JP2015124279A - Manufacturing method of adhesive and synthetic floor slab, and adherence method of rustproofing steel and concrete - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology to control corrosion of rustproofing steel while improving adhesion between the rustproofing steel and concrete.SOLUTION: Adhesive 4 is intervened between rustproofing steel 5 and concrete 6, improves adhesion between the rustproofing steel 5 and the concrete 6, and contains acrylic resin emulsion containing acrylic resin as synthetic resin element and cement. The glass transition point (°C) of the synthetic resin element is -35 to -5°C. The cement is blended in the ratio of 50 to 190 pts.mass for 100 pts.mass of non-volatile component of the acrylic resin emulsion.

Description

  The present invention relates to an adhesive, a method for producing a synthetic slab, and a method for closely attaching a rust-proof steel material to concrete.

  In civil engineering structures such as bridges, steel / concrete composite floor slabs (hereinafter simply referred to as composite floor slabs) made of concrete placed in a form made of steel plates are used (for example, Patent Document 1). 2). Since this type of synthetic floor slab is used after being exposed to the outdoors, the surface of the steel sheet used is usually subjected to a rust prevention treatment by hot dip galvanization or the like. Moreover, other steel materials, such as a reinforcing bar, are used for the synthetic floor slab other than the steel plate mentioned above, and the surface of such a steel material is also rust-proofed as needed.

JP-A-8-253909 JP-A-11-303022

  Even with synthetic floor slabs using steel materials such as steel plates that have been subjected to anti-rust treatment (hereinafter referred to as anti-rust steel materials), there is a gap at the interface between the anti-rust steel material and concrete over time, and rainwater, etc. May enter and corrode the rust-proof steel. For example, in the case of a composite floor slab used for a bridge, a gap is particularly likely to occur at the interface between a rust-proof steel material and concrete because vibrations due to traveling of automobiles and railway vehicles are always received.

  In addition, in the past, there was no recognition that the concrete adhesion to rust-proof steel materials coated with zinc rich paint, etc. (especially long-term adhesion of several years to several decades) was poor. In the structure such as the composite floor slab, the adhesion between the rust-proof steel and the concrete has not been considered.

  The objective of this invention is providing the technique which suppresses corrosion of a rust preventive steel material, improving the adhesiveness between a rust preventive steel material and concrete.

  Based on the knowledge that the concrete has poor adhesion to the rust-proof steel material on which the rust-proof layer is formed, the present inventors have intensively studied to achieve the above-mentioned purpose. It was found that the contained adhesive can suppress the corrosion of the rust-proof steel material while improving the adhesion between the rust-proof steel material and the concrete, and the present invention has been completed.

  The adhesive of the present invention is an adhesive that is interposed between a rust-proof steel and concrete, and improves the adhesion between the rust-proof steel and concrete, and includes an acrylic resin as a synthetic resin component A resin emulsion and cement, and the glass transition point (° C.) of the synthetic resin component is −35 to −5 ° C., and the cement is contained in 100 parts by mass of the nonvolatile content of the acrylic resin emulsion. It mix | blends in the ratio of 50-190 mass parts, It is characterized by the above-mentioned.

  The synthetic floor slab manufacturing method of the present invention is a rust-proof steel plate in which a rust-proof layer comprising a hot-dip galvanized or zinc-containing coating film or an epoxy resin film is formed on the surface of the steel sheet. A synthetic floor slab manufacturing method in which a concrete floor slab is manufactured by placing concrete on a mold form comprising an acrylic resin emulsion and cement on the rust-proof steel plate constituting the form frame. A step of applying a layered adhesive so as to overlap the anticorrosive layer, and a step of placing the concrete on the mold to which the adhesive is applied so that the adhesive overlaps the adhesive. .

  In the synthetic floor slab manufacturing method, the mold may constitute a haunch part in a structure such as a bridge, and the adhesive may be applied to at least the haunch part of the mold. .

