JP2019002168A - Method for surface protection and peeling prevention of concrete, and structure for surface protection and peeling protection of concrete - Google Patents

Abstract

To provide a method for surface protection and peeling prevention of concrete and a structure for surface protection and peeling prevention of concrete, capable of effectively preventing the occurrence of the floating of a sheet, while securing the adhesive strength and workability.SOLUTION: A concrete surface protection and construction method is a concrete surface protection method that protects a concrete surface by attaching a protective sheet on the surface of a concrete structure, and includes the steps of applying an adhesive to a protective sheet 12, and sticking the protective sheet 12 to a surface 11a of the concrete structure 11 via an adhesive 13. A parameter α obtained by dividing the flexural rigidity of the protective sheet 12 by the viscosity of the adhesive 13 satisfies the following relational expression (1). 2.8≤α≤17.0...(1)SELECTED DRAWING: Figure 2

Description

  The present invention relates to a concrete surface protection / peeling prevention method for protecting a concrete surface with a sheet member and a concrete surface protection / peeling prevention structure.

  When a polyester resin sheet (moisture-impermeable sheet) is applied to the surface of a concrete structure using a modified silicone-epoxy adhesive, the temperature of the concrete structure rises due to the effects of solar radiation, etc. The water contained in the structure may volatilize and become water vapor, which may affect the construction part (sheet pasting part).

  At this time, when the pressure (back pressure) of the generated water vapor is applied to the back surface of the sheet (uncured bonded portion), the sheet may peel from the surface of the concrete, and so-called floating may occur. The occurrence of such sheet floating depends on the pressure of water vapor released from the concrete which fluctuates due to elapse of time, temperature rise due to solar radiation, or the like.

  For example, Patent Documents 1 and 2 disclose a method in which a sheet-shaped reinforcing body is formed using a water-permeable material, and water vapor generated from concrete is released to the atmosphere to prevent the sheet from floating.

  Further, for example, Patent Document 3 discloses a method for preventing sheet lifting by providing a groove communicating with the atmosphere in the adhesive layer of the sheet and releasing water vapor generated from the concrete to the atmosphere. Yes.

  Further, for example, Patent Document 4 discloses a method of preventing sheet floating by laminating a sheet having air permeability between the sheet and an object to be pasted and releasing water vapor generated from the concrete to the atmosphere. Has been.

  Further, for example, Patent Document 5 discloses a method of preventing the paint from floating by densifying the surface of the concrete to make it non-permeable and moisture permeable.

JP 2011-32694 A JP-A-10-196115 JP 2000-186254 A JP-A-10-306553 JP 2009-68277 A

However, the conventional method has the following problems.
That is, in the method disclosed in Patent Documents 1 and 2, with a mesh sheet (moisture permeable) adhesive, water vapor in the concrete passes through the adhesive and the sheet and is released to the atmosphere due to the moisture permeability of the adhesive. Is done. However, since the polyester-based resin sheet is a moisture-impermeable sheet, water vapor does not permeate, and the polyester resin sheet may remain inside the sheet and cause the sheet to float.

  Moreover, in the method disclosed in Patent Document 3, since the groove that communicates with the atmosphere is provided in the adhesive layer, the contact area between the concrete and the adhesive may be reduced, and the adhesive strength may be reduced.

  Furthermore, in the method disclosed in Patent Document 4, since a breathable sheet is laminated between the sheet and the object to be attached, the configuration of the sheet is increased by one element. Therefore, a decrease in workability and workability becomes a problem as the number of construction processes increases by one.

  In the method disclosed in Patent Document 5, densification of the concrete surface depends on the properties of the concrete to be constructed, and the effect varies depending on the properties of the concrete. Therefore, the quality of concrete is extremely low, and there is a possibility that the effect is not sufficient for concrete with porous properties.

  An object of the present invention is to provide a concrete surface protection / peeling prevention construction method and a concrete surface protection / peeling prevention structure capable of effectively preventing the occurrence of sheet floating while ensuring adhesive strength and workability. It is to provide.

  The concrete surface protection / peeling prevention method according to the first invention is a concrete surface protection / peeling prevention method for protecting a concrete structure by attaching a protective sheet to the surface of the concrete structure. And a step of applying an adhesive to the surface of the concrete structure through the adhesive. A parameter α obtained by dividing the bending rigidity of the protective sheet by the viscosity of the adhesive satisfies the following relational expression (1).

2.8 ≦ α ≦ 17.0 (1)
Here, in the concrete surface protection and delamination prevention method for protecting by attaching a protective sheet to the surface of the concrete structure, the bending rigidity of the protective sheet attached to the concrete structure is divided by the viscosity of the adhesive. The parameter α is set to be within a predetermined range.

  For example, a polyester-based resin sheet or the like can be used as the protective sheet attached with an adhesive for protecting the surface of the concrete structure and preventing peeling. Moreover, as an adhesive agent, a modified silicone-epoxy adhesive agent etc. can be used, for example.

