JP2005089979A - Composite waterproofing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a composite waterproofing method used for waterproofing of a floor slab of a bridge or the like to improve the adhesive property of a waterproof layer and an asphalt layer. <P>SOLUTION: The waterproof layer A formed of a urethane-based waterproof material, a waterproof adhesive layer B formed of a waterproof adhesive containing an asphalt emulsion based waterproof material, a urethane resin composition and/or an epoxy resin composition and containing 1-100 mass pts. urethane resin composition and epoxy resin composition by solid content conversion to solid content 100 mass pts. asphalt emulsion based waterproof material, and an asphalt pavement layer C, are sequentially formed on a base body G. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a composite waterproofing method using a urethane-based waterproofing material and an asphalt emulsion-based waterproofing material that is suitably used for waterproofing floor slabs of bridges, for example.

  In recent years, it has become a problem for rainwater to run around the bridge surface of a highway, etc., only by asphalt pavement on the concrete surface of the bridge body and to promote deterioration of the concrete. That is, since the concrete surface is not sufficiently waterproofed, the problem that the durability of the bridge is lowered before the end of the service life of about 60 years in the initial design has been surfaced.

  On the other hand, in recent years, a technique for providing a waterproof layer between an asphalt pavement and a base of a floor slab made of concrete or the like has been developed. As such a waterproofing method, a sheet-based waterproofing method using a molded sheet as a waterproofing layer and a coating-based waterproofing method using a resin coating such as urethane as a waterproofing layer are being studied.

  However, with the sheet-based waterproofing method, the adhesion between the molded sheet and the base of the floor slab tends to be insufficient, and the sheet tends to peel and swell, and the construction efficiency is low and the daily construction area is low. There was a problem of being constrained.

  Further, the coating film waterproofing method has a problem that the adhesion between the coating film waterproof layer and the asphalt pavement layer tends to be insufficient, and the asphalt pavement surface tends to be damaged.

In order to solve the above-described problems, it has been studied to provide an intermediate layer having adhesiveness between the waterproof layer and the asphalt layer. For example, a two-component mixed flexible fast-curing liquid resin is applied on a wet surface adhesive layer applied to a floor slab to form a primary waterproof layer, and after the primary waterproof layer is cured, an asphalt emulsion or a rubber-modified asphalt emulsion Sprinkle a waterproof adhesive made by mixing and dispersing granular or powder hot melt adhesive on the surface, and then pave a heated asphalt surface pavement to melt and flow the hot melt adhesive to make the primary waterproof layer and asphalt A technique for forming a secondary waterproof adhesive layer between surface pavements and bonding them together has been proposed (see Patent Document 1).
Japanese Patent Laid-Open No. 2003-90006

  However, in the method disclosed in JP-A-2003-90006, as the secondary waterproof adhesive layer, a waterproof adhesive in which resin powder or granules after polymerization are mixed and dispersed in an emulsion containing asphalt is used. For this reason, the strength of the secondary waterproof adhesive layer itself tends to be insufficient. In addition, the adhesion between the primary waterproof layer and the secondary waterproof adhesive layer tends to be insufficient. Therefore, there has been a problem that the reliability of the waterproof layer including the strength remains uneasy as a whole.

  The present invention has been made in view of the above-described problems of the prior art, and sufficiently improves the adhesion between the waterproof layer and the asphalt layer by a simple process, thereby maintaining the reliability of the waterproof layer over a long period of time. An object is to provide a composite waterproof construction method.

In order to achieve the above object, one of the composite waterproofing methods of the present invention is:
On the base, a waterproof layer (A) made of urethane waterproof material,
An asphalt emulsion waterproof material and a urethane resin composition and / or an epoxy resin composition, wherein the urethane resin composition and the epoxy resin composition are solid with respect to 100 parts by mass of the solid content of the asphalt emulsion waterproof material. A waterproof adhesive layer (B) made of a waterproof adhesive containing 1 to 100 parts by mass in terms of minutes;
The asphalt pavement layer (C) is sequentially formed.

