Superplasticizer-concrete composition for waste disposal
AssigneeUnion Oil Company of California
InventorWilliam C. Allen
Life of this patent
Estimating the term…
Abstract
A solidified waste is formed from a difficult-to-compact hydraulic cement slurry for use in the disposal of hazardous waste. The slurry contains inorganic non-compactible hydraulic cement particles, a concrete superplasticizer compound, water, and filler particles containing radionuclide and/or toxic contaminants. The slurry is then transferred to a storage vessel, such as a subterranean formation, to cast a stronger, denser solidified waste than a comparable solidified waste containing no superplasticizer.
Claims54
A method for disposing of waste by preparing a waste-containing hydraulic cementitious composition, said method comprising:
- mixing solid particles comprising dry hydraulic cement and waste-containing filler particles with a superplasticizer and water to form a mobile slurry wherein essentially all of said solid particles being of average cross-sectional dimension greater than aobout 1 micron, said solid particles comprising greater than 50 dry weight percent of said hydraulic cement, and said slurry containing less than 25 weight percent of free water relative to the weight of said dry hydraulic cement;
- transferring said slurry into a storage vessel;
- and
- permitting said slurry to harden into a concrete composition containing stabilized waste contaminants.
A method for disposing of waste by producing a solidified waste, said solidified waste produced from a mixture of a solid component and a liquid component, said solid component containing at least 10 dry weight percent of particles of a waste-containing filler comprising radionuclide and/or chemical toxic contaminants and at least 50 dry weight percent of particles of hydraulic cement wherein essentially all of said particles of said cement and said filler are of average cross-sectional dimension greater than 1 micron and less than 18 millimeters, and said liquid component containing water and an active superplasticizer component, said method comprising the following steps:
- (1) mixing said liquid component and said solid components, said liquid component containing less than 25 weight percent of free water relative to the weight of said dry hyraulic cement;
- (2) transporting the mixed components from step (1) to a storage vessel;
- and
- (3) permitting the mixed components from step (1) to harden into a stabilized solidified waste comprising a concrete composition in the presence of sufficient water to fully hydrate said cement.
A hydraulic cement slurry composition comprising an aggregate component containing a non-compactible hydraulic cement and waste-containing filler particles, and a liquid component comprising sufficient water to fully hydrate said hydraulic cement, and at least one active superplasticizer component and wherein essentially all of the solid particles of said aggregate component being of average cross-sectional dimension greater than about 1 micron, said aggregate component comprising greater that 50 dry weight percent of said non-compactible hydraulic cement, and said slurry containing less than 25 weight percent of free water relative to the weight of the dry non-compactible hydraulic cement.
A pumpable slurry composition comprising a non-compactible hydraulic cement/filler slurry comprising an aggregate component comprising hydraulic cement particles and waste-containing filler particles, and sufficient water to fully hydrate said hydraulic cement particles, said composition further comprising at least one active superplasticizer component, and wherein said hydraulic cement particles and said waste-containing filler particles having essentially all particles of average cross-sectional dimension at least about 1 micron and less than about 18 millimeters, said aggregate component comprising greater than 50 dry weight percent of said hydraulic cement particles, and said slurry containing less than 25 weight percent of free water relative to the weight of said dry hydraulic cement particles.
A cementitious composition comprising:
- (1) homogeneously arranged, fully hydrated or precipitated cementitious inorganic solid particles, essentially all of which are of average cross-sectional dimension at least about 1 micron;
- and
- (2) densely packed waste-containing solid filler particles, essentially all of which are of average cross-sectional dimension at least about 1 micron and less than about 18 millimeters;
- and
- wherein said particles of (1) and an active superplasticizer component are homogeneously distributed in the volume between said particles of (2) and said particles of (2) comprise up to 50 weigth dry weight percent of the total solid particles of said composition.
A hardened concrete composition prepared by mixing solid particles comprising dry hydraulic cement and waste containing filler particles with about 0.1 to 4 weight percent of an active superplasticizer compound, relative to the dry weight of said solid particles, and water to form a mobile slurry wherein essentially all of said solid particles being of average cross-sectional dimension greater than about 1 micron, said solid particles comprising greater than 50 dry weight percent of said hydraulic cement, and said slurry containing less than 25 weight percent of free water relative to the weight of said dry hydraulic cement:
- transferring said slurry into a storage vessel;
- and
- permitting said slurry to harden into a concrete composition containing stabilized waste contaminants.
A cementitious composition prepared by mixing a solid component and a liquid component, said solid component containing at least 10 dry weight percent of particles of a waste-containing filler comprising radionuclide and/or chemical toxic contaminants and at least 50 dry weight percent of particles of type K cement wherein essentially all of said particles of said cement and said filler are of average cross-sectional dimension greater than about 1 micron and less than 18 millimeters, and said liquid component containing less than 25 weight percent fee water relative to the weight of said dry cement and 0.01 to 5 weight percent of an active superplasticizer compound, relative to the dry weight of said solid particles;
- transporting the mixed components to a storage vessel;
- and
- permitting the mixed component to harden into a stabilized solidified waste comprising a concrete composition in the presence of sufficient water to fully hydrate said cement.
Dependencies are inferred from the claim text.