Concrete structure, method for producing concrete structure, detection method, resin composition, resin composition set, concrete construction method, and structure

Abstract

To provide a concrete structure capable of confirming the failure of a layer positioned in the outermost layer in a functional layer for protecting, reinforcing or repairing concrete.SOLUTION: A concrete structure 100 including a functional layer 30 for protecting, reinforcing, or repairing concrete on concrete 50, wherein the functional layer 30 is transparent in a visible light region, the functional layer 30 includes a top layer 10 and a detection layer 20, the top layer 10 is a layer located in an outermost layer of the concrete structure 100 and composed of a resin composition (A) containing an ultraviolet absorber, and the detection layer 20 is a layer that is colored when irradiated with light in an ultraviolet region.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a concrete structure, a method for manufacturing a concrete structure, a detection method, a resin composition, a resin composition set, a concrete construction method, and a structure. [Background technology]

[0002] A concrete structure having a functional layer on the concrete to protect, reinforce or repair the concrete has been considered. As a technique relating to such a concrete structure, for example, the technique described in Patent Document 1 can be mentioned.

[0003] Patent Document 1 describes the structure of a reinforcing layer formed on the surface of concrete to prevent cracks in the surface layer of the concrete, their progression, and the peeling off of concrete pieces, characterized in that a net-like or mesh-like reinforcing material is fixed to the surface of the concrete to be reinforced with a transparent resin layer, and a marking layer is formed on the concrete surface around existing cracks by applying and coloring a marking material in a position surrounding the crack. According to the structure of the concrete reinforcement layer in Patent Document 1, the area around the crack is colored with a marking material such as fluorescent paint to form a marking layer, so that the location of the crack can be clearly confirmed even in dark places such as inside a tunnel, and it is described as being possible to improve the work efficiency for visual observation. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-46264 Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention provides a concrete structure that makes it possible to check for defects in the outermost layer of a functional layer that protects, reinforces, or repairs concrete. [Means for solving the problem]

[0006] According to the present invention, there are provided the following concrete structure, method for manufacturing a concrete structure, detection method, resin composition, resin composition set, concrete construction method, and structure.

[0007] [1] A concrete structure provided with a functional layer on concrete to protect, reinforce or repair the concrete, The functional layer is transparent in the visible light region, the functional layer comprises a top layer and a detection layer; the top layer is located as the outermost layer of the concrete structure and is a layer made of a resin composition (A) containing an ultraviolet absorber, A concrete structure, wherein the detection layer is a layer that becomes colored when irradiated with light in the ultraviolet region. [2] The concrete structure according to [1] above, wherein the resin composition (A) contains at least one resin selected from the group consisting of a fluororesin, a silicone resin, a urethane resin, and a polyester resin. [3] The concrete structure according to [1] or [2], wherein the resin composition (A) does not contain a colorant, or the content of the colorant in the resin composition (A) is less than 1% by mass when the total of all components in the resin composition (A) is 100% by mass. [4] The concrete structure according to any one of the above [1] to [3], wherein the detection layer is a layer containing a resin composition (B) that contains a colorant. [5] The content of the colorant in the resin composition (B) is 0.001% by mass or more and 1% by mass or less, when the total of all components in the resin composition (B) is 100% by mass. The concrete structure according to [4]. [6] The concrete structure according to [4] or [5], wherein the colorant contains a phosphor. [7] The concrete structure according to any one of [4] to [6], wherein the resin composition (B) contains at least one resin selected from the group consisting of polyester resin, (meth)acrylic resin, modified silicone resin, urethane resin, urea resin, urethane urea resin, and epoxy resin. [8] The concrete structure according to any one of [4] to [7] above, wherein the resin composition (B) has a tensile modulus of elasticity of 50 MPa or more and 5000 MPa or less. [9] The concrete structure according to any one of the above [4] to [8], wherein the resin composition (B) is an adhesive resin composition.

[10] The concrete structure according to any one of [1] to [9] above, which can be used under sunlight.

[11] The method for manufacturing a concrete structure according to any one of [1] to

[10] , forming the detection layer on the surface side of the concrete; and forming the top layer on the side of the detection layer opposite the concrete side.

[12] A detection method for detecting defects in the top layer of the concrete structure according to any one of [1] to

[11] , A detection method comprising the step of irradiating the concrete structure with light in the ultraviolet region from the top layer side.

[13] A resin composition capable of detecting defects in the outermost layer of a concrete structure having a functional layer on concrete that protects, reinforces, or repairs the concrete, comprising: The resin composition is transparent in the visible light region and becomes colored when irradiated with light in the ultraviolet region.

[14] A resin composition set capable of protecting, reinforcing or repairing concrete, comprising: The resin composition (A) includes a resin composition (B), the resin composition (A) contains an ultraviolet absorber and is transparent in the visible light region; The resin composition set, wherein the resin composition (B) is transparent in the visible light region and becomes colored when irradiated with light in the ultraviolet region.

[15] A concrete construction method selected from the group consisting of a spalling prevention construction method, a reinforcement construction method, and a surface protection construction method, forming a detection layer on the surface side of the concrete; and forming a top layer on the detection layer opposite the concrete side, the top layer is located as an outermost layer, is transparent in the visible light region, and is made of a resin composition (A) containing an ultraviolet absorber; A concrete construction method, wherein the detection layer is a layer that is transparent in the visible light region and that becomes colored when irradiated with light in the ultraviolet region.

