JP4906299B2 - Polyolefin-based resin mesh and concrete structure repair or reinforcement using the mesh - Google Patents

Description

  The present invention relates to a polyolefin resin mesh-like material suitable for prevention of concrete piece peeling from structures such as concrete tunnels, elevated roadways, bridges, buildings, etc., and repair of peeled parts, and a concrete structure using the same. It relates to the repair or reinforcement method of objects.

In recent years, reinforced concrete structures at or near the coast are damaged by sea salt particles, and the structures deteriorate due to corrosion and expansion of the reinforcing bars caused by salt intrusion into reinforced concrete structures in contact with seawater. Or deterioration of concrete due to weakening of the surface layer due to substances that are harmful to concrete, such as acid rain and chemicals in factories, or excessive traffic to structures due to increased vehicle traffic, increased loading capacity, speeding up, etc. It is a big problem that the surface part of the concrete structure is peeled off due to load or the concrete structure itself is deteriorated.
Various methods have been studied, such as a method for preventing the deteriorated concrete from peeling off, various methods for repairing the peeled portion, and materials thereof. Among them, in a repair or reinforcement sheet in which a laminate having a protective layer as a surface layer and an adhesive layer to a concrete structure is provided in advance, and a reinforcing layer made of a fiber base material is interposed between these layers, the fiber A material using a sheet-like material obtained by processing organic fibers, inorganic fibers, or the like as a non-woven fabric or a woven fabric as a base material has been proposed as being able to facilitate the construction and stabilize the quality. (See Patent Document 1)
Conventionally, various fiber base materials for repair or reinforcement have been proposed. However, from the viewpoint of adhesion to concrete and the like, sheet materials made of vinylon fibers are mainly used at present. ing.
As a fiber sheet for preventing flaking of vinylon fibers, it has been proposed that the strength, elongation, Young's modulus, strength of the fiber sheet, and the like of the vinylon fibers are within a predetermined range. (See Patent Document 2)
On the other hand, in the fiber sheet for preventing peeling by the vinylon fiber, at a low temperature of about −30 ° C., there is a concern that the reinforcing effect is reduced due to the embrittlement of the fiber and the concrete is peeled off.
However, Patent Document 1 and Patent Document 2 do not describe problems and countermeasures under a low temperature of about −30 ° C.

Moreover, the sheet for preventing peeling or repair needs to exhibit a sufficient reinforcing effect when the concrete structure fluctuates, and needs to have appropriate strength and elongation.
Even if fibers made of polyolefin resin are selected in consideration of low temperature embrittlement, how should the surface treatment of the fiber sheet (mesh-like material) be performed in relation to the adhesive used for construction and the topcoat resin? For example, whether it has an effective reinforcing effect has not yet been examined.
In addition, as a sheet for reinforcement and repair, a reinforcement sheet that is easy to follow depending on the point of reinforcement and repair of the target concrete structure is desired from the viewpoint of handling and workability. However, a sheet satisfying these requirements has not yet been obtained. Not.

JP 2002-256707 A JP 2004-238757 A

  The present invention was made in order to solve the above-mentioned problems of the prior art, and its purpose is to provide a concrete reinforcement / excellence that is excellent in handleability and workability and has a sufficient effect of preventing concrete from peeling off even in a low temperature environment. An object of the present invention is to provide a polyolefin resin mesh for repair and a repair or reinforcement method for a concrete structure using the mesh.

  As a result of diligent research to achieve the above object, the present inventors have found that the polyolefin resin mesh-like material has an effect of preventing the concrete from peeling off even in a low-temperature environment, and only modifies one side of the mesh-like material. It has been found that the above problems can be solved by improving the wettability and heating / pressurizing the mesh-like material.

