WO2021177541A1 - Procédé de réparation et de renforcement de structure en béton utilisant des fibres tridimensionnelles - Google Patents

Procédé de réparation et de renforcement de structure en béton utilisant des fibres tridimensionnelles Download PDF

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WO2021177541A1
WO2021177541A1 PCT/KR2020/014928 KR2020014928W WO2021177541A1 WO 2021177541 A1 WO2021177541 A1 WO 2021177541A1 KR 2020014928 W KR2020014928 W KR 2020014928W WO 2021177541 A1 WO2021177541 A1 WO 2021177541A1
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filler
dimensional fiber
concrete structure
weight
dimensional
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PCT/KR2020/014928
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English (en)
Korean (ko)
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유시정
윤성원
송석민
윤한결
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(주)바우테크
유시정
윤성원
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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G23/00—Working measures on existing buildings
    • E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
    • 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
    • C04B14/10—Clay
    • C04B14/104—Bentonite, e.g. montmorillonite
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/14—Waste materials; Refuse from metallurgical processes
    • C04B18/141—Slags
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/14—Waste materials; Refuse from metallurgical processes
    • C04B18/149—Waste materials; Refuse from metallurgical processes other than silica fume or 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
    • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/24—Macromolecular compounds
    • C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • 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
    • 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
    • C04B28/06—Aluminous cements
    • C04B28/065—Calcium aluminosulfate cements, e.g. cements hydrating into ettringite
    • 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
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
    • C04B41/4501—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with preformed sheet-like elements
    • 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
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
    • C04B41/52—Multiple coating or impregnating multiple coating or impregnating with the same composition or with compositions only differing in the concentration of the constituents, is classified as single coating or impregnation
    • 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
    • C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
    • C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
    • C04B2103/34—Flow improvers
    • 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
    • C04B2111/72—Repairing or restoring existing buildings or building 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 relates to a method of repairing and reinforcing a concrete structure using three-dimensional fibers, and more particularly, repairing a concrete structure using three-dimensional fibers formed in a three-dimensional structure, but impregnating the three-dimensional fibers with a filler to make a concrete structure without a separate reinforcing material It relates to a method of repairing and reinforcing concrete structures using three-dimensional fibers that allows repair and reinforcement of concrete structures by directly attaching three-dimensional fibers to them.
  • KR 100846159 B1 (Patent Document 1), 39.58-42.12 parts by weight of cement, 41.60-45.12 parts by weight of silica sand, 13.52-14.39 parts by weight of a water-soluble polymer, and 1.78-1.89 parts by weight of silica fume are thoroughly stirred and mixed.
  • the strength of expression and the structure and pore structure of the hardened cement were improved to improve water tightness and resistance to neutralization, frost damage, and salt damage, and to have the effect of suppressing microcracks.
  • Patent Document 1 and Patent Document 2 have a low adhesion performance to a deteriorated concrete structure, so that scouring and aggregate separation occur, or pop-out ( Pop-out) may occur, and the resistance to cracking progress of deteriorated concrete was low, so cracks occurred on the surface of the repair mortar and resin coating, which had the disadvantage of having to proceed with the repair work.
  • the present invention has been devised to solve the various problems as described above, and the purpose of the present invention is to enable repair and reinforcement through a construction method of directly attaching three-dimensional fibers to a concrete structure, thereby reinforcing panels used in conventional repair and reinforcement construction methods. and to provide a method of repairing and reinforcing a concrete structure so that repair and reinforcement of the concrete structure can be conveniently performed without a reinforcing material.
  • another object of the present invention is to improve the tensile strength, compressive strength, and flexural strength of the three-dimensional fiber by impregnating the three-dimensional fiber with a filler, thereby increasing the durability of the concrete structure to prevent damage to the structure due to external impact, etc.
  • Another object of the present invention is to improve the adhesion strength between the three-dimensional fibers and concrete by impregnating the three-dimensional fibers with a filler to prevent scouring, aggregate separation and pop-out, and to maintain the adhesion for a long time.
