TW202309384A - Structure protection sheet, and method for manufacturing reinforced structure - Google Patents

Abstract

Provided is a structure protection sheet that has exceptional strength and that makes it possible to greatly reduce the construction time when a protective layer is provided to the surface of a structure made of concrete, etc., and to protect the structure over an extended period of time. This structure protection sheet comprises a polymer cement hardened layer, which is provided on the structure side, and a resin layer, which is provided on the polymer cement hardened layer. The structure protection is characterized in that when the sheet is irradiated with light emitted by a xenon lamp for 72 hours, the light having a radiation intensity of 180 W/m 2, the rate of change in the moisture permeability between before and after the irradiation is not more than 35%.

Description

Structure protection sheet and method for manufacturing reinforced structure

The present invention relates to a structure protection sheet and a method for manufacturing a reinforced structure. More specifically, it relates to a structure protection sheet capable of greatly reducing the construction period for providing a protective layer on the surface of a structure such as concrete, and at the same time protecting the structure for a long time; and a method of manufacturing a structure reinforced with the structure protection sheet.

Civil engineering structures such as road bridges, tunnels, water gates and other river management facilities, sewer pipes, and seawalls need to be repaired or reinforced as they age. The repair work is to reapply the paint several times after repairing the defective part and the fragile part. On the other hand, in the reinforcement process, the reinforcement paint is repeatedly applied to the entire part to be reinforced several times.

In the repeated application of such repair works or reinforcement works, such as on concrete, primer, middle coat and top coat are done in sequence, but usually the middle coat or each application step cannot be used to dry the coating. Continuous application, such as base coat, first mid-coat, second mid-coat, first top coat, and second top coat for a total of 5 coats, requires at least 5 days duration. Moreover, since the coating is done outdoors, it is affected by the weather, and it may not be able to dry sufficiently in rainy days, or the coating process itself may not be performed. Therefore, it is difficult to shorten the construction period, and labor costs for this part are required. The quality of the project and the coating film (film thickness, surface roughness, water content, etc.) will be affected by the external environment (humidity, temperature, etc.) during the coating step. get stable results.

In addition, the coating is carried out by troweling or spraying, but the stable repair or reinforcement of a uniform coating mostly depends on the skills of technicians. Therefore, depending on the technique of the technician, the quality of the coating film will vary. Furthermore, with the aging of construction workers and the decrease in population, the number of workers in concrete repair and reinforcement work has decreased. Therefore, repair methods that can be easily carried out even by unskilled technicians are required.

As a technique for solving such a problem, for example, Patent Document 1 proposes a sheet and a method that can be simplified, cost-effectively shortened, and can reliably prevent deterioration of concrete. This technology is a sheet for concrete repair, which includes: an intermediate layer with a resin film; and a surface layer composed of a cloth material laminated with a resin layer on both sides, and is pasted on the concrete surface to be repaired with an adhesive for construction. , and a concrete repair method in which a paint is applied to the surface layer of the pasted sheet for concrete repair opposite to the concrete surface.

Furthermore, improvements have also been made regarding the coating material. For example, in Patent Document 2, it is proposed to prevent the reaction of alkaline aggregates, and it has excellent followability to cracks in concrete structures. Even if the temperature rises after the coating film is formed, the expansion of the coating film will not occur. Protection method of concrete structures with peeling coating materials. This technology is a method of forming a coating film of an underlying adjustment material on the surface of a concrete structure, and forming a coating film on the surface of the coating film. The primer coating film is formed of a composition containing a cationic (meth)acrylic polymer latex and an inorganic hydraulic substance. The coating film formed on the surface of the coating film of the primer adjustment material is a coating film formed of a composition containing an alkyl (meth)acrylate latex and an inorganic hydraulic substance, and the elongation rate at 20°C is 50~2000% , anti-chloride ion permeability (anti-chloride ion permeability) is 10 ^-2 ~10 ^-4 mg/cm ² . day, the water vapor transmission rate is 5g/m. More than one day, the film thickness is 100~5000μm. [Prior Art Documents] [Patent Documents]

[Patent Document 1] Japanese Patent Laid-Open No. 2010-144360 [Patent Document 2] Japanese Patent Laid-Open No. 2000-16886

[Problem to be solved by the invention]

Previous concrete repair pieces such as Patent Document 1 have a difference in adhesion between the base material and other layers (such as the adhesive layer and the reinforcing member); the difference in the elongation of the base material, the adhesive layer, and the reinforcing member; The problem of the following strength, etc., should be solved. Specifically, the base material and the reinforcing member are bonded with an adhesive layer, but when the concrete patch is constructed or the concrete patch after construction is stressed, the difference in elongation of the base material, the adhesive layer, and the reinforcing member, etc., This may cause delamination at the layer interface due to the difference between the adhesive force of the adhesive layer and the adhesive force of the adhesive layer and the reinforcing member.

In addition, the adhesive layer provided on the concrete patch is softened by heating to adhere to the concrete, but if sufficient adhesive strength cannot be obtained, the concrete patch may peel off from the concrete surface and fail to function as a patch. In addition, the concrete after the concrete patch is applied sometimes expands with time, and this phenomenon is considered to be because the water vapor inside the concrete loses the escape path due to the patch with low water vapor permeability.

