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Concrete Facts...

Discussion in 'The Lounge' started by Ryan B., Feb 7, 2004.

  1. Ryan B.

    Ryan B. 3/4 ton status GMOTM Winner

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    Yes... Concrete...

    The majority of atmospheric CO2 comes from fossil fuel combustion and deforestation, but a small amount comes from cement production. That's right -- cement production.

    The type of cement that we typically use today is known as Portland cement, which is 60 percent calcium carbonate (CaCO3). Cement manufacturers cook substances high in CaCO3, like limestone and chalk, to produce lime, in a process called calcination. Calcination leaves us with Calcium Oxide (CaO) and Carbon Dioxide (C02). Concrete is made by adding sand and gravel to the cement.

    In 1991, the Inter-Governmental Panel on Climate Change or IPCC, attributed seven percent of world-wide CO2 emissions to cement production. That equaled 1.56 billion tons of CO2 annually.

    Some organizations have been working toward a more environmentally friendly cement. The Eco-Smart Project, a joint effort by industry and government agencies in Canada, is dedicated to reducing CO2 emissions by using "supplemental cementing materials". These include industry by-products such as fly ash, blast furnace slag, husk ash, and silica fume. By replacing 30 to 60 percent of the actual cement in the concrete, not only are CO2 emissions reduced, but cost is lowered as well.


    http://www.weathernotebook.org/transcripts/2003/03/25.php

    http://www.oneidagroup.com/concrete_facts.htm


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  2. lady bog

    lady bog 1/2 ton status

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    What's with all the concrete??? /forums/images/graemlins/confused.gif /forums/images/graemlins/dunno.gif
     
  3. landsmasher

    landsmasher 1/2 ton status

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    Talking about Beaver Oil got old... /forums/images/graemlins/histerical.gif
     
  4. chevyfumes

    chevyfumes Court jester

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    Watch for the muzzleflash!
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  5. skratch

    skratch 1/2 ton status

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    Yup, Yup.
    I always wondered what was with the excess fly ash we used.
    Now I know, very interesting /forums/images/graemlins/thinking.gif
     

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