  According to the composite waterproofing method of the present invention, the waterproof adhesive layer (B) uses a waterproof adhesive containing an asphalt emulsion waterproof material and a urethane resin composition and / or an epoxy resin composition. (B) A coating strength sufficient for itself can be obtained. Moreover, the adhesiveness of urethane and an asphalt component with low adhesiveness can be improved by the urethane resin and / or epoxy resin which are adhesive resin components. Therefore, the waterproof layer (A) and the asphalt pavement layer (C) can be firmly bonded.

  Moreover, the urethane resin composition and / or the epoxy resin composition are blended in the state of the composition before polymerization and curing. For this reason, since the adhesive resin component is uniformly dispersed and cured in the waterproof adhesive layer (B), the adhesiveness between the waterproof layer (A) and the asphalt pavement layer (C) becomes uniform, and the adhesive strength is improved.

Another one of the composite waterproofing methods of the present invention is:
On the base, a waterproof layer (A) made of urethane waterproof material,
A primer layer (D) comprising a urethane resin composition and / or an epoxy resin composition;
A second waterproof layer (E) made of an asphalt emulsion waterproof material;
The asphalt pavement layer (C) is sequentially formed.

  Here, it is preferable that the second waterproof layer (E) is formed before the primer layer (D) is cured.

  Also by this composite waterproofing method, it is excellent in the adhesiveness of a waterproof layer (A) and an asphalt pavement layer (C) similarly to said 1st method, Therefore A waterproof layer with high reliability can be constructed.

  In the present invention, it is preferable to form the waterproof layer (A) after forming the substrate primer layer (F) on the substrate. According to this, the adhesiveness of a base | substrate and a waterproof layer (A) can be improved more.

Furthermore, in the present invention, the waterproof layer (A) is formed so that the tensile strength in the tensile strength test specified in JIS-A6021 is 2.5 N / mm ² or more and the elongation at break is 200% or more. It is preferable to form. In addition, the waterproof adhesive layer (B) or the second waterproof so that the tensile strength in the tensile strength test specified in JIS-A6021 is 0.25 N / mm ² or more and the elongation at break is 300% or more. It is preferable to form the layer (E). According to these aspects, since the waterproof layer has sufficient strength and elongation, it is possible to prevent the waterproof layer from breaking even when a crack or the like occurs in the substrate, and the reliability as the waterproof layer is further improved. It can be improved.

  ADVANTAGE OF THE INVENTION According to this invention, the waterproof layer which is excellent in the adhesiveness of a waterproof layer and an asphalt layer, and has high reliability can be constructed.

  Hereinafter, the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows an embodiment of a laminated structure formed by the first composite waterproofing method of the present invention. On a base (G), a base primer layer (F), a waterproof layer (A), It is sectional drawing at the time of forming a waterproof contact bonding layer (B) and an asphalt pavement layer (C) in order.

  In FIG. 1, the base body (G) is a base that requires waterproof construction such as mortar, concrete, and steel plate. Depending on the surface state of the substrate (G), prior to the formation of the substrate primer layer (F), roughening, removal of latency, or application of resin mortar or the like (for unevenness adjustment), etc. Pre-processing may be performed as necessary.

  In this embodiment, first, a base primer layer (F) is formed on the base (G). The material of the base primer layer (F) is not particularly limited as long as it has good adhesion to the base (G) and the waterproof layer (A). For example, a urethane primer, an epoxy primer, an acrylic primer Etc. can be used. Also, any of solvent-based, solvent-free, and aqueous systems can be used.

The coating amount of the base primer layer (F) can be appropriately set depending on the type and state of the base (G), but 0.1 to 0.5 kg per 1 m ² may be applied once or multiple times. preferable. The substrate primer layer (F) can be formed by a roller, a brush, a spray, or the like, and is not particularly limited, but application by a roller is preferably performed.

  In the present invention, the base primer layer (F) is not essential, but the base primer layer (F) may be formed in order to improve the adhesion between the base (G) and the waterproof layer (A). preferable.

  Next, after the base primer layer (F) is dried or cured, a waterproof layer (A) made of a urethane waterproof material is formed.

