The amount of gypsum, usually, added in the manufacture of cement is

Granite is mainly composed of

According to Indian standard specifications, the temperature for curing is

The durability of concrete is proportional to

The addition of pozzolana to Portland cement causes

The average out-turn of first class bricks in kiln burning is

The compressive strength of sandstone is

The setting and hardening of cement paste is mainly due to the hydration and hydrolysis of

For railway ballast, the stone should be