JP2002348896A - Waterproof method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waterproof method excellent in adhesion between a synthetic resin waterproofing material and a post-cast material cast on the synthetic resin waterproofing material. SOLUTION: For the waterproof method for casting the post-cast material layer 5 on the synthetic resin waterproofing material of a waterproofing membrane 2, aggregate 3 is spread over the synthetic resin waterproofing material and after a binder coating material as a coated film layer 4 has been applied, the post-cast material layer 5 is cast.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproofing method excellent in adhesion of a post-cast material. More specifically, in underground structures, bridge floor slabs, etc., a so-called waterproofing method, in which a waterproofing material is applied prior to the construction of a pavement material such as a pavement material. .

[0002]

2. Description of the Related Art Waterproofing methods for prior waterproofing of underground structures, bridge floor slabs, etc., have a problem in that the adhesive strength between a synthetic resin waterproofing material and a post-casting material such as concrete, mortar, asphalt, etc. to be cast thereon is insufficient. It was easy enough.

For this reason, conventionally, aggregates such as silica sand are sprayed in a state where the synthetic resin waterproofing material has not been cured, and the synthetic resin waterproofing material is cured after the curing of the synthetic resin waterproofing material in order to increase the bonding strength by the anchor effect of the aggregate spraying. Remove excess aggregate that did not stick,
The method of placing post-cast material is adopted.

Further, as other conventional techniques for solving the problem of adhesive strength, for example, Japanese Patent Application Laid-Open Nos. 9-228318 and 9-21113 disclose granular asphalt, There is disclosed a technique of asphalt pavement after spraying pellets and the like and melting the pellets and the like to enhance the adhesive strength between the waterproof material and the asphalt pavement. Further, Japanese Patent Application Laid-Open No. 7-5431
No. 4 discloses a technique in which thermoplastic pellets are sprayed before the waterproofing material is cured to obtain the same effect. Further, Japanese Patent Application Laid-Open No. 8-92905 discloses a technique of integrating a waterproof material and asphalt pavement using a thermoplastic waterproof sheet.

Further, Japanese Patent Application Laid-Open No. Hei 10-36658 discloses a technique of forming a one-component flame-retardant urethane waterproof layer between concrete layers.

[0006]

SUMMARY OF THE INVENTION Among the above prior arts,
In the method of spraying aggregate such as silica sand in a state where the synthetic resin waterproof material is uncured, removing excess aggregate that did not adhere after curing of the synthetic resin waterproof material, and placing a post-cast material, the synthetic method is used. It is necessary to spray the aggregate in a state where the resin waterproofing material is uncured, which is greatly restricted by the curing time of the synthetic resin waterproofing material.

For example, when the synthetic resin waterproofing material is a urethane resin-based waterproofing material, the following problems are raised. That is,
When the urethane resin-based waterproofing material is a two-liquid spraying type, the initial curing time is as short as about 1 to 30 seconds, and it is necessary to spray the aggregate almost simultaneously with the urethane resin-based waterproofing material. As a result of spraying a lot, there is a problem that a portion where a waterproof layer becomes thin occurs. When the urethane resin-based waterproofing material is a hand-painted type, the initial curing time is about 5 minutes to 24 hours, the time until curing is long, the timing of spraying is too early, and the aggregates settle in the waterproofing material. The problem that the anchor effect cannot be obtained or the timing of spraying is too late to obtain a sufficient adhesive strength between the waterproof material and the aggregate is likely to occur.

Further, in both the two-liquid spraying type and the hand-painted type, if the removal of the excess aggregate not adhered to the urethane resin-based waterproofing material is insufficient, the waterproofing material and the post-implantation are used. There was also a problem that delamination with the material easily occurred.

As described above, in the above-mentioned prior art in which the aggregate is sprayed to have the anchor effect, there is a problem of adjusting the initial curing time of the synthetic resin waterproofing material and the timing of spraying the aggregate. There has been a problem that peeling is likely to occur, and it is difficult to obtain an adhesive strength between the waterproof material and the post-cast material.