  The urethane waterproof material is not particularly limited, and conventionally known waterproof materials can be used. In terms of one-pack or two-pack, a main component mainly composed of an isocyanate group-terminated urethane prepolymer obtained by reacting excess polyisocyanate and polyol, and at least one selected from polyol, polyamine and water as a main component Either a two-component curable urethane waterproofing material mixed with a curing agent to be used, or a one-component urethane waterproofing material mainly composed of an isocyanate group-terminated urethane prepolymer can be used. In terms of the coating method, either a hand-coated urethane waterproof material or a super-fast-curing sprayed urethane waterproof material can be used. Among these, from the viewpoint of workability and curability, it is preferable to use a two-component curing type ultra-fast curing type sprayed urethane waterproof material.

The application amount of the waterproof layer (A) can be appropriately set depending on the type and state of the substrate (G), but usually 1.0 to 5.0 kg per 1 m ² may be applied once or a plurality of times. preferable.

In addition, in order to obtain sufficient waterproof performance as a urethane waterproof material, the waterproof layer (A) has a tensile strength of 2.5 N / mm ² or more in the tensile strength test specified in JIS-A6021, and breaks. The elongation is preferably 200% or more. When the tensile strength is less than ^2.5 N / mm ² or the elongation at break is less than 200%, the waterproof layer (A) is likely to break due to cracks or the like generated in the base (G), which is not preferable.

  Here, the tensile strength test stipulated in JIS-A6021 for the waterproof layer (A) is a dumbbell-shaped No. 3 shape, and is pulled until the test piece breaks at a tensile speed of 500 mm / min. Tensile strength and elongation at break.

  Next, after the waterproof layer (A) is cured, a waterproof adhesive layer (A) comprising a waterproof adhesive containing an asphalt emulsion waterproof material and a urethane resin composition and / or an epoxy resin composition on the waterproof layer (A) ( B) is formed.

  It does not specifically limit as an asphalt emulsion type waterproofing material, A conventionally well-known thing can be used. The asphalt emulsion type waterproofing material used in the present invention is an oil-in-water emulsion, in which asphalt particles are dispersed in an aqueous phase. Rubber particles and rubber asphalt (asphalt is mixed with rubber or polymer as necessary). The modified asphalt) particles are preferably dispersed, and may further contain a plasticizer, cement, crushed stone, and additives.

  Asphalt components include straight asphalt, semi-blown asphalt, blown asphalt, petroleum asphalt such as propane deasphalted asphalt, and natural asphalt such as lake asphalt, and one or more of these are used.

  As rubber components contained in rubber particles and rubber asphalt particles, natural rubber, backlash, cyclized rubber, butadiene rubber, butyl rubber, halogenated butyl rubber, chloroprene rubber, styrene / butadiene rubber, isoprene rubber, styrene / isoprene rubber, There are chlorinated polyethylene, chlorosulfonated polyethylene, ethylene propylene rubber, EPT (ethylene propylene terpolymer) rubber, alphine rubber and the like, and one or more of these are used.

  Polymer components contained in rubber asphalt particles include ethylene / vinyl acetate copolymer, ethylene / acrylate copolymer, vinyl chloride / vinyl acetate copolymer, polyethylene, vinyl acetate / acrylate copolymer, etc. 1 type (s) or 2 or more types are used.

  And in this embodiment, what contains said asphalt emulsion type waterproofing material and a urethane resin composition and / or an epoxy resin composition is used as a waterproof adhesive material.

  In general, asphalt waterproofing material has very poor adhesion to urethane waterproofing material, and asphalt waterproofing material usually peels easily from urethane waterproofing material. Moreover, the adhesiveness of a urethane waterproof material and an asphalt waterproofing material can be improved by containing the urethane resin composition and epoxy resin composition with favorable adhesiveness with a urethane type waterproof material.

  The urethane resin composition is not particularly limited as long as it has a urethane bond or a urea bond. For example, a main component mainly composed of an isocyanate group-terminated urethane prepolymer obtained by reacting an excess polyisocyanate with a polyol; , A two-component type containing a curing agent mainly composed of at least one selected from polyol, polyamine and water can be used. Further, as another example, one-pack type (only the two-pack type main agent) can be used. These may be blended in advance in an asphalt emulsion waterproof material, or may be used by mixing with an asphalt emulsion waterproof material immediately before construction.

