WO1999061725A1 - Procede pour reparer et renforcer une structure existante en beton et resine conçue a cet effet - Google Patents

Procede pour reparer et renforcer une structure existante en beton et resine conçue a cet effet Download PDF

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Publication number
WO1999061725A1
WO1999061725A1 PCT/JP1999/002756 JP9902756W WO9961725A1 WO 1999061725 A1 WO1999061725 A1 WO 1999061725A1 JP 9902756 W JP9902756 W JP 9902756W WO 9961725 A1 WO9961725 A1 WO 9961725A1
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WO
WIPO (PCT)
Prior art keywords
resin
reinforcing
sheet material
fiber sheet
concrete structure
Prior art date
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PCT/JP1999/002756
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English (en)
Japanese (ja)
Inventor
Masahiro Sugimori
Tomoo Sano
Yasushi Suzumura
Takuya Furukawa
Mikio Takasu
Shigetsugu Hayashi
Original Assignee
Mitsubishi Rayon Co., Ltd.
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
Application filed by Mitsubishi Rayon Co., Ltd. filed Critical Mitsubishi Rayon Co., Ltd.
Priority to EP99922484A priority Critical patent/EP1083274A4/fr
Priority to CA002333419A priority patent/CA2333419A1/fr
Publication of WO1999061725A1 publication Critical patent/WO1999061725A1/fr

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Classifications

    • 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
    • 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
    • E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
    • 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
    • E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
    • E04G2023/0251—Increasing or restoring the load-bearing capacity of building construction elements by using fiber reinforced plastic elements

