WO2015068704A1 - 繊維補強炭酸化水硬性無機質成形板及びその製造方法 - Google Patents

繊維補強炭酸化水硬性無機質成形板及びその製造方法 Download PDF

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WO2015068704A1
WO2015068704A1 PCT/JP2014/079278 JP2014079278W WO2015068704A1 WO 2015068704 A1 WO2015068704 A1 WO 2015068704A1 JP 2014079278 W JP2014079278 W JP 2014079278W WO 2015068704 A1 WO2015068704 A1 WO 2015068704A1
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Prior art keywords
fiber
curing
molded plate
inorganic molded
hydraulic inorganic
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PCT/JP2014/079278
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English (en)
French (fr)
Japanese (ja)
Inventor
人見祥徳
稲田真也
岩崎嘉宏
乗竹宏明
羽田三郎
盛岡実
樋口隆行
庄司慎
入内島克明
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株式会社クラレ
電気化学工業株式会社
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Application filed by 株式会社クラレ, 電気化学工業株式会社 filed Critical 株式会社クラレ
Priority to ES14859513T priority Critical patent/ES2857511T3/es
Priority to BR112016009971-0A priority patent/BR112016009971B1/pt
Priority to EP14859513.5A priority patent/EP3067337B1/en
Priority to JP2015546650A priority patent/JP6609474B2/ja
Priority to MX2016005719A priority patent/MX2016005719A/es
Publication of WO2015068704A1 publication Critical patent/WO2015068704A1/ja
Priority to US15/145,502 priority patent/US10093577B2/en

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    • 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
    • C04B16/06—Macromolecular compounds fibrous
    • C04B16/0616—Macromolecular compounds fibrous from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C04B16/0641—Polyvinylalcohols; Polyvinylacetates
    • 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
    • C04B28/025—Belite 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
    • C04B28/04—Portland 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
    • C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/02—Selection of the hardening environment
    • C04B40/0231—Carbon dioxide hardening
    • 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
    • C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/02—Selection of the hardening environment
    • C04B40/0231—Carbon dioxide hardening
    • C04B40/0236—Carbon dioxide post-treatment of already hardened 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
    • 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
    • C04B2111/00586—Roofing 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
    • 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
    • C04B2111/00612—Uses not provided for elsewhere in C04B2111/00 as one or more layers of a layered structure
    • C04B2111/0062—Gypsum-paper board like materials
    • 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 is a fiber-reinforced carbonated hydraulic inorganic molded board that is suitably used as a building material such as a roofing material and a wall material, has a high bulk specific gravity and excellent bending strength, and has a small dimensional change rate per specific gravity, and its production Regarding the method.
  • Patent Document 1 discloses that when a hardened cement body having a high belite content is placed in an atmosphere of high carbon dioxide gas concentration, a hardened body having excellent carbon dioxide gas permeability and high bending strength can be obtained by carbonation.
  • Patent Document 2 discloses a cement composition for a carbonized hardened body containing a binder containing a polymer admixture, ⁇ -belite ( ⁇ -2CaO ⁇ SiO 2 ), and cement.
  • Patent Document 2 discloses a cemented concrete composition for a carbonized cured body used for a large plate material used for a relatively large building, for example, a panel material such as curtain wall or ALC, and a method for producing the same. Yes.
  • Patent Document 3 primary curing is performed, demolding is performed after the formation of calcium hydroxide accompanying the hydration reaction, and after the acceleration period when the hydration reaction of cement alite (C 3 S) is activated. Curing is carried out in a carbon dioxide gas atmosphere for a period from a deceleration period in which a large amount of calcium hydroxide crystals are generated in the cured body to a steady period in which the cured body becomes dense.
  • Patent Document 4 pursues “sound absorption” and “heat insulation” by incorporating a parameter “permeability” into a porous structure in curing a hydraulic inorganic molding composition.
  • Patent Document 5 discloses an invention relating to a fiber suitable for improving the explosion resistance of an irregular refractory and an irregular refractory to which the fiber is added. It discloses that the air permeability is effective in improving the explosion resistance of the irregular refractory.
  • Patent Document 1 in manufacturing a concrete product, although the improvement of bending strength is recognized by carbonating a cement hardening body, the dimension stability formed by adding a pulp and a reinforcement fiber to cement is calculated
  • Patent Document 2 it is said that the polymer admixture is preferably used as an organic polymer carbonation accelerator, but is formed by adding pulp and reinforcing fibers to cement, and has hydraulic properties that require dimensional stability.
  • Patent Document 3 describes carbon dioxide diffusion in detail, but there is no suggestion regarding a fiber-reinforced carbonated inorganic molded plate that is formed by adding both pulp and reinforcing fibers to cement and that requires dimensional stability.
  • Patent Document 4 the relationship between the air permeability and the porosity in the inorganic porous material is studied, but there is no suggestion about the relationship between the air permeability and carbonation.
  • Patent Document 5 the air permeability is a problem in relation to the explosion suppression effect in the amorphous refractory, but there is no suggestion about the relation between the air permeability and carbonation.
  • the present inventors have a high bulk specific gravity and a dimensional change rate under high bending strength, unlike ordinary concrete products. Therefore, it is said that it is a problem to be solved to obtain a fiber-reinforced hydraulic inorganic molded plate having a high bulk specific gravity, a high bending strength, and a small dimensional change rate.
  • the first configuration of the present invention is a fiber-reinforced carbonated hydraulic inorganic molded plate containing at least a cement component, pulp and reinforcing fibers, The aspect ratio of the reinforcing fiber is in the range of 40 to 1000, and the molding plate is a carbon-cured and fiber-reinforced carbonated hydraulic inorganic molding plate.
  • the molded plate preferably has a dimensional change rate per specific gravity of 0.1% or less.
  • the dimensional change rate per specific gravity is a value obtained by dividing the dimensional change rate measured according to JIS A5430 by the bulk specific gravity.
  • the reinforcing fiber is preferably a polyvinyl alcohol fiber.
  • the present inventors have recognized that carbonation proceeds to the inner layer of the plate-shaped molded body by performing carbonation with the air permeability of the molded body after pre-curing being a certain value or more, and the second configuration of the present invention.
  • the invention according to the present invention has been reached.
  • the second configuration of the present invention (second product invention) is a molded plate obtained by curing a composition containing at least a cement component, pulp and reinforcing fibers, and the carbonation reaction rate of the molded plate is 30% or more.
