Cement is a mixture of

Cement is an important component of building material.

 It was first introduced in England in 1824 by Joseph Aspdin. It is also called Portland cement because it resembles the natural limestone quarried in the Isle of Portland, England.

The percentage of the compounds of Portland cement-I is as follows:

Dicalcium silicate ${\mathrm{Ca}}_2{\mathrm{SiO}}_4 -26\%$

Tricalcium silicate ${\mathrm{Ca}}_3{\mathrm{SiO}}_5 -51\%$

Tricalcium aluminate ${\mathrm{Ca}}_3{\mathrm{Al}}_2{\mathrm{O}}_6 -11\%$

The mixture of cement includes Lime, sand, and alumina.