The Ratio between weight of water
and weight of cement is called water cement ratio.
Formula of water cement ratio is
given below
WCR = W/C
Water Cement Ratio = Weight of Water
/ Weight of cement
Water cement ratio is mathematical
expression having no units but it can be expressed in percentage for example if
we find WCR =.6 using job mix formula ,the amount of water may be calculated
from formula as below.
WCR = W/C
Water Cement Ratio = Weight of Water
/ Weight of cement---------Eq.no.1
Putting Values in Eq.no.1
considering Weight of One bag of cement.
0.6= (Weight of water /50 Kgs)
Weight of water = 0.6 x 50 Kgs =
30-Kgs
Here we knows that 1Kg = 1 Liter
So we can say according to designed
WCR 30-Liters or 30-Kgs of water will be added to concrete mix.
WCR is designed formula for use of
water in concrete mix with respect of weight of cement and it is very important
for workability and strength of concrete. More water in concrete improves
workability (Ease in concreting) of concrete but on other hand it decreases the
strength of concrete.
Roughly Water Cement Ratio for Concrete
(1:2:4) = 0.60
Concrete (1:1.5:3) = 0.50
Concrete (1:1:2) = 0.45
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