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 for synthesizing metakaolin-based alkali-activated composites with improved fresh and mechanical properties over previous methods. This can be achieved, for example, by employing waste from the steel production industry, i.e., the metakaolin in the composites can be replaced by electric-arc furnace dust (EAFD) at high replacement levels (up to 90%). The replacement by EAFD (1-90%) can elongate the setting time, improve the mix flowability/workability, enhance the compressive strength, reduce the water to binder content and/or alkaline solution needed for the binder activation of alkali-activated composites. Additionally, another embodiment relates to a procedure for producing alkali-activated composites with 100% EAFD. In addition to solving issues related to the manufacturing of metakaolin-based alkali-activated composites, or similar composites thereof, the present subject matter provides a way to dispose of hazardous EAFD in large quantities.

A building material includes bio-oil treated plastic and biochar adhered to an exterior surface of the bio-oil treated plastic Capturing metals from mine tailings includes combining the building material, mine tailings, and an alkaline activator to yield a mixture, and polymerizing the mixture to yield a geopolymer.

Methods, systems and compositions for storing carbon dioxide in soil are disclosed herein. In some embodiments, the composition comprises at least 35% of cement by weight of the composition; 1-15% of lime by weight of the composition; at least 5% of a supplementary cementitious material (SCM) by weight of the composition; and carbon dioxide, wherein a weight by composition of the carbon dioxide is less than 5%. The composition can further comprise at least 35% of calcium carbonate by weight of the composition.

A method for manufacturing cement clinker includes the steps: preheating a raw meal in a first preheater using kiln off-gas to provide a partially preheated raw meal, preheating the partially preheated raw meal in a second preheater to provide preheated raw meal, precalcination of the pre-heated raw meal in a calciner being a circulating fluidized bed reactor by burning fuel with oxygen and recirculated calciner exhaust gas instead of air to provide a precalcined raw meal wherein at least 2 mbar overpressure are adjusted in the calciner, transferring the precalcined raw meal to a rotary kiln for sintering to provide the cement clinker, cooling the cement clinker, and capturing carbon dioxide from a calciner exhaust gas in a carbon dioxide purification unit.

Systems, methods, and memorial items including cremated remains are shown and described. The memorial item may be an environmentally safe item. A system for preserving cremated remains may include altering a pH of a slurry containing cremated remains.

A concrete composition that incorporates carbon black sequestered from CO2.

In embodiments, the present disclosure is directed to cementitious materials and structures made therefrom. The cementitious materials may comprise precipitated calcium carbonate, such as one derived from an organic source. In embodiments, the present disclosure relates to submerged concrete structures comprising the cementitious material previously described.

Described herein are novel construction materials and construction material compositions, processes, and equipment for manufacturing press-formed biocement and bioconcrete products and construction materials. In some embodiments, the methods include combining aggregate particles with a first measured dose of at least one biological organism or enzyme and a first measured dose of cementation reagents in a first mixer, mixing the contents of the first mixer and reacting the first measured dose of the cementation reagents in the presence of the first measured dose of the at least one biological organism or enzyme to form a biocement which binds to the surfaces of the aggregate particles, thereby increasing the size of the particles to yield a biocement coated aggregate.

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.