  Further, the adhesion method between the rust-proof steel material and the concrete according to the present invention is a galvanizing or zinc-containing paint film or an anti-rust layer formed of an epoxy resin film on the surface of the steel material. For the rust steel material, an adhesive application step in which an adhesive containing an acrylic resin emulsion and cement is applied in layers so as to overlap the rust preventive layer, and an anti-rust steel material with an adhesive is obtained, and with the adhesive A concrete application step is provided in which concrete is applied to the rust-proof steel material so as to overlap the adhesive, and the rust-proof steel material and the concrete are adhered to each other via the adhesive.

  ADVANTAGE OF THE INVENTION According to this invention, the technique which suppresses corrosion of a rustproof steel material can be provided, improving the adhesiveness between a rustproof steel material and concrete.

Explanatory drawing of a bridge provided with a steel-concrete composite floor slab to which the method for adhering rust-proof steel and concrete according to this embodiment is applied Explanatory drawing which shows the rust prevention steel plate which is an example of the rust prevention steel material Explanatory drawing which shows the state in which the adhesive bond layer was formed on the rust prevention layer of a rust prevention steel plate Explanatory drawing which shows the state in which the concrete layer was formed on the adhesive bond layer Explanatory drawing showing a test sample for measuring adhesion

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 4. FIG. 1 is an explanatory diagram of a bridge 100 including a steel / concrete composite floor slab 10 to which a method for closely attaching a rust-proof steel material and concrete according to the present embodiment is applied. Here, first, the structure of the bridge 100 including the composite floor slab 10 will be described.

[Bridge with composite floor slab applied]
The bridge 100 is configured by the composite floor slab 10 being supported by the girder 11. The girder 11 is arranged in a form of a pair of main girders 12 (only one main girder 12 is shown in FIG. 1) arranged in parallel with each other and passed between them. And a horizontal beam (not shown). The main girder 12 and the horizontal girder are each formed from a steel material whose cross-sectional shape is I-shaped. An upper flange portion 12 a is disposed at the upper portion of the main girder 12, and a lower flange portion 12 b is disposed at the lower portion of the main girder 12. A number of stud dowels 13 are erected on the upper surface of the upper flange portion 12a.

  The composite floor slab 10 mainly includes a rust-proof steel plate (an example of a rust-proof steel material) 14, a concrete layer 15, and an adhesive layer 16 sandwiched between the rust-proof steel plate 14 and the concrete layer 15. In addition, the composite floor slab 10 is provided with a large number of stud dowels 17 standing on the top surface of the rust-proof steel plate 14, reinforcing bars (not shown), and the like.

  The rust-proof steel plate 14 is mainly disposed along the bottom surface and side surface of the bridge 100. The bottom steel plate 14a disposed on the bottom surface of the bridge 100 of the rust-proof steel plate 14 is divided into a plurality of portions, and the edge portions of the bottom steel plates 14a face each other with the upper flange portion 12a interposed therebetween. In addition, the edge part of each bottom steel plate 14 distribute | arranged to the upper flange part 12a side becomes the haunch part 14a1 of the shape along the haunch of the bridge 100. FIG. The haunch portion 14a1 is inclined with respect to the horizontal direction. However, the outermost edge portion of the haunch portion 14a1 is a horizontal placement portion 14a2 having a predetermined width, and is a portion placed on the upper surface of the side edge portion of the upper flange portion 12a via the sealing material 18. .

  The concrete layer 15 is formed on the surface of the rust-proof steel plate 14 so that the stud gibber 17 is buried. In addition, the concrete layer 15 is also formed on the upper surface of the upper flange portion 12a so that the stud dowel 13 is buried. The rust-proof steel plate 14 is used as a mold when the concrete layer 15 is placed. An asphalt layer 19 is laminated on the upper surface of the concrete layer 15.

  In each part of such a bridge 100, an adhesion method (hereinafter referred to as an adhesion method) between the rust-proof steel material and the concrete according to the present embodiment is applied. For example, the adhesion method of this embodiment is used for adhesion between the rust-proof steel plate 14 and the concrete layer 15 constituting the composite floor slab 10. In particular, the close contact method of the present embodiment is suitably used for close contact between the haunch portion 14a1 and the concrete layer 15. Moisture such as rainwater tends to accumulate between the hunch 14a1 of the bridge 100 and the concrete layer 15, and it is preferable to apply the contact method of this embodiment to such a place. The haunch part 14a1 is easily affected by the shrinkage of the concrete layer 15 and the close contact method of the present embodiment is preferably applied so that no gap is formed at the interface between the haunch part 14a1 and the concrete layer 15. .