[16] A structure having a functional layer on an object, The functional layer is transparent in the visible light region, the functional layer comprises a top layer and a detection layer; the top layer is located as the outermost layer of the structure and is a layer made of a composition (A) containing an ultraviolet absorber, The detection layer is a layer that becomes colored when irradiated with light in the ultraviolet region. [Effects of the Invention]

[0008] According to the present invention, a concrete structure can be provided that makes it possible to check for defects in the outermost layer of a functional layer that protects, reinforces, or repairs concrete. [Brief explanation of the drawings]

[0009] [Figure 1]1 is a cross-sectional view schematically showing an example of a concrete structure according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments of the present invention will be described with reference to the drawings. The drawings are simplified and do not correspond to actual dimensional ratios. The numerical range "A to B" represents A or more and B or less unless otherwise specified. In this specification, "(meth)acrylic" means "at least one of acrylic and methacrylic." Furthermore, in this specification, the term "resin" is used to include a monomer (polymerizable compound) that becomes a resin through polymerization. The composition is preferably a resin composition.

[0011] There are structures having a functional layer on an object, for example, a structure having a functional layer for protecting, reinforcing, or repairing the object. The object is preferably concrete. As such a structure, a concrete structure having a functional layer on the concrete for protecting, reinforcing, or repairing the concrete is known. Such a functional layer may be required to be transparent so that cracks and the like occurring on the surface of the concrete can be observed. On the other hand, if the functional layer is transparent, it may be difficult to confirm defects in the functional layer (poor construction, deterioration, etc.). The present invention provides a concrete structure that makes it possible to check for defects in the outermost layer of a functional layer that protects, reinforces, or repairs concrete, even if the functional layer is transparent.

[0012] [Concrete structure] FIG. 1 is a cross-sectional view schematically showing an example of a concrete structure according to the present embodiment. The concrete structure 100 is a concrete structure having a functional layer 30 on concrete 50 that protects, reinforces, or repairs the concrete, the functional layer 30 being transparent in the visible light range, the functional layer 30 comprising a top layer 10 and a detection layer 20, the top layer 10 being located on the outermost layer of the concrete structure 100 and being a layer made of a resin composition (A) containing an ultraviolet absorber, and the detection layer 20 being a layer that becomes colored when irradiated with light in the ultraviolet range.

[0013] The top layer 10 of the concrete structure 100 contains an ultraviolet absorber. Therefore, if there is no defect in the top layer 10 (poor construction, deterioration, etc.), when ultraviolet light is irradiated from the top layer side of the concrete structure 100, the ultraviolet absorber contained in the top layer 10 absorbs the ultraviolet light, so the ultraviolet light does not reach the detection layer 20 and the detection layer 20 does not become colored. On the other hand, if there is a defect in the top layer 10, when ultraviolet light is irradiated from the top layer side of the concrete structure 100, the ultraviolet absorber contained in the top layer 10 cannot sufficiently absorb the ultraviolet light, so the ultraviolet light reaches the detection layer 20 and the detection layer 20 becomes colored. That is, according to the concrete structure of this embodiment, it is possible to check for defects in the layer (top layer 10) located at the outermost layer of the functional layers that protect, reinforce or repair the concrete.

[0014] In this specification, light in the visible light region means, for example, light with a wavelength of more than 400 nm and not more than 780 nm, and light in the ultraviolet region means, for example, light with a wavelength of 10 nm or more and 400 nm or less, preferably light with a wavelength of 300 nm or more and 400 nm or less.

[0015] The concrete structure 100 may be a concrete structure that can be used under sunlight, or a concrete structure that can be used in a place where sunlight does not reach, but is preferably a concrete structure that can be used under sunlight. Here, concrete structures that can be used under sunlight include, for example, concrete structures that form bridges, etc. Concrete structures that can be used in places where sunlight does not reach include, for example, concrete structures that form tunnels, etc.

[0016] Each layer of the concrete structure 100 will now be described.

[0017] <Concrete> The concrete structure 100 comprises concrete 50 . The concrete 50 is not particularly limited, but may be, for example, a portion of concrete in a structure. Examples of structures include bridges and tunnels. The concrete 50 may be part of the concrete of an existing structure or part of the concrete of a new structure.

[0018] <Functional layer> The concrete structure 100 includes a functional layer 30 on the concrete 50 that protects, reinforces, or repairs the concrete. The functional layer that protects, reinforces or repairs concrete is, for example, any one selected from the group consisting of functional layers in anti-slip methods, functional layers in reinforcement methods, and functional layers in surface protection methods, and preferably any one selected from the group consisting of functional layers in reinforcement methods and functional layers in surface protection methods.

[0019] The functional layer 30 is transparent in the visible light region. Here, when the functional layer 30 is transparent in the visible light range, it means that it has a degree of transparency in the visible light range that allows the surface of the concrete 50 to be observed when the concrete structure 100 is observed from the functional layer 30 side.

[0020] The functional layer 30 includes a top layer 10 and a detection layer 20. The functional layer 30 may include layers other than the top layer 10 and the detection layer 20 as appropriate.

[0021] Of the layers constituting the functional layer 30, one layer may be the detection layer 20, or two or more layers may be the detection layer 20.

[0022] From the viewpoint of making it easier to check for defects in the top layer 10, the detection layer 20 is preferably a layer that is in direct contact with the top layer 10, or a layer that is located one to three layers away from the top layer 10, and more preferably a layer that is in direct contact with the top layer 10.

[0023] Three preferred embodiments of the layer structure of the functional layer 30 will be described below.

