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Rocks

Rock Products and Uses - Limestone.

Cement and Concrete.

Powdered limestone is mixed with powdered clay
and heated in a rotary kiln to produce cement.
Cement is a fine gray powder which is used to make mortar and concrete.

Mortar is made by mixing cement with lime, sand and water.
Mortar is used in between bricks or stones for wall building,
or as a covering surface for walls.

Concrete is made by mixing cement with sand, water and rock pieces.
The rock pieces (called aggregate) may be of various sizes.

Concrete sets like stone, and is widely used as a building material.
Concrete can be reinforced with steel rods or cables,
making the material stronger.


Glass.

Glass is made by heating a mixture of limestone, sand and sodium carbonate.
Glass is a mixture of calcium silicate and sodium silicate.

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