JP2017048669A - Floor slab waterproof structure primer, floor slab waterproof structure construction method, and floor slab waterproof structure construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a primer for a floor slab waterproof construction, which can be dried and cured in a short period of time even when applied to a concrete floor slab surface where fine powder and an asphalt component remain, and which can be firmly fixed to a concrete floor slab after being cured.SOLUTION: An epoxy primer for a floor slab waterproof construction includes alcohol of 10-95 mass% as a solvent.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a primer for waterproofing a floor slab, a method for constructing a waterproof waterproof slab using the same, and a method for constructing a waterproof waterproof slab.

  When repairing or maintaining an expressway, remove the asphalt pavement with a cutting machine, backhoe, water jet, shot blast, etc. to expose the concrete floor slab, and then apply a waterproof layer on the top surface of the concrete floor slab. Form a waterproof structure with floor slabs. In this case, since it is necessary to firmly bond the waterproof layer to the concrete floor slab, for example, the waterproof layer is provided on the upper surface of the concrete floor slab via the adhesive layer.

  Here, fine powder is generated on the surface of the concrete slab due to shot blasting or the like, but it takes considerable effort, labor, and time to completely remove the fine powder from the surface of the concrete slab. And it is not realistic. When fine powder remains on the surface of the concrete slab, even if an adhesive is directly applied thereto, sufficient adhesive strength cannot be secured due to the influence of the fine powder. Therefore, in order to ensure sufficient adhesive strength, a primer is applied on the top surface of the concrete slab and cured, and then an adhesive layer may be provided thereon.

  Epoxy primers and MMA primers containing a solvent (xylene, toluene, etc.) are widely used as primers for floor slab waterproof structures (Patent Documents 1 and 2). Since the primer containing the solvent is cured on the surface of the concrete floor slab while penetrating into the fine powder (or while taking in the fine powder), it can be firmly fixed to the concrete floor slab after curing. Moreover, since the surface of the cured primer is almost free of fine powder and unevenness is reduced, it can be an appropriate surface for providing the adhesive layer.

Patent No. 3956757 JP 2012-021315 A

  On the other hand, components other than fine powder may remain on the surface of the concrete slab. For example, when removing an asphalt pavement with a cutting machine or the like, it is not practical to completely remove the asphalt component from the surface of the concrete slab, requiring considerable labor, labor, and time. Therefore, usually, the primer is applied with the asphalt component remaining on the surface of the concrete slab in addition to the fine powder described above.

  However, when a primer containing a conventional solvent (xylene, toluene, etc.) is applied to the concrete floor slab with asphalt components remaining, adhesion of the primer by repelling or dissolving (cutback) the solvent-based primer on the asphalt residue. The force may decrease, and the primer may become sticky, and it may take a long time to dry and cure the primer. Moreover, when using a MMA-type primer, hardening failure may be caused by the influence of an asphalt component.

  In view of such circumstances, the present invention can be dried and hardened in a short time even when applied to the surface of a concrete floor slab where fine powder or asphalt components remain, and is firmly attached to the concrete floor slab after hardening. An object of the present invention is to provide a primer for waterproofing a floor slab that can be fixed to a floor. It is another object of the present invention to provide a method of constructing a floor slab waterproof structure in a short time using the primer for floor slab waterproof structure.

As a result of diligent research to solve the above problems, the present inventors have obtained the following knowledge.
(1) When alcohol is used as the solvent that constitutes the primer, the solvent can be prevented from repelling and dissolving on the asphalt residue, the primer can be cured in a short time, and after curing, the concrete slab is strong. Can be fixed. That is, adverse effects due to asphalt residues can be reduced.
(2) When an alcohol is used as a solvent constituting the primer, the alcohol is highly volatile and can be dried in a short time.
(3) When alcohol is used as the solvent constituting the primer, the viscosity can be sufficiently reduced, and the surface of the concrete slab can be cured while penetrating fine powder. That is, the adverse effect of fine powder can be reduced.
(4) Compared to conventionally used solvents (xylene, toluene, etc.), alcohol has reduced adverse effects on humans and has good on-site workability.
(5) If it is an epoxy-type primer, even if an asphalt component remains, it can be cured satisfactorily.

The present invention has been made based on the above findings. That is,
1st this invention is an epoxy-type primer for floor slab waterproofing structures which contains alcohol 10 mass% or more and 95 mass% or less as a solvent.

In the present invention, “containing 10% by mass to 95% by mass of alcohol as a solvent” in other words includes 10% by mass to 95% by mass of liquid alcohol based on the whole primer (100% by mass). Means that
“For floor slab waterproof structure” means to be used when a waterproof slab structure is formed by forming a waterproof layer above a concrete floor slab.
The “epoxy primer” means a material that cures by a reaction between an epoxy resin and a curing agent, that is, at least an epoxy resin or a curing agent is used in addition to the alcohol described above.

  In the first aspect of the present invention, the alcohol is preferably an alcohol having a boiling point of less than 100 ° C. Thereby, alcohol can be volatilized and removed in a shorter time and with less energy, and the drying time can be further shortened. In addition, since the viscosity of the solvent is low, the primer is more easily penetrated into the fine powder. In the present application, “boiling point” means a normal boiling point.

  In 1st this invention, it is preferable that carbon number of alcohol is 2-4. Also in this case, alcohol can be volatilized and removed in a shorter time and energy saving, and the drying time can be further shortened. In addition, since the viscosity of the solvent is low, the primer is more easily penetrated into the fine powder.

  The epoxy primer for floor slab waterproof structure according to the first aspect of the present invention is preferably a two-component primer comprising a main agent containing an epoxy resin and a curing agent containing a component for curing the epoxy resin. In this case, when the main agent and the curing agent are mixed based on the epoxy equivalent of the epoxy resin and the active hydrogen equivalent of the component that cures the epoxy resin, an alcohol as a solvent in the mixture is 10% by mass or more. It is preferable to contain 95% by mass or less. In other words, when the main agent and the curing agent are mixed at a mixing ratio suitable for curing the epoxy resin in the main agent, the amount of the alcohol solvent in the mixture after the mixing becomes 10% by mass to 95% by mass. It is preferable to do so. By using a two-component type consisting of a main agent and a curing agent, workability and handling on site is improved.

  In the two-pack type first invention, the component for curing the epoxy resin is preferably an amine.

  In 1st this invention, it is preferable that content of solvents other than alcohol is 40 mass% or less. In other words, the primer may contain a solvent other than alcohol as a solvent as long as the effects of the present invention are not impaired.

  In the first aspect of the present invention, the inorganic filler is preferably contained in an amount of 1% by mass or more and 50% by mass or less.

  The second aspect of the present invention is a first step of applying a primer for waterproofing a floor slab structure according to the first aspect of the present invention to the upper surface of a concrete floor slab to form a primer layer, and a step of drying and curing the primer layer. A floor slab waterproofing construction method comprising two steps and a third step of forming a waterproof layer on the top surface of the dried and cured primer layer.

  In the second aspect of the present invention, the concrete floor slab may have an asphalt component on part or all (preferably part) of the surface, and the asphalt component remains on the surface of the concrete floor slab, The first step can be performed. This can greatly shorten the construction period. The “asphalt component” in this case is an asphalt primer that contributed to the joining of the concrete floor slab and the asphalt pavement (or waterproof layer) when the existing asphalt pavement (and waterproof layer) was peeled off from the concrete floor slab. Residue, asphalt adhesive residue, asphalt waterproofing material residue, asphalt pavement-derived asphalt residue, and the like.

  For example, in the second aspect of the present invention, before the first step, the method includes a step of peeling a pavement containing an asphalt component provided above the concrete floor slab and exposing the concrete floor slab, The first step may be performed with the asphalt component remaining in part or all (preferably part). In other words, the construction method according to the second aspect of the present invention is performed without removing the asphalt component from the concrete slab surface completely after removing the pavement with a cutting machine or the like when repairing or maintaining an expressway or the like. Can be implemented.

In the second aspect of the present invention, the waterproof layer is preferably a waterproof layer containing a urethane resin.
The “urethane resin” is a resin containing at least one of a urea resin, a urethane resin, and a urea urethane resin.

  A floor slab waterproof structure can be obtained by paving asphalt, for example, on the floor slab waterproof structure constructed according to the second aspect of the present invention. That is, the third aspect of the present invention includes a step of constructing a floor slab waterproof structure by the method according to the second aspect of the present invention, a fourth step of forming a binder layer on the upper surface of the waterproof layer of the floor slab waterproof structure, Waterproofing the floor slab, comprising a fifth step of drying and curing the layer, a sixth step of forming an adhesive layer on the upper surface of the dried and cured binder layer, and a seventh step of applying asphalt pavement to the upper surface of the adhesive layer It is a construction method of a structure.

