WO2020250359A1 - Structure en béton hautement résistante chimiquement et procédé de production - Google Patents

Structure en béton hautement résistante chimiquement et procédé de production Download PDF

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Publication number
WO2020250359A1
WO2020250359A1 PCT/JP2019/023365 JP2019023365W WO2020250359A1 WO 2020250359 A1 WO2020250359 A1 WO 2020250359A1 JP 2019023365 W JP2019023365 W JP 2019023365W WO 2020250359 A1 WO2020250359 A1 WO 2020250359A1
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Prior art keywords
layer
concrete
protective layer
binder
chemically resistant
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PCT/JP2019/023365
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English (en)
Japanese (ja)
Inventor
昌紀 塩見
清武 大森
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ゼニス羽田株式会社
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Priority to JP2019531844A priority Critical patent/JP6654273B1/ja
Priority to PCT/JP2019/023365 priority patent/WO2020250359A1/fr
Publication of WO2020250359A1 publication Critical patent/WO2020250359A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B1/00—Producing shaped prefabricated articles from the material
    • B28B1/20—Producing shaped prefabricated articles from the material by centrifugal or rotational casting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B21/00—Methods or machines specially adapted for the production of tubular articles
    • B28B21/02—Methods or machines specially adapted for the production of tubular articles by casting into moulds
    • B28B21/10—Methods or machines specially adapted for the production of tubular articles by casting into moulds using compacting means
    • B28B21/22—Methods or machines specially adapted for the production of tubular articles by casting into moulds using compacting means using rotatable mould or core parts
    • B28B21/30—Centrifugal moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B21/00—Methods or machines specially adapted for the production of tubular articles
    • B28B21/02—Methods or machines specially adapted for the production of tubular articles by casting into moulds
    • B28B21/10—Methods or machines specially adapted for the production of tubular articles by casting into moulds using compacting means
    • B28B21/22—Methods or machines specially adapted for the production of tubular articles by casting into moulds using compacting means using rotatable mould or core parts
    • B28B21/30—Centrifugal moulding
    • B28B21/32—Feeding the material into the moulds
    • 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
    • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/02—Granular materials, e.g. microballoons
    • C04B14/04—Silica-rich materials; Silicates
    • 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
    • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/02—Granular materials, e.g. microballoons
    • C04B14/04—Silica-rich materials; Silicates
    • C04B14/08—Diatomaceous earth
    • 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
    • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/02—Granular materials, e.g. microballoons
    • C04B14/04—Silica-rich materials; Silicates
    • C04B14/14—Minerals of vulcanic origin
    • 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
    • C04B18/08—Flue dust, i.e. fly ash
    • 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
    • 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
    • C04B28/18—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 mixtures of the silica-lime 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
    • C04B7/00—Hydraulic cements
    • C04B7/14—Cements containing slag
    • 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
    • C04B7/00—Hydraulic cements
    • C04B7/24—Cements from oil shales, residues or waste other than slag
    • 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
    • C04B7/00—Hydraulic cements
    • C04B7/24—Cements from oil shales, residues or waste other than slag
    • C04B7/26—Cements from oil shales, residues or waste other than slag from raw materials containing flue dust, i.e. fly ash
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
    • 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 highly chemically resistant concrete structure and a manufacturing method having excellent chemical resistance such as acid resistance and salt damage resistance, which can be applied to concrete structures such as hume pipes and manholes.
  • the concrete pipe to be replaced is an acid-resistant pipe that is resistant to corrosion by acid.
  • Known acid-resistant pipes include resin lining pipes in which the surface of concrete pipes is coated with resins such as epoxy resin, urethane resin, and acrylic resin, and resin concrete pipes using unsaturated polyester resin as a substitute for cement ( Patent Documents 1 to 3).
  • Patent Document 4 a concrete pipe in which 70% or more of the cement content in the cement concrete compound is replaced with blast furnace slag fine powder has been proposed.
  • Japanese Unexamined Patent Publication No. 52-13020 Japanese Unexamined Patent Publication No. 63-264676 JP-A-2002-248637 Japanese Patent No. 5878258
  • the conventional acid-resistant pipe and its manufacturing technology have the following points to be improved.
  • the resin lining pipe is based on a concrete pipe manufactured by a centrifugal molding machine.
  • sludge components are discharged to the inner surface of the concrete pipe. Since this sludge component is strongly alkaline and has a small amount of cement component, it is difficult to reuse it as a concrete product, and it takes a lot of labor and cost to process the sludge component, and an effective treatment method for the sludge component is in the industry. It has been an issue for many years.
  • the present invention has been made in view of the above points, and an object of the present invention is to provide a highly chemically resistant concrete structure and a manufacturing method, which are excellent in productivity and can be manufactured at a low cost. ..
  • the present invention is a highly chemically resistant concrete structure produced by centrifugation, which is latent hydraulic or pozzolan hardened by a concrete layer containing a cement-based binder A and a sludge component discharged to the inner surface of the concrete layer. It contains at least a reactive binder B and a fine aggregate C, and comprises an inner surface protective layer laminated on the inner surface of the concrete layer and centrifugally formed at the same time as the concrete layer.
  • the binder B is a latent hydraulic or pozzolan-reactive binder, for example, one or more selected from blast furnace slag fine powder, fly ash, silica fume, volcanic ash, silicic acid clay, and diatomaceous earth group. Is.