[0024] A first preferred embodiment of the layer structure of the functional layer 30 will be described. The functional layer 30 preferably includes, in order from the concrete 50 side, a primer layer, a first adhesive resin layer, a fiber substrate layer, a second adhesive resin layer, and a top layer 10. In the functional layer 30, at least one layer selected from the group consisting of the primer layer, the first adhesive resin layer, the fiber substrate layer, and the second adhesive resin layer is the detection layer 20. A first preferred embodiment of the layer configuration of the functional layer 30 is suitable when the functional layer 30 is a functional layer that reinforces or repairs concrete.

[0025] A second preferred embodiment of the layer structure of the functional layer 30 will be described. The functional layer 30 preferably includes, in order from the concrete 50 side, a primer layer, a first adhesive resin layer, a first fiber substrate layer, a second adhesive resin layer, a second fiber substrate layer, a third adhesive resin layer, and a top layer 10. In the functional layer 30, at least one layer selected from the group consisting of the primer layer, the first adhesive resin layer, the first fiber substrate layer, the second adhesive resin layer, the second fiber substrate layer, and the third adhesive resin layer is the detection layer 20. A second preferred embodiment of the layer configuration of the functional layer 30 is suitable when the functional layer 30 is a functional layer that reinforces or repairs concrete.

[0026] A third preferred embodiment of the layer structure of the functional layer 30 will be described. The functional layer 30 preferably includes, in order from the concrete 50 side, a primer layer, an intermediate coating layer, and a top layer 10. In the functional layer 30, at least one layer selected from the group consisting of the primer layer and the intermediate coating layer is the detection layer 20. A third preferred embodiment of the layer configuration of the functional layer 30 is suitable when the functional layer 30 is a functional layer that protects concrete.

[0027] <Top tier> The functional layer 30 comprises a top layer 10 . The top layer 10 is located as the outermost layer of the concrete structure 100 and is a layer made of a resin composition (A) containing an ultraviolet absorber.

[0028] Preferred aspects of the components contained in the resin composition (A) constituting the top layer 10 are the same as the preferred aspects of the components contained in the resin composition (A) in the resin composition set described below.

[0029] The thickness of the top layer 10 is preferably 0.1 mm or more and 5 mm or less, more preferably 0.3 mm or more and 3 mm or less, and even more preferably 0.5 mm or more and 2 mm or less.

[0030] <Detection layer> The functional layer 30 comprises the detection layer 20 . The detection layer 20 is a layer that changes color when irradiated with light in the ultraviolet range.

[0031] The detection layer 20 may be a layer made of a resin composition or a layer containing a fiber substrate. The layer containing a fiber substrate may be a layer made of a fiber substrate or a layer in which a fiber substrate is impregnated with a resin composition.

[0032] The detection layer 20 is preferably a layer containing a resin composition (B) that contains a colorant. The layer containing the resin composition (B) may be a layer made of the resin composition (B), or may be a layer in which a fibrous base material is impregnated with the resin composition (B).

[0033] Preferred aspects of the components contained in the resin composition (B) constituting the detection layer 20 are the same as the preferred aspects of the components contained in the resin composition (B) in the resin composition set described below.

[0034] The fibers constituting the fiber substrate contained in the detection layer 20 include at least one selected from the group consisting of, for example, glass fiber, (meth)acrylic fiber, polyethylene fiber, nylon 6 fiber, nylon 6,6 fiber, polyester fiber, polypropylene fiber, vinylon fiber, aramid fiber, carbon fiber, and PBO (polyparaphenylenebenzoxazole) fiber, and preferably include glass fiber. The fiber substrate may be a woven fabric, a nonwoven fabric, or a mesh.

[0035] When the detection layer 20 is a layer made of a fiber substrate, the colorant is preferably contained in the fibers. When the detection layer 20 is a layer made of a fiber substrate impregnated with a resin composition, the colorant is preferably contained in at least one of the fibers and the resin composition. The colorant has the same meaning as the colorant contained in the resin composition (B).

[0036] When the detection layer 20 is a layer made of a resin composition, its thickness is preferably 0.1 mm or more and 10 mm or less, more preferably 0.3 mm or more and 5 mm or less, and even more preferably 0.5 mm or more and 3 mm or less.

[0037] When the detection layer 20 is a layer containing a fibrous substrate, its thickness is preferably 0.1 mm or more and 10 mm or less, more preferably 0.3 mm or more and 5 mm or less, and even more preferably 0.5 mm or more and 3 mm or less.

[0038] <Adhesive resin layer> The adhesive resin layer in the preferred layer structure of the functional layer 30 will be described. The adhesive resin layer of this embodiment is a layer made of an adhesive resin composition.

[0039] When the adhesive resin layer of this embodiment functions as the detection layer 20, the adhesive resin composition is preferably the resin composition (B).

[0040] When the adhesive resin layer of this embodiment does not function as the detection layer 20, the adhesive resin composition can be, for example, a resin composition similar to the resin composition (B) except that it does not contain a colorant.

[0041] The thickness of the adhesive resin layer is preferably 0.1 mm or more and 10 mm or less, more preferably 0.3 mm or more and 5 mm or less, and even more preferably 0.5 mm or more and 3 mm or less.

[0042] When the functional layer 30 contains two or more adhesive resin layers, the adhesive resin layers may be of the same type or different types.

[0043] <Fiber base material layer> The fiber substrate layer in the preferred layer configuration of the functional layer 30 will be described. The fibrous substrate layer is a layer containing a fibrous substrate. The fibrous substrate layer may be a layer made of a fibrous substrate, or may be a layer in which a fibrous substrate is impregnated with a resin composition.

[0044] When the fiber substrate layer of this embodiment functions as the detection layer 20, preferred aspects of the fiber substrate are the same as those of the fiber substrate in the detection layer 20 described above.