  Here, when the bending rigidity (sheet elastic modulus × sheet thickness) of the protective sheet is increased, the deformation of the sheet does not follow the steam generated locally due to moisture contained in the concrete. For this reason, the effect which suppresses generation | occurrence | production of the float of a protective sheet can be anticipated. However, when the bending rigidity of the protective sheet is large, the flexibility of the protective sheet is impaired, so that the adhesive may resist the viscosity of the adhesive, and the spring back may cause floating or peeling.

  On the other hand, it is necessary to increase the viscosity of the adhesive in order to suppress the floating and peeling due to the spring back of the protective sheet. However, there is a problem that the workability of the adhesive having a high viscosity decreases in the process of applying to the concrete. is there. Conversely, when the viscosity of the adhesive is lowered, the workability of the coating process is improved, but only a protective sheet having a low bending rigidity can be attached. In this case, the water vapor generated from the concrete may cause the protective sheet to float by deforming the adhesive and pushing up the protective sheet.

  For example, when a moisture-impermeable sheet such as a polyester-based resin sheet is attached as a protective sheet to a concrete wall surface, in order to prevent the protective sheet from floating, the bending rigidity of the protective sheet and the viscosity of the adhesive The balance needs to be optimized.

  Therefore, in the present invention, the value (α value) obtained by dividing the bending rigidity of the protective sheet by the viscosity of the adhesive is set in the above range.

  As a result, by optimizing the value of the parameter α, the balance between the bending rigidity of the protective sheet and the viscosity of the adhesive is taken into consideration, and the protective sheet is lifted while ensuring the adhesive strength and workability. It can be effectively prevented.

  The concrete surface protection / peeling prevention construction method according to the second invention is a concrete surface protection / peeling prevention construction method according to the first invention, wherein the viscosity of the adhesive is 250,000 to 1,250,000 (mPa · s). It is.

  Here, the viscosity of the adhesive used for attaching the protective sheet to the surface of the concrete structure is defined within a predetermined range.

  Thereby, even when the surface of the concrete structure is covered with a protective sheet having a relatively large bending rigidity, it is possible to effectively prevent the protective sheet from floating while ensuring the adhesiveness of the protective sheet.

  The concrete surface protection / peeling prevention construction method according to the third invention is a concrete surface protection / peeling prevention construction method according to the second invention, wherein the viscosity of the adhesive is 300,000 to 800,000 (mPa · s). It is.

  Here, a more preferable range is prescribed | regulated as a viscosity of the adhesive agent used in order to stick a protective sheet on the surface of a concrete structure.

  Accordingly, even when the surface of the concrete structure is covered with a protective sheet having a relatively large bending rigidity, it is possible to more effectively prevent the protective sheet from being lifted while ensuring the adhesion of the protective sheet. .

  The concrete surface protection / peeling prevention construction method according to the fourth invention is a concrete surface protection / peeling prevention construction method according to any one of the first to third inventions, wherein the bending rigidity of the protective sheet is 352 ˜884 (GPa · μm).

  Here, the bending rigidity of the protective sheet attached to the surface of the concrete structure is defined within a predetermined range.

  As a result, even when the surface of the concrete structure is covered with a protective sheet having a relatively high bending rigidity, an adhesive having a relatively high viscosity is used to protect the protective sheet while ensuring the adhesiveness thereof. The occurrence of sheet lifting can be effectively prevented.

  The concrete surface protection / peeling prevention construction method according to the fifth invention is the concrete surface protection / peeling prevention construction method according to the fourth invention, and the thickness of the protective sheet is 75 to 188 (μm).

  Here, the thickness of the protective sheet affixed on the surface of the concrete structure is defined within a predetermined range.

  As a result, even when the surface of the concrete structure is covered with a protective sheet having a relatively large thickness and a relatively high bending rigidity, the adhesive property of the protective sheet can be improved by using an adhesive having a relatively high viscosity. It is possible to more effectively prevent the protective sheet from floating while ensuring the above.

  The concrete surface protection / peeling prevention construction method according to the sixth invention is the concrete surface protection / peeling prevention construction method according to any one of the first to fifth inventions, wherein the protective sheet is a moisture-impermeable sheet. It is.

  Here, a non-permeable sheet is used as an example of a protective sheet that is attached to the surface of the concrete structure.

  Here, as the moisture-impermeable sheet, for example, a polyester resin sheet or the like can be used.

  As a result, even when water vapor generated due to moisture contained in the concrete structure is covered with a moisture-impermeable sheet, it is protected by optimizing the balance between the bending rigidity of the protective sheet and the viscosity of the adhesive. The occurrence of floating can be prevented while securing the adhesiveness of the sheet.

  The concrete surface protection / peeling prevention method according to the seventh invention is a concrete surface protection / peeling prevention method according to any one of the first to sixth inventions, wherein the adhesive is a modified silicone-epoxy. Resin.

  Here, a modified silicone-epoxy resin is used as an example of an adhesive used for attaching a protective sheet to the surface of a concrete structure.

  As a result, even when water vapor generated due to moisture contained in the concrete structure locally pushes up the protective sheet, the viscosity of the protective sheet is adjusted by adjusting the viscosity of the modified silicone-epoxy resin and the viscosity of the adhesive. By optimizing the balance, it is possible to prevent the occurrence of floating while ensuring the adhesion of the protective sheet.

