JP2008214133A - Method for coating crevice in concrete surface - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for coating a crevice in a concrete surface by which at least one of performing at a low cost, working with simple procedures, developing superior durability, waterproofing property on a coated part and the like can be achieved. <P>SOLUTION: The method for coating the crevice in the concrete surface is characterized in that an auxiliary tape consisting of unvulcanized rubber is stuck on the concrete surface, to cover the crevice in the concrete surface, and then a solventless paint is coated in a region which is larger than an area stuck with the auxiliary tape and which includes the area stuck with the auxiliary tape on the concrete surface. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for covering a gap in a concrete surface.

As another method for repairing gaps generated in concrete structures, a thick film layer made of a solvent-free paint is attached along a gap (crack) on the concrete surface in a state covering a wider area than the crack. A gap covering structure is known (see Patent Document 1). However, according to the method described in Patent Document 1, when the gap between the concrete surfaces is widened, there is a drawback in that the solvent-free paint may crack and cause water leakage.
JP 2002-54149 A Paragraph No. 0025, etc.

  The present invention can achieve at least one of low cost, performing the operation in a simple procedure, and exhibiting excellent durability and waterproofness in the coated portion, and the like. It is an object of the present invention to provide a coating method.

  That is, the gist of the present invention is that an auxiliary tape made of unvulcanized rubber is applied to a concrete surface so as to cover a gap in the concrete surface, and thereafter includes an area where the auxiliary tape is applied, and the auxiliary tape is The present invention relates to a method for covering a gap on a concrete surface, characterized in that a solvent-free paint is applied to a region on the concrete surface that is larger than the pasted region.

  According to the method for coating a gap in a concrete surface of the present invention, at least one of achieving at low cost, performing by a simple procedure, and exhibiting excellent durability, waterproofness, etc. at a coated portion is achieved. There is an excellent effect of being able to.

  As described above, in the method for covering a gap between concrete surfaces of the present invention, an auxiliary tape made of unvulcanized rubber is applied to the concrete surface so as to cover the gap between the concrete surfaces, and then the auxiliary tape is attached. It is a method characterized by applying a solvent-free paint to an area on the concrete surface that includes an area and is larger than the area to which the auxiliary tape is applied.

  In the concrete surface gap covering method according to the present invention, first, an auxiliary tape made of unvulcanized rubber is applied to the concrete surface so as to cover the gap between the concrete surfaces. In the method for covering the gap between the concrete surfaces of the present invention, since an auxiliary tape made of unvulcanized rubber is used, there is no application between the auxiliary tape and the concrete surface and on the auxiliary tape and the auxiliary tape. In addition to exhibiting excellent adhesiveness with the solvent paint, it exhibits an excellent effect that it can exhibit excellent durability in the coated part. In addition, the method of covering the gap between the concrete surfaces of the present invention uses an auxiliary tape made of unvulcanized rubber, and in combination with the use of a solvent-free paint applied on the auxiliary tape, An excellent effect is exhibited in that excellent waterproofness can be expressed in the coated portion.

  In this specification, “applying the auxiliary tape made of unvulcanized rubber to the concrete surface so as to cover the gap” means that the auxiliary tape having a size exceeding the width and length of the gap is It means sticking along the gap above. In this case, the width and length of the auxiliary tape attached to the gap can be appropriately set according to the size of the gap. The width and length of the auxiliary tape can be appropriately set according to the size of the covering portion, the location, the strength of the auxiliary tape, the adhesiveness to the concrete structure, and the like. On the other hand, the width is desirably 50 mm to 100 mm. The width of the auxiliary tape is preferably 50 mm to 2000 mm for a crack having a width of about 10 mm, for example.

  Any unvulcanized rubber may be used as long as it exhibits shielding properties and adhesion to concrete and solvent-free paint. The unvulcanized rubber is not particularly limited, and examples thereof include unvulcanized butyl rubber.