On the other hand, JP-A-9-228318, JP-A-9-21113, and JP-A-7-5431 described above.
4, asphalt pavement after spraying granular asphalt, thermoplastic pellets, etc. on a waterproof material, or a waterproof material and asphalt using a thermoplastic waterproof sheet disclosed in JP-A-8-92905. In the technology for integrating pavement, thermoplastic asphalt, resin, etc. are used, so the after-cast material is limited to asphalt pavement material cast at high temperature, and cannot be applied to concrete, mortar, etc. cast at room temperature. . Furthermore, even when casting asphalt, especially when the temperature in winter is low, the thermoplastic resin or the like may not be sufficiently melted, and a sufficient adhesive strength between the waterproofing material and the asphalt may not be obtained. The problem had arisen.

Also, in the method of forming a one-component flame-retardant urethane waterproofing layer between the concrete layers of concrete disclosed in Japanese Patent Application Laid-Open No. 10-36658, the waterproofing performance is poor, but the post-cast concrete has poor adhesion and is waterproof. There is a problem that the layer and the post-cast concrete peel off, and if the waterproof layer leaks due to a defect, the leaked water will flow around the entire layer between the waterproof layer and the post-cast concrete. There were problems that were difficult and time-consuming to repair.

Accordingly, an object of the present invention is to solve the above-mentioned problems of the prior art, and to provide a waterproofing method excellent in adhesion between a synthetic resin waterproof material and a post-cast material cast on the synthetic resin waterproof material. It is in.

[0013]

Means for Solving the Problems To achieve the above object, the waterproofing method of the present invention is a waterproofing method in which a post-cast material is cast on a synthetic resin waterproof material. After spraying and applying a binder coating material, a post-implanted material is cast.

According to the method of the present invention, irregularities are formed on the surface of the synthetic resin waterproof material by the dispersed aggregate, and the irregularities are engaged with the surface of the post-implanted material to exert an anchor effect. In addition, the adhesive strength with the binder coating material and the post-casting material is much higher than that of the conventional method. Further, since the binder coating material is applied after the aggregate has been scattered, there is no need to remove the surplus aggregate that has not adhered, and all the aggregates can effectively function as anchors.

In the present invention, the binder coating is preferably one selected from an epoxy resin-based coating, a urethane resin-based coating, and a curable methyl methacrylate resin-based coating. The above-mentioned binder coating material has particularly good adhesion to a synthetic resin waterproofing material, and therefore can be particularly preferably used.

Further, in the present invention, the synthetic resin waterproofing material is preferably a urethane resin-based waterproofing material. In particular, the urethane resin-based waterproofing material is a mixed type of a base material and a curing agent, and the base material has an isocyanate group. It is preferable to mix them so that the molar ratio between the active hydrogen-containing group and the hardener is 1.3 to 0.8. Thereby, initial waterproof performance, long-term durability, and the like are improved.

Preferably, the synthetic resin waterproofing material is a two-component spray-type urethane resin-based waterproofing material, and the initial curing time at 20 ° C. is 1 to 30 seconds. Thereby, the synthetic resin waterproof material can be cured in a short time, and the construction period can be shortened.

It is also preferable that the synthetic resin waterproofing material is a hand-painted urethane resin waterproofing material, and that the initial curing time at 20 ° C. is 5 minutes to 24 hours. Thereby, scattering at the time of applying the synthetic resin waterproof material can be prevented.

In the present invention, it is preferable that the post-cast material is one selected from concrete, mortar, and asphalt. In the present invention, since the post-cast material can be cast at room temperature, the above-mentioned post-cast material can be particularly preferably used.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic process diagram showing one embodiment of the waterproofing method of the present invention.

In the waterproofing method of the present invention, FIGS.
As shown in (e), a waterproof layer 2 of a synthetic resin waterproof material, an aggregate 3, a coating layer 4 of a binder coating material, and a post-strike material layer 5
Of each layer in order. Hereinafter, each step will be described in order.

First, as shown in FIG. 1B, a waterproof layer 2 made of a synthetic resin waterproof material is applied on a base 1. Here, the base 1 is a surface that requires waterproofing in the pre-waterproofing method of the present invention. For example, concrete, mortar, such as a floor surface, a vertical surface, or a ceiling surface of an underground structure, a lower surface of an asphalt pavement of a bridge, or the like. , Soil cement mortar, steel plate, H steel and the like.

