WO1995033109A1 - Materiau de renforcement composite a base de resine renforcee par fibres, et son procede de production - Google Patents

Materiau de renforcement composite a base de resine renforcee par fibres, et son procede de production Download PDF

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Publication number
WO1995033109A1
WO1995033109A1 PCT/JP1995/001029 JP9501029W WO9533109A1 WO 1995033109 A1 WO1995033109 A1 WO 1995033109A1 JP 9501029 W JP9501029 W JP 9501029W WO 9533109 A1 WO9533109 A1 WO 9533109A1
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WO
WIPO (PCT)
Prior art keywords
fiber
core
reinforcing
resin composite
reinforced
Prior art date
Application number
PCT/JP1995/001029
Other languages
English (en)
Japanese (ja)
Inventor
Toshikazu Takeda
Masaki Shimada
Yoichi Kitagawa
Yoshikazu Izumihara
Masato Miyake
Masayuki Andoh
Toshiaki Seki
Shuuji Takiyama
Kohji Ogata
Original Assignee
Nippon Steel Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP6115001A external-priority patent/JP3064179B2/ja
Priority claimed from JP06115002A external-priority patent/JP3088061B2/ja
Application filed by Nippon Steel Corporation filed Critical Nippon Steel Corporation
Priority to CA002191241A priority Critical patent/CA2191241A1/fr
Publication of WO1995033109A1 publication Critical patent/WO1995033109A1/fr

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/07—Reinforcing elements of material other than metal, e.g. of glass, of plastics, or not exclusively made of metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/06—Fibrous reinforcements only
    • B29C70/10—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres
    • B29C70/16—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/06—Fibrous reinforcements only
    • B29C70/10—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres
    • B29C70/16—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length
    • B29C70/20—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length oriented in a single direction, e.g. roofing or other parallel fibres
    • B29C70/205—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length oriented in a single direction, e.g. roofing or other parallel fibres the structure being shaped to form a three-dimensional configuration