That is, the present invention
(1) A repair or reinforcement mesh-like material of the concrete structure, the surface which the mesh-like material is made of a polyolefin resin, and has been modified into one wetting or more index 34 mN / m, the other unmodified A polyolefin resin mesh-like material, wherein the non-modified surface is laid as a repaired or reinforced concrete structure side ,
(2) The polyolefin resin mesh-like product according to (1), wherein an identification mark is provided on either the modified surface or the non-modified surface,
(3) The polyolefin resin mesh-like product according to (2), wherein the identification mark is a colored thread or a colored narrow tape,
(4) According to (2) or (3), the identification mark also serves as a mark of an overlapped portion of the mesh-like object in a reinforcement or repair work that is performed at a predetermined interval from the widthwise end of the mesh-like object. The polyolefin resin mesh-like material as described,
(5) The polyolefin according to any one of (1) to (4), wherein the polyolefin resin mesh-like product is one or more of woven fabric, net, knitted fabric, nonwoven fabric, and laminated fabric. Resin-based mesh,
(6) The woven fabric, net, or laminated fabric is (a) a core component made of a polyolefin resin, and (b) a sheath component made of a polyolefin resin having a melting point that is 20 ° C. lower than the melting point of the core component. A polyolefin resin mesh-like product according to (5), comprising a sea-island type composite yarn obtained by fusing a sheath component of a sheath-core type composite fiber comprising:
(7) The laminated fabric is obtained by laminating the sea-island type composite yarn in at least three directions of warp direction, oblique direction, and reverse oblique direction, and heat-sealing the laminated sea-island type composite yarns. The polyolefin resin mesh-like product according to the above (6), which is a two-layer triaxial laminated fabric,
(8) The polyolefin system according to (7), wherein the sea-island type composite yarn is arranged on the warp at a predetermined interval from both ends to form an identification mark in any one of the warp and warp two layers. Resin mesh,
(9) The polyolefin resin mesh material according to any one of (6) to (8), wherein the polyolefin resin mesh material is further heated and pressurized.
(10) Repair or reinforcement of a concrete structure in which the non-modified surface of the polyolefin resin mesh-like material according to any one of (1) to (9) is lined as the repaired / reinforced concrete structure side While using the method and the polyolefin resin mesh-like material described in (11), (4) or (8), the non-modified surface of the mesh-like material is to be repaired or reinforced concrete structure side, The present invention provides a concrete structure repairing or reinforcing method, characterized in that the mesh-like object is sequentially overlapped in the width direction and covered with the overlapping portion identification mark as a reference.

Since the polyolefin resin mesh for repairing or reinforcing a concrete structure of the present invention is composed of a polyolefin resin, it prevents the concrete from peeling off even in a low temperature environment of about -30 ° C without embrittlement. The effect of can be expressed.
In addition, the wettability on the top-coated resin side of the mesh-like material is modified, and the non-modified side is placed on the repaired or reinforced concrete structure side to cover the concrete structure side, thereby allowing for the load from the concrete structure side. The displacement is increased, and the reinforcing effect for preventing the concrete from peeling off can be expressed more effectively.
By using a polyolefin resin mesh with an identification mark on either the modified surface or the non-modified surface, and using this to cover according to the construction specifications, the modified surface is surely in the specified direction. Thus, reinforcement or repair work that satisfies the design specifications can be performed.
In addition, when the mesh-like material is heated and pressurized, the flexibility of the mesh-like material increases, improving handling, workability, and the ability to repair or reinforce the concrete structure during construction. This makes it possible to create a lining that looks good.
When a mesh-like object is used that serves as a mark for the overlapping part of the mesh-like object in reinforcement or repair work, and the identification mark is applied at a predetermined interval from the widthwise end of the mesh-like object, the overlaying work becomes easy and Matching dimensions can be kept constant, ensuring reinforcement strength, a beautiful finish, and a constant mesh material cost.
The concrete structure repair or reinforcement method of the present invention is a concrete peeling prevention reinforcement / reinforcement method that is effective even in a low temperature environment using the polyolefin resin mesh-like material, and the mesh structure has an appropriate surface. Because it has a shape-like rigidity, it can be handled as a single unit at the time of construction and has excellent fit to repaired and reinforced concrete structures, so it can hold fiber sheets after construction like other fiber sheets. Since it is not necessary to use a base material sheet such as a film (see Japanese Patent Application Laid-Open No. 2001-73560) or to remove it after the construction, the cost can be reduced and the construction can be simplified.