  In the present specification, the “haunch portion” means a portion made of an obliquely thickened portion provided in a structure such as a bridge so as to improve the stress flow at the corner portion and prevent stress concentration. That is. For example, in the case of a bridge, if a `` haunch part '' is provided at the connecting part between the floor slab and the slab, cracks due to the tensile force generated on the bottom surface of the slab near the girder by the floor slab action are reduced, and local stress due to slippage is reduced Can be diffused.

[Adhesion between rust-proof steel and concrete]
Here, an adhesion method between the rust-proof steel material and the concrete will be described with reference to FIGS. 2 to 4. The contact | adherence method of this embodiment makes an adhesive containing acrylic resin emulsion and cement interpose between rust-proof steel materials and concrete, and makes rust-proof steel materials and concrete contact | adhere mutually. The contact | adherence method of this embodiment is provided with the adhesive agent provision process and the concrete provision process, and has the adhesive force holding | maintenance period of a maximum of about 60 days between both processes.

(Adhesive application process)
In the adhesive application process, a rust-proof steel material having a rust-proof layer formed on the surface of the steel material is applied in layers so that an adhesive containing an acrylic resin emulsion and cement overlaps with the rust-proof layer. This is a process for obtaining a rust-proof steel with an agent.

  A rust-proof steel material consists of a rust-proof layer formed on the surface of a steel material. As the steel material, for example, a so-called steel material mainly composed of iron is used. In addition, as the steel material, other metal such as aluminum or an alloy such as stainless steel (for example, stainless steel or high-tensile steel) may be used. Moreover, as the steel material, a steel material used for a steel plate for pressing or the like may be used. The shape of the steel material is not particularly limited, and is appropriately selected from known ones. Examples of the steel material include H-shaped steel material, square steel material, round steel material, L-shaped steel material, wire steel material, plate steel material (steel plate), and the like.

  A rust prevention layer is a layer aiming at rust prevention and corrosion prevention, and consists of a layer mainly composed of zinc formed on the surface of a steel material or a layer mainly composed of an epoxy resin. The range in which the rust preventive layer is formed is not particularly limited, and is appropriately set as necessary. That is, a rust prevention layer may be formed in the whole surface of steel materials, and may be formed in a part of surface of steel materials. The method for forming the rust preventive layer on the surface of the steel material is not particularly limited and is appropriately selected from known ones. For example, the rust preventive layer may be formed on the surface of the steel material by a plating process such as galvanization or hot dip galvanization, or a zinc rust preventive paint mainly composed of zinc such as zinc rich primer and zinc rich paint. It may be formed on the surface of the steel material by painting.

  As the zinc anticorrosive paint, an inorganic component such as an alkyl silicate may be used as a binder, or an organic component such as an epoxy resin, a polystyrene resin or rubber may be used as a binder. In addition, before applying the zinc anticorrosive paint on the surface of the steel material by coating or the like, the surface of the steel material may be previously subjected to surface treatment by shot blasting, keren, sanding or the like.

  As the epoxy resin, a general one for rust prevention and corrosion prevention (for example, a two-component curable epoxy resin) is used. In the case of a rust preventive layer made of an epoxy resin, it is necessary to form concrete on the rust preventive layer after the rust preventive layer is formed and before the epoxy resin is completely cured.

  The thickness of the rust-preventing layer is not particularly limited and is appropriately set according to the purpose. For example, the thickness is set to 30 μm to 500 μm, preferably 70 μm to 250 μm.

  Although it does not specifically limit as a use of a rust prevention steel material, For example, what is used for the place where the improvement of adhesiveness with concrete is calculated | required like the formwork steel plate of a synthetic floor slab as mentioned above is preferable.

  FIG. 2 is an explanatory view showing a rust-proof steel plate 1 which is an example of a rust-proof steel material. The rust-proof steel plate 1 includes a steel plate 2 and a rust-proof layer 3 formed on the upper surface of the steel plate 2.