Definitions

  • the present invention relates to a fiber-reinforced resin composite reinforcing material used as a reinforcing bar when embedded in a concrete product such as a building or structure made of the concrete and used as a reinforcing bar. It relates to a manufacturing method. Background art
  • fiber-reinforced resin composite reinforcing bars have been proposed as substitutes for reinforcing bars or PC steel wires.
  • This fiber reinforced resin composite reinforced material is formed by impregnating a high elasticity, high strength continuous fiber such as carbon fiber or aramide fiber with a thermosetting epoxy resin and curing it. It is known as a lightweight, high-strength, high-corrosion-resistant reinforcement.
  • Such a fiber-reinforced resin composite rebar has many characteristics such as light weight, high strength and high corrosion resistance, and can be cut with a woodworking saw and has excellent cutting properties. Therefore, it is expected that its use as reinforcing bars embedded in various concrete products will be expanded in the future.
  • the first problem is that the fiber-reinforced resin composite reinforced material has a low surface adhesion and therefore has a poor transmission of tensile force due to its smooth surface.
  • the second problem is that it is difficult to increase productivity, and in view of the strength of the reinforcing fiber used, its guaranteed strength is only at a very low level, in fact less than half. Is not expressed That is it.
  • the first method is to form a convex portion by winding a plurality of reinforcing woven bundles around a core portion, as proposed in Japanese Patent Application Laid-Open No. 61-274036, and to adhere to the concrete. How to ensure.
  • the second method is a method in which a granular material (Japanese Patent Application Laid-Open No. 4-363454) and a short-woven fiber (Japanese Patent Application Laid-Open No. 2-248559) are adhered to the surface.
  • the third method is to increase the adhesive force by directly providing a mechanical recess in the core as proposed in JP-A-63-206548 and JP-A-63-219746. .
  • the core fiber undulates or the core fiber is mechanically damaged, so that the adhesion to the concrete increases, but the core strength is increased. This is unsuitable from the viewpoint of producing a high-strength fiber-reinforced resin composite reinforcing bar.
  • it is disadvantageous in terms of cost because it is necessary to increase the amount of fiber to satisfy the required strength.
  • the second method is to use small granular materials and short fibers that are not continuous.
  • the resin is only adhered to the surface of the core with the adhesive force of the resin, and sufficient adhesive force with the concrete cannot be secured.
  • the first method can be said to be the most excellent in that it can be manufactured without reducing the fiber strength of the core portion.
  • the adhesion to the concrete can be improved without impairing the high fiber strength of the core. It is difficult to increase it to a level comparable to that of steel, and up to now, there is no known fiber-reinforced resin composite reinforcing material with a level of strength that exceeds or exceeds that of rebar.
  • an object of the present invention is to provide a fiber-reinforced resin composite reinforced material capable of exhibiting an adhesion to a concrete that is equal to or greater than that of a metal reinforcing bar without deterioration in core strength. Is to do.
  • Another object of the present invention is to make it possible to bring out the strength of the reinforcing fiber itself, thereby reducing the amount of reinforcing fiber and thereby reducing the product cost.
  • Another object of the present invention is to provide a fiber-reinforced composite reinforcing material having a high guaranteed strength.
  • Still another object of the present invention is to provide a fiber-reinforced resin composite reinforcing material having a high dimensional accuracy by bending at a predetermined radius of curvature and having high strength.
  • Another object of the present invention is to provide a method for easily producing a fiber-reinforced resin composite rebar having high dimensional accuracy and high strength, which is curved at a predetermined radius of curvature, without deteriorating its strength. Is to provide. Disclosure of the invention
  • the present inventors have conducted intensive research to solve the above problems, and as a result, regarding the first problem,
  • the reinforcing fiber bundle constituting the convex portion on the surface is twisted to reduce the strength of the core without deteriorating the strength of the core portion. It has been found that the adhesion can be significantly improved.
  • the core part and the convex part are sequentially formed, and the obtained molded body is heat-cured while applying a tensile force in the axial direction (the direction of the reinforcing fiber bundle), thereby forming a peripheral part.
  • tensile stress to the resin (resin is easily broken by tensile stress, so that compressive stress is applied)
  • aligning the fiber direction and applying tensile stress the high strength of the reinforcing fiber itself and It has been found that a high elasticity can be obtained, and thus, a fiber-reinforced composite reinforcing material having high production efficiency and high guaranteed strength can be manufactured.
  • the present invention relates to a core and a crimped portion made of a thermosetting composition comprising a thermosetting resin and a reinforcing fiber bundle (the crimped portion forms a convex portion on the surface of the core portion).
