Dimensionally stable geopolymer composition and method
AssigneeUnited States Gypsum Company
InventorAshish Dubey
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Abstract
A method for making geopolymer cementitious binder compositions for cementitious products such as concrete, precast construction elements and panels, mortar, patching materials for road repairs and other repair materials, and the like is disclosed. The geopolymer cementitious compositions of some embodiments are made by mixing a synergistic mixture of thermally activated aluminosilicate mineral, calcium sulfoaluminate cement, a calcium sulfate and a chemical activator with water.
Claims56
An aluminosilicate geopolymer composition comprising the reaction product of:
- a cementitious reactive material comprising:
- about 33 to about 97% by weight a thermally activated aluminosilicate mineral comprising Class C fly ash,
- about 1 to about 43% by weight a calcium sulfoaluminate cement,
- about 1 to about 40% by weight a calcium sulfate selected from the group consisting of calcium sulfate dihydrate, calcium sulfate hemihydrate, anhydrous calcium sulfate and mixtures thereof;
- and
- a chemical activator in an amount equal to about 1.0 to about 6.0% by weight of the cementitious reactive material, the chemical activator selected from at least one member of the group consisting of alkali metal citrates;
- and
- water,
- wherein the calcium sulfate has an average particle size from about 1 to about 100 microns.
A settable mixture for forming an aluminosilicate geopolymer composition when reacted in water, comprising:
- a cementitious reactive material comprising:
- about 33 to about 97% by weight of a thermally activated aluminosilicate mineral comprising Class C fly ash;
- about 1 to about 43% by weight of a calcium sulfoaluminate cement,
- about 1 to about 40% by weight of a calcium sulfate selected from the group consisting of calcium sulfate dihydrate, calcium sulfate hemihydrate, anhydrous calcium sulfate and mixtures thereof;
- and
- a chemical activator selected from at least one member of the group consisting of alkali metal citrates, wherein the chemical activator is present in an amount equal to about 1.0 to about 6.0% by weight of the cementitious reactive material.
Dependencies are inferred from the claim text.