Methods and compositions using calcium carbonate
Provided herein are compositions and methods including hydraulic cement, supplementary cementitious material, and/or self-cementing material. Methods for making the compositions and using the compositions are provided.
1. A method for making a composition, comprising:
(a) contacting a solution comprising a proton removing agent with a CO 2 gaseous stream to produce a CO 2 charged solution;
(b) contacting the CO 2 charged solution with an alkaline earth-metal containing water; and
(c) subjecting the alkaline earth-metal containing water of step (b) to one or more conditions to make a self-cementing composition wherein the self-cementing composition comprises at least 1% w/w vaterite having a carbon isotopic fractionation value (δ 13 C) of between −12‰ to −25‰, wherein the composition is in saltwater, and wherein the composition upon setting and hardening has a compressive strength of at least 14 MPa.
2. The method of claim 1 , wherein the CO 2 gaseous stream is an industrial waste stream comprising flue gas from combustion; a flue gas from a chemical processing plant; a flue gas from a plant that produces CO 2 as a byproduct; or combination thereof.
3. The method of claim 1 , wherein the alkaline earth-metal containing water is sea water, brine, or combination thereof.
4. The method of claim 1 , wherein the one or more conditions are selected from the group consisting of temperature, pH, precipitation, residence time of the precipitate, dewatering of the precipitate, washing the precipitate with water, drying, milling, and storage.
5. The method of claim 1 , wherein the composition comprises between 20% w/w to 99% w/w vaterite.
6. The method of claim 1 , wherein the proton removing agent is selected from the group consisting of oxide, hydroxide, carbonate, coal ash, naturally occurring mineral, and combination thereof.
7. The method of claim 6 , wherein the proton removing agent is hydroxide made by an electrochemical process.
8. The method of claim 1 , wherein the self-cementing composition comprises less than 90% by wt solid material.
9. The method of claim 1 , wherein the method does not require dewatering the composition.
10. The method of claim 1 , wherein the method does not require drying the composition.
11. The method of claim 1 , wherein the method further comprises pouring the composition into molds to form formed building materials.
12. The method of claim 1 , wherein the method comprises rinsing the composition with water.
13. The method of claim 1 , wherein the self-cementing composition comprises between 50% w/w to 100% w/w vaterite.
14. The method of claim 1 , wherein the alkaline earth-metal containing water comprises calcium chloride.
15. The method of claim 1 , wherein the method further comprises adding Portland cement, aggregate, supplementary cementitious material (SCM), or combination thereof, to the composition.