Classifications

• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
  • C04B18/04—Waste materials; Refuse
  • C04B18/14—Waste materials; Refuse from metallurgical processes
  • C04B18/141—Slags
  • C04B18/142—Steelmaking slags, converter slags
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
  • C04B16/02—Cellulosic materials
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
  • C04B16/04—Macromolecular compounds
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
  • C04B18/04—Waste materials; Refuse
  • C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
  • C04B18/10—Burned or pyrolised refuse
  • C04B18/101—Burned rice husks or other burned vegetable material
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
  • C04B18/04—Waste materials; Refuse
  • C04B18/18—Waste materials; Refuse organic
  • C04B18/24—Vegetable refuse, e.g. rice husks, maize-ear refuse; Cellulosic materials, e.g. paper, cork
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
  • C04B18/04—Waste materials; Refuse
  • C04B18/18—Waste materials; Refuse organic
  • C04B18/24—Vegetable refuse, e.g. rice husks, maize-ear refuse; Cellulosic materials, e.g. paper, cork
  • C04B18/26—Wood, e.g. sawdust, wood shavings
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators or shrinkage compensating agents
  • C04B22/002—Water
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators or shrinkage compensating agents
  • C04B22/06—Oxides, Hydroxides
  • C04B22/062—Oxides, Hydroxides of the alkali or alkaline-earth metals
  • C04B22/064—Oxides, Hydroxides of the alkali or alkaline-earth metals of the alkaline-earth metals
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
  • C04B28/006—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing mineral polymers, e.g. geopolymers of the Davidovits type
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
  • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
  • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
  • C04B28/08—Slag cements
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
  • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
  • C04B28/08—Slag cements
  • C04B28/082—Steelmaking slags; Converter slags
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
  • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
  • C04B28/10—Lime cements or magnesium oxide cements
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
  • C04B2111/00017—Aspects relating to the protection of the environment
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
  • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
  • C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
  • Y02C20/00—Capture or disposal of greenhouse gases
  • Y02C20/40—Capture or disposal of greenhouse gases of CO2
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
  • Y02W30/00—Technologies for solid waste management
  • Y02W30/50—Reuse, recycling or recovery technologies
  • Y02W30/91—Use of waste materials as fillers for mortars or concrete

Definitions

• the present invention relates to a solidified body, a roadbed material, and a method for manufacturing the solidified body.
• Patent Document 1 discloses a method for producing a steel slag carbonated solidified body produced using steelmaking slag and CO2 as raw materials.
• Patent Document 1 the inside of an airtight container is deaerated, and then a carbonation process is carried out for a long period of time to cause a carbonation reaction in the uncarbonated Ca-containing raw material of the preform by supplying carbon dioxide gas, which causes a problem of a very large load. Furthermore, there is also a problem that it is difficult to carbonate the entire inside of the solidified body.
• the present invention has been made in consideration of such problems, and its purpose is to provide a solidified body that can fix CO2 without performing a deaeration process or a carbonation process in an airtight container, a roadbed material containing the solidified body, and a method for manufacturing the solidified body.
• a solidified body comprising a binder, at least one of carbonated steelmaking slag, wood material, synthetic resin, and natural fiber, and water, wherein the content of the at least one of the carbonated steelmaking slag, wood material, synthetic resin, and natural fiber is 1% by mass or more and 90% by mass or less.
• the carbonated steelmaking slag is a carbonated steelmaking slag fine powder having a particle size of 1 mm or less, and the carbonate content of the carbonated steelmaking slag fine powder is 1 mass% or more.
• the wood material includes at least one of semi-carbonized material and carbonized material,
• the solidified body according to [1] or [2], wherein the content of at least one of the semi-carbonized material and the carbide contained in the wood material is 1 mass% or more.
• the ground steelmaking slag is at least one of converter slag, secondary refining slag, hot metal pretreatment slag, and electric furnace slag.
• the vitreous aluminosilicate is at least one of fly ash, volcanic ash, and silica fume.
• a method for producing a solidified body comprising: a kneading step of kneading a binder, at least one of carbonated steelmaking slag, wood material, synthetic resin and natural fibers, and water to form a mixture; and a solidification step of shaping and solidifying the mixture, wherein in the kneading step, the carbonated steelmaking slag, wood material, synthetic resin and natural fibers are mixed and kneaded so that the content of at least one of the carbonated steelmaking slag, wood material, synthetic resin and natural fibers is 1 mass% or more and 90 mass% or less.
• a solidified body is produced by solidifying a binder and a raw material capable of fixing carbon with a hydrate, so the solidified body according to the present invention is capable of fixing CO2 in an airtight container without a degassing process or a carbonation process.
• a method for producing a solidified body according to the first embodiment will be described.
