JP6725875B2 - Floor slab waterproof structure - Google Patents

Description

The present invention relates to a floor slab waterproofing structure having excellent interlayer adhesion of each layer.

In recent years, early deterioration of highway and other road bridge decks has become prominent due to increasing traffic loads and spraying of antifreezing agents. As a mechanism of this early deterioration, it is thought that rainwater, antifreezing agents, etc. enter the structure through the cracks in the asphalt pavement and the reinforced concrete floor slab and corrode the reinforcing bar, reducing the durability of the structure. Has been.

As a method of improving the durability of these road bridge decks, various floor deck waterproof structures in which a deck layer, a waterproof material layer, and an asphalt pavement layer are sequentially laminated have been studied.

As the floor slab waterproof structure, for example, a floor slab waterproof structure in which a floor slab layer, a urethane waterproof material layer, a urethane adhesive layer, and an asphalt pavement layer are sequentially laminated is disclosed (for example, Patent Document 1 See 1.). Although the urethane resin used in the waterproof material layer and the adhesive layer is inexpensive, it is widely used in Japan, but the drying property is slow and it is desired to shorten the construction period.

JP 2012-117368 A

The problem to be solved by the present invention is to provide a floor slab waterproof structure having a short construction time and excellent in interlayer adhesion between the floor slab layer, the waterproof material layer, and the asphalt pavement layer.

The present inventors, from the bottom, a floor slab layer, a floor slab primer layer that is a cured product of a specific composition, a urethane waterproof material layer, an adhesive layer that is a cured product of a specific composition, and an asphalt pavement layer are sequentially laminated. The inventors have found that the floor slab waterproofing structure has a short construction time and is excellent in adhesion between layers, and completed the present invention.

That is, in the present invention, the floor slab layer (A), the floor slab primer layer (B), the urethane waterproof material layer (C), the adhesive layer (D), and the asphalt pavement layer (E) are sequentially laminated from the bottom. In the floor slab waterproof structure, the floor slab primer layer (B) and the adhesive layer (D) are cured products of a radical curable compound (b1) and an urethane prepolymer (b2) having an isocyanate group. The present invention provides a floor slab waterproofing structure.

Since the floor slab waterproofing structure of the present invention uses the radical curable compound having excellent drying property as the floor slab primer layer and the adhesive layer, the construction time can be shortened. Further, the floor slab waterproof structure of the present invention is excellent in interlayer adhesion.

The floor slab waterproofing structure of the present invention is, from the bottom, a floor slab layer (A), a floor slab primer layer (B), a urethane waterproof material layer (C), an adhesive layer (D), and an asphalt pavement layer (E). In which the floor slab primer layer (B) and the adhesive layer (D) have a radical curable compound (b1) and an isocyanate group-containing urethane prepolymer (b2). It is a cured product of.

As the floor slab layer (A), for example, cement concrete, asphalt concrete, mortar concrete, resin concrete, water permeable concrete, ALC plate, PC plate, metal (steel material) or the like can be used. The shape may be a curved surface, an extension surface, a flat surface, an inclined surface, or the like.

Since the floor slab primer layer (B) and the adhesive layer (D) can impart quick-drying property and excellent adhesiveness to the urethane waterproof material layer (C), the radical curable compound (b1) and the urethane It is important that it is a cured product of the prepolymer (b2).

Examples of the radical-curable compound (b1) include radical-curable resins and radical-curable monomers such as urethane (meth)acrylate, epoxy (meth)acrylate, unsaturated polyester, and polyester (meth)acrylate. Can be used. These radical curable compounds (b1) may be used alone or in combination of two or more kinds.

As the radical curable compound (b1), the adhesiveness between the floor slab primer layer (B) and the urethane waterproof material layer (C), and the urethane waterproof material layer (C) and the adhesive layer (D) It is preferable to use urethane (meth)acrylate and epoxy (meth)acrylate because the adhesive property of is further improved, and it is more preferable to use a radical-curable monomer having a hydroxyl group in combination.

As the urethane (meth)acrylate, for example, one obtained by reacting a polyol, a polyisocyanate, and a (meth)acrylic compound having a hydroxyl group or an isocyanate group by a conventionally known method can be used.

As the polyol, for example, polyester polyol, polycarbonate polyol, polyether polyol, acrylic polyol, caprolactone polyol, butadiene polyol or the like can be used. These polyols may be used alone or in combination of two or more.

The number average molecular weight of the polyol is preferably in the range of 1,000 to 4,000 because the balance between curability and compatibility is further improved.

The average molecular weight in the present invention indicates a value measured by a gel permeation chromatography (GPC) method.

