Naked Science Forum

Life Sciences => The Environment => Topic started by: dentstudent on 03/12/2008 10:57:27

Title: What is it about the manufacturing of cement....?
Post by: dentstudent on 03/12/2008 10:57:27
 that makes it so environmentally unfriendly?

We live in and around an extinct volcano and there is nearby a small open-caste extraction of the rock. Not being a geologist, I've no idea about what they're extracting, but it seems that cement is being made. I've heard that this process is one of the most environmentally unfriendly ones around. Is it just the energy used to make the cement or are there other factors, such as carbon release from the extracted ores?

Thanks!
Title: What is it about the manufacturing of cement....?
Post by: Bored chemist on 03/12/2008 20:00:41
It involves digging holes in the ground which isn't generally viewed as environmentally friendly. The extracted limestone is then heated (using lots of fuel) with clay etc and gives off the CO2 it contains.
That's a trebble whammy.
Then they use it to concrete over green stuff or make roads for yet more cars to run on ...
Title: What is it about the manufacturing of cement....?
Post by: dentstudent on 04/12/2008 07:40:05
The usual suspects then...ta BC
Title: What is it about the manufacturing of cement....?
Post by: dentstudent on 05/12/2008 07:44:54
Quote from: gfdshr on 05/12/2008 07:41:40
Quote from: dentstudent on 03/12/2008 10:57:27
that makes it so environmentally unfriendly?

We live in and around an extinct volcano and there is nearby a small open-caste extraction of the rock. Not being a geologist, I've no idea about what they're extracting, but it seems that cement is being made. I've heard that this process is one of the most environmentally unfriendly ones around. Is it just the energy used to make the cement or are there other factors, such as carbon release from the extracted ores?

Thanks!










Yeah, i think so, its very cold here.  [???]Cabal gold cheap.

Could this be the return og WOWgold?



MOD EDIT - YOU MAY WANT TO DELETE THIS NOW THAT THE SPAMMY POST ABOVE HAS GONE - THANKS!
Title: What is it about the manufacturing of cement....?
Post by: elmejor on 18/12/2008 06:21:18
never heard of this. cement from volcano! can you elaborate on more, how it is not good for the environment?
Title: What is it about the manufacturing of cement....?
Post by: lyner on 20/12/2008 21:40:26
The Pantheon Roof in Rome used concrete from a volcano.
Title: What is it about the manufacturing of cement....?
Post by: elmejor on 03/01/2009 11:13:16
okay it must be fly ash, it is not a replacement of cement, it is added with cement. and it increases the life of construction by 40-50 years if used in proper proportions!
Title: What is it about the manufacturing of cement....?
Post by: lyner on 03/01/2009 13:28:27
 You must be right - the 'cement' process involves calcium hydroxide, which would have to come from a sedimentary rock rather than an igneous one.
(I did use the word concrete - not cement in my last post)