  • An object of the present invention is to provide a method for repairing and reinforcing concrete structures using three-dimensional fibers.
  • the method of repairing and reinforcing a concrete structure using three-dimensional fibers of the present invention includes a surface treatment step (S10) of washing the concrete structure to be reinforced; Reinforcing agent application step (S20) of applying a reinforcing agent to the concrete structure after the surface treatment step (S10);
  • the surface layer 110 and the back layer 130 are sequentially and continuously connected to each other and are formed by zigzag fibers, and the inside of the three-dimensional fiber 100 is filled in a slurry state prepared by mixing a binder with a filler. It was characterized in that the slurry was impregnated with a spray gun.
  • the three-dimensional fiber attachment step (S40) and the coating material application step (S60) it characterized in that it further comprises a secondary filler application step (S50) of applying a filler to the three-dimensional fiber.
  • the filler used in the first filler application step (S30) and the secondary filler application step (S50) was prepared by mixing 28 to 32 parts by weight of binding water with respect to 100 parts by weight of the filler.
  • a filler impregnating step of impregnating the three-dimensional fiber to be attached with a filler is further included, wherein the three-dimensional fiber impregnated with the filler in the filler impregnating step is applied to the concrete structure to which the primary filler is applied. It was characterized by being attached.
  • the three-dimensional fiber attachment step (S40) characterized in that it further comprises a helical bar insertion step of inserting the helical bar into the three-dimensional fiber.
  • the filler is usually 60 to 75% by weight of Portland cement, 15 to 25% by weight of fine blast furnace slag powder, 3 to 7% by weight of calcium sulfaluminate, 3 to 7% by weight of silica fume, 0.2 to 1.0 of a thickener Weight %, antifoaming agent 0.1 to 0.2 weight %, bentonite 1.0 to 5.0 weight % and any one of acrylic resin, EVA resin, and SBR resin 1.0 to 5.0 weight %, melamine-based, naphthalene-based, polycarboxylate-based high performance Any one of the fluidizing agent was characterized in that it contains 0.5 to 3.0% by weight.
  • the repair and reinforcement of concrete is performed by directly attaching the three-dimensional fibers impregnated in the filler to the concrete structure without construction of a separate reinforcing material. It has a simple effect.
  • the adhesion strength is improved to prevent scouring, aggregate separation, and pop-out, and concrete structures generated by external impact due to elasticity. It has the effect of not only reducing the damage of steel, but also of having high durability against corrosion of reinforcing bars caused by snow removal agents, etc.
  • FIG. 1 is a flowchart showing the construction steps of the method of repair and reinforcement of a concrete structure using three-dimensional fibers of the present invention
  • FIG. 2 is a view showing a construction state of the surface treatment step of the present invention
  • 3 is a view showing the construction state of the reinforcement agent application step of the present invention.
  • FIG. 4 is a view showing a construction state of the first filler application step of the present invention.
  • FIG. 5 is a view showing the construction state of the three-dimensional fiber attachment step of the present invention.
  • FIG. 6 to 7 are views showing the three-dimensional fiber of the present invention.
  • FIG. 8 is a view showing the surface layer of the three-dimensional fiber of the present invention.
  • FIG. 9 is a view showing the back layer of the three-dimensional fiber of the present invention.
  • FIG. 11 is a view showing a construction state of the coating material application step of the present invention.
  • FIG. 12 is a cross-sectional view of a concrete structure to which the repair and reinforcement method of the present invention is constructed;
  • 1 is a flowchart showing the construction steps of the method of repair and reinforcement of a concrete structure using three-dimensional fibers of the present invention.