  • the fine aggregate C of the inner surface protective layer supplied to the inner surface of the concrete layer is any one or a plurality of slag-based fine aggregates, silica sand, and natural fine aggregates.
  • the inner surface protective layer comprises a buffer layer formed as a continuous structure on the inner surface side of the concrete layer and a chemical resistance layer formed as a continuous structure on the inner surface side of the buffer layer. The resistance layer has a relationship in which the amount of sludge mixed from the concrete layer is smaller than that of the buffer layer.
  • the chemical resistance layer is composed of at least a mixture of binder B, fine aggregate C and sludge water.
  • the present invention is a method for manufacturing a highly chemically resistant concrete structure manufactured by a centrifugal molding machine, in which concrete is supplied into a formwork of the centrifugal molding machine, the concrete layer is centrifugally molded and compacted, and the concrete layer is compacted.
  • a mixed material containing at least a latent hydraulic or pozzolan-reactive binder B and fine aggregate C, which is hardened by the sludge component discharged to the inner surface of the concrete layer at the time of compaction, is supplied to the inner surface of the concrete layer to provide concrete.
  • the layer and the inner surface protective layer are simultaneously centrifugally molded to be integrally molded.
  • a dry mixed material containing the binder B and the fine aggregate C is supplied to the inner surface of the concrete layer being centrifuged, or the binder B and the fine aggregate C are kneaded.
  • a paste-like mixed material containing water is supplied.
  • the binder B of the inner surface protective layer is a latent hydraulic or pozzolan-reactive binder, and is selected from, for example, blast furnace slag fine powder, fly ash, silica fume, volcanic ash, silicic acid clay, and diatomaceous earth group. It is more than one kind that was done.
  • the fine aggregate C of the inner surface protective layer is one or more selected from the slag-based fine aggregate, silica sand, and natural fine aggregate group.
  • the present invention has at least one of the following effects. ⁇ 1> Since the cement-based binder A is used as the binder of the concrete layer which occupies most of the frame of the concrete structure, the concrete layer can be easily manufactured and the binder B having high chemical resistance is used. Since the inner surface protective layer is formed at the same time as the concrete layer, a highly chemically resistant concrete structure can be manufactured in a short period of time at low cost. Furthermore, since it can be manufactured using a known centrifugal molding machine, no special additional equipment is required. ⁇ 2> In the present invention, the pipe making process can be completed and the final curing process can be started in about several tens of minutes to 2 hours while simultaneously molding the concrete layer and the inner surface protective layer.
  • the resin does not adhere until after the concrete pipe is manufactured and the inner surface is dried by steam curing, so the resin lining pipe requires a minimum of two days to manufacture, and the material reacts with the polymerization during centrifugation and is chemically hardened.
  • the time and labor required to manufacture a highly chemically resistant concrete structure can be significantly reduced, and productivity can be greatly improved. .. ⁇ 3> Since the binder B having high chemical resistance is used only for the inner protective layer that requires protection of the concrete structure, the amount of the binder B used is kept low and the chemical resistance of the inner protective layer is effective. Can be enhanced to.
  • the mixed material of the inner surface protective layer does not contain the cement-based binder A, and when the inner surface protective layer is cured by utilizing sludge water, the inner surface protective layer is contained by the binder B such as blast furnace slag or fly ash. Since the calcium hydroxide is consumed, the calcium component of the finally formed inner protective layer is significantly reduced. Therefore, the chemical resistance of the inner protective layer is significantly higher than that of the conventional one.
  • the concrete layer and the inner surface protection layer can be integrated, and the entire cross section of the concrete structure becomes a continuous structure without a clear boundary. Therefore, even if an impact is applied, the phenomenon that the inner surface protective layer is peeled off from the concrete layer is less likely to occur, and the good chemical resistance of the concrete structure can be maintained for a long period of time.
  • the buffer layer Even if a part of the chemical resistance layer of the inner protective layer is damaged, the buffer layer continues to function as the protective layer of the concrete layer, so that the guarantee period of the chemical resistance of the inner protective layer becomes extremely long. ..
  • the mixed material of the inner surface protective layer When the mixed material of the inner surface protective layer is supplied in a dry state, the sludge or sludge water discharged from the concrete layer can be used to cure the inner surface protective layer, so that sludge or sludge water that had to be discarded until now can be cured. The final recovery amount and disposal amount can be reduced.
  • binder B such as blast furnace slag fine powder and fly ash
  • high-quality, highly chemically resistant concrete structures can be economically manufactured.
  • the mixed material of the inner protective layer can be easily packaged and transported in the easily available region and country.
  • Blast furnace slag and fly ash are by-products of steelmaking, thermal power generation, etc., and the amount of CO 2 generated when manufacturing binder B with high chemical resistance is zero, which contributes to the reduction of environmental load. can do.
  • the present invention will be described below with reference to the drawings.
  • the "chemical resistance” used in the present invention means acid resistance, salt damage resistance, corrosion resistance, chemical resistance and the like.
  • the highly chemically resistant concrete structure is a concrete pipe 10 such as a hume pipe or a manhole manufactured by centrifugal molding.
  • FIG. 1 shows an enlarged cross-sectional view of the inner surface side of the concrete pipe 10.
  • the concrete pipe 10 is composed of a concrete layer 11 made of concrete formed into a cylindrical shape and an inner surface protective layer 12 formed into a tubular shape on the inner surface of the concrete layer 11.
