JP2017119995A - Viscous article for concrete structure exfoliation prevention, and construction method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a viscous article for concrete structure exfoliation prevention which can be constructed in a short time relatively to a conventional construction method and is capable of further improving an exfoliation prevention performance of concrete pieces, and a construction method therefor.SOLUTION: A construction method for a viscous article for preventing exfoliation of a concrete structure includes the step of directly applying a viscous article to a concrete structure. The viscous article includes: an adhesive layer containing viscous acryl polymers and inorganic particulates; and a fiber sheet that is disposed within the adhesive layer. In the viscous article, the adhesive layers exist on both principal planes of the article.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to a pressure-sensitive adhesive article for preventing a concrete structure from peeling off, and a construction method thereof.

  Conventionally, in order to prevent the peeling of concrete pieces from concrete structures such as bridges, tunnels, and elevated roads, a method of applying a coating agent for preventing concrete peeling to the concrete structure surface has been used.

  In Patent Document 1 (Japanese Patent No. 4347757), “the total number of yarns per axis is 300 to 10,000 decitex synthetic fibers, glass fibers, or carbon fibers formed from two to four axes. A mesh woven fabric having a mesh of 2 to 20 mm is coated or impregnated with an ethylene-vinyl acetate copolymer emulsion or an acrylic resin emulsion, and one side is coated with either an acrylic or rubber-based pressure-sensitive adhesive. It is described that a “mesh-like fabric for preventing concrete exfoliation formed by forming an agent layer” is applied to a concrete structure.

  Patent Document 2 (Japanese Patent Application Laid-Open No. 2004-027718) discloses that “a protective layer and an adhesive coating layer composed of a reinforcing layer and / or a sticking layer are bonded together and the adhesive coating layer is bonded to a concrete structure. It describes that a concrete structure repair / reinforcement / deterioration prevention sheet "in which an adhesive layer made of an adhesive or a hot melt adhesive is formed is applied to a concrete structure.

Japanese Patent No. 4347757 JP 2004-027718 A

  In the conventional method, the reinforcing fiber layer is applied after the adhesive is applied to the surface of the concrete structure, or after applying the adhesive applied to one side of the reinforcing fiber layer to the surface of the concrete structure, It is necessary to further apply a surface treatment agent to the other surface of the reinforcing fiber layer, and a simpler construction method has been desired.

  Moreover, since the peeling of concrete pieces from concrete structures such as bridges, tunnels, and elevated roads may lead to accidents, further improvement in the ability to prevent the peeling of concrete pieces has been desired.

  In view of the above problems, the present disclosure can be applied in a shorter time than conventional construction methods, and can further improve the anti-peeling performance of concrete pieces. Provide construction methods.

  According to an embodiment of the present disclosure, there is provided an adhesive article including an adhesive layer containing an adhesive acrylic polymer and inorganic fine particles, and a fiber sheet disposed in the adhesive layer, both of the articles There is provided a method for constructing an adhesive article that prevents the concrete structure from peeling off, comprising a step of directly applying an adhesive article having an adhesive layer on a main surface to the concrete structure.

  According to another embodiment of the present disclosure, a step of applying a surface treatment agent to a concrete structure to form a surface treatment layer, a pressure-sensitive adhesive layer containing a pressure-sensitive acrylic polymer and inorganic fine particles, and the pressure-sensitive adhesive layer A pressure-sensitive adhesive article comprising a fiber sheet disposed therein, wherein the pressure-sensitive adhesive article is present on both main surfaces of the article, and the adhesive article is directly applied to the surface treatment layer. A method for constructing an adhesive article that prevents the concrete structure from peeling off is provided.

  According to still another embodiment of the present disclosure, an adhesive article comprising an adhesive layer containing an adhesive acrylic polymer and inorganic fine particles, and a fiber sheet disposed in the adhesive layer, the article There is provided a pressure-sensitive adhesive article used in the above construction method, wherein pressure-sensitive adhesive layers are present on both main surfaces.

