List on how much CO2 is released per used unit of cement or concrete
You are making a house ground in concrete or have just bought a sack of cement. You now want to know how much CO2 this has released when it was made. Here beneath is the list of answers that might help you.
Table of Content
Firstly - what is cement and concrete
Cement is made from a combination of elements such as calcium, silicon, aluminium, and iron.
The raw materials used include mainly limestone and clay, but used are also shells, chalk or marl combined with shale, slate, blast furnace slag, slica sand and iron ore is used.
When a mixture of these are heated in a special process with natural gas a hard rock-rock like substance is formed. When ground into a powder, this is what is called cement.
When concrete is mixed in different ratios with water and a special sant or rock, into a special slurry and then left to harden concrete is formed.
Why do cement and concrete release C02
As described above, during the production of cement from the raw materials, heat is used. The heat (1500 degree Celsius or 2700 degrees Farenheit) most often comes from natural gas, but also coal or oil, and is done in a special kiln.
The burning with coal, oil or natural gas also functions to provide CO2 that is fixed into the cement. This CO2 is then released when the cement is mixed into concrete and sat to harden.
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