The polyolefin resin mesh for repairing or reinforcing a concrete structure according to the present invention is made of a polyolefin resin, and only one surface is modified to have a wetting index of 34 mN / m or more.
Examples of the polyolefin resin that can be used in the mesh-like product of the present invention include binary copolymers of olefins such as polyethylene, polypropylene, ethylene, propylene, and butene-1, or ternary copolymers. In the present invention, the mesh-like material has a reinforcing effect such as a woven fabric, a net, a knitted fabric, a non-woven fabric and a laminated fabric made of fibers or composite yarns having an opening ratio of 30% or more, or a stretched plastic sheet. Can be used.
When the opening ratio is less than 30%, it is difficult for an adhesive, an overcoat resin, an undercoat resin or the like to enter the mesh-like material, and a reinforcing effect cannot be expected.

The surface modification is performed in order to improve the wettability of the adhesive and improve the adhesive strength. Here, when the adhesive strength is improved by modifying both sides, the reinforcing layer behaves as a whole with respect to the load from the concrete structure side, reaches the yield load with a relatively small displacement, and accordingly mesh-like material Is easy to destroy. However, if only one side is modified, the adhesion between the concrete structure and the mesh-like object is relatively weak, and this part is first peeled off, and then the load is propagated to the reinforcing layer side, so that the displacement can be increased. In the invention, only one side is modified.
The surface modification is at least a wetting index of 34 mN / m or more. If the wetting index is 34 mN / m or more, sufficient adhesive strength can be obtained.
More preferably, if it is 56 mN / m or more and the wetness index of 34 mN / m or more can be maintained even when stored for about half a year, the usable period of the mesh-like material can be extended, and the storage management can be afforded.
In order to set the wetting index to 34 mN / m or more, it is easy to achieve the surface of the mesh-like material by performing a dry surface treatment such as a corona discharge treatment or a plasma treatment.

It is desirable to provide an identification mark on the modified or non-modified surface. This is because the adhesive property with the reinforcing resin and the fracture behavior as a reinforcing material differ between the modified surface and the non-modified surface, and it is necessary to strictly specify the direction of use of the mesh-like material. This is to easily and reliably identify the surface. It can also be used as a check item for reinforcing materials in completion inspection.
The identification mark is generally applied to the modified surface side. However, since the mesh-like material is a planar material, it is optional to use a surface without the identification mark as the modified surface.
The identification mark may be provided either before or after the surface modification treatment of the mesh-like material,
When providing before processing, use fibers or yarns that make up the mesh-like material, or use continuous colored yarns, colored narrow tapes, etc., regardless of the fibers that make up the mesh-like material. The method of sticking or sewing on one side of a mesh-like thing can be mentioned. Or when a mesh-like thing can be printed, linear coloring printing etc. may be sufficient.
When the identification mark is applied before the surface modification treatment, the surface modification treatment may be performed on the specific surface thereafter.
In addition, even when an identification mark is attached after the surface modification treatment, a continuous colored thread, a colored narrow tape, or the like is attached to a specific surface of the mesh-like material continuously or after the surface treatment process, or printing, etc. Just do it.
In any case, it is necessary that the identification mark has no adverse effect on the mesh of the mesh-like material, or the adhesion strength of the surface of the mesh-like material. From this viewpoint, the material approximate to the mesh-like material, That is, a thin one made of polyolefin resin is desirable.

The identification mark is applied at a predetermined interval from the widthwise end of the mesh-like object, and also serves as a mark for the overlapped part of the mesh-like object in reinforcement or repair work. It is desirable from the viewpoint of confirmation.
When construction is performed by joining in the width direction, the overlapped portion is generally about 10% of the width, and thus is identified by a predetermined dimension such as 10 (5 to 15)% width from the left and right end portions in the width direction. It is desirable to provide a sign.
In this case, the entire width of the overlapping portion may be colored yarn or the like, or only the boundary portion (end portion) of the overlapping portion may be a linear identification mark line made of colored yarn or the like.

The polyolefin resin mesh-like product of the present invention can be selected from one or a combination of two or more of woven fabric, net, knitted fabric, non-woven fabric, and laminated fabric.
The laminated fabric is also called a braided fabric, and a three-axis fabric laminated in at least three directions of warp direction, oblique direction, and reverse oblique direction can be generally used. The laminated fabric can be produced, for example, by the method described in JP-A-11-20059.