  The method for constructing an adhesive article for preventing peeling of a concrete structure according to the present disclosure is an adhesive article in which a fiber sheet is disposed in an adhesive layer, and the adhesive layer exists on both main surfaces of the article. Therefore, since the adhesive article integrated with the concrete structure can be directly applied at once, the work can be completed in a shorter time than the conventional construction method that requires an application means at the time of construction.

  Since the pressure-sensitive adhesive article of the present disclosure employs a pressure-sensitive adhesive containing a pressure-sensitive acrylic polymer and inorganic fine particles, it can improve the stripping prevention performance of concrete pieces compared to conventional products.

  The above description should not be construed as disclosing all embodiments of the invention and all advantages related to the invention.

It is a perspective view of the adhesive article of one embodiment of this indication. It is sectional drawing of the concrete structure to which the adhesive article of FIG. 1 is applied. It is sectional drawing of the adhesive article of the other embodiment of this indication. It is a side view of a punching test apparatus. It is a front view of a punching test apparatus.

  Hereinafter, the present invention will be described in more detail for the purpose of illustrating representative embodiments of the present invention, but the present invention is not limited to these embodiments.

  An adhesive article according to an embodiment of the present disclosure is an adhesive article including an adhesive layer containing an adhesive acrylic polymer and inorganic fine particles, and a fiber sheet disposed in the adhesive layer. There are pressure-sensitive adhesive layers on both main surfaces.

  An adhesive article according to an embodiment of the present disclosure is shown in a perspective view in FIG. 1, and a concrete structure to which the adhesive article is applied is shown in a sectional view in FIG. 2. As shown in FIGS. 1 and 2, the adhesive article 1 includes an adhesive layer 2 and a fiber sheet 3 arranged in the adhesive layer 2.

The pressure-sensitive adhesive layer 2 contains a pressure-sensitive acrylic polymer from the viewpoint of excellent peeling resistance of concrete pieces. Here, “stickiness” means that the storage elastic modulus (G ′) measured at 10 radians / second at an application temperature (which can be measured at 20 ° C. to 22 ° C.) is less than 3 × 10 ⁵ Pascals. Means (Darquist standard). “Polymer” refers to the definition of “Polymer” by the IUPAC Polymer Nomenclature Committee (http://main.spsj.or.jp/c19/iupac/Recommendations/glossary36.html) .

  The adhesive acrylic polymer is, for example, copolymerized with a first monomer composed of at least one (meth) acrylic acid ester of a non-tertiary alcohol having an alkyl group with 4 to 20 carbon atoms, and the first monomer. It may be a polymer obtained by polymerizing the second monomer. However, the second monomer is a monomer different from the first monomer. Here, “(meth) acryl” refers to acryl or methacryl (sometimes referred to as methacryl), and similar compounds have the same meaning.

  The first monomer may be a monomer that gives a polymer having a glass transition temperature of 0 ° C. or lower when homopolymerized. Here, the glass transition temperature refers to the temperature at the peak position of tan δ in dynamic viscoelasticity measurement (frequency can be 1.0 Hz, heating rate can be 5 ° C./min) (the same applies hereinafter). The first monomer may be a monofunctional (meth) acrylic acid ester of a non-tertiary alkyl alcohol in which the alkyl group has 4 to 20 or 4 to 18 carbon atoms. Examples of first monomers include n-butyl acrylate, n-hexyl acrylate, n-octyl acrylate, isooctyl acrylate, 2-ethylhexyl acrylate, isononyl acrylate, n-decyl acrylate, n-dodecyl acrylate, octadecyl acrylate and These mixtures are mentioned.

  The second monomer may be a monomer having at least one ethylenically unsaturated group and giving a polymer having a glass transition temperature exceeding 0 ° C. when homopolymerized. Examples of the second monomer include (meth) acrylic acid, N-vinyl pyrrolidone, N-vinyl caprolactam, substituted (meth) acrylamide such as N, N-dimethylacrylamide, acrylonitrile, isobornyl acrylate, alkyl group carbon Examples include acrylates of alcohols having a number of 1 to 3, carboxyethyl acrylate, and mixtures thereof. From the viewpoint of peeling prevention, the second monomer is preferably (meth) acrylic acid, N, N-dimethylacrylamide, or isobornyl acrylate. When a basic monomer such as substituted (meth) acrylamide is used as the second monomer, a weakly basic tertiary amine compound or the like can be used.