  In 3rd invention, after forming a binder layer in a 4th process, after spreading a silica sand to this binder layer in a 5th process, the construction method of drying and hardening this binder layer can be employ | adopted preferably.

  According to the present invention, by using an epoxy-based primer containing a predetermined amount of alcohol as a solvent, it can be dried and cured in a short time even when applied to the concrete floor slab surface where fine powder and asphalt components remain, and A primer for waterproofing a floor slab that can be firmly fixed to a concrete slab after curing can be provided. Moreover, the method of constructing a floor slab waterproof structure in a short time using the primer for floor slab waterproof structure can be provided.

It is a figure for demonstrating the construction method (S10) of a floor slab waterproof structure. It is the schematic for demonstrating the method of constructing the floor slab waterproofing structure. It is a figure for demonstrating the construction method (S20) of a floor slab waterproof structure. It is the schematic for demonstrating the method of constructing the floor slab waterproof structure. It is a figure for demonstrating the method of constructing a paved road as a floor slab waterproof structure using the construction method of a floor slab waterproof structure. It is a figure for demonstrating the method of constructing a paved road as a floor slab waterproof structure using the construction method of a floor slab waterproof structure. It is the schematic which shows the floor slab waterproofing structure used in the Example.

1. Primer for floor slab waterproof structure The primer for floor slab waterproof structure according to the present invention is characterized by containing 10% by mass to 95% by mass of alcohol as a solvent.

1.1. Alcohol The primer according to the present invention contains alcohol as a solvent. Alcohol hardly repels or dissolves on the asphalt residue, can cure the primer in a short time, and can be firmly fixed to the concrete slab after curing. That is, adverse effects due to asphalt residues can be reduced. Moreover, since alcohol has high volatility, it can be dried in a short time. Moreover, by using alcohol as a solvent, the viscosity of the primer as a whole can be sufficiently lowered, and the primer can be cured while penetrating fine powder on the surface of the concrete slab. That is, the adverse effect of fine powder can be reduced. Furthermore, compared with a conventionally used solvent (such as xylene), alcohol has a reduced adverse human effect, and the workability on site is good.

  In the primer according to the present invention, the alcohol may be liquid. In particular, an alcohol having a boiling point of less than 100 ° C. is preferable. Specifically, methanol (boiling point 64.7 ° C), ethanol (boiling point 78.37 ° C), 1-propanol (boiling point: 97.5 ° C), isopropanol (boiling point 82.4 ° C), 2-butanol (boiling point 99). .0 ° C.) and the like. Alternatively, a preferred alcohol can be defined from the viewpoint of carbon number. That is, the alcohol preferably has 4 or less carbon atoms. More preferred are those having 2 to 4 carbon atoms. When such an alcohol is used, the alcohol can be volatilized and removed in a shorter time and energy saving, and the drying time can be further shortened. In addition, since the viscosity of the solvent is low, the primer is more easily penetrated into the fine powder. In the present invention, one kind of alcohol may be used alone, or several kinds of alcohols may be mixed and used.

  In the primer which concerns on this invention, alcohol is contained 10 mass% or more and 95 mass% or less as a solvent. Preferably they are 30 mass% or more and 90 mass% or less. More preferably, it is 50 mass% or more and 90 mass% or less. In the present invention, the effects as described above can be appropriately exhibited by including a large amount of alcohol in the primer.

  The primer which concerns on this invention is an epoxy-type primer containing alcohol as a solvent, and cures an epoxy resin with a hardening | curing agent. That is, the primer according to the present invention is characterized in that an alcohol solvent is used instead of at least a part (preferably substantially all) of a solvent such as xylene in the conventional epoxy primer, and the other configuration As for, it is also possible to be the same as the conventional epoxy primer.

  In consideration of on-site workability, the primer according to the present invention is preferably a two-component type. That is, it is preferable to use a two-component primer comprising a main agent containing an epoxy resin and a curing agent containing a component for curing the epoxy resin. In this case, it is preferable that alcohol is contained as a solvent in both the main agent and the curing agent.

1.2. Main Agent The main agent preferably contains an epoxy resin and contains 10% by mass to 95% by mass of alcohol as a solvent. As the epoxy resin, the same epoxy resin as that contained in a conventional epoxy primer can be applied. You may mix and use several types of epoxy resins. The alcohol is the same as described above.

  The content of alcohol in the main agent is more preferably 15% by mass or more, further preferably 20% by mass or more, more preferably 90% by mass or less, and further preferably 80% by mass or less. The content of the epoxy resin in the main agent is preferably 5% by mass or more, more preferably 10% by mass or more, further preferably 20% by mass or more, preferably 90% by mass or less, more preferably 85% by mass or less, Preferably it is 80 mass% or less.

1.3. Curing Agent The curing agent includes a component that cures the epoxy resin. The component (curing component) for curing the epoxy resin is the same as the component contained in the conventional epoxy primer, and one having active hydrogen can be applied. For example, an amine is preferable. Since the curing reaction of the epoxy resin with amine is known, the description thereof is omitted here.

  It is preferable that a hardening | curing agent contains alcohol as a solvent. The alcohol is the same as described above. When the curing agent contains alcohol as a solvent, the alcohol content in the curing agent is adjusted according to the ratio of the main agent and the curing agent. When the main agent and the curing agent are mixed at a mass ratio of 1: 1, the alcohol content in the curing agent is preferably 10% by mass or more, more preferably 40% by mass or more, and even more preferably 60% by mass. It is above, Preferably it is 99 mass% or less, More preferably, it is 98 mass% or less, More preferably, it is 96 mass% or less. In this case, the content of the curing component in the curing agent is preferably 1% by mass or more, more preferably 2% by mass or more, further preferably 4% by mass or more, preferably 90% by mass or less, more preferably 50% by mass. % Or less, more preferably 20% by mass or less.

  The curing agent may contain a known curing accelerator. As the curing accelerator, for example, tertiary amine, phenol and derivatives thereof are preferable. When a curing accelerator is included, the content is preferably 50% by mass or less based on the entire curing agent (100% by mass). Although a minimum is not specifically limited, For example, it is 1 mass%.

  Such a two-component primer is mixed and used at the construction site. The mixing ratio may be appropriately adjusted in consideration of the epoxy equivalent of the epoxy resin and the active hydrogen equivalent of the amine. For example, when an epoxy resin (main agent) having an epoxy equivalent of 200 and an amine (curing agent) having an active hydrogen equivalent of 100 are mixed, the mixing is performed so that the main agent: curing agent = 200: 100 (mass ratio). It is preferable to do.

  Here, the two-component primer is used as a solvent in the mixture when the main agent and the curing agent are mixed based on the epoxy equivalent of the epoxy resin and the active hydrogen equivalent of the component that cures the epoxy resin. It is preferable that the alcohol is contained in an amount of 10% by mass to 95% by mass. More preferably, alcohol is contained in the mixture after mixing as a solvent in an amount of 30% by mass to 90% by mass, and particularly preferably 50% by mass to 90% by mass. On the other hand, in the mixture, it is preferable that the content of a solid content (component remaining as a solid content after curing) is 5% by mass or more and 90% by mass or less. The solid content is more preferably 10% by mass or more and 50% by mass or less. By setting the content of alcohol and solids in the mixture after mixing in such a range, even when applied to the concrete floor slab surface where fine powder and asphalt components remain, it can be dried and cured in a short time. And after hardening, it can be more firmly fixed to the concrete slab.

The viscosity at 25 ° C. after mixing the two-component primer is preferably 0.1 to 800 mPa · s, and more preferably 0.5 to 500 mPa · s. If it exceeds 800 mPa · s, clogging may easily occur when sprayed, or it may be difficult to apply the coating uniformly and thinly. In addition, when the viscosity is less than 0.1 mPa · s, the viscosity is too low to be applied to a desired thickness, or when an inorganic filler is included, the inorganic filler tends to settle, and the desired inorganic filler ratio is obtained. It becomes difficult to apply.
The viscosity can be measured using a “TVE-25H viscometer” manufactured by Toki Sangyo Co., Ltd. under conditions of a temperature of 25 ° C. and a rotation speed of 100 rpm.

1.4. Other Components The primer according to the present invention (main agent and / or curing agent in the case of a two-component type) may contain a solvent other than alcohol as long as the effects of the present invention are not impaired. The amount is preferably as small as possible. Specifically, the content of solvents other than alcohol is preferably 40% by mass or less. More preferably, it is 20 mass% or less. In the case of the two-pack type, the content of the solvent other than alcohol is preferably 40% by mass or less in both the main agent and the curing agent. More preferably, it is 20 mass% or less. Examples of the solvent other than alcohol include organic solvents such as xylene, toluene, acetone, methyl ethyl ketone, ethyl acetate, and butyl acetate, and water.

