Enhanced carbonation and carbon sequestration in cementitious binders

Patent metadata

Field	Value
Publication number	US-2017226021-A1
Application number	US-201515519524-A
Country	US
Kind code	A1
Filing date	Oct 14, 2015
Priority date	Oct 15, 2014
Publication date	Aug 10, 2017
Grant date	—

Abstract

A manufacturing process of a cement product includes: (a) reacting at least one anhydrous or hydrated cement component with liquid or supercritical CO 2 to form a cement composition; and (b) curing the cement composition to form a cement product.

First claim

1 . A manufacturing process of a cement product, comprising:
(a) conditioning at least one cement component in an atmosphere with a relative humidity greater than 8%; and (b) reacting the at least one cement component with CO 2 to form a cement product.

2 . The manufacturing process of claim 1 , wherein the at least one cement component includes at least one of portlandite, tricalcium silicate, dicalcium silicate, or calcium silicate hydrate.

3 . The manufacturing process of claim 1 , wherein the at least one cement component includes at least one of magnesium hydroxide or magnesium silicate.

4 . The manufacturing process of claim 1 , wherein the at least one cement component includes at least two different cement components.

5 . The manufacturing process of claim 1 , wherein the reacting in (b) includes:
forming calcium carbonate; or forming magnesium carbonate.

6 . The manufacturing process of claim 5 , wherein the cement product includes an amount of calcium carbonate or magnesium carbonate that is at least 3% by mass.

7 . The manufacturing process of claim 1 , wherein the reacting in (b) is carried out at a temperature in a range of 0° C. to 60° C.

8 . The manufacturing process of claim 1 , wherein the reacting in (b) is carried out at a pressure at or above 0.51 MPa.

9 . The manufacturing process of claim 1 , wherein the conditioning in (a) is carried out with the relative humidity of 30% or greater, prior to the reacting in (b).

10 . A manufacturing process of a cement product, comprising:
(a) combining at least one cement component with aggregates; (b) shaping the at least one cement component and the aggregates to form a structural element; and (c) exposing the structural element to CO 2 to form a cement product.

11 . The manufacturing process of claim 10 , wherein the at least one cement component includes portlandite or calcium silicate hydrate.

12 . The manufacturing process of claim 10 , wherein the at least one cement component is ordinary portland cement, a calcium sulfoaluminate cement, or a calcium aluminate cement.

13 . The manufacturing process of claim 10 , wherein the at least one cement component includes magnesium hydroxide or magnesium silicate.

14 . The manufacturing process of claim 10 , wherein the exposing in (c) is carried out at a temperature in a range of 0° C. to 60° C., and a pressure in a range of 0.51 MPa to 20 MPa.

15 . The manufacturing process of claim 10 , wherein the exposing in (c) includes converting the at least one cement component to calcium carbonate or magnesium carbonate.

16 . The manufacturing process of claim 15 , wherein a mass basis percentage of the at least one cement component converted to calcium carbonate or magnesium carbonate is at least 10% within a reaction time period of 6 h.

17 . A manufacturing process, comprising:
(a) disposing a reactant in a reactor, wherein the reactant includes portlandite, and a water content of the reactant is no greater than 25% by mass; (b) introducing CO 2 into the reactor; and (c) exposing the reactant to the CO 2 for a reaction time period to form calcium carbonate.

18 . The manufacturing process of claim 17 , wherein the water content of the reactant is no greater than 20% by mass.

19 . The manufacturing process of claim 17 , wherein the reactant is in a monolithic form.

20 . The manufacturing process of claim 17 , wherein a mass basis percentage of the reactant converted to calcium carbonate is at least 10% within the reaction time period of 6 h.

21 . (canceled)

22 . The manufacturing process of claim 10 , wherein the shaping in (b) includes forming channels in the structural element.

23 . The manufacturing process of claim 10 , further comprising conditioning the structural element in an atmosphere with a relative humidity greater than 8%, prior to the exposing in (c).

Assignees

• Univ California

Inventors

• Sant Gaurav
• Vance Kirk E
• Balonis Magdalena

Classifications

• C04B28/065

  Calcium aluminosulfate cements, e.g. cements hydrating into ettringite · CPC title

• C04B28/105

  Magnesium oxide or magnesium carbonate cements · CPC title

• C04B28/06

  Aluminous cements (monolithic refractories or refractory mortars C04B35/66) · CPC title

• B28B11/245

  Curing concrete articles (B28B11/242 takes precedence) · CPC title

• Y02P40/18

  Carbon capture and storage [CCS] · CPC title