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 and 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 aluminate cement, a calcium sulfate and a chemical activator with water
Claims21
An aluminosilicate geopolymer cementitious composition comprising a reaction product of:
- a cementitious reactive powder comprising:
- about 35 to about 96% by weight a thermally activated aluminosilicate mineral;
- about 9 to about 45% by weight a calcium aluminate cement in an amount of 1-100 parts by weight per 100 parts by weight of thermally activated aluminosilicate mineral;
- and
- about 1 to about 45% by weight a calcium sulfate selected from the group consisting of calcium sulfate dihydrate, calcium sulfate hemihydrate, anhydrous calcium sulfate and mixtures thereof, the calcium sulfate in an amount of 2 to 100 parts by weight per 100 parts by weight of calcium aluminate cement;
- and
- a chemical activator selected from the group consisting of alkali metal salt, alkali metal base, and mixtures thereof in an amount equal to about 1.0 to about 6.0% by weight based on total weight of the cementitious reactive powder;
- and
- at least one member of the group consisting of superplasticizers, air entraining agents, defoaming agents, organic rheology control agents, and film-forming polymers;
- and
- water.
A settable composition for forming an aluminosilicate geopolymer cementitious composition when reacted in water, comprising
- a settable mixture of:
- a cementitious reactive powder comprising:
- about 35 to about 96% by weight of a thermally activated aluminosilicate mineral;
- about 9 to about 45% by weight of a calcium aluminate cement;
- about 1 to about 45% 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 the group consisting of an alkali metal salt and an alkali metal base, or mixtures thereof in an amount equal to about 1.0 to about 6.0% by weight based on total weight of the cementitious reactive powder;
- and
- at least one member of the group consisting of superplasticizers, air entraining agents, defoaming agents, organic rheology control agents, and film-forming polymers.
(canceled)
Dependencies are inferred from the claim text.