Superplasticizer-concrete composition and method of preparation
AssigneeUnion Oil Company of California
InventorWilliam C. Allen
Life of this patent
Estimating the term…
Abstract
A concrete pipe liner is formed from a difficult-to-compact hydraulic cement slurry applied to a pipe interior. The slurry contains inorganic non-compactible hydraulic cement particles, a concrete superplasticizer component, water, and optionally and preferably filler particles. The pipe is then spun to centrifugally cast a stronger, denser pipe liner than a comparable liner containing no superplasticizer.
Claims58
A method for preparing a hydraulic cementitious composition, said method comprising:
- mixing solid particles comprising greater than 50 dry weight percent of hydraulic cement with a superplasticizer and water to form a slurry and wherein said solid particles consist essentially of particles of cross-sectional dimension greater than 1 micron;
- and
- settling said solid particles contained in said slurry under a G-Force greater than 1 to produce a resultant compacted composition of said solid particles containing sufficient water to fully hydrate said cement.
A method for enhancing the compactibility of a cement-containing composition, said method comprising:
- (1) mixing a solid component and a liquid component to form an aqueous hydraulic cement slurry, said solid component comprising (a) greater than 50 dry weight percent of a hydraulic cement consisting essentially of particles of average cross-sectional dimension of at least about 1 micron, and (b) a filler material consisting essentially of particles of average cross-sectional dimension at least about 1 micron, said liquid component comprising water and a superplasticizer;
- (2) applying said aqueous hydraulic cement slurry to the interior surface of a substrate capable of being rotated about at least one axis;
- and
- (3) centrifugally spinning said solid component of the applied slurry of (2) at a G-Force greater than 1.0 to form a cement-containing liner for said substrate, said liner containing sufficient water to fully hydrate said cement.
A method for producing a solid element protecting an interior surface of a duct from an aqueous fluid contained within said duct, said solid element produced from a mixture of a solid component and a liquid component, said solid component containing at least 50 weight percent of particles of an inorganic Type-K cement and further containing particles of an inorganic filler comprising silica flour wherein said particles of said cement and said filler consist essentially of particles of average cross-sectional dimension greater than 1 micron, and said liquid component containing water and a superplasticizer compound, said method comprising the following steps:
- (1) mixing of said liquid component and said solid components at ambient temperature;
- (2) applying the mixed components from step (1) to said interior surface of said duct;
- (3) centrifugally spinning said duct at an average G-Force greater than 10 to produce a resultant cementitious composition until said components have at least partially formed a semi-solid shape of said solid element;
- and
- (4) curing said resultant cementitious composition to produce a cured resultant cementitious composition containing sufficient water to fully hydrate said cement.
A hydraulic cement slurry composition comprising (1) a solid component having greater than 50 dry weight percent of a non-compactible hydraulic cement and (2) sufficient water to fully hydrate said cement, and (3) at least one superplasticizer compound.
A slurry composition comprising a non-compactible hydraulic cement/filler slurry comprising hydraulic cement particles, filler particles and sufficient water to fully hydrate said hydraulic cement particles, said composition further comprising at least one superplasticizer compound, wherein said hydraulic cement particles and said filler particles consist essentially of particles of average cross-sectional dimension at least about 1 micron and said hydraulic cement particles comprising greater than 50 dry weight percent of the total hydraulic cement and filler particles.
A cementitious composition comprising:
- (1) homogeneously arranged, fully hydrated cementitious inorganic solid particles, essentially all of which are of average cross-sectional dimension at least about 1 micron;
- (2) densely packed non-cementitious solid particles, essentially all of which are of average cross-sectional dimension at least about 1 micron;
- and
- wherein said particles of (1) and a superplasticizer compound are homogeneously distributed in the volume between said particles of (2), and said particles of (1) comprise greater than 50 dry weight percent of the total solid particles of (1) and (2).
Dependencies are inferred from the claim text.