  The primer according to the present invention may contain various additives other than the components described above. Since the additive is the same as the conventional one, the description thereof is omitted, but it is preferable that the additive contains an inorganic filler. When inorganic filler is included, the compatibility between the primer and the concrete slab will be even better, and if there are irregularities on the concrete floor slab surface, there will be irregularities derived from fine powder, residual asphalt, cutting treatment, blasting, etc. In this case, the unevenness is reduced by the inorganic filler entering the concave portions, and the adhesion between the concrete floor slab and the waterproof layer described later can be further improved. In addition, it is easy to promote drying of the primer, and there is an advantage that it can be cured in a shorter time. Furthermore, when an inorganic filler fills a recessed part, when a waterproof layer is constructed, since the effect which suppresses generation | occurrence | production of the pinhole of a waterproof layer becomes higher, it is preferable.

There is no restriction | limiting in particular as an inorganic filler, Any forms, such as a fibrous form, plate shape, a granular form, a powder form, an amorphous form, may be sufficient.
When it is fibrous, it may be inorganic or organic. For example, glass fibers, carbon fibers, silica / alumina fibers, zirconia fibers, boron fibers, boron nitride fibers, silicon nitride potassium titanate fibers, metal fibers, wollastonite and other inorganic fibers, fluororesin fibers, aramid fibers, vinylon fibers Organic fibers such as
In the case of a plate shape, glass flakes, talc, mica, mica, kaolin and the like can be mentioned.
Other inorganic fillers in granular, powder or amorphous form include cement, calcium carbonate, barium carbonate, magnesium carbonate, calcium silicate, silica, zirconium silicate, hydrotalcite, asbestos, clay, zeolite, potassium titanate, Examples thereof include barium sulfate, calcium sulfate, calcium oxide, titanium oxide, silicon oxide, aluminum oxide, zinc oxide, calcium titanate, magnesium titanate, barium titanate, and magnesium hydroxide. Among these, cement is more preferable.

The type of cement is not particularly limited, and may be any of Portland cement, mixed cement, special cement, and ecocement such as ordinary cement and fast-hardening ecocement, but Portland cement is preferable.
Examples of Portland cement include ordinary Portland cement, early-strength Portland cement, ultra-early strong Portland cement, moderately hot Portland cement, low heat Portland cement, sulfate-resistant Portland cement, and the like.
Examples of the mixed cement include blast furnace cement (type A, type B, type C), fly ash cement (type A, type B, type C), silica cement (type A, type B, type C) and the like.
Examples of the special cement include a type in which various properties are added based on Portland cement, such as expansive cement, low heat generation cement, white Portland cement, alumina cement, and fine particle cement. Among these, ordinary Portland cement is preferable.

  The inorganic fillers may be used alone or in combination of two or more at any ratio. Moreover, the surface treatment may be performed as needed.

  The content of the inorganic filler in the primer is preferably 1% by mass or more, more preferably 5% by mass or more, and further preferably 10% by mass or more. Moreover, it is preferable that it is 50 mass% or less, It is more preferable that it is 40 mass% or less, It is further more preferable that it is 30 mass% or less. If the content is less than 1% by mass, the adhesion to the concrete slab may be reduced, or the primer curing rate may be reduced. On the other hand, if it exceeds 50% by mass, the primer becomes difficult to be cured or becomes brittle, and the cohesive fracture force tends to decrease and the adhesive strength tends to decrease.

  Moreover, it is preferable that the primer which concerns on this invention contains colorants, such as dye and a pigment. By including a coloring agent, it is preferable to include an inorganic filler, and more preferably in combination with cement, so that it becomes easier to distinguish between the pre-primer application part and the applied part, and the workability is further improved. There are advantages.

  As described above, by using an epoxy-based primer containing a predetermined amount of alcohol as a solvent, it can be cured in a short time even when applied to the concrete floor slab surface where fine powder and asphalt components remain, and after curing It can be firmly fixed to a concrete slab.

2. Construction method of floor slab waterproof structure The primer according to the present invention can be widely used as a primer for floor slab waterproof structure. Hereinafter, a method for constructing a floor slab waterproof structure using the primer will be described.

2.1. First Embodiment As shown in FIGS. 1 and 2, the floor slab waterproofing construction method (Method S10) according to the first embodiment is the primer layer obtained by applying the above-described epoxy primer to the upper surface of the concrete floor slab 1. 2 ′, the first step (S1), the primer layer 2 ′ is dried and cured, the second step (S2), and the waterproof layer 3 is formed on the dried and cured primer layer 2. And a third step (S3).

2.1.1. First step (S1)
As shown in FIGS. 1 and 2A, S1 is a step of forming the primer layer 2 ′ by applying the above-described epoxy-based primer to the upper surface of the concrete floor slab 1. When the primer is a two-component type, a mixture obtained by mixing the main agent and the curing agent is applied to the upper surface of the concrete floor slab 1. As a method for applying the primer to the upper surface of the concrete floor slab 1, any conventional method can be applied. For example, it can apply | coat by spraying a primer on the upper surface of the concrete floor slab 1, or hand-coating. As described above, since the viscosity of the primer according to the present invention is sufficiently reduced by alcohol, a known construction device such as a roller, a roller brush, a rubber rake or the like can be easily sprayed on concrete using a known device. By using it, it can be hand-painted.
The thickness (application amount) of the primer layer 2 ′ is not particularly limited. Depending on the concentration of the primer according to the present invention, for example, it is preferable to 0.02 kg / ^{m 2} or more 1 kg / ^{m 2} or less coating amount. More preferably, 0.05 kg / ^{m 2} or more 0.8 kg / ^{m 2} or less, 0.08 kg / ^{m 2} or more 0.5 kg / ^{m 2} or less. If the coating amount is less than 0.02 kg / m ² , the adhesiveness to the concrete floor slab may be lowered, or it may be difficult to apply uniformly. If the coating amount exceeds 1 kg / m ² , it may be difficult to shorten the drying time. For example, it may be difficult to dry within 23 minutes at 15 ° C., preferably within 10 minutes.

  In the method S10, S1 can be performed while the asphalt component 52 (see FIG. 6) remains on the surface of the concrete slab 1. In the present invention, since an epoxy-based primer containing an alcohol as a solvent is used, repelling and dissolution on the asphalt residue can be suppressed, and in the following second step, the primer can be cured in a short time, After curing, it can be firmly fixed to the concrete slab. As a form of performing S10 in a state where the asphalt component 52 remains on the surface of the concrete slab 1, there is a case of repairing a road. Details will be described later.

2.1.2. Second step (S2)
As shown in FIGS. 1 and 2B, S2 is a step of drying and curing the primer layer 2 ′. As described above, the primer according to the present invention contains alcohol as a solvent. Since the liquid alcohol has high volatility, the primer layer 2 'is dried in a short time in S2. On the other hand, the primer which concerns on this invention hardens | cures when an epoxy resin reacts with a hardening | curing agent as above-mentioned. Heating may be performed during drying and curing. Although heating temperature is not specifically limited, 20 degreeC or more and 200 degrees C or less are preferable. The drying time and the curing time can be adjusted by the concentration of the epoxy resin and the curing agent. In this invention, the time which a 2nd process requires can be shortened more by using the epoxy-type primer containing alcohol as a solvent, Furthermore, preferably by containing an inorganic filler, especially cement.

Usually, fine powder exists on the surface of the concrete floor slab 1, and there is a possibility that fixing of the primer layer and the concrete floor slab may be hindered by the fine powder. In this respect, since the viscosity of the primer according to the present invention is sufficiently reduced by alcohol as described above, the primer is easily immersed in the fine powder (or while taking in the fine powder), and is applied to the concrete slab 1. In close contact. Furthermore, in the case of containing an inorganic filler, especially cement, the inorganic filler in the primer is dispersed so as to fill the unevenness of the concrete floor slab 1, and the compatibility between the concrete floor slab 1 and the primer is also improved. The adhesiveness of the resin is further improved. In addition, it becomes easy to promote drying of the primer, and it can be cured in a shorter time. Moreover, when a waterproof layer is constructed, the effect of suppressing the generation of pinholes in the waterproof layer is further enhanced. By drying and curing the primer layer 2 ′ in close contact with the concrete floor slab 1 in this way, the dried and cured primer layer 2 (FIG. 2B) is firmly fixed to the concrete floor slab 1. .
The thickness of the primer layer 2 after drying and curing is not particularly limited. For example, the thickness is preferably 1 μm or more and 250 μm or less, and more preferably 30 μm or more and 150 μm or less.

