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Treatment of Fly Ash For Use in Concrete

  • US 20090013907A1
  • Filed: 07/12/2007
  • Published: 01/15/2009
  • Est. Priority Date: 07/12/2007
  • Status: Active Grant
First Claim
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1. A process of treating fly ash for use as a cement additive for use in concrete comprising:

  • obtaining a quantity of fly ash that contains between 1 and 50% carbon, by weight, based upon loss on ignition (LOI) and which is considered unusable fly ash for concrete based upon foam index testing;

    mixing the fly ash with an activator solution sufficient to initiate a geopolymerization reaction and form a geopolymerized fly ash; and

    granulating the geopolymerized fly ash, wherein the geopolymerized fly ash is considered, at a minimum, usable fly ash for concrete according to foam index testing.

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