The base material constituting the woven fabric, net, or laminated fabric of the mesh-like product of the present invention has (a) a core component made of a polyolefin resin and (b) a melting point that is 20 ° C. lower than the melting point of the core component. It is preferably composed of a sea-island type composite yarn obtained by fusing a sheath component of a sheath-core type composite fiber composed of a sheath component made of a polyolefin resin, and the intersection of the composite yarn is heat-sealed. Suitable combinations of the core component and the sheath component include, for example, a combination using isotactic polypropylene (mp = 163 ° C.) as the core component and linear low density polyethylene (mp = 110 ° C.) as the sheath component.
Such a sea-island type composite yarn is spun to have a predetermined sheath / core cross-section ratio by using, for example, a spin draw method, using a conventional composite spinning equipment and a core-sheath type composite spinning nozzle, and led to a drawing apparatus that is directly connected. It can be obtained by stretching under saturated water vapor pressure and fusing between fibers with a sheath component together with stretching. Moreover, it can manufacture by the method as described in Unexamined-Japanese-Patent No. 2003-326609.
The thermal fusion at the intersection of the composite yarns can be achieved by a method such as roller pressing in which a woven fabric, a net, a laminated fabric or the like is heated to the melting point of the sea component or higher.

  In the mesh-like product of the present invention, the sea-island composite yarn is laminated in at least three directions of warp direction, oblique direction, and reverse oblique direction, and the laminated sea-island composite yarns are heat-sealed to each other or It is desirable to use a biaxial triaxial laminated fabric from the viewpoint of the use efficiency of the composite yarn, the physical properties of the laminated fabric, the economic efficiency, and the like.

In the mesh-like product of the triaxial laminated fabric, it is desirable that the identification mark is colored on the warp from the viewpoints of discrimination, economy, strength retention of the mesh-like product, designability, and the like.
In the case of a triaxial laminated fabric of warp layers, if warp yarns colored at predetermined positions and / or center portions are arranged from the left and right end portions in the width direction of the warp layer, diagonal yarns, Since the directional yarns are stacked, the warp yarns have a linear shape without alternately going up and down with the oblique and reverse oblique yarns. Therefore, the colored warp as the identification mark is identified as a straight line, so that the surface of the mesh-like object can be reliably identified, and even when it serves as the mark of the overlapped portion, it can be clearly identified and the construction efficiency is improved. Can be achieved.
In the case of a warp bilayer triaxial laminated fabric, in any one of the warp layers of the two warp layers, warp colored at a predetermined interval from both ends may be arranged as described above.
When the above-mentioned sea-island type composite yarn is used as the constituent yarn of the triaxial laminated fabric, an original (colored) sea-island type composite yarn may be used as an identification mark.
An original sea-island type composite yarn comprises a sheath core comprising (a) a core component comprising a polyolefin resin and (b) a sheath component comprising a polyolefin resin having a melting point 20 ° C. lower than the melting point of the core component. In a sea-island type composite yarn in which the sheath component of the type composite fiber is fused, the method of melt spinning by adding a predetermined pigment master batch to the core component is easy to make the spinning process stable and dark, and the manufacturing cost is low. This is desirable because it is easy to deal with a variety of products.
In addition, in the case of a warp bilayer triaxial laminated fabric, if the total number of warps is the same as in the case of one layer, and the mutual arrangement of the two layers of warps is alternated as viewed from the top, At the final stage, the thickness of the laminated fabric can be made substantially the same as that of the single layer triaxial laminated fabric. In the case of such warp arrangement, it is possible to obtain a fabric having the same basis weight as that of the warp triaxial laminated fabric, with the upper and lower warp layers grasping the oblique layer and the reverse oblique layer from above and below.

If the polyolefin resin-made mesh-like product is further heated and pressurized to make the entire mesh-like product thin, it becomes soft and the flexibility of the mesh-like product can be increased.
The heating temperature may be in the vicinity of the melting point of the sea component and may be performed by a method such as roller pressing as described above.

