Concrete mix with low water-cement ratio provides better strength.

Cement requires water (1/4th the quantity of cement) for it to react and aquire stone-like properties. 

However, 1:4 water-cement ratio doesn't give a workable mix to have a proper cast. Additional water is required.
This additional water leaves as the concrete matures, leaving pores on the RCC product. These microscopic pores are desirable for expansion and contraction of the product with changing weather conditions. However, too much of water causes internal cracks, reducing the strength of the product.
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