The synthetic resin waterproof material used for the waterproof layer 2 is as follows:
There is no particular limitation as long as it is a coating type waterproof material. For example, urethane resin-based waterproofing materials, polyurea resin-based waterproofing materials, epoxy resin-based waterproofing materials, curable methyl methacrylate (MMA) resin-based waterproofing materials, and the like can be given. Of these, urethane resin-based waterproofing materials are preferable in consideration of initial waterproofing performance, long-term durability, and the like. As the urethane resin-based waterproofing material, a spraying type or a hand-painted type, a one-component type or a mixed type of two or more components may be used. In particular, when shortening the construction period is considered, it is preferable that the urethane resin-based waterproofing material is a two-liquid mixture spray type and the initial curing time at 20 ° C. is 1 to 30 seconds.
In addition, in order to prevent the paint from scattering, it is preferable that the urethane resin-based waterproof material is a hand-painted type and has an initial curing time at 20 ° C. of 5 minutes to 24 hours.
Further, the urethane resin is preferably a two-component mixed type because the influence of humidity is small and the curing time can be easily controlled. In particular, the urethane resin contains a main component mainly composed of polyisocyanate and at least one selected from polyol, polyamine and water. A urethane resin-based waterproofing material mixed with a curing agent is preferred.

The polyisocyanate is not particularly restricted but includes, for example, diphenylmethane-4,4'-diisocyanate (MDI), carbodiimide-modified diphenylmethane diisocyanate (liquid MDI), polymethylene polyphenylisocyanate (crude MDI), 2,4
-Tolylene diisocyanate (2,4-TDI), 2,
Low molecular weight isocyanate compounds such as 6-tolylene diisocyanate (2,6-TDI), xylylene diisocyanate (XDI), and hexamethylene diisocyanate. Further, isocyanate group-terminated prepolymers and buret modified products obtained by modifying the above-mentioned isocyanate compounds are also included. These can be used alone or 2
More than one species may be used in combination. Of these, the aforementioned low molecular weight isocyanate compound and the polyol described below are
O ratio is 1.5-20, isocyanate group content is 1-2
Isocyanate group-terminated prepolymers reacted to be 0% by mass are preferred. Here, the NCO ratio is a mixing ratio of the isocyanate group and the active hydrogen-containing group, that is, a molar ratio obtained by dividing the amount of the isocyanate group by the amount of the active hydrogen-containing group. Here, the active hydrogen-containing group refers to an amino group (—N
H ₂ ), a hydroxyl group (—OH), and the like in the case of a polyol.

When the synthetic resin waterproofing material is a two-component spray-type urethane resin-based waterproofing material, the polyisocyanate is MDI
Alternatively, liquid MDI or a modified product thereof, an isocyanate group-terminated prepolymer, or the like is preferable. In the case of a hand-painted urethane resin waterproofing material, 2,4-TDI, 2,6-T
DI, MDI or liquid MDI or a modified product thereof, isocyanate group-terminated prepolymer, and the like are preferable.

The polyol is not particularly limited as long as it has two or more hydroxyl groups. Examples of the polyol include general polyols such as polyether polyols, polyester polyols and polytetramethylene glycol, and flame-retardant polyols such as phosphorus-containing polyols. No. These may be used alone or in combination of two or more.

The polyamine is not particularly restricted but includes aromatic polyamines and aliphatic polyamines. Specifically, diethyltoluenediamine, dialkyl-4,4'-methylenedianiline, tetraalkyl-
4,4'-methylenedianiline, 4,4'-methylenebis (2-chloroaniline), bismethylthiotoluenediamine, polyoxyalkylenediamine, meta-xylylenediamine and the like. These may be used alone or in combination of two or more.

In the urethane resin-based waterproofing material in which the main agent and the curing agent are mixed, the urethane resin-based waterproofing material is mixed so that the molar ratio (NCO ratio) between the isocyanate group of the main agent and the active hydrogen-containing group of the curing agent is 1.3 to 0.8. It is more preferable to mix them so as to be 1.25 to 0.9. When the NCO ratio exceeds 1.3 and the isocyanate compound is excessive and the curing is slow, the excess isocyanate group reacts with moisture in the air to generate carbon dioxide gas in the coating film, and It is not preferable because the strength may decrease. If the NCO ratio is less than 0.8 and the amount of polyols, polyamines, etc. is excessive, unreacted polyols, polyamines, etc., remain in the coating film, which is unfavorable because strength reduction and bleeding may occur.