In the repair or reinforcement method for a concrete structure according to the present invention, the non-modified surface of the polyolefin resin mesh-like material according to any one of (1) to (9) is used as the repaired or reinforced concrete structure side. The wettability modified side is the top resin side. On the other hand, the adhesion between the reinforcing layer and the concrete structure is too strong, and the allowable displacement with respect to the load becomes small, and there is a possibility that it is not possible to effectively prevent the coating resin from falling off.
Further, in the method of the present invention, since the polyolefin resin mesh-like product is thermoplastic, it is also possible to use the shape of the object to be reinforced or repaired by pre-heating the mesh-like product.
Further, in the construction method of the present invention, a polyolefin resin mesh-like material provided with an identification mark for specifying a modified surface or an unmodified surface, the surface with the identification mark is set in a predetermined direction, and In the case of being used by being continuously overlapped in the width direction, they may be used by sequentially connecting them with reference to the overlapping identification marks, and the arrangement work can be easily performed visually.
For this reason, the efficiency of lining work, standardization, reinforcement, or constant repair strength can be achieved.

Hereinafter, although an example and a comparative example explain the present invention, the present invention is not limited to these examples.
<Manufacture of sea-island type composite yarn>
Isotactic polypropylene (mp = 163 ° C.) is used for the core component, and linear low density polyethylene (mp = 110 ° C.) using a metallocene catalyst is used for the sheath component, and a conventional composite spinning equipment, core-sheath type composite spinning nozzle (240 Hole), spinning at 260 ° C. so that the sheath / core cross-section ratio is 30/70, guiding to a stretching apparatus directly connected, and stretching at a stretching ratio of 13 times under a saturated water vapor pressure of 0.42 MPa and 145 ° C. To obtain a sea-island type composite yarn having a total fineness of 1850 dtex in which fibers are fused with a sheath component along with stretching, and having 240 filaments, using a core polypropylene as an island component and a sheath linear low-density polyethylene as a sea component. . (Spin draw method)
The tensile strength of the sea-island type composite yarn, which is this organic fiber reinforced thermoplastic resin composite, is 6.5 cN / dTex, the elongation is 15%, the Young's modulus is 92.0 cN / dTex, and heat shrinkage measured at 140 ° C. The rate was 5.0%.
<Manufacture of original arrival island type composite yarn>
Other than adding a green masterbatch (GREEN 6938 (E) Z, manufactured by Dainippon Ink & Chemicals, Inc.) so that the pigment concentration is 2%, the above-mentioned sea-island type composite yarn is used. A green sea island type composite yarn was obtained under the same manufacturing conditions.

<Manufacture of mesh-like material>
The obtained sea-island type composite yarn is placed in a laminated fabric manufacturing apparatus, and warp yarn, oblique yarn and reverse oblique yarn are laminated at a pitch of 10 mm in three directions of warp direction, oblique direction and reverse direction, and then the surface temperature The triaxial mesh-like product 1 in which the composite portion of the sea part resin was melted by contact heating with a 150 ° C. heating roller and the composite yarn of each layer was adhered was obtained.
<Manufacture of mesh with identification mark>
In the above triaxial mesh-like material, the turning points in the oblique and reverse oblique yarns of the mesh-like material are usually cut and removed as “ears”. A warp arrangement (warping) in which each green sea island type composite yarn is arranged at a position of 100 mm and one in the center in the width direction is performed at a pitch of 10 mm, and an oblique yarn and a reverse oblique yarn are arranged thereon. Laminate at a pitch of 10 mm, and further arrange the warp layer on the upper surface of this warp triaxial laminated fabric at the same pitch as the lower layer and at the middle position of the lower layer, and have warp layers on the top and bottom, and the identification mark on the lower layer A polyolefin-based resin-made mesh-like product 2 having a basis weight of 65 g / m ² and a width of 1000 mm (effective width after ear treatment) through a bilayer triaxial laminated fabric was obtained.

<Surface modification treatment of mesh-like material>
The continuous mesh-like objects 1 and 2 are passed through a corona discharge treatment device (Kasuga Denki Co., Ltd., model name: oscillator AGI-023, electrode aluminum 6 ridges), and the voltage, treatment speed, etc. are changed, and the mesh-like objects The degree of reforming was adjusted. About the mesh-like thing 2, the surface in which the green sea island type composite yarn was arrange | positioned gave the corona discharge process.
Moreover, the evaluation method of the surface modification degree used the wettability test method by JISK6768 mentioned later.
<Heating / pressurizing treatment of mesh-like material>
In order to soften the mesh-like material, it was pressed at 100 ° C. and 110 ° C. and a pressure of 20 Mpa (200 kg / cm ² ).