  A concrete surface protection / peeling prevention structure according to an eighth invention is a concrete surface protection / peeling prevention structure that is protected by attaching a protective sheet to the surface of the concrete structure, and the concrete structure, An adhesive for bonding the concrete structure and the protective sheet, and a protective sheet attached to the surface of the concrete structure via the adhesive are provided. A parameter α obtained by dividing the bending rigidity of the protective sheet by the viscosity of the adhesive satisfies the following relational expression (1).

2.8 ≦ α ≦ 17.0 (1)
Here, in a concrete surface protection / peeling prevention structure that protects a concrete structure by attaching a protective sheet to the surface, the bending rigidity of the protective sheet applied to the concrete structure is divided by the viscosity of the adhesive. Parameter α is set to be within a predetermined range.

  For example, a polyester-based resin sheet or the like can be used as the protective sheet attached with an adhesive for protecting the surface of the concrete structure and preventing peeling. Moreover, as an adhesive agent, a modified silicone-epoxy adhesive agent etc. can be used, for example.

  Here, when the bending rigidity (sheet elastic modulus × sheet thickness) of the protective sheet is increased, the deformation of the sheet does not follow the steam generated locally due to moisture contained in the concrete. For this reason, the effect which suppresses generation | occurrence | production of the float of a protective sheet can be anticipated. However, when the bending rigidity of the protective sheet is large, the flexibility of the protective sheet is impaired, so that the adhesive may resist the viscosity of the adhesive, and the spring back may cause floating or peeling.

  On the other hand, it is necessary to increase the viscosity of the adhesive in order to suppress the floating and peeling due to the spring back of the protective sheet. However, there is a problem that the workability of the adhesive having a high viscosity decreases in the process of applying to the concrete. is there. Conversely, when the viscosity of the adhesive is lowered, the workability of the coating process is improved, but only a protective sheet having a low bending rigidity can be attached. In this case, the water vapor generated from the concrete may cause the protective sheet to float by deforming the adhesive and pushing up the protective sheet.

  For example, when a moisture-impermeable sheet such as a polyester-based resin sheet is attached as a protective sheet to a concrete wall surface, in order to prevent the protective sheet from floating, the bending rigidity of the protective sheet and the viscosity of the adhesive The balance needs to be optimized.

  Therefore, in the present invention, the value (α value) obtained by dividing the bending rigidity of the protective sheet by the viscosity of the adhesive is set in the above range.

  As a result, by optimizing the value of the parameter α, the balance between the bending rigidity of the protective sheet and the viscosity of the adhesive is taken into consideration, and the protective sheet is lifted while ensuring the adhesive strength and workability. It can be effectively prevented.

  The concrete surface protection / peeling prevention structure according to the ninth invention is a concrete surface protection / peeling prevention structure according to the eighth invention, wherein the viscosity of the adhesive is 250,000 to 1,250,000 (mPa · s).

  Here, the viscosity of the adhesive used for attaching the protective sheet to the surface of the concrete structure is defined within a predetermined range.

  Thereby, even when the surface of the concrete structure is covered with a protective sheet having a relatively large bending rigidity, it is possible to effectively prevent the protective sheet from floating while ensuring the adhesiveness of the protective sheet.

  The concrete surface protection / peeling prevention structure according to the tenth invention is a concrete surface protection / peeling prevention structure according to the ninth invention, wherein the viscosity of the adhesive is 300,000 to 800,000 (mPa · s).

  A more preferable range is defined as the viscosity of the adhesive used for attaching the protective sheet to the surface of the concrete structure.

  Accordingly, even when the surface of the concrete structure is covered with a protective sheet having a relatively large bending rigidity, it is possible to more effectively prevent the protective sheet from being lifted while ensuring the adhesion of the protective sheet. .

  The concrete surface protection / peeling prevention structure according to the eleventh invention is a concrete surface protection / peeling prevention structure according to any one of the eighth to tenth inventions, wherein the bending rigidity of the protective sheet is 352 to 884 (GPa · μm).

  Here, the bending rigidity of the protective sheet attached to the surface of the concrete structure is defined within a predetermined range.

  As a result, even when the surface of the concrete structure is covered with a protective sheet having a relatively high bending rigidity, an adhesive having a relatively high viscosity is used to protect the protective sheet while ensuring the adhesiveness thereof. The occurrence of sheet lifting can be effectively prevented.

  The concrete surface protection / peeling prevention structure according to the twelfth invention is a concrete surface protection / peeling prevention structure according to the eleventh invention, wherein the protective sheet has a thickness of 75 to 188 (μm). .

  Here, the thickness of the protective sheet affixed on the surface of the concrete structure is defined within a predetermined range.

  As a result, even when the surface of the concrete structure is covered with a protective sheet having a relatively large thickness and a relatively high bending rigidity, the adhesive property of the protective sheet can be improved by using an adhesive having a relatively high viscosity. It is possible to more effectively prevent the protective sheet from floating while ensuring the above.

