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US 8,177,909 B2Granted
Methods and compositions using calcium carbonate
AssigneeCalera Corporation
InventorsBrent R. Constantz, Kasra Farsad, Chris Camire, Irvin Chen, Matthew Ginder-Vogel, Miguel Fernandez
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Abstract
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.
Claims13
A method for making a composition, comprising:
- (a) contacting a solution comprising a proton removing agent with CO2 gas to form a CO2 charged water;
- (b) contacting an alkaline earth-metal containing water with the CO2 charged water;
- and
- (c) subjecting the alkaline earth-metal containing water of step (b) to one or more conditions to make a composition comprising hydraulic cement, the hydraulic cement 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,
- wherein the one or more conditions are selected from the group consisting of mixing, stirring, temperature, pH, precipitation, residence time of the precipitate, dewatering of precipitate, washing precipitate with water, ion ratio, concentration of additives, drying, milling, grinding, storing, aging, and curing.
2 more elements
Dependencies are inferred from the claim text.