  • this composite rebar for example, a filament winding device is used, jigs having a plurality of pins are attached to both end chuck portions of the device, and heat is applied between the pins of the pair of jigs.
  • a reinforcing fiber impregnated with a thermosetting resin is impregnated with a fiber bundle for impregnating the thermosetting resin on the surface of the core by wrapping the reinforcing fiber bundle impregnated with the curable resin and forming the core by the filament winding method.
  • the convex is formed by tightening, and the obtained molded body is subjected to a thermosetting treatment while applying a tensile force in the axial direction.
  • a predetermined twist is applied to the reinforcing woven bundle that forms the convex portion.
  • the composite reinforcing material of the present invention has a high tensile strength that exhibits the original strength of the reinforcing fiber, and significantly improves the adhesion to the concrete while preventing fiber damage.
  • the present invention provides a core formed from a reinforcing woven fiber bundle impregnated with a thermosetting resin and having a predetermined twist, and a reinforcing fiber bundle impregnated with the thermosetting resin wound around the core.
  • a curved fiber-reinforced resin composite reinforced material having a convex portion formed as a whole and having a predetermined radius of curvature.
  • this composite rebar In order to manufacture this composite rebar, the core is first formed and then After the core is twisted, at least one reinforced fiber bundle impregnated with a thermosetting resin is used to form a convex portion, and the obtained core member with a convex portion, that is, the molded body is bent at a predetermined radius of curvature.
  • the thermosetting resin impregnated in the reinforcing fiber bundle is heat-set while applying a certain tensile stress to the core while fixing the core in a curved shape.
  • a convex portion is formed on the molded core portion by using a reinforcing woven fiber bundle impregnated with at least one thermosetting resin, and twisting is performed in the same direction as the formed convex portion.
  • the core member with a convex portion that is, the molded body is fixed in a curved mold having a predetermined radius of curvature, and a thermosetting resin is impregnated into the reinforcing fiber bundle while applying a constant tensile stress to the thermosetting resin.
  • the curved fiber-reinforced resin composite bar thus manufactured is extremely preferable as a reinforcing bar used for excavating a pit for sewerage works, subway works and the like.
  • FIG. 1 is a partially sectional front view of a jig used in the filament winding method.
  • FIG. 2 is a conceptual explanatory diagram of the filament winding method.
  • FIG. 3 is a partial perspective view of a metal fixed type.
  • FIG. 4 is a partial front view showing a fiber-reinforced resin composite reinforced material according to one embodiment of the present invention.
  • FIG. 5 is a partial front view showing the fiber-reinforced resin composite reinforcing bar of Comparative Example 1.
  • FIG. 6 is a partial cross-sectional front view showing the fiber-reinforced resin composite reinforced material of Comparative Example 3.
  • FIG. 7 is a partially sectional front view showing a test method of a tensile test.
  • No. 813 ⁇ 4 is the average bond stress and slip amount obtained from the tensile test.
  • FIG. 6 is a graph showing the relationship between
  • FIG. 9 is a partial cross-sectional perspective view showing a pad-like specimen used in a tensile test in the present invention example and the comparative example.
  • FIG. 10 is a partial perspective view showing a state in which a curved fiber reinforced resin composite reinforced material according to another embodiment of the present invention is formed.
  • FIG. 11 is a partial perspective view showing a curved fiber reinforced resin composite reinforced material according to another embodiment of the present invention.
  • the reinforcing fibers for forming the reinforcing fiber bundle are conventionally known as long as the fibers are continuous from the starting end to the end of the composite reinforcing bar to be manufactured.
  • the thermosetting resin (reinforced resin) to be impregnated into the reinforcing fiber bundle conventionally known ones can be appropriately used, and examples thereof include an epoxy resin, a phenol resin, and a polyamide resin. be able to.
  • reinforcing fibers and thermosetting resins can be appropriately selected depending on the use of the composite reinforcing material to be produced, but from the viewpoints of heat resistance, corrosion resistance, etc., the reinforcing fibers are preferably made of carbon. It is a fiber, and the thermosetting resin is preferably an epoxy resin.
  • the molding of the core portion may be performed, for example, from the viewpoint of simply improving the adhesiveness of the concrete, by, for example, using a carbon woven yarn impregnated with a thermosetting resin as a core and surrounding the core with a thermosetting resin impregnated.
  • the following method is used.
  • a jig having a plurality of pins is attached to both ends of a filament winding device (hereinafter abbreviated as “FW device J”), and thermosetting is performed between the pins of the pair of jigs.
  • a reinforcing fiber bundle impregnated with a conductive resin is wrapped around the core, and a core is formed by a filament winding method (hereinafter abbreviated as “FW method J”).
  • FW method J This is a method in which a convex portion is formed by winding a reinforcing fiber bundle impregnated with resin to form a convex portion, and the obtained molded product is thermally cured while applying a tensile force in the axial direction. This method is specifically described below. I do.