Definitions

  • the present invention relates to a method for repairing and reinforcing an existing concrete structure such as a pier, a bridge, or a pillar of a building, and a resin used for the method.
  • the epoxy resin mainly used for impregnating the reinforced fiber sheet material generally requires several days or more even at room temperature to cure and develop sufficient strength, and when the temperature is further lowered to 5 ° C or less. Unless a special heating means is used, there is a problem that the curing hardly progresses and the period of the curing becomes extremely long.
  • a method of using a radical polymerizable resin that cures at a low curing temperature of 5 ° C and at a very low temperature of about 10 ° C as an impregnating resin is used.
  • a radical polymerizable resin that cures at a low curing temperature of 5 ° C and at a very low temperature of about 10 ° C as an impregnating resin is used.
  • Japanese Unexamined Patent Publication (A) Hei 9-184304, Hei 9-184405, Hei 10-775 Japanese Unexamined Patent Publication (A) Hei 9-184304, Hei 9-184405, Hei 10-775.
  • the means of using such a radical polymerization type resin as the impregnating resin is to combine with a reinforcing fiber sheet material in a form suitable for a radical polymerization type resin system in the first place.
  • the present inventors have conducted intensive studies to solve the above-mentioned problems, and as a result, by using an additional impregnating resin having a specific range of viscosity and curing time, the resin content developed as an impregnating resin with epoxy resin is 1%.
  • the present inventors have found that a sufficient reinforcing effect can be exhibited even when a reinforcing fiber sheet material of 5% by weight or less is used, and the present invention has been achieved.
  • the present invention relates to a reinforcing fiber sheet material having a resin content of 15% by weight or less, while impregnating a resin having a viscosity of 2.5 to 300 voids and a curing time of 1 to 24 hours with an existing resin.
  • the first point is to repair and reinforce existing concrete structures that are attached to the surface of concrete structures and hardened with resin.
  • the viscosity is 2.5 to 300 voise and the curing time is 1 to 24.
  • the second point is the method of repairing and reinforcing existing concrete structures that impregnate the resin for a certain amount of time and cure the resin.
  • the resin to be impregnated later into the reinforced fiber sheet material that is, a resin having a viscosity of 2.5 to 300 voids and a curing time of 1 to 24 hours
  • resin a resin having a viscosity of 2.5 to 300 voids and a curing time of 1 to 24 hours
  • the additional impregnated resin has a viscosity of 100 to 100 voids and a curing time of 2
  • a radically polymerizable resin of up to 12 hours is particularly desirable, and this is the third aspect.
  • a reinforcing fiber sheet material composed of reinforcing fibers and a resin having a limit of 15% by weight is preferably used in a repairing and reinforcing method using an epoxy resin as an impregnating resin. Is used.
  • the resin (matrix resin) constituting the reinforcing fiber sheet material is impregnated with the reinforcing fiber, or the reinforcing fiber aligned with the bow I or the woven reinforcing fiber is, for example, a release paper or a support. It may be an adhesive layer that adheres to the sheet.
  • the resin constituting the reinforcing fiber sheet material may be an uncured thermosetting resin or a polymerized thermoplastic resin, and is not particularly limited. Resins are commonly used. Of course, there is no problem even if the reinforcing fiber sheet material is specially manufactured according to the resin to be impregnated later (additional impregnating resin).
  • the resin constituting the reinforcing fiber sheet material has a solubility parameter (SP) value of 17 to 2 as described later. It is preferable to use a resin having 8 (MPa) 1/2 .
  • the amount of the matrix resin constituting the reinforcing fiber sheet material is 15% by weight or less.
  • the amount of the resin exceeds 15% by weight, it is not preferable because curing failure of the additional impregnated resin and deterioration of physical properties of the cured product are caused.
  • Reinforced fiber When the amount of the resin constituting the sheet material is 7% by weight or less, when the type of the resin constituting the reinforcing fiber sheet material is different from the type of the resin to be impregnated later, for example, the reinforcing fiber
  • the resin constituting the sheet material is an epoxy resin, which is particularly preferable even when the reinforced fiber sheet material is later impregnated with a radical polymerizable resin, since sufficient curability and strength of the cured product can be obtained.
  • the amount of resin constituting the reinforced fiber sheet material greatly affects the handleability of the reinforced fiber sheet material
  • the amount of the resin is preferably 1% by weight or more.
  • the reinforced fiber sheet material has a sufficiently low rigidity so that the resin that composes it can be attached to the existing concrete structure with a curvature, so that the resin constituting the material is uncured or along the attached place with the curvature.
  • the resin be cured in a suitable form.
  • the pot life (shelf life) at room temperature is long.
