Approximate ratio of direct tensile strength to flexural strength is ________

The separation of water or water-cement mixture from the freshly mixed concrete is known as bleeding.

Durability of concrete is proportional to _____

Strength of concrete increase with _____

For concrete exposed to a very aggressive environment the w/c should be lower than ______

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

Low w/c ratio helps to control suphate attack.

When the ________ content is low, most ettringite will be formed in the plastic state.