In addition, the method of forming a coating film with a coating on site, as explained in the above-mentioned Background Art column, takes one day for each layer, and it takes 1 day to form a six-layer coating film from the primer layer to the top coat layer. 6 days, and there is a problem that it is difficult to stabilize the quality and characteristics such as film thickness error, surface roughness, and water content.

Furthermore, the repair objects of the concrete patch are usually large concrete components such as road bridges, tunnels, water gates and other river management facilities, sewer pipes, seawalls and other civil structures, so the concrete patch itself also requires sufficient The strength (referring to tensile strength, bending strength, hardness, surface strength, punching strength, toughness, etc., the same as in this specification below.), and the previous concrete patch, there is a problem that it is difficult to say that it has sufficient strength.

The present invention is made to solve the above problems, and its object is to provide a structure protection sheet that can greatly reduce the construction period when installing a protective layer on the surface of a structure such as concrete, and at the same time protect the structure for a long time, and use this A method for manufacturing a reinforced structure of a structure protection sheet. [means used to solve a problem]

The inventors of the present invention have studied a concrete protection sheet which can stably protect concrete for a long period of time without forming a layer with a coating tool on the concrete surface. As a result, the structure protection sheet is completed first, which is equipped with: a hardened layer of polymer cement, which further has the proper performance in the concrete protection sheet to give concrete characteristics, specifically, it can follow the cracks or expansion that occur in the concrete. Water resistance, resistance to penetration of water and chloride ions and other deterioration factors into the concrete, resistance to chloride ion penetration, resistance to neutralization, and water vapor penetration to discharge the water in the concrete as water vapor; and resin layer. However, in the structure protection sheet completed by the present inventors, the hardened layer of the polymer binder deteriorates due to exposure to sunlight, which may degrade the performance required for imparting concrete properties. Therefore, as a result of further intensive studies, the present inventors realized that the rate of change of water vapor transmission rate of the structure protection sheet before and after exposure to sunlight was within a specific range, and completed the present invention. Then, this technical idea can also be applied as a structure protection sheet to other structures that are not used for concrete.

(1) Regarding the structure protection sheet of the present invention, it is characterized in that: it is a structure provided with: a hardened layer of a polymer binder provided on the structure side; and a resin layer provided on the hardened layer of the polymer binder. The protective sheet has a moisture permeability change rate of 35% or less before and after being irradiated with a xenon lamp with a radiation intensity of 180W/m ² for 72 hours.

According to this invention, even if the hardened layer of the polymer binder is exposed to sunlight, deterioration of the imparted properties can be well prevented. In addition, since the structure protection sheet can be mass-produced in the coating step and drying step of the production line of the factory, it can realize cost reduction, greatly reduce the work period on site, and protect the structure for a long time.

In the structure protection sheet of the present invention, it is preferable that the hardened layer of the polymer binder is subjected to water absorption treatment.

According to this invention, deterioration of properties imparted to the hardened layer of the polymer cement upon exposure to sunlight can be favorably prevented.

Regarding the structure protection sheet of the present invention, wherein the water-absorbing treatment is selected from: a method of adding a water-absorbing polymer to the above-mentioned hardened polymer binder layer; a method of adding an inorganic water-absorbing substance to the above-mentioned polymer binder hardened layer ; The method of carrying out the aging treatment when making the above-mentioned polymer binder hardened layer in a high-humidity environment; The method of performing the heat treatment when forming the above-mentioned resin layer under a high-humidity environment; The method of water-containing sheet and the method of wet curing after applying the above-mentioned structure protection sheet are preferable.

According to this invention, the water absorption treatment of the hardened layer of the polymer binder can be well realized.

In the structure protection sheet of the present invention, the above-mentioned polymer binder hardened layer is a layer containing a binder component and a resin, and may contain a resin of 10% by weight or more and 40% by weight or less. Furthermore, it is more preferable that resin is 20 weight% or more and 30 weight% or less.

According to this invention, by controlling the ratio of the binder component and the resin component, it is easy to form the hardened layer of the polymer binder, and at the same time, since the hardened layer of the polymer binder is easy to become a layer with excellent followability and good compatibility, it is possible to improve the layer itself. tendency to adherence. Furthermore, the binder component contained in the polymer binder cured layer on the structure side functions to improve the adhesion to structures such as concrete.

(2) The present invention is a method of manufacturing a structure using the above-mentioned structure protection sheet of the present invention, characterized in that the above-mentioned structure protection sheet is pasted after applying an adhesive on the structure.

According to this invention, since the structure protection sheet which consists only of the layer which does not contain a base material or a reinforcing member is used, it can be easily adhered to the surface of a structure. As a result, even an unskilled worker can stably install a structure protection sheet with excellent strength on the surface of the structure, greatly reduce the construction period, and protect the structure for a long time.

In the method of manufacturing a reinforced structure according to the present invention, a primer layer may be provided between the above-mentioned structure and the above-mentioned adhesive.