  Moreover, it does not specifically limit as an epoxy resin composition, For example, what contains bisphenol A type epoxy resin, bisphenol F type epoxy resin, and polyamine can be used. These may be premixed with an epoxy resin in an asphalt emulsion waterproof material and mixed with a polyamine just before construction, or mixed with an asphalt emulsion waterproof material, an epoxy resin, or a polyamine resin just before construction. May be.

  Moreover, said urethane resin composition and epoxy resin composition may mix | blend only one side with an asphalt emulsion type waterproofing material, and may use both together.

  The content of the urethane resin composition and / or the epoxy resin composition with respect to the asphalt emulsion waterproof material is such that the urethane resin composition and the epoxy resin composition are solid content with respect to 100 parts by mass of the solid content of the asphalt emulsion waterproof material. It is 1-100 mass parts in conversion, Preferably it is 5-60 mass parts.

  When the solid content of the urethane resin composition and the epoxy resin composition is less than 1 part by mass relative to 100 parts by mass of the solid content of the asphalt emulsion waterproof material, sufficient adhesion between the waterproof layer (A) and the waterproof adhesive layer (B) Is not preferable, and the amount exceeding 100 parts by mass is not preferable because the waterproof adhesive layer (B) becomes too hard and easily breaks.

The method for forming the waterproof adhesive layer (B) can be performed by a roller, a brush, a spray, or the like, but is not particularly limited, but coating by a roller is preferable. Moreover, although the application quantity of a waterproof contact bonding layer (B) can be set suitably, it is preferable to apply | coat 0.3-2.0 kg per m < ² > once or in multiple times.

The waterproof adhesive layer (B) preferably has a tensile strength of 0.25 N / mm ² or more and a breaking elongation of 300% or more in the tensile strength test specified in JIS-A6021. When the tensile strength is less than 0.25 N / mm ² or the elongation at break is less than 300%, the waterproof adhesive layer (B) is likely to break due to cracks or the like generated in the substrate (G), which is not preferable.

  Here, the tensile strength test stipulated in JIS-A6021 for the waterproof adhesive layer (B) is a dumbbell-shaped No. 2 shape, and when the test piece is pulled at a tensile speed of 500 mm / min until it breaks. , Tensile strength and elongation at break.

  Finally, an asphalt pavement layer (C) is formed on the waterproof adhesive layer (B). At this time, since the waterproof adhesive layer (B) contains an asphalt component, sufficient adhesion between the waterproof adhesive layer (B) and the asphalt pavement layer (C) can be obtained.

  The asphalt of the asphalt pavement layer (C) is not particularly limited. Conventionally known asphalts such as petroleum asphalt such as straight asphalt, semi-blown asphalt, blown asphalt and propane deasphalted asphalt, and natural asphalt such as lake asphalt can be used. is there.

  FIG. 2 shows an embodiment of a laminated structure formed by the second composite waterproofing method of the present invention. In the following description of the embodiment, the same parts as those in FIG. 1 are given the same reference numerals, and the description thereof is omitted.

  In FIG. 2, when a base primer layer (F), a waterproof layer (A), a primer layer (D), a second waterproof layer (E), and an asphalt pavement layer (C) are sequentially formed on the base (G). 1 is different from FIG. 1 in that a primer layer (D) and a second waterproof layer (E) are sequentially formed instead of the waterproof adhesive layer (B) of FIG. .

  The substrate primer layer (F) and the waterproof layer (A) formed on the substrate (G) are formed by the same method as in the embodiment of FIG.

  The primer layer (D) formed on the waterproof layer (A) is composed of a urethane resin composition and / or an epoxy resin composition. As the urethane resin composition and the epoxy resin composition, a resin composition similar to the urethane resin composition and / or the epoxy resin composition constituting the waterproof adhesive layer (B) can be used.

A method for forming the primer layer (D) can be performed by a roller, a brush, a spray, or the like, and is not particularly limited, but a construction using a roller is preferably performed. The primer layer (D) is preferably applied in an amount of 0.1 to 0.5 kg per m ² once or a plurality of times.

  Next, a second waterproof layer (E) made of an asphalt emulsion waterproof material is formed on the primer layer (D). As the asphalt emulsion waterproof material, the same waterproof material as the asphalt emulsion waterproof material constituting the waterproof adhesive layer (B) can be used.