  • reinforcing fibers constituting the reinforcing fiber sheet material in the present invention fibers usually used as reinforcing fibers such as carbon fiber, aramide fiber and glass fiber are preferably mentioned. Among them, carbon fiber is preferable.
  • a high-strength carbon fiber having a tensile strength of 400 OMPa or more is particularly preferable when utilizing the strength, and a high elasticity having an elastic modulus of 250 GPa or more when using the elastic modulus. Carbon fibers are more preferred.
  • a compound having a radical polymerizable functional group at at least one end is used as a sizing agent. It is particularly preferable to use the carbon fiber used as the material in view of the strength development of the cured product.
  • the reinforcing form in the reinforcing fiber sheet material is not limited at all, and examples include a method in which reinforcing fibers are aligned in one direction or formed into a woven sheet.
  • the basis weight of the reinforcing fiber is preferably 150 g Zm 2 or more.
  • Examples of the form more preferably used as the reinforcing fiber sheet material used in the present invention include Japanese Patent Application Laid-Open Publications (A) Hei 3-2224901, Hei 3-222 734, Hei 5 As described in No. 3 804, No. 7-364 777, and No. 7-2 287 14, the following forms (1) to (3) are preferable .
  • the support sheet a nonwoven fabric of fibers of various polymers such as glass fiber woven fabric, glass scrim cloth, glass fiber paper, glass fiber nonwoven fabric, polyamide, and polyphenylene sulfide is used.
  • the adhesive may be any as long as it can at least temporarily adhere the reinforcing fibers to the support, and is preferably a resin having good compatibility with the matrix resin of the reinforcing fiber sheet material.
  • the matrix resin is an epoxy resin
  • an epoxy adhesive is preferred.
  • the reinforcing fiber sheet material used in the present invention is not limited to the above-described reinforcing fiber sheet material.
  • the reinforcing fiber sheet is used after reinforcing fibers are aligned in one direction, or after manufacturing.
  • a resin in which the resin constituting the material is applied in a linear or dot shape to maintain the form, and a resin in which the above-mentioned support sheet is further bonded thereto can be applied.
  • the reinforcing fiber sheet material is impregnated with a curable resin at the same time as or after attaching the reinforcing fiber sheet material to the surface of the existing structure.
  • the additional impregnated resin may be a resin having a viscosity of 2.5 to 300 vois and a curing time of 1 to 24 hours, which may be repaired and reinforced using the above-mentioned reinforcing fiber sheet material. It is necessary to enhance the effect.
  • the viscosity of the resin to be impregnated here is the viscosity measured at the construction temperature using a B-type viscometer.
  • the resin to be impregnated is a radical polymerization type resin
  • the viscosity is before addition of an organic peroxide or the like serving as a polymerization initiator.
  • the viscosity of this resin exceeds 300 voids, it becomes difficult to impregnate the reinforcing fiber sheet material with the resin.On the contrary, when the viscosity is less than 2.5 voids, the combination with the above-mentioned reinforcing fiber sheet material becomes difficult.
  • the reinforcing fibers tend to move, causing a reduction in the reinforcing effect. More preferably, the lower limit of the viscosity is 100 voids and the upper limit is 100 voids.
  • the curing time in the present invention is a time from the start of curing of the resin to a time when the tackiness is eliminated by touch with a finger, and when a resin having a curing time of less than 1 hour is used, the development of strength is poor. Conversely, a resin having a curing time exceeding 24 hours is too long for the purpose of the present invention because the curing time is too long.
  • the lower limit of the curing time is more preferably 2 hours or more, and the upper limit is more preferably within 12 hours, most preferably within 8 hours.
  • a resin that satisfies the requirements of the viscosity and the curing time described above is preferable, and among them, a thermosetting resin is preferable, and a room temperature curable resin is particularly preferable.
  • a radical polymerizable resin is particularly preferable, and a radical polymerizable resin composed of a radical polymerizable monomer or oligomer having a methacryl group or an acryloyl group as a terminal reactive group is cured. It is particularly preferable from the viewpoint of the balance between the properties and the properties of the cured product.
  • the terminal reactive group may be a composition containing a monomer other than a methyl group or an acryloyl group, for example, styrene.
  • Radical polymerizable monomers include acrylates such as methyl acrylate and ethyl acrylate, methyl methacrylate, 2-ethylhexyl methacrylate, hydroxyethyl methacrylate, and tetrahydrofurfuryl methacrylate.
  • acrylates and methacrylates are particularly preferred in terms of curability and strength.
  • the radical polymerizable monomer in the present invention is preferably a monomer that is compatible with the resin adhering to the reinforcing fiber sheet to some extent, the solubility parameter of the radical polymerizable monomer has an SP value of 17 to 2 Those having a range of 2 (MP a) 2 are particularly preferred.