According to this invention, since the undercoat layer is provided between the structure and the adhesive, it has the effect of improving mutual adhesion, so the structure protection sheet can protect the structure stably for a long time. [Effect of the invention]

According to the present invention, even when it is pasted on the surface of a structure such as concrete and exposed to sunlight, since the change rate of water vapor transmission rate is within a predetermined range, it is possible to prevent deterioration of the given performance and to provide long-term protection. A structure protection sheet on the surface of a structure, and a method for manufacturing a structure reinforced with the structure protection sheet. In particular, it is possible to provide the structure protection sheet with the performance required for the structure characteristics, to follow the cracks or swelling that occur in the structure, to prevent the penetration of deterioration factors such as water and chloride ions into the structure, and to have the ability to protect the structure. A structure protection sheet that discharges moisture in structures or penetrating factors of deterioration, and enhances strength. Furthermore, it has the advantage that quality stability and uniformity can be improved compared with conventionally applied layers formed by hand coating.

Hereinafter, the structure protection sheet of this invention and the concrete structure reinforced using it are demonstrated with reference to drawings. In addition, the present invention can be modified in various ways as long as it has its technical features, and is not limited to the following description and the forms in the drawings.

[Structure Protection Sheet] Regarding the structure protection sheet 1 of the present invention, as shown in Fig. 1 or Fig. 2 (C), it is equipped with: a polymer cement hardened layer 3 arranged on the structure 21 side; The resin layer 2. The two layers of the polymer binder hardened layer 3 and the resin layer 2 can be formed as a single layer or laminated. In addition, other layers may be provided between the polymer binder cured layer 3 and the resin layer 2 depending on the required performance.

The structure protection sheet 1 of the present invention has a moisture permeability change rate of 35% or less before and after irradiation with a xenon lamp with a radiation intensity of 180 W/m ² for 72 hours. The above moisture permeability change rate is calculated by taking N1: moisture permeability before xenon lamp irradiation; N2: moisture permeability after xenon lamp irradiation, {(N2-N1)/N2}×100. If the change rate of the above-mentioned moisture permeability exceeds 35%, there is a problem that the performance imparted by exposure to sunlight will deteriorate when the structure protection sheet 1 of the present invention is pasted on the surface of the structure. The preferable lower limit of the rate of change of the above-mentioned water vapor transmission rate is 0%, and the preferable upper limit is 20%. In addition, the said moisture permeability is the value measured according to JIS Z0208:1976.

The reason why the deterioration of the performance imparted to the structure protection sheet 1 of the present invention can be prevented by specifying such a moisture permeability change rate is as follows. The polymer binder hardened layer 3 is a layer containing a binder component and a resin component as described later. In the manufactured structure protection sheet 1 of the present invention, the polymer binder hardened layer 3 is absorbed by the contained moisture. Continued hardening reaction changes into a stronger layer. When sticking the structure protection sheet 1 of the present invention to the surface of the structure 21, with the previous structure protection sheet, the moisture content in the polymer cement hardened layer 3 will be affected by sunlight (in addition, placed Also in a high-temperature environment) will be reduced, and the hardening reaction of the polymer binder hardened layer 3 will change over time, which may cause a problem that it cannot be fully hardened. Therefore, regarding the structure protection sheet 1 of the present invention, xenon lamp irradiation simulating sunlight irradiation is performed under predetermined conditions, and the upper limit of the change rate of water vapor transmission rate is limited.

In order to satisfy such a change rate of moisture permeability, for example, in the structure protection sheet 1 of the present invention, it is preferable to apply water absorption treatment to the hardened polymer cement layer 3 . The above-mentioned water absorption treatment is a treatment that can hold moisture in the polymer cement hardened layer 3. By applying water absorption treatment, the moisture retention rate in the polymer cement hardened layer 3 can be maintained, and the above-mentioned moisture permeability change can be satisfied. Rate.

As the above-mentioned water-absorbing treatment, for example, a method selected from: a method of adding a water-absorbing polymer to the hardened polymer binder layer 3; a method of adding an inorganic water-absorbing substance to the polymer binder hardened layer 3; A method of performing aging treatment in a high-humidity environment in the hardened binder layer 3; a method of performing heat treatment in forming the resin layer 2 in a high-humidity environment; a method of providing a water-containing sheet that absorbs moisture in the hardened polymer binder layer 3 ; Any method of the group consisting of methods of wet curing after the structure protection sheet 1 is constructed.

In the method of adding a water-absorbing polymer to the polymer binder cured layer 3, examples of the water-absorbing polymer include Aqualick CA (manufactured by Nippon Shokubai Co., Ltd.). As content of the said water-absorbent polymer, for example, 0.15-0.30 mass parts is preferable with respect to 100 mass parts of resin components in the polymer cement cured layer 3. If it is less than 0.15 parts by mass, the rate of change in water vapor transmission rate of the structure protection sheet 1 of the present invention may increase, and if it exceeds 0.30 parts by mass, the coating may become thicker and cannot be coated.

In the method of performing the aging treatment during the production of the above-mentioned polymer cement hardened layer 3 in a high-humidity environment, the so-called high-humidity environment is preferably under an environment with a humidity of 50%RH or less. In addition, as the above-mentioned aging treatment, specifically, a treatment of leaving the polymer cement hardened layer 3 in the above-mentioned high-humidity environment for 24 to 72 hours can be mentioned.

In the method of performing the heat treatment at the time of forming the above-mentioned resin layer 2 in a high-humidity environment, the above-mentioned high-humidity environment includes the above-mentioned environment. Materials and the like are appropriately determined, for example, 60 to 80°C is preferable.