  • a fiber-reinforced carbonated hydraulic inorganic molded board characterized by the following.
  • being carbonated means that a phenolphthalein aqueous solution was applied to a cross-section obtained by vertically splitting the molded plate and did not develop a red color. Since the molded plate cured by carbonation shifts from high alkalinity to neutral side, the uncarbonated part is colored bright red, but the carbonated part is not clearly colored and can be detected it can.
  • the carbonation reaction rate is preferably 50% or more.
  • the dimensional change rate per specific gravity is preferably 0.1% or less.
  • the cement component is preferably a cement containing 18% by mass or more of belite, and the reaction rate of belite is preferably 70% or more.
  • the reinforcing fiber is preferably a polyvinyl alcohol fiber.
  • the third configuration of the present invention (the first manufacturing method invention) relates to a manufacturing method for manufacturing the product according to the first configuration, and is at least in the range of cement component, pulp, and aspect ratio of 40 to 1000.
  • Production of a fiber-reinforced carbonated hydraulic inorganic molded board characterized by pre-curing a composition composed of reinforcing fibers and water, followed by carbonation curing to obtain a fiber-reinforced carbonated hydraulic inorganic molded board It is a method to do.
  • a composition containing cement containing 18% by mass or more of belite as the cement component is molded, and at least reaches a demoldable hardness, and then is carbonized. It is preferable to do.
  • the pre-curing is preferably performed in an atmosphere having a humidity of 60 to 100%.
  • the carbonation curing is preferably performed in an atmosphere containing 5 to 30% carbon dioxide gas.
  • a fourth configuration of the present invention is an invention relating to a manufacturing method for manufacturing a product according to the second configuration, and is a composition composed of at least a cement component, pulp, reinforcing fibers, and water.
  • the present invention is a fiber-reinforced carbonated hydraulic inorganic molded plate containing at least a cement component, pulp, and reinforcing fibers, and the aspect ratio of the reinforcing fibers is 40 to 1000 Within the range, the molded plate is carbonized and cured and has a densified structure. Therefore, the bulk density and water permeability resistance are high, and the paintability is excellent. In addition, since the bending strength is high due to carbonation and the dimensional change rate per specific gravity is small, the obtained fiber-reinforced carbonated hydraulic inorganic molded plate is suitably used as a building material such as a roofing material or a wall material.
  • the carbonation curing is performed, and the carbonation reaction rate is 30% or more, that is, the carbonization is performed up to the inside of the molded plate.
  • the carbonation reaction rate is 30% or more, that is, the carbonization is performed up to the inside of the molded plate.
  • first manufacturing method invention after pre-curing (primary curing) a composition composed of at least a cement component, pulp, reinforcing fibers, and water, carbonation curing (secondary curing) I do.
  • primary curing a composition composed of at least a cement component, pulp, reinforcing fibers, and water
  • carbonation curing secondary curing
  • the time is shortened to about 1 to 3 days, and a dense hardened body can be obtained in a short time.
  • the air permeability of a molded body obtained by pre-curing a composition comprising a cement component, pulp, reinforcing fiber, and water is 0.1 ⁇ 10 ⁇ 15.
  • the carbonation reaction rate of the molded body is 30% or more, the bulk specific gravity is high, the bending strength is high, and the specific gravity per specific gravity It becomes possible to produce a fiber-reinforced carbonated hydraulic inorganic molded plate having a small dimensional change rate and effective as a building material such as a roofing material and a wall material.
  • the fiber-reinforced carbonated hydraulic inorganic molded plate according to the present invention comprises the following two inventions: the invention according to the first configuration (first product invention) and the invention according to the second configuration (second product invention).
  • First product invention a fiber-reinforced carbonated hydraulic inorganic molded board containing at least a cement component, pulp and reinforcing fibers, wherein the aspect ratio of the reinforcing fibers is in the range of 40 to 1000, and the molded board is carbonated A cured fiber reinforced carbonated hydraulic inorganic molded board.
  • the dimensional change rate per specific gravity of the fiber reinforced carbonated hydraulic inorganic molded plate subjected to carbonation curing is 0.1% or less.
  • the molded plate for example, one having a bulk specific gravity of 1.6 or more and / or a bending strength of 20 N / mm 2 or more is obtained.
  • Second product invention A molded plate in which a composition containing at least a cement component, pulp and reinforcing fibers is cured, wherein the molded plate has a carbonation reaction rate of 30% or more, and is a fiber-reinforced carbonated hydraulic inorganic molded plate It is.
  • the manufacturing method of the fiber-reinforced carbonated hydraulic inorganic molded plate according to the present invention includes the following two inventions: an invention according to the third configuration (first manufacturing method invention) and an invention according to the fourth configuration (second manufacturing method invention) Consists of.
  • Invention of the first manufacturing method (corresponding to the invention of the first product): After pre-curing a composition composed of at least a cement component, pulp, reinforcing fibers having an aspect ratio in the range of 40 to 1000 and water, carbonation curing is performed.
  • molding board which obtains a fiber reinforced carbonated hydraulic inorganic shaping
  • the air permeability is 0.1 ⁇ 10 ⁇ 15 m 2 by pre-curing a composition comprising at least a cement component, pulp, reinforcing fiber and water. Obtaining the above molded body; A step of carbonating and curing the obtained molded body, and a carbonation reaction rate of 30% or more; It is a method for producing a fiber-reinforced carbonated hydraulic inorganic molded plate having In the following description, unless otherwise specified, the description is applicable to any product invention of the first product invention and the second product invention and / or any manufacturing invention of the first manufacturing method invention and the second manufacturing method invention. is there.
  • the fiber-reinforced carbonated hydraulic inorganic molded plate of the present invention is obtained by pre-curing and then carbonating-curing a composition comprising at least a cement component, pulp, reinforcing fibers, and water.
  • the hydraulic inorganic molded plate means a plate formed by mixing at least a cement component, pulp, and reinforcing fibers with water and then casting, dehydrating, or extruding from the obtained composition.
  • the thickness is about 2 to 100 mm, preferably about 3 to 90 mm.
  • the shape of the plate includes not only a flat shape but also a curved surface shape, and the plate may have a step, an unevenness, and a corrugation as long as it has the above thickness.