  The auxiliary tape is preferably a tape obtained by combining unvulcanized rubber and a reinforcing material from the viewpoint of obtaining a higher reinforcing effect. In the concrete surface gap covering method of the present invention, when using a tape obtained by combining unvulcanized rubber and a reinforcing material as the auxiliary tape, the concrete surface gap covering method of the present invention provides a gap. Even when cracks increase over time after coating, the solvent-free coating applied on the auxiliary tape is cured and locally applied to a layer (hereinafter also referred to as “coating film”). An excellent effect can be exerted in that practical stress is substantially suppressed. Examples of the reinforcing material include cloth made of aliphatic polyamide fiber, and specific examples thereof include, but not particularly limited to, fibers made of materials such as nylon (registered trademark).

  Furthermore, in the method for covering a gap between concrete surfaces of the present invention, a solvent-free paint is applied to a region on the concrete surface that includes the region to which the auxiliary tape is applied and is larger than the region to which the auxiliary tape is applied. Apply. Therefore, according to the method for covering a gap between concrete surfaces of the present invention, in combination with the use of the auxiliary tape, an excellent effect that a higher waterproof property can be exhibited at the covered portion is exhibited.

  The solvent-free paint is a paint that does not substantially contain a solvent (for example, toluene, xylene, etc.), and may be any paint having properties such as waterproofness, water resistance, weather resistance, etc., and is not particularly limited. For example, a paint containing a polyurethane resin, a polyurea resin, an epoxy resin, a polyethylene resin, an acrylic resin, or the like as a component can be given. Among these, a polyurethane resin is preferable from the viewpoint of adhesiveness with the auxiliary tape.

  When applying the solvent-free paint, the application range is preferably a range that is 50 to 200 mm wider than the width of the auxiliary tape from the viewpoint of adhesion to concrete.

  In addition, it is desirable to apply the solvent-free paint so that the thickness of the coating film is 1.5 mm or more, preferably 2.0 mm or more, from the viewpoint of waterproofness.

  When the gap is a crack having a width of more than 0 mm and not more than 5 mm and a depth of more than 0 mm and not more than 5 mm, as described above, an auxiliary tape made of unvulcanized rubber so as to cover the gap on the concrete surface. By applying a solvent-free paint to an area on the concrete surface that includes the area where the auxiliary tape is applied and is larger than the area where the auxiliary tape is applied. The gap can be satisfactorily covered (hereinafter also referred to as “method of embodiment 1”).

  When the gap is a crack having a width of 5 mm and exceeding a crack having a depth of 5 mm, or a joint having a width of at least 5 mm and a depth of at least 5 mm, Prior to applying the auxiliary tape to the concrete surface, it is preferable to fill the gap with a backup material (hereinafter also referred to as “method of embodiment 2”).

  The backup material is not particularly limited as long as it exhibits a temporary holding performance at the joint, and examples thereof include polyethylene foam and polypropylene foam.

  In the method according to the second embodiment of the present invention, when the backup material is filled in the gap, the backup material includes, for example, an average diameter (y) in a direction perpendicular to the longitudinal direction of the backup material and the length of the gap. The ratio (y / x) to the width (x) in the direction perpendicular to the direction may be a size that is 1.5 to 1.8.

  In the method for coating a gap between concrete surfaces of the present invention, from the viewpoint of forming a smooth coating film surface after application of the solventless paint, the solventless paint is applied until the solventless paint is cured after the solventless paint is applied. It is preferable to protect the coating film of the solventless paint by applying a non-adhesive film to the area where the paint is applied.

  The non-adhesive film should just have favorable peelability with respect to a solvent-free coating material. Specifically, the non-adhesive film is not particularly limited, and examples thereof include a film made of a polyolefin resin having good peelability. Specific examples of the film made of the polyolefin resin include an unstretched polypropylene film, a uniaxially stretched polypropylene film, a biaxially stretched polypropylene film, and a polyethylene film. Among these, when a non-adhesive film is applied to a region where a solvent-free paint is applied, the non-adhesive film may be stretched to some extent, and therefore, a biaxially stretched polypropylene film is preferable.

  EXAMPLES Hereinafter, although this invention is demonstrated in detail based on an Example, this invention is not limited to this Example.