Also, if necessary, the synthetic resin waterproof material
Plasticizers, curing catalysts, fillers, antioxidants, flame retardants, stabilizers, ultraviolet absorbers, surfactants, additives such as color pigments may be added, but especially when a plasticizer is contained It is preferably 25% by mass or less based on the synthetic resin waterproof material. If it exceeds 25% by mass, it may be difficult to obtain an adhesive strength, which is not preferable.

As a method of applying the waterproof layer 2, a conventionally known method can be used and is not particularly limited. Further, in the present invention, the waterproof layer 2 may be provided directly on the base 1, or may be applied after applying a primer. The primer is not particularly limited, but a primer such as a urethane resin-based primer or an epoxy resin-based primer that can sufficiently adhere the base 1 and the waterproof layer 2 is preferable. Although the set thickness of the waterproof layer 2 is arbitrary,
From the viewpoint of a load applied to a skeleton such as a bridge, 1 to 10 mm is preferable. Further, the waterproof layer 2 may be composed of only one layer or may be composed of two or more layers, and can be appropriately selected depending on the material of the base 1 and unevenness.

Next, as shown in FIG.
Spray aggregate 3 on top. Here, the type and shape of the aggregate 3
The particle size is not particularly limited. Examples of the type of aggregate include silica sand, river sand, ceramics, glass beads, crushed stone, and crushed plastics, and can be used alone or in combination of two or more. The shape of the aggregate is preferably one having irregularities as much as possible in consideration of the adhesiveness to the post-cast material. The average particle size of the aggregate is preferably 1 to 20 mm, in order to obtain a sufficient adhesive strength between the waterproofing material and the post-cast material,
15 mm is more preferred.

The amount of the aggregate 3 to be sprayed is 0.1 to 1 m ^2.
3 kg is preferable, and 0.3 to 2 kg is more preferable. If the amount of spraying is less than 0.1 kg per 1 m ² , sufficient unevenness is not formed on the surface of the binder coating material, and it is difficult to obtain an adhesive strength with the post-cast material, which is not preferable. If it exceeds 3 kg per 1 m ² , the aggregate is not sufficiently fixed to the synthetic resin waterproof material by the binder coating material, and the adhesive strength tends to be low, and peeling is likely to occur, which is not preferable.

The timing of spraying the aggregate 3 may be after the waterproof layer 2 is cured or in a semi-cured state before it is completely cured. In particular, it is preferable to spray the aggregate in the semi-cured state of the waterproof layer, since the aggregate is fixed to the waterproof layer 2. However, when spraying aggregate with the synthetic resin waterproof material in a semi-cured state,
It is preferable that there are two or more waterproof layers 2 in that the thickness of the waterproof layer 2 is ensured and good waterproof performance can be expected. That is, after one or more layers of the synthetic resin waterproofing material have been cured,
It is preferable to apply the synthetic resin waterproof material of the layer, and to spray the aggregate in a state where the last applied synthetic resin waterproof material is in a semi-cured state. In this case, the amount of the synthetic resin waterproofing material applied last is preferably 0.1 to 3 kg per 1 m ² ,
0.3-1.5 kg is more preferred. When the construction amount is less than 0.1 kg per 1 m ^2, the fixation of the aggregate is likely to be insufficient. If it exceeds 3 kg per 1 m ^{2, the} aggregate will settle in the synthetic resin waterproof material, and it is difficult to form sufficient unevenness on the synthetic resin waterproof material surface, which is not preferable.

Next, as shown in FIG. 1D, a binder coating material is formed as a coating layer 4 on the waterproof layer 2 on which the aggregate 3 has been scattered. Thereby, the uneven surface 4a is formed on the surface of the coating layer 4 and the surface of the aggregate 3 is covered with the binder coating material.
There is no need to remove excess aggregate, and all aggregates can function effectively as anchor materials. Furthermore, since the anchor effect can be exerted even when the aggregate 3 is sprayed after the waterproof layer 2 is sufficiently cured, the degree of freedom of the construction work is increased.

The specific binder coating material constituting the coating layer 4 is not particularly limited as long as it has good adhesion to the waterproof layer 2. For example, an epoxy resin coating material or a urethane resin coating material , MMA resin-based coating material, polyester resin-based coating material, ethylene-vinyl acetate resin-based coating material, asphalt mixture coating material, and the like. Among these, epoxy resin-based coating materials, urethane resin-based coating materials or M
MA resin-based coating materials are preferred.