• a binder which is a raw material for the solidified body, carbonated steelmaking slag, and water are kneaded to form a mixture.
• This process is the kneading step.
• the mixture of the binder, carbonated steelmaking slag, and water is formed into a predetermined shape and cured in air, a humid atmosphere, or water for at least one day to solidify by a hydration reaction.
• This process is the solidification step.
• the produced solidified body is used, for example, as a seawall material, a foot protection material, a fishing reef, a wall material, a sand compaction pile material, a calcia modifier, a roadbed material, and an aggregate.
• the binder is a material that has the function of binding particles together and solidifying them through a hydration reaction.
• the binder is, for example, at least one of the following: ground granulated blast furnace slag, ground granulated steel slag, vitreous aluminosilicate, hydrated lime, cement, and waste concrete.
• the particle size of the ground granulated blast furnace slag and ground granulated steel slag may be 1 mm or less.
• a particle size of 1 mm or less means a particle size that can be sieved through a sieve with 1 mm mesh.
• the binder is mixed so that the binder content in the solidified body is 10% by mass or more and 99% by mass or less.
• the finely powdered steelmaking slag used as the binder is, for example, at least one of converter slag, secondary refining slag, hot metal pretreatment slag, and electric furnace slag.
• the vitreous aluminosilicate used as the binder is, for example, at least one of fly ash, volcanic ash, and silica fume. An example of the composition of these components is shown in Table 1 below.
• the water is, for example, at least one of fresh water, salt water, sea water, hot spring water, and sodium hydroxide aqueous solution. It is sufficient if the water contains moisture, but by using salt water or sea water containing chloride ions, or hot spring water containing sulfate ions, thiosulfate ions, and chloride ions, or a sodium hydroxide aqueous solution containing high pH sodium ions, the strength of the mixture obtained by kneading is promoted, and the strength of the solidified body is improved. By using hot spring water containing carbonate ions, the amount of CO2 fixed by the solidified body is increased. Table 2 below shows an example of the components contained in these waters.
• the water-binder ratio which indicates the mass ratio of water to binder during kneading (mass of water/mass of binder), is preferably 0.1 or more and 0.7 or less. If the water-binder ratio during kneading is less than 0.1, the fluidity of the mixture obtained in the kneading step decreases, which is not preferable. On the other hand, if the water-binder ratio during kneading is greater than 0.7, it is not preferable because the time required to improve the strength of the solidified body in the solidification step increases or the strength of the solidified body decreases.
• Carbonated steelmaking slag is mixed so that the content of the carbonated steelmaking slag in the solidified body is 1% by mass or more and 90% by mass or less. If the content of the carbonated steelmaking slag is less than 1% by mass, the amount of CO2 fixed in the solidified body is small, which is not preferable. On the other hand, if the content of the carbonated steelmaking slag is more than 90% by mass, the amount of binding material is reduced, and the strength of the solidified body is reduced, which is not preferable. Carbonated steelmaking slag can be produced by adding steam to the steelmaking slag, introducing a CO2- containing gas, and performing a carbonation treatment for one day.
• carbonated steelmaking slag may be produced by holding the steelmaking slag in water, introducing a CO2- containing gas into the water, and performing a carbonation treatment for one day.
• the CO2 concentration of the introduced CO2- containing gas may be 10% by volume or more.
• the CO2- containing gas may be exhaust gas with a CO2 concentration of 10% by volume or more discharged from a manufacturing process facility in a steelworks.
• the steel slag used for the carbonated steel slag is preferably finely ground steel slag having a particle size of 1 mm or less.
• a particle size of 1 mm or less means a particle size that can be sieved through a sieve with 1 mm mesh.
• Carbonated steelmaking slag contains carbonate.
• the carbonate may be, for example, calcium carbonate, calcium carbonate hydrate, magnesium carbonate, or magnesium carbonate hydrate. It is preferable to carbonate steelmaking slag so that the carbonate content in the carbonated steelmaking slag is 1 mass% or more. Carbonate contains CO2 , so a large amount of carbonate means that the corresponding amount of CO2 is fixed in the solidified body. Therefore, by using carbonated steelmaking slag with a carbonate content of 1 mass% or more as a raw material for the solidified body, the amount of CO2 fixed in the solidified body increases. Since the higher the carbonate content in the carbonated steelmaking slag, the more CO2 is fixed in the solidified body, so there is no need to set an upper limit for the carbonate content.
• the solidified body according to the first embodiment can be manufactured by solidifying the binder and carbonated steelmaking slag with a hydrate, so that the solidified body can be manufactured without carrying out a degassing process or a carbonation process in an airtight container. Furthermore, while calcium carbonate and biochar, which are CO2 fixing materials, generate residues of components other than Ca and ash components, the solidified body manufactured using carbonated steelmaking slag can suppress the generation of such residues.
