A method for producing cement comprises: obtaining a first hydroxide; forming a first carbonate from the first hydroxide; forming a mixture by mixing the first carbonate, magnesium oxide and zeolite; and allowing the mixture to cure to thereby form cement.

A restoration cap unit for construction of eco-friendly structures in a body of water is provided, which is constructed from materials including a primarily calcium carbonate material; and a cement that is capable of holding the primarily calcium carbonate material, wherein the restoration cap unit has a first side and a second side which are attached at an edge to form a tent shaped structure, such that the restoration cap unit is configured to be placed on top of an existing restoration assembly to extend the height of the restoration assembly.

Cement compositions that can capture carbon dioxide and related methods are generally described. These cement compositions can supplement and/or be added to concrete-forming materials to form concrete that can sequester carbon dioxide directly within the concrete.

A method to produce a calcined mineral binder material includes the steps of: a) providing a source material including a mineral binder material, carbonating the source material with carbon dioxide such that the mineral binder material is at least partially, in particular essentially completely, carbonated to produce a carbonated product; b) calcining a carbonate-containing material to produce a calcined mineral binder material and carbon dioxide as side product; whereby in step a) the carbon dioxide side product of step b), optionally in combination with further carbon dioxide from a different source, is used as the carbon dioxide for carbonation of the source material; and in step b) the carbonate-containing material includes the carbonated product of step a), and optionally other material.

A method of preparing a high-performance green building material based on combustion flue gas carbon dioxide mineralization, including: calculating a raw material ratio; taking each industrial solid waste material to obtain a solid powder; pouring the solid powder, dihydrate gypsum and gel material into a granulator, mixing uniformly, and then taking a part of the mixture, and then stirring the remaining mixture with deionized water sprayed until spherical kernels are formed, uniformly adding the previously-taken part of mixture to prepare an aggregate; performing hydration reaction on the aggregate; drying the hydrated aggregate to prepare spherical ceramic granules; placing the ceramic granules into a reaction kettle and introducing a combustion flue gas containing CO.sub.2 for mineralization reaction, and taking out reacted ceramic granules and putting into drying oven for drying to prepare a cold-bonded lightweight aggregate; supplementing water to the lightweight aggregate to perform hydration reaction and obtain a finished product.

A method of producing a carbonate bonded article includes preparing a reactive mixture having a particulate mineral source and an aqueous source, and reacting the reactive mixture with carbon dioxide to form a mineral matrix including carbonates. The particulate mineral source includes a leachable compound, the leachable compound including one or more elements selected from: As, Ba, Cd, Cr, Co, Cu, F, Hg, Mo, Mn, Ni, Pb, Sb, Se, V, and Zn. The reactive mixture includes a reducing agent, where the reducing agent includes one or more of a sulfide, disulfide, and polysulfide compound that reacts with the particulate mineral source. The pH of the reactive mixture is at least 10.

Improved cement for concrete is provided having reduced carbon footprint and improved mechanical properties. A limestone-free process of making the clinker provides a 70% reduction of carbon footprint vs. conventional manufacture of Portland cement. Curing the resulting cement in a temperature range from 80 C. to 100 C. advantageously enhances growth of fibrous minerals in the concrete.

A method of manufacturing environmentally friendly interior and exterior building materials, includes: preparing agricultural waste of a lignocellulose-containing herbaceous plant; and subjecting the agricultural waste to immersion treatment using a functional immersion solution prepared by mixing purified water, an organic acid or an alkali salt thereof, and a composite natural extract and stirring the mixture.

A carbon dioxide immobilization method includes: impregnating a cured cement body (10) with a carbon dioxide absorbing liquid containing a carbon dioxide absorbent (20) to obtain a cured cement body (1) for carbon dioxide immobilization, in which the carbon dioxide absorbent (20) is supported within the cured cement body (10); and bringing the cured cement body (1) for carbon dioxide immobilization into contact with air to immobilize carbon dioxide contained in the air in the cured cement body (1) for carbon dioxide immobilization.

A method of forming a concrete product includes directly capturing CO.sub.2 from a gas source, the capturing comprising contacting the gas source with an absorption solution having a solvent and a solute, wherein the solvent and/or the solute are capable of reacting with CO.sub.2 to form an anionic compound, adjusting the pH of the absorption solution electrochemically to less than about 7 to release the CO.sub.2 as a concentrated vapor containing CO.sub.2, collecting the concentrated vapor containing CO.sub.2, regenerating the solvent and/or the solute, and optionally collecting the regenerated solvent and/or solute; flowing the concentrated vapor containing CO.sub.2 through a gas processing unit to adjust at least one of a temperature, a relative humidity, or a flow rate of the concentrated vapor containing CO.sub.2; and contacting the concentrated vapor containing CO.sub.2 with a concrete component.