Furthermore, in the present invention, after forming the primer layer 2, it is preferable to apply the primer once again to form the primer layer 2 ′, and to dry it to form the primer layer 2 (FIG. 2 (B ′)). By applying the primer twice in this way, it is possible to suppress the generation of bubbles in the primer layer due to moisture present in the concrete slab 1, thereby facilitating the suppression of pinhole generation in the waterproof layer described later. There is. Further, there is an advantage that it is easy to suppress a decrease in adhesiveness with a waterproof layer described later.
The primer is preferably applied twice, but may be applied three or more times depending on the surface state of the concrete floor slab 1. When the primer is applied twice or more, the primer coating amount may be the above-mentioned preferable range in the total of all the coatings, and the thickness of the primer layer 2 is the total thickness of all the coatings. What is necessary is just to make it become a preferable range.

2.1.3. Third step (S3)
S3 is a step of forming the waterproof layer 3 on the upper surface of the dried and cured primer layer 2. Since there is almost no fine powder on the surface of the cured primer layer 2 and the unevenness is reduced, it can be an appropriate surface for forming the waterproof layer 3. In the method S10, the waterproof layer 3 can be firmly fixed to the upper surface of the concrete floor slab 1 through the primer layer 2. As the waterproof layer 3, any known waterproof layer having a floor slab waterproof structure can be applied. Either a form in which a waterproof resin is applied or a form in which a waterproof sheet is laid may be used. In particular, a waterproof layer containing a urethane resin is preferable. As such a waterproof layer, for example, a urethane-based waterproof layer as described in Japanese Patent No. 3956757 can be applied as it is.

The coating amount of the waterproof layer is not particularly limited, but for example, it is preferable to 0.3 kg / ^{m 2} or more 5 kg / ^{m 2} or less coating amount. More preferably, it is 0.5 kg / m ² or more and 4 kg / m ² or less, further preferably 0.7 kg / m ² or more and 3.5 kg / m ² or less, and particularly preferably 1 kg / m ² or more and 3 kg / m ² or less. If the coating amount is less than 0.3 kg / m ² , it may be difficult to apply uniformly, or it may be difficult to block pinholes generated in the waterproof layer, and the waterproof performance may be inferior. On the other hand, when the coating amount exceeds 5 kg / m ² , it is not preferable because the construction time becomes long or the cost becomes high.

  As described above, in the method S10, the floor slab waterproofing structure 10 can be constructed through S1 to S3 (FIG. 2C). Here, in the method S10, the primer according to the present invention is used, and the drying time and curing time of the primer layer 2 'can be shortened. Furthermore, since the influence of fine powder and asphalt components remaining on the surface of the concrete floor slab 1 can be reduced, it is not necessary to completely remove the fine powder and asphalt components from the surface of the concrete floor slab 1. Thus, according to the method S10, the floor slab waterproof structure can be constructed in a shorter time than before.

2.2. Second Embodiment As shown in FIGS. 3 and 4, the floor slab waterproofing construction method (method S20) according to the second embodiment is the primer layer obtained by applying the above-described epoxy primer to the upper surface of the concrete floor slab 1. 2 ′, the first step (S11), the primer layer 2 ′ is dried and cured, the second step (S12), and the adhesive layer 11 is formed on the dried and cured primer layer 2. A third step (S13) and a fourth step (S14) for forming the waterproof layer 3 on the upper surface of the adhesive layer 11 are provided.

  Since S11 and S12 are the same as S1 and S2 described above, description thereof is omitted here. S14 is the same as S3 described above except that the waterproof layer 3 is formed not on the upper surface of the primer layer 2 but on the upper surface of the adhesive layer 11, and thus the description thereof is omitted here. That is, the method S20 can be rephrased as a method in which S13 is provided between S2 and S3 in the method S10 described above.

  As the adhesive constituting the adhesive layer 11, any adhesive that can function as an adhesive for floor slab waterproofing structures can be applied. Depending on the working conditions and the type of the waterproof layer 3, it is preferable to use an adhesive containing a polyamide resin and asphalt, an adhesive containing a urethane resin and asphalt, or an asphalt adhesive. More preferably, it is a polyamide adhesive containing a polyamide resin and asphalt.

  In the present application, the “polyamide resin” contained in the adhesive is a resin containing as a main component a polyamide resin, which is a polymer compound having an amide bond formed by a reaction between an acid and an amine, and is thermoplastic. Means things. “Main component” means 50% by mass or more. Preferably it is 80 mass% or more, More preferably, it is 90 mass% or more, Most preferably, it is 99 mass% or more. Examples of the polyamide resin include n-nylon (nylon 6, nylon 11, etc.), n, m-nylon (nylon 66, nylon 610), dimer acid-based polyamide, para-aramid, meta-aramid, and the like. From the viewpoint of adhesiveness, dimer acid-based polyamide is preferred.

  The polyamide-based resin may have a polymer unit other than polyamide as long as the effects of the present invention are not impaired, or may be a mixed resin with a resin other than polyamide. The content of polymer units other than polyamide or resins other than polyamide in the polyamide-based resin is 50% by mass or less, preferably 10% by mass or less, more preferably 1% by mass or less.

It is preferable to use a polyamide-based resin having an amine value of 5 mgKOH / g or more. By using a polyamide-based resin having an amine value of 5 mgKOH / g or more, the waterproof layer 3 can be more firmly bonded to the adhesive layer 11. The amine value is preferably 7 mgKOH / g or more, more preferably 10 mgKOH / g or more. The upper limit of the amine value is not particularly limited. According to the knowledge of the present inventors, a predetermined adhesive strength can be ensured even with a polyamide-based resin having an amine value of 65 mgKOH / g. However, if the amine value is too high, the molecular weight becomes low, the coating film elongation after solidification decreases, and the cohesive failure force may decrease. From this viewpoint, the amine value of the polyamide-based resin is preferably 60 mgKOH / g or less.
The amine value is defined by the mass of calcium hydroxide (KOH) equivalent to perchloric acid necessary for neutralizing all basic components contained in the molecule per unit mass. . The amine value is determined, for example, by dissolving 3 g of a polyamide resin sample in m-cresol, titrating with a perchloric acid methanol solution by potentiometric titration, and converting to mg of KOH.

  Adjustment of the amine value of the polyamide resin is carried out by adjusting the charging ratio of the dicarboxylic acid and the diamine, or by reacting the polyamide resin obtained by polymerization with a terminal adjusting agent such as amine. Can be done. As the amine used as a terminal adjuster, those having 6 to 22 carbon atoms are preferable, for example, aliphatic such as hexylamine, octylamine, decylamine, laurylamine, myristylamine, palmitylamine, stearylamine, and behenylamine. Primary amines are mentioned.

  Also, dimer acid is preferably used for adjusting the amine value. As is well known, dimer acid is a dimerization of unsaturated fatty acids such as oleic acid, linoleic acid, erucic acid, etc., one of which is a dibasic acid having 36 carbon atoms and / or a hydrogenated product thereof. And a small amount of a monobasic acid (monomer) having 18 carbon atoms and a tribasic acid (trimer) having 54 carbon atoms.

  Any polyamide-based resin may be used as long as it is solid at room temperature (25 ° C.) and can be melted by heating. In particular, the polyamide-based resin preferably has a melt viscosity at 160 to 200 ° C. of 100 mPa · s or more and 100,000 mPa · s or less.

  Specific examples of “asphalt” include straight asphalt, blown asphalt, semi-blown asphalt, solvent-removed asphalt, and modified asphalt. From the viewpoint of availability and workability, straight asphalt is preferable. In particular, the penetration (1/10 mm) at 25 ° C. specified in accordance with JIS K2207 is preferably 40 or more and 120 or less. The penetration is more preferably 60 or more, and more preferably 100 or less. The softening point and elongation (15 ° C., JIS K2207) of asphalt depend on the above penetration. For example, the softening point is preferably 35 ° C. or higher, and preferably 60 ° C. or lower. In the present invention, by using straight asphalt having such penetration, the adhesive strength can be further improved, and stickiness after cooling and solidification can be more appropriately eliminated.

  When a polyamide-based adhesive containing a polyamide-based resin and asphalt is used, the polyamide-based resin is 45% by mass to 99% by mass, and the asphalt is 1% by mass to 55%, based on the entire adhesive (100% by mass). It is preferable to contain it by mass% or less. The content of the polyamide-based resin is preferably 50% by mass or more, and preferably 95% by mass or less. The asphalt content is preferably 5% by mass or more, and preferably 50% by mass or less. By setting the mass ratio of the polyamide-based resin and the asphalt within such a range, the adhesive material has less surface stickiness, and the adhesive strength with the remaining asphalt becomes more excellent. In addition, the waterproof layer 3 can be more firmly bonded to the adhesive layer 11.