  The adhesive is composed of a solution-like composition containing an acrylic resin emulsion and cement as main components, and can be prepared, for example, as an aqueous paint.

  Acrylic resin emulsion is a synthetic resin component comprising an acrylic monomer polymer (for example, an acrylic polymer homopolymer, an acrylic polymer copolymer, etc.), or an acrylic monomer and another polymerizable monomer. It contains an acrylic resin made of a copolymer. Examples of acrylic monomers include known ones such as acrylic acid esters, methacrylic acid esters, acrylic acid, and methacrylic acid. The arrangement of the monomers in the polymer is not particularly limited and may be any of a graft shape, a block shape, and a random shape. Examples of the acrylic resin include an acrylic resin, an acrylic silicone resin, and an acrylic styrene resin. The content (% by mass) of the acrylic monomer with respect to all the monomer components (100% by mass) constituting the acrylic resin is preferably 50 to 100% by mass, and more preferably 80 to 97% by mass.

  The acrylic resin emulsion may contain other synthetic resin components in addition to the acrylic resin as a synthetic resin component. Examples of other synthetic resin components include polyester resins, fluororesins, epoxy resins, polyurethane resins, polyether resins, vinyl acetate resins, and silicone resins. These may be used alone or in combination of two or more in combination with an acrylic resin. The content of the acrylic resin contained in the synthetic resin component is preferably 85% by mass to 100% by mass, and more preferably 90% by mass to 100% by mass.

  The glass transition point (Tg) of the synthetic resin component used for the acrylic resin emulsion is preferably −35 to −5 ° C., more preferably −30 to −10 ° C. When the glass transition point is in such a range, the adhesive contained in the acrylic resin emulsion has flexibility, and thus cracking and peeling can be prevented.

  The acrylic resin emulsion contains water in addition to the synthetic resin component. Water is preferably blended at a ratio of 5 to 20 parts by mass, more preferably 5 to 10 parts by mass with respect to 100 parts by mass of the nonvolatile content of the acrylic resin emulsion.

  Cement is added in a proportion of 50 to 190 parts by mass, preferably 75 to 120 parts by mass, with respect to 100 parts by mass of the nonvolatile content of the acrylic resin emulsion. When the added amount of cement is within such a range, the adhesive can improve the adhesion between the rust-proof steel and the concrete. Examples of the cement used for the adhesive of the present embodiment include pneumatic cements such as dolomite plaster, gypsum, and slaked lime, and hydraulic cements such as Portland cement, white cement, and blast furnace cement. In addition, when an air-hardening cement is selected as the cement, the adhesive can be prepared as a so-called one-material type. Moreover, when a hydraulic cement is selected as the cement, the adhesive is prepared as a so-called two-material type. These may be used alone or in combination of two or more.

  The adhesive may contain additives that are used in ordinary paints as long as the object of the present invention is not impaired. Examples of additives include thickeners, dispersants, antifoaming agents, film-forming aids, wetting agents, antifreezing agents, pigments, dyes, crosslinking agents, metal films, UV absorbers, antioxidants, and leveling agents. , Silane coupling agents, surfactants and the like. These may be used alone or in combination of two or more.

  As said thickener, the well-known thing used for mixing cement, mortar, etc., such as methylcellulose, carboxymethylcellulose, hydroxyethylcellulose, polyvinyl alcohol, sodium polyacrylate, is preferable, for example. The thickener is preferably blended at a ratio of 0.05 to 0.2 parts by mass, more preferably 0.05 to 0.1 parts by mass with respect to 100 parts by mass of the nonvolatile content of the acrylic resin emulsion.

  Examples of the antifreezing agent include alkylene glycols such as ethylene glycol and propylene glycol. The antifreezing agent is preferably blended in an amount of 5 to 20 parts by mass, more preferably 5 to 10 parts by mass with respect to 100 parts by mass of the nonvolatile content of the acrylic resin emulsion.