(Production Example 1)
As shown in FIG. 1, a gap of 0.5 mm width (gap 11 in FIG. 1) was formed by two concrete structures 10 (size: 50 mm × 50 mm × 200 mm, mortar). The obtained product was used as a structure A for crack follow-up test.

(Example 1)
Size that covers the gap 11 of the structure A for crack follow-up test with a tape made of unvulcanized butyl rubber (thickness: 1.0 mm, width: 50 mm, manufactured by Teraoka Co., Ltd., trade name: airtight / waterproof tape 718). It was cut out (width 50 mm × length 50 mm). The obtained tape was used as auxiliary tape 1.

  The auxiliary tape 1 was stuck on the concrete surface of the structure A for crack following test so as to cover the gap 11. When the auxiliary tape 1 was applied, the contact portion between one concrete structure 10 and the auxiliary tape 1 was set to have a width of 50 mm.

  Then, a solvent-free adhesive (Daiichi Kogyo Seiyaku Co., Ltd., trade name: Permaguard 240) was applied in a width of 300 mm from the area where the auxiliary tape 1 was applied. The product after application was cured at 23 ° C. for 7 days. The obtained product (FIG. 1) was used as a sample for a crack following test of Example 1.

(Example 2)
Immediately after application of the solventless paint, Example 1 and Example 1 were applied except that a non-adhesive film 3 (manufactured by Seadom Co., Ltd., polypropylene sheet, product name: PPS-C) was applied to the solventless paint application site. The same was done. The obtained product (FIG. 2) was used as a sample for a crack following test of Example 2.

(Example 3)
The same procedure as in Example 1 was performed except that a tape obtained by complex processing of unvulcanized butyl rubber and nylon (registered trademark) nonwoven fabric was used as the auxiliary tape 1. The obtained product (FIG. 3) was used as a sample for crack follow-up test of Example 3.

Example 4
The same procedure as in Example 2 was performed, except that a tape obtained by subjecting unvulcanized butyl rubber and nylon (registered trademark) nonwoven fabric to composite processing was used as the auxiliary tape 1. The obtained product (FIG. 4) was used as a sample for crack follow-up test of Example 4.

(Production Example 2)
As shown in FIG. 5, a gap of 5 mm width (gap 11 in FIG. 5) was formed by two concrete structures 10 (size: 50 mm × 50 mm × 200 mm, mortar). The obtained product was used as a structure B for crack follow-up test.

(Example 5)
Size that covers the gap 11 of the structure B for crack following test with a tape made of unvulcanized butyl rubber (thickness: 1.0 mm, width: 50 mm, manufactured by Teraoka Co., Ltd., trade name: airtight / waterproof tape 718). A product obtained by cutting out (width 50 mm × length 50 mm) was used as the auxiliary tape 1.

  A backup material 5 (material: foamed polyethylene, manufactured by Takashima Package Co., Ltd., trade name: small round bar, thickness: 8 mm) was filled in the gap 11 of the structure B for crack following test.

  Subsequently, the auxiliary tape 1 was affixed to the concrete surface of the structure B for crack following test so as to cover the gap 11 filled with the backup material.

  Then, a solvent-free adhesive (Daiichi Kogyo Seiyaku Co., Ltd., trade name: Permaguard 240) was applied in a width of 300 mm from the area where the auxiliary tape 1 was applied. The product after application was cured at 23 ° C. for 7 days. The obtained product (FIG. 5) was used as a sample for a crack follow-up test of Example 5.

(Example 6)
Immediately after application of the solventless paint, Example 5 and Example 5 were used except that a non-adhesive film 3 (manufactured by Seadom Co., Ltd., polypropylene sheet, product name: PPS-C) was applied to the application site of the solventless paint. The same was done. The obtained product (FIG. 6) was used as a sample for crack follow-up test of Example 6.

(Example 7)
The same procedure as in Example 5 was performed except that a tape obtained by complex processing of unvulcanized butyl rubber and nylon (registered trademark) nonwoven fabric was used as the auxiliary tape 1. The obtained product (FIG. 7) was used as a sample for crack follow-up test of Example 7.