  In addition, the polyamide-based adhesive containing the polyamide-based resin and asphalt may further contain a thermoplastic resin other than the polyamide-based resin in order to improve compatibility and improve surface tack. Examples of the thermoplastic resin include styrene ethylene butylene styrene block copolymer (SEBS), styrene butadiene block copolymer (SBS), styrene butadiene rubber (SBR), styrene butadiene butylene styrene block copolymer (SBBS), and styrene. Styrene elastomer selected from ethylene propylene styrene block copolymer (SEPS); polyethylene (PE), ethylene vinyl acetate copolymer (EVA), ethylene propylene rubber (EPM), ethylene propylene diene rubber (EPDM), ethylene acrylic An ethylene elastomer selected from an acid methyl block copolymer (EMA) and an ethylene ethyl acrylate block copolymer (EEA); polypropylene (PP); thermoplastic polyurethane (TPU), etc. It can Mashiku example. Of these, styrene-based elastomers are preferable. The content of the thermoplastic resin other than the polyamide-based resin is preferably 1 to 30 parts by mass, more preferably 2 to 20 parts by mass, and 3 to 15 parts by mass with respect to the total amount (100 parts by mass) of asphalt and polyamide. Is more preferable. The thickness of the adhesive layer 11 is not particularly limited. For example, the thickness is preferably 0.1 mm or more and 2.0 mm or less.

  In the present application, the “urethane resin” contained in the adhesive is a resin containing at least one of a urea resin, a urethane resin, and a urea urethane resin. The same applies to the urethane-based resin contained in the waterproof layer and the binder layer described later.

  As described above, in the method S20, the floor slab waterproofing structure 20 can be constructed through S11 to S14. Here, in the method S20, the primer according to the present invention is used, and the drying time and curing time of the primer layer 2 'can be shortened. Furthermore, since the influence of fine powder and asphalt components remaining on the surface of the concrete floor slab 1 can be reduced, it is not necessary to completely remove the fine powder and asphalt components from the surface of the concrete floor slab 1. Thus, according to the method S20, the floor slab waterproof structure can be constructed in a shorter time than conventional.

3. Application example of construction method of floor slab waterproof structure (construction method of floor slab waterproof structure)
An application example of the construction method of the floor slab waterproof structure will be described. As described above, in the methods S10 and S20, it is possible to perform S1 and S11 with the fine powder and asphalt components remaining on the surface of the concrete floor slab 1. Hereinafter, a construction method (S100) of a floor slab waterproof structure in road repair will be described as an application example of the method S10 with reference to FIGS.

  As shown in FIGS. 5 and 6, when repairing the road, first, a step (S 0) of peeling the pavement 51 including the asphalt component provided above the concrete floor slab 1 and exposing the concrete floor slab 1 is performed. After that, by performing S1 to S3 sequentially while leaving a part or all of the asphalt component (preferably a part of the asphalt component, asphalt component 52 in FIG. 6) on the surface of the concrete floor slab 1, Install a floor slab waterproof structure. Thereafter, the road repair is completed through a step (S4) of installing the pavement 53 on the upper surface of the waterproof layer 3 via the pavement adhesive layer 54 (binder layer and / or adhesive layer) or the like.

3.1. Step of exposing the concrete floor slab 1 (S0)
As shown in FIG. 6A, the pavement 51 is provided above the concrete floor slab 1 through an adhesive layer, an optional waterproof layer, or the like. In S0, such a pavement 51 is peeled off from the surface of the concrete floor slab 1 together with an adhesive layer or the like to expose the concrete floor slab 1. For example, by using a cutting machine, a backhoe, a water jet, a shot blast, etc., the pavement 51 can be easily peeled from the concrete floor slab 1 and the surface of the concrete floor slab 1 can be exposed. However, completely removing the asphalt component derived from the paving body 51 from the surface of the concrete slab 1 requires considerable labor, labor, and time, and is not practical. Therefore, as shown in FIG. 6 (B), the surface of the concrete floor slab 1 remains in a state where the concrete grinding fine powder (not shown) and the asphalt component 52 remain.

3.2. S1-S3
As described above, S10 can be performed even if the fine powder and the asphalt component 52 remain on the surface of the concrete floor slab 1. That is, by using an epoxy-based primer containing alcohol as a solvent, the primer layer 2 can be firmly fixed to the concrete slab 1 in a short time regardless of the presence of fine powder or asphalt component 52, and then waterproof. Layer 3 can be installed properly.

3.3. Step of installing the paving body 53 (S4)
S4 is a step of installing the pavement 53 on the upper surface of the waterproof layer 3 formed through S10, preferably via the pavement adhesive layer 54 or the like. As the pavement 53, for example, a known asphalt pavement can be applied. The pavement adhesive layer 54 that bonds the pavement 53 and the waterproof layer 3 is not particularly limited.
For example, when a thermoplastic resin or a thermoplastic sheet is used as the pavement adhesive layer 54, an adhesive binder is applied to the surface of the waterproof layer 3, and then a thermoplastic resin or sheet is disposed, and the heat of the heated pavement 53 is used. While the thermoplastic resin or sheet is softened and melted, the thermoplastic resin or sheet and the pavement 53 are brought into close contact with each other, and then cooled, so that the pavement 53 is placed on the surface of the waterproof layer 3 via the thermoplastic resin or sheet. It can be installed with sufficient strength. Alternatively, instead of the thermoplastic resin or the thermoplastic sheet, after applying an adhesive binder, the pavement adhesive layer 54 can be configured using an adhesive such as silica sand or modified asphalt. In the present invention, the pavement adhesive layer 54 is preferably composed of a binder layer and / or an adhesive layer. Specifically, a fourth step of forming a binder layer on the upper surface of the waterproof layer 3 of the constructed floor slab waterproof structure, a fifth step of drying and curing the binder layer, and an upper surface of the dried and cured binder layer A pavement adhesive layer 54 composed of a binder layer, a silica sand layer, and an adhesive layer is formed on the upper surface of the waterproof layer 3 through the sixth step of forming an adhesive layer on the waterproof layer 3, and an asphalt pavement is applied on the pavement 53. Install. More preferably, the fourth step of forming a binder layer on the upper surface of the waterproof layer 3 of the constructed floor slab waterproof structure, the fifth step of drying and curing the binder layer after spraying silica sand on the binder layer, and drying Then, through a sixth step of forming an adhesive layer on the upper surface of the cured binder layer, a pavement adhesive layer 54 composed of a binder layer, a silica sand layer, and an adhesive layer is formed on the upper surface of the waterproof layer 3, and an asphalt is formed thereon. The pavement 53 is installed by pavement.

3.3.1. Binder layer In the present invention, since the construction time of the floor slab waterproof structure can be shortened and the adhesiveness with the waterproof layer 3 becomes better, the binder curing time is applied as the binder applied to the surface of the waterproof layer 3. However, if a material having a length of 50 minutes or less, 40 minutes or less, particularly 30 minutes or less is used, the construction time can be greatly reduced.
The curing time can be adjusted by a conventionally known method. For example, in the case of a two-component type of a main agent and a curing agent, the mixing ratio thereof is adjusted, or the amount of catalyst added at the time of mixing is adjusted. Or by adjusting the temperature at the time of mixing, and the method of adjusting the amount of catalyst is particularly preferable.
There is no restriction | limiting in particular in the kind of binder, What is necessary is just to select suitably according to the kind of waterproof layer 3. FIG. For example, when the waterproof layer includes a urethane resin, the binder is preferably a urethane resin.

The coating amount of the binder is not particularly limited, but for example, it is preferable to 0.01 kg / ^{m 2} or more 2 kg / ^{m 2} or less coating amount. More preferably 0.05 kg / ^{m 2} or more 1.5 kg / ^{m 2} or less, more preferably 0.08 kg / ^{m 2} or more 1 kg / ^{m 2} or less, particularly preferably 0.1 kg / ^{m 2} or more 0.7 kg / ^{m 2} It is as follows. If the coating amount is less than 0.01 kg / m ² , poor adhesion between the waterproof layer 3 and the pavement 53 is likely to occur, and the long-term durability may be reduced, or it may be difficult to apply uniformly. There is a case. On the other hand, if the coating amount exceeds ² kg / m ² , there may be a problem that a necessary amount of silica sand to be described later increases, or that hardening starts during the coating of the binder. Further, it is not preferable because the construction time becomes long and the cost becomes high.