The construction amount of the coating layer 4, 1m ² per 0.1
３3 kg is preferred, and 0.3-1.5 kg is more preferred. When the construction amount is less than 0.1 kg per 1 m ^2, the fixation of the aggregate is likely to be insufficient. The 1m ² per 3kg
If the number exceeds the limit, the aggregate is buried in the binder coating material, and it is difficult to form sufficient unevenness on the surface of the binder coating material, which is not preferable. Further, a conventionally known coating method or the like can be used as a method for forming the coating layer 4 and is not particularly limited.

In the present invention, the application of the aggregate and the application of the binder coating means not only the application of the binder application after the application of the aggregate but also the application of the aggregate and the application of the binder simultaneously. Means to do. That is, the application of the coating layer 4 may be performed after the aggregate 3 is scattered,
The application of the aggregate 3 may be performed at the same time. In particular, when applying the binder coating material by spray coating, it is preferable to perform the coating simultaneously with the application of the aggregate. Applying the binder coating material after the application of the waterproof layer 2 or after the application of the aggregate, or simultaneously with the application of the aggregate, makes it unnecessary to remove the excess aggregate, and the entire amount of the applied aggregate is effectively used. preferable.

Finally, as shown in FIG. 1 (e), a post-cast material layer 5 is formed on the coating layer 4. At this time, as described above, the uneven surface 4a is formed on the surface of the coating layer 4 by the unevenness of the aggregate 4.
Are formed, the irregularities and the surface of the post-cast material layer are engaged with each other to exhibit an anchor effect.
And the adhesive strength with the adhesive can be increased.

Here, the post-casting material is a structural material constructed after the waterproofing material is applied in the first waterproofing method, such as a pavement material of a bridge slab, a floor, a wall or a ceiling of an underground structure.
Specifically, materials such as concrete, mortar, asphalt and the like can be mentioned.

The post-implantation material layer 5 may be applied after the binder coating material has been cured or before it has been sufficiently cured. If the binder coating material is cast before it is sufficiently hardened, the gravel, sand, cement grains, and the uneven surface of the asphalt contained in the concrete of the post-cast material are physically applied to the coating layer 4 before hardening. Since the anchoring effect due to the partial penetration is also exerted, the adhesive strength between the coating layer 4 and the post-strike material layer 5 can be further improved.

In the present invention, "before the binder coating material is sufficiently cured" means that the binder coating material is in a liquid or plastically deformable state at the temperature at which the post-finished material is cast. In particular, when the post-casting material is asphalt, it can be said that the binder coating material is before it is sufficiently cured, even if the binder coating material is almost solidified at room temperature, if it can be plastically deformed by the high temperature at the time of asphalt casting. Specifically, in the case of a post-punched material such as concrete or mortar that is cast at room temperature, it means a cured state having a viscosity at room temperature (0 to 40 ° C.) of about 0.1 to 1 × 10 ³ Pa · s. I do. In the case of a post-punched material such as asphalt, which is cast at a high temperature, it means a cured state in which the viscosity at a high temperature (200 to 300 ° C.) during the casting is about 0.1 to 1 × 10 ³ Pa · s.

[0042]

EXAMPLES The present invention will be described in detail with reference to the following examples, but the present invention is not limited to these examples. (Examples 1 to 4) As a synthetic resin waterproofing material, a two-liquid mixed spray type urethane resin-based waterproofing material (initial curing time at 20 ° C. for 10 seconds) is applied to two 30 cm × 30 cm concrete plates with a thickness of 3 mm. did. After the urethane resin-based waterproofing material is cured, the same urethane resin-based waterproofing material is further applied to 1 m ²
1 kg per unit, and immediately after the application, the amount of No. 3 silica sand (average particle size 1.2 mm) shown in Table 1 was sprayed. Then, the same urethane resin-based waterproofing material was further applied as a binder coating material in the application amount shown in Table 1 to fix the silica sand. Twenty-four hours after the completion of the construction, concrete and asphalt were cast 20 mm each on one test piece and cured for 7 days to obtain test pieces of Examples 1 to 4.