  • the repair and reinforcement method of the deteriorated concrete structure using the three-dimensional fiber of the present invention is a surface treatment step (S10) of washing the concrete structure to be reinforced, the above After the surface treatment step (S10), the reinforcing agent application step of applying a reinforcing agent to the concrete structure (S20), the first filler application step of applying the filler to the concrete structure after the reinforcing agent application step (S20) (S30), the first filler application After the step (S30), the three-dimensional fiber attachment step (S40) of attaching the three-dimensional fiber to the concrete structure, the coating material application step of applying the coating material to the three-dimensional fiber after the three-dimensional fiber attachment step (S40) (S60) and the coating material application step (S60) ) after curing and curing, including a curing step (S70).
  • the reinforcing agent application step of applying a reinforcing agent to the concrete structure (S20)
  • a secondary filler application step (S50) of applying a filler to the three-dimensional fiber may be further included between the three-dimensional fiber attachment step (S40) and the coating material application step (S60).
  • FIG. 2 is a view showing the construction of the surface treatment step (S10) of the present invention.
  • the surface treatment step (S10) is to maintain the working surface of the concrete structure to be repaired and reinforced in a healthy state. This is a step to remove foreign substances.
  • the surface treatment step (S10) it is preferable to wash the surface of the concrete structure using high-pressure water or the like, and to roughen the surface of the deteriorated part of the concrete to improve the adhesion.
  • the surface treatment step (S10) it is preferable to organize the concrete structure to be repaired and reinforced by chipping and washing using a hammer drill or a high-pressure washer depending on the working part of the concrete structure to be repaired and reinforced.
  • Figure 3 is a view showing the construction of the reinforcing agent application step (S20) of the present invention.
  • the reinforcing agent application step (S20) is a step of applying a permeable concrete reinforcing agent to the concrete structure after the surface treatment step (S10).
  • the reinforcing agent penetrates into the concrete, and the reinforcing agent chemically reacts with the material in the concrete to generate a waterproof function, and to improve durability and abrasion resistance.
  • FIG 4 is a view showing a construction state of the first filler application step (S30) of the present invention.
  • the first filler application step (S30) is a step of applying the filler to the concrete structure after the reinforcement agent application step (S20).
  • the first filler application step (S30) is to apply the filler to the concrete structure before attaching the three-dimensional fibers to the concrete structure, so that the three-dimensional fiber attachment step, which will be described later, is made more easily.
  • the filler used in the filler application step (S30) it is preferable to use a filler in which 28 to 32 parts by weight of bonding water are mixed with respect to 100 parts by weight of the filler.
  • the filler used in the filler application step (S30) is usually 60 to 75% by weight of Portland cement, 15 to 25% by weight of fine blast furnace slag powder, 3 to 7% by weight of calcium sulfa aluminate, and 3 to silica fume 7% by weight, 0.2 to 1.0% by weight of a thickener, 0.1 to 0.2% by weight of an antifoaming agent, 1.0 to 5.0% by weight of bentonite and 1.0 to 5.0% by weight of any one of acrylic resin, EVA resin, and SBR resin, melamine-based, naphthalene It contains 0.5 to 3.0 wt% of any one of the high-performance fluidizing agent of the polycarboxylate-based system.
  • the ordinary Portland cement is the most widely used cement, and it uses a clay material containing silica (SiO 2 ), aluminum (Al 2 O 3 ), iron oxide (Fe 2 O 3 ), and lime as the main component and mixes it in an appropriate ratio. It is made by adding 3 ⁇ 5% gypsum to the clinker obtained by calcining in a rotary kiln until a part of it is melted (about 1,450°C), and pulverizing it to a fineness of 3,200 ⁇ 3,400cm2/g.
  • the filler of the present invention it is preferable to use a mixture of 60 to 75% by weight of such ordinary Portland cement, which is a problem of setting and compressive strength reduction due to delay in initial strength development when the Portland cement is less than 60% by weight, When it exceeds 75% by weight, surface cracks occur due to drying shrinkage, and Na precipitates on the surface by evaporation of moisture after soluble components (Ca(OH) 2 , alkali, etc.) in cement are dissolved in moisture in the capillary space. 2 SO 4 , K 2 SO 4 This is because there is a problem that the efflorescence phenomenon occurs due to sulfate.