  A concrete surface protection / peeling prevention structure according to a thirteenth invention is a concrete surface protection / peeling prevention structure according to any one of the eighth to twelfth inventions, wherein the protective sheet is non-permeable. It is a wet sheet.

  Here, an impermeable sheet is used here as an example of a protective sheet that is attached to the surface of the concrete structure.

  Here, as the moisture-impermeable sheet, for example, a polyester resin sheet or the like can be used.

  As a result, even when water vapor generated due to moisture contained in the concrete structure is covered with a moisture-impermeable sheet, it is protected by optimizing the balance between the bending rigidity of the protective sheet and the viscosity of the adhesive. The occurrence of floating can be prevented while securing the adhesiveness of the sheet.

  A concrete surface protection / peeling prevention structure according to a fourteenth invention is a concrete surface protection / peeling prevention structure according to any one of the eighth to thirteenth inventions, wherein the adhesive is a modified silicone. -An epoxy resin.

  Here, a modified silicone-epoxy resin is used as an example of an adhesive used for attaching a protective sheet to the surface of a concrete structure.

  As a result, even when water vapor generated due to moisture contained in the concrete structure locally pushes up the protective sheet, the viscosity of the protective sheet is adjusted by adjusting the viscosity of the modified silicone-epoxy resin and the viscosity of the adhesive. By optimizing the balance, it is possible to prevent the occurrence of floating while ensuring the adhesion of the protective sheet.

  According to the concrete surface protection / peeling prevention method according to the present invention, it is possible to effectively prevent the sheet from being lifted while ensuring the adhesive strength and workability.

Sectional drawing which shows the structure of the surface protection and peeling prevention structure manufactured by the surface protection and peeling prevention construction method of the concrete which concerns on one Embodiment of this invention. The flowchart which shows the flow of a process of the surface protection and peeling prevention construction method of the concrete which concerns on one Embodiment of this invention. Example 1 of the present invention, in which the protective sheet shown in FIG. 1 has a thickness of 188 μm, the bending rigidity of the sheet, the viscosity of the adhesive, the presence or absence of floating when the α value is changed, and the experimental results of workability FIG. Example 2 of the present invention, in which the protective sheet shown in FIG. 1 has a thickness of 125 μm, the bending rigidity of the sheet, the viscosity of the adhesive, the presence or absence of floating when the α value is changed, and the experimental results of workability FIG. Example 3 of the present invention, in which the protective sheet shown in FIG. 1 has a thickness of 100 μm, the bending rigidity of the sheet, the viscosity of the adhesive, the presence or absence of floating when the α value is changed, and the test results of workability FIG. In Example 4 of the present invention, when the thickness of the protective sheet shown in FIG. 1 is 75 μm, the bending rigidity of the sheet, the viscosity of the adhesive, the presence or absence of floating when the α value is changed, and the experimental results of workability. FIG.

  A concrete surface protection / peeling prevention construction method and a concrete surface protection / peeling prevention structure (surface protection / peeling prevention structure 10) according to an embodiment of the present invention will be described below with reference to FIGS. Street.

<Configuration of Concrete Surface Protection / Peeling Prevention Structure 10>
As shown in FIG. 1, a surface protection / peeling prevention structure (concrete surface protection / peeling prevention structure) 10 manufactured by the concrete surface protection / peeling prevention construction method according to the present embodiment includes a concrete structure 11 and The protective sheet 12 and the adhesive 13 are provided.

  The concrete structure 11 is a concrete structure whose surface is protected by a non-breathable protective sheet 12. And in the concrete structure 11, as shown in FIG. 1, the water vapor | steam W1 produced resulting from the water | moisture content contained inside generate | occur | produces.

  Therefore, in the surface protection / peeling prevention structure 10 of the present embodiment, the so-called floating, in which the protection sheet 12 is lifted by the water vapor W1 generated between the surface 11a of the concrete structure 11 and the protection sheet 12, is suppressed. .

  The protective sheet 12 is, for example, a polyester-based moisture-impermeable resin sheet, and is disposed so as to cover the surface 11a of the concrete structure 11 as shown in FIG. And the protective sheet 12 is affixed with respect to the surface 11a of the concrete structure 11 via the adhesive agent 13. FIG.

  The protective sheet 12 may be a resin sheet in which a DLC (Diamond-Like Carbon) film is formed on the surface of a PET (Polyethylene terephthalate) sheet. Thereby, a concrete structure can be protected by sticking the resin sheet excellent in weather resistance on the surface.

  In the present embodiment, it is preferable to use a sheet having a bending rigidity in the range of 352 to 884 (GPa · μm) as the protective sheet 12. Furthermore, as the protective sheet 12, it is preferable to use a sheet having a thickness in the range of 75 to 188 μm in accordance with the range of the bending rigidity.

  The adhesive 13 is, for example, a modified silicone-epoxy adhesive, and is disposed between the surface 11a of the concrete structure 11 and the protective sheet 12 as shown in FIG. And the adhesive agent 13 affixes the protection sheet 12 with respect to the surface 11a of the concrete structure 11. FIG.