  The above-mentioned adhesive is applied in layers so as to overlap with the rust-proof layer of the rust-proof steel material. As a method for applying the adhesive onto the rust preventive layer, for example, a general coating method can be applied. For example, as a line coating in a factory, a coating method using a spray, a roll coater, a flow coater or the like can be mentioned. Moreover, as on-site coating, the coating method using a brush, spray, a roller, etc. is mentioned.

  Drying of the adhesive may be natural drying or forced drying that shortens the drying time with an electric heater or heater.

  The thickness (thickness after drying) of the adhesive layer formed on the rust preventive layer is not particularly limited, but is preferably 50 μm to 3000 μm, more preferably 100 μm to 1000 μm, and particularly preferably 150 μm to 300 μm. is there. When the thickness of the adhesive layer is within such a range, adhesion between the rust-proof steel and the concrete layer can be ensured, and as a result, corrosion of the rust-proof steel can be suppressed. In addition, an adhesive bond layer is formed in the interface of a rust preventive layer and concrete.

  FIG. 3 is an explanatory view showing a state in which the adhesive layer 4 is formed on the rust prevention layer 3 of the rust prevention steel plate 2. In addition, what formed the adhesive bond layer 4 on the rust prevention layer 3 of the rust prevention steel plate 2 is especially called the rust prevention steel plate 5 with an adhesive agent. In addition, the rust-proof steel plate 5 with an adhesive is an example of a rust-proof steel with an adhesive made of an rust-proof steel material in which an adhesive layer is formed on a rust-proof layer.

(Concrete application process)
In the concrete application process, the concrete is applied to the rust-proof steel sheet with adhesive (an example of the rust-proof steel with adhesive) so that the concrete overlaps with the adhesive (adhesive layer). Is a step of closely contacting each other via an adhesive (adhesive layer).

  As concrete, publicly known concrete, such as ordinary concrete, AE (Air Entrained) concrete, blast furnace cement concrete, high strength cement concrete, etc., can be used, for example. Further, as concrete, those similar to concrete such as mortar and cement can be used. The concrete is placed so as to overlap the adhesive layer 4 while using a predetermined form or a form made of the rust-proof steel plate 5. The concrete after placing is cured through curing for a predetermined period.

  FIG. 4 is an explanatory view showing a state in which concrete 6 is formed on the adhesive layer 4. When the concrete 6 is applied in contact with the adhesive layer 4 of the rust-proof steel plate 5 with adhesive and the concrete 6 is cured, the rust-proof steel plate 5 and the concrete 6 are mutually connected via the adhesive layer 4. Adhered structure 7 is obtained.

  In addition, the contact | adherence method of rust-proof steel materials and concrete of this embodiment is not restricted to civil engineering structures, such as a bridge mentioned above, It can apply with respect to structures of various technical fields.

The adhesive strength (adhesive strength) between the rust-proof steel and the concrete by the adhesive is, for example, a standard adhesive strength test (adhesive strength test) using a Kenken-type tensile tester based on JIS A 6909 7.9 described later. ). For example, if the standard adhesion between the rust-proof steel and concrete is 1.0 N / mm ² or more, it can be said that the rust-proof steel and concrete are in close contact with each other by an adhesive. In addition, when concrete is mortar, if the standard adhesion force between the rust-proof steel and the mortar is 0.5 N / mm ² or more, the rust-proof steel and the mortar are in close contact with each other by an adhesive. It can be said.

  Hereinafter, the present invention will be described in more detail based on examples. In addition, this invention is not limited at all by these Examples.

(Preparation of adhesive)
Example 1
As an acrylic resin emulsion used for the adhesive, an acrylic silicone copolymer resin emulsion III (nonvolatile content: 56 mass%, glass transition point: −20 ° C., average particle size: 300 nm) was prepared. Further, dolomite plaster was prepared as a cement used for the adhesive. In addition to these, water (purified water), an antifreezing agent, a surfactant, an antifoaming agent, and a thickener were prepared as components to be added to the adhesive. These components were blended at a blending ratio shown in Table 1 to produce an adhesive.

