Q. Which of the following is the main ingredient that is used to make cement?
a. Calcium
b. Silicon
c. Aluminum
d. All of the above
Cement is manufactured through a closely controlled chemical combination of calcium, silicon, aluminum, iron and other ingredients. Common materials used to manufacture cement include limestone, shells, and chalk or marl combined with shale, clay, slate, blast furnace slag, silica sand, and iron ore.