[0045] When the fiber substrate layer of this embodiment does not function as the detection layer 20, the fiber substrate can have the same configuration as the fiber substrate in the detection layer 20, except that it does not contain a colorant, for example.

[0046] The tensile modulus of the fibrous substrate layer is preferably 10 GPa or more and 500 GPa or less, more preferably 30 GPa or more and 350 GPa or less, and even more preferably 50 GPa or more and 250 GPa or less. The tensile modulus of elasticity of the fibrous substrate layer means a value measured, for example, in accordance with JIS A 1191:2004 under conditions of a measurement temperature of 23°C and a pulling rate of 2 mm / min.

[0047] The thickness of the fibrous base material layer is preferably 0.1 mm or more and 10 mm or less, more preferably 0.3 mm or more and 5 mm or less, and even more preferably 0.5 mm or more and 3 mm or less.

[0048] When the functional layer 30 includes two or more fiber substrate layers, the same type of fiber substrate layers may be used, or different types of fiber substrate layers may be used.

[0049] <Primer layer> The primer layer in the preferred layer configuration of the functional layer 30 will be described. The primer layer is the layer that directly contacts the concrete 50 .

[0050] The primer layer is, for example, a layer made of a primer composition. The primer composition includes, for example, a resin. Examples of the resin contained in the primer composition include at least one selected from the group consisting of (meth)acrylic resin, olefin resin, vinyl acetate resin, urethane resin, epoxy resin, aminated epoxy resin, urea resin, silicone resin, modified silicone resin, and modified resins thereof.

[0051] When a primer layer functions as the detection layer 20, the primer composition preferably includes a colorant. The type and content of the colorant contained in the primer layer may be the same as those of the resin composition (B) in the resin composition set described below.

[0052] The total amount of nonvolatile components of the primer composition in the primer layer is preferably 0.01 kg / m 2 More than 0.6kg / m 2 Less than or equal to 0.03 kg / m, more preferably 0.03 kg / m 2 More than 0.3kg / m 2 or less, more preferably 0.05 kg / m 2 More than 0.2kg / m 2 The following is the result.

[0053] <Intermediate layer> The intermediate layer in the preferred layer structure of the functional layer 30 will be described.

[0054] The intermediate coating layer is, for example, a layer made of an intermediate coating layer composition. The intermediate layer composition contains, for example, a resin. The resin contained in the intermediate layer composition includes, for example, at least one selected from the group consisting of modified silicone resin, urethane resin, urea resin, urethane urea resin, epoxy resin, and (meth)acrylic resin.

[0055] When an intermediate layer functions as the detection layer 20, the intermediate layer composition preferably includes a colorant. The type and content of the colorant contained in the intermediate coating layer may be the same as those of the resin composition (B) in the resin composition set described below.

[0056] The thickness of the intermediate coating layer is preferably 0.1 mm or more and 3 mm or less, more preferably 0.3 mm or more and 2.5 mm or less, even more preferably 0.5 mm or more and 2 mm or less, and even more preferably 0.7 mm or more and 1.8 mm or less. The total amount of non-volatile components of the intermediate coating layer composition in the intermediate coating layer is preferably 0.5 kg / m 2 More than 2kg / m 2 Less than or equal to 0.7 kg / m 2 More than 1.7kg / m 2 The following is the result.

[0057] [Method of manufacturing concrete structures] The method for manufacturing the concrete structure 100 includes a step of forming a detection layer 20 on the surface side of the concrete 50, and a step of forming a top layer 10 on the side of the detection layer 20 opposite the concrete 50 side.

[0058] The method for forming the detection layer 20 on the surface side of the concrete 50 is not particularly limited, but examples include a method in which a resin composition is applied to the surface side of the concrete 50, dried, and then a detection layer 20 made of the resin composition is formed, and a method in which a fiber substrate is placed on the surface side of the concrete 50, and then a detection layer 20 containing the fiber substrate is formed.

[0059] When forming a detection layer 20 containing a fiber substrate, it is preferable to form an adhesive resin layer on the surface side of the concrete 50, and then attach the fiber substrate to the adhesive resin layer to form the detection layer 20 containing the fiber substrate.

[0060] The method for forming the top layer 10 on the side opposite the concrete 50 side of the detection layer 20 is not particularly limited, but examples include a method of applying and drying a resin composition (A) to form a top layer made of the resin composition (A).

[0061] The method for manufacturing the concrete structure 100 may further include a step of forming layers other than the detection layer 20 and the top layer 10 .

[0062] [Detection method] The detection method of this embodiment is a method for detecting defects in the top layer 10 of a concrete structure 100, and includes a step of irradiating the concrete structure 100 with light in the ultraviolet region from the top layer 10 side.

[0063] When light in the ultraviolet region is irradiated from the top layer 10 side of the concrete structure 100, the detection layer 20 becomes colored if there is a defect in the top layer 10, so that defects in the top layer 10 can be detected.

[0064] The method of irradiating the top layer 10 with light in the ultraviolet range is not particularly limited, and for example, light in the ultraviolet range may be irradiated using an ultraviolet light. The wavelength of the light in the ultraviolet region may be selected so as to include, for example, the excitation wavelength of the phosphor contained in the detection layer 20. Specifically, the wavelength of the light in the ultraviolet region is, for example, not less than 300 nm and not more than 400 nm.