(Example 8)
The same procedure as in Example 6 was performed except that a tape obtained by complex processing of unvulcanized butyl rubber and nylon (registered trademark) nonwoven fabric was used as the auxiliary tape 1. The obtained product (FIG. 8) was used as a sample for crack follow-up test of Example 8.

(Comparative Example 1)
From above the gap 11 of the structure A for crack follow-up test, a solventless adhesive (Daiichi Kogyo Seiyaku Co., Ltd., trade name: Permguard 240) was applied with a width of 300 mm. The product after application was cured at 23 ° C. for 7 days. The obtained product was used as a crack follow-up test sample of Comparative Example 1.

(Comparative Example 2)
A gum tape (manufactured by Nichiban Co., Ltd., cloth adhesive tape, product name: 102N7-50) was cut into a size (width 50 mm × length 50 mm) covering the gap 11 of the structure A for crack following test.

  The gummed tape was stuck on the concrete surface of the structure A for crack following test so as to cover the gap 11.

  Thereafter, a solvent-free adhesive (Daiichi Kogyo Seiyaku Co., Ltd., trade name: Permaguard 240) was applied in a width of 300 mm from above the area where the gum tape was applied. The product after application was cured at 23 ° C. for 7 days. The obtained product was used as a crack follow-up test sample of Comparative Example 2.

(Comparative Example 3)
It replaced with the gum tape and performed similarly to the comparative example 2 except having used glass cloth (the Nitto Boseki Co., Ltd. make, glass cloth GMex, brand name: KS-5000). The obtained product was used as a crack follow-up test sample of Comparative Example 3.

(Comparative Example 4)
It carried out similarly to the comparative example 2 except having used the nonwoven fabric (The Toyobo Co., Ltd. make, spun bond, brand name: Bonlas, material: polyester) instead of the gum tape. The obtained product was used as a crack follow-up test sample of Comparative Example 4.

(Comparative Example 5)
A backup material 5 (material: foamed polyethylene, manufactured by Takashima Package Co., Ltd., trade name: small round bar, thickness: 8 mm) was filled in the gap 11 of the structure B for crack following test.

  From above the gap 11 filled with the backup material 5, a solvent-free adhesive (Daiichi Kogyo Seiyaku Co., Ltd., trade name: Permguard 240) was applied with a width of 300 mm. The product after application was cured at 23 ° C. for 7 days. The obtained product was used as a crack follow-up test sample of Comparative Example 5.

(Comparative Example 6)
A gum tape (manufactured by Nichiban Co., Ltd., cloth adhesive tape, product name: 102N7-50) was cut into a size (width 50 mm × length 50 mm) covering the gap 11 of the structure A for crack following test.

  A backup material 5 (material: foamed polyethylene, manufactured by Takashima Package Co., Ltd., trade name: small round bar, thickness: 8 mm) was filled in the gap 11 of the structure B for crack following test.

  Subsequently, the said gum tape was affixed on the concrete surface of the structure B for a crack follow-up test so that the clearance gap 11 filled with the backup material 5 might be covered.

  Thereafter, a solvent-free adhesive (Daiichi Kogyo Seiyaku Co., Ltd., trade name: Permaguard 240) was applied in a width of 300 mm from above the area where the gum tape was applied. The product after application was cured at 23 ° C. for 7 days. The obtained product was used as a crack follow-up test sample of Comparative Example 6.

(Comparative Example 7)
It replaced with the gum tape and performed similarly to the comparative example 6 except having used glass cloth (the Nitto Boseki Co., Ltd. make, glass cloth GMex, brand name: KS-5000). The obtained product was used as a crack follow-up test sample of Comparative Example 7.

(Comparative Example 8)
It carried out similarly to the comparative example 6 except having used the nonwoven fabric (The Toyobo Co., Ltd. make, spun bond, brand name: Bonlas, material: polyester) instead of the gum tape. The obtained product was used as a crack follow-up test sample of Comparative Example 8.