  Here, in this embodiment, it is preferable to use the adhesive 13 having a relatively high viscosity in the range of 250,000 to 1,250,000 (mPa · s). Furthermore, it is more preferable to use the adhesive 13 having a viscosity in the range of 300,000 to 800,000 (mPa · s).

  Furthermore, in the surface protection / peeling prevention structure 10 of the present embodiment, the value of the parameter α calculated by dividing the bending elasticity of the protective sheet 12 by the viscosity of the adhesive 13 is expressed by the following relational expression (1 ) Is set to satisfy.

2.8 ≦ α ≦ 17.0 (1)
The value of α can be obtained by the following relational expression (2).

α = viscosity of adhesive 13 (mPa · s) / bending rigidity of protective sheet 12 (GPa · μm) (2)
Thereby, by optimizing the value of the parameter α, the balance between the bending rigidity of the protective sheet 12 and the viscosity of the adhesive 13 is taken into consideration, and the protective sheet 12 is lifted while ensuring the adhesive strength and workability. Can be effectively prevented.

<Concrete surface protection / peeling prevention method>
The concrete surface protection / peeling prevention method of the present invention will be described below with reference to the flowchart of FIG.

  That is, as shown in FIG. 2, in step S11, the protective sheet 12 for covering and protecting the surface 11a of the concrete structure 11 is prepared (preparation step).

  Next, in step S12, the adhesive 13 is applied to the surface 11a of the concrete structure 11, or the adhesive 13 is applied to the back side of the protective sheet 12 (the side facing the surface 11a of the concrete structure 11) ( Adhesive application process).

  Next, in step S13, the protective sheet 12 coated with the adhesive 13 on the back side is applied over the surface 11a of the concrete structure 11 (sheet application process).

  Next, in step S14, curing is performed for a predetermined time until the adhesive 13 is cured (adhesive curing process).

  The concrete surface protection / peeling prevention method of the present embodiment is a method of protecting the concrete sheet 11 by attaching the protective sheet 12 to the surface 11a of the concrete structure 11 as described above. Step S12 which applies adhesive 13 to surface 11a, and Step S13 which sticks protection sheet 12 on surface 11a of concrete structure 11 via adhesive 13 are provided. The parameter α obtained by dividing the bending rigidity of the protective sheet 12 by the viscosity of the adhesive 13 satisfies the following relational expression (1).

2.8 ≦ α ≦ 17.0 (1)
Thereby, by optimizing the value of the parameter α, the balance between the bending rigidity of the protective sheet 12 and the viscosity of the adhesive 13 is taken into consideration, and the protective sheet 12 is lifted while ensuring the adhesive strength and workability. Can be effectively prevented.

<Example>
In the following, whether or not the protective sheet 12 is lifted when the surface protection / peeling prevention structure 10 is manufactured using the method described in the above embodiment, and whether or not the workability of applying the adhesive 13 is reduced, In the following Examples 1-4 (each Example 1-Example 8), the result verified from the viewpoint of the viscosity of the adhesive agent 13 and the bending rigidity of the protective sheet 12 is shown.

  Specifically, in each of Examples 1 to 4, the thickness of the protective sheet 12, the viscosity of the adhesive 13, the bending rigidity of the protective sheet 12 / the viscosity of the adhesive 13 (α value), the presence or absence of lifting, and workability evaluation results Indicates.

  In addition, the elastic modulus (GPa) of the following protective sheets 12 is based on ASTM D882 standard. Moreover, the viscosity measurement of the adhesive 13 is based on JIS Z 8803 (liquid viscosity measurement method) standard, and is measured using a B-type viscometer No. 7 rotor.

  In this embodiment, as shown in FIG. 3, when the thickness of the protective sheet 12 is 188 μm and the bending rigidity is 883.6 (GPa · μm), the value of the parameter α and the presence or absence of floating, whether or not the workability is reduced The result of having verified about the relationship with is shown.

  That is, in this example, when the thickness of the protective sheet 12 is 188 μm, that is, when the bending rigidity is constant at 883.6 (GPa · μm), the viscosity (α value) of the adhesive 13 is changed in eight steps. The presence or absence of buoyancy and the deterioration of workability are being verified.

Specifically, in Examples 1 to 8, the viscosity of the adhesive 13 was changed in eight steps, such as 20, 35, 50, 65, 80, 95, 110, and 125 (× 10 ⁴ mPa · s).

  Accordingly, the α value changed to 44.18, 25.25, 17.67, 13.59, 11.05, 9.30, 8.03, 7.07 in Examples 1 to 8. .

  As a result, in the case of Example 1 (α value = 44.18), the protective sheet 12 did not float. On the other hand, regarding workability when applying the adhesive 13, since the bending rigidity of the protective sheet 12 was too large (α value was too large), the workability was reduced.

  In the case of Example 2 (α value = 25.25), the protective sheet 12 did not float. On the other hand, regarding workability when applying the adhesive 13, since the bending rigidity of the protective sheet 12 was too large (α value was too large), the workability was reduced.

  In the case of Example 3 (α value = 17.67), the protective sheet 12 did not float. On the other hand, regarding workability when applying the adhesive 13, since the bending rigidity of the protective sheet 12 was too large (α value was too large), the workability was reduced.

