Strength of concrete show an increase with _____

What is internal sulphates attack?

Concentration of water-soluble sulphates in water _______ ppm for severe exposure.

The addition of a pozzolanic admixture such as fly ash reduces the ________

Approximate ratio of direct tensile strength to flexural strength is ________

The quality of concrete, specifically a ________ permeability, is the best protection against sulphate attack.

Strength of concrete increase with _____

Approximate ratio of strength of the 30 cm cube to that of 15 cm cube is _________