  • the concrete layer 11 is a cylindrical tube obtained by centrifuging concrete obtained by adding and kneading cement-based binder A, an admixture such as an expansion material, fine aggregate, and coarse aggregate.
  • the cement-based binder A is not particularly limited, and for example, ordinary Portland cement, early-strength Portland cement, ultra-early-strength Portland cement, moderate heat Portland cement, low heat Portland cement, sulfuric acid-resistant Portland cement and the like can be applied.
  • the composition of the concrete layer 11 is known and is not a special formulation.
  • the inner surface protective layer 12 is a hard layer that prevents sulfuric acid and the like from penetrating into the concrete layer 11.
  • the inner protective layer 12 is composed of at least a latent hydraulic or pozzolan-reactive binder B and a fine aggregate C. These mixed materials are supplied to the inner surface of the concrete layer 11 in a dry state containing no water or a paste state containing kneading water to simultaneously form the concrete layer 11 and the inner surface protective layer 12.
  • the inner surface protective layer 12 is composed of a buffer layer 14 formed as a continuous structure with the concrete layer 11 on the inner surface side of the concrete layer 11, and a chemical resistance layer 15 formed as a continuous structure on the inner surface side of the buffer layer 14.
  • the inner surface protective layer 12 has an appropriate layer thickness at which sulfuric acid does not penetrate into the concrete layer 11.
  • the layer thickness of the inner surface protective layer 12 varies depending on the pipe diameter, but when the layer thickness is about 3 to 50 mm, it takes a long time for sulfuric acid to permeate into the concrete layer 11, and the chemical resistance of the concrete pipe 10 and two The anti-peeling effect of the water gypsum film can be guaranteed for a long period of time. It is desirable that the minimum layer thickness of the inner surface protective layer 12 is selected in consideration of the layer thickness capable of suppressing the pop-out phenomenon.
  • Binder B As the binder of the inner surface protective layer 12, a binder B having a property of combining with the sludge component (cement mortar component) of the concrete layer 11 and hardening is used.
  • the mixed material of the inner surface protective layer 12 before supply does not contain a cement-based binder.
  • the sludge component is a slurry containing cement-based binder A, fine aggregate, water, etc., and means sludge containing a large amount of solid components or sludge water containing a large amount of water components with extremely few solid components.
  • the binder B means a latent hydraulic binder or a pozzolan-reactive binder having silica or alumina that is not cured only by mixing with water but is cured by alkaline stimulation.
  • the latent hydraulic binder B for example, one or more of blast furnace slag fine powder, blast furnace granulated slag, blast furnace slow cooling slag, steelmaking slag and the like can be used.
  • the blast furnace slag fine powder defined in JIS A 6206 "Blast furnace slag fine powder for concrete" has a latent hydraulic property that densifies the structure of the inner surface protective layer 12 to improve sulfuric acid resistance and salt damage resistance.
  • pozzolan-reactive binder B for example, one or more of fly ash, silica fume, etc. can be used, and soluble silicon dioxide (SiO 2 ) is produced during hydration of cement calcium hydroxide (Ca (OH)). Combines with 2 ) to turn into insoluble hydrate.
  • volcanic ash, silicic acid white clay, or the like can be used as the binder B.
  • Fine aggregate C As the fine aggregate C for the inner surface protective layer, for example, slag fine aggregate, silica sand, natural fine aggregate and the like can be used. Since the inner surface protective layer 12 has a lower calcium content than the concrete layer 11, the chemical resistance is improved. If a slag fine aggregate is used as the fine aggregate C, the chemical resistance of the inner surface protective layer 12 is further improved.
  • Blending ratio of binder B and fine aggregate C The blending ratio of binder B and fine aggregate C is about 1: 2 as a guide.
  • the blending ratio of the binder B and the fine aggregate C is not limited to this range, and is appropriately selected in consideration of the usage of the concrete pipe 10 and the usage environment.
  • the inner surface protective layer 12 does not have a homogeneous structure mainly composed of the binder B and the fine aggregate C which are hardened by combining with the sludge component.
  • the reason why the structure is not homogeneous is that the sludge component of the concrete layer 11 is mixed with the inner surface protective layer 12 under the influence of the rotational centrifugal force, and the amount of the sludge mixed is different depending on the site. Therefore, the closer the inner surface protective layer 12 is to the inner surface of the concrete layer 11, the larger the amount of sludge mixed in, and the farther away from the inner surface of the concrete layer 11 is, the smaller the amount of sludge mixed in.
  • the buffer layer 14 laminated on the inner surface of the concrete layer 11 is mainly a mixed material of a binder B and a fine aggregate C which is hardened by combining with a sludge component. It is an intermediate protective layer formed between the concrete layer 11 and the chemical resistance layer 15. A part of the sludge component of the concrete layer 11 is mixed and compounded in the cushioning layer 14 during the molding of the inner surface protective layer 12. The amount of sludge mixed is gradually reduced from the outer surface to the inner surface of the buffer layer 14.
  • the buffer layer 14 supports chemical resistance when the chemical resistance layer 15 is damaged.
  • the chemical resistance layer 15 laminated on the inner surface of the buffer layer 14 is a protective layer mainly composed of a mixed material of a binder B and a fine aggregate C, and is formed during molding of the inner surface protective layer 12. Combines with sludge water.
  • the chemical resistance layer 15 has a relationship in which the amount of sludge mixed is smaller than that of the buffer layer 14.
  • the chemical resistance layer 15 contains almost no sludge due to centrifugal molding, and contains almost 100% of the binder B and the fine aggregate C.
  • the formwork 20 is composed of an outer frame 21 and a donut-shaped wife formwork 22, and there is no inner formwork.
  • FIG. 3 shows a cross section of the formwork 20 and the concrete layer 11 at the time of centrifugal molding.
  • the amount of concrete charged is less than the predetermined pipe thickness, and the pipe thickness of the concrete layer 11 is reduced in anticipation of the layer thickness of the inner surface protective layer 12 to be molded in the next step. deep.
