Approximate ratio of the strength of the cement conc of 7 days to that of 28 days (2/3)?

The breaking up of cohesion in a mass of concrete is called ____

Strength of concrete is proportional to __________

Fly ash affects the sulphate attack.

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

Plain cement concrete is strong in taking _______

The continuous strain, which the concrete undergoes due to application of external loads, is called ______

What is external sulphates attack?