  Further, in the case of Example 4 (α value = 15.99), the protective sheet 12 did not float and the workability when the adhesive 13 was applied was not deteriorated.

  Further, in the case of Example 5 (α value = 11.05), the protective sheet 12 did not float and the workability when applying the adhesive 13 was not deteriorated.

  Further, in the case of Example 6 (α value = 9.30), the protective sheet 12 did not float and the workability at the time of applying the adhesive 13 was not observed.

  Further, in the case of Example 7 (α value = 8.03), the protective sheet 12 did not float and the workability when the adhesive 13 was applied was not deteriorated.

  Further, in the case of Example 8 (α value = 7.07), the protective sheet 12 did not float and the workability when applying the adhesive 13 was not observed.

  As described above, as a result of Examples 1 to 8 included in Example 1, if the range is 7.07 ≦ α ≦ 13.59, the protective sheet 12 does not float and the adhesive 13 is applied. It was found that there was no decrease in workability when performing the process.

  In this example, as shown in FIG. 4, when the thickness of the protective sheet 12 is 125 μm and the bending rigidity is 587.5 (GPa · μm), the value of the parameter α and the presence or absence of floating, the presence or absence of deterioration in workability The result of having verified about the relationship with is shown.

  That is, in this example, when the thickness of the protective sheet 12 is 125 μm, that is, when the bending rigidity is constant at 587.5 (GPa · μm), the viscosity (α value) of the adhesive 13 is changed in eight steps. The presence or absence of buoyancy and the deterioration of workability are being verified.

Specifically, in Examples 1 to 8, as in Example 1 above, the viscosity of the adhesive 13 was 20, 35, 50, 65, 80, 95, 110, 125 (× 10 ⁴ mPa · s) and 8 Changed in stages.

  Accordingly, the α value changed to 29.38, 16.79, 11.75, 9.04, 7.34, 6.18, 5.34, 4.70 in Examples 1 to 8. .

  As a result, in the case of Example 1 (α value = 29.38), the viscosity of the adhesive is too small (α value is too large) with respect to the bending rigidity of the protective sheet 12, and thus the protective sheet 12 is not lifted. Occurred. On the other hand, the workability when applying the adhesive 13 was not reduced.

  Moreover, in the case of Example 2 (α value = 16.79), the protective sheet 12 did not float and the workability when applying the adhesive 13 was not observed.

  Further, in the case of Example 3 (α value = 11.75), the protective sheet 12 did not float and the workability when applying the adhesive 13 was not observed.

  Further, in the case of Example 4 (α value = 9.04), the protective sheet 12 did not float and the workability when applying the adhesive 13 was not deteriorated.

  Further, in the case of Example 5 (α value = 7.34), the protective sheet 12 did not float and the workability at the time of applying the adhesive 13 was not observed.

  Further, in the case of Example 6 (α value = 6.18), the protective sheet 12 did not float and the workability at the time of applying the adhesive 13 was not observed.

  Further, in the case of Example 7 (α value = 5.34), the protective sheet 12 did not float and the workability at the time of applying the adhesive 13 was not observed.

  Moreover, in the case of Example 8 (α value = 4.70), the protective sheet 12 did not float and the workability when applying the adhesive 13 was not observed.

  As described above, as a result of Examples 1 to 8 included in Example 2, when the range of 4.70 ≦ α ≦ 16.79 is satisfied, the protective sheet 12 does not float and the adhesive 13 is applied. It was found that there was no decrease in workability when performing the process.

  In the present embodiment, as shown in FIG. 5, when the thickness of the protective sheet 12 is 100 μm and the bending rigidity is 470 (GPa · μm), the value of the parameter α and the presence or absence of occurrence of floating, the presence or absence of deterioration in workability The result of verifying the relationship is shown.

  That is, in this example, when the thickness of the protective sheet 12 is 100 μm, that is, when the bending rigidity is constant at 470 (GPa · μm), the floating when the viscosity (α value) of the adhesive 13 is changed in eight steps. The presence or absence of occurrence and the presence or absence of workability deterioration are verified.

Specifically, in Examples 1 to 8, as in Example 1 above, the viscosity of the adhesive 13 was 20, 35, 50, 65, 80, 95, 110, 125 (× 10 ⁴ mPa · s) and 8 Changed in stages.

  Accordingly, the α value changed to 23.5, 13.43, 9.40, 7.23, 5.88, 4.95, 4.27, and 3.76 in Examples 1 to 8. .

  As a result, in the case of Example 1 (α value = 23.5), since the viscosity of the adhesive is too small (α value is too large) with respect to the bending rigidity of the protective sheet 12, the protective sheet 12 is not lifted. Occurred. On the other hand, the workability when applying the adhesive 13 was not reduced.

  Further, in the case of Example 2 (α value = 13.43), the protective sheet 12 did not float and the workability at the time of applying the adhesive 13 was not observed.

  Further, in the case of Example 3 (α value = 9.40), the protective sheet 12 did not float, and the workability when applying the adhesive 13 was not observed.

