Question

Portland cement is manufactured by using:

• A. Limestone, clay and sand
• B. Limestone, gypsum and sand
• C. Limestone, gypsum and alumina
• D. Limestone, clay and gypsum

Answer 1

The correct option is D Limestone, clay and gypsum

Portland cement is the most common type of cement general use around the world, used as a basic ingredient of concrete mortar, stucco and most non-speciality grout. It developed from other types of hydraulic lime in England in the mid 19th century and usually originates from limestone.

It is a fine powder produced by heating materials in a kiln to form what is called clinker, grinding the clinker, and adding small amounts of other materials. Several types of Portland cement are available with the most common being called ordinary Portland cement (OPC) which is grey in colour, but a white Portland cement is also available.

Portland cement is manufactured by using Limestone, clay and gypsum.