  • the molded board which concerns on 2nd product invention is a molded board which the said composition hardened
  • the carbonation reaction rate of the said molded board is 30% or more, It is characterized by the above-mentioned.
  • a molded body a molded body having an air permeability of 0.1 ⁇ 10 ⁇ 15 m 2 or more was obtained from the composition, and then the obtained molded body was carbonized and cured, so that the carbonation reaction rate was 30. % Or more (second manufacturing method invention).
  • cement component examples include various Portland cements such as ordinary cement, early-strength cement, and ultra-early-strength cement. Further, various mixed cements, medium-heated cements, alumina cements, etc., in which blast furnace slag, fly ash or silica is blended with these Portland cements.
  • a typical cement alite: 3CaO ⁇ SiO 2 (composition formula C 3 S), belite: 2CaO ⁇ SiO 2 (composition formula C 2 S), aluminate Al 2 O 3 (composition formula C 3 A), Ferrite: Cement minerals such as 4CaO.Al 2 O 3 .Fe 2 O 3 (composition formula C 4 AF) are included.
  • Belite is a kind of dicalcium silicate containing CaO and SiO 2 as main components, and there are ⁇ -type, ⁇ ′-type, ⁇ -type, and ⁇ -type, each having different crystal structure and density. Of these, ⁇ -type, ⁇ ′-type and ⁇ -type react with water and exhibit hydraulic properties. However, the ⁇ type does not exhibit hydraulic properties and has the property of reacting with carbon dioxide. Ordinary cements such as Portland cement basically contain almost no ⁇ type belite ( ⁇ belite). Since the cement component in the present invention is carbonized after pre-curing, a commercially available belite cement or a cement obtained by mixing belite cement with various cements may be used.
  • the cement component has a belite content of 18 to 60% by mass, preferably 20 to 58% by mass. If the content is too small, the amount of belite that can undergo a carbonation reaction is too small, so that the densification effect is insufficient, and dimensional stability and water resistance cannot be expected. On the other hand, if the content is too large, carbonation is possible, but there are cases where sufficient bending strength cannot be obtained because the hydraulic component serving as a binder decreases.
  • the reaction rate of belite is preferably 70% or more.
  • belite also undergoes a hydration reaction, it produces a C—S—H gel similar to alite and is effective as a binder.
  • belite has a slower hydration reaction than alite, At such timing, the reaction rate is still low and the binder effect is insufficient.
  • the reaction rate is preferably 75% or more, more preferably 80% or more.
  • the pulp added as a hydraulic inorganic molded plate to the composition in the present invention may be either natural or synthetic.
  • Natural pulp is mainly unbleached and bleached pulp from conifers and hardwoods, but pulps obtained from straw, bamboo, cotton, hemp, ramie, kozo, mitsu or eucalyptus can also be used.
  • recovered waste paper obtained from newspapers, paper bags, cardboard boxes and the like can also be used.
  • synthetic pulp polyolefin pulp, polyaramid pulp, or the like can be used, and any fibrillar substance having a similar shape to these may be used. Of these, bleached pulp from conifers and hardwoods is preferred.
  • the pulp may be beaten in advance with a beater such as a refiner or beater.
  • the freeness is preferably 30 to 750 ml, more preferably 50 to 300 ml as Canadian freeness.
  • the pulp content may be 1 to 10% by mass, preferably 2 to 6% by mass, based on the solids in the composition. If the content is too small, the trapping property of the particulate matter is lowered, and if the content is too large, not only the dispersion uniformity is insufficient, but also delamination is induced or the flame retardancy is impaired. Absent.
  • the reinforcing fibers added to give strength and toughness to the hydraulic inorganic molded plate include alkali-resistant glass fibers, carbon fibers, stainless fibers, ceramic fibers, asbestos fibers and other inorganic fibers, and cellulose-based fibers. Examples thereof include recycled fibers such as fibers, and organic fibers such as synthetic resin fibers. In these, an organic fiber, especially a synthetic resin fiber are preferable from a viewpoint of weight reduction.
  • synthetic resin fibers include polyolefin fibers, polyvinyl alcohol fibers, polyamide fibers, aramid fibers, polyester fibers, acrylonitrile fibers, and polyurethane fibers.
  • polyvinyl alcohol fibers are preferable from the viewpoint of alkali resistance, mechanical strength, and adhesiveness of cement.
  • the aspect ratio of the reinforcing fiber used in the first product invention of the present invention is required to be in the range of 40 to 1000, preferably 50 to 900.
  • the aspect ratio of the reinforcing fiber used in the second product invention of the present invention is preferably in the above range. If the aspect ratio is too small, the adhesive strength of the fibers to the cement becomes insufficient, and the toughness imparting effect may not be sufficient for the hydraulic inorganic molded plate after curing.
  • the reinforcing fibers preferably used in the first product invention and the second product invention of the present invention preferably have a fiber diameter of 1 to 200 ⁇ m and a fiber length of 3 to 20 mm. If the fiber diameter is less than 1 ⁇ m, uniform dispersion may be difficult. If the fiber diameter exceeds 200 ⁇ m, the number of fibers per unit volume in the cured hydraulic inorganic molded plate decreases, and the reinforcing effect tends to be difficult to be exhibited. .
  • the ratio of the reinforcing fiber to the solid content in the composition may be 0.1 to 5.0% by mass, preferably 0.3 to 4.5% by mass. If the proportion of the reinforcing fiber is less than 0.1% by mass, the fiber reinforcing effect is not sufficient in the cured hydraulic inorganic molded plate. If it exceeds 5.0% by mass, uniform dispersion tends to be difficult at the time of blending. .
  • Papermaking means that a slurry in which a cement component or the like is suspended in an aqueous medium is filtered and molded into a mesh.
  • a papermaking body means the molded object (molded board) shape
  • the composition containing the cement component in the present invention may contain various aggregates as necessary.
  • aggregates include fine aggregates, lightweight aggregates, and coarse aggregates. Can be mentioned. These aggregates may be used alone or in combination of two or more.
  • the fine aggregate include fine particles having a particle size of 5 mm or less. For example, river sand, mountain sand, sea sand, crushed sand, quartz sand, mineral sand, glass sand, iron sand, ash sand, silica fume, calcium carbonate, Examples include sands such as artificial sand.
  • Lightweight aggregates include natural lightweight aggregates such as volcanic gravel, expanded slag, charcoal pattern, artificial lightweight aggregates such as foamed pearlite, foamed perlite, foamed black stone, vermiculite, shirasu balloon, fly ash microballoon, etc. Is mentioned.