  Regarding the mass ratio of the first monomer to the second monomer (first monomer / second monomer), the first monomer is used from the viewpoint of the balance between the initial adhesive strength at low temperature and the static shear strength at high temperature. Is 50 parts by mass or more, 60 parts by mass or more, or 70 parts by mass or more, 100 parts by mass or less, and the second monomer is 0 parts by mass or more, 2 parts by mass or more, or 5 parts by mass or more, 50 parts by mass or less, 40 parts by mass. Or less, or 30 parts by mass or less.

  The content of the adhesive acrylic polymer is, for example, 50% by mass or more, 70% by mass or more, or 90% by mass or more, 99% by mass or less, 97% by mass or less, or 95% by mass, based on the total amount of the adhesive layer 2. It may be the following.

  The pressure-sensitive adhesive layer 2 further contains inorganic fine particles from the viewpoint that the concrete structure can be suitably reinforced, that is, the concrete piece can be prevented from being peeled off and the water resistance can be improved. The inorganic fine particles may be, for example, silica fine particles or mineral fine particles. The inorganic fine particles may be either solid fine particles or hollow fine particles. The shape of the inorganic fine particles is not limited to a spherical shape, and an irregular shape such as a flat shape can also be used.

  From the viewpoint of the reinforcing effect of the adhesive article, the inorganic fine particles have a particle diameter (median diameter, the same applies hereinafter) having a particle diameter of 1 μm or more, 5 μm or more, or 10 μm or more, 500 μm or less, 300 μm or less, or 100 μm or less. It is preferable to contain fine particles.

  The content of the first inorganic fine particles is 0.1 parts by mass or more, 1 part by mass or more, or 3 parts by mass or more with respect to 100 parts by mass of the adhesive acrylic polymer from the viewpoint of the reinforcing effect of the adhesive article. It is preferably not more than part by mass, not more than 18 parts by mass, or not more than 15 parts by mass.

  From the viewpoint of suitably reinforcing the concrete structure and ensuring the dispersibility of the first inorganic fine particles in the pressure-sensitive adhesive layer 2, the inorganic fine particles are 0.0001 μm or more, 0.001 μm or more, or 0.005 μm or more, It is preferable to further include second inorganic fine particles having a particle diameter of 1 μm or less, 0.1 μm or less, or 0.05 μm or less. In this case, regarding the mass ratio of the first inorganic fine particles to the second inorganic fine particles (first inorganic fine particles / second inorganic fine particles), for example, the first inorganic fine particles are 1 part by mass or more and 3 parts by mass or more. Or 5 parts by mass or more, 100 parts by mass or less, 20 parts by mass or less, or 10 parts by mass or less, and the second inorganic fine particles are 0 parts by mass or more, 0.5 parts by mass or more, or 1 part by mass or more. 50 parts by mass or less, 10 parts by mass or less, or 5 parts by mass or less.

  As the first inorganic fine particles, for example, K15 manufactured by 3M Company and Microsphere M-600 manufactured by Matsumoto Yushi Co., Ltd. can be used. As the second inorganic fine particles, for example, A-200 and R-972 manufactured by Nippon Aerosil Co., Ltd. can be used.

  The pressure-sensitive adhesive layer 2 may further contain a tackifier. Examples of the tackifier include hydrocarbon resins, terpene phenol resins, rosin resins, rosin ester resins, and hydrides thereof. Examples of available tackifiers include RegalrezTM 1085, RegalrezTM 1094, RegalrezTM 6108 and GegalrezTM 3102 manufactured by Eastman Chemical Japan, Arkon P-140 manufactured by Arakawa Chemical Industries, Ltd., and the like.

  As for content of a tackifier, 10 mass parts or less or 5 mass parts or less are preferable with respect to 100 mass parts of adhesive acrylic polymers. Content of a tackifier may be 0.5 mass part or more with respect to 100 mass parts of adhesive acrylic polymers, for example.