  • the fine powder of blast furnace slag refers to a product generated in the process of manufacturing pig iron in a blast furnace at a steel mill.
  • auxiliary raw materials coke, limestone
  • blast furnace slag does not harden alone, it is a latent hydraulic material that is stimulated by Ca(OH) 2 or gypsum due to hydration of Portland cement to cause hardening. It is known to be effective in places where resistance to erosion is high and chemical resistance is required.
  • such fine powder of blast furnace slag it is preferable to use a mixture of 15 to 25% by weight, which is that when the fine powder of blast furnace slag is less than 15% by weight, resistance to chemical erosion is small, and when it exceeds 25% by weight, long-term strength for latent hydraulic strength increases This is because there are problems in that early strength development is slow or cracks may occur due to drying shrinkage.
  • the calcium sulfur aluminate When the calcium sulfur aluminate is mixed with cement and water, it mainly produces ettringite or calcium hydroxide [Ca(OH) 2 ] by hydration reaction to expand the cement mortar and promote hydration. to improve the initial strength. In addition, by creating fine needle-like ethrinzite, it fills and expands micropores to prevent shrinkage of cement mortar, and furthermore, it can prevent cracking of cement mortar and improve tensile properties.
  • such calcium sulfa aluminate It is preferable to use a mixture of 3 to 7% by weight, but when calcium sulfa aluminate is less than 3% by weight, there are problems with cracking and mold demolding due to a decrease in initial strength expression, and when it exceeds 7% by weight, rapid hydration This is because problems such as rapid hardening, deterioration of workability, and volume change due to expandability occur.
  • the silica fume is micro silica particles obtained by collecting and filtering SiO2 contained in waste gas generated when manufacturing silicon (Si), ferrosilicon (FeSi), silicon alloy, etc. with a dust collector, high-strength cement and concrete products, refractories, and It is a product applied in various fields such as replacement of other asbestos.
  • the silica fume is known as an essential material for the recent production of underwater concrete or concrete requiring durability, especially high-strength concrete. It is known to improve concrete strength through pozzolan reaction with calcium hydroxide, and has latent hydraulic properties to fill micropores of cement mortar.
  • such silica fume It is preferable to use a mixture of 3 to 7% by weight. This is because when the silica fume is less than 3% by weight, it is not possible to densify the inside of the gel pores in the cement curing and curing process, and the resistance to external chemical substances and freeze-thaw is low. This is because there is a problem of lowering durability, and when it exceeds 7% by weight, problems such as deterioration of workability due to increase in viscosity of cement mortar occur.
  • the thickener gives viscosity to the cement mortar to increase the separation resistance of each material, and when used excessively, it can decrease the initial strength expression due to delay of setting of the cement mortar and reduce productivity due to high viscosity.
  • Examples of the type used as the thickener include cellulosic such as methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, hydropropylene cellulose, hydroethyl methylene cellulose, hydropropyl methyl cellulose, hydrobentonite methyl cellulose, polyacrylamide, soda acrylate, polyethylene There are acrylic oxide, a copolymer of polyacrylamide and sodium acrylic acid, and any one of them may be used or a mixture of cellulose and acrylic acid may be used.
  • any one of higher alcohols, phosphate esters, silicones, dibutyl butanediol, tributyl phosphate glycol, and non-aqueous alcohols may be used as an antifoaming agent.
  • the filler of the present invention it is preferable to use a mixture of 0.2 to 1.0% by weight of such a thickener, which has a problem of reducing the effect on separation resistance of each material when the thickener is less than 0.2% by weight, and exceeding 1.0% by weight In this case, workability is reduced due to excessive viscosity increase, and there is a problem of delaying initial strength development due to delayed hydration, which is a characteristic of cellulose-based materials.