  • Coarse aggregates include those containing particles having a particle size of 5 mm or more in a mass of 85% or more. For example, various gravels, artificial aggregates, recycled aggregates, and the like can be used.
  • composition containing the cement component in the present invention various admixtures, for example, an AE agent, a fluidizing agent, a water reducing agent, a high performance water reducing agent, an AE water reducing agent, a high performance AE water reducing agent, as necessary.
  • Thickeners, water retention materials, water repellents, swelling agents, curing accelerators, setting retarders, and the like may be mixed therein.
  • These admixtures may be used alone or in combination of two or more.
  • a water-soluble polymer substance may be added to the composition of the present invention.
  • the water-soluble polymer include cellulose ethers such as methylcellulose, hydroxymethylcellulose, hydroxyethylcellulose, carboxymethylcellulose, and hydroxypropylmethylcellulose, polyvinyl alcohol, polyacrylic acid, and lignin sulfonate. These may be used alone or in combination of two or more.
  • the hardening accelerator of a hydraulic component may be added to the composition in this invention as needed.
  • the curing accelerator include calcium chloride, aluminum chloride, iron chloride, sodium chloride, magnesium chloride, alkali sulfate, alkali carbonate, and sodium silicate.
  • a carbonation accelerator may be added to the composition in the present invention as necessary.
  • the carbonation accelerator include water-based polymer dispersions, thermoplastic emulsions such as polyacrylic acid esters, polyvinyl acetate, and ethylene-vinyl acetate copolymers, and synthetic rubber latexes such as styrene-butadiene rubber.
  • the re-emulsifying powder resin include ethylene-vinyl acetate copolymer and vinyl acetate vinyl versatate (VAVeoVa).
  • cellulose derivatives such as methylcellulose, polyvinyl alcohol, etc. are mentioned, for example.
  • medical agent with high affinity with a carbon dioxide gas may be added.
  • the high affinity drug include amine drugs such as monoethanolamine, diethanolamine, and triethanolamine, and gels on which they are fixed, without particular limitation. In addition, you may use these individually or in combination of 2 or more types.
  • the water contained in the composition in the present invention may be, for example, about 20 to 80% by mass, preferably 25 to 70% by mass, and more preferably 30 to 60% by water cement ratio (W / C). % Mass may also be used.
  • the above cement component, pulp, reinforcing fiber and water are mixed by a mixing means such as a known or conventional mixer to form a composition.
  • a mixing means such as a known or conventional mixer to form a composition.
  • other cement components after mixing pulp and water and dispersing the pulp in water.
  • the mixing order is not particularly limited.
  • the pulp and water are mixed, and after the pulp is dispersed in water, the cement component and other additives are added and mixed, and finally the reinforcing fiber is added. It is preferable to add.
  • the slurry-like composition prepared as described above is fed into a plurality of pads of a wet papermaking machine, and is made into a cake on the cylinder surface by rotation of a mesh cylinder of internal negative pressure in the pad. Then, it is transported to the making roll, and is separated from the winding roll to a predetermined thickness by being single layered or laminated.
  • the separated plate-like molded product in a wet state is pressure-molded with a press if necessary, then cured (pre-curing and carbonation curing), and then dried as necessary to obtain a desired hydraulic inorganic molded plate. Is manufactured. As mentioned above, the case of using the Hatschek paper machine has been described.
  • the present invention is not limited to this, and a long web paper-making method such as further paper-making, or cast molding, press molding, extrusion molding or slurry is used.
  • the present invention can also be applied to a flow-on method for obtaining a desired thickness that is one or several times.
  • the pre-curing (primary curing) in the present invention is preferably performed to such an extent that the entire composition molded body molded into a predetermined shape is cured. If the whole is not cured, not only the molded body may be damaged at the time of handling to deplate and demold and move to the subsequent process, but also an increase in mass due to CaCO 3 generated by carbonation described later (that is, an increase in volume) ), The molded body is entangled and expands, so that the densification effect which is one of the most important points of the present invention does not appear, which is not preferable.
  • the pre-curing is preferably performed at least in a high-humidity atmosphere where water in the composition does not evaporate.
  • Hardening is due to the hydration reaction (condensation reaction) of the cement.
  • the moisture in the molded body evaporates, the hydration reaction of the cement is inhibited, and thereafter the hardening may not proceed until the molded body can be handled.
  • curing is performed in an atmosphere having a relative humidity of 65% or more, preferably 80% or more, more preferably 90% or more, and most preferably 100%.
  • moisture in the composition such as a method of putting the composition into a container or bag that does not allow moisture to pass, or sandwiching the composition between a plastic plate, a plastic film, or a metal plate, etc. Curing may be performed in such a way as to prevent evaporation.
  • the curing curing temperature is not particularly limited. What is necessary is just to perform an autoclave process in order to obtain 100 degreeC or more. In addition, when using a polyvinyl alcohol-type fiber as a reinforcing fiber, the process of 120 degreeC or more is not preferable from the viewpoint of the heat-and-moisture resistance of the fiber.
  • the maturity necessary for curing (curing temperature ° C x curing time hr) is preferably 300 to 2000.
  • the curing atmosphere gas is not particularly limited, and other than air, a gas such as carbon dioxide, nitrogen, oxygen, water vapor, helium, or argon having a concentration lower than that in the carbonation curing does not impair the object of the present invention. It can be used by mixing within the range.
  • the air permeability of the molded body after pre-curing is the above-mentioned value (0.1 by increasing the pulp content in the composition, partially using lightweight aggregate, adjusting the press pressure, etc., for example. ⁇ 10 ⁇ 15 m 2 or more), more preferably (0.2 ⁇ 10 ⁇ 15 m 2 or more), and more preferably (0.3 ⁇ 10 ⁇ 15 m 2 or more). It is preferred to carbonize the body.
  • carbonation curing (secondary curing) is performed on a composition in which the entire molded body has been cured to the extent that it can be removed from the mold by pre-curing (hereinafter sometimes referred to as a cured body).
  • the carbonation of the cement hardened body is a reaction between calcium hydroxide: Ca (OH) 2 generated by the hydration reaction of cement and [see the following formula (1)], and carbon dioxide gas that has permeated: CO 2.
  • the reaction becomes calcium carbonate: CaCO 3 and water.