  In addition to the components described above, the pressure-sensitive adhesive layer 2 further includes known additives used for pressure-sensitive adhesives such as polymerization initiators, crosslinking agents, plasticizers, fillers, anti-aging agents, ultraviolet absorbers, and dyes. You may contain.

  The thickness of the pressure-sensitive adhesive layer 2 (thickness including the fiber sheet 3) may be, for example, 50 μm or more, 70 μm or more, 100 μm or more, or 200 μm or more, 3000 μm or less, 1000 μm or less, 600 μm or less, or 400 μm or less.

  The fiber sheet 3 is formed of a plurality of fibers 3a crossing each other. Specifically, in the fiber sheet 3, the plurality of fibers 3 a intersect each other in two or more directions or in a randomly oriented state, and the fibers 3 a are bonded by one or more of entanglement, fusion, and adhesion at the intersection. Has been. Such a fiber sheet 3 may be, for example, a woven fabric, a knitted fabric, or a non-woven fabric. The woven fabric / knitted fabric here is a multiaxial woven fabric / knitted fabric such as a biaxial woven fabric / knitted fabric or a triaxial woven fabric / knitted fabric in which a plurality of fibers are oriented in two or more directions. In the adhesive article 1 shown in FIGS. 1 and 2, the fiber sheet 3 is a biaxial woven fabric in which a plurality of fibers 3a are woven together in a state of being arranged in two directions (substantially orthogonal directions).

  The fiber 3a may be either a monofilament or a multifilament. The fiber 3a may be formed of, for example, at least one of glass, vinylon, and aramid, and is preferably formed of glass from the viewpoint of tensile elasticity, and preferably vinylon and from the viewpoint of compatibility with the pressure-sensitive adhesive. / Or formed of aramid. The thickness of the fiber 3a may be, for example, 10 tex or more, 20 tex or more, or 40 tex or more, 100 tex or less, 90 tex or less, or 80 tex or less.

  The fiber sheet 3 is preferably a biaxial woven fabric or a triaxial woven fabric from the viewpoint of suitably reinforcing the concrete structure, and more preferably a biaxial woven fabric or triaxial in which the fibers 3a are sealed by fusion or adhesion. It is a woven fabric. The weaving method of the biaxial woven fabric or the triaxial woven fabric may be, for example, plain weave, twill weave, satin weave, leno weave, or imitation weave.

  The thickness of the fiber sheet 3 may be, for example, 10 μm or more, 20 μm or more, 30 μm or more, 50 μm or more, or 100 μm or more, 2000 μm or less, 1000 μm or less, 500 μm or less, 400 μm or less, or 300 μm or less. Further, the density of the fibers 3a in the fiber sheet 3 is 1/25 mm or more, 2/25 mm or more, or 3/25 mm or more, from the viewpoint of being able to follow the deformation while suitably reinforcing the concrete structure. The number is 25/25 mm or less, 7/25 mm or less, or 5/25 mm or less. The tensile strength of the fiber sheet is preferably 500 N / 25 mm or more, 750 N / 25 mm or more, or 1000 N / 25 mm or more and 2500 N / 25 mm or less.

  As an example of such a fiber sheet 3, L160MA100LF manufactured by Unitika Ltd. is available.

  Such a fiber sheet 3 is disposed in the pressure-sensitive adhesive layer 2. That is, the pressure-sensitive adhesive layer 2 is present on both main surfaces of the fiber sheet 3, and both main surfaces of the fiber sheet 3 are not exposed. Further, as shown in FIG. 2, voids generated between the plurality of fibers 3 a forming the fiber sheet 3 are filled with the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 2. Since the movement of the fibers is suppressed by filling the gaps between the fibers with the adhesive, it is possible to further improve the stripping prevention performance of the concrete pieces.

  At least one of the thicknesses (shortest distances) between the main surface of the fiber sheet 3 and both main surfaces of the pressure-sensitive adhesive layer 2 is 100 μm or less, 80 μm or less, or 50 μm or less, 1 μm or more, 5 μm or more, or 50 μm. The above is preferable. In this case, the concrete structure can be suitably reinforced by bonding the main surface of the pressure-sensitive adhesive layer 2 whose shortest distance to the main surface of the fiber sheet 3 is not more than the predetermined value to the concrete structure.