[0065] [Resin composition] The resin composition of this embodiment is a resin composition that can detect defects in the outermost layer of a concrete structure that has a functional layer on top of the concrete that protects, reinforces, or repairs the concrete, and the resin composition is transparent in the visible light range and becomes colored when irradiated with light in the ultraviolet range. Here, the outermost layer of the concrete structure is a layer that does not contain the resin composition of this embodiment.

[0066] The resin composition of the present embodiment can be preferably used for the detection layer 20 in the concrete structure 100.

[0067] The resin composition of this embodiment is similar to the resin composition (B) in the resin composition set described below.

[0068] [Resin composition set] The resin composition set of this embodiment is a resin composition set capable of protecting, reinforcing, or repairing concrete, and includes a resin composition (A) and a resin composition (B). The resin composition (A) includes an ultraviolet absorber and is transparent in the visible light region, and the resin composition (B) is transparent in the visible light region and becomes colored when irradiated with light in the ultraviolet region.

[0069] Hereinafter, the resin composition (A) and the resin composition (B) in the resin composition set of this embodiment will be described.

[0070] <Resin composition (A)> The resin composition (A) contains an ultraviolet absorber and is transparent in the visible light region.

[0071] Here, the resin composition (A) being transparent in the visible light region means that a resin film made of the resin composition (A) having a thickness of 1 mm is transparent in the visible light region. Also, the resin film being transparent in the visible light region means that when a structure in which a resin film having a thickness of 1 mm is formed on concrete is observed from the resin film side in the visible light region, the resin film has transparency to such an extent that the surface of the concrete can be observed.

[0072] The resin composition (A) contains a resin. The resin composition (A) preferably contains at least one resin selected from the group consisting of a fluororesin, a silicone resin, a urethane resin, and a polyester resin.

[0073] The resin composition (A) contains an ultraviolet absorber. The ultraviolet absorber includes, for example, at least one selected from the group consisting of benzotriazole-based ultraviolet absorbers and hydroxyphenyltriazine-based ultraviolet absorbers.

[0074] The content of the ultraviolet absorber in the resin composition (A) is preferably 0.1% by mass or more and 10% by mass or less, and more preferably 15% by mass or less, from the viewpoint of further improving the durability of the layer containing the resin composition (A), when the total of all components in the resin composition (A) is taken as 100% by mass.

[0075] The content of the colorant in the resin composition (A), when the total of all components in the resin composition (A) is taken as 100% by mass, is preferably less than 1% by mass, more preferably less than 0.1% by mass, even more preferably less than 0.05% by mass, even more preferably less than 0.01% by mass, from the viewpoint of making it easier to check defects in the top layer 10, and even more preferably, the resin composition (A) does not contain any colorant. Here, the colorant contained in the resin composition (A) has the same meaning as the colorant contained in the resin composition (B).

[0076] The resin composition (A) may contain components such as an antioxidant as appropriate.

[0077] The resin composition (A) can be preferably used in the top layer 10 of the concrete structure 100 .

[0078] <Resin composition (B)> The resin composition (B) is transparent in the visible light region and becomes colored when irradiated with light in the ultraviolet region.

[0079] Here, the resin composition (B) being transparent in the visible light region has the same meaning as the resin composition (A) being transparent in the visible light region. Furthermore, when the resin composition (B) is irradiated with light in the ultraviolet region, the resin composition (B) is colored. This means that when a resin film made of the resin composition (B) is irradiated with light in the ultraviolet region, the resin film is colored.

[0080] Resin composition (B) becomes colored when irradiated with light in the ultraviolet region. Therefore, when a coating layer made of resin composition (B) is irradiated with light in the ultraviolet region, areas where resin composition (B) has been applied become colored, while areas where resin composition (B) has not been applied remain colored, making it possible to confirm coating unevenness in the coating layer made of resin composition (B).

[0081] The resin composition (B) contains a resin. The resin composition (B) preferably contains at least one selected from the group consisting of polyester resins, (meth)acrylic resins, modified silicone resins, urethane resins, urea resins, urethane urea resins, and epoxy resins. The resin composition (B) preferably contains a resin composition obtained by polymerizing a compound having a radically polymerizable double bond. The resin composition obtained by polymerizing a compound having a radically polymerizable double bond preferably contains at least one selected from the group consisting of polyester resins and (meth)acrylic resins, and more preferably contains a (meth)acrylic resin. The (meth)acrylic resin preferably contains at least one selected from the group consisting of bisphenol A-type alkylene oxide-modified di(meth)acrylate, bisphenol A-type diglycidyl ether (meth)acrylic acid adduct, urethane (meth)acrylate, dicyclopentenyloxyethyl (meth)acrylate, and 2-hydroxyalkyl (meth)acrylate. The polyester resin preferably comprises an unsaturated polyester resin.

[0082] The resin composition (B) preferably contains a colorant. The colorant has the property of becoming colored when irradiated with light in the ultraviolet region.

[0083] When the resin composition (B) contains a colorant, it is possible to evaluate the uniformity of a paint containing the resin composition (B). The uniformity of the paint can be evaluated by irradiating the paint with light in the ultraviolet region and checking whether the coloring of the paint is uniform.

[0084] The colorant includes, for example, at least one selected from the group consisting of a fluorescent material and a phosphorescent material, and preferably includes a fluorescent material. The excitation wavelength of the phosphor is, for example, 10 nm or more and 400 nm or less, preferably 300 nm or more and 400 nm or less.

[0085] The phosphor preferably has the property of being colorless and transparent when dispersed in a resin in the visible light region, and emitting light when irradiated with light in the ultraviolet region. Examples of commercially available phosphors having the above properties include Lumisys G-3300, Lumisys E-400, and Lumisys B-800 (manufactured by Central Techno Co., Ltd.).