  • carbonation is not promoted, which is not preferable.
  • a gas other than the carbon dioxide gas such as air, nitrogen, oxygen, water vapor, helium, or argon can be mixed and used within a range that does not impair the object of the present invention.
  • Carbonation in a carbon dioxide high-pressure vessel is also effective in terms of productivity.
  • the temperature of carbonation is not particularly limited, but the higher the temperature, the better the carbonation reaction.
  • the humidity is constant even during carbonation curing. If the humidity is too high, the surface of the molded body is covered with condensed water, and not only carbon dioxide does not enter the interior of the molded body, but also the surface of the molded body is eroded and the appearance of the product may be deteriorated. . On the other hand, if the humidity is too low, the carbonation reaction and cement hydration reaction are suppressed, which is not preferable. Therefore, the secondary curing is preferably performed in an atmosphere with a relative humidity of 30 to 95%, preferably 35 to 90%, more preferably 40 to 85%.
  • the cured product having the entire molded body cured by the pre-curing is formed by the carbonation curing so that the carbonization reaction proceeds not only to the surface of the cured body but also to the inside, so that the cured molded body does not expand. It becomes possible to densify the whole body uniformly.
  • the mechanism by which the hardened cement containing belite is densified with carbon dioxide it is considered as follows. That is, when a normal cement hardened body is carbonated (neutralized), Ca (OH) 2 generated by the cement hydration reaction reacts with carbon dioxide gas as shown in formulas (1) and (2).
  • the carbonized cured body has an increased specific gravity, a reduced water absorption, a reduced total pore volume, and a reduced dimensional change rate. It is understood that organization densification is occurring.
  • the total pore volume can be grasped from the pore distribution measurement by mercury porosimetry.
  • Vaterite has a lower specific gravity than calcite and aragonite.
  • the occupied volume is larger in the vaterite, which is effective and preferable for densification.
  • calcite is easily generated from Ca (OH) 2
  • aragonite and vaterite are easily generated from belite and C—S—H gel.
  • aragonite and vaterite effective for densification are generated at an early stage.
  • Such densification by carbonation is preferable in that densification can be performed more efficiently than a method of mechanically increasing specific gravity and reducing voids by applying a press or the like before curing.
  • the dimensional change rate is associated with expansion / contraction during water absorption / evaporation, and the rate of change can be suppressed by increasing the specific gravity.
  • the specific gravity is increased by pressing.
  • the one densified by carbonation gives a lower dimensional change rate per specific gravity.
  • the fiber-reinforced carbonated hydraulic inorganic molded plate having excellent dimensional stability such as a dimensional change rate of 0.1% or less per specific gravity, which is a preferred embodiment of the present invention, is thus carbonated and cured. You can get it.
  • Carbonation curing can be carried out without particular limitation, for example, after a pre-cured molded plate is placed in a rack or the like and introduced into a curing tank, and then cured under predetermined conditions.
  • a pre-cured molded plate is placed in a rack or the like and introduced into a curing tank, and then cured under predetermined conditions.
  • problems such as warping of the molded plate may occur. Therefore, in order to eliminate reaction spots, spacers are used to circulate the gas in the curing tank, spray carbon dioxide evenly from the top and bottom of the molding plate, and prevent the molding plates from overlapping each other when loading the molding plates on the rack. It is particularly preferable to devise so that the carbon dioxide gas can be brought into uniform contact with the molded plate, such as by providing a vertical plate or placing the molded plate vertically.
  • the air permeability is 0.1 ⁇ by pre-curing a composition composed of at least a cement component, pulp, reinforcing fiber, and water as described above.
  • the carbonation reaction rate is 30% or more, preferably 50% or more, more preferably 60% or more.
  • a molded plate can be obtained.
  • the surface of the cured body after carbonation curing may be painted as necessary.
  • the coating material is not particularly limited, such as phenol resin paint, synthetic resin blend paint, alkyd resin paint, phthalic acid resin paint, acrylic alkyd resin paint, amino alkyd resin paint, melamine baking resin paint, epoxy resin paint, Modified epoxy resin paint, tar epoxy resin paint, polyurethane resin paint, moisture curing polyurethane resin paint, acrylic urethane resin paint, polyester urethane resin paint, alkyd modified silicone resin paint, acrylic silicone resin paint, silicone resin paint, chlorinated rubber resin paint Any of vinyl acetate emulsion paint, acrylic resin paint, acrylic emulsion resin paint, NAD acrylic resin paint, vinyl chloride resin paint, fluororesin paint, lacquer paint and the like can be suitably used. Since the fiber-reinforced carbonated hydraulic inorganic molding plate according to the present invention is highly dense and neutralized, it is not necessary to select an alkali-resistant coating material that is essential for ordinary cement-based materials
  • the fiber-reinforced carbonated hydraulic inorganic molded plate according to the first product invention of the present invention obtained by the above method is carbonated after the entire cured body has been cured to the extent that it can be removed from the mold by pre-curing.
  • the densification proceeds ahead of carbonation with a fast reaction rate, so even if the hydration reaction of the hydraulic component, which has a slow reaction rate compared to carbonation, is incomplete, the bending strength can be reduced in a short period of time.
  • a fiber-reinforced carbonated hydraulic inorganic molded plate having a high dimensional change rate per specific gravity, excellent water permeability and good paintability is obtained.
  • a molded plate having a dimensional change rate per specific gravity of 0.10% or less (more preferably 0.09% or less) is obtained.
  • the fiber reinforced carbonated hydraulic inorganic molded plate according to the second product invention of the present invention obtained by the above method is obtained by pre-curing to obtain a molded article having a high air permeability, and this molded article is carbonated.
  • a fiber-reinforced carbonated hydraulic inorganic molded plate that is neutralized to the inside of the molded plate can be obtained.
  • Such a plate-like molded body has high bending strength and excellent dimensional stability due to the fact that carbonation proceeds to the inside.
  • a molded plate having a dimensional change rate per specific gravity of 0.10% or less can be obtained.
  • the fiber-reinforced carbonated hydraulic inorganic molded plate of the present invention is carbonized after pre-curing, cured to the inside of the composition of a predetermined shape by pre-curing, then densified by carbonation, and has bending strength.