About the mesh-like thing 1, each performance as a reinforcing material was measured with the following method.
<Preparation and evaluation of punch test sample>
The performance of the reinforcing layer formed on the surface of the concrete structure was evaluated in accordance with the Japan Highway Public Corporation Standard, JHS424: 2004, “Peeling prevention punching test method”.
An upper lid type U-shaped side groove (lid) nominal name 300 (400 × 600 × 60 mm) (hereinafter referred to as “U-shaped lid”) defined in JIS A5372 was used.
The central part of the U-shaped lid was cored (perforated) with a concrete core cutter in a shape of φ100 mm. The core removal direction was 55 mm ± 0.5 mm from the back surface (opposite surface of the mesh-like object bonding construction surface).
After the U-shaped lid is immersed in water kept at 20 ° C. for 24 hours, the U-shaped lid is taken out of the water, the surface on which the perforations are formed is the bottom surface, and the surface facing this bottom surface is the surface The surface moisture was wiped off with a waste cloth.
Next, a primer was applied to the surface to form an undercoat resin coating film, and then a mesh-like material was placed thereon. Further, an overcoat resin layer was formed to form a reinforcing layer. As the primer, an epoxy resin primer to which a modified polyamine was added was used, and an epoxy resin was used for the undercoat resin coating and the topcoat resin coating.
The amount of primer used was 0.25 kg / m ² . The amount of synthetic resin used to form the undercoat resin coating film was 0.50 kg / m ² . The amount of synthetic resin used to form the topcoat resin layer was 0.50 kg / m ² .
Next, after forming the reinforcing layer, the reinforcing layer was cured at room temperature for 1 week.
Subsequently, the U-shaped lid on which the reinforcing layer was formed was placed on the H steel with a span of 400 mm with the surface on the side where the perforations were formed as the upper surface.
Next, the load cell was loaded on the bottom surface of the perforation via a ball seat or the like so that a load was applied vertically and evenly to the center of the bottom surface of the perforation.
After loading the core at a speed of 5 mm / min and breaking the core, a punching test was conducted at 1 mm / min, and the maximum punching load (maximum load bearing capacity), breaking load and displacement were recorded on the chart. Moreover, the state at the time of maximum point displacement was photographed, and the presence or absence of resin peeling was evaluated.
<Evaluation of surface modification degree>
In accordance with a wettability test method according to JIS K6768, measurement was performed using a wettability standard reagent (manufactured by Wako Pure Chemical Industries, Ltd.).
<Evaluation of flexibility>
It was measured by the bending resistance A method (cantilever method) defined in JIS L 1096-1990.

Examples 1-4, Comparative Examples 1-5, Reference Example 1
The mesh-like product 1 is hot-pressed at 100 ° C. to obtain a mesh-like product having an apparent thickness of 0.20 mm and a bending resistance of 90.0 mm. Only one side of the mesh-like product is subjected to corona discharge treatment. Example 1 in which a mesh-like product having a wetting index of 56 mN / m was obtained, and the punching test sample was adjusted with the processing surface up (the reinforcing layer side at the time of actual reinforcement), the processing surface down (at the time of actual reinforcement) In Comparative Example 1 on the concrete structure side), the treatment level was 39 mN / m, Example 2 with the treatment surface up, and Comparative Example 2 with the treatment surface down, and a resin test was performed by performing a punching test. The presence or absence was observed.
In addition, a hot press condition is set to 110 ° C., and a corona discharge treatment is applied only to one side of a mesh-like material having an apparent thickness of 0.14 mm and a bending resistance of 65.0 mm. 3, 4 and Comparative Examples 3 and 4 were obtained and tested in the same manner.
In addition, as Reference Example 1, a mesh-like product that was processed on both sides without heat pressing treatment to 42 mN / m was prepared by adjusting a test sample at a stage where it became 37 mN / m after two months, surface treatment, press Comparative Example 5 was tested without any treatment.
These results are summarized in Table 1.

From the comparison of Examples 1, 2, 3, and 4, even if the corona treatment level is changed, if the wetting index is 34 mN / m or more, a sufficient punching load and a long displacement are maintained, and the pressing conditions are changed. It can be seen that the same performance is maintained.
Further, from the comparison between these examples and the corresponding comparative examples, when the treatment surface is down, the maximum point displacement and the break point displacement are reduced, and the resin is observed to fall off.