  • a grip portion 2 is provided on the base end side and a plurality of (2 to 10) pins 3 are provided on the distal end side.
  • a pair of metal jigs 1 each having a fixing portion 4 composed of a male screw 5 and a nut 6 are prepared. Attach it to the chuck section 8 at both ends of the twisting device 7.
  • thermosetting resin impregnated with the thermosetting resin impregnated with the thermosetting resin is traversed by the traverser 11 until the diameter of the woven bundle reaches a required value between the plurality of pins 3 provided on the pair of jigs 1.
  • a plurality of thermosetting resin impregnated reinforcing fiber bundles are arranged in the axial direction to form a core.
  • the core formed in this manner is included in the reinforcing fiber bundle.
  • the soaked thermosetting resin must be in a completely uncured state until the next time a convex is formed on the surface and it is thermoset, but even if it is completely uncured, Further, it may be in a semi-cured state called B stage.
  • the fiber volume content of the core is preferably 40 to 0%, more preferably 50 to 60%. When the fiber volume content is lower than 40%, the resin is excessive and the resin is hardened at the time of curing. There is a risk that sagging will occur, and if it is greater than 70%, there is a risk that poor adhesion between the core and the protrusion may occur due to insufficient resin.
  • At least one reinforcing fiber bundle impregnated with a thermosetting resin is wound around the surface to form a convex portion, and the core and the surface are formed on the core.
  • the molded body has a convex portion.
  • the impregnation of the reinforcing fiber bundle with the thermosetting resin and the winding around the core may be continuously performed using a FW device at the time of molding the core. It may be carried out by bringing in a reinforcing fiber bundle impregnated with a thermosetting resin in advance.
  • thermosetting resin impregnated in the reinforcing fiber bundle to form the convex portion and the fiber volume content thereof may be the same as in the case of the core portion.
  • the reinforcing fiber bundle impregnated with a thermosetting resin to be wound around the surface of the core is preferably 10 to 10 m / m per reinforcing fiber bundle in order to improve the adhesion to the concrete. Twisting the core 50 times and winding it around the core should be done at an angle of 65 to 85 ° to the axial direction.
  • the twist given to the reinforcing woven fiber bundle constituting the convex portion is less than 10 times per 1 m, the adhesion to the concrete is not significantly improved, and if it exceeds 50 times, fiber damage and damage may occur. A decrease in adhesion to the core occurs.
  • the angle at which the twisted reinforcing fiber bundle is wrapped is smaller than 65 ° with respect to the axial direction of the core, there is a problem that the adhesive strength of the concrete decreases. On the other hand, even if the angle is larger than 85 °, the problem of a decrease in concrete adhesion occurs.
  • the molded body in which the protrusions are formed by winding the fiber bundle for impregnating and reinforcing the thermosetting resin on the surface of the core portion is used in order to sufficiently exhibit the strength of the reinforcing fiber used.
  • the molded body is thermoset while applying a tensile force in the axial direction (that is, a tensile force on the axial fibers constituting the core).
  • both ends of the molded body are fixed to a metal with a pair of jigs. It is fixed to both ends of the mold, and the whole is heated as it is with the metal fixed mold, and the thermosetting resin impregnated in the reinforcing woven fiber bundle is thermoset, and due to the thermal expansion of the metal fixed mold at this time,
  • This is a method of applying a tensile force to a molded body.
  • the molded body 12 formed as described above and having the uncured core 13 and the uncured protrusion 14 is removed together with the pair of jigs 1 from the both-ends chuck 8 of the FW device 7.
  • a metal material having a thermal expansion coefficient at least larger than the thermal expansion coefficient of the reinforcing fiber bundle is utilized by using the male screw 5 and the nut 6 of the pair of jigs 1 located at both ends thereof.
  • thermosetting resin impregnated in the reinforcing woven fiber bundle of the molded body 12 is fixed on both ends of the fixed mold 15, 50 in this state at a temperature of about 1 10 to 200 DEG e C Heat treatment is performed for 120 minutes to thermally cure the thermosetting resin impregnated in the reinforcing woven fiber bundle of the molded body 12, thereby forming the reinforcing fiber bundle in the reinforcing fiber bundle as shown in FIG.
  • a fiber-reinforced resin composite reinforced material 16 having a core portion 17 and a convex portion 18 in which the thermosetting resin impregnated into the resin is cured is obtained.
  • the tensile force applied at the time of this heat curing is preferably from 500 to 3,000 a / m, preferably from 800 to 2,000 ⁇ m in terms of strain. If the amount of strain due to the tensile force applied during this thermosetting is less than 500 ⁇ m, it is not possible to develop high strength enough to overcome the thermosetting resin existing around the reinforcing fibers, and the orientation of the reinforcing fibers The strength of the reinforcing fiber is reduced, and the original strength of the reinforcing fiber cannot be exhibited. As a result, if external stress is actually applied, excessive stress is applied to the resin, and the composite reinforcing material is broken. On the other hand, if it exceeds 3,000 mm Zm, the reinforcing fabric will be damaged, and the strength will be reduced.
