For the Water Concrete Mix Weaker Than is Not Used

For the Water Concrete Mix Weaker Than is Not Used

As per IS: 456, 

The water-Cement ratio lies between 0.4 to 0.6. If the ratio is less than 0.4, the concrete becomes very stiff, and we need a plasticizer or superplasticizer for required workability. 

And if the ratio is greater than 0.6, concrete becomes very lean and weak, and it can also erode the structure. 

As per IS: 456, from table no. 5 

Minimum cement content, maximum water-cement ratio and a minimum grade of concrete for different Exposures with a normal weight aggregate of 20 mm Nominal maximum size. The water content also depends upon the size of the aggregate.

As per IS: 12262: 2009 

Maximum Water Content per cubic Metre of Concrete for Nominal Maximum Size of Aggregate

Nominal Maximum Size of Aggregate	Maximum Water Content (in kgs)
10	208
20	186
40	165

Summary

For the Water Concrete Mix Weaker Than is Not Used

As per IS: 456, The water-cement ratio should not exceed 0.6. It can weaken the concrete and erode it as well. 

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