The method for forming the second waterproof layer (E) can be performed by a roller, a brush, a spray, or the like, and is not particularly limited, but a construction using a roller is preferably performed. Moreover, it is preferable that the coating amount of the second waterproof layer (E) is 0.3 to 2.0 kg per 1 m ^{2 and} applied in one or more times.

  According to the second composite waterproof construction method, the primer layer (D) allows adhesion between the waterproof layer (A) made of urethane waterproof material and the second waterproof layer (E) made of asphalt emulsion waterproof material. improves.

  In addition, it is preferable that the 2nd waterproof layer (E) contains a urethane resin composition and / or an epoxy resin composition similarly to a waterproof contact bonding layer (B) other than an asphalt emulsion type waterproof material. This further improves the adhesion between the waterproof layer (A) and the asphalt pavement layer (C).

  The formation of the second waterproof layer (E) is preferably performed before the primer layer (D) is cured. As a result, the asphalt emulsion type waterproofing material is applied in a state where the primer layer (D) has a stickiness before being cured or dried, so that adhesion is achieved by welding the primer layer (D) and the second waterproof layer (E). Will be improved. Note that “before curing” in the present invention is before curing and drying in “(5) Evaluation” of “Drying time” defined in JIS-K5400-6.5, and is dry to touch or semi-cured. It may be.

  In the present invention, the embodiment of FIG. 1 which is the first composite waterproof method and the embodiment of FIG. 1 which is the first composite waterproof method and the embodiment of FIG. A form is more preferable. According to the first composite waterproof construction method, in addition to improving the adhesion between the waterproof layer (A) and the asphalt pavement layer (C) by the waterproof adhesive layer (B), urethane is applied to the waterproof adhesive layer (B). By containing the resin composition and / or the epoxy resin composition, the strength of the waterproof adhesive layer (B) itself can be improved. Therefore, breakage of the waterproof adhesive layer (B) due to cracks or the like generated in the base (G) can be further prevented.

  Moreover, in this invention, you may mix the granular material with a particle size of about 0.1-3.0 mm with the material constructed at each process, or you may spread immediately after application | coating. As a result, the anchoring effect with the material of the next process is added and the adhesion is further improved. As the granular material, silica sand, urethane rubber, EPDM rubber, natural rubber, pulverized waste tire, or the like can be used.

  Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples.

(Example 1)
A concrete board is used as the substrate (G), a solvent-type epoxy primer as the substrate primer layer (F), a two-component curable ultrafast curing urethane waterproof material as the waterproof layer (A), and an asphalt emulsion as the waterproof adhesive layer (B). A test specimen having the configuration shown in FIG. 1 except for the asphalt pavement layer (C) was prepared in the following procedure using a waterproof adhesive containing a water-based waterproof material and an epoxy resin.

First, as a solvent type epoxy primer, 100 parts by mass of an epoxy primer main agent containing 40 parts by mass of a bisphenol A type epoxy resin and 100 parts by mass of an epoxy primer curing agent containing 20 parts by mass of an aliphatic polyamine, and cement Using a mixture of 200 parts by mass (Sarah Seine PE-900: manufactured by Asahi Glass Polyurethane Building Materials Co., Ltd.), this was applied onto the substrate (G) using a roller at 0.25 kg per 1 m ² and the substrate primer layer (F) Formed.

Next, two hours after the formation of the base primer layer (F), two-part curing comprising 105 parts by mass of the main component mainly composed of an isocyanate group-terminated urethane prepolymer and 100 parts by mass of a curing agent mainly composed of polyol and polyamine. A waterproof layer (A) was formed by spraying a type super fast curing sprayed urethane waterproofing material (Sarah Seine SR: manufactured by Asahi Glass Polyurethane Building Materials Co., Ltd.) at a rate of 2.0 kg per 1 m ² .

One hour after the formation of the waterproof layer (A), 100 parts by mass of a rubber-containing asphalt emulsion waterproof material (gasfalt: manufactured by Nippon Cement Waterproofing Company) with a solid content of 65% by mass is self-emulsifying type bisphenol A. Type epoxy resin 2.4 parts by mass and aliphatic polyamine resin 1 part by mass waterproof adhesive (containing as much as 5.2 parts by mass of epoxy resin composition with respect to 100 parts by mass of solid content of asphalt emulsion type waterproofing material) This was applied using a roller at 0.5 kg per 1 m ² to form a waterproof adhesive layer (B).

