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 non-naturally occurring self-cementing composition, consisting essentially of carbonate precipitate in water comprising: at least 1% w/w vaterite, wherein the composition after setting and hardening in water 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‰.
2. The composition of claim 1 , wherein the composition has a compressive strength in a range of 20-40 MPa.
3. The composition of claim 1 , wherein the vaterite is in a range of 47% w/w to 99% w/w.
4. The composition of claim 1 , wherein the composition further comprises ACC in a range of 1% w/w to 99% w/w.
5. The composition of claim 1 , further comprising 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.
6. The composition of claim 1 , further comprising a polymorph selected from the group consisting of aragonite, calcite, ikaite, and combination thereof, wherein the aragonite, calcite, ikaite, or combination thereof are independently in a range of between 1% w/w to 80% w/w.
7. The composition of claim 1 , further comprising strontium (Sr) in an amount of 1-50,000 parts per million (ppm).
8. The composition of claim 1 , wherein the composition is a particulate composition with an average particle size of 0.1-100 microns.
9. The composition of claim 1 , further comprising nitrogen oxide, sulfur oxide, mercury, metal, derivative of any of nitrogen oxide, sulfur oxide, mercury, and/or metal, or combination thereof.
10. The composition of claim 1 , wherein the composition has a zeta potential of between −25 to 45 mV.