In the method of providing a water-containing sheet that absorbs water on the above-mentioned polymer binder hardened layer 3, as the above-mentioned water-containing sheet, for example, one that contains water such as a non-woven fabric can be mentioned. In addition, the above-mentioned water-containing sheet may be embedded in the polymer cement hardened layer 3, or may be provided on the surface of the polymer cement hardened layer 3 on the resin layer 2 side, or on the polymer cement hardened layer. 3 on the side opposite to the resin layer 2 side.

The method of wet curing after construction of the above-mentioned structure protection sheet 1 can include the same method as the method previously carried out for accelerating the hardening of the cement. Specifically, the hardened cement is wrapped in a water-retaining sheet. It is better to live.

The structure protection sheet 1 of the present invention preferably has a thickness distribution within ±100 μm. In this structure protection sheet 1 , by making the thickness distribution within the above-mentioned range, even an unskilled worker can stably provide a layer with a small thickness error on the surface of the structure 21 . In addition, by controlling the thickness distribution within the above-mentioned range, it is easy to uniformly reinforce the structure. The hardened polymer cement layer 3 provided on the side of the structure 21 has excellent adhesion to the structure 21, and at the same time, by having the conventional primer 5, the steps of coating and drying the adhesive become unnecessary. In addition, the resin layer 2 disposed on the hardened polymer binder layer 3 can impart properties such as water resistance, chloride ion penetration resistance, and neutralization resistance. In addition, since the structure protection sheet 1 can be mass-produced in the production line of the factory through the coating step and the drying step, it is possible to reduce costs, significantly reduce the work period on site, and achieve long-term protection of structures. As a result, the construction period for bonding the surface of the structure 21 can be greatly reduced, and the structure 21 can be protected for a long time.

Specific examples of each component will be described in detail below.

(structure) The structure 21 is a counterpart member to which the structure protection sheet 1 according to the present invention is applied. As the structure 21, the structure which consists of concrete is mentioned. The above-mentioned concrete is generally obtained by grouting and curing a cement composition containing at least cement-based inorganic substances, aggregates, admixture, and water. Such concrete is widely used in civil engineering structures such as river management facilities such as road bridges, tunnels, and water gates, sewer pipes, and seawalls in ports. In the present invention, by applying the structure protection sheet 1 to the structure 21 composed of concrete, it is possible to follow the cracks or expansion that occur in the concrete, and prevent deterioration factors such as water and chloride ions from penetrating into the concrete. The special advantage is that the moisture in the concrete is released as water vapour.

(polymer binder hardened layer) The hardened polymer cement layer 3 is a layer arranged on the structure side as shown in FIG. 2(C). This polymer cement hardened layer 3 can be a single layer or a laminated layer. It can be made into a single layer or laminated, and the overall thickness, function (followability, adhesion to structures, etc.) and factory manufacturing can be considered. Lines, production costs, etc. can be set arbitrarily. For example, if the production line is short and the predetermined thickness cannot be achieved with a single layer, it can be formed by repeatedly applying two or more layers. Furthermore, for example, repeated application of 2 layers forms the 2nd layer after drying the 1st layer. In addition, the hardened polymer binder layer 3 may be formed by laminating layers with different properties. For example, on the side of the resin layer 2, a layer with a higher proportion of the resin component is made, and the layer with a higher resin component is bonded to the resin layer 2, while the layer with a higher cement component is bonded to the concrete structure 21, so as to form a bond between the two. Adherence is very good.

The polymer binder cured layer 3 is obtained by coating a resin (resin component) containing a binder component as a paint-like coating. Furthermore, when a method of adding a water-absorbing polymer or an inorganic water-absorbing substance to the polymer binder hardened layer 3 is employed as the water-absorbing treatment, the water-absorbing polymer or an inorganic water-absorbing substance is added to the above-mentioned paint. Examples of the above-mentioned cement component include various cements, limestones containing components composed of calcium oxide, viscosities containing silica, and the like. Among them, a cement is preferred, and examples thereof include Portland cement, alumina cement, early-strength cement, and fly ash cement. Which kind of cement is selected is selected according to the characteristics that the polymer cement hardened layer 3 should have, for example, the degree of followability to the concrete structure 21 is considered. In particular, Portland cement specified in JIS R5210 can be taken out favorably.

Examples of the resin component include acrylic resins, acrylic urethane resins, acrylic silicone resins, fluororesins, soft epoxy resins, polybutadiene rubbers, acrylic resins exhibiting rubber properties (for example, acrylate Synthetic rubber as the main component), etc. Such a resin component is the same as the resin component constituting the resin layer 2 described later, and is preferable from the viewpoint of improving the adhesiveness between the cured polymer cement layer 3 and the resin layer 2 . Moreover, any of thermoplastic resin, thermosetting resin, and photocurable resin can be used for the said resin component. The term "hardening" of the polymer binder hardened layer 3 is not limited to thermosetting resins or photohardening resins, etc., and the resin component hardens the polymerized resin, but means that as long as it becomes the final layer, it will harden. The material can mean.

The content of the above-mentioned resin component is appropriately adjusted according to the materials used, etc., and the total amount of the cement component and the resin component is preferably 10% by weight or more and 40% by weight or less. If it is less than 10% by weight, the adhesiveness to the resin layer 2 tends to decrease and it is difficult to maintain the polymer cement hardened layer 3 as a layer, and if it exceeds 40% by weight, the adhesiveness to the concrete structure 21 may deteriorate. Insufficient. From the above-mentioned point of view, the content of the above-mentioned resin component is preferably in the range of 15% by weight or more and 35% by weight or less, and more preferably 20% by weight or more and 30% by weight or less.