  In addition, ethylene glycol was used as an antifreezing agent (antifreezing agent). As the surfactant, a mixture of a nonionic surfactant and an anionic surfactant was used. As the antifoaming agent, a nonionic surfactant was used, and as the thickening agent, a cellulose-based thickening agent (methylcellulose) was used.

(Comparative Example 1)
Adhesion was carried out in the same manner as in Example 1, except that acrylic silicone copolymer resin emulsion I (nonvolatile content: 56 mass%, glass transition point: 0 ° C., average particle size: 300 nm) was used as the acrylic resin emulsion. An agent was prepared.

(Example 2)
As acrylic resin emulsion, acrylic silicone copolymer resin emulsion II (nonvolatile content: 56 mass%, glass transition point: −10 ° C., average particle size: 300 nm) was used in the same manner as in Example 1, An adhesive was prepared.

(Example 3)
As acrylic resin emulsion, acrylic silicone copolymer resin emulsion IV (nonvolatile content: 56 mass%, glass transition point: −30 ° C., average particle size: 300 nm) was used in the same manner as in Example 1, An adhesive was prepared.

(Comparative Example 2)
As acrylic resin emulsion, acrylic silicone copolymer resin emulsion V (nonvolatile content: 56 mass%, glass transition point: −40 ° C., average particle size: 300 nm) was used in the same manner as in Example 1, An adhesive was prepared.

Example 4
As acrylic resin emulsion, acrylic silicone copolymer resin emulsion VI (nonvolatile content: 56% by mass, glass transition point: −20 ° C., average particle size: 500 nm) was used in the same manner as in Example 1, An adhesive was prepared.

(Example 5)
As the acrylic resin emulsion, an acrylic silicone copolymer resin emulsion VII (nonvolatile content: 56 mass%, glass transition point: −20 ° C., average particle size: 400 nm) was used in the same manner as in Example 1, An adhesive was prepared.

(Example 6)
As the acrylic resin emulsion, an acrylic silicone copolymer resin emulsion VIII (nonvolatile content: 56% by mass, glass transition point: −20 ° C., average particle size: 200 nm) was used in the same manner as in Example 1, An adhesive was prepared.

(Example 7)
As the acrylic resin emulsion, an acrylic silicone copolymer resin emulsion VIII (nonvolatile content: 56 mass%, glass transition point: −20 ° C., average particle size: 100 nm) was used in the same manner as in Example 1, An adhesive was prepared.

(Example 8)
An adhesive was prepared in the same manner as in Example 1 except that Portland cement was used as the cement.

Example 9
An adhesive was prepared in the same manner as in Example 1 except that white Portland cement was used as the cement.

(Example 10)
An adhesive was prepared in the same manner as in Example 1 except that gypsum was used as the cement.

(Examples 11 and 12 and Comparative Examples 3 to 6)
Adhesives were prepared in the same manner as in Example 1 except that the amount of cement (dolomite plaster) was changed to the amount shown in Table 2, respectively.

(Examples 13 to 18)
Each adhesive was produced in the same manner as in Example 1 except that the amount of water was changed to the amount shown in Table 2.

[Evaluation]
(Standard adhesion test)
In accordance with JIS A 6909 7.9, a standard adhesion test (adhesion strength test) using the adhesive in each Example and each Comparative Example was performed using a Kenken tensile tester. Moreover, the test sample for the adhesion strength test using the adhesive agent in each Example and each comparative example was produced as follows.

  FIG. 5 is an explanatory diagram showing a test sample for measuring the adhesive force. As shown in FIG. 5, a rust-proof steel plate 30 having a rust-proof layer (thickness: about 100 μm) 32 formed on the surface of the steel plate 31 by hot dip galvanizing is prepared, and the rust-proof layer of the rust-proof steel plate 30 is prepared. The adhesive obtained in each Example and each Comparative Example was applied onto 32 and cured for 7 days to form an adhesive layer 33. The thickness of the adhesive layer 33 (the thickness after curing) was about 250 μm. Next, a layer (mortar layer) 34 made of mortar was formed using a predetermined mold (not shown) so as to be laminated on the adhesive layer 33. The mortar layer 34 was cured for 6 days. The thickness of the mortar layer 34 was about 10 mm. Thereafter, an attachment 36 for a tensile tester was attached to the mortar layer 34 via a predetermined adhesive (epoxy adhesive) 35.

