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 - 21 . (canceled)
22 . 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 composition comprising a non-naturally occurring supplementary cementitious material (SCM), the SCM comprising at least 47% w/w vaterite, wherein the composition upon combination with water, setting, and hardening, has a compressive strength of at least 14 MPa and wherein the composition comprises a carbon isotopic fractionation value (δ 13 C) of between −12‰ to −25‰.
23 . The method of claim 22 , 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.
24 . The method of claim 22 , wherein the alkaline earth-metal containing water is sea water, brine, or combination thereof.
25 . The method of claim 22 , 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.
26 . The method of claim 22 , wherein the supplementary cementitious material comprises between 50% w/w to 100% w/w vaterite.
27 . The method of claim 22 , wherein the proton removing agent is selected from the group consisting of oxide, hydroxide, carbonate, coal ash, naturally occurring mineral, and combination thereof.
28 . The method of claim 22 , wherein the proton removing agent is hydroxide made by an electrochemical process.
29 - 40 . (canceled)
41 . The method of claim 22 , wherein the alkaline earth-metal containing water comprises calcium chloride.
42 . The method of claim 22 , wherein the method further comprises adding Portland cement, aggregate, other supplementary cementitious material (SCM), or combination thereof, to the composition.
43 . The method of claim 22 , wherein the composition upon combination with water, setting, and hardening has a compressive strength of between 14-100 MPa.
44 . The method of claim 22 , wherein the composition further comprises a polymorph selected from the group consisting of amorphous calcium carbonate, aragonite, calcite, ikaite, a precursor phase of vaterite, a precursor phase of aragonite, an intermediary phase that is less stable than calcite, polymorphic forms in between these polymorphs, and combination thereof.
45 . The method of claim 22 , wherein the method further comprises dewatering the composition.
46 . The method of claim 22 , wherein the method further comprises drying the composition.
47 . The method of claim 22 , wherein the method further comprises grinding, milling, or combination thereof, the composition.