  • the antifoaming agent is a powdery silicone type, and it is preferable to use 0.1 to 0.2 wt% of the antifoaming agent mixed in the filler of the present invention, which is less than 0.1 wt% of the antifoaming agent. Since the amount of air cannot be effectively removed, it contains an internal air content of 35-40%, which is much higher than that of a normal cement mortar of 22-25%, so there is a problem of lowering the compressive strength. This is because problems such as reduced workability and reduced resistance to freezing and thawing in winter occur due to excessive removal of air volume.
  • the bentonite powder is used to prevent cracking of the surface of the cement mortar, improving water resistance, and preventing bleeding water, and it is preferable to mix and use 1.0 to 5.0 wt% of the bentonite powder in the filler of the present invention.
  • bentonite powder If the amount of bentonite powder is less than 1.0% by weight, it has no effect on improving water resistance and removing bleeding water. because this happens.
  • any one of acrylic resin, EVA resin and SBR resin is added to 1.0 to 5.0. It is preferable to use the mixture by weight %.
  • the powdered melamine-based fluidizing agent in order to improve the fluidity of the filler, 0.5 to 3.0 parts by weight of the powdered melamine-based fluidizing agent, the naphthalene-based fluidizing agent and the polycarboxylate-based fluidizing agent are mixed with respect to 100 parts by weight of the filler. .
  • FIG 5 is a view showing a construction state of the three-dimensional fiber attachment step (S50) of the present invention.
  • the three-dimensional fiber attachment step (S50) is a step of attaching the three-dimensional fibers to the concrete structure to which the filler is applied after the first filler application step (S40).
  • the three-dimensional fiber 100 used in the three-dimensional fiber attachment step (S50) has a three-dimensional shape including a surface layer 110, a back surface layer 130, and an intermediate layer 120. It is constructed so that it has higher tensile strength and increased durability than when using the conventional planar fibers.
  • the surface layer 110 of the three-dimensional fiber 100 constitutes an attachment surface to be attached to the concrete structure, and the back layer 120 constitutes a finished surface for protecting the concrete structure.
  • FIG. 8 is a view showing the state of the surface layer
  • FIG. 9 is a view showing the state of the back layer.
  • the surface layer 110 and the back surface layer 130 are formed in a grid shape.
  • the grid spacing of the surface layer 110 is formed at an interval of 1 to 5 mm
  • the back layer 130 is preferably formed at an interval of 0.1 to 3 mm.
  • the lattice spacing of the surface layer 110 is preferably formed at an interval of 1 to 5 mm.
  • the coating material applied in the filler and coating material application step (S60) applied in the secondary filler application step (S50) to be described later is not easily applied to the back layer. If the lattice spacing of the back layer exceeds 3 mm, the strength of the three-dimensional fiber decreases as the lattice spacing is widened.
  • the lattice spacing between the surface layer 110 and the back surface layer 130 as described above, the application of the filler and coating material is facilitated, and the strength of the three-dimensional fiber is maintained.
  • the intermediate layer 120 is formed with a height of 1 to 10 mm between the surface layer 110 and the back surface layer 130 to serve as a spacer between the surface layer and the back surface layer, and according to the height of the intermediate layer 120 , the three-dimensional The thickness of the fiber 100 is determined.
  • the intermediate layer 120 is formed by zigzag-shaped fibers formed by sequentially connecting the surface layer 110 and the back surface layer 130 as shown in FIGS. 6 and 7, and is formed by such zigzag-shaped fibers.
  • the intermediate layer 120 which is the interval between the surface layer 110 and the back surface layer 130 , can always maintain a spaced state at a regular interval.
  • a space in which the filler can be easily filled and impregnated is formed between the surface layer 110 and the back surface layer 130 by the intermediate layer 120, thereby increasing the strength of the three-dimensional fiber.
  • the three-dimensional fiber 100 is made of any one of nylon, polyester, acrylic fiber, PVA fiber, polypropylene fiber, polyurethane fiber, carbon fiber, glass fiber, and aramid fiber having high strength, and thus has high compressive strength and tensile strength. And it is preferable to have flexural strength.
