Manufacture of articles from fly ash
AssigneeNewSouth Innovations Pty Limited
InventorsObada Kayali, Karl John Shaw
Life of this patent
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Abstract
Methods of forming a shaped article having a matrix that contains sintered fly ash are disclosed that include forming a fly ash dough that includes fly ash and water. In one form a superplasticizer is added in the dough. A green article is formed in a desired shape from the fly ash dough that is subsequently fired so that the shaped article is hardened by sintering its fly ash matrix. In one form, the green article is cured under conditions of moderate heating and high humidity. A building element having a matrix of sintered fly ash is also disclosed.
Claims20
A method of forming a shaped article having a matrix containing sintered fly ash, said method comprising the steps of:
- forming a mixture containing calcium oxide and incorporating principally class F fly ash, water and a superplasticiser, wherein the calcium oxide is provided in the fly ash and the content of the calcium oxide is less than 10% by dry weight;
- forming a green article in a desired shape from the fly ash mixture;
- and
- firing the green article at a temperature in the range of 1100° C. to 1250° C. so that the shaped article is hardened by sintering its fly ash matrix, wherein the shaped article is a building brick.
A method of forming a shaped article having a matrix containing sintered fly ash, said method comprising the steps of:
- forming a fly ash mixture containing calcium oxide wherein the calcium oxide is provided in the fly ash and the content of the calcium oxide is less than 10% by dry weight;
- forming a green article in a desired shape from the fly ash mixture;
- and
- firing the green article at a temperature in the range of 1100° C. to 1300° C. so that the shaped article is hardened by sintering its fly ash matrix.
Dependencies are inferred from the claim text.