  • the tensile force exists as a residual stress even at room temperature, and therefore, the amount of strain due to the tensile force remains at room temperature.
  • a compact was set at a room temperature of 20 in an iron metal fixed mold 15 having an expansion coefficient of 1 ⁇ 10 5 (1Z.C), and a thermosetting treatment was performed under the following conditions.
  • Male reinforcing fibers have a very low coefficient of thermal expansion as compared to iron, so 1 10.
  • C a tensile stress of about 800 / Zm by performing a heat hardening treatment for 60 minutes, and 220.
  • a tensile stress of about 2,000 Zm could be developed. This range of tensile stress is particularly preferred.
  • the composite reinforcing material uses the same reinforcing fibers and thermosetting resin (reinforced resin) as in the case of the linear composite reinforcing material.
  • a FW device in order to manufacture a molded body of the curved composite reinforcing bar.
  • one of a pair of jigs 1 (see FIGS. 1 and 2) used in the above method is fixed, and the other is rotated to apply a predetermined twist to the core of the molded body.
  • the twist applied to the core should be 0.5 to 1 rotation per meter. If the core is not twisted, or if the twist is less than 0.5 rotations per lm, it may cause local buckling of the compact when the compact is maintained in a curved shape. If the rotation exceeds 1 rotation per lm, the torsion may return after curing due to the rigidity of the reinforcing fiber.
  • the core is twisted, and at least one reinforcing fiber bundle impregnated with a thermosetting resin is wound around the surface thereof. Protrusions may be formed.
  • the impregnation of the thermosetting resin into the reinforcing woven fiber bundle and the winding around the core may be performed continuously using a FW device during molding of the core.
  • the method may be carried out by bringing in a reinforcing fiber bundle impregnated with a thermosetting resin in advance.
  • thermosetting resin impregnated in the reinforcing fiber bundle of the molded body manufactured in this way needs to be in a state where it is not completely cured until it is thermally cured in the next step, but it is not completely cured. It may be in a cured state or in a semi-cured state called a B stage.
  • the fiber volume content of the core is preferably 40 to 0%, more preferably 50 to 60%. If the fiber volume content is lower than 40%, the resin is excessive. However, there is a problem that resin dripping occurs at the time of curing, and if it exceeds 70%, there is a problem that insufficient resin causes poor adhesion between the core portion and the convex portion.
  • the molded body is removed together with the pair of jigs 1 from both end chuck portions 8 of the FW device 7 shown in FIG. 1, and then, as shown in FIG. Using a male screw 5 and a nut 6 of a fixing portion 4 provided on the jig, a curved portion having a receiving portion 13 having a predetermined radius of curvature and jig stoppers 14 provided at both ends thereof. Mounted on mold 12. In this state, the molded body is heated at about 110 to 200'C for 50 to 120 minutes while applying a tensile force using a mechanical method or the thermal expansion of a metal mold, and the core is formed.
  • thermosetting resin impregnated in the reinforcing woven fiber bundles constituting the convex portions and the convex portions is thermoset, and the convex portions 17 are wrapped around the core 16 as shown in Fig. 1.
  • the curved male fiber reinforced resin composite reinforcing material 15 is manufactured.
  • the tensile force in this case is also applied to the formed body so as to impart a strain of 500 to 3000 Zm to the composite reinforcing bar.
  • the radius of curvature of the curved fiber reinforced resin composite reinforcing material is not particularly limited.
  • a composite reinforcing material used for excavating a pit for sewerage works is about 6 to 10 m, and electric underground wiring is used.
  • a predetermined twist is applied to the reinforcing fiber bundle that forms the convex portion on the surface of the core portion, thereby increasing the peak height of the convex portion.
  • thermosetting is performed while applying tensile force to the axial textile of the obtained molded body.
  • thermosetting is performed while applying tensile force to the axial textile of the obtained molded body.
  • the reinforcing fibers constituting the obtained curved composite reinforcing material do not undergo local buckling or deterioration in strength, and the manufactured reinforcing material is reheated. This eliminates the need for time-consuming operations such as bending and bending, thus greatly facilitating the manufacturing process of the curved fiber-reinforced resin composite rebar.
  • Epoxy resin is impregnated into a carbon fiber having an elastic modulus of 3.4 xl 0 5 MPa, and a core having a diameter of 200 in which the carbon fiber is axially oriented at a volume ratio of 55% is used. Twenty twisted winding fibers impregnated with epoxy resin are twisted 20 times per meter into 8 bundles of carbon fiber bundles, and coiled at an angle of 80 ° with respect to the axial direction of the core. The molded body is formed by winding, and the thermosetting resin impregnated in the carbon fiber bundle forming the core portion and the convex portion of the molded body is cured, and as shown in FIG. 4, the core portion and the surface thereof are formed.