  • polymerizable oligomers include acrylic acid, methacrylic acid, etc. at the ends of oligomers obtained by the reaction of polybasic acids such as fluoric acid and adipic acid with polyhydric alcohols such as ethylene dalicol and butanediol.
  • acrylic acid-containing polyester poly (meth) acrylates obtained by reaction with acrylic acid, polybasic acids and polyhydric alcohols
  • An aryl group-containing polyester obtained by a reaction with an aryl ether group-containing alcohol, an epoxy poly (meth) acrylate obtained by a reaction of an epoxy resin with (meth) acrylic acid, a polyol and a polyisocyanate, and a hydroxyl group-containing (meth)
  • examples thereof include, but are not limited to, urethane poly (meth) acrylate obtained by a reaction with acrylate.
  • the molecular weight of the radically polymerizable oligomer used in the present invention is not particularly limited, but it is more preferably 1000 or less in terms of number average molecular weight from the viewpoint of curability at low temperatures.
  • an elastomer component having a reactive functional group at the terminal is added to the cured product.
  • the mixing ratio of the monomer and the oligomer in the resin for impregnation used in the present invention is not particularly limited as long as the viscosity and curing time of the composition are satisfied.
  • initiators for initiating the polymerization of these radically polymerizable monomers and oligomers commonly used curing agent systems, for example, peroxides and metal accelerators and curing accelerators such as tertiary amines are used. Examples thereof include redox catalysts and the like.
  • the combination is selected and used such that the curing time is 1 hour or more, 24 hours or less, preferably 12 hours or less.
  • the polymer added instead of or in addition to the oligomer of the resin for impregnation is added for the purpose of adjusting the viscosity of the composition and improving the toughness and durability of the cured product.
  • Preferred polymers include elastomeric polymers such as acrylic polymers, acrylonitrile rubber rubbers, acrylic rubbers, styrene block polymers, and urethane elastomers. However, it is not limited to this.
  • the amount of the polymer to be added is not particularly limited as long as it satisfies the restrictions on the viscosity and curing time of the composition, but is preferably 50% by weight or less in many cases.
  • radical polymerizable monomer and the non-reactive polymer be the main components, since the resin viscosity can be appropriately controlled.
  • a radical polymerizable monomer and a radical polymerizable oligomer having a number average molecular weight of 1,000 or less and a non-reactive polymer are the main components, the reactivity of the resin and the resin viscosity can be appropriately controlled. preferable.
  • the radically polymerizable resin in the present invention includes, in addition to the above-mentioned monomers, oligomers, polymers, and curing agent components, a thixotropic agent, an air-curing agent, a coupling agent, a polymerization inhibitor, and a coloring agent according to the purpose.
  • a thixotropy-imparting agent examples include finely divided silica such as "Varodil 200" manufactured by Nippon Aerosil Co., Ltd. and “Nibusir LP” manufactured by Nippon Silica Industry Co., Ltd .; Organic powders such as finely divided calcium carbonate such as "Shirarenka CC" manufactured by Maruo Calcium Co., Ltd.
  • the amount used is less than 10% by weight, usually less than 5% by weight.
  • the air curing agent include paraffin wax represented by n-paraffin, higher fatty acids such as polyethylene wax and stearic acid, and glycidyl methacrylate, aryl glycidyl ether and the like.
  • the addition amount of these air-curing agents is suitably from 0.1 to 10% by weight based on the resin to be impregnated, and if it is less than 0.1% by weight, sufficient air-curing properties cannot be obtained. If the content exceeds 10% by weight, the physical properties of the cured product tend to decrease.
  • the range is particularly preferably 0.1 to 5% by weight based on the resin to be impregnated.
  • the resin used in the present invention may be, if necessary, a silane coupling agent typified by acryloxypropyltrimethoxysilane, a titanate coupling agent, a zirconate coupling agent, an organic aluminum coupling.
  • a power coupling agent such as an agent can be used alone or as a mixture.
  • An appropriate amount of addition is 0.5 to 5 parts by weight based on 100 parts by weight of the resin to be impregnated.
  • the resin used in the present invention contains an appropriate amount of a polymerization inhibitor in order to secure stability at the distribution stage. Further, a coloring agent, a pigment, an antifoaming agent, and the like can be added as needed.
  • the amount of the additional impregnating resin impregnated into the reinforcing fiber sheet material is not particularly limited as long as the reinforcing fiber sheet and the additional impregnating resin become an integrated composite material after impregnation.
  • the reinforced fiber sheet material is impregnated with a resin and is attached to the surface of an existing concrete structure to cure the resin, or the reinforced fiber sheet material is coated on the surface of the existing concrete structure. Can be carried out by impregnating with a resin and curing the resin. At this time, before attaching the reinforcing fiber sheet material The resin to be impregnated later may be preliminarily applied to the sticking place.