(Example 2)
As a waterproof adhesive used for the waterproof adhesive layer (B), a mixture of 24 parts by mass of a self-emulsifying bisphenol A type epoxy resin and 10 parts by mass of an aliphatic polyamine resin with respect to 100 parts by mass of an asphalt emulsion type waterproof material (asphalt A test specimen was prepared in the same manner as in Example 1 except that the solid content of the epoxy resin composition was 52 parts by mass with respect to 100 parts by mass of the emulsion waterproofing material.

(Example 3)
As a waterproof adhesive used in the waterproof adhesive layer (B), a moisture-curing solvent type urethane primer having a solid content of 40% by mass (Saraseine SP) based on an isocyanate-terminated prepolymer as a main component with respect to 100 parts by mass of an asphalt emulsion waterproof material. : Made by Asahi Glass Polyurethane Building Materials Co., Ltd.) Except for using 10 parts by mass (containing 6.2 parts by mass of the solid content of the urethane resin composition with respect to 100 parts by mass of the solid content of the asphalt emulsion waterproof material) A test specimen was prepared in the same manner as in Example 1.

Example 4
Instead of the waterproof adhesive layer (B), a test specimen having the configuration of FIG. 2 was prepared in the same manner as in Example 1 except that the primer layer (D) and the second waterproof layer (E) were sequentially formed by the following procedure. Created.

A primer layer (D) is applied by applying a moisture-curing solvent type urethane-based primer (Saracene SP: manufactured by Asahi Glass Polyurethane Building Materials Co., Ltd.) mainly composed of an isocyanate group-terminated urethane prepolymer using a roller at 0.15 kg per 1 m ^2. Formed.

After drying the primer layer (D) (1 hour after application), apply the asphalt emulsion waterproof material used in Example 1 on the primer layer (D) at a rate of 0.5 kg per m ² using a roller. A second waterproof layer (E) was formed to prepare a test specimen.

(Example 5)
A test specimen was prepared in the same manner as in Example 4 except that the asphalt emulsion waterproofing material was applied before drying the primer layer (D) (30 minutes after application).

(Example 6)
100 parts by mass of an epoxy primer main agent containing 40 parts by mass of a bisphenol A type epoxy resin, 100 parts by mass of an epoxy primer curing agent containing 8 parts by mass of an aliphatic polyamine (Sarasane PE-200: manufactured by Asahi Glass Polyurethane Building Materials Co., Ltd.) A primer layer (D) was formed by coating with 0.15 kg per m ² using a roller.

Before drying the primer layer (D) (30 minutes after application), on the primer layer (D), 6 parts by mass of a self-emulsifying type bisphenol A epoxy resin on the asphalt emulsion waterproof material used in Example 1, Except for mixing 4 parts by weight of aromatic polyamine resin, 15 parts by weight with respect to 100 parts by weight of the solid content of the asphalt emulsion waterproof material, and using a roller at 0.5 kg per 1 m ² , A test specimen was prepared in the same manner as in Example 4.

(Comparative Example 1)
A test specimen was prepared in the same manner as in Example 1 except that the waterproof adhesive layer (B) was formed by applying an asphalt emulsion waterproof material without mixing an epoxy resin.

(Comparative Example 2)
Waterproof adhesive (solid content of asphalt emulsion waterproof material) in which 0.3 part by weight of self-emulsifying bisphenol A type epoxy resin and 0.1 part by weight of aliphatic polyamine resin are mixed with 100 parts by weight of asphalt emulsion waterproof material A test specimen was prepared in the same manner as in Example 1 except that the waterproof adhesive layer (B) was formed using 100 parts by mass of the epoxy resin composition containing a solid content of 0.6 parts by mass.