Example 5 and Reference Comparative Example 5
The reinforcement at -30 ° C was compared with a vinylon mesh.
As Example 5, the same polyolefin resin mesh 1 as in Example 1, and as Reference Comparative Example 5, a vinylon mesh (a used fiber 2000 dTex), which is a triaxial laminated fabric with a 10 mm mesh for reinforcing concrete, is used. The primer used was an epoxy resin primer with a modified polyamine added, and an epoxy resin was used for the undercoat resin coating and the topcoat resin coating.
Immediately after removing the sample from the −30 ° C. atmosphere, the same punching test as described above was performed in an environment of 20 ° C. Table 2 summarizes the results of load, maximum load, and displacement at a 10 to 50 mm displacement point in the punching test.

When the results of Example 5 using the polyolefin-based mesh material of the present invention and the results of Reference Comparative Example 5 using the vinylon mesh material are compared, the reference layer of Reference Comparative Example 5 has a displacement of 10 mm or less immediately after storage at −30 ° C. Although it almost broke down and reached the maximum load point with a displacement of only 10.6 mm, the load was 1.21 kN, indicating a very brittle property, whereas in Example 5, the maximum load displacement point was 33.8 mm. It has a proof stress of 2.35 kN even at a maximum load of 2.89 kN and a displacement of 50 mm, and exhibits excellent behavior as a reinforcing layer.
From the above, the polyolefin resin-based mesh material of the present invention is extremely excellent as a reinforcing material for reinforcing or repairing concrete structures.

Example 6
As shown in FIG. 2 with the left and right ends turned upside down, the warp thread 11 having a width of 1000 mm, a position of 100 mm from both ends, and a center position of 500 mm (bottom) is a green original sea-island type composite thread 12, The polyolefin resin-based mesh-like product, in which the oblique yarn 13, the reverse oblique yarn 14, and the (upper) warp yarn 15 are sequentially laminated, and the linear identification mark continuous to the (lower) warp layer is applied, is heated at 100 ° C. Press to obtain a mesh-like material having an apparent thickness of 0.20 mm and a bending resistance of 90.0 mm, and corona discharge treatment is performed only on the side of the green linear identification marker surface. A triaxial mesh-like material 2 of 56 mN / m was prepared.
This was subjected to a test for reinforcing reinforcement of a mesh-like portion adhered to a vertical concrete wall surface for test having a height of 3 m and a length of 6 m and having a height of 2 m and a width of about 4 m, and the workability was evaluated.
It was decided to shift from the right side to the left side, and install the mesh-like object in units of 4 sheets with a width of 3.4 m as one block.
An epoxy primer (Aika Kogyo Co., Ltd .: trade name: Cleat Coat EX Primer) was applied to the concrete wall of the first block at a use amount of 0.3 kg / m ² , and then an epoxy undercoat impregnating resin (Aika Industry) Co., Ltd .: Product name: Jolliseal JBX-119) is applied at a rate of 0.5 kg / m ² , and the surface-treated triaxial mesh-like product is applied with the longitudinal direction up and down and the green identification mark (thread) side facing forward. Subsequently, the right end portion of the second mesh-like object was overlaid on the left-side overlapped part identification mark of the first mesh-like object 2, and the third and fourth mesh-like objects were successively attached thereafter. In this sticking workability test, the time required for sticking the four mesh-like materials after applying the undercoat impregnating resin was shortened by about 30% compared to the case of the mesh-like material having no identification mark, and the workability was improved.
In addition, for mesh-like objects that do not have an identification mark, it was necessary to prepare for marking the surface-treated surface with magic ink, etc., and drawing the overlapped part after cutting to a standard size. The man-hours could be reduced. In addition, there was no shortage of mesh-like objects during construction due to excessive overlaying, and there were no problems such as excess mesh-like objects on the construction surface due to insufficient overlaying.

