What is cement made of?

Answer 1

Cement is made up of,

1. Calcareous materials (Limestone)
2. Argillaceous materials (clay)
3. Gypsum
4. Pozzolanic materials (flyash, pumicite.etc.,)
   

Generally cement is made up of,

1. Argillaceous material (clay)
2. Calcareous material (limestone)
3. Gypsum
4. Pozzolanic materials
   

Cement is a mixture of elements such as clay, limestone, sand and it's a powdery, fine and soft substance. It is mixed with water and become a solid mass called concrete.
Cement is made mostly of a mixture of elements that are found in natural materials such as limestone, clay, sand and/or shale.

The cement used in most concrete is called "Portland cement" and consists of finely powdered rock made from limestone, which includes calcium silicates, calcium oxide, and calcium sulfate.
Limestone, Clay, Sand, Stone or other Aggregates.
calcareous rocks(limestone)

argillaceous rocks(clay)

coal dust

gypsum

pozzolanic materials

iron ore

magnesium

alkalies
Raw Materials

It's important to have the correct proportions of calcium, silicon, aluminum, and iron. To achieve this mix the overall chemical composition and structure of the individual raw ingredients can vary. The most common two materials are limestone and clay with other industrial byproducts added (These may not be strictly "raw" materials). All the materials are crushed to a fine powder, put in a mixer, then into a kiln to make cement power.

The raw materials required for cement are, Calcareous materials (limestone) Argillaceous materials (clay) Gypsum Pozzolanic materials like fly ash, volcanic ash, pumicite.
the main ones are limestone and shale. Gypsum is also used to make the cement set more slowly.
Cement is mainly made from limestone (ordinary portland cement (OPC)) with other additive such as gypsum. It can also be made from blast furnace slag or fly ash from power stations with the addition of some limestone.