3.3.2. Silica Sand Layer Furthermore, it is preferable to spread silica sand on the surface of the binder layer before the applied binder is completely cured. As a result, the dispersed silica sand is held and fixed after the binder layer is cured, and thereafter, the adhesion with the adhesive layer and / or the pavement 53 applied to the upper surface becomes better, and fatigue durability is improved. There is an advantage of improvement.
Further, even if the binder is not completely cured, the surface of the binder is covered with silica sand, so that people and vehicles can pass and work, and the construction time can be shortened. The dispersed silica sand is preferably held in the binder layer, but it is not necessary that all of the silica sand is held in the binder layer, and there may be a silica sand layer not held in the binder layer. .

  As the silica sand to be spread on the binder layer, those having a particle diameter of 0.05 to 2.5 mm are preferable, those having a particle diameter of 0.1 to 2 mm are more preferable, those having a particle diameter of 0.2 to 1.5 mm can be more preferably used, Silica sand No. 3 (particle diameter 1.2-2.4 mm), silica sand No. 4 (particle diameter 0.6-1.2 mm) or quartz sand No. 5 (particle diameter 0.3-0.8 mm), etc. Is less scattered. Silica sand improves tensile adhesion and shear adhesion between the binder layer and, if necessary, the adhesive layer applied thereon. Therefore, when the particle diameter is less than 0.05 mm, these adhesive strengths are lowered, and the adhesiveness between the waterproof layer 3 and the pavement 53 is likely to be reduced. On the other hand, if the particle diameter exceeds 2.5 mm, there are many portions that are not taken into the binder layer, which may hinder adhesion with the pavement 53. Moreover, since the amount of binder required for holding the silica sand not fixed to the binder layer increases, it may lead to a decrease in dryness, workability, and cost, which is not preferable.

  Silica sand is made of natural quartz sand, which has been collected in natural quartz sand, washed with water, dried and sieved, artificial quartz sand and rock-like quartz sand, and artificially ground silica sand and glass crushed products. Etc., but can be selected based on cost and availability. However, in order to prevent scattering at the time of spraying, it is preferable to use a product that has been preliminarily sieved and manufactured by a manufacturer. These silica sands can be used alone or in combination of two or more.

The amount of silica sand sprayed is preferably adjusted as appropriate depending on the particle diameter. For example, when silica sand No. 5 is used, it is preferably 0.3-2 kg / m ² , 0.5-1.6 kg. / more preferably ^m is ^2, and more preferably a 0.7～1.3Kg / ^{m 2.} If the amount applied is small, the adhesiveness is likely to deteriorate, and if too large, there is a possibility that the adhesiveness may be reduced due to the presence of a large amount of silica sand that does not adhere to the binder layer.

3.3.3. Adhesive layer In order to further improve the adhesion between the paved body 53 and the waterproof layer 3, it is preferable to form an adhesive layer after the silica sand is dispersed. As the adhesive used for the adhesive layer, any one that can function as an adhesive for floor slab waterproofing structures can be applied. Although it depends on the working conditions and the type of the waterproof layer 3, it is preferable to use an asphalt adhesive in the present invention. Specifically, those containing asphalt and a thermoplastic resin are preferable, and those containing 30% by mass to 90% by mass of asphalt and 10% by mass to 70% by mass of thermoplastic resin are more preferable.

  Although there is no restriction | limiting in particular as asphalt, The thing similar to the asphalt contained in the polyamide-type contact bonding layer formed as needed between the above-mentioned primer layer 2 and the waterproofing layer 3 can be used. Asphalt may be used alone or in combination of two or more.

  The thermoplastic resin is not particularly limited. For example, polyolefin resin such as polyethylene and polypropylene, styrene resin such as ABS resin and AS resin, elastomer such as styrene, ethylene and polyurethane, vinyl chloride resin, polyamide resin and polyester. Examples include resins, methacrylic resins, polycarbonate resins, polyacetal resins, vinylidene chloride resins, polybutene resins, polyurethane resins, and the like. Of these, petroleum resins, elastomers, and polyurethane resins are preferable.

The petroleum resin may be used a material obtained by polymerizing an unsaturated compound component contained in the decomposed oil fraction upon decomposition of naphtha, aliphatic petroleum resins which the C ₅ fraction as a raw material, C ₉ fraction And C ₅ C ₉ copolymer petroleum resin using both C ₅ fraction and C ₉ fraction as raw materials. These petroleum resins may be used alone or in combination of two or more.

As the aliphatic petroleum resin, those having a copolymer component such as isoprene, piperylene, 2-methylbutene can be used, and the conjugated diolefin component may have a cyclized structure. It is preferable to use a softening point of 70 to 110 ° C. and a molecular weight of 800 to 2000.
As an aromatic petroleum resin, what has copolymerization components, such as styrene, vinyl toluene, (alpha) -methylstyrene, and indene, can be used. It is preferable to use a softening point of 80 to 150 ° C. and a molecular weight of 600 to 3500.
As the C ₅ C ₉ copolymer petroleum resin, it is preferable to use one having a softening point of 60 to 150 ° C. and a molecular weight of 600 to 3500.

  In particular, it is also preferable to use a petroleum resin having a hydroxyl group in the molecule from the viewpoint of improving the adhesion with the binder layer. This hydroxyl group can be introduced into the molecule by adding a compound having a hydroxyl group such as phenol during the production of a petroleum resin, for example, during polymerization. The hydroxyl group content in the petroleum resin is preferably a hydroxyl value of 10 mgKOH / g or more, more preferably 20 mgKOH / g or more, further preferably 50 mgKOH / g or more, preferably 100 mgKOH / g or less, more preferably 90 mgKOH / g or less. . If the hydroxyl value is too low, the desired effect of improving adhesiveness may not be obtained. Conversely, if the hydroxyl value is too high, the production cost tends to increase.

  As the elastomer, for example, styrene ethylene butylene styrene block copolymer (SEBS), styrene butadiene block copolymer (SBS), styrene butadiene rubber (SBR), styrene butadiene from the viewpoint of asphalt modification effects such as temperature sensitivity. Styrene elastomer selected from butylene styrene block copolymer (SBBS) and styrene ethylene propylene styrene block copolymer (SEPS); polyethylene (PE), ethylene vinyl acetate copolymer (EVA), ethylene propylene rubber (EPM) Ethylene-based elastomer selected from ethylene propylene diene rubber (EPDM), ethylene methyl acrylate block copolymer (EMA), ethylene ethyl acrylate block copolymer (EEA); polyurethane (TP ) And the like can be preferably exemplified. Of these, styrene-based elastomers are preferable, and SEBS is more preferable. You may use these 1 type or in mixture of 2 or more types.

  The content of asphalt in the asphalt-based adhesive is preferably 30% by mass or more and 90% by mass or less, and more preferably 40% by mass or more and 80% by mass or less. The content of the thermoplastic resin is preferably 10% by mass or more and 70% by mass or less, and more preferably 20 to 60% by mass or less.

  If the asphalt content is less than 30% by mass, the viscosity of the asphalt-based adhesive when heated and melted becomes too high, so that it is difficult to apply uniformly during construction and workability tends to be reduced. Adhesiveness may decrease. On the other hand, if the content exceeds 90% by mass, the asphalt-based adhesive is likely to flow when the operating environment temperature is high. May occur and long-term durability may be reduced.

  If the content of the thermoplastic resin exceeds 70% by mass, the viscosity of the asphalt-based adhesive when heated and melted becomes too high, making it difficult to apply evenly during construction and reducing workability. Adhesiveness with 53 may deteriorate. On the other hand, if the content is less than 10% by mass, the effect of improving the temperature sensitivity of asphalt, that is, the property of being brittle at low temperature and having high fluidity at high temperature is insufficient, so that it is easily affected by temperature changes and is durable. May decrease.

The methods for applying the binder and the adhesive are generally methods such as roller brush coating, brush coating, flow coating using a register mark, and spray coating using airless spray, but are not limited to these methods. The number of times of application may be adjusted as necessary to obtain the desired adhesiveness.
There is no particular limitation on the method of spraying the silica sand, and a conventionally known method such as spraying using a blower may be employed.

The application amount of the adhesive is not particularly limited, but for example, the application amount is preferably 0.1 kg / m ² or more and 3 kg / m ² or less. More preferably, 0.3 kg / ^{m 2} or more 2 kg / ^{m 2} or less, 0.5 kg / ^{m 2} or more 1.5 kg / ^{m 2} or less. If the coating amount is less than 0.1 kg / m ² , poor adhesion between the waterproof layer 3 and the pavement 53 is likely to occur, and long-term durability may be reduced, or uniform coating may be difficult. There is a case. On the other hand, if the coating amount exceeds 3 kg / m ² , it is not preferable because the construction time becomes long and the cost tends to increase.