Examples of the polyisocyanate include aromatic diisocyanates such as phenylene diisocyanate, diphenylmethane diisocyanate, tolylene diisocyanate, and naphthalene diisocyanate; hexamethylene diisocyanate, lysine diisocyanate, cyclohexane diisocyanate, isophorone diisocyanate, 4,4′-dicyclohexylmethane diisocyanate, xylylene diisocyanate. Isocyanate, aliphatic or alicyclic diisocyanate such as tetramethyl xylylene diisocyanate; xylylene diisocyanate, tolylene diisocyanate, diphenylmethane diisocyanate, phenylene diisocyanate, polyphenylene polymethylene polyisocyanate, formalin condensate of methylene diphenyl disisocyanate, 4,4 An aromatic polyisocyanate such as a carbodiimide modified product of'-diphenylmethane diisocyanate can be used. These polyisocyanates may be used alone or in combination of two or more.

Examples of the (meth)acrylic compound having a hydroxyl group include 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 3-hydroxybutyl (meth)acrylate, and 4-hydroxybutyl (meth)acrylate. (Meth)acrylic acid alkyl ester having a hydroxyl group of polyethylene glycol monoacrylate, polypropylene glycol monoacrylate and the like can be used. These compounds may be used alone or in combination of two or more.

Examples of the (meth)acrylic compound having an isocyanate group include 2-(meth)acryloyloxyethyl isocyanate, 2-(2-(meth)acryloyloxyethyloxy)ethyl isocyanate, and 1,1-bis((meth)). Acryloyloxymethyl)ethyl isocyanate and the like can be used. These compounds may be used alone or in combination of two or more.

Examples of the epoxy (meth)acrylate include those obtained by reacting a bisphenol type epoxy compound or an epoxy compound obtained by mixing a bisphenol type epoxy compound and a novolac type epoxy compound with an unsaturated monobasic acid by a conventionally known method. Can be used.

Examples of the bisphenol-type epoxy compound include a glycidyl ether-type epoxy compound having two or more epoxy groups in one molecule obtained by a reaction of epichlorohydrin and bisphenol A or bisphenol F, methyl epichlorohydrin and bisphenol A or bisphenol F, and It is possible to use a dimethylglycidyl ether type epoxy compound obtained by reacting the above, an epoxy compound obtained by reacting an alkylene oxide adduct of bisphenol A with epichlorohydrin or methylepichlorohydrin, and the like. These epoxy compounds may be used alone or in combination of two or more kinds.

As the novolac type epoxy compound, for example, an epoxy compound obtained by reacting phenol novolac or cresol novolac with epichlorohydrin or methyl epichlorohydrin can be used. These epoxy compounds may be used alone or in combination of two or more kinds.

As the unsaturated monobasic acid, for example, (meth)acrylic acid, cinnamic acid, crotonic acid, monomethylmalate, monopropylmalate, monobutenemalate, sorbic acid, mono(2-ethylhexyl)malate, etc. are used. be able to. These unsaturated monobasic acids may be used alone or in combination of two or more kinds.

In addition, the molecular weight of the radical-curable resin is the adhesiveness between the floor slab primer layer (B) and the urethane waterproof material layer (C), and the urethane waterproof material layer (C) and the adhesive layer (D). From the standpoint of further improving the adhesiveness, the range of 500 to 5,000 is more preferable, and the range of 1,000 to 3,000 is more preferable.

Examples of the radical-curable monomer having a hydroxyl group include 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 3-hydroxybutyl (meth)acrylate, and 4-hydroxybutyl (meth)acrylate. And the like, 2-hydroxyethyl (meth)acrylate and 2-hydroxypropyl (meth)acrylate are preferable, and 2-hydroxyethyl (meth)acrylate is more preferable because curability is further improved. These monomers may be used alone or in combination of two or more.

Examples of the radical-curable monomer other than the radical-curable monomer having a hydroxyl group include, for example, methyl (meth)acrylate, ethyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, t-butyl (meth)acrylate, hexyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, n-octyl (meth)acrylate, decyl (meth)acrylate, β-ethoxyethyl (meth)acrylate, 2-cyanoethyl (meth) ) Acrylate, cyclohexyl (meth)acrylate, diethylaminoethyl (meth)acrylate, lauryl (meth)acrylate, stearyl (meth)acrylate, polycaprolactone (meth)acrylate, diethylene glycol monomethyl ether mono (meth)acrylate, dipropylene glycol monomethyl ether mono (Meth)acrylic monomers such as (meth)acrylate, 2-ethylhexylcarbitol (meth)acrylate, tris(2-hydroxyethyl)isocyanuric (meth)acrylate; dicyclopentenyloxyethyl (meth)acrylate, dicyclopentenyl A (meth)acrylic monomer having a boiling point of 100° C. or higher such as (meth)acrylate or phenoxyethyl (meth)acrylate can be used. These monomers may be used alone or in combination of two or more.