  • the estimated thickness of the inner surface protective layer 12 may be set to about 3 to 50 mm depending on the diameter of the concrete pipe 10, but it is appropriately selected in consideration of the usage conditions, usage environment, etc. of the concrete pipe 10.
  • Example of mixed material for inner surface protective layer As the mixed material of the inner surface protective layer 12, for example, the following combinations can be applied. ⁇ Blast furnace slag fine powder, etc. binder B, ⁇ Slag fine aggregate C, ⁇ Fly ash, ⁇ Silica fume, -A lime-gypsum composite (expansion material) containing 1 to 15% by mass of aluminum oxide as a chemical component.
  • kneading water When supplied in a paste state An appropriate amount of kneading water may be added to the mixed material of the inner surface protective layer 12 and kneaded in advance, and then supplied in a paste state. When supplied in a paste state, cement particles, aggregate fine particles, etc. are screened and it becomes difficult to pass through the inner surface protective layer 12 as compared with the dry state, so that the sludge of the inner surface protective layer 12 is reduced, but the sludge component. Considering the amount of water recovered, the kneading water should be the minimum amount of water that can secure the fluidity that can supply the mixed material.
  • the inner surface protective layer 12 is not a homogeneous structure as a whole, and a portion adjacent to the inner surface of the concrete layer 11 is formed as a buffer layer 14 in which a large amount of sludge is mixed, and the inner surface of the concrete layer 11 is formed. It is formed as a chemical resistance layer 15 in which the amount of sludge mixed is small as the portion is separated from the concrete resistance layer 15 (FIG. 1).
  • the cement-based binder A reacts with the kneading water and hardening proceeds.
  • the latent hydraulic or pozzolan-reactive binder B combines with sludge or sludge water 13 to proceed with hardening.
  • the mold 20 is removed from the centrifugal molding machine, and the concrete pipe 10 is moved to a predetermined curing place with the concrete pipe 10 in the mold 20.
  • the curing means for example, steam curing can be used. Demolding can be accelerated by steam curing.
  • the steam curing temperature of the concrete pipe 10 is selected as appropriate so as not to adversely affect the physical properties of the concrete pipe 10.
  • the curing method is not limited to steam curing, and natural curing may be performed.
  • the concrete pipe 10 When the concrete pipe 10 reaches a predetermined demolding strength, the concrete pipe 10 is taken out from the mold 20 and a series of operations is completed.
  • the concrete layer 11 and the inner surface protective layer 12 are simultaneously molded before hardening, the inner surface of the concrete layer 11 and the inner surface protective layer 12 become more familiar, and the concrete layer 11 and the inner surface protective layer 12 become more familiar.
  • the boundary between the two and the buffer layer 14 and the chemical resistance layer 15 forming the inner surface protective layer 12 is mixed and integrated into a continuous structure. That is, the cross section of the concrete pipe 10 does not have a clear boundary surface as seen in the cross section of the conventional resin lining pipe.
  • the adhesiveness (integration) between the concrete layer 11 and the inner surface protective layer 12 is remarkably improved. Get better.
  • the cross-sectional structure of the concrete pipe 10 has an integrated continuous structure in this way, even if the inner surface of the concrete pipe 10 receives an impact, the peeling phenomenon of the inner surface protective layer 12 is unlikely to occur.
  • the inner surface protective layer 12 is a protective layer containing a latent hydraulic or pozzolan-reactive binder B as a main component, and is said to be the most sensitive to acid among cement hydrates.
  • the content of calcium hydroxide (Ca (OH) 2 ) to be produced is significantly reduced.
  • the binder B is a latent hydraulic binder typified by blast furnace slag fine powder
  • the inner surface protective layer 12 is required to be stimulated by an alkali with sludge or sludge water 13 to cure the binder B.
  • the calcium hydroxide contained in the sludge component is further consumed, the calcium component of the inner surface protective layer 12 is further reduced, and the chemical resistance is improved.
  • the binder B is pozzolan-reactive, the calcium hydroxide contained in the sludge component is combined with silicon dioxide and consumed in the curing of the binder B, so that the calcium component of the inner protective layer 12 is consumed. It decreases and the chemical resistance improves.
  • the calcium component of the buffer layer 14 is much smaller than that of the concrete layer 11, so it takes a short time. Corrosion does not proceed, and corrosion due to sulfuric acid can be continuously suppressed as the thickness of the dihydrate gypsum layer increases.
  • the presence of the buffer layer 14 not only serves as a quasi-chemical resistance layer against capillary penetration, but also easily corrodes the concrete layer 11 even if the chemical resistance layer 15 is lost due to an external impact. It also serves as a fail-safe that does not exert any effect. Since the dihydrate gypsum layer can be formed over the entire cross section of the inner surface protective layer 12, it takes an extremely long time for sulfuric acid to reach the concrete layer 11, and chemical resistance is compared with that of conventional ordinary concrete. The sexual guarantee period is dramatically extended.
  • the dihydrate gypsum layer is automatically formed when it comes into contact with acid in a common environment, but the concrete pipe 10 is preliminarily treated with sulfuric acid before shipping in a factory with a well-established manufacturing environment. It may be formed on the inner surface.
  • Example 1 The mixed material for the inner surface protective layer in Example 1 was kneaded at a ratio of blast furnace slag fine powder: blast furnace slag fine aggregate to 1: 2 and a water cement ratio of 40%.
  • Example 1 of the present invention the tube thickness (mass) was increased due to the precipitation and formation of dihydrate gypsum, but it was not dissolved in sulfuric acid. On the other hand, in the specimen of Comparative Example 1, it was confirmed that the tube thickness (mass) was significantly reduced by dissolving in sulfuric acid from the surface.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Structural Engineering (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Civil Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

