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

Approximate ratio of direct tensile strength to flexural strength is ________

In order to avoid segregation, the concrete should not be thrown from a height.

The philosophy of prescribing low ________ cement to improve resistance to sulphate attack.

What is internal sulphates attack?

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

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

What is external sulphates attack?