Title: Treatment of fly ash for use in concrete

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.

Inventors:

Boxley, Chett; Akash, Akash; Zhao, Qiang

Issue Date:

2013-01-08

Research Org.:

Ceramatec, Inc. (Salt Lake City, UT)

Sponsoring Org.:

USDOE

OSTI Identifier:

1082904

Patent Number(s):

8349071

Application Number:

13/450,286

Assignee:

Ceramatec, Inc. (Salt Lake City, UT)

Patent Classifications (CPCs):

C - CHEMISTRY C04 - CEMENTS C04B - LIME, MAGNESIA

Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE Y02P - CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

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C - CHEMISTRY C04 - CEMENTS C04B - LIME, MAGNESIA

C04B12/005 - {Geopolymer cements, e.g. reaction products of aluminosilicates with alkali metal hydroxides or silicates}
C04B14/044 - {Polysilicates, e.g. geopolymers}
C04B18/08 - Flue dust {, i.e. fly ash}
C04B20/023 - {Chemical treatment}
C04B20/04 - Heat treatment
C04B7/243 - {Mixtures thereof with activators or composition-correcting additives, e.g. mixtures of fly ash and alkali activators}

Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE Y02P - CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

Y02P40/10 - Production of cement

Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE Y02W - CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT

Y02W30/91 - Use of waste materials as fillers for mortars or concrete

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DOE Contract Number:  

FG02-05ER84197

Resource Type:

Patent

Country of Publication:

United States

Language:

English

Subject:

36 MATERIALS SCIENCE