  FIG. 3 is a cross-sectional view showing another embodiment of the adhesive article. As shown in FIG. 3, the adhesive article 11 may further include a base material 5 on one surface side of the adhesive layer 2.

  The substrate 5 may be, for example, a film, a sheet made of a foam material, a nonwoven fabric, a honeycomb structure, and a combination thereof. The substrate 5 is weather resistant, antifouling, waterproof, salt-insulating, and the like. It may be a material that functions as a protective layer, a sound-absorbing material, or the like that can provide the above performance. The film may be, for example, a polyethylene film, a polypropylene film, a polyester film, a polycarbonate film, a polyvinyl chloride film, a polyvinylidene chloride film, a polystyrene film, a polyamide film, or the like. The sheet made of the foam material may be, for example, an acrylic foam material sheet, a polyethylene foam material sheet, a chloroprene foam material sheet, a urethane foam material sheet, or the like. The sheet made of the foam material may be a sheet having adhesiveness. As such a sheet, acrylic foam tape (RT8016 manufactured by 3M Japan) or the like can be purchased. Nonwoven fabric was formed from polyester such as polyethylene terephthalate (PET), polyolefin such as high density polyethylene or polypropylene, polyamide such as nylon, polyvinyl alcohol, polyacrylonitrile, cellulose-based pulp natural fiber such as cotton or hemp, rayon, etc. It may be a non-woven fabric. The honeycomb structure has a plurality of cells (voids) partitioned by partition walls, and the cells open at both ends in the height direction (that is, the thickness direction of the honeycomb structure). The honeycomb structure is not limited to a hexagonal planar shape of cells, and may be, for example, a polygon such as a triangle, a quadrangle, a pentagon, and an octagon, a wave shape, a circle, or the like. The honeycomb structure may be made of a material containing an inorganic compound or a metal from the viewpoint of nonflammability. Materials containing inorganic compounds or metals include non-combustible paper or semi-incombustible paper mainly composed of inorganic components such as aluminum hydroxide, aluminum oxide, magnesium silicate, calcium silicate, aluminum hydroxide, oxidation Examples thereof include those obtained by sintering inorganic components such as aluminum, magnesium silicate, and calcium silicate, and those formed of aluminum, stainless steel, copper, and the like.

  In the case of a film, a sheet, and a nonwoven fabric, the thickness of the base material 5 may be 1 micrometer or more, 5 micrometers or more, or 10 micrometers or more, 1000 micrometers or less, 500 micrometers or less, or 100 micrometers or less, for example. In the case of a honeycomb structure, for example, it may be in a range of 5 mm or more, 20 mm or more, 500 mm or less, 100 mm or less, or 50 mm or less.

  The pressure-sensitive adhesive article 11 is used by bonding the main surface of the pressure-sensitive adhesive layer 2 opposite to the base material 5 to a concrete structure. The base material 5 may be bonded to the pressure-sensitive adhesive layer 2 in advance before construction, or after bonding one pressure-sensitive adhesive layer 2 to the concrete structure, the base material 5 is bonded to the other pressure-sensitive adhesive layer 2. May be pasted together. The thickness (shortest distance) T1 between the main surface of the pressure-sensitive adhesive layer 2 opposite to the base material 5 and the main surface of the fiber sheet 3 is 100 μm or less and 80 μm or less from the viewpoint of suitably reinforcing the concrete structure. Or 50 μm or less, 10 μm or more, 20 μm or more, or 30 μm or more.

  The thickness (shortest distance) T2 between the main surface of the adhesive layer 2 on the substrate 5 side and the main surface of the fiber sheet 3 may be 10 μm or more, or 20 μm or more, 300 μm or less, or 100 μm or less.

  From the viewpoint of preventing cracks in the concrete structure, a surface treatment agent such as an acrylic adhesive or an epoxy adhesive can be applied to the surface of the concrete structure before the adhesive article is applied to the concrete structure. The surface treatment agent may be an accelerating curable resin that accelerates curing when given heat, light, moisture, or the like. Moreover, the applied surface treatment layer may have a function as a primer layer with respect to an adhesive article.