  • a fiber-reinforced resin composite bar of a product in which a thermosetting resin impregnated in a carbon woven fiber bundle is cured and has a convex portion 18 formed of a winding carbon fiber bundle twisted into Material 16 was produced.
  • the surface of the core 17 is twisted in the axial direction with a bundle of carbon fibers for tightening, which is turned into a coil form at an angle of 80 °, Except for forming the convex part 18 oriented in the cloth, A fiber-reinforced resin composite reinforcing material 16 was produced in the same manner as in Example 1, and this was used as Comparative Example 1.
  • a surface layer 19 (composed of fiber and impregnated resin) having a wavy height of about 3 mm is formed on the surface of the core 17 without performing the tightening.
  • a fiber-reinforced resin composite reinforced material 16 was produced in the same manner as in Example 1 except that the projections were formed on the surface of the core 17.
  • the results are shown in FIG.
  • the amount of slip on the horizontal axis in this figure represents the numerical value of the displacement meter 20, and indicates the amount of pullout of the composite bar from the concrete.
  • the fiber-reinforced resin composite reinforced material of Example 1 exhibited an adhesive force equal to or higher than that of the iron reinforced material of Comparative Example 4.
  • the fiber-reinforced resin composite reinforced material of Comparative Example 1 had a high initial strength, but then suddenly showed a decrease in strength. In Comparative Example 2 where no twist was applied, the adhesive strength was Less than half.
  • Epoxy resin is impregnated into a carbon fiber having an elastic modulus of 3.4 xl 0 5 MPa, and a core having a diameter of 200 in which the carbon fiber is axially oriented at a volume ratio of 55% is used. Twenty twisted weaves, impregnated with epoxy resin, are twisted 20 times per meter into eight bundles of Z bundles of carbon fibers, and 80 with respect to the axial direction of the core. The formed body was wound in a coil shape at an angle of, and formed using a filament winding apparatus.
  • the obtained molded body together with the jigs attached to both ends thereof were removed from the filament winding device, and as shown in FIG. and fixed to the fixed mold, the epoxy resin impregnated into the carbon fiber bundle that form a molded body is heat cured in a heating treatment of 0.99 e C, 60 min, manufactured of woven fiber-reinforced resin composite muscle material example 2 did.
  • the tensile force acting on the fiber-reinforced composite fiber due to the thermal expansion force of the fixed type was as shown in Table 1.
  • a molded article was obtained in the same manner as in Example 2 except that the epoxy resin impregnated with the carbon fiber bundle of the molded article was heat-treated at 60 for 90 minutes when thermally cured.
  • a fiber reinforced resin composite reinforced material was produced in the same manner as in Example 2 except that no axial tensile force was applied to the core by the jig during the molding of the molded body.
  • the heat curing treatment conditions at this time were the same as those in Example 2 at 150 eC for 60 minutes.
  • Comparative Example 5 showed a larger breaking load than Comparative Example 6, but the amount of strain was out of the range of the present invention.
  • the strength of the composite bar deteriorated.
  • Example 2 exhibited a larger breaking load than Comparative Example 5.
  • the obtained molded body was subjected to a tensile test in the same manner as in Example 2 and Comparative Examples 5 and 6 above.
  • the breaking load was 4.85 ⁇ 10 5 N, which was a remarkably high value as compared with the above-mentioned comparative example 6 having no load.
  • Example 4 The elastic modulus is 3.4 x i0 5 MPa ⁇ , ( ⁇ (! Using a bundle of 6 carbon fibers and epoxy resin, it takes 30 times using a FW device (manufactured by B0LENZ & SCHAFER, Germany). FW method, formed about 3 m of core of about 020 with a fiber volume content of 55%, twisted 2.4 times (0.8 turns Zm), and then 12,000 carbon bundles of Z bundle The core was wound up with a bundle of four fibers.
  • the obtained core with protrusions is fixed in a metal bending mold with a bending radius of 15 m, and is heat-cured at 150 ° C for 1 hour.A hip with a bending radius of 15 m and a strain of 12000 / Zm due to tensile force A curved carbon fiber reinforced resin composite reinforced material was obtained.
  • the fiber reinforced resin composite reinforcing material of the present invention can exhibit excellent concrete adhesion without deteriorating the strength of the core, and has many characteristics such as light weight, high corrosion resistance, and good machinability. It has both.
  • a high-strength fiber-reinforced composite bar having a high guaranteed strength can be easily produced with extremely high productivity, and the original strength of the reinforcing fiber can be efficiently exhibited.
  • the required strength can be developed with a smaller amount of fiber, the economical efficiency is excellent, and a large amount can be supplied to the market, and the spread thereof can be promoted.
  • a bent high-strength fiber-reinforced resin composite reinforced material with high dimensional accuracy can be easily manufactured without deterioration in strength, and a curved radius of curvature of 2 m or more can be obtained.
  • a high-strength fiber-reinforced resin composite reinforced material with high dimensional accuracy can be provided.
  • fiber-reinforced resin composites whose demand is expanding as a substitute for rebar or PC steel wire, can be provided at low cost, and their use can be expanded over a wider range. Things.

