Treatment of fly ash for use in concrete

Patent · Tue May 15 00:00:00 EDT 2012

OSTI ID:1043828

Boxley, Chett ^[1]

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1. Park City, UT

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 a quantity of spray dryer ash (SDA) and water to initiate a geopolymerization reaction and form 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 40%, and in some cases less than 20%, of the foam index of the untreated fly ash. An optional alkaline activator may be mixed with the fly ash and SDA to facilitate the geopolymerization reaction. The alkaline activator may contain an alkali metal hydroxide, carbonate, silicate, aluminate, or mixtures thereof.

• Research Organization: Ceramatec, Inc. (Salt Lake City, UT)
• Sponsoring Organization: USDOE
• DOE Contract Number: FG02-05ER84197
• Assignee: Ceramatec, Inc. (Salt Lake City, UT)
• Patent Number(s): 8,177,906
• Application Number: 12/275,437
• OSTI ID: 1043828
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE