Manufacture of articles from fly ash
AssigneeUnisearch 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 superplasticiser 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.
Claims29
A method of forming a shaped article having a matrix containing sintered fly ash, said method comprising the steps of:
- blending fly ash together with water to produce a fly ash dough;
- forming a green article in a desired shape from the fly ash dough;
- and
- firing the green article so that the shaped article is hardened by sintering its fly ash matrix, wherein the green article is fired having a moisture content in the range of 1 to 5%.
(canceled)
A method according to claim 7 wherein a superplasticiser is included with the fly ash and water in the fly ash dough.
(canceled)
A method of forming a shaped article having a matrix containing sintered fly ash, said method comprising the steps of:
- forming a mixture incorporating principally class F fly ash, water and a superplasticiser;
- forming a green article in a desired shape from the fly ash dough;
- and
- firing the green article so that the shaped article is hardened by sintering its fly ash matrix.
A building element having a matrix of sintered fly ash and having a compressive strength of greater than 30 MPa, a modulus of rupture greater than 5 Mpa, an initial rate of absorption (IRA) of between 0.2 to 5 kg/m2/min and an absorption capacity of between 5-20%.
Dependencies are inferred from the claim text.