Le problème décrit par la présente invention est de fournir une structure en béton hautement résistante chimiquement ayant une excellente productivité et un faible coût de production, ainsi qu'un procédé de production. La solution selon l'invention porte sur une couche de béton (11) et sur une couche de protection de surface interne (12), comprenant une couche de béton (11) moulée par fourniture de béton dans le moule d'une machine de moulage centrifuge et une couche de protection de surface interne (12) moulée par fourniture d'un matériau mélangé, comprenant au moins un liant B ayant la propriété d'être durci par un composant de boue déchargé sur la surface interne de la couche de béton (11) et un agrégat fin C, à la surface interne de la couche de béton (11) et stratification, qui sont moulées par centrifugation simultanément pour créer une construction intégrée ayant une continuité.
PCT/JP2019/023365 2019-06-12 2019-06-12 Structure en béton hautement résistante chimiquement et procédé de production WO2020250359A1 (fr)

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JP2019531844A JP6654273B1 (ja) 2019-06-12 2019-06-12 高化学抵抗性コンクリート構造体の製造方法
PCT/JP2019/023365 WO2020250359A1 (fr) 2019-06-12 2019-06-12 Structure en béton hautement résistante chimiquement et procédé de production

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JP7481874B2 (ja) * 2020-03-27 2024-05-13 住友大阪セメント株式会社 管状成形体の製造方法