  • the surface of the existing concrete structure to which the reinforcing fiber sheet material is to be attached must be smoothed using a grinder or the like to remove irregularities, steps, defects, cracks, etc. It is preferable to correct by filling in from the viewpoint of improving the bonding strength.
  • the primer resin On the surface of the existing concrete structure to which the reinforcing fiber sheet material is to be attached, apply the appropriate amount of primer resin to the surface of the concrete by known means, such as brushing with a roller or spraying, if necessary, after removing the above irregularities. It is preferable to use a resin of the same type as the impregnating resin used later for attaching the reinforcing fiber sheet material. It is preferable that the primer resin has a low viscosity from the viewpoint of adhesiveness to concrete and workability, and the primer resin is a composition that hardens more quickly, for example, a composition that cures in about one hour. Such a primer resin is used by mixing a curing agent and a curing accelerator immediately before use.
  • acrylic primer resin examples include, but are not limited to, “Acrycillap DR-80” manufactured by Mitsubishi Rayon Co., Ltd.
  • the resin to be impregnated is used by mixing a curing agent and a curing accelerator immediately before use so that a predetermined curing time can be obtained.
  • the additional impregnated resin is applied to the surface of an existing concrete structure to which the primer resin has been applied, and the reinforced fiber sheet material is adhered thereon, and then The additional impregnated resin is applied to the reinforcing fiber sheet material while extruding the air contained in the sheet by, for example, applying a defoaming hole to the air through a defoaming port.
  • the required number of reinforcing fiber sheet materials can be attached while changing the fiber direction, thereby forming a repair reinforcing layer using a reinforcing fiber sheet.
  • bisphenol A type epoxy resin ("Epico 1004" manufactured by Yuka Shell Epoxy Co., Ltd.) 1943 parts by weight, 86 parts by weight of methacrylic acid, 40 parts by weight of dimethylaminoethyl methacrylate, 2 parts by weight of hydroquinone monomethyl ether And 1227 parts by weight of methyl methacrylate, and the reaction temperature was raised to 9 O. The reaction was continued until the acid value became 8 (mgKOH / g) or less, to obtain an oligomer 1 containing 50% by weight of methyl methacrylate. Was. The number-average molecular weight of the composition obtained by removing the monomer component of the obtained oligomer 1 was 2,000.
  • Epoxy ester (“3002M” manufactured by Kyoei Yushi Kagaku Kogyo Co., Ltd.) whose main component is bisphenol A derivative with methacrylic group at the end 1 wt% the deposited carbon fiber (manufactured by Mitsubishi Rayon Co., Ltd. "TR50") (tensile strength of 490 OMP a) a aligned in one direction so that the weight of the carbon fibers per 1 m 2 is 300 g, the curing agent 15 g per lm 2 of an epoxy resin composition containing no resin ("Base resin for # 350" manufactured by Mitsubishi Rayon Co., Ltd., SP value: 23), and then impregnated with a thickness of 25 ⁇ m as a support. Was bonded to obtain a reinforced fiber sheet material 1.
  • the reinforcing fiber sheet material 1 was impregnated with the above impregnated resin so that the amount of resin per lm 2 was approximately 400 g, and was left to cure at 25 ° C. After 2 hours, the resin disappeared from the surface and hardened.
  • a sample for a tensile test was prepared from the cured reinforcing fiber sheet material, and the tensile strength in the carbon fiber direction was measured.
  • the average tensile strength of this composite was 410 OMPa in terms of 100% of carbon fiber.
  • an acrylic primer resin ("Acrylic Wrap DR-80" manufactured by Mitsubishi Rayon Co., Ltd.) was applied to the surface of a concrete sample conforming to JIS (Japanese Industrial Standards) A-1132 at 25 ° C with a brush. after coating at a rate of lm 2 per 200 g, it was adhered reinforcing fiber sheet material 1 in the same manner as described above in concrete surfaces. After curing for one day, a tensile test was performed in accordance with JIS-A-6909. The strength was 2.4 MPa and the failure mode was material failure inside the concrete.
  • oligomer 1 The above-mentioned oligomer 1 and an epoxy-based oligomer ("Epoxyester 3000M” manufactured by Kyoeisha Chemical Co., Ltd .; hereinafter, referred to as oligomer 2) were used in combination as the oligomer, and the ratio was changed as shown in Table 1 except that the ratio of each component was changed as shown in Table 1. The procedure was the same as in Example 1. Table 1 shows the evaluation results.
  • Example 4 The operation was performed in the same manner as in Example 2 except that the amount of the curing accelerator used was halved. Table 1 shows the evaluation results. (Example 4)
  • bisphenol A type epoxy resin (Epicoat 1004" manufactured by Yuka Shell Epoxy Co., Ltd.) 58 3 parts by weight, acrylic acid 43 parts by weight, dimethylaminoethyl methyl
  • Add 6.2 parts by weight of acrylate, 0.62 parts by weight of hydroquinone monomethyl ether, and 633 parts by weight of methyl methacrylate raise the reaction temperature to 90 ° C, and reduce the acid value to 5 (mg KOH / g) or less.
