Methods and compositions using calcium carbonate

摘要

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.

主权项

1. A method for making a construction panel, comprising:
contacting an alkaline earth-metal containing water with a CO2 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 (δ13C) of less than −12‰, combining the composition with an aqueous medium; and allowing the composition to set and harden into a construction panel.