The results of the standard adhesion test are shown in Tables 1 and 2. The evaluation criteria for the standard adhesion test are as follows.
When the adhesive force is 0.5 N / mm ² or more: “○”
When the adhesive force is less than 0.5 N / mm ² "X"

(Adhesion test after heating / cooling cycle)
In accordance with JIS A 6909 7.10, 7.9, using a Kenken-type tensile tester, an adhesive force test after repeated hot / cold using the adhesive in each example and each comparative example (hot / cold repeat) Adhesion strength test) was performed. A test sample similar to that in the standard adhesion test described above was prepared. The results of the adhesion test after repeated heating and cooling are shown in Tables 1 and 2. The evaluation criteria for the adhesion test after repeated heating and cooling are as follows.
When the adhesive force is 0.5 N / mm ² or more: “○”
When the adhesive force is less than 0.5 N / mm ² "X"

(Storage stability (with or without curing))
The adhesive obtained in each Example and each Comparative Example was placed in a plastic sealed container and allowed to stand at a temperature of 50 ° C. to confirm whether the adhesive was cured. The presence / absence of curing was confirmed by tilting the container and visually confirming the fluidity of the adhesive. The results are shown in Tables 1 and 2. The evaluation criteria for storage stabilization (presence or absence of curing) are as follows.
When there is no cure after 24 hours
When curing has occurred after 6 hours ...... "△"
When curing has occurred after 2 hours.

(Storage stability (presence or absence of sedimentation))
As an evaluation of storage stability, the presence or absence of sedimentation was confirmed along with the presence or absence of the above-described curing. The results are shown in Tables 1 and 2. The evaluation criteria for storage stabilization (presence / absence of sedimentation) are as follows.
If there is no settling after 24 hours.
If sedimentation occurs after 3 hours ...... "△"
When sedimentation has occurred after 1 hour ...... "X"

(Applicability (film formability))
The applicability | paintability with respect to the antirust steel plate of the adhesive agent in each Example and each comparative example was evaluated. The results are shown in Tables 1 and 2. In addition, the evaluation criteria of applicability (film forming property) are as follows.
When it is easy to apply and can form a coating with little thickness unevenness.
When it is difficult to spread the adhesive by coating, but a coating film can be formed.
When it cannot be applied and a coating film cannot be formed.

(Example 19)
The same adhesive as in Example 1 was prepared, and the above-mentioned standard adhesive force test and adhesive force test after the heating / cooling cycle were performed using the adhesive. In Example 19, in the standard adhesion test and the adhesion test after the heating and cooling cycle, a zinc rich primer (inorganic zinc rich primer, manufactured by Kansai Paint Co., Ltd., trade name “SD Zinc 1000”) was applied to the surface of the steel sheet. ) To form a rust-proof layer (thickness: about 15 μm (dry film thickness)) was used as a test sample. The results are shown in Table 3. The evaluation criteria for the standard adhesion test and the adhesion test after the heating / cooling cycle are the same as those described above.

(Example 20)
Zinc rich paint (inorganic zinc rich paint, manufactured by Kansai Paint Co., Ltd., trade name “SD Zinc 1500”) was applied as a rust-proof steel sheet to form a rust-proof layer (thickness: about 75 μm (dry film thickness)). A standard adhesion test and an adhesion test after the heating / cooling cycle were performed in the same manner as in Example 19 except that the rust steel plate was used as a test sample. The results are shown in Table 3.

(Example 21)
As a rust-proof steel sheet, a rust-proof steel sheet having a rust-proof layer (thickness: about 15 μm (dry film thickness)) applied with a two-component reaction-curable epoxy resin (trade name “Epool”, Dainippon Paint Co., Ltd.) A standard adhesion test and an adhesion test after the heating / cooling cycle were performed in the same manner as in Example 19 except that the test sample was used. The results are shown in Table 3.

