Is code 456-200 clauses 6.1.2

maximum free water cement ratio for M15(1:2:4) is 0.50

for 1 cubic metre concrete

1+2+4=7

cement content =1/7 *1 =0.1428 m3

density =mass/volume

density of cement =1440kg/m3 (note :- density of cement varies with grade and brand)

mass of cement =0.1428*1440=205.632 kg (note:- please consider minimum cement content also i.e. also given in clauses 6.1.2 of Is code)

w/c as per IS code is 0.50 for M15

w/c=0.50

water content=0.50*205.632=102.8 m3 =103 litre

Note:-w/c depends on various factors like moisture content of fine/coarse aggregate,workability.

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