Question

what is portland cement​

Answer 1

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

Answer 2

cement manufactured from chalk and clay which hardens under water and when hard resembles Portland stone in colour.