The paint used to form the hardened polymer binder layer 3 is a coating solution in which a binder component and a resin component are mixed with a solvent. Regarding the resin composition, latex is preferred. For example, acrylic latex is polymer microparticles obtained by emulsifying and polymerizing monomers such as acrylates using an emulsifier. As an example, one or more monomers or monomer mixtures containing acrylates and methacrylates, Acrylic polymer latex formed by polymerization in water prepared with surfactant. The content of acrylate and the like constituting the acrylic latex is not particularly limited, and is selected from the range of 20 to 100% by weight. In addition, the amount of the surfactant to be prepared according to need is not particularly limited, and the surfactant is prepared to the extent that it can be latex.

The polymer binder hardened layer 3 is formed by coating the coating solution on the release sheet, and then drying to remove the solvent (preferably water). For example, a mixed composition of a binder component and acrylic latex is used as a coating liquid to form a polymer binder hardened layer 3 . Furthermore, the resin layer 2 may be formed after the polymer binder hardened layer 3 is formed on the release sheet, or the polymer binder hardened layer 3 may be formed after the resin layer 2 is formed on the release sheet. Specifically, for example, a resin layer is coated on engineering paper as a release sheet, the dried polymer binder is coated with a coating liquid, and the Young's modulus adjustment layer is bonded in a wet state before drying, and then dried. . Afterwards, the coating solution for the polymer binder is further coated on the surface to which the Young's modulus adjustment layer is bonded, and dried to obtain a structure in which the Young's modulus adjustment layer exists in the hardened polymer binder layer of the present invention. Protective sheet. In addition, it is also possible to coat the resin layer on the engineering paper used as the release sheet, coat the dried polymer binder with the coating liquid, and bond the Young's modulus adjustment layer in the wet state before drying, without In the step of drying it, the coating solution for the polymer binder is further coated on the surface to which the Young's modulus adjustment layer is bonded, and then by drying the whole, Young's modulus can be obtained in the hardened layer of the polymer binder according to the present invention. Factor adjustment layer structure protection sheet.

The thickness of the polymer cement hardened layer 3 is not particularly limited, and can be used according to the use form of the structure 21 (the civil and engineering structures such as road bridges, tunnels, water gates, etc., sewer pipes, port seawalls, etc.), through The age, shape, etc. can be set arbitrarily. As a specific thickness of the hardened polymer cement layer 3, for example, it may be in the range of 0.5 mm to 1.5 mm. As an example, when the thickness is 1 mm, the thickness error is preferably within ±100 μm. Such precise thickness cannot be realized on-site, but can be achieved by stabilizing the coating in the factory's manufacturing line. Furthermore, even when it is thicker than 1 mm, the thickness error can be kept within ±100 μm. In addition, when it is thinner than 1mm, the thickness error can be made smaller.

This polymer binder hardened layer 3 is easier for water vapor to permeate than the resin layer 2 described later due to the presence of the binder component. The water vapor transmission rate at this time is, for example, 20~60g/m ² . day degree. Furthermore, the binder component, for example, has good compatibility with the binder component constituting concrete, and can be made to have excellent adhesion to the concrete surface. In addition, as shown in FIG. 2, when the primer layer 22 and the adhesive 23 are sequentially provided on the surface of the structure 21, the hardened polymer cement layer 3 containing the adhesive component and the adhesive 23 are adhered with good adhesion. . In addition, since the hardened polymer cement layer 3 is extensible, even when the structure 21 cracks or expands, it can follow the changes of the concrete.

(resin layer) The resin layer 2 is, as shown in FIG. 2(C), arranged on the side opposite to the structure 21 and appears on the surface. The resin layer 2 may be, for example, a single layer as shown in FIG. 1(A), or may be a laminate of at least two layers as shown in FIG. 1(B). Make a single layer or multiple layers, the overall thickness, consider the functions to be given (water resistance, chloride ion permeability resistance, neutralization resistance, water vapor permeability, etc.), the length of the factory production line, production costs, etc., for example, manufacturing If the line is too short to achieve the desired thickness with a single layer, it can be formed by repeated application of 2 or more layers. Again, repeat the application, applying the 2nd coat after the 1st coat dries. Layer 2 is left to dry afterwards.

The resin layer 2 is a paint coating that can form a resin layer that has flexibility, can follow cracks or cracks that occur in concrete, and is excellent in water resistance, chloride ion penetration resistance, neutralization resistance, and water vapor penetration. Layer upon layer. Examples of the resin constituting the resin layer 2 include acrylic resins exhibiting rubber characteristics (for example, synthetic rubber mainly composed of acrylate), acrylic urethane resins, acrylic silicone resins, fluororesins, and flexible epoxy resins. , Polybutadiene rubber, etc. This resin material is preferably one having the same composition as the resin constituting the above-mentioned polymer cement layer 2 . In particular, a resin containing an elastic film forming component such as rubber is preferable.