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Abstract

On produit un matériau de renforcement composite curviligne à base de résine renforcée par fibres en formant un corps par enroulement d'un faisceau de fibres de renforcement imprégné de résine thermodurcissable, torsadé sur une certaine étendue, autour de la surface d'une âme constituée d'un faisceau de fibres de renforcement imprégné de résine thermodurcissable, et en faisant subir au corps ainsi formé un traitement de thermodurcissement tout en le soumettant à une tension pour produire une courbure de 500-3000 ν/m dans le sens axial dudit corps. Une variante consiste à fixer le corps formé par enroulement d'un faisceau de fibres de renforcement imprégné de résine thermodurcissable autour de l'âme torsadée dans un moule incurvé, dont le rayon de courbure est prédéterminé, et en soumettant ledit corps à un traitement de thermodurcissement. Le procédé proposé permet d'obtenir, de façon économique, un matériau composite à base de résine renforcée par fibres qui est très résistant et qui peut être utilisé pour remplacer une tige de fer ou un fil d'acier PC.
PCT/JP1995/001029 1994-05-27 1995-05-29 Materiau de renforcement composite a base de resine renforcee par fibres, et son procede de production WO1995033109A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA002191241A CA2191241A1 (fr) 1994-05-27 1995-05-29 Materiau de renforcement composite a base de resine renforcee par fibres, et son procede de production

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP6115001A JP3064179B2 (ja) 1994-05-27 1994-05-27 彎曲繊維強化樹脂複合筋材及びその製造法
JP6/115001 1994-05-27
JP6/115002 1994-05-27
JP06115002A JP3088061B2 (ja) 1994-05-27 1994-05-27 繊維強化樹脂複合筋材及びその製造方法

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WO1997044173A1 (fr) * 1996-05-23 1997-11-27 Uponor B.V. Procede de fabrication de raccord de tuyauterie et raccord de tuyauterie
CN100411856C (zh) * 2006-09-29 2008-08-20 连云港中复连众复合材料集团有限公司 一种玻璃钢曲面模塑格栅的制作工艺
CN103498535A (zh) * 2013-09-29 2014-01-08 江苏法尔胜泓昇集团有限公司 碳纤维复合材料筋材扁平状截面锚固方法
EP2982871A4 (fr) * 2013-04-05 2016-11-16 Shikibo Ltd Couplage léger de matériau composite

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CA2773042A1 (fr) 2012-03-23 2013-09-23 Pultrall Inc. Tige courbee de renforcement ayant une resistance mecanique amelioree a l'endroit de sa courbure et methode pour produire celle-ci
AT514390A1 (de) * 2013-05-17 2014-12-15 Asamer Basaltic Fibers Gmbh Bewehrungsstab
US10843378B2 (en) 2017-05-15 2020-11-24 Morton Buildings, Inc. System and method for applying stress to a reinforcement member

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JPS61274036A (ja) * 1985-04-26 1986-12-04 ソシエテ・ナシヨナル・ド・ラミアント 構造用ロツドと強化構造部材
JPS6351014U (fr) * 1986-09-22 1988-04-06

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JPS61274036A (ja) * 1985-04-26 1986-12-04 ソシエテ・ナシヨナル・ド・ラミアント 構造用ロツドと強化構造部材
JPS6351014U (fr) * 1986-09-22 1988-04-06

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997044173A1 (fr) * 1996-05-23 1997-11-27 Uponor B.V. Procede de fabrication de raccord de tuyauterie et raccord de tuyauterie
US6258197B1 (en) 1996-05-23 2001-07-10 Uponor Innovation Ab Method for manufacturing pipe fitting, and pipe fitting
CN100411856C (zh) * 2006-09-29 2008-08-20 连云港中复连众复合材料集团有限公司 一种玻璃钢曲面模塑格栅的制作工艺
EP2982871A4 (fr) * 2013-04-05 2016-11-16 Shikibo Ltd Couplage léger de matériau composite
CN103498535A (zh) * 2013-09-29 2014-01-08 江苏法尔胜泓昇集团有限公司 碳纤维复合材料筋材扁平状截面锚固方法
CN103498535B (zh) * 2013-09-29 2016-02-17 江苏法尔胜泓昇集团有限公司 碳纤维复合材料筋材扁平状截面锚固方法

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