  • Strong, small dimensional change rate fiber reinforced carbonated hydraulic inorganic molded plate can be obtained, such as moldings and secondary products such as slate plates, tiles, wall panels, ceiling materials, floor panels, roofing materials, partition walls, etc. It can be suitably used in the field of building materials.
  • test piece was placed in an air dryer equipped with a stirrer, and obtained from the mass and volume after drying for 24 hours at 105 ° C. ⁇ 5 ° C.
  • test piece is put in a dryer equipped with a stirrer, the temperature is kept at 60 ⁇ 3 ° C., taken out after 24 hours, put in a desiccator conditioned with silica gel, and room temperature (20 ⁇ 1. (5 ° C).
  • milky glass is attached to the test body, the marking is cut so that the distance between the markings is about 140 mm, and the length between the markings is measured with a comparator having an accuracy of 1/500 mm.
  • the base length was raised horizontally and immersed in water at 20 ° C. ⁇ 1.5 ° C. so as to be about 30 mm below the water surface.
  • the rate of change in length due to water absorption was determined by the formula: Length between marked lines when absorbing water-Length between marked lines when drying / Length between marked lines when drying x 100. Furthermore, the obtained dimensional change rate was divided by the bulk specific gravity to obtain the dimensional change rate per specific gravity.
  • the air permeability of a substance is a characteristic that allows a substance to exchange gas under a pressure difference, and the air permeability is obtained by calculating from the following formula given by the gas volume passing through the substance in a certain time.
  • V / t ⁇ * (1 / ⁇ ) * (A / ⁇ ) * (p1 ⁇ p2) * (p1 + p2) / 2P (1)
  • V amount of gas at pressure p1 that has passed through the substance (m 3 )
  • t Time required for gas amount (V) to pass through the substance (s)
  • ⁇ Air permeability of material
  • m 2 Air permeability of material
  • ⁇ Gas viscosity at the test temperature
  • A Cross-sectional area of the substance through which gas passes (m 2 )
  • ⁇ thickness of material through which gas passes (m)
  • P Absolute gas pressure (Pa) when measuring gas volume
  • p1 Gas intrusion absolute pressure (Pa)
  • p2 Absolute pressure of gas detachment from the substance (Pa)
  • the test piece was a cylinder with a diameter of 50 mm ⁇ 2 mm ⁇ height of 6 mm to 7 mm.
  • PVA fiber PVA1: Completely saponified PVA having a polymerization degree of 1700 was dissolved in water at a concentration of 16.5%, and 1.6% boric acid was added to PVA to prepare a spinning dope.
  • the spinning dope is wet-spun into a 70 ° C. coagulation bath composed of sodium hydroxide 11 g / L and bow glass 350 g / L, and after the roller drawing, neutralization, wet heat drawing, water washing and drying, the same fiber production process In the inner heat treatment step, the film was wound by dry heat drawing at 235 ° C. so that the total draw ratio was 19 times.
  • the obtained fiber had a fiber diameter of 7 ⁇ m and a fiber strength of 14.3 cN / dtex. This was cut into a fiber length of 4 mm (aspect ratio: 571).
  • Molded product In a checked product, a molded product comprising 3 parts by mass of pulp (NUKP) having a freeness of 115 ml Canadian freeness and 95.5 parts by mass of ordinary Portland cement ( ⁇ belite content: 27% by mass) 1.5 parts by mass of the cut PVA fiber was added to form a laminated papermaking plate. Thereafter, pre-curing was performed at 80 ° C. for 8 hours in an atmosphere of RH 100% in a wet heat curing tank as a pre-curing.
  • NUKP 3 parts by mass of pulp
  • pre-curing was performed at 80 ° C. for 8 hours in an atmosphere of RH 100% in a wet heat curing tank as a pre-curing.
  • Example 2 A molded body was prepared in the same manner as in Example 1 except that low heat cement ( ⁇ belite content: 50 mass%) was used as the cement. Table 1 shows the performance of the obtained molded article. Although the secondary curing period is as short as 24 hours, the bulk specific gravity is greatly densified to 1.7, the bending strength is as high as 26 N / mm 2, and the dimensional change rate per specific gravity is as low as 0.053%. Furthermore, the water permeability and paintability were good.
  • Example 3 A molded body was prepared in the same manner as in Example 1 except that special cement ( ⁇ belite content: 50% by mass) was used as the cement. Table 1 shows the performance of the obtained molded article. Although the secondary curing period is as short as 24 hours, the bulk specific gravity is greatly densified to 1.7, the bending strength is as high as 24 N / mm 2, and the dimensional change rate per specific gravity is as low as 0.041%. Furthermore, the water permeability and paintability were good.
  • Example 4 After forming a molded body in the same manner as in Example 2, the mixture was further allowed to stand for 13 days at RH 100% and 20 ° C. to advance the hydration reaction of the cement. Table 1 shows the performance of the obtained molded article. The bulk specific gravity is as large as 1.7, the flexural strength is as high as 32 N / mm 2 , the dimensional change per specific gravity is as low as 0.053%, and the water permeability and paintability are also good. It was a thing.
  • Example 5 A molded body was prepared in the same manner as in Example 1 except that 2 parts by mass of PVA2 (fiber diameter 26 ⁇ m, fiber length 6 mm, fiber strength 12 cN / dtex, aspect ratio 231) was added as a PVA fiber. Table 1 shows the performance of the obtained molded article. Although the secondary curing period is as short as 24 hours, the bulk specific gravity is greatly densified to 1.7, the bending strength is as high as 24 N / mm 2, and the dimensional change rate per specific gravity is as low as 0.059%. Furthermore, the water permeability and paintability were good.
  • Example 6 A molded body was prepared in the same manner as in Example 1 except that 3 parts by mass of PVA3 (fiber diameter 40 ⁇ m, fiber length 8 mm, fiber strength 12 cN / dtex, aspect ratio 200) was added as a PVA fiber. Table 1 shows the performance of the obtained molded article. Although the secondary curing period is as short as 24 hours, the bulk specific gravity is greatly densified to 1.7, the bending strength is as high as 25 N / mm 2, and the dimensional change rate per specific gravity is 0.065%. Further, the water permeability and paintability were good.
  • PVA3 fiber diameter 40 ⁇ m, fiber length 8 mm, fiber strength 12 cN / dtex, aspect ratio 200
  • Example 7 A molded body was prepared in the same manner as in Example 1 except that 2 parts by mass of polypropylene fiber (manufactured by Daiwabo, fiber diameter 17 ⁇ m, fiber length 6 mm, fiber strength 5.3 cN / dtex, aspect ratio 353) was added as a reinforcing fiber. .