As the urethane prepolymer (b2), those obtained by reacting a polyol with a polyisocyanate by a known method can be used.

As the polyol that is a raw material of the urethane prepolymer (b2), various types of polyols described above as the polyol that can be used as a raw material of the urethane (meth)acrylate can be used. These polyols may be used alone or in combination of two or more.

The number average molecular weight of the polyol is preferably in the range of 1,000 to 5,000 from the viewpoint of compatibility with the radical curable compound (b1) and imparting toughness.

As the polyisocyanate as the raw material of the urethane prepolymer (b2), various polyisocyanates described above as the polyisocyanate that can be used as the raw material of the urethane (meth)acrylate can be used. Among these, polyphenylene polymethylene polyisocyanate is preferable because the reactivity with urea urethane and the adhesiveness are further improved. These polyisocyanates may be used alone or in combination of two or more.

The isocyanate group content (hereinafter abbreviated as “NCO %”) of the urethane prepolymer (b2) is in the range of 10 to 30 mass% because the balance between interlayer adhesion and storage stability is further improved. It is preferable.

The mass ratio (b1/b2) between the radical-curable compound (b1) and the urethane prepolymer (b2) in the floor slab primer layer (B) and the adhesive layer (D) is such that interlayer adhesion and storage stability are obtained. The range of 100/10 to 100/60 is preferable because the balance of properties is further improved.

The floor slab primer layer (B) is formed from a composition for a floor slab primer layer (B) containing the radical curable compound (b1) and the urethane prepolymer (b2) as essential components, The adhesive layer (D) is formed from a composition for an adhesive layer (D) containing the radical curable compound (b1) and the urethane prepolymer (b2) as essential components.

The composition for the floor slab primer layer (B) and the composition for the adhesive layer (D) may contain other resin components such as an acrylic polymer and additives as other components.

Examples of the additive include a curing agent, a curing accelerator, a polymerization inhibitor, a pigment, a thixotropic agent, an antioxidant, a solvent, a filler, a reinforcing material, an aggregate, a flame retardant, and petroleum wax. ..

As the urethane waterproof material layer (C), a known urethane waterproof material composition can be used. For example, a two-component type containing a main agent containing a urethane prepolymer having an isocyanate group and a curing agent. Urethane composition: A moisture-curable urethane composition containing a urethane prepolymer having an isocyanate group can be used.

The urethane prepolymer contained in the two-pack type urethane composition is obtained by a conventionally known method using a polyol and a polyisocyanate.

As the polyol, for example, polyether polyol, polyester polyol, polycarbonate polyol, polybutadiene polyol, polyacrylic polyol, polyisoprene polyol or the like can be used. These polyols may be used alone or in combination of two or more.

Examples of the polyisocyanate include 2,4′-diphenylmethane diisocyanate, 4,4′-diphenylmethane diisocyanate, a mixture of 2,4′-diphenylmethane diisocyanate and 4,4′-diphenylmethane diisocyanate, toluene diisocyanate, and xylylene diisocyanate. Can be used. These polyisocyanates may be used alone or in combination of two or more. Among these, 4,4'-diphenylmethane diisocyanate is preferably used because the high strength can be further improved.

Examples of the curing agent that can be used include aromatic amine compounds; aliphatic amine compounds; diol compounds such as ethylene glycol, propylene glycol, dipropylene glycol; polyether polyols, aminated polyols, and the like. These curing agents may be used alone or in combination of two or more kinds. Among these, it is preferable to use an aromatic amine compound and/or an aliphatic amine compound from the viewpoint that the high strength can be further improved.

The urethane prepolymer contained in the two-pack type urethane composition may be reacted with a carbodiimide compound, if necessary.

The NCO% of the urethane prepolymer contained in the two-pack type urethane composition is preferably in the range of 5 to 40% by mass, and more preferably 10 to 30% by mass, from the viewpoint that high strength can be further improved. The range is more preferably.

Examples of the moisture-curable urethane composition include a urethane prepolymer having an isocyanate group obtained by reacting a polyol containing a polytetramethylene glycol and a chain extender with a polyisocyanate, a polyol, a polyisocyanate, and N-2. A urethane compound having an oxazolidine group obtained by reacting with -hydroxyalkyloxazolidine, and a moisture-curable urethane composition containing an acid catalyst can be used.