[0086] The content of the colorant in the resin composition (B) is preferably 0.001% by mass or more and 1% by mass or less, more preferably 0.005% by mass or more and 0.5% by mass or less, and even more preferably 0.01% by mass or more and 0.3% by mass or less, from the viewpoint of making it easier to check defects in the top layer 10, when the total of all components in the resin composition (B) is 100% by mass.

[0087] When the total of all components in the resin composition (B) is taken as 100% by mass, the content of the plasticizer in the resin composition (B) is preferably less than 10% by mass, more preferably less than 5% by mass, even more preferably less than 1% by mass, even more preferably less than 0.1% by mass, from the viewpoint of adjusting the tensile modulus of the resin composition (B) within an appropriate range, and even more preferably the resin composition (B) does not contain a plasticizer. The plasticizer includes, for example, at least one selected from the group consisting of phthalate esters, phosphate ester glycols, and epoxy-based plasticizers.

[0088] The resin composition (B) may contain components such as a redox initiator, paraffin, and antioxidant as appropriate.

[0089] From the viewpoint of polymerizability, the redox initiator preferably contains an oxidizing agent and a reducing agent. The oxidizing agent preferably includes an organic peroxide. The content of the oxidizing agent in the resin composition (B) is preferably 0.1 parts by mass or more and 10 parts by mass or less relative to 100 parts by mass of the compound having a radically polymerizable double bond in the resin composition (B). The reducing agent preferably includes a transition metal salt including at least one selected from the group consisting of an iron complex and cobalt 2-ethylhexanoate. The content of the reducing agent in the resin composition (B) is preferably 0.1 parts by mass or more and 10 parts by mass or less relative to 100 parts by mass of the compound having a radically polymerizable double bond in the resin composition (B).

[0090] The paraffin preferably contains solid paraffin from the viewpoint of quickly hardening the portion in contact with air. The content of paraffin in the resin composition (B) is preferably 0.01% by mass or more and 2% by mass or less, when the total of all components in the resin composition (B) is taken as 100% by mass.

[0091] From the viewpoint of improving storage stability, the antioxidant preferably contains at least one selected from the group consisting of hydroquinone and 2-2,2-methylenebis(4-methyl-6-tert-butylphenol). The content of the antioxidant in the resin composition (B) is preferably 0.001 parts by mass or more and 3 parts by mass or less relative to 100 parts by mass of the compound having a radically polymerizable double bond in the resin composition (B).

[0092] The tensile modulus of the resin composition (B) is preferably 50 MPa or more and 5000 MPa or less, more preferably 200 MPa or more and 4500 MPa or less, even more preferably 500 MPa or more and 4000 MPa or less, even more preferably 1000 MPa or more and 3500 MPa or less, and even more preferably 1500 MPa or more and 3000 MPa or less. The tensile modulus of the resin composition (B) refers to a value measured in accordance with JIS K 6251:2017 under conditions of a measurement temperature of 23°C and a tensile speed of 2 mm / min.

[0093] The tensile strength of the resin composition (B) is preferably 1 MPa or more and 100 MPa or less, more preferably 10 MPa or more and 50 MPa or less. The tensile strength of the resin composition (B) means a value measured in accordance with JIS K 6251:2017 under conditions of a measurement temperature of 23°C and a tensile speed of 2 mm / min.

[0094] The elongation at break of the resin composition (B) is not particularly limited, and may be, for example, 1% or more and 200% or less, 1% or more and 100% or less, 1% or more and 50% or less, 1% or more and 15% or less, or 3% or more and 10% or less. The breaking elongation of the resin composition (B) means a value measured in accordance with JIS K 6251:2017 under conditions of a measurement temperature of 23°C and a tensile speed of 2 mm / min.

[0095] The resin composition (B) is preferably an adhesive resin composition.

[0096] The resin composition (B) can be preferably used in the detection layer 20 in the concrete structure 100.

[0097] The resin composition (A) and the resin composition (B) can be obtained, for example, by mixing the respective components.

[0098] [Concrete construction method] The concrete construction method of this embodiment is any concrete construction method selected from the group consisting of spalling prevention methods, reinforcement methods, and surface protection methods, and includes the steps of forming a detection layer 20 on the surface side of concrete 50, and forming a top layer 10 on the side of the detection layer 20 opposite the concrete 50 side, where the top layer 10 is located as the outermost layer, is transparent in the visible light region, and is made of a resin composition (A) containing an ultraviolet absorber, and the detection layer 20 is transparent in the visible light region and is a layer that becomes colored when irradiated with light in the ultraviolet region.

[0099] The concrete construction method of this embodiment is any concrete construction method selected from the group consisting of spalling prevention methods, reinforcement methods, and surface protection methods, and is preferably any concrete construction method selected from the group consisting of reinforcement methods and surface protection methods.

[0100] In the concrete construction method of this embodiment, the aspects of the "step of forming a detection layer 20 on the surface side of the concrete 50" and the "step of forming a top layer 10 on the side opposite the concrete 50 side of the detection layer 20" are the same as the aspects of each step in the concrete structure manufacturing method of this embodiment.

[0101] The concrete construction method of the present embodiment may further include a step of forming layers other than the detection layer 20 and the top layer 10.

[0102] The top layer 10 being transparent in the visible light region means that when a structure in which the top layer 10 is formed on concrete is observed from the side of the top layer 10 in the visible light region, the top layer 10 has a transparency to such an extent that the surface of the concrete can be observed. The same applies to the detection layer 20 being transparent in the visible light region.