  • Table 1 shows the performance of the obtained molded article. Although the secondary curing period is as short as 24 hours, the bulk specific gravity is greatly densified to 1.7, the bending strength is as high as 20 N / mm 2, and the dimensional change rate per specific gravity is 0.059%. Further, the water permeability and paintability were good.
  • Example 8 A molded body was prepared in the same manner as in Example 1 except that 2 parts by mass of polyacrylonitrile fiber (Dolanit, fiber diameter 12 ⁇ m, fiber length 6 mm, fiber strength 12 cN / dtex, aspect ratio 500) was added as the reinforcing fiber. Table 1 shows the performance of the obtained molded article. Although the secondary curing period is as short as 24 hours, the bulk specific gravity is greatly densified to 1.7, the bending strength is as high as 24 N / mm 2, and the dimensional change rate per specific gravity is 0.065%. Further, the water permeability and paintability were good.
  • polyacrylonitrile fiber Dolanit, fiber diameter 12 ⁇ m, fiber length 6 mm, fiber strength 12 cN / dtex, aspect ratio 500
  • Example 1 A molded body was prepared in the same manner as in Example 1 except that no PVA fiber was added and curing was performed in the atmosphere of 90% RH and 40 ° C. for 24 hours as a secondary curing. Table 1 shows the performance of the obtained molded article. The bending strength was as low as 15 N / mm 2 . Moreover, the dimensional change rate per specific gravity was as high as 0.156%, and the water permeability and paintability were insufficient.
  • Comparative example 2 A molded body was prepared in the same manner as in Comparative Example 1 except that the atmosphere was changed from the atmosphere to carbon dioxide gas 20% as a secondary curing. Table 1 shows the performance of the obtained molded article. Although the dimensional change rate per specific gravity was as low as 0.059% and water permeability and paintability were good, the bending strength was as low as 17 N / mm 2 .
  • Example 3 A molded body was prepared in the same manner as in Example 1 except that curing was performed in the atmosphere of 90% RH and 40 ° C. for 24 hours as the secondary curing. Table 1 shows the performance of the obtained molded article.
  • the bulk specific gravity was as low as 1.5 compared with Example 1.
  • the bending strength was as low as 18 N / mm 2 .
  • the dimensional change rate per specific gravity was as high as 0.167%, and the water permeability and paintability were insufficient.
  • Example 4 A molded body was produced in the same manner as in Example 1 except that curing was performed in the atmosphere of 90% RH and 40 ° C. for 14 days as a secondary curing. Table 1 shows the performance of the obtained molded article.
  • the bulk specific gravity was as low as 1.5 compared with Example 1. Since the hydration reaction of cement has progressed, the bending strength was as high as 25 N / mm 2 , but the rate of dimensional change per specific gravity was as high as 0.167%, and the water permeability and paintability were not good. It was enough.
  • Example 6 A molded body was prepared in the same manner as in Example 1 except that the pre-curing was performed under the atmosphere, 20 ° C., and 50% RH for 3 hours. Table 1 shows the performance of the obtained molded article. The bulk specific gravity was as low as 1.4, and the bending strength was as low as 20 N / mm 2 . Further, the dimensional change rate per specific gravity was as high as 0.171%, and the paintability was good, but the water permeability was insufficient. This seems to be because the carbonization was performed in a state where the molded body was not sufficiently cured by pre-curing, and therefore the expansion preceded the densification.
  • Example 7 A molded body was prepared in the same manner as in Example 1 except that PVA4 (fiber diameter 100 ⁇ m, fiber length 2 mm, fiber strength 10 cN / dtex, aspect ratio 20) was used as the PVA fiber. Table 1 shows the performance of the obtained molded article. The bulk specific gravity was as high as 1.7, the dimensional change rate per specific gravity was as low as 0.071%, and the water permeability and paintability were good, but the bending strength was as low as 17 N / mm 2 .
  • PVA4 fiber diameter 100 ⁇ m, fiber length 2 mm, fiber strength 10 cN / dtex, aspect ratio 20
  • Example 9 Compositions shown in Table 2 were prepared using the following raw materials.
  • Polyvinyl alcohol (PVA) fiber Completely saponified PVA having a polymerization degree of 1700 was dissolved in water at a concentration of 16.5%, and 1.6% boric acid was added to PVA to prepare a spinning dope.
  • the spinning dope is wet-spun into a 70 ° C. coagulation bath composed of sodium hydroxide 11 g / L and bow glass 350 g / L, and after the roller drawing, neutralization, wet heat drawing, water washing and drying, the same fiber production process In the inner heat treatment step, the film was wound by dry heat drawing at 235 ° C. so that the total draw ratio was 19 times.
  • Pulp (NUKP): (Partex cello fiber [beating degree csf 115ml (Note 1)] Cement: Ordinary Portland cement ( ⁇ belite content: 20% by mass). (Note 1) [Freeness (CSF) ml] Pulp freeness test method (JIS P8121-1976) The average value corrected to a slurry concentration of 0.3% by mass and a temperature of 20 ° C. was performed according to a Canadian standard type. The standard freeness of Canada was expressed in units of ml with an accuracy of 1 ml.
  • Pre-curing After forming the molded body, the molded body was subjected to precuring (primary curing) for 8 hours under conditions of a temperature of 50 ° C. and a saturated humidity (RH 100%). The air permeability of the molded body after pre-curing was 4 ⁇ 10 ⁇ 15 m 2 .
  • Example 10 A molded body was produced in the same manner as in Example 9, except that the amount of pulp was changed from 3 parts by weight to 4 parts by weight and the amount of Portland cement was changed from 95.5 parts by weight to 94.5 parts by weight. did. Then, pre-curing was performed in the same manner as in Example 9 except that the temperature was changed from 50 ° C. to 80 ° C. The air permeability of the molded body after pre-curing was 6 ⁇ 10 ⁇ 15 m 2 . The obtained molded body after precuring was subjected to carbonation curing in the same manner as in Example 9. Table 2 shows the performance and carbonation reaction rate of the obtained molded body.
  • Example 11 3 parts by mass of fly ash (FA) microballoon (lightweight aggregate) (Kinospheres manufactured by Kansai Matec Co., Ltd.) is added to the same amount of pulp as in Example 9, and the blending amount of Portland cement is increased from 95.5 parts by mass.