  • the tensile strength and durability of the concrete structure are increased, and the effect of improving resistance to salt damage and carbonation is achieved.
  • the step of attaching the three-dimensional fibers may further include a filler impregnation step of impregnating the three-dimensional fibers with the filler as shown in FIG. 10 .
  • the three-dimensional fiber 100 is formed with a thickness of 1 to 10 mm in height of the intermediate layer 120 .
  • the three-dimensional fiber 100 is easily attached to the concrete structure only with the filler applied to the concrete structure through the first filler application step, and the filler material when attached is easily impregnated into the three-dimensional fiber 100, so that the filler is impregnated into the three-dimensional fiber, thereby having the effect of repair and reinforcement.
  • the three-dimensional fiber 100 exceeds 10 mm, as the thickness of the three-dimensional fiber increases, the three-dimensional fiber is applied to the concrete structure only with the filler applied to the concrete structure in the first filler application step (S30). It may not be attached properly.
  • the three-dimensional fiber impregnated with the filler is applied to the concrete structure in the first filler application step (S30)
  • the adhesion of the three-dimensional fibers is increased, and by allowing the filler to be sufficiently impregnated into the three-dimensional fibers, the tensile strength, compressive strength, and flexural strength are improved, thereby increasing the durability of the concrete structure.
  • the filler is mixed with binding water to prepare a filled slurry in a slurry state, and then, as shown in FIG. Impregnated into three-dimensional fibers.
  • the three-dimensional fiber attachment step (S40) may further include a helical bar insertion step of inserting the helical bar into the three-dimensional fiber.
  • a helical bar is inserted into the three-dimensional fiber so that the three-dimensional fiber into which the helical bar is inserted is attached to the concrete structure.
  • the helical bar used in the helical bar insertion step is composed of a nickel-chromium alloy steel bar in which chromium (Cr) is added to nickel (Ni).
  • the helical bar has the effect of improving oxidation resistance and corrosion resistance, and by attaching the helical bar to the concrete structure with the helical bar inserted into the three-dimensional fiber, the durability of the concrete structure is increased. will be.
  • the secondary filler application step (S50) is a step of applying a filler to the three-dimensional fiber attached to the concrete structure after the three-dimensional fiber attachment step (S50), which is selectively performed depending on the state in which the three-dimensional fiber is impregnated with the filler is a step
  • the secondary filler application step (S50) when the three-dimensional fiber is sufficiently impregnated with the filler, the secondary filler application step (S50) is omitted, the coating material application step (S60) to be described later is performed, and when the three-dimensional fiber is not sufficiently impregnated with the filler, the secondary filler application step ( After performing S50) so that the three-dimensional fiber can be sufficiently impregnated with the filler, a coating material application step (S60), which will be described later, is performed.
  • the filler used in the secondary filler application step (S50) may be of the same component as the filler used in the primary filler application step (S30).
  • the three-dimensional fiber can be sufficiently impregnated with the filler to increase the durability of the three-dimensional fiber.
  • FIG. 11 is a view showing a construction state of the coating material application step of the present invention.
  • the coating material application step (S60) is a step of applying a coating material to the surface of the attached three-dimensional fiber as shown in FIG. 11 after the three-dimensional fiber attachment step (S50).
  • the coating material used in the coating material application step (S60) is prepared by mixing a flame retardant containing a water-soluble acrylic resin and an inorganic composite material, and a neutralizing agent containing a water-soluble acrylic resin and an inorganic composite material.
  • the inorganic composite material included in the flame retardant and the neutralizing agent is manufactured to include No. 8 silica sand, cement and silica fume.
  • the coating material includes a flame resistant material and a neutralization prevention material to prevent deterioration of the durability of the concrete structure due to salt or the like through the coating material application step (S60), and to prevent deterioration of concrete due to corrosion of reinforcing bars is to do it
  • the curing step (S70) is a step of naturally curing the applied filler after the coating material application step (S60).