  • the reaction was continued until the reaction was completed to obtain an oligomer 3 containing 50% by weight of methyl methacrylate.
  • the number average molecular weight of the composition obtained by removing the monomer component of the obtained oligomer 3 was 2,300.
  • Example 1 The same operation as in Example 1 was carried out except that oligomer 3 was used instead of oligomer 1 as an oligomer component and the ratio of each component was changed as shown in Table 1. Table 1 shows the evaluation results.
  • Example 1 was repeated except that an acrylic resin ("Dianal BR-83" manufactured by Mitsubishi Renyon Co., Ltd.) was used instead of Oligomer 1 and the ratio of each component was changed as shown in Table 1. The same operation was performed. Table 1 shows the evaluation results.
  • Example 5 The same operation as in Example 5 was carried out except that the amount of the curing accelerator used was halved. Table 1 shows the evaluation results.
  • the monomer component and the oligomer component were mixed at the ratios shown in Table 1 to prepare a resin composition having a viscosity of 2 voids at 25 ° C. before mixing the initiator, and the same operation as in Example 1 was performed. It is shown in Table 1.
  • the curability of the impregnated resin was extremely good, and the adhesion to the concrete was good, but the tensile strength of the composite was insufficient at 3720 MPa.
  • Example 7 Using the same impregnating resin as in Comparative Example 1, the test was performed by changing the sample preparation temperature to 5 ° C. and ⁇ 10 ° C., respectively.
  • the amount of the curing accelerator was changed as shown in Table 1 so that the curing time was 5 hours.
  • the viscosity of the composition at 5 ° C. was 15 boise, and the viscosity at —10: was 45 boise.
  • the curing agent of the resin composition used in Comparative Example 1 was changed so that the curing time was 30 minutes.
  • the evaluation results are shown in Table 1, but the tensile strength of the composite was further reduced.
  • the monomer component and the polymer component were mixed in the ratio shown in Table 1 to prepare a resin composition having a viscosity of 400 vise at 25 ° C, and the same test was carried out. The subsequent evaluation could not be carried out due to the difficulty of impregnating the resin with the resin.
  • Bisphenol ⁇ type epoxy resin (“Epicoat 828” manufactured by Yuka Shell Epoxy Co., Ltd.) 60 parts by weight, trimethylolpropane triglycidyl ether
  • the epoxy resin composition was impregnated into the reinforcing fiber sheet used in Example 1 to prepare a composite tensile test piece. When the resin was left for 12 hours, it did not stick, but required 7 days to develop sufficient strength and elasticity. The tensile strength evaluated after 7 days was 420 OMPa.
  • vinyl ester resin (“Lipoxy R — 840” manufactured by Showa Polymer Co., Ltd., viscosity at 25 ° C. 25 Boys, SP value: 19) 100 parts by weight, curing catalyst (CH Showa Polymer Co., Ltd.) 1), Naphthene as a curing accelerator
  • curing catalyst CH Showa Polymer Co., Ltd.
  • Naphthene as a curing accelerator
  • Curing time at 25 ° C was 3 hours. Six hours after the resin was impregnated with the reinforcing fiber sheet material, the surface tack had completely disappeared, and the tensile strength of the composite was 402 OMPa.
  • Example 9 The same operation as in Example 9 was carried out except that 2 parts by weight of methyl ethyl peroxide as a curing agent and 1 part by weight of cobalt naphthenate as a curing accelerator were used per 100 parts by weight of the resin.
  • the curing time at 25 ° C. was 1 hour, and the tensile strength of the obtained composite after 6 hours was 300 OMPa.
  • the test was performed in the same manner as in Example 7 except that an n-butyl acrylate oligomer having a methacryl group at one end and a number average molecular weight of 6000 was used instead of phenoxyethylene glycol acrylate. .
  • the viscosity of the resin at 5 ° C. was 5 boys.
  • the surface of the prepared sample had no tackiness after 6 hours, and the composition had good low-temperature curability.
  • the tensile strength of the composite was 4100 MPa, and the failure mode in the adhesion test was material failure of concrete.
  • reinforced fiber was used in the same manner as in Example 1 except that "Conwood Net ON 5050" (basis weight Y gZm 2 ) manufactured by Nisseki Palette System Co., Ltd. was used instead of "Scrim Cloth” manufactured by Nitto Boseki Co., Ltd. Sheet 2 was created.
  • the same operation as in Example 3 was performed by combining this reinforcing fiber sheet material with the resin used in Example 3.
  • the tensile strength of the obtained composite was 4,300 MPa, a value indicating sufficient strength development.
  • Example 3 As the carbon fiber, a high elasticity carbon fiber having an elastic modulus of 392 GPa ("HR40" manufactured by Mitsubishi Rayon Co., Ltd., tensile strength 4610MPa) is used. Except for using the resin composition used in Example 3, the same as in Example 1
  • the tensile strength of the bird was evaluated.
  • the obtained tensile strength was 4.50 MPa, a value indicating sufficient strength development.
  • repair and reinforcement of existing concrete structures for example, piers and buildings, etc.
  • existing reinforcing fiber sheet materials can be effectively used.

