Disclosed is a method for backfilling and reconstructing a carbon storage space in an abandoned main roadway and storing CO.sub.2. A surrounding rock of the main roadway is surveyed through geophysical exploration technology, and an anchor bolts (anchor cables) are used to reinforce and support an area which has unstable confining pressure bearing. According to a width and a height of the roadway section of the main roadway, a support formwork is forged in advance, and after the support formwork is placed in the main roadway, backfilling slurry is injected to the periphery of the support formwork. Meanwhile, supercritical carbon dioxide is injected into the backfilling slurry and the roadway, respectively.

A composite plastering material and a method of making the same are provided. The composite plastering material includes a mixture of sand-silica and Abelmoschus esculentus powder. The composite plastering material has increased compressive strength depending upon the concentration of Abelmoschus esculentus powder used. The method of making the composite plastering material includes sieving the sand-silica to produce sand-silica of a uniform particle size, mixing powdered Abelmoschus esculentus powder with the sand-silica to produce a first mixture, and mixing water with the first mixture to produce the composite plastering material. Optionally, the method may also include milling the sand-silica prior to sieving and combining the sand-silica with the Abelmoschus esculentus powder. The composite plastering material may then be plaster cast, such as by pressing the composite plastering material in a hot press and drying the resulting composite material in an oven.

A carbon-sequestering concrete composition and method of production are disclosed. The composition comprises geopolymer binder components, aggregates, and alginate beads formed from brown algae powder through ionic gelation. The alginate beads significantly increase CO2 absorption surface area compared to algae powder, creating a matrix across the concrete surface that enhances long-term sequestration and improves durability. The beads interact synergistically with other concrete components, including geopolymers, fly ash, and ground granulated blast furnace slag, to enhance pozzolanic reactions and create additional sites for carbon dioxide capture. The alginate beads also facilitate the dissolution of minerals like olivine, further enhancing carbon capture. The composition demonstrates superior carbon sequestration capabilities, enabling sustained CO2 absorption throughout its service life. The method includes forming alginate beads, incorporating them into the concrete mixture, and allowing for initial hardening and drying processes that promote carbon dioxide absorption directly from the air.

A preparation method of a supplementary cementitious material based on electrostatic adsorption for high-efficiency CO.sub.2 sequestration is provided. The preparation method of the present disclosure includes the following steps: placing ultrafine carbide slag powder into an electrostatic field to make the ultrafine carbide slag powder have electrostatic charge, and obtaining ultrafine carbide slag powder with electrostatic charge; and uniformly mixing low-calcium fly ash and the ultrafine calcium carbide slag powder with electrostatic charge, followed by adding into a rotary packed bed; continuously introducing industrial waste gas containing CO.sub.2 and water vapor into the rotary packed bed; after a reaction, collecting a material and drying to obtain the supplementary cementitious material based on electrostatic adsorption for high-efficiency CO.sub.2 sequestration.

A method for preparing a silane coupling agent/silica/plant fiber composite includes the following steps: S1: pretreating plant fiber; S2: preparing hydrolysate of a silane coupling agent; S3: preparing a silane coupling agent/plant fiber composite; S4: preparing a silica nanoparticle dispersion; and S5: preparing a silane coupling agent/silica nanoparticle/plant fiber composite. Through the covalent interaction among a silanol group (SiOH) formed by hydrolysis of the silane coupling agent, SiOH of the silica, and a hydroxyl group (OH) on the surface of the plant fiber, the present invention enables silica nanoparticles to be grafted on the surface of the plant fiber. Using a hydrophobic film formed by the silane coupling agent, harmful ions are prevented from invading, and the volume stability of the fiber is improved. Using the pozzolanic activity of the silica nanoparticles, the alkalinity and calcium hydroxide content around the fiber are reduced.

Embodiments provide a novel concrete composition and method for forming a geopolymer-based building material. The composition comprises a geopolymer binder, water-retentive aggregates with long-term water retention properties and biological surface growth facilitation, where at least one aggregate is cellulose pre-treated with a saturating coating solution. The composition also includes rigid, porous aeration aggregates and strength aggregates. The method involves mixing these components to form a pourable building material, which is then poured and cured under controlled conditions to create a durable, cured building material. Embodiments include a geopolymer-based construction material comprising an aluminosilicate precursor, an activator, biopolymer-coated water-retentive aggregates, and a porosity agent. Said geopolymer-based construction material retains water above 10% by weight with a pH below 8.0, offering enhanced sustainability, biological compatibility, and durability in construction applications.

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.

System and method of low carbon emission production of cement include a conventional kiln, a precipitation reactor in material communications with the conventional kiln, an indirect heated kiln in material communications with the precipitation reactor, and a sequestration module in material communications with the indirect heated kiln and configured to sequester high purity carbon dioxide produced by the indirect heated kiln. The system may further comprise a compressor, in material communications with the indirect heated kiln and the sequestration module and the precipitation reactor, and configured to produce materialized carbon dioxide.

A restoration unit for construction of eco-friendly structures in a body of water comprising a cementitious material, wherein the restoration unit is in the form of a slab having one or more openings. The restoration unit is configured such that the restoration unit can be placed on a support unit to form a restoration assembly module having a shape selected from (i) a substantially right-angled triangular prism shape with the restoration unit at an angle, wherein the ends of the substantially right-angled triangular prism shape are open or (ii) a symmetrical or asymmetrical triangle, having one side formed from the support unit and two sides formed from the restoration units, with the ends of the substantially right-angled triangular prism shape being open, wherein the restoration assembly is configured to attenuate waves.

An aqueous carbonation curing method of a binder composition according to an exemplary embodiment of the present invention includes: forming a binder composition; curing the binder composition in a negative pressure state (pre-curing step); water curing the pre-cured binder composition in an aqueous carbon dioxide absorbent solution (first curing step); and curing the first-cured binder composition in a 95% or more relative humidity atmosphere (second curing step).