  Further, in the case of Example 4 (α value = 7.23), the protective sheet 12 did not float and the workability when applying the adhesive 13 was not observed.

  Further, in the case of Example 5 (α value = 5.88), the protective sheet 12 did not float and the workability when applying the adhesive 13 was not observed.

  Further, in the case of Example 6 (α value = 4.95), the protective sheet 12 did not float, and the workability when applying the adhesive 13 was not observed.

  Further, in the case of Example 7 (α value = 4.27), the protective sheet 12 did not float, and the workability when applying the adhesive 13 was not observed.

  Further, in the case of Example 8 (α value = 3.76), the protective sheet 12 did not float and the workability at the time of applying the adhesive 13 was not observed.

  As described above, as a result of Examples 1 to 8 included in Example 3, if the range is 3.76 ≦ α ≦ 13.43, the protective sheet 12 does not float and the adhesive 13 is applied. It was found that there was no decrease in workability when performing the process.

  In this embodiment, as shown in FIG. 6, when the thickness of the protective sheet 12 is 75 μm and the bending rigidity is 352.5 (GPa · μm), the value of the parameter α and the presence or absence of floating, the presence or absence of deterioration in workability The result of having verified about the relationship with is shown.

  That is, in this example, when the thickness of the protective sheet 12 is 75 μm, that is, when the bending rigidity is constant at 352.5 (GPa · μm), the viscosity (α value) of the adhesive 13 is changed in eight steps. The presence or absence of buoyancy and the deterioration of workability are being verified.

Specifically, in Examples 1 to 8, as in Example 1 above, the viscosity of the adhesive 13 was 20, 35, 50, 65, 80, 95, 110, 125 (× 10 ⁴ mPa · s) and 8 Changed in stages.

  Accordingly, the α value changed to 17.63, 10.07, 7.05, 5.42, 4.41, 3.71, 3.20, 2.82 in Examples 1 to 8. .

  As a result, in the case of Example 1 (α value = 17.63), the viscosity of the adhesive is too small (α value is too large) with respect to the bending rigidity of the protective sheet 12, and thus the protective sheet 12 is not lifted. The problem that occurred. On the other hand, the workability when applying the adhesive 13 was not reduced.

  Further, in the case of Example 2 (α value = 10.07), the protective sheet 12 did not float and the workability when applying the adhesive 13 was not observed.

  Further, in the case of Example 3 (α value = 7.05), the protective sheet 12 did not float and the workability when applying the adhesive 13 was not observed.

  Further, in the case of Example 4 (α value = 5.42), the protective sheet 12 did not float and the workability when applying the adhesive 13 was not observed.

  Further, in the case of Example 5 (α value = 4.41), the protective sheet 12 did not float and the workability when applying the adhesive 13 was not observed.

  Further, in the case of Example 6 (α value = 3.71), the protective sheet 12 did not float and the workability when applying the adhesive 13 was not observed.

  Further, in the case of Example 7 (α value = 3.20), the protective sheet 12 did not float, and the workability when applying the adhesive 13 was not observed.

  In the case of Example 8 (α value = 2.82), the protective sheet 12 did not float. On the other hand, regarding the workability at the time of applying the adhesive 13, since the viscosity of the adhesive 13 was too high (α value was too small), the workability was reduced.

  As described above, if the results of Examples 1 to 8 included in Example 4 are in the range of 3.20 ≦ α ≦ 10.07, the protective sheet 12 does not float and the adhesive 13 is applied. It was found that there was no decrease in workability when performing the process.

<Summary of Examples>
As a result of the verification in each of the above Examples 1 to 4, it was found that the workability of the adhesive 13 is lowered in the low-viscosity region due to deterioration of the spring back of the protective sheet or stringing or sharpening.

  On the other hand, in the adhesive 13, the defoaming of the air that has entered between the protective sheet 12 and the adhesive 13 becomes difficult due to the relationship with the bending rigidity of the protective sheet 12, and the adhesive 13 The problem that workability | operativity of the application | coating work fell occurred.

  The value of the parameter α indicating the relationship between the rigidity of the protective sheet 12 and the viscosity of the adhesive 13 is such that a defoaming operation for removing the air caught between the protective sheet 12 and the concrete structure 11 is possible, and It turned out that it is preferable to set to the range of 2.8-17.0 in which the protection sheet 12 does not float.

  And it turned out that the range of the value of parameter (alpha) in which the float of the protective sheet 12 does not generate | occur | produce, while ensuring further favorable adhesiveness and workability | operativity is 3.7-13.5.

In addition, the range of the viscosity of the adhesive 13 that can prevent the floating of the protective sheet 12 and ensure the adhesiveness and workability depends on the bending rigidity (thickness) of the protective sheet 12, but is 25 to 125 (× 10 ⁴ mPa · s).

And in order to acquire further favorable workability | operativity, it turned out that it is preferable to use the adhesive agent 13 with the viscosity of the range of 30-80 (* 10 < ⁴ > mPa * s).