[0103] Other aspects of the concrete 50, the top layer 10, and the detection layer 20 in the concrete construction method of this embodiment are the same as the aspects of each layer described in the concrete structure of this embodiment.

[0104] Although the embodiments of the present invention have been described above, these are merely examples of the present invention, and various other configurations can also be adopted. Furthermore, the present invention is not limited to the above-described embodiment, and modifications and improvements within the scope of achieving the object of the present invention are included in the present invention. [Example]

[0105] The present embodiment will be described in detail below based on examples and comparative examples, but the present embodiment is not limited to the descriptions of these examples.

[0106] [Raw materials] First, the raw materials used in the examples and listed in Table 1 will be described.

[0107] <Compounds having radically polymerizable double bonds> Compound 1 (bisphenol A-type ethylene oxide-modified dimethacrylate, manufactured by Miwon, product name: Miramer M210) Compound 2 (bisphenol A diglycidyl ether acrylic acid adduct, manufactured by Osaka Organic Chemical Industry, Ltd., product name: Viscoat #540) Compound 3 (urethane acrylate, manufactured by Miwon, product name: Miramer M3603) Compound 4 (unsaturated polyester, manufactured by DIC Materials, product name: Aqualite CN-450-R) Compound 5 (dicyclopentenyloxyethyl methacrylate, manufactured by Resonac Corporation, product name: FA-512M) Compound 6 (2-hydroxyethyl methacrylate, manufactured by GEO Specialty Chemicals, product name: BISOMER HEMA)

[0108] <Redox initiator> Initiator 1 (oxidizing agent, cumene hydroxyperoxide, manufactured by Nouryon Chemical Co., Ltd., product name: Trigonox K-80) Initiator 2 (reducing agent, iron complex solution, manufactured by Borchers, product name: Borchi OXY Coat) Initiator 3 (reducing agent, cobalt 2-ethylhexanoate, manufactured by Tokyo Fine Chemical Co., Ltd., product name: Co-12E)

[0109] <Other ingredients> Ingredient 1 (antioxidant, hydroquinone, manufactured by Seiko Chemical Co., Ltd.) Ingredient 2 (antioxidant, 2,2-methylenebis(4-methyl-6-tert-butylphenol), manufactured by Sumitomo Chemical Co., Ltd., product name: Sumilizer MDP-S) Ingredient 3 (Paraffin, solid paraffin, manufactured by Nippon Seiro Co., Ltd., product name: ParaffinWax-115)

[0110] <Phosphor> Green phosphor (manufactured by Central Techno Co., Ltd., product name: Lumesis G-3300, 2-(3-oxoisoindolin-1-ylidene)methylquinoline, excitation wavelength 375 nm) Red phosphor (manufactured by Central Techno Co., Ltd., product name: Lumisys E-400) Blue phosphor (manufactured by Central Techno Co., Ltd., product name: Lumisys B-800, 4,4'-bis(2-benzoxazolyl)stilbene, excitation wavelength 361 nm)

[0111] [Examples 1 to 5 and Comparative Example 1] <Preparation of Resin Composition for Detection Layer> Based on the formulation (parts by mass) shown in Table 1, a compound having a radically polymerizable double bond and other components were mixed and stirred at 60°C for 1 hour to obtain a mixed solution, which was then cooled to 23°C, a redox initiator was added to the mixed solution, and the mixture was stirred at 23°C for 1 hour, and a phosphor was then added to the mixed solution, and the mixture was stirred at 23°C for 1 hour to prepare the first agents of Examples 1 to 5 and Comparative Example 1, respectively. Based on the formulation (parts by mass) shown in Table 1, a compound having a radically polymerizable double bond and other components were mixed and stirred at 60°C for 1 hour to obtain a mixed solution, which was then cooled to 23°C, a redox initiator was added to the mixed solution, and the mixture was stirred at 23°C for 1 hour to prepare the second agents of Examples 1 to 5 and Comparative Example 1, respectively. The first and second parts were mixed at room temperature so that the mass ratio of the first part to the second part was 1:1 to prepare resin compositions for the detection layers of Examples 1 to 5 and Comparative Example 1.

[0112] <Preparation of film with detection layer> The resin composition for the detection layer was applied to a polyethylene terephthalate film (PET film) to a film thickness of 1 mm, and a PET film was attached to the side opposite the PET film from the detection layer.The film was then left to age for 7 days at 23°C and a relative humidity of 50%, thereby obtaining films with detection layers for Examples 1 to 5 and Comparative Example 1.

[0113] [evaluation] The evaluation of each example and comparative example is described below.

[0114] <Evaluation of observability in the visible light region> The detection layers in the films with a detection layer in Examples 1 to 5 and Comparative Example 1 were visually observed. Observability in the visible light region was evaluated based on the following criteria. The evaluation results are shown in Table 1. A: The detection layer is colorless and transparent. B: The detection layer is not colorless and transparent.

[0115] <Evaluation of observation in the ultraviolet region> The films with detection layers of Examples 1 to 5 and Comparative Example 1 were irradiated with ultraviolet light at a wavelength of 365 nm using an ultraviolet light, and the detection layers were visually observed. Observability in the ultraviolet region was evaluated based on the following criteria. The evaluation results are shown in Table 1. A: The detection layer is colored and the coloring can be clearly confirmed. B: The detection layer is colored, but the degree of coloring is weak. C: The detection layer is not colored.

