Water Cement Ratio Formula

 

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

This Blog contains supporting images which are property of Google only.