Treatment of Fly Ash For Use in Concrete
First Claim
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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Accused Products
Abstract
A process for treating fly ash to render it highly usable as a concrete additive. A quantity of fly ash is obtained that contains carbon and which is considered unusable fly ash for concrete based upon foam index testing. The fly ash is mixed with an activator solution sufficient to initiate a geopolymerization reaction and for a geopolymerized fly ash. The geopolymerized fly ash is granulated. The geopolymerized fly ash is considered usable fly ash for concrete according to foam index testing. The geopolymerized fly ash may have a foam index less than 35% of the foam index of the untreated fly ash, and in some cases less than 10% of the foam index of the untreated fly ash. The activator solution may contain an alkali metal hydroxide, carbonate, silicate, aluminate, or mixtures thereof.
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Citations
35 Claims
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1. A process of treating fly ash for use as a cement additive for use in concrete comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A process of treating fly ash for use as a cement additive for use in concrete comprising:
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obtaining a quantity of fly ash that contains carbon and has a foam index; 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 has foam index less than 35% of the foam index of the untreated fly ash. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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Specification