(Comparative Example 7)
A mortar layer is formed directly on the rust-preventing layer (hot-dip galvanized) of a rust-proof steel plate (hot-dip galvanized steel plate) without forming an adhesive layer, and a test sample is prepared. The standard adhesion test and the adhesion test after the heating / cooling cycle were performed. The results are shown in Table 3.

(Comparative Example 8)
A standard adhesion test and an adhesion test after a heating / cooling cycle were performed in the same manner as in Comparative Example 7 except that a rust-proof steel plate having a rust-proof layer made of the same zinc rich primer as in Example 19 was used. . The results are shown in Table 3.

(Comparative Example 9)
A standard adhesion test and an adhesion test after a heating / cooling cycle were performed in the same manner as in Comparative Example 7 except that a rust-proof steel plate having a rust-proof layer made of the same zinc rich paint as in Example 20 was used. . The results are shown in Table 3.

(Comparative Example 10)
Adhesive strength after standard adhesion test and heating / cooling cycle in the same manner as in Comparative Example 7, except that a rust-proof steel plate provided with a rust-proof layer made of the same two-component reaction-curable epoxy resin as in Example 21 was used. A test was conducted. The results are shown in Table 3.

(Example 22)
A standard adhesion test (adhesion strength test) using a Kenken-type tensile tester according to JIS A 6909 7.9 in the same manner as in Example 1 except that a concrete layer is formed instead of the mortar layer. Went. Incidentally, it referred strength of the concrete is 30 N / mm ^2, standard adhesion was 2.65N / mm ^2.

  DESCRIPTION OF SYMBOLS 1 ... Rust prevention steel plate, 2 ... Steel plate, 3 ... Rust prevention layer, 4 ... Adhesive layer, 5 ... Rust prevention steel plate with adhesive, 6 ... Concrete, 7 ... Structure, 10 ... Synthetic floor slab, 11 ... Girder 12: Main girder, 12a ... Upper flange portion, 12b ... Lower flange portion, 13 ... Stud gibber, 14 ... Rust-proof steel plate, 14a ... Bottom steel plate, 14a1 ... Hunch portion, 14a2 ... Placement portion, 15 ... Concrete layer , 16 ... Adhesive layer, 17 ... Stud gibber, 18 ... Sealing material, 30 ... Anti-rust steel plate, 31 ... Steel plate, 32 ... Anti-rust layer, 33 ... Adhesive layer, 34 ... Mortar layer, 35 ... Epoxy adhesive 36 ... Attachment, 100 ... Bridge

Claims (4)

An adhesive that is interposed between rust-proof steel and concrete, and improves the adhesion between the rust-proof steel and concrete,
An acrylic resin emulsion containing an acrylic resin as a synthetic resin component;
Cement, and
The glass transition point (° C.) of the synthetic resin component is −35 to −5 ° C.,
The adhesive, wherein the cement is blended at a ratio of 50 to 190 parts by mass with respect to 100 parts by mass of the nonvolatile content of the acrylic resin emulsion. Concrete is placed on a formwork made of a rust-proof steel plate, on which a rust-proof layer made of a hot-dip galvanized or zinc-containing coating or epoxy resin coating is formed on the surface of the steel plate. A method for producing a synthetic floor slab for producing a synthetic floor slab, comprising:
For the rust-proof steel plate constituting the mold, a step in which an adhesive containing an acrylic resin emulsion and cement is applied in layers so as to overlap the rust-proof layer;
And a step of placing the concrete so as to overlap the adhesive on the formwork provided with the adhesive.   The method of manufacturing a composite slab according to claim 2, wherein the mold forms a haunch part in a structure such as a bridge, and the adhesive is applied to at least the haunch part of the mold. An adhesive containing an acrylic resin emulsion and cement is applied to a rust-proof steel material in which a rust-proof layer made of hot-dip galvanized or zinc-containing paint film or epoxy resin film is formed on the surface of the steel material. An adhesive application step in which an anticorrosive steel material with an adhesive is obtained by being layered so as to overlap the antirust layer,
To the rust-proof steel with adhesive, concrete is applied so as to overlap the adhesive, and the concrete-adding step in which the rust-proof steel and the concrete are in close contact with each other via the adhesive, The adhesion method of rust-proof steel materials and concrete provided with.

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