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US 5,554,352 AGranted
Processed silica as a natural pozzolan for use as a cementitious component in concrete and concrete products
AssigneeConstruction Material Resources
InventorsStephen B. Jaques, Richard D. Stehly, Peter B. Dunning
Life of this patent
Estimating the term…
Abstract
A pozzolan for use in concrete products which is a silica by-product in the acid treatment of silica-containing ore is described. The pozzolan contains over 75% by weight amorphous silica and provides an increase in the early strength of concrete in comparison to traditional pozzolans as well as minimizing alkali-silica reactions due to the presence of less impurities.
Claims14
A method of making a natural pozzolan comprising:
- digesting bauxite ore with sulfuric acid to obtain a silica slurry;
- allowing the silica slurry to settle to produce a silica product and liquid;
- decanting the liquid from the silica product;
- washing the silica product at least one time;
- drying and thereafter grinding the silica product wherein said silica product comprises from about 75% to 95% by weight of amorphous silica and acts as a natural pozzolan.
2 more elements
A concrete product comprising:
- from about 50% to about 70% by weight Portland cement;
- and
- from about 30 to about 50% by weight of a natural pozzolan containing at least 90% by weight processed amorphous silica and no more than 10% by weight alumina, wherein the natural pozzolan is a by-product obtained from sulfuric acid treatment of bauxite ore in a process comprising the steps of:
- a) digesting bauxite ore with sulfuric acid to obtain a silica slurry;
- b) allowing the silica slurry to settle to produce a silica product and liquid;
- c) decanting the liquid from the silica product;
- d) washing the silica product at least one time;
- e) drying and thereafter grinding the silica product.
5 more elements
A method of making a natural pozzolan comprising:
- digesting bauxite ore with about 93% sulfuric acid to obtain a silica and alumina-containing slurry;
- allowing the slurry to settle to produce a silica/alumina product and liquid;
- decanting the liquid from the silica/alumina product;
- washing the silica/alumina product at least one time;
- and
- drying and thereafter grinding the silica/alumina product.
3 more elements
A method making a natural pozzolan consisting essentially of:
- digesting bauxite ore with sulfuric acid to obtain a silica slurry;
- allowing the silica slurry to settle to produce a silica product and liquid;
- decanting the liquid from the silica product;
- washing the silica product at least one time;
- drying and thereafter grinding the silica product wherein said silica product comprises from about 75% to 95% by weight of amorphous silica and acts as a natural pozzolan.
2 more elements
Dependencies are inferred from the claim text.