  • the three-dimensional filling fiber 200 which is a three-dimensional fiber impregnated with a filler, is formed in the concrete structure to be repaired and reinforced, thereby repairing and strengthening the concrete structure using the three-dimensional fiber. This is done.
  • the deteriorated part of the concrete structure is repaired and reinforced by the repair and reinforcing layer 300, and the filler layer 400 is formed on the surface of the repair and reinforcing layer, so that the filler layer 400
  • the filling three-dimensional fiber 100 is attached to the concrete structure, the filling three-dimensional fiber 200 is formed.
  • the adhesion strengths of Examples 1, 2, and 3 were 1.8N/mm2, 1.9N/mm2, and 1.6N/mm2, respectively, higher than 1.3N/mm2 of Comparative Example 1 and 1.1N/mm2 of Comparative Example 2 It was shown to have strength, and as it was shown that the filler having W/B within the range of Examples 1 to 3 had higher adhesion strength, the three-dimensional fiber by using such a filler in the three-dimensional fiber attachment step It can have the effect of increasing the adhesion between the concrete and the concrete.
  • Examples 1 to 3 are made within a range not exceeding 30 seconds, so that a filler having excellent impregnation property and workability can be prepared. Able to know.
  • Comparative Example 1 As the consistency exceeds 30 seconds, the impregnation property and workability are reduced, and in the case of Comparative Example 2, the consistency is 15 seconds, which is very excellent in the filling of the three-dimensional fibers, but the repair and reinforcement of the structure As the compressive strength, bending strength and adhesion strength of the three-dimensional fiber to be attached are low, there is a need to accompany a separate operation to compensate for this. Inappropriate.
  • the adhesion between the three-dimensional fibers and concrete is increased by first applying to the concrete, and the durability of the three-dimensional fibers is increased by secondarily applying to the three-dimensional fibers attached to the concrete. to make it happen
  • the method of repairing and reinforcing a concrete structure using three-dimensional fibers according to the present invention can greatly contribute to the repair and reinforcement of concrete through the construction of directly attaching the three-dimensional fibers impregnated in the filler to the concrete structure without the construction of a separate reinforcing material.

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  • Chemical & Material Sciences (AREA)
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  • Ceramic Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
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  • Chemical Kinetics & Catalysis (AREA)
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Abstract

La présente invention concerne un procédé de réparation et de renforcement d'une structure en béton utilisant des fibres tridimensionnelles et, plus spécifiquement, un procédé de réparation et de renforcement d'une structure en béton utilisant des fibres tridimensionnelles, la structure en béton étant réparée en utilisant des fibres tridimensionnelles formées selon une structure tridimensionnelle, et la réparation et le renforcement de la structure en béton étant obtenus en fixant directement les fibres tridimensionnelles à la structure en béton sans matériau de renforcement séparé, en imprégnant les fibres tridimensionnelles avec une charge.
PCT/KR2020/014928 2020-03-02 2020-10-29 Procédé de réparation et de renforcement de structure en béton utilisant des fibres tridimensionnelles WO2021177541A1 (fr)

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KR102271429B1 (ko) * 2020-11-20 2021-07-02 한국건설기술연구원 광촉매를 혼입한 고성능 시멘트복합체 조성물 및 그 제조방법
KR102265457B1 (ko) * 2020-11-26 2021-06-16 한국건설기술연구원 광촉매와 폴리머섬유 혼입 모르타르에 의해 표면 처리된 시멘트복합체 및 그 시공방법
KR102425765B1 (ko) * 2022-01-27 2022-07-28 주식회사 정우콘크리트 보행약자의 안전한 보행을 위한 미끄럼방지 및 항균성을 가지는 보차도 블록
KR102640408B1 (ko) * 2023-06-28 2024-02-23 우상디앤씨 주식회사 자기치유 숏크리트 조성물을 이용한 스케이트보드용 다중곡면 구조물 시공방법

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JP2007239421A (ja) * 2006-03-13 2007-09-20 Fujita Corp 既設構造物の補強工法
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