Among them, the acrylic resin exhibiting rubber characteristics is preferably composed of an acrylic rubber-based copolymer aqueous latex in terms of safety and coating properties. In addition, the proportion of the acrylic rubber-based copolymer in the latex is, for example, 30 to 70% by weight. Acrylic rubber-based copolymer latex can be obtained, for example, by emulsification polymerization of monomers in the presence of a surfactant. Any of anionic, nonionic, and cationic surfactants can be used.

The paint used to form the resin layer 2 is to prepare a mixed coating solution of a resin composition and a solvent, apply the coating solution on a release sheet, and then remove the solvent by drying to form the resin layer 2 . The solvent may be water or a water-based solvent, or may be an organic solvent such as xylene mineral spirits. In Examples described later, the resin layer 2 was produced from an acrylic rubber composition using an aqueous solvent. Furthermore, the order of the layers formed on the release sheet is not limited, for example, it can be the sequence of resin layer 2, polymer binder hardened layer 3 as described above, or it can be polymer binder hardened layer 3, resin layer 2 in order. However, as shown in the above examples, it is preferable to form the resin layer 2 on the release sheet and then form the polymer adhesive hardened layer 3 .

The thickness of the resin layer 2 can be arbitrarily set according to the use form of the structure 21 (river facilities such as road bridges, tunnels, water gates, sewer conduits, seawalls of ports, etc.), age, shape, and the like. As an example, it may be any thickness within the range of 50 to 150 μm, and the thickness error thereof is within ±50 μm. Such precise thickness cannot be realized on-site, but can be achieved by stabilizing the coating in the factory's manufacturing line.

Although the resin layer 2 has high water resistance, chloride ion penetration resistance, and neutralization resistance, it is preferred that it can penetrate water vapor. As the water vapor transmission rate at this time, for example, 10~50g/m ² . The degree of day is good. Thereby, the structure protection sheet 1 can have high water resistance, chloride ion penetration resistance, neutralization resistance, and predetermined water vapor permeability. Furthermore, by being composed of the same resin component as that of the polymer cement hardened layer 3, the compatibility with the polymer cement hardened layer 3 is good, and excellent adhesion can be achieved. Water vapor permeability is measured in accordance with JIS Z0208 "Test method for moisture permeability of moisture-proof packaging materials".

In addition, the resin layer 2 may contain a pigment from the viewpoint of the color change of the structure protection sheet 1 of the present invention. In addition, the resin layer 2 may contain inorganic substances. Scratch resistance can be imparted to the resin layer 2 by containing an inorganic substance. It does not specifically limit as said inorganic substance, For example, conventionally known materials, such as metal oxide particle|grains of silicon dioxide, aluminum oxide, and titanium dioxide, are mentioned. Furthermore, the resin layer 2 may also contain a known antifouling agent. Regarding the structure protection sheet of the present invention, since it is used for the repair of concrete structures generally installed outdoors, the resin layer 2 is mostly polluted, and the structure protection of the present invention can be well prevented by containing an antifouling agent. Tablets are contaminated. It does not specifically limit as said antifouling agent, Conventionally known materials are mentioned. Moreover, the resin layer 2 may contain the additive which can provide various functions. Examples of such additives include cellulose nanofibers and the like.

(other constitutions) The manufactured structure protection sheet 1 may have a release sheet on the side of the polymer adhesive hardened layer 3 and the resin layer 2 . The release sheet, for example, can protect the surface of the structure protection sheet 1 when it is delivered to the construction site. layer 22 or adhesive 23), and then the release sheet can be easily peeled off, which can greatly improve the workability at the construction site. Furthermore, the release sheet is preferably engineering paper used in the production steps of the structure protection sheet 1 .

The material etc. of the engineering paper used as a release sheet are not specifically limited as long as it is conventionally known and used for a manufacturing process. For example, a laminated paper containing an olefin resin layer such as polypropylene or polyethylene or a silicon layer is used like conventional engineering paper. The thickness is also not particularly limited, as long as it does not hinder handling in terms of manufacture and construction, and may be any thickness of about 50 to 500 μm, for example.

In the structure protection sheet 1 described above, since the change rate of the water vapor transmission rate is controlled below a predetermined value, even when exposed to sunlight, deterioration of the imparted performance can be well prevented, and the structure 21 such as concrete can be protected for a long time. In particular, by giving the structure protection sheet 1 properties according to the characteristics of the structure 21, it is possible to follow the cracks or swelling that occur in the structure 21, and prevent deterioration factors such as water and chloride ions from penetrating into the structure 21. Penetration of moisture or deteriorating agent emissions from structures. Then, since such a structure protection sheet 1 can be manufactured in a factory, it can be mass-produced with stable characteristics and high quality. As a result, it is possible to shorten the construction period and reduce the labor cost without relying on the technical skills of the technicians.

[Manufacturing method of structure reinforced with structure protection sheet] As shown in FIG. 2 , it uses the construction method of the above-mentioned structure protection sheet 1 of the present invention, and is characterized in that: coating on the structure 21 The structure protection sheet 1 is pasted after the cloth adhesive 23 . With this construction method, the structure protection sheet 1 can be easily bonded to the surface of the structure 21 . As a result, even an unskilled worker can install the structure protection sheet 1 made of a layer with a small thickness error on the structure 21, greatly reducing the construction period and protecting the structure 21 for a long time.

