Question

Portland cement is made from lime, silica, alumina, iron oxide and gypsum.

• A. True
• B. False

Answer 1

The correct option is A True

Portland cement is mostly used in construction work. It is made from 60% lime (calcium oxide), 25% silica (silicon dioxide), 5% alumina, iron oxide and gypsum (calcium sulphate).
Its name is derived from its similarity to Portland stone which was quarried on the Isle of Portland in England.