Making Cement More Green and Fluffy
I like recycling, I think it’s a great idea. So I thought that I should look into how I could use recycled materials in my work.
I’ve heard lots of people mention Fly Ash as an additive to cement. Fly ash, (AKA Pulverised Fuel Ash or Blast Furnace Slag) is the stuff left over after burning coal. You can use it as a replacement for some of the Cement you use for concrete. Great eh? I spoke to a big cement producer in South Africa and they told me that the cement I was using already had 20% Fly Ash in it (apparently they caught onto this quite a long time ago) and soon they’d be producing cement with 40% Fly Ash in it. Hurrah! I was being recycling(ish) without even knowing it!
I’ve heard lots of people mention Fly Ash as an additive to cement. Fly ash, (AKA Pulverised Fuel Ash or Blast Furnace Slag) is the stuff left over after burning coal. You can use it as a replacement for some of the Cement you use for concrete. Great eh? I spoke to a big cement producer in South Africa and they told me that the cement I was using already had 20% Fly Ash in it (apparently they caught onto this quite a long time ago) and soon they’d be producing cement with 40% Fly Ash in it. Hurrah! I was being recycling(ish) without even knowing it!
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2 comments:
But you are aware of how unsustainable the cement making process is don't you?
Heating the clinker to the required 1450 degrees requires a lot of energy - fine(ish) in countries like Sweden where they use wood chips but not so good in countries like Nigeria (and I would imagine South Africa) where they use crude oil...
Yup, cement production is a huge polluter.
I'm in touch with a Dutch guy (www.Arcilla.com) who is developing a material which has all the properties of cement, but is made using waste materials and no heat is required to produce it.
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