(Comparative Example 3)
Waterproof adhesive (100 parts by mass of solid content of asphalt emulsion waterproof material) in which 60 parts by mass of self-emulsifying bisphenol A type epoxy resin and 25 parts by mass of aliphatic polyamine resin are mixed with 100 parts by mass of asphalt emulsion waterproof material On the other hand, a test specimen was prepared in the same manner as in Example 1 except that the waterproof adhesive layer (B) was formed using a solid content of 131 parts by mass of the epoxy resin composition.

Test example 1
The test specimens of Examples 1 to 6 and Comparative Examples 1 to 3 were cut to 100 × 100 mm, and a tensile adhesion test (tensile speed: 5 mm / min) using a Kenken type tensile adhesion tester (manufactured by Yamamoto Hajiki Co., Ltd.) Thus, the adhesive strength of the entire coating layer to the substrate (G) was measured. The results are shown in Table 1.

Test example 2
Asphalt concrete pavement with a thickness of 40 mm was placed on the specimens of Examples 1 to 6 and Comparative Examples 1 to 3, cut to 100 × 100 mm, and a tensile adhesion test (tensile speed of 5 mm / min) was performed. Asphalt pavement The adhesive strength of the waterproof adhesive layer (B) or the second waterproof layer with respect to the layer (C) was measured. The results are shown in Table 1.

  From the results of Table 1, it can be seen that in Examples 1 to 6, the adhesive strength is higher than those of Comparative Examples 1 to 3, and practically sufficient adhesive strength is obtained.

Test example 3
The waterproof layer (A) and the waterproof adhesive layer (B) of Example 1 were subjected to a tensile strength test specified in JIS-A6021, and the tensile strength and breaking strength were measured. The waterproof layer (A) was measured with a dumbbell-shaped No. 3 shape, and the waterproof adhesive layer (B) was measured with a dumbbell-shaped No. 2 test piece.

As a result, the waterproof layer (A) has a tensile strength of 12 N / mm ² and a breaking elongation of 600%, and the waterproof adhesive layer (B) has a tensile strength of 0.5 N / mm ² and a breaking elongation of 900%. It can also be seen that it has sufficient strength and elongation.

  INDUSTRIAL APPLICATION This invention can be utilized suitably as a waterproofing method at the time of placing asphalt concrete pavement on base | substrates, such as a floor slab waterproofing of a bridge.

It is sectional drawing which shows one Embodiment of the laminated structure formed by the 1st composite waterproofing method of this invention. It is sectional drawing which shows one Embodiment of the laminated structure formed by the 2nd composite waterproofing construction method of this invention.

Explanation of symbols

A: waterproof layer B: waterproof adhesive layer C: asphalt pavement layer D: primer layer E: second waterproof layer F: substrate primer layer G: substrate

Claims (6)

On the base, a waterproof layer (A) made of urethane waterproof material,
An asphalt emulsion waterproof material and a urethane resin composition and / or an epoxy resin composition, wherein the urethane resin composition and the epoxy resin composition are solid with respect to 100 parts by mass of the solid content of the asphalt emulsion waterproof material. A waterproof adhesive layer (B) made of a waterproof adhesive containing 1 to 100 parts by mass in terms of minutes;
A composite waterproofing method characterized by sequentially forming an asphalt pavement layer (C). On the base, a waterproof layer (A) made of urethane waterproof material,
A primer layer (D) comprising a urethane resin composition and / or an epoxy resin composition;
A second waterproof layer (E) made of an asphalt emulsion waterproof material;
A composite waterproofing method characterized by sequentially forming an asphalt pavement layer (C).   The composite waterproofing method according to claim 2, wherein the second waterproof layer (E) is formed before the primer layer (D) is cured.   The composite waterproofing method according to any one of claims 1 to 3, wherein the waterproof layer (A) is formed after the base primer layer (F) is formed on the base. The said waterproof layer (A) is formed so that the tensile strength in the tensile strength test prescribed | regulated to JIS-A6021 is 2.5 N / mm < ² > or more, and breaking elongation becomes 200% or more. The composite waterproof construction method as described in any one of these. The waterproof adhesive layer (B) or the second waterproof layer (the second waterproof layer) so that the tensile strength in the tensile strength test specified in JIS-A6021 is 0.25 N / mm ² or more and the elongation at break is 300% or more. The composite waterproofing method according to any one of claims 1 to 5, wherein E) is formed.

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