• Embodiment 2 a solidified body containing a binder, a wood material, and water will be described as embodiment 2.
• the binder and water are the same as those in embodiment 1, so the description thereof will be omitted.
• a method for producing a solidified body according to the second embodiment will be described.
• a binder which is the raw material for the solidified body, wood material crushed to 4.75 mm or less, and water are kneaded to form a mixture.
• This process is the kneading step.
• Wood material of 4.75 mm or less is wood material that is sieved under a sieve with a mesh size of 4.75 mm among the crushed wood material.
• the mixture of the binder, wood material, and water is molded into a predetermined shape, and cured in air, a humid atmosphere, or water for one day or more, and solidified by hydration reaction.
• This process is the solidification step.
• the wood material is mixed so that the content of the wood material in the solidified body is 1% by mass or more and 90% by mass or less.
• the wood material is, for example, one of wood powder, wood chips, wood wool, wood fiber, pulp, semi-carbonized material, carbonized material, cellulose nanofiber, carbon nanofiber, and carbon fiber.
• the low specific gravity solidified body is used as a revetment material, an exterior wall material, and a floating fish reef. By using the low specific gravity solidified body, construction becomes easier, so that the construction period of revetment construction and exterior wall construction can be shortened.
• Wood materials are highly water absorbent. For this reason, by using wood materials as the raw material for the solidified body, heat generation during the hydration reaction in the solidification step is suppressed, and the occurrence of cracks in the solidified body produced can be suppressed. Furthermore, by using wood materials as the raw material for the solidified body, drying shrinkage of the solidified body is also suppressed, so a solidified body with excellent thermal insulation, soundproofing, and fire resistance, as well as moisture regulating effects and excellent biocompatibility can be produced.
• the wood material preferably contains at least one of semi-carbonized materials and charcoal.
• Semi-carbonized materials and charcoal function as adsorbents, and therefore adsorb the lye contained in low-cost wood materials, which causes a delay in solidification of the solidified body. Therefore, by using wood materials containing semi-carbonized materials and charcoal, it becomes possible to manufacture solidified bodies using low-cost wood materials.
• Semi-carbonized materials can be manufactured by heating wood materials in an oxygen-free or low-oxygen reducing atmosphere at 200°C or higher and lower than 300°C.
• Charcoalized materials can be manufactured by heating wood materials in an oxygen-free or low-oxygen reducing atmosphere at 300°C or higher and 1000°C or lower.
• the content of at least one of the semi-carbides and carbides contained in the wood material is preferably 1% by mass or more. If the content of at least one of the semi-carbides and carbides is less than 1% by mass, the effect of inhibiting solidification delay cannot be obtained, and it becomes impossible to use low-cost wood materials. On the other hand, the higher the content of semi-carbides and carbides, the greater the effect of inhibiting solidification delay. For this reason, there is no need to set an upper limit for the content of semi-carbides and carbides.
• a solidified body in which CO2 is fixed can be produced by using a wood material instead of carbonated steelmaking slag.
• the solidified body according to the second embodiment can also be produced by solidifying a binder and a wood material with a hydrate, so that the solidified body can be produced without carrying out a degassing process or a carbonation process in an airtight container.
• Embodiment 3 A solidified body containing a binder, a synthetic resin, and water will be described as embodiment 3.
• the binder and water are the same as those in embodiment 1, and therefore the description thereof will be omitted.
• the binder which is the raw material for the solidified body, synthetic resin crushed to 4.75 mm or less, and water are kneaded together to form a mixture.
• This process is the kneading step.
• Synthetic resin of 4.75 mm or less is synthetic resin that can be sieved through a sieve with 4.75 mm mesh among the crushed synthetic resins.
• the kneaded mixture of binder, synthetic resin, and water is molded into a predetermined shape and cured in air, a humid atmosphere, or water for at least one day to solidify through a hydration reaction.
• This process is the solidification step. By solidifying the raw materials through a hydration reaction in this manner, the solidified body according to embodiment 3 can be manufactured.
• Synthetic resin is mixed so that the synthetic resin content in the solidified body is 1% by mass or more and 90% by mass or less.
• the synthetic resin is, for example, one of the following solid synthetic polymer compounds: synthetic rubber waste, waste tires, polystyrene foam waste, polyvinyl chloride waste, polyethylene waste, polystyrene waste, and synthetic fiber waste. It is preferable to use waste plastics such as polystyrene foam waste, polyvinyl chloride waste, polyethylene waste, polystyrene waste, and synthetic fiber waste as the synthetic resin.
• synthetic resin By using synthetic resin as the raw material for the solidified body, the insulating properties of the solidified body are improved. Furthermore, it becomes possible to manufacture lightweight solidified bodies and solidified bodies with elasticity.
