How many times in each layer of concrete rodded in a slump cone?

Portland cement is composed of four major oxides (CaO, SiO2, Al2O3, Fe2O3 ≥90%).

After placing each layer in a slump cone, the concrete in the cone is tapped to remove remaining voids.

Which of the following is correct for Low Heat Cement?

When concrete is to be laid under water _______ is to used.

In the soundness test a specimen of hardened cement paste is ___ for a fixed time.

Which cement is used for the construction of water-retaining structure like tanks, reservoirs, retaining walls, swimming…

Why do we need Standard Consistency Test?