Direct brucite carbonation for cementation

Patent metadata

Field	Value
Publication number	US-2024059615-A1
Application number	US-202318217171-A
Country	US
Kind code	A1
Filing date	Jun 30, 2023
Priority date	Jun 30, 2022
Publication date	Feb 22, 2024
Grant date	—

Abstract

The present disclosure provides methods of preparing concrete products comprising carbonation of brucite-containing concrete. The present disclosure further provides brucite containing concrete mixtures that are useful in the present methods.

First claim

We claim:

1 . A method of preparing a concrete product, comprising:
(a) forming a concrete mixture into a desired shape; and (b) cementing and carbonating the concrete mixture through contact with a gaseous CO 2 source, wherein the concrete mixture comprises:
(i) 5-50% (w/w) of a cementitious precursor comprising:
(a) from about 20% to about 90% (w/w) of a binder comprising brucite and a cement replacement material; and
(b) from about 5% to about 80% (w/w) Ordinary Portland Cement; and

(ii) 50-95% (w/w) of a filler.

2 . The method of claim 1 , wherein the concrete mixture is cemented and carbonated at a curing temperature from about 20 to about 90° C.

3 . (canceled)

4 . The method of claim 1 , wherein the concrete mixture is cemented and carbonated at a relative humidity of between about 10 and 100%.

5 . (canceled)

6 . (canceled)

7 . The method of claim 1 , wherein the concrete mixture is cemented and carbonated at a CO 2 concentration from about 2 to about 30% (v/v).

8 . (canceled)

9 . The method of claim 1 , wherein the concrete mixture is carbonated at a carbonation pressure from about 0.01 to about 1.0 MPa.

10 . The method of claim 1 , wherein the filler comprises an aggregate material, wherein the aggregate material comprises gravel, sand, pebbles, crushed stones, crushed recycled concrete, rocks, slag, bottom ash, or any combination thereof.

11 . (canceled)

12 . The method of claim 1 , wherein the cement replacement material comprises fly ash, slag cement, recycled cement, ground steel slag, or any combination thereof.

13 . The method of claim 1 , wherein the concrete mixture further comprises an admixture, wherein the admixture comprises a water reducing admixture, a retarding admixture, an accelerating admixture, an air entraining concrete admixture, a pozzolanic admixture, a damp-proofing admixture, a gas forming admixture, an air detraining admixture, an alkali aggregate expansion admixture, an inhibiting admixture, an anti-washout admixture, a grouting admixture, a corrosion inhibiting admixture, a bonding admixture, a fungicidal admixture, a germicidal admixture, an insecticidal admixture, a coloring admixture, or any combination thereof.

14 . (canceled)

15 . The method of claim 1 , wherein the cementitious precursor comprises about 20% to about 80% (w/w) of the binder.

16 . The method of claim 1 , wherein the cementitious precursor comprises from about 60% to about 80% (w/w) brucite.

17 . The method of claim 1 , wherein the cementitious precursor comprises about 5% to about 50% (w/w) Ordinary Portland Cement.

18 . The method of claim 1 , wherein the brucite has a purity from about 30% to 100%.

19 . A concrete mixture composition comprising:
(i) 5-50% (w/w) of cementitious precursor comprising:
(a) from about 20% to about 90% (w/w) of a binder comprising brucite and a cement replacement material; and
(b) from about 5% to about 80% (w/w) Ordinary Portland Cement; and
(ii) 50-95% (w/w) of filler.

20 . The composition of claim 19 , wherein the filler comprises gravel, sand, pebbles, crushed stones, crushed recycled concrete or fill, rocks, slag, bottom ash, or any combination thereof.

21 . The composition of claim 19 , wherein the cement replacement material comprises fly ash, slag cement, recycled cement, and ground steel slag.

22 . The composition of claim 19 , further comprising an admixture, wherein the admixture comprises a water reducing admixture, a retarding admixture, an accelerating admixture, an air entraining concrete admixture, a pozzolanic admixture, a damp-proofing admixture, a gas forming admixture, an air detraining admixture, an alkali aggregate expansion admixture, an inhibiting admixture, an anti-washout admixture, a grouting admixture, a corrosion inhibiting admixture, a bonding admixture, a fungicidal admixture, a germicidal admixture, an insecticidal admixture, a coloring admixture, or any combination thereof.

23 . (canceled)

24 . The composition of claim 19 , wherein the cementitious precursor comprises about 20% to about 80% (w/w) of the binder.

25 . The composition of claim 19 , wherein the cementitious precursor comprises about 5% to about 50% (w/w) Ordinary Portland Cement.

26 . The composition of claim 19 , wherein the cementitious precursor comprises from about 60% to about 80% (w/w) brucite.

27 . The composition of claim 19 , wherein the brucite has a purity from about 30% to 100%.

Assignees

• Univ California

Inventors

• Sant Gaurav N
• Prentice Dale
• Simonetti Dante Adam
• Arabit Jenny

Classifications

• C04B2111/00019

  Carbon dioxide sequestration · CPC title

• C04B40/0231

  Carbon dioxide hardening · CPC title

• C04B28/10 Primary

  Lime cements or magnesium oxide cements · CPC title

• C04B40/0082

  making use of a rise in temperature, e.g. caused by an exothermic reaction · CPC title

• C04B40/0281

  Hardening in an atmosphere of increased relative humidity · CPC title