w/c ratio is directly proportional to workability and inversely proportional to strength.

If w/c ratio is increased workability increased, which increase the ease and homogeneity with which it can be handled and mixed.

But as w/c ratio is increased the strength of concrete becomes poor.

Because proper proportion of water if not maintained in concrete mix, excess water accumulates in the mix and reduces the strength.

Factors affecting shrinkage:-

1. one of most important factors that affect shrinkage is the drying condition or in other words the relative humidity of the atmosphere.
2. w/c ratio.