Formulations and processing of cementitious components to meet target strength and CO

1. A manufacturing process of a low-carbon concrete product, comprising:

forming a cementitious slurry including portlandite;

shaping the cementitious slurry into a structural component; and

exposing the structural component to a post-combustion or post-calcination flue gas stream containing CO 2 ,

wherein forming the cementitious slurry includes combining water and a binder including the portlandite and optionally cement and coal combustion residuals at a water-to-binder mass ratio (w/b) of about 0.5 or less, thereby enabling manufacture of the low-carbon concrete product.

2. The manufacturing process of claim 1 , wherein the w/b is about 0.45 or less.

3. The manufacturing process of claim 1 , wherein forming the cementitious slurry includes combining water and a binder including a cement, portlandite, and coal combustion residuals, at a mass percentage of the cement in the binder from about 25% to about 50%.

4. The manufacturing process of claim 3 , wherein the mass percentage of the cement in the binder is from about 30% to about 50%.

5. The manufacturing process of claim 1 , further comprising drying the structural component prior to exposing the structural component to the post-combustion or post-calcination flue gas stream containing CO 2 .

6. The manufacturing process of claim 5 , wherein drying the structural component includes reducing a degree of pore water saturation (S W ) to less than 1.

7. The manufacturing process of claim 6 , wherein the S w is from about 0.9 or less to about 0.1.

8. The manufacturing process of claim 6 , wherein drying the structural component includes reducing the S W to within a range of about 0.1 to about 0.7.

9. The manufacturing process of claim 5 , wherein drying the structural component is performed at a temperature in a range of about 20° C. to about 85° C. for a time duration in a range of 1 h to about 72 h.

10. The manufacturing process of claim 1 , wherein a green body structural component is produced either by compacting the cementitious slurry or by pouring the slurry in to a mold to form the structural component.

11. The manufacturing process of claim 10 , wherein compacting the cementitious slurry includes reducing a degree of pore water saturation (S W ) to less than 1.

12. The manufacturing process of claim 11 , wherein the S W is from about 0.9 or less to about 0.1.

13. The manufacturing process of claim 10 , wherein compacting the cementitious slurry includes reducing the S W to within a range of about 0.1 to about 0.7.

14. The manufacturing process of claim 10 , wherein compacting the cementitious slurry is performed at a pressure in a range of about 0.5 MPa to about 50 MPa.

15. The manufacturing process of claim 1 , wherein exposing the structural component to the post-combustion or post-calcination flue gas stream containing CO 2 is performed at ambient pressure and at a temperature in a range of about 20° C. to about 80° C.

16. The manufacturing process of claim 1 , wherein the low-carbon concrete products have up to 75% lower embodied carbon intensity than a traditional cement-based concrete product.

17. The manufacturing process of claim 16 , wherein the lower carbon intensity is due to (a) partial substitution of cement with portlandite and/or fly ash and/or (b) CO 2 uptake during manufacturing.

18. The manufacturing process of claim 3 , wherein the cementitious slurry further includes alumino-silicates.

19. The manufacturing process of claim 8 , wherein drying the structural component includes reducing the Sw prior to exposing the structural component to the post-combustion or post-calcination flue gas stream containing CO 2 .

20. The manufacturing process of claim 17 , wherein the lower carbon intensity is due to partial substitution of cement with alumino-silicates.

21. A manufacturing process of a low-carbon concrete product, comprising:

providing a target compressive strength of the concrete product;

providing a prediction model relating carbon dioxide uptake to compressive strength;

forming a cementitious slurry including portlandite;

forming the cementitious slurry into a structural component; and

exposing the structural component to carbon dioxide, thereby forming the low-carbon concrete product, wherein exposing the structural component to carbon dioxide includes monitoring carbon dioxide uptake of the structural component, and exposing the structural component to carbon dioxide is performed at least until the carbon dioxide uptake of the structural component is indicative of meeting the target compressive strength according to the prediction model.

22. The manufacturing process of claim 21 , wherein the carbon dioxide is contained within a post-combustion or post-calcination flue gas stream.