FIG. 2 is an explanatory diagram of a construction method of the structure protection sheet 1 (a method of manufacturing a reinforced structure). In construction, as shown in FIG. 2(A), a primer layer 22 is formed on the surface of a structure 21 . The undercoat layer 22 is formed by mixing a coating liquid such as epoxy resin and a solvent, coating the structure 21, and then volatilizing and drying the solvent in the coating liquid. As a solvent in this case, water etc. which are the same as those mentioned above are mentioned. The thickness of the undercoat layer 22 is not particularly limited, and may be, for example, within a range of 100 to 150 μm. The primer layer 22 provided between the structure 21 and the adhesive 23 can enhance mutual adhesion, so the structure protection sheet 1 can protect the structure 21 stably for a long time. Furthermore, when a crack or a chip occurs in the structure 21, the primer layer 22 is provided after repairing it. In addition, repairing is not particularly limited, and cement mortar, epoxy resin, or the like is generally used.

After the undercoat layer 22 is formed, an adhesive 23 is applied as shown in FIG. 2(B). The applied adhesive 23 is not allowed to dry, but as shown in FIG. 2(C), the structure protection sheet 1 is bonded thereon. Examples of the adhesive 23 include urethane-based adhesives, epoxy-based adhesives, and acrylic resins exhibiting rubber characteristics (for example, synthetic rubber mainly composed of acrylate). In particular, the adhesive agent 23 made of the same type of resin component as the resin component of the polymer cement hardened layer 3 constituting the structure protection sheet 1 is more effective because the adhesive strength with the polymer cement hardened layer 3 becomes higher. good. The thickness of the adhesive 23 is not particularly limited. Adhesive 23 is usually applied to concrete with tools such as brushing or spraying, and then hardens through natural drying over time.

FIG. 3 is an explanatory view showing an example in which the structure protection sheet 1 is applied to a cast-in-place method. The so-called cast-in-place construction method is a construction method in which a formwork 24 is formed at the work site, a concrete composition 21' is poured into the formwork 24, and the structure 21 is obtained by leaving it to harden. After the hardened concrete structure 21 is formed by this cast-in-place method, by adhering the structure protection sheet 1 on the surface, the structure 21 that does not easily deteriorate can be produced. When bonding, the primer layer 22 is applied on the surface of the concrete structure 21. After drying, the structure protection sheet 1 is bonded after the adhesive agent 23 is coated thereon. After that, usually, the adhesive agent 23 is left to dry and harden, and the structure protection sheet 1 is adhered.

On the other hand, for the structure 21 where cracks or the like have occurred, after repairing the missing part, the structure protection sheet 1 is bonded by the same construction method as above. Thereby, the lifetime of the concrete structure 21 can be extended. [Example]

The present invention will be described more specifically by way of examples and comparative examples.

(Example 1) A release sheet with a thickness of 130 μm made of PP laminated paper was used. Here, the resin layer was formed on the release sheet as follows. First, a latex composition containing 60 parts by mass of acrylic silicone resin; 25 parts by mass of titanium dioxide; 10 parts by mass of iron oxide; and 5 parts by mass of carbon black was prepared. After coating this latex composition on the above-mentioned release sheet, it was heat-treated to harden it to form a resin layer. The thickness of the resin layer was set to 0.1 mm. Next, a polymer binder hardened layer is formed on the resin layer. Specifically, "ARONBULLCOAT A450X SETTER" (manufactured by Toagosei Co., Ltd.) was used as the binder, and "ACRYSET EMN-325E" (manufactured by Nippon Shokubai Co., Ltd.) was used as the resin component. Furthermore, the polymer binder layer obtained by applying and drying the mixed polymer binder cured layer-forming composition contained 0.08 parts by mass of a water-absorbing polymer to 100 parts by mass of the resin component. Composite layers containing 50% by weight of binder species. The composition for forming the hardened layer of the polymer binder was applied on the resin layer, and the composition for forming the hardened layer of the polymer binder was coated on the resin layer to a thickness of 1.0 mm before drying, and then coated at 80 After drying under the conditions of 50° C. and 50 minutes, aging was carried out for 3 days at a humidity of 50% RH and 80° C. to form a hardened polymer binder layer 3 with a thickness of 1.29 mm. In this way, structure protection sheets with a total thickness of 1.39 mm were produced. In addition, this structure protection sheet is continuously produced in a factory controlled at about 25°C, and is wound up into a roll form including a release sheet.

(Example 2-12) A structure was produced in the same manner as in Example 1, except that the adhesive type and resin component were changed to those described in Table 1, and the compounded amount of the water-absorbing polymer, drying time, and humidity during aging were changed as described in Table 1. Protective sheet.

(Comparative example 1~6) Except not having added a water-absorbing polymer, it carried out similarly to Examples 1-6, and produced the structure protection sheet about Comparative Examples 1-6, respectively.