The adhesive article 11 can be manufactured, for example, by the following method.
(1) A first pressure-sensitive adhesive layer is formed by, for example, applying a pressure-sensitive adhesive on the substrate 5, and the first pressure-sensitive adhesive layer is cured by, for example, irradiating ultraviolet light (even if heat-cured). Good).
(2) The fiber sheet 3 is disposed on the first pressure-sensitive adhesive layer.
(3) A second pressure-sensitive adhesive layer is formed on the fiber sheet 3 by, for example, applying a pressure-sensitive adhesive, and the second pressure-sensitive adhesive layer is cured by irradiating, for example, ultraviolet light (even if heat-cured. Good).
Thereby, the adhesive article 11 is obtained.
The pressure-sensitive adhesive article 1 (FIG. 1) that does not include the base material 5 is obtained, for example, by removing the base material 5 from the pressure-sensitive adhesive article 11 obtained above.

The adhesive articles 1 and 11 can be applied to the concrete structure 4 by the following method, for example.
(1) Optionally, a surface treatment agent is applied to the concrete structure 4 and dried, and if necessary, heat or light is applied to form a surface treatment layer.
(2) The adhesive layer 2 of the adhesive articles 1 and 11 is applied to the concrete structure 4 directly or via a surface treatment layer.
(3) Optionally, the base material 5 is further applied to the adhesive layer 2 on the opposite side of the concrete structure 4 of the adhesive article 1.

  The pressure-sensitive adhesive article may be other than the above embodiment. The pressure-sensitive adhesive article may include a liner on one or both main surfaces of the pressure-sensitive adhesive layer, for example. When the adhesive article includes a liner and a substrate, the liner may be provided on the substrate.

  The adhesive article of the present disclosure is suitable for preventing the peeling of concrete pieces from a concrete structure such as a bridge, a tunnel, and an elevated road, and the concrete structure can be obtained simply by applying the adhesive article directly to the concrete structure. It can be suitably reinforced.

  In the following examples, specific embodiments of the present disclosure are illustrated, but the present invention is not limited thereto. All parts and percentages are by weight unless otherwise specified.

<Example 1>
90 parts by mass of 2-ethylhexyl acrylate, 10 parts by mass of acrylic acid, and 0.04 parts by mass of a photopolymerization initiator (Irgacure 651, BASF Japan) were mixed. The obtained mixture was irradiated with 0.5 mW / cm ² of ultraviolet light, and the irradiation was terminated when the viscosity of the mixture reached 1000 cps. To the mixture after irradiation with ultraviolet light, 0.08 part by mass of 1,6-hexanediol diacrylate, 0.1 part by mass of a photopolymerization initiator (Irgacure 651), silica fine particles (A200, Nippon Aerosil Co., Ltd.) 1 After adding 0.5 mass part and 6 mass parts of glass hollow microparticles (K15, 3M company) and stirring, it cooled to 23 degreeC and obtained the adhesive.

  Next, the pressure-sensitive adhesive layer made of the obtained pressure-sensitive adhesive and the glass cloth (biaxial woven fabric, L160MA100LF, Unitika Ltd.) arranged in the pressure-sensitive adhesive layer are on a release liner (PET film: thickness 38 μm). The provided article was obtained.

Another peelable liner was placed on the pressure-sensitive adhesive layer side of the article. And the adhesive article was obtained by irradiating the article with ultraviolet light of 0.5 mW / cm ² (total energy: 1 J). The thickness of the pressure-sensitive adhesive layer of the obtained article was 1200 μm.

<Example 2>
It was produced in the same manner as in Example 1 except that the fiber sheet was changed to a vinylon woven fabric.

<Comparative Example 1>
A pressure-sensitive adhesive article was produced in the same manner as in Example 1 except that silica fine particles and glass hollow fine particles were not used.

<Comparative example 2>
It was produced in the same manner as in Example 1 except that the pressure-sensitive adhesive was changed to a butyl rubber-based pressure-sensitive adhesive.