Since the polyolefin resin mesh for repairing or reinforcing a concrete structure of the present invention is composed of a polyolefin resin, it prevents the concrete from peeling off even in a low temperature environment of about -30 ° C without embrittlement. By improving the wettability of the top coat resin side of the mesh-like material and placing the non-modified side on the repaired or reinforced concrete structure side and lining the concrete structure, Since the permissible displacement with respect to the load from the side is increased and the reinforcing effect of preventing concrete peeling can be exhibited more effectively, it can be used for lining concrete structures.
In addition, if a modified mesh or non-modified surface is provided with an identification mark on a polyolefin resin mesh and laid according to the construction specifications using this, the modified surface can be reliably specified. In this direction, reinforcement or repair work that satisfies the design specifications can be performed.
In addition, when the mesh-like material is heated and pressurized, the flexibility of the mesh-like material increases, improving handling, workability, and the ability to repair or reinforce the concrete structure during construction. This makes it possible to create a lining that looks good.
In addition, if a mesh-like object that also serves as a mark for the overlapping part of the mesh-like object in reinforcement or repair work is provided at a predetermined interval from the widthwise end of the mesh-like object, the overlay work becomes easy. In addition, the overlapping dimensions are constant, ensuring reinforcement strength, beautiful finish, and constant mesh material costs, and standardized reinforcement or repair work can be performed.

It is explanatory drawing which shows the preparation methods of a punch test sample. It is explanatory drawing of the left end surface part of the mesh-like thing which has the identification mark of this invention.

Explanation of symbols

1 U-shaped lid 2 Primer 3 Undercoat resin 4 Mesh-like material 5 Corona-treated surface 6 Overcoat resin 7 Perforation (core part)
10 Mesh 2
11 (Bottom) Warp (layer)
12 Original yarn (identification mark)
13 Oblique yarn (layer)
14 Reverse diagonal thread (layer)
15 (Top) Warp (layer)

Claims (11)

A repair or reinforcement mesh-like material of the concrete structure, the mesh-like material is made of a polyolefin resin, and the surface of one of which is modified to more index 34 mN / m wetting, the other is unmodified surface The polyolefin resin mesh-like product , wherein the non-modified surface is covered as a repaired or reinforced concrete structure side .   The polyolefin resin mesh-like product according to claim 1, wherein an identification mark is provided on either the modified surface or the non-modified surface.   The polyolefin resin mesh-like product according to claim 2, wherein the identification mark is a colored thread or a colored narrow tape.   4. The polyolefin resin according to claim 2, wherein the identification mark is provided at a predetermined interval from an end in the width direction of the mesh-like object, and also serves as a mark of a superposed portion of the mesh-like object in reinforcement or repair work. Made of mesh.   The polyolefin resin mesh according to any one of claims 1 to 4, wherein the polyolefin resin mesh material is one or more of woven fabric, net, knitted fabric, nonwoven fabric, and laminated fabric. State.   A sheath in which the woven fabric, net, or laminated fabric is composed of (a) a core component made of a polyolefin resin and (b) a sheath component made of a polyolefin resin having a melting point 20 ° C. lower than the melting point of the core component. The polyolefin resin mesh-like product according to claim 5, which is composed of a sea-island type composite yarn in which a sheath component of a core type composite fiber is fused, and is formed by heat-sealing the intersection of the composite yarn.   The laminated fabric is formed by laminating the sea-island type composite yarn in at least three directions of warp direction, oblique direction, and reverse oblique direction, and heat-sealing the laminated sea-island type composite yarns. The polyolefin resin mesh material according to claim 6, which is a triaxial laminated fabric.   The polyolefin resin mesh according to claim 7, wherein the sea-island type composite yarn is arranged as an identification mark by placing the original sea-island type composite yarn on the warp at a predetermined interval from both ends in the warp of any one of the warp layer and the warp double layer. State.   The polyolefin resin mesh-like product according to any one of claims 6 to 8, wherein the polyolefin resin mesh-like product is further heated and pressurized.   Repair or reinforcement of a concrete structure, wherein the non-modified surface of the polyolefin resin mesh-like material according to any one of claims 1 to 9 is covered as a repaired or reinforced concrete structure side. Construction method.   The polyolefin resin mesh material according to claim 4 or 8, wherein the non-modified surface of the mesh material is the repaired or reinforced concrete structure side, and the overlapping portion identification mark is A method for repairing or reinforcing a concrete structure, characterized in that, as a reference, the mesh-like object is sequentially overlapped in the width direction for lining.

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