Abstract

L'invention concerne un procédé pour réparer et renforcer une structure existante en béton telle qu'un pont, un quai ou un immeuble. Le procédé consiste à coller à la surface de la structure en béton un matériau fibreux de renforcement en forme de feuilles dont la teneur en résine est inférieure ou égale à 15 % en poids et à imprégner ledit matériau en feuilles avec une résine possédant une viscosité d'environ 2, 5-3000 poise et un temps de durcissement de 1 à 24 h; et à laisser durcir la résine. Le procédé permet de réparer une structure existante en béton et à la renforcer pour lui conférer une meilleure résistance assez rapidement et aisément sans subir d'influence notable des conditions de température lors des travaux de réparation et de renforcement.
PCT/JP1999/002756 1998-05-26 1999-05-26 Procede pour reparer et renforcer une structure existante en beton et resine conçue a cet effet WO1999061725A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP99922484A EP1083274A4 (fr) 1998-05-26 1999-05-26 Procede pour reparer et renforcer une structure existante en beton et resine con ue a cet effet
CA002333419A CA2333419A1 (fr) 1998-05-26 1999-05-26 Procede pour reparer et renforcer une structure existante en beton et resine concue a cet effet

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP10/144249 1998-05-26
JP14424998 1998-05-26

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WO1999061725A1 true WO1999061725A1 (fr) 1999-12-02

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EP (1) EP1083274A4 (fr)
KR (1) KR100429959B1 (fr)
CA (1) CA2333419A1 (fr)
TW (1) TW508401B (fr)
WO (1) WO1999061725A1 (fr)

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KR20030023901A (ko) * 2001-09-14 2003-03-26 주식회사 제트화이버코리아 콘크리트 구조물의 보수보강방법
JP2004107944A (ja) * 2002-09-17 2004-04-08 Konishi Co Ltd 鋼製構造物の補強方法
JP2018188557A (ja) * 2017-05-08 2018-11-29 ショーボンド建設株式会社 接着剤注入工法及び接着剤

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CA2333419A1 (fr) 1999-12-02
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KR100429959B1 (ko) 2004-05-03
EP1083274A1 (fr) 2001-03-14

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