<Reference Example 1>
An adhesive article was prepared in the same manner as in Example 1 except that no glass cloth was used.

<Reference Example 2>
An adhesive article was produced in the same manner as in Example 1 except that silica fine particles, glass hollow fine particles, and glass cloth were not used.

Each of the above-mentioned adhesive articles was subjected to the following concrete peeling prevention evaluation test.
<Concrete peeling prevention evaluation test>
Measured according to NEXCO test method 424-2011. First, as shown in FIGS. 4 and 5, a core part having a remaining part having an inner diameter of 100 mm, a groove width of 5 mm, and a depth of 60 mm by a concrete core cutter at the center of a concrete block 7 having a length of 400 mm, a width of 600 mm, and a height of 70 mm. Formed. The adhesive article 1 was applied to the surface of the concrete block 7 opposite to the core portion. The construction area was 400 mm long and 400 mm wide. Next, as shown in FIGS. 4 and 5, the concrete block 7 was installed at a position of a height h or higher where the peeling prevention property of the punching tester 6 can be confirmed. The core part of the concrete block 7 was loaded at a speed of 1 mm / min in the direction of the arrow through the spherical seat 8 until the remaining part of the core part was broken. After breaking, the load was applied at 5 mm / min to give a forced displacement to the adhesive article 1, and the load and displacement were continuously recorded with a load meter 9 and a displacement meter 10. Meanwhile, the loading was temporarily interrupted at each displacement of 10 mm, 20 mm, and 30 mm, and the peeling range of the adhesive article 1 was measured (marking). When the final load bearing capacity could be confirmed while the displacement was up to 30 mm, the test was terminated at that point. Furthermore, when it was judged that it had load bearing capacity, loading was continued to about 50 mm. The results are shown in Table 1. In addition, the thing with the largest maximum load and small maximum displacement amount shows that it is excellent in peeling prevention property.

DESCRIPTION OF SYMBOLS 1 Adhesive article 2 Adhesive layer 3 Fiber sheet 3a Fiber 4 Concrete structure 5 Base material 6 Punching test machine 7 Concrete block 8 Spherical seat 9 Load meter 10 Displacement meter

Claims (7)

It is a construction method of an adhesive article that prevents peeling of a concrete structure,
A pressure-sensitive adhesive article comprising a pressure-sensitive adhesive layer containing a pressure-sensitive acrylic polymer and inorganic fine particles, and a fiber sheet disposed in the pressure-sensitive adhesive layer, wherein the pressure-sensitive adhesive layer is present on both main surfaces of the article. A construction method comprising a step of directly applying an adhesive article to a concrete structure. It is a construction method of an adhesive article that prevents peeling of a concrete structure,
A step of applying a surface treatment agent to a concrete structure to form a surface treatment layer, and an adhesive comprising an adhesive layer containing an adhesive acrylic polymer and inorganic fine particles, and a fiber sheet disposed in the adhesive layer A construction method comprising a step of directly applying an adhesive article, which is an adhesive article, having an adhesive layer on both main surfaces of the article, to the surface treatment layer.   The construction method according to claim 1 or 2, wherein the fiber constituting the fiber sheet is selected from at least one of glass fiber, vinylon fiber, and aramid fiber.   The construction method according to any one of claims 1 to 3, wherein a protective layer or a sound absorbing material is applied to a main surface opposite to the concrete structure application side of the adhesive article.   A pressure-sensitive adhesive article comprising a pressure-sensitive adhesive layer containing a pressure-sensitive acrylic polymer and inorganic fine particles, and a fiber sheet disposed in the pressure-sensitive adhesive layer, wherein the pressure-sensitive adhesive layer is present on both main surfaces of the article. The adhesive article used with the construction method of Claim 1 or 2.   The adhesive article according to claim 5, wherein the fiber constituting the fiber sheet is selected from at least one of glass fiber, vinylon fiber, and aramid fiber.   The adhesive article of Claim 5 or 6 whose tensile strength of the said fiber sheet is 500 N / 25mm or more.

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