[Table 1] Amount of water-absorbent polymer added (parts by mass) Type of cement resin composition Humidity (during aging) drying time Example 1 0.08 ARON BULL EMN 50%RH 50min Example 2 0.08 Japan STUCCO EMN 95%RH 60min Example 3 0.08 Pacific CEMENT Blast Furnace CEMENT B ARON BULL general dryer 40min Example 4 0.08 UBE U Grout KOTE 50%RH 40min Example 5 0.08 SUNHOME waterproof CEMENT ARON BULL 95%RH 50min Example 6 0.08 HOME CHEMICALS WEIGHT RESISTANT CEMENT KOTE general dryer 60min Example 7 0.13 ARON BULL KOTE 95%RH 40min Example 8 0.13 Japan STUCCO KOTE general dryer 50min Example 9 0.13 Pacific CEMENT Blast Furnace CEMENT B EMN 50%RH 60min Example 10 0.13 UBE U Grout ARON BULL 95%RH 60min Example 11 0.13 SUNHOME waterproof CEMENT EMN general dryer 40min Example 12 0.13 HOME CHEMICALS WEIGHT RESISTANT CEMENT ARON BULL 50%RH 50min Comparative example 1 - ARON BULL ARON BULL general dryer 60min Comparative example 2 - Japan STUCCO ARON BULL 50%RH 40min Comparative example 3 - Pacific CEMENT Blast Furnace CEMENT B KOTE 95%RH 50min Comparative example 4 - UBE U Grout EMN general dryer 50min Comparative Example 5 - SUNHOME waterproof CEMENT KOTE 50%RH 60min Comparative example 6 - HOME CHEMICALS WEIGHT RESISTANT CEMENT EMN 95%RH 40min In Table 1, "ARONBULL" of the binder type means "ARONBULLCOAT A-450X SETTER" (manufactured by Toagosei Co., Ltd.), "Nippon STUCCO" means "SPRING COAT KOTE" (manufactured by Japan STUCCO Co.), and "EMN " means "ACRYSET EMN-325E" (manufactured by Nippon Shokubai Co., Ltd.), "ARONBULL" means "ARONBULLCOAT A-450X BASE" (manufactured by Toagosei Co., Ltd.), "KOTE" means SPRING COAT KOTE" (manufactured by Japan STUCCO Co., Ltd. ).

[Measurement of Moisture Permeability] The moisture permeability of the structure protection sheets obtained in Examples and Comparative Examples was measured using a cup method (in compliance with JIS Z0208:1976). Next, the structure protection sheets of the obtained examples and comparative examples were irradiated with light for 72 hours at a radiation intensity of 180 W/ ^m2 using a xenon lamp, and the water vapor transmission rates before and after irradiation were measured by the cup method in accordance with JIS Z0208:1976, and the water vapor transmission rates were calculated. rate of change of humidity. Grouped into Examples 1-6 (group 1) with 0.08 parts by mass of water-absorbing polymer added, Examples 7-12 (group 2) with 0.13 parts by mass added, and comparative examples 1-6 without addition (group 3 ), calculate the average value of the water vapor transmission rate before and after the xenon lamp irradiation of each group. The results are shown in Fig. 4 . As shown in FIG. 4 , the average values of the change rates of water vapor transmission rates of Group 1 and Group 2 in Examples in which water-absorbent polymers were added were 32.1% and 15.0%, and in the groups of Comparative Examples in which water-absorbent polymers were not added The average value of the rate of change in water vapor transmission rate of Group 3 was 59.1%. In addition, the rate of change of the water vapor transmission rate of the structure protection sheet of the Example was 35% or less.

1: Structure protection sheet 2: resin layer 3: Polymer binder hardened layer 5: Primer coating layer 21: Structure (concrete) 21': Concrete composition (structure forming composition) 22: Base coat 23: Adhesive 24: Formwork

Fig. 1 is a cross-sectional view showing an example of a structure protection sheet according to the present invention. Fig. 2 is an explanatory diagram of a construction method of a structure protection sheet. Fig. 3 is an explanatory view showing an example in which a structure protection sheet is applied to a cast-in-place method. FIG. 4 is a graph showing the results of the rate of change in water vapor transmission rates in Examples and Comparative Examples.

1: Structure protection sheet

2: resin layer

3: Polymer binder hardened layer

4: Release sheet

5: Primer coating layer

21: Concrete structures

Claims (6)

A structure protection sheet, characterized in that: it is equipped with: a hardened layer of a polymer adhesive on the structure side; and a structure protection sheet provided on a resin layer of the polymer adhesive hardened layer, with radiation The change rate of water vapor transmission rate before and after 72 hours of 180W/m ² xenon lamp irradiation is 35% or less. The structure protection sheet according to claim 1, wherein the hardened layer of the polymer binder is subjected to water absorption treatment. Such as the structure protection sheet of claim 2, wherein the above-mentioned water absorption treatment is selected from: a method of adding a water-absorbing polymer to the above-mentioned polymer cement hardened layer; a method of adding an inorganic water-absorbent substance to the above-mentioned polymer cement hardened layer ; The method of carrying out the aging treatment when making the above-mentioned polymer binder hardened layer in a high-humidity environment; The method of performing the heat treatment when forming the above-mentioned resin layer under a high-humidity environment; The method of water-containing sheet; any method of the group consisting of the method of wet curing after construction of the above-mentioned structure protection sheet. The structure protection sheet according to claim 1, 2 or 3, wherein the above-mentioned polymer binder hardened layer is a layer containing a binder component and a resin, and contains the above-mentioned resin at 10% by weight or more and 40% by weight or less. A method of manufacturing a reinforced structure, which is a method of manufacturing a structure reinforced by the structure protection sheet of claim 1, 2, 3 or 4, characterized in that the above-mentioned Structure protection sheet. The method of manufacturing a reinforced structure according to claim 5, wherein a primer layer is provided between the structure and the adhesive.

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