  In addition, regarding the bending rigidity of the protective sheet 12, if the balance with the viscosity of the adhesive 13 is adjusted, all the bending rigidity 352 to 884 (GPa · μm) verified in the above examples have good adhesiveness and work. The effect which suppresses the float of the protection sheet 12 was acquired while being able to acquire property.

  Furthermore, regarding the thickness of the protective sheet 12, if the balance with the viscosity of the adhesive 13 is adjusted, good adhesiveness and workability can be obtained for all thicknesses 75 to 188 (μm) verified in the above examples. And the effect of suppressing the floating of the protective sheet 12 was obtained.

[Other Embodiments]
As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the summary of invention.

(A)
In the said embodiment, the adhesive agent 13 was apply | coated to the back surface side of the protection sheet 12 in the process of apply | coating the adhesive agent 13, and the example stuck on the surface 11a of the concrete structure 11 in the sticking process was given and demonstrated. However, the present invention is not limited to this.
For example, in the adhesive application step, the adhesive may be applied to the surface side of the concrete structure.
Even in this case, the same effects as those described in the above embodiment can be obtained.

(B)
In the said embodiment, the example using a non-moisture-permeable sheet was given and demonstrated as the protective sheet 12 affixed on the surface 11a of the concrete structure 11. FIG. However, the present invention is not limited to this.
For example, the sheet is not limited to the non-moisture permeable 6 sheet that does not allow moisture to pass completely, and a sheet that does not easily pass moisture may be used.

(C)
In the said embodiment, the example which used polyester-type resin sheets, such as PET, was given and demonstrated as the protective sheet 12 affixed on the surface 11a of the concrete structure 11. FIG. However, the present invention is not limited to this.
Moreover, you may use the sheet | seat of the multilayer structure in which the thin film of one layer or multiple layers was formed in the surface as a protective sheet.

(D)
In the above-described embodiment, an example in which a modified silicone-epoxy adhesive is used as the adhesive 13 used for attaching the protective sheet 12 to the surface 11a of the concrete structure 11 has been described. However, the present invention is not limited to this.
The adhesive used may be a one-component resin composition or a two-component mixture of a two-component mixed resin composition.

  The concrete surface protection / peeling prevention method of the present invention has the effect of effectively preventing the occurrence of sheet lifting while ensuring adhesive strength and workability. It can be widely applied to the method of attaching.

10 Surface protection / peeling prevention structure (concrete surface protection / peeling prevention structure)
11 Concrete structure 11a Surface 12 Protective sheet 13 Adhesive W1 Water vapor

Claims (14)

A concrete surface protection and delamination prevention method that protects a concrete structure by attaching a protective sheet to the surface.
Applying an adhesive to the surface of the protective sheet or the concrete structure;
A step of attaching the protective sheet to the surface of the concrete structure via the adhesive;
With
Parameter α obtained by dividing the bending rigidity of the protective sheet by the viscosity of the adhesive satisfies the following relational expression (1):
Concrete surface protection and peeling prevention method.
2.8 ≦ α ≦ 17.0 (1) The adhesive has a viscosity of 250,000 to 1.25 million (mPa · s).
The concrete surface protection / peeling prevention construction method according to claim 1. The adhesive has a viscosity of 300,000 to 800,000 (mPa · s).
The concrete surface protection / peeling prevention method according to claim 2. The bending rigidity of the protective sheet is 352 to 884 (GPa · μm).
The concrete surface protection / peeling prevention construction method according to any one of claims 1 to 3. The thickness of the protective sheet is 75 to 188 (μm).
The concrete surface protection / peeling prevention construction method according to claim 4. The protective sheet is a moisture-impermeable sheet.
The concrete surface protection / peeling prevention construction method according to any one of claims 1 to 5. The adhesive is a modified silicone-epoxy resin.
The concrete surface protection / peeling prevention construction method according to any one of claims 1 to 6. A concrete surface protection / peeling prevention structure that is protected by attaching a protective sheet to the surface of the concrete structure,
A concrete structure,
An adhesive that bonds the concrete structure and the protective sheet;
A protective sheet attached to the surface of the concrete structure via the adhesive;
With
Parameter α obtained by dividing the bending rigidity of the protective sheet by the viscosity of the adhesive satisfies the following relational expression (1):
Concrete surface protection / peeling prevention structure.
2.8 ≦ α ≦ 17.0 (1) The adhesive has a viscosity of 250,000 to 1.25 million (mPa · s).
The surface protection / peeling prevention structure for concrete according to claim 8. The adhesive has a viscosity of 300,000 to 800,000 (mPa · s).
The concrete surface protection / peeling prevention structure according to claim 9. The bending rigidity of the protective sheet is 352 to 884 (GPa · μm).
The surface protection / peeling prevention structure for concrete according to any one of claims 8 to 10. The thickness of the protective sheet is 75 to 188 (μm).
The concrete surface protection / peeling prevention structure according to claim 11. The protective sheet is a moisture-impermeable sheet.
The concrete surface protection / peeling prevention structure according to any one of claims 8 to 12. The adhesive is a modified silicone-epoxy resin.
The concrete surface protection / peeling prevention structure according to any one of claims 8 to 13.

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