In the present invention, by adopting the above preferred configuration, it is possible to significantly shorten the construction time from the step S1 for forming the primer to the step before installation of the paving body 53 described later. The construction time is preferably shorter, but in the aspect of the present invention, for example, the area of 300 m ² is within 6 hours, further within 5 hours, and particularly when the more preferable aspect is adopted, it is as short as 4 hours. The construction method can be completed in work time, and the construction method of the present invention is suitably employed particularly when repairing a road.

3.3.4. After applying the above binder layer and / or adhesive layer, the pavement, preferably an asphalt pavement, is laid out by an asphalt finisher or the like at a temperature suitable for the pavement, for example, a temperature of 140 to 200 ° C. Then, the pavement 53 is installed by rolling with an iron wheel roller, chemical resistant roller or the like. Due to this thermal compaction, the heat of the pavement 53 is transmitted to the waterproof layer 3, the binder and / or adhesive on the waterproof layer 3 is melted, and the pavement 53 and the waterproof layer 3 are bonded and firmly bonded. Is done. By this construction method, a floor slab waterproofing structure 100 (paved road 100) firmly bonded from the concrete floor slab 1 to the pavement 53 is provided.

As described above, the road can be repaired in a short time by applying the method S10. In the paved road 100 after repair, the waterproof layer 3 is firmly fixed to the concrete floor slab 1 via the primer layer 2 in the floor slab waterproof structure, and exhibits excellent durability and weather resistance.
Note that the application example of the method S10 is not limited to road repair, but can also be applied to the case where an asphalt component remains in waterproof repair after removing an existing asphalt waterproof layer. Alternatively, the present invention can also be applied to a case where a floor slab waterproof structure is constructed on the upper surface of a concrete floor slab. For example, the method S10 can be applied even when a concrete floor slab is newly installed and a floor slab waterproof structure is newly formed thereon. Furthermore, the method S10 can also be applied when a waterproof layer is newly provided on the rooftop concrete of a building such as a reinforced concrete structure. This is because at least fine powder is present on the surface of the concrete slab, and there is an actual benefit of using the primer according to the present invention. However, from the viewpoint of the effects of the present invention becoming more prominent, as an application example of the method S10, it is preferable to apply the floor slab waterproof structure with the asphalt component and fine powder remaining on the surface of the concrete floor slab.

  In the above description, the method of constructing the floor slab waterproof structure 100 by applying the method S10 is exemplified, but the construction method of the floor slab waterproof structure is not limited thereto. The floor slab waterproof structure may be constructed by applying the method S20. For example, after the floor slab waterproof structure 20 is constructed by the method S20, the paved road can be constructed as the floor slab waterproof structure by installing the pavement 53 by the above-described method above the waterproof layer 3. .

  Hereinafter, the remarkable effect produced by the epoxy primer according to the present invention will be described in more detail with reference to examples.

  The following evaluation was performed by preparing a two-pack type epoxy primer, a binder, and an adhesive composed of a main agent and a curing agent having the compositions shown in Tables 1 and 2 below. All evaluations were performed in an atmosphere of 23 ° C./50% RH.

In addition, the detail of the used raw material is as follows.
Epoxy resin: bisphenol A type epoxy resin, manufactured by Mitsui Chemicals, "Epomic R140 (epoxy equivalent 189)"
-Amine: 1,3-bisaminomethylcyclohexane, manufactured by Mitsubishi Gas Chemical Company, "1,3BAC (active hydrogen equivalent 35.5)"
Cement: Normal Portland cement, Taiheiyo Cement Co., Ltd. Polyamide (A): Thermoplastic polyamide resin, Henkel Japan Co., “13U-003”, amine value 15 mg KOH / g, melt viscosity at 200 ° C. 2400 mPa · s
Polyamide (B): Thermoplastic polyamide resin, manufactured by Henkel Japan, “PA6030”, amine value 1.8 mgKOH / g, melt viscosity at 160 ° C. 2400 mPa · s

<Viscosity after primer mixing>
The viscosity after primer mixing was measured using a “TVE-25H viscometer” manufactured by Toki Sangyo Co., Ltd. under the conditions of 25 ° C. and a rotation speed of 100 rpm. In Comparative Examples 2 and 4, since measurement at a rotational speed of 100 rpm was difficult, Comparative Example 2 was measured at a rotational speed of 10 rpm, and Comparative Example 4 was measured at a rotational speed of 5 rpm.

<Evaluation of waterproof slab structure>
Examples 1 to 4, Comparative Examples 1 and 2:
The surface of a concrete plate (300 mm x 300 mm x 60 mm) is treated with steel shot blasting, and after cutting off the chips with a blower, straight asphalt melted at 200 ° C is applied to the other side to a coating amount of 0.15 kg / m ² And applied to a concrete floor slab. Next, after mixing the above-mentioned two-component epoxy primer, the primer was applied onto the entire surface of the concrete floor slab with a roller so that the coating amount was 0.12 kg / m ² . Ten minutes later, the above-mentioned adhesive heated to 200 ° C. was applied to the surface of the primer with a metal spatula so that the application amount was 1.0 kg / m ² . Ten minutes later, a two-component urethane waterproofing material (Mitsubishi Resin Infratec Co., Ltd., “Novaretane ES”) is applied to the entire surface of the adhesive, and a spray gun (Gasmer Co., Ltd., two-component mixing sprayer, Gasmer 20 / 35Pro). And sprayed at a coating amount of 1.5 kg / m ² . After curing for 3 days, cut from the surface of the urethane waterproof layer to the concrete floor slab surface to a width of 20mm with a cutter, grab the edge only with a spring, perform a peel test at an angle of 135 °, measure the peel strength and break the situation Was observed. In FIG. 7, the schematic of the floor slab waterproofing structure used for evaluation is shown. FIG. 7A is a side view and FIG. 7C is a plan view.

Example 5:
Evaluation was performed in the same manner as in Example 1 except that 40 parts by mass of cement was mixed in the primer and no adhesive was applied.

Example 6:
Evaluation was performed in the same manner as in Example 2 except that 40 parts by mass of cement was mixed in the primer and no adhesive was applied.

Example 7:
Evaluation was performed in the same manner as in Example 3 except that 40 parts by mass of cement was mixed in the primer and no adhesive was applied.

Comparative Example 3:
Evaluation was performed in the same manner as in Comparative Example 1 except that 40 parts by mass of cement was mixed in the primer and no adhesive was applied.

Comparative Example 4:
Evaluation was performed in the same manner as in Comparative Example 2 except that 40 parts by mass of cement was mixed in the primer and no adhesive was applied.

  In Examples 5 to 7 and Comparative Examples 3 and 4, FIG. 7B is a schematic side view of a floor slab waterproof structure used for evaluation, and FIG. 7C is a plan view.

<Evaluation criteria 1: Peel strength>
In the peel test described above, the case where the peel strength exceeded 4 kgf / 20 mm was rated as “◯”, the case where the strength was less than 4 kgf / 20 mm, and the case where the interface was broken was rated as “X”. The results are shown in Table 1 below. In Table 1, “peel strength (1)” indicates the peel strength between the concrete floor slab and the primer layer and the adhesive layer (Examples 1 to 4), and the peel strength between the concrete floor slab and the primer layer (Example). 5-7), "Peel strength (2)" is the peel strength between the concrete floor slab with the asphalt remaining on the surface, the primer layer and the adhesive layer (Examples 1 to 4), and the asphalt remained on the surface The peel strength between the concrete slab and the primer layer (Examples 5 to 7) is shown. "Peel strength (3)" is the peel strength between the adhesive layer and the waterproof layer (Examples 1 to 4), primer. The peel strength (Examples 5-7) between a layer and a waterproofing layer is shown.

<Evaluation criteria 2: Evaluation of surface stickiness of primer>
Ten minutes after applying the primer, stickiness was confirmed by finger touch. A non-sticky sample was marked with ◯, and a sticky sample was marked with ×. The results are shown in Table 1 below.

<Evaluation criteria 3: Evaluation of adhesive surface stickiness>
Ten minutes after applying the adhesive, stickiness was confirmed by finger touch. A non-sticky sample was marked with ◯, and a sticky sample was marked with ×. The results are shown in Table 1 below.