Citations (2)

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JP2007313843A (ja) * 2006-05-29 2007-12-06 Denki Kagaku Kogyo Kk 遠心力成形コンクリート管の製造方法及びその遠心力成形コンクリート管
JP2016204195A (ja) * 2015-04-21 2016-12-08 ゼニス羽田株式会社 耐硫酸セメント硬化体及びその製造方法

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JPS6013990B2 (ja) * 1981-08-19 1985-04-10 電気化学工業株式会社 成型体の製法
JPS61213103A (ja) * 1985-03-18 1986-09-22 太平洋セメント株式会社 遠心力成形法によるコンクリ−ト製品の製造法
JPS62265155A (ja) * 1986-05-12 1987-11-18 山陽国策パルプ株式会社 ヒユ−ム管の製造方法
JPH01152010A (ja) * 1987-12-09 1989-06-14 Takiron Co Ltd 内面被覆コンクリート管の製造方法
JP2726475B2 (ja) * 1989-02-15 1998-03-11 電気化学工業株式会社 ライニング材とそれを使用したライニング管の製造法

Patent Citations (2)

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Publication number Priority date Publication date Assignee Title
JP2007313843A (ja) * 2006-05-29 2007-12-06 Denki Kagaku Kogyo Kk 遠心力成形コンクリート管の製造方法及びその遠心力成形コンクリート管
JP2016204195A (ja) * 2015-04-21 2016-12-08 ゼニス羽田株式会社 耐硫酸セメント硬化体及びその製造方法

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