2.1, 2.4 and 2.5 Limestone and its Uses/Cement and Concrete/Limestone Issues Flashcards
How do we remove limestone from the ground?
We quarry it
What is limestone mainly made up of?
Calcium carbonate (CaCO3)
What happens in lime kilns?
Thermal decomposition of calcium carbonate to get calcium oxide and carbon dioxide
What is meant by the term thermal decomposition?
Breaking down by heating
Name 3 uses of limestone
- blocks of it are used for building
- make calcium oxide
- make cement and then concrete etc
How do we make cement?
Mix limestone with clay and heat strongly in a kiln, then grind up the product into a fine powder
How do we make mortar?
Mix cement with sand and water
What is mortar used for?
To hold bricks and blocks together in buildings
How is concrete made?
Mix mortar with aggregate
What do you do to concrete before it hardens?
Pour it into moulds
Where are cement works usually close to?
Limestone quarries
What is involved in making cement?
Heating limestone with clay in large kilns
What does the production of cement use a lot of?
Energy and land
Name 3 advantages for an area where limestone is quarried
- more employment for locals
- more customers and trade for local businesses
- improved roads
Name 3 disadvantages for an area where limestone is quarried
- dust and noise
- more traffic
- loss of habitats for wildlife