  • a molded body was produced in the same manner as in Example 9 except that the amount was changed to 92.5 parts by mass.
  • pre-curing was performed in the same manner as in Example 9 except that the temperature was changed from 50 ° C. to 80 ° C., and a molded body was produced.
  • the air permeability of the molded body after pre-curing was 7 ⁇ 10 ⁇ 15 m 2 .
  • the obtained molded body after precuring was subjected to carbonation curing in the same manner as in Example 9. Table 2 shows the performance and carbonation reaction rate of the obtained molded body.
  • Example 12 Carbonation curing was performed in the same manner as in Example 9 except that the carbon dioxide gas concentration during carbonation curing was changed from 20% to 5%. Table 2 shows the performance and carbonation reaction rate of the obtained molded body.
  • Example 13 Carbonation curing was performed in the same manner as in Example 9 except that the carbonation treatment time during the carbonation curing was changed from 12 hours to 6 hours. Table 2 shows the performance and carbonation reaction rate of the obtained molded body.
  • Example 14 Normal Portland cement 50 parts by mass ( ⁇ belite content: 20%), No. 8 silica sand (fine aggregate) 7.5 parts by mass, silica fume (EFACO manufactured by Sakai Kogyo Co., Ltd.) (fine aggregate) 4.5 parts by mass Part, 33 parts by mass of calcium carbonate (Sankyo Flour Milling Co., Ltd.
  • This molded body was subjected to pre-curing (primary curing) for 8 hours under conditions of a temperature of 50 ° C. and a saturated humidity (RH 100%).
  • the air permeability of the molded body after pre-curing was 1 ⁇ 10 ⁇ 15 m 2 .
  • the molded body after pre-curing is placed in Asahi Scientific Co., Ltd. Asahi Neutralization Tester ACT-250, treated for 72 hours at 20% carbon dioxide concentration, 40 ° C temperature, 60% humidity, and both sides of the molded body. Each was subjected to carbonation curing. Table 2 shows the performance and carbonation reaction rate of the obtained molded body.
  • normal Portland cement ⁇ belite content: 20%
  • sea sand fine aggregate
  • the obtained molded body was pre-cured under the same conditions as in Example 9 to obtain a molded body having an air permeability of 0 ⁇ 10 ⁇ 15 m 2 , and this was subjected to carbonation curing in the same manner as in Example 9.
  • Table 2 shows the performance and carbonation reaction rate of the obtained molded body.
  • staining used for the measurement of the carbonation reaction rate was shown in FIG. The entire cross section was stained red by phenolphthalein staining.
  • Example 9 Using the same fibers as in Example 9, 1.5 parts by mass of PVA fibers cut to a fiber length of 4 mm were added to 97.5 parts by mass of cement and 1 part by mass of pulp. Similarly, a molded body was produced. The obtained molded body was precured under the same conditions as in Example 9 to obtain a molded body having an air permeability of 0.1 ⁇ 10 ⁇ 15 m 2 , and this was subjected to carbonation curing in the same manner as in Example 9. . Table 2 shows the performance and carbonation reaction rate of the obtained molded body.
  • Example 10 Using the same fibers as in Example 9, 1.5 parts by mass of PVA fibers cut to a fiber length of 4 mm were added to a composition in which 3 parts by mass of pulp was blended with 95.5 parts by mass of cement. A molded body was produced in the same manner. The obtained molded body was pressed at a pressure of 8 N / mm 2 , then pre-cured by changing the pre-curing temperature 50 ° C. in Example 9 to 80 ° C., and molding with an air permeability of 0.2 ⁇ 10 ⁇ 15 m 2 . Got the body. Subsequently, the obtained molded body was carbonized under the same conditions as those in Example 9. Table 2 shows the performance and carbonation reaction rate of the obtained molded body.
  • Example 11 Using the same fibers as in Example 9, 1.5 parts by mass of PVA fibers cut to a fiber length of 4 mm were added to a composition in which 3 parts by mass of pulp was blended with 95.5 parts by mass of cement. A molded body was produced in the same manner. The obtained molded body was pressed at a pressure of 2 N / mm 2 and then subjected to pre-curing in Example 9 to obtain a molded body having an air permeability of 4 ⁇ 10 ⁇ 15 m 2 . Subsequently, the obtained molded body was carbonized under the same conditions as those in Example 9. Table 2 shows the performance and carbonation reaction rate of the obtained molded body.
  • the air permeability of the molded body after pre-curing is above a certain value. It is clear that it is important. In particular, in Comparative Example 8 in which no pulp is used in combination, the carbonation reaction rate is extremely low, and the dyeing state of phenolphthalein cannot be said to be a homogeneous reaction on the upper and lower surfaces, and the obtained physical properties was also low. Therefore, when carbonation is performed in a state where the air permeability is high, the carbonation proceeds to the inside of the molded body, thereby improving the performance of the molded body after carbonation. In Example 14, the thickness was large and vacuum extrusion molding was performed.
  • the fiber-reinforced carbonated inorganic molded plate obtained by the present invention has the characteristics that, due to carbonation, the bulk specific gravity is large, the bending strength is high, and the dimensional change rate per specific gravity is small. Materials, wall materials, etc.).

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PCT/JP2014/079278 2013-11-05 2014-11-04 繊維補強炭酸化水硬性無機質成形板及びその製造方法 WO2015068704A1 (ja)

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ES14859513T ES2857511T3 (es) 2013-11-05 2014-11-04 Placa moldeada inorgánica hidráulica carbonatada reforzada con fibra y método para la producción de la misma
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WO2018003612A1 (ja) * 2016-06-30 2018-01-04 株式会社クラレ 繊維補強炭酸化セメント成形物およびその製造方法
KR20180020949A (ko) * 2016-07-05 2018-02-28 썬전 이에스이오이 테크놀로지 컴퍼니 리미티드 친환경 흡수 판재, 상기 판재의 제조 방법 및 판재 제조용 설비 시스템
US20180072622A1 (en) * 2016-09-09 2018-03-15 Forta Corporation Enhancement of reinforcing fibers, their applications, and methods of making same
JP2019026539A (ja) * 2017-08-03 2019-02-21 鹿島建設株式会社 残存型枠用のプレキャストセメントパネル及びその製造方法
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