Product comprising cement and supplementary cementitious material, and methods of making

Patent metadata

Field	Value
Publication number	US-12195398-B2
Application number	US-202017425352-A
Country	US
Kind code	B2
Filing date	Jan 23, 2020
Priority date	Jan 24, 2019
Publication date	Jan 14, 2025
Grant date	Jan 14, 2025

Abstract

A cement product including a supplementary cementitious material (SCM) including natural aluminosilicate, and optionally metakaolin, and methods of producing the cement product, and methods of use thereof are provided. The natural aluminosilicate may have, for example, a d97 less than or equal to about 19 μm; and may have a d10 less than or equal to about 2 μm. The product may also have improved chloride permeability as compared to cement products including natural aluminosilicates having higher d97 and d10 values. Also, the product may also have improved compressive strength and RCPT values when a portion of the natural aluminosilicate in the SCM is replaced with metakaolin.

First claim

What is claimed is:

1. A product comprising a cement and a supplementary cementitious material comprising a natural aluminosilicate and a metakaolin, wherein the natural aluminosilicate has a d97 less than or equal to about 19 μm; wherein the metakaolin has a d50 between about 0.1 μm and about 5.5 μm, and wherein the natural aluminosilicate is present in the supplementary cementitious material in an amount of at least about 50 wt %.

2. The product according to claim 1 , wherein the natural aluminosilicate is selected from perlite, diatomaceous earth, pumice and combinations thereof,
the natural aluminosilicate contains compounds comprising silica and alumina present in an aluminosilicate matrix; and
greater than or equal to about 75 wt % or greater than of the aluminosilicate matrix is in an amorphous state.

3. The product according to claim 1 wherein the weight ratio of silica to alumina of the natural aluminosilicate is less than or equal to about 6.

4. The product according to claim 1 wherein the natural aluminosilicate has a d50 less than or equal to about 6.5 μm and has a d90 less than or equal to about 17 μm.

5. The product according to claim 1 , wherein the natural aluminosilicate has a d97 greater than or equal to about 2 μm.

6. The product according to claim 1 , wherein the natural aluminosilicate has a d50 greater than or equal to about 0.5 μm.

7. The product according to claim 1 , wherein the supplementary cementitious material is present in the product in an amount of at least about 5 wt %, and the supplementary cementitious material is present in the product in an amount equal to or lower than about 35 wt %, based on the total weight of the product.

8. A method of producing a cured cement-containing product by admixing a supplementary cementitious material comprising a natural aluminosilicate and metakaolin with a cement and water to form an intermediate mixture and allowing the intermediate mixture to cure forming the cured cement-containing product;
wherein the natural aluminosilicate has a d97 less than or equal to about 19 μm;
wherein the metakaolin has a d50 between about 0.1 μm and about 5.5 μm, and
wherein the natural aluminosilicate is present in the supplementary cementitious material in an amount of at least about 50 wt %.

9. The method according to claim 8 , wherein the chloride permeability of the cured cement-containing product after 28 days of accelerated curing as described in ASTM C1202 is less than or equal to about 800 coulombs, as measured according to ASTM C1202; or
wherein the chloride permeability of the cured cement-containing product after 56 days of aging is less than or equal to about 1100 coulombs, as measured according to ASTM C1202.

10. The method according to claim 8 , wherein the cured cement-containing product has a compressive strength of at least 80% of the compressive strength of a comparative cured product not including the natural aluminosilicate, as measured according to ASTM C39 measured using cylindrical specimens.

11. The method according to claim 8 , wherein the supplementary cementitious material is present in the cured product in an amount of at least about 5 wt %, and in an amount equal to or lower than about 35 wt %, based on the total weight of the cured cement-containing product.

12. The method according to claim 8 , wherein the intermediate mixture further comprises an aggregate.

Assignees

• Imertech Sas

Inventors

• Dedeloudis Christos
• Kotinis Dionysios
• Salem Bassam
• Kapralou Christina

Classifications

• C04B2111/21

  Efflorescence resistance · CPC title

• C04B28/04 Primary

  Portland cements · CPC title

• C04B7/13 Primary

  Mixtures thereof with inorganic cementitious materials, e.g. Portland cements · CPC title