  As is apparent from the results shown in Table 1, Examples 1 to 7 using alcohol as a solvent in the epoxy primer are superior in peel strength (2) compared to Comparative Examples 1 and 3 using xylene as a solvent. The primer was excellent and the surface of the primer was not sticky. In Comparative Examples 1 and 3, by applying a primer containing xylene to the concrete floor slab in which the asphalt component remains, the adhesive strength of the primer is reduced due to the repelling and dissolution (cutback) of xylene on the asphalt residue. At the same time, it is considered that a long time was required for drying and curing of the primer due to dissolution of asphalt. On the other hand, in Examples 1 to 7, by using alcohol as the solvent constituting the primer, the solvent repelling and dissolution on the asphalt residue can be suppressed, and the primer can be cured in a short time. It is thought that after hardening, it was firmly fixed to the concrete slab.

  In addition, as is clear from the results of Comparative Examples 2 and 4, when an epoxy-based primer containing no solvent was used, the primer layer was firmly fixed to the concrete slab due to the influence of fine powder remaining on the surface of the concrete slab. I couldn't.

<Evaluation of waterproof structure for floor slab>
Example 8:
The primer described in Table 2 was manually coated on the entire surface of the concrete floor slab with a roller brush on the concrete floor slab obtained in the same manner as in Example 1. After curing for 15 minutes, a primer was further applied in the same manner and cured for 15 minutes. The total amount of primer applied was 0.30 kg / m ² . After that, a two-component urethane waterproofing material (manufactured by Mitsubishi Plastics Infratech, “Novaretane ES”) is applied to the entire surface of the primer layer with a spray gun (two-component mixing sprayer, Gasmer 20 / 35Pro, manufactured by Gasmer). Spraying was performed at a coating amount of 1.5 kg / m ² to construct a urethane waterproof layer. After curing for 3 days, apply a urethane binder (manufactured by Mitsubishi Plastics Infrastructure Tech Co., Ltd., “Novaretan TC Binder”) with a metal spatula so that the application amount is 0.25 kg / m ² , and then immediately apply No. 5 to the binder application surface. Silica sand (manufactured by Tohoku Sosa Co., Ltd.) was sprayed in an amount of 1.0 kg / m ² using a blower. After curing for 30 minutes, 1.0 kg / m ^{2 of} asphalt adhesive (manufactured by Mitsubishi Plastics Infratech, “TC compound”) was applied with a metal spatula to form an adhesive layer.
After allowing to cool, crushed stone mastic asphalt using straight asphalt was paved under the conditions of a paving temperature of 140 ° C. and a linear pressure of 30 kg / cm to obtain a waterproof slab structure.

Example 9:
A floor slab waterproof structure was obtained in the same manner as in Example 8 except that the curing time after the construction of the urethane waterproof layer was 10 minutes.

Example 10:
In the same manner as in Example 8, the urethane waterproof layer was applied and cured for 3 days, and then a solvent-based epoxy resin binder (manufactured by Mitsubishi Plastics Infratech Co., Ltd., “Novarane PR-200”) and cement mixture (mass ratio 100: 20) was applied with a roller brush so that the application amount was 0.15 kg / m ² . Subsequently, a polyamide-based adhesive (a mixture of straight asphalt 45% by mass, polyamide resin (Henkel Japan, “13U-003”) 55% by mass and SEBS (Asahi Kasei Chemicals, “Tuftec 1041”) 5% by mass) Was applied with a metal spatula at 1.0 kg / m ² to form an adhesive layer.
Subsequently, asphalt was paved in the same manner as in Example 8 to obtain a floor slab waterproof structure.

<Evaluation criteria 4: Wheel tracking test>
The asphalt pavement waterproofing structure obtained by the above-mentioned method is described in “Handbook of Pavement Survey and Test Method [Part 3] Chapter III Test (June 2007 Japan Road Association)”. According to the test method described, a wheel tracking test was performed under the conditions of a load time of 120 hours, a test temperature of 60 ± 0.5 ° C., and a wheel load of 686 ± 10 N.
For the slab structure after the test, in order to evaluate the performance of the waterproof layer, tensile welding was performed according to the test method described in Appendix-1 of "Road Bridge Floor Slab Waterproof Handbook (March 2007, Japan Road Association)" A test was conducted.
Cut from the floor slab waterproofing structure with a core cutter with a diameter of 10 cm until it reaches the concrete floor slab, and a fixing jig was bonded to the upper surface with an epoxy adhesive and allowed to stand for 6 hours or more at room temperature to cure the adhesive. . The fixing jig for the obtained specimen was placed in an adhesion peel tester (“BA-800D” manufactured by Maruhishi Kagaku Seisakusho Co., Ltd.), and the vertical direction was set at a temperature of 23 ° C. and a loading speed of 0.1 N / mm ^2. A tensile test was conducted. Tensile bond strength "○" what is 0.6 N / mm ² or more, and those less than 0.6 N / mm ² as "×". The results are shown in Table 2 below.

  As shown in Table 2, it was confirmed that the results of the tensile adhesion tests of Examples 8 to 10 conform to the standards of East Japan / Central Japan / West Japan Highway Co., Ltd./Structure Construction Management Guidelines.

  Moreover, as can be seen from the results of Examples 8 and 9, as the pavement adhesive used for bonding the urethane waterproof layer and the asphalt pavement, the combination of the binder and the adhesive of Examples 8 and 9 is used. preferable. With such a combination, it is possible to apply asphalt pavement even after a very short curing time of 10 minutes after applying the urethane waterproof material. The structure had good adhesion and durability enough to pass the wheel tracking test.

  The primer according to the present invention can be suitably used as a primer interposed between a concrete floor slab and an adhesive layer in a floor slab waterproof structure.

10 Floor slab waterproof structure 1 Concrete floor slab 2 'Primer layer (before drying / curing)
2 Primer layer (after drying / curing)
3 Waterproof layer 20 Floor slab waterproof structure 11 Adhesive layer 100 Floor slab waterproof structure (paved road)
51 Pavement 52 Asphalt Component 53 Pavement 54 Pavement Adhesive Layer

Claims (13)

An epoxy primer for floor slab waterproofing structure containing alcohol in an amount of 10% by mass to 95% by mass as a solvent. The epoxy primer for floor slab waterproofing structure according to claim 1, wherein the alcohol is an alcohol having a boiling point of less than 100 ° C. The epoxy primer for floor slab waterproofing structure according to claim 1 or 2, wherein the alcohol has 2 to 4 carbon atoms. It is a two-part primer of a main agent containing an epoxy resin and a curing agent containing a component for curing the epoxy resin,
When the main agent and the curing agent are mixed based on the epoxy equivalent of the epoxy resin and the active hydrogen equivalent of the component that cures the epoxy resin, an alcohol is used as a solvent in the mixture. It is supposed to contain less than mass%,
The epoxy primer for floor slab waterproofing structures according to any one of claims 1 to 3. The epoxy primer for floor slab waterproofing structure according to claim 4, wherein the component for curing the epoxy resin is an amine. The epoxy primer for floor slab waterproofing structure according to any one of claims 1 to 5, wherein the content of a solvent other than the alcohol is 40% by mass or less. Furthermore, the epoxy primer for floor slab waterproofing structures of any one of Claims 1-6 containing 1 to 50 mass% of inorganic fillers. A first step of applying a primer for waterproofing a floor slab according to any one of claims 1 to 7 to an upper surface of a concrete floor slab to form a primer layer;
A second step of drying and curing the primer layer;
A floor slab waterproofing construction method, comprising: a third step of forming a waterproof layer on the top surface of the dried and cured primer layer. The method according to claim 8, wherein the concrete floor slab has an asphalt component on a part or all of a surface thereof, and the first step is performed while the asphalt component remains on the surface of the concrete floor slab. Before the first step, comprising removing the pavement containing the asphalt component provided above the concrete floor slab and exposing the concrete floor slab,
The method according to claim 8 or 9, wherein the first step is performed while the asphalt component remains on part or all of the surface of the concrete floor slab. The method according to any one of claims 8 to 10, wherein the waterproof layer is a urethane waterproof layer. A step of constructing a floor slab waterproof structure by the method according to any one of claims 8 to 11,
A fourth step of forming a binder layer on the top surface of the waterproof layer of the floor slab waterproof structure;
A fifth step of drying and curing the binder layer;
A sixth step of forming an adhesive layer on the top surface of the dried and cured binder layer;
A construction method for a floor slab waterproofing structure, comprising: a seventh step of performing asphalt pavement on the upper surface of the adhesive layer. A step of constructing a floor slab waterproof structure by the method according to any one of claims 8 to 11,
A fourth step of forming a binder layer on the top surface of the waterproof layer of the floor slab waterproof structure;
A fifth step of drying and curing the binder layer after spraying silica sand on the binder layer;
A sixth step of forming an adhesive layer on the top surface of the dried and cured binder layer;
A construction method for a floor slab waterproofing structure, comprising: a seventh step of performing asphalt pavement on the upper surface of the adhesive layer.