The two-component mixed spray type urethane waterproofing materials used in Examples 1 to 4 used the following main ingredients and curing materials. The main agent reacts 49.8 parts by mass of liquid MDI (manufactured by Nippon Polyurethane Industry: Millionate MTL) with 50.2 parts by mass of polypropylene diol having a molecular weight of 3000 (N
(CO ratio: 10.7) An isocyanate group-terminated prepolymer (isocyanate group content: 13.2% by mass), and 10 parts by mass of dioctyl phthalate and 10 parts by mass of tris (β-chloropropyl) phosphate were added as plasticizers. . As the curing agent, 65.2 parts by mass of polypropylene diol having a molecular weight of 2,000, 18.4 parts by mass of diethyltoluenediamine (Etacur 100, manufactured by Albemarle), and polyoxyalkylenediamine having a molecular weight of 2,000 (Jeffamine D-2000, manufactured by San Techno Chemical Co., Ltd.) 16.
4 parts by mass, 10 parts by mass of dioctyl phthalate and Tris (β
A mixture of 10 parts by weight of (-chloropropyl) phosphate was used. The mixing ratio of the main agent and the curing agent is such that the volume ratio is 1: 1,
Spraying was performed using a two-liquid collision mixing machine so that the NCO ratio was 1.12.

(Examples 5 to 8) Using a two-liquid mixed hand-painted urethane waterproofing material (initial curing time at 20 ° C. for 8 hours) as a waterproofing layer, 1 kg of No. 3 silica sand was sprayed per 1 m ² ,
Further, the coating was performed under the same conditions as in Examples 1 to 4 except that the coating was performed with the type and amount of the binder coating material shown in Table 2 and concrete and asphalt were cast 4 to 5 minutes after the completion of the application of the binder coating material. The test pieces of Examples 5 to 8 were obtained.

The two-component mixed hand-painted urethane waterproofing materials used in Examples 5 to 8 used the following main ingredients and curing materials.
The main agent is a mixture of 2,4-TDI and 2,6-TDI (2,4-TDI / 2,6-TDI is 80/20 by mass ratio)
13.5 parts by mass, 30.4 parts by mass of polypropylene triol having a molecular weight of 5000, 25.5 parts by mass of polypropylene triol having a molecular weight of 3000, and molecular weight of 2,000
30.6 parts by weight of polypropylene diol (NC)
An isocyanate group-terminated prepolymer having an O ratio of 2.1) was used (isocyanate group content: 3.42% by mass). The curing agent was 1.5 parts by mass of 4,4'-methylenebis (2-chloroaniline) (MOCA), 23.2 parts by mass of a polypropylene triol having a molecular weight of 5000, and a molecular weight of 20.
A mixture of 15.0 parts by mass of dipropylene glycol of No. 00 and 60.3 parts by mass of calcium carbonate was used as a filler. The mixing ratio of the main agent and the curing agent is 1: 2 (NCO
After mixing with a stirrer at a ratio of 1.08), the mixture was spread using a trowel.

The epoxy resin binder coating material used in Examples 5 and 6 was 100 parts by mass of a bisphenol A type epoxy resin (manufactured by Asahi Denka Kogyo KK: EP-4520S) and an aliphatic polyamine resin (manufactured by Asahi Denka Kogyo KK). EH-220) 40
It was a mixture of parts by mass and was applied using an airless spray. The MMA resin-based binder coating material used in Examples 7 and 8 was Acrylicup DR-80 manufactured by Mitsubishi Rayon Co., Ltd., which had an initial curing time of 30 minutes, and was applied using a gold spatula.

(Examples 9 to 10) Example 5 was performed except that the type and amount of the waterproof material and the binder coating material shown in Table 3 were used.
Test pieces of Examples 9 to 10 were obtained under the same conditions as in Examples 8 to 8.

The polyurea resin-based waterproofing material used in Example 9 was a two-component mixed spray type (the initial curing time at 20 ° C. was 1).
(0 seconds), the following main agent and curing agent were used. Main agent is liquid MDI
(Nippon Polyurethane Industry: Millionate MTL) 4
9.8 parts by mass was reacted with 50.2 parts by mass of polypropylene diol having a molecular weight of 3000 (NCO ratio: 10.7) to obtain an isocyanate group-terminated prepolymer (isocyanate group content: 13.2% by mass). 20.4 parts by mass of diethyltoluenediamine (manufactured by Albemar Corporation: Etacure 100), molecular weight 10
9.4 parts by mass of an aromatic diamine of No. 00 (Elastomer 1000P, manufactured by Ihara Chemical Co.) and a molecular weight of 2000
Of polyoxyalkylene diamine (manufactured by San Techno Chemical Co., Ltd .: Jeffamine D-2000) was used in an amount of 70.2 parts by mass. The mixing ratio of the main agent and the curing agent was such that the volume ratio was 1: 1 and the NCO ratio was 1.11, and spray coating was performed using a two-liquid collision mixing machine.