• a solidified body in which CO2 is fixed can be manufactured by using synthetic resin instead of carbonated steelmaking slag.
• the solidified body according to the third embodiment can also be manufactured by solidifying a binder and a synthetic resin with a hydrate, so that the solidified body can be manufactured without carrying out a degassing process or a carbonation process in an airtight container.
• Embodiment 4 A solidified body containing a binder, natural fibers, and water will be described as embodiment 4.
• the binder and water are the same as those in embodiment 1, and therefore the description thereof will be omitted.
• the binder which is the raw material for the solidified body, the natural fibers cut to 4.75 mm or less, and water are kneaded together to form a mixture. This process is the kneading step. Next, the mixture of the binder, natural fibers, and water is formed into a predetermined shape and cured in air, a humid atmosphere, or under water for at least one day to solidify through a hydration reaction. This process is the solidification step. By solidifying the raw materials through a hydration reaction in this manner, the solidified body of embodiment 4 can be manufactured.
• Natural fibers are mixed so that the natural fiber content in the solidified body is 1% by mass or more and 90% by mass or less. Natural fibers are, for example, plant fibers such as cotton, hemp, linen, rice husks, palm kernel shells, and banana peels, or animal fibers such as wool, cashmere, and silk. By using natural fibers as the raw material for the solidified body, the strength of the solidified body is improved. Furthermore, it becomes possible to manufacture lightweight solidified bodies and solidified bodies with elasticity.
• a solidified body in which CO2 is fixed can be manufactured by using natural fibers instead of carbonated steelmaking slag.
• the solidified body according to the fourth embodiment can also be manufactured by solidifying a binder and natural fibers with a hydrate, so that the solidified body can be manufactured without carrying out a degassing process or a carbonation process in an airtight container.
• the solidified body is described as including a binder, carbonated steelmaking slag, a wood material, a synthetic resin or natural fiber, and water, but the present invention is not limited to this.
• a solidified body may be manufactured using a wood material together with carbonated steelmaking slag, a synthetic resin together with carbonated steelmaking slag, or a natural fiber together with carbonated steelmaking slag.
• a solidified body may be manufactured using a wood material together with synthetic resin, a natural fiber together with carbonated steelmaking slag, or a natural fiber together with synthetic resin.
• the solidified body according to the present embodiment includes a binder, at least one of carbonated steelmaking slag, a wood material, a synthetic resin, and a natural fiber, and water, and has a content of at least one of carbonated steelmaking slag, a wood material, a synthetic resin, and a natural fiber of 1% by mass or more and 90% by mass or less.
• the solidified body may contain a binder, carbonated steelmaking slag, wood material, synthetic resin or natural fiber, water, and fine aggregate, or may contain a binder, carbonated steelmaking slag, wood material, synthetic resin or natural fiber, water, fine aggregate, and coarse aggregate. Even with such a solidified body, it is possible to produce a solidified body with fixed CO2 without performing a degassing process or a carbonation process in an airtight container.
• CO2 is fixed in the roadbed material.
• at least one of carbonated steel slag, wood material, synthetic resin, and natural fiber may be mixed into the roadbed material.
• a solidified body was manufactured by adjusting the mixing ratio of the binder, carbonated steel slag (containing calcium carbonate, which is a carbonate), wood material, synthetic resin, natural fiber, and water.
• Carbonated fine powder of steel slag with a particle size of 1 mm or less was used as the carbonated steel slag.
• the wood material and synthetic resin were crushed to 4.75 mm or less using a crusher, and the natural fiber was cut to 4.75 mm or less using a cutter mill.
• the mixing ratio of these raw materials, the water binding ratio, the presence or absence of solidification, and the amount of CO2 fixed are shown in Table 3 below.
• the binder, fine powder of carbonated steel slag, wood material, synthetic resin, and natural fiber used in each of the invention examples 1 to 17 and the comparative examples 1 to 4 are shown in Table 4 below.
• the semi-carbonized material contained in the wood material was produced by treating wood flour with an average particle size of 1 mm at 250°C for 10 minutes using superheated steam.
• the carbonized material contained in the wood material was produced by treating wood flour with an average particle size of 300 ⁇ m at 300°C for 20 minutes using superheated steam.
• the average particle size of wood flour is the volume average diameter defined by the following formula (1).
• x i is the representative particle size (mm) of the particle size interval
• n i is the number of particles.
• the compressive strength of the solidified body produced was 1 MPa or more, the solidification was judged as “Good”, and if the compressive strength of the solidified body was less than 1 MPa, the solidification was judged as "Poor”.
• the compressive strength of the solidified body was measured in accordance with JIS A 1108:2018 "Test method for compressive strength of concrete".

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• 2023
  • 2023-11-14 KR KR1020257025146A patent/KR20250128361A/ko active Pending
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