[0116] <Tensile Modulus, Tensile Strength, and Elongation at Break of Resin Composition for Detection Layer> The tensile modulus, tensile strength, and elongation at break of the resin compositions for the detection layers of Examples 1 to 5 and Comparative Example 1 were measured in accordance with JIS K 6251:2017 at a measurement temperature of 23°C and a pulling rate of 2 mm / min. The measurement results are shown in Table 1.

[0117] <Defect detection and evaluation of the top layer> A weather-resistant paint (manufactured by Asia Kogyo Co., Ltd., product name: UC-840EG, paint containing UV absorber) was applied as a top layer to a PET film to a film thickness of 1 mm, and a PET film was attached to the side opposite the top layer PET film.The film was then cured at 23°C and a relative humidity of 50% for 7 days to obtain a film with a top layer having a film thickness of 1 mm. In addition, a film with a top layer having a thickness of 0.2 mm was prepared in the same manner as in the preparation of the film with a top layer having a thickness of 1 mm, except that the film thickness was 0.2 mm.

[0118] A 1 mm thick film with a top layer was placed on the film with the detection layer of Example 4, and ultraviolet light with a wavelength of 365 nm was irradiated from the side of the film with the top layer using an ultraviolet light, and the detection layer was visually observed. As a result, no coloration of the detection layer was confirmed.

[0119] A 0.2 mm thick film with a top layer was placed on the film with the detection layer of Example 4, and ultraviolet light with a wavelength of 365 nm was irradiated from the side of the film with the top layer using an ultraviolet light, and the detection layer was visually observed. As a result, coloration of the detection layer was confirmed.

[0120] Here, the film with a top layer having a thickness of 1 mm is assumed to be in a state where there is no defect in the top layer. The film with a top layer having a thickness of 0.2 mm is assumed to be in a state where there is a defect in the top layer. In other words, from the results of the defect detection evaluation of the top layer, it can be seen that the functional layer that constitutes the concrete structure of this embodiment can detect defects in the top layer.

[0121] [Table 1] [Explanation of symbols]

[0122] 10 Top Tier 20 Detection Layer 30 Functional Layers 50 Concrete 100 Concrete Structure

Claims

1. A concrete structure provided with a functional layer on concrete to protect, reinforce or repair the concrete, The functional layer is transparent in the visible light region, the functional layer comprises a top layer and a detection layer; the top layer is located as the outermost layer of the concrete structure and is a layer made of a resin composition (A) containing an ultraviolet absorber, A concrete structure, wherein the detection layer is a layer that becomes colored when irradiated with light in the ultraviolet region.

2. The concrete structure according to claim 1, wherein the resin composition (A) comprises at least one resin selected from the group consisting of a fluororesin, a silicone resin, a urethane resin, and a polyester resin.

3. 3. The concrete structure according to claim 1, wherein the resin composition (A) does not contain a colorant, or the content of the colorant in the resin composition (A) is less than 1% by mass when the total of all components in the resin composition (A) is 100% by mass.

4. The concrete structure according to claim 1 or 2, wherein the detection layer is a layer containing a resin composition (B) containing a colorant.

5. 5. The concrete structure according to claim 4, wherein the content of the colorant in the resin composition (B) is 0.001 mass% or more and 1 mass% or less when the total of all components in the resin composition (B) is 100 mass%.

6. The concrete structure of claim 4 , wherein the colorant comprises a phosphor.

7. 5. The concrete structure according to claim 4, wherein the resin composition (B) comprises at least one selected from the group consisting of a polyester resin, a (meth)acrylic resin, a modified silicone resin, a urethane resin, a urea resin, a urethane urea resin, and an epoxy resin.

8. The concrete structure according to claim 4, wherein the resin composition (B) has a tensile modulus of elasticity of 50 MPa or more and 5000 MPa or less.

9. The concrete structure according to claim 4, wherein the resin composition (B) is an adhesive resin composition.

10. 3. The concrete structure according to claim 1, wherein the concrete structure can be used under sunlight.

11. The method for manufacturing a concrete structure according to claim 1 or 2, forming the detection layer on the surface side of the concrete; and forming the top layer on the side of the detection layer opposite the concrete side.

12. 3. A method for detecting defects in the top layer of a concrete structure according to claim 1, comprising: A detection method comprising the step of irradiating the concrete structure with light in the ultraviolet region from the top layer side.

13. A resin composition capable of detecting defects in the outermost layer of a concrete structure having a functional layer on concrete that protects, reinforces, or repairs the concrete, comprising: The resin composition is transparent in the visible light region and becomes colored when irradiated with light in the ultraviolet region.

14. A resin composition set capable of protecting, reinforcing or repairing concrete, comprising: The resin composition (A) includes a resin composition (B), the resin composition (A) contains an ultraviolet absorber and is transparent in the visible light region; The resin composition set, wherein the resin composition (B) is transparent in the visible light region and becomes colored when irradiated with light in the ultraviolet region.

15. A concrete construction method selected from the group consisting of a spalling prevention construction method, a reinforcement construction method, and a surface protection construction method, forming a detection layer on the surface side of the concrete; and forming a top layer on the detection layer opposite the concrete side, the top layer is located as an outermost layer, is transparent in the visible light region, and is made of a resin composition (A) containing an ultraviolet absorber; A concrete construction method, wherein the detection layer is a layer that is transparent in the visible light region and that becomes colored when irradiated with light in the ultraviolet region.

16. A structure having a functional layer on an object, The functional layer is transparent in the visible light region, the functional layer comprises a top layer and a detection layer; the top layer is located as an outermost layer of the structure and is a layer made of a composition (A) containing an ultraviolet absorber, The detection layer is a layer that becomes colored when irradiated with light in the ultraviolet region.

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