The MMA resin-based waterproofing material used in Example 10 was manufactured by Mitsubishi Rayon Co., Ltd. Acrylicup XD-359 (20
(Initial curing time at 1 ° C. for 1 hour), and was applied using a trowel.

(Comparative Examples 1 to 4) Comparative Examples 1 to 4 were carried out under the same conditions as in Example 1 except that the binder was not applied with the types of waterproofing materials and the amount of silica sand shown in Table 4. 4 test pieces were obtained.

(Test Example) For the test pieces of Examples and Comparative Examples, a 4 cm × 4 cm cut was made so as to reach the base concrete of the waterproof layer, and a Kenken type tensile adhesion tester (LPT- (400 handy type). Table 1 shows the results of Examples 1 to 4.
Table 2 shows the results of Examples 5 to 8, Table 3 shows the results of Examples 9 and 10, and Table 4 shows the results of Comparative Examples 1 to 4.

[0052]

[Table 1]

[0053]

[Table 2]

[0054]

[Table 3]

[0055]

[Table 4]

From the results shown in Tables 1 to 3, Examples 1 to 3 of the present invention are shown.
In the case of No. 10, the adhesive strength was 1 MPa or more for both concrete and asphalt as post-cast materials, which were practically sufficient. Table 4
According to the results, in Comparative Examples 1 and 3 in which neither silica sand nor a binder coating material was provided, the adhesive strength was as low as 0.1 MPa, and after the silica sand was sprayed, a post-finish material was directly cast without providing a binder coating material. In Comparative Examples 2 and 4, the adhesive strength was 1
MPa or lower, which indicates that practically sufficient adhesive strength cannot be obtained.

[0057]

As described above, according to the present invention,
Can be used with synthetic resin waterproofing material with excellent adhesive strength between the synthetic resin waterproofing material and the backing material. It is suitable for waterproofing mortar on a rooftop.

[Brief description of the drawings]

FIG. 1 is a schematic process diagram showing one embodiment of a waterproofing method of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base 2 Waterproof layer 3 Aggregate 4 Coating layer 4a Uneven surface 5 Post-cast material layer

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2D051 AA01 AC01 AF03 AG01 AG13 AG14 AG17 CA02 EA01 EA06 2D059 AA14 GG02 GG37

Claims (7)

[Claims] 1. A waterproofing method for casting a post-cast material on a synthetic resin waterproof material, wherein an aggregate is sprayed on the synthetic resin waterproof material, a binder coating material is applied, and then the post-cast material is cast. A waterproof construction method characterized by the following. 2. An epoxy resin-based coating material, wherein the binder coating material is
The waterproofing method according to claim 1, which is one selected from a urethane resin-based coating material and a curable methyl methacrylate resin-based coating material. 3. The waterproofing method according to claim 1, wherein the synthetic resin waterproofing material is a urethane resin-based waterproofing material. 4. The urethane resin-based waterproofing material is a mixed type of a main agent and a curing agent, and the molar ratio of the isocyanate group of the main agent to the active hydrogen-containing group of the curing agent is 1.3 to 0.8. The waterproofing method according to claim 3, wherein the mixing is performed in such a manner as to be performed as follows. 5. The waterproofing material according to claim 3, wherein the synthetic resin waterproofing material is a two-part mixed spray type urethane resin-based waterproofing material, and the initial curing time at 20 ° C. is 1 to 30 seconds. Construction method. 6. The waterproofing method according to claim 3, wherein the synthetic resin waterproofing material is a hand-painted urethane resin-based waterproofing material, and the initial curing time at 20 ° C. is 5 minutes to 24 hours. 7. The post-cast material is concrete, mortar,
The waterproofing method according to any one of claims 1 to 6, wherein the waterproofing method is one selected from asphalt.