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 construction panel, comprising:
contacting an alkaline earth-metal containing water with a CO 2 source;
subjecting the alkaline earth-metal containing water to one or more conditions comprising temperature, pH, precipitation, ion ratio, concentrations of additives and ionic species, mixing rate, form of agitation, presence of seed crystal, catalyst, membrane or substrate, stabilizing additives, residence time of the precipitate, dewatering of the precipitate, washing the precipitate with water, drying, milling, storage, or combinations thereof to make a composition, wherein the composition comprises at least 10% w/w vaterite and at least 1% w/w aragonite, wherein the composition has a carbon isotopic fractionation value (δ 13 C) of less than −12‰,
combining the composition with an aqueous medium; and
allowing the composition to set and harden into a construction panel.
2. The method of claim 1 , wherein the aqueous medium comprises fresh water optionally comprising sodium chloride, calcium chloride, magnesium chloride, or combinations thereof.
3. The method of claim 1 , wherein the combining the composition with the aqueous medium transforms vaterite to aragonite.
4. The method of claim 1 , wherein the CO 2 source 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 combinations thereof.
5. The method of claim 1 , wherein the alkaline earth-metal containing water is brackish water, sea water, subterranean brine, or combinations thereof.
6. The method of claim 1 , further comprising drying the composition after making the composition to produce a dry composition.
7. The method of claim 1 , wherein the composition is combined with aqueous medium to produce a slurry mixture which is poured into molds to form the construction panel.
8. The method of claim 1 , wherein the construction panel is cement board, fiber-cement siding, drywall, or combinations thereof.
9. The method of claim 8 , comprising making the cement board that has a flexural strength of between 1-7.5 MPa, compressive strength of between 5-50 MPa, or both.
10. The method of claim 8 , comprising making the drywall that has a flexural strength of between 0.1-3 MPa, compressive strength of between 1-20 MPa, or both.
11. The method of claim 8 , comprising making the fiber-cement siding that has a flexural strength of between 0.5-5 MPa, compressive strength of between 2-25 MPa, or both.
12. The method of claim 1 , further comprising adding fiberglass, dispersed glass fibers, plasticizer, foaming agent, accelerator, retarder, air entrainment additive, or combinations thereof, to the composition to make the construction panel.
13. The method of claim 1 , wherein the composition has an average particle size of between 0.1-100 microns.