The asphalt pavement layer (E) is formed by various asphalts. As the asphalt, for example, straight asphalt, blown asphalt, cat asphalt, Trinidat asphalt, rake asphalt and the like can be used.

Next, a method for manufacturing the floor slab waterproof structure of the present invention will be described.

First, the composition for the floor slab primer layer (B) can be applied onto the floor slab layer (A) by a method such as spray coating, roller coating, brush coating, and trowel coating. The coating amount is, for example, in the range of 0.05 to ² kg/m ² . After the application, for example, it can be aged at room temperature for 0.5 to 2 hours. The urethane composition forming the urethane waterproof material layer (C) is applied or sprayed. As a method of applying or spraying the urethane composition, for example, spray application, roller application, brush application, trowel application, or the like can be used. The coating amount of the urethane composition is, for example, in the range of 0.5 to 3 kg/m ² . After the application or spraying, it is preferable to cure at room temperature for 1 to 6 hours, for example.

Next, the composition for the adhesive layer (D) is applied onto the urethane waterproof material layer (C) by a method such as spray application, roller application, brush application, and trowel application. The coating amount of the composition for the adhesive layer (D) is, for example, in the range of 0.5 to 3 kg/m ² . After the application, for example, it can be aged at room temperature for 0.5 to 2 hours.

Next, the asphalt may be compacted onto the adhesive layer (D) and then compacted by heating at 60 to 120° C., for example. After the heating and compaction, the mixture may be cooled to room temperature and sprinkled with water if necessary to promote solidification.

The floor slab waterproofing structure of the present invention obtained by the above method has excellent interlayer adhesion. Further, since the radical-curable compound having excellent drying property is used as the floor slab primer layer and the adhesive layer, the construction time can be shortened.

Hereinafter, the present invention will be described in more detail with reference to specific examples. The average molecular weight is measured under the following GPC measurement conditions.

[GPC measurement conditions]
Measuring device: High-speed GPC device ("HLC-8220GPC" manufactured by Tosoh Corporation)
Column: The following columns manufactured by Tosoh Corporation were connected in series and used.
"TSKgel G5000" (7.8 mm ID x 30 cm) x 1 "TSK gel G4000" (7.8 mm ID x 30 cm) x 1 "TSK gel G3000" (7.8 mm ID x 30 cm) x 1 This "TSKgel G2000" (7.8 mm ID x 30 cm) x 1 Detector: RI (differential refractometer)
Column temperature: 40°C
Eluent: Tetrahydrofuran (THF)
Flow rate: 1.0 mL/min Injection volume: 100 μL (tetrahydrofuran solution with sample concentration 4 mg/mL)
Standard sample: A calibration curve was prepared using the following monodisperse polystyrene.

(Monodisperse polystyrene)
Tosoh Corporation "TSKgel Standard Polystyrene A-500"
Tosoh Corporation "TSK gel standard polystyrene A-1000"
Tosoh Corporation "TSK gel standard polystyrene A-2500"
Tosoh Corporation "TSK gel standard polystyrene A-5000"
"TSK gel standard polystyrene F-1" manufactured by Tosoh Corporation
"TSK gel standard polystyrene F-2" manufactured by Tosoh Corporation
"TSK gel standard polystyrene F-4" manufactured by Tosoh Corporation
Tosoh Corporation "TSK gel standard polystyrene F-10"
Tosoh Corporation "TSK gel standard polystyrene F-20"
Tosoh Corporation "TSK gel standard polystyrene F-40"
Tosoh Corporation "TSK gel standard polystyrene F-80"
Tosoh Corporation "TSK gel standard polystyrene F-128"
Tosoh Corporation "TSK gel standard polystyrene F-288"
Tosoh Corporation "TSK gel standard polystyrene F-550"

(Synthesis Example 1: Synthesis of radical curable resin (b1-1))
A four-necked flask equipped with a thermometer, a stirrer, an inert gas inlet and a reflux condenser was charged with 270 parts by mass of water, 1980 parts by mass of dicyclopentadiene, 0.5 parts by mass of hydroquinone, and 1370 parts by mass of maleic anhydride. The reaction was carried out at 80° C. for 4 hours under a nitrogen stream. When the acid value became 210, 450 parts by mass of ethylene glycol was charged and reacted at 200° C. for 6 hours to obtain an unsaturated polyester having an acid value of 8 and having dicyclopentadienyl groups at both ends. This unsaturated polyester is used as a radical curable resin (b1-1).

(Synthesis Example