(Test Example 1)
The samples of Examples 1-8 and Comparative Examples 1-8 were cured at 23 ° C. for 7 days. Then, as shown in FIG. 9, it pulled 15 mm from the both ends of the sample for a crack follow-up test. The maximum load (kg) when the crack follow-up test sample was pulled, the peel start width (mm) from the base (mortar), and the peel distance (mm) after the test were measured. The maximum load was measured by Instron 5581 manufactured by Instron. The peel start width was measured by measuring the width 102 when the peel in the peel observation target portion 101 in FIG. 9 was visually observed. The peel distance was measured by measuring the distance 103 in FIG. 10 using a caliper. The results are shown in Table 1.

  As a result, as shown in Examples 1 to 8 of Table 1, an auxiliary tape made of unvulcanized butyl rubber, which is unvulcanized rubber, is applied to the concrete surface so as to cover the gaps in the concrete surface, When the solventless paint is applied to the area on the concrete surface that includes the area where the auxiliary tape is applied and is larger than the area where the auxiliary tape is applied, the coating film 2 of the solventless paint from the base It can be seen that no peeling is observed. However, as shown in Comparative Examples 1 and 5 in Table 1, when a solventless paint was applied without applying an auxiliary tape from above the gap 11 on the concrete surface, and Comparative Examples 2 to 4 and Comparative Examples 6 to As shown in FIG. 8, when a tape made of a material other than unvulcanized rubber is used, it can be seen that the solvent-free paint film 2 peels from the base.

  As shown in Table 1, the auxiliary tapes of Examples 3 and 4 and Examples 7 and 8 in which unvulcanized butyl rubber and a nylon (registered trademark) nonwoven fabric as a reinforcing material were combined and processed. In this case, it can be seen that the maximum load is higher than those in Examples 1 and 2 and Examples 5 and 6 using the auxiliary tape made of unvulcanized butyl rubber alone.

  Therefore, according to the methods described in Examples 1 to 8, since the peeling of the coating film 2 of the solventless paint from the base is not observed, it is suggested that water leakage hardly occurs.

FIG. 1 is a diagram showing an outline of one embodiment of the present invention. FIG. 2 is a diagram showing an outline of one embodiment of the present invention. FIG. 3 is a diagram showing an outline of one embodiment of the present invention. FIG. 4 is a diagram showing an outline of one embodiment of the present invention. FIG. 5 is a diagram showing an outline of one embodiment of the present invention. FIG. 6 is a diagram showing an outline of one embodiment of the present invention. FIG. 7 is a diagram showing an outline of one embodiment of the present invention. FIG. 8 is a diagram showing an outline of one embodiment of the present invention. FIG. 9 is a diagram showing an outline of the crack follow-up test (at the start of peeling). FIG. 10 is a diagram showing an outline of the crack follow-up test (after the peel test).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Auxiliary tape 2 Coating film 3 Non-adhesive film 4 Reinforcement material 5 Backup material 10 Concrete structure 11 Crevice 101 Peeling observation target part 102 Width 103 Peeling distance

Claims (5)

  Covering the concrete surface with an auxiliary tape made of unvulcanized rubber so as to cover the gap between the concrete surface, and then including the area where the auxiliary tape is applied and larger than the area where the auxiliary tape is applied A method for covering a gap in a concrete surface, characterized in that a solvent-free paint is applied to an area on the concrete surface.   The method for covering a concrete surface gap according to claim 1, wherein the auxiliary tape made of unvulcanized rubber is obtained by subjecting unvulcanized rubber and a reinforcing material to composite processing.   The method for coating a gap in a concrete surface according to claim 1 or 2, wherein the gap is a crack having a width of more than 0 mm and not more than 5 mm and a depth of more than 0 mm and not more than 5 mm. The gap between the concrete surfaces is a crack having a width of 5 mm and exceeding a crack having a depth of 5 mm, or a joint having a width of at least 5 mm and a depth of at least 5 mm. If
The method for covering a gap in a concrete surface according to any one of claims 1 to 3, wherein the gap is filled with a backup material prior to applying the auxiliary tape to the concrete surface.   A non-adhesive film is applied to an area where the solventless paint is applied to protect the coating film of the solventless paint until the solventless paint is cured after the solventless paint is applied. The covering method of the clearance gap between the concrete surfaces of any one of 1-4.

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