Patent ID: 7735274

Claim:
A settable composition comprising a hydraulic cement composition, wherein the hydraulic cement composition is a dry particulate composition comprising particles having an average particle size of 0.1 to 100 microns, and wherein the hydraulic cement composition comprises a carbonate compound composition comprising carbon from a gaseous source of carbon dioxide, wherein the carbonate compound composition comprises a metastable carbonate compound characterized by being more stable in salt water than in fresh water, wherein the metastable carbonate comprises crystalline aragonite, and optionally vaterite or amorphous calcium carbonate or combinations thereof, and wherein strontium is present in the carbonate composition in an amount ranging from 3 to 10,000 ppm, wherein the strontium is present in the crystal lattice of the aragonite, wherein sodium is present in the carbonate composition in an amount less than 20,000 ppm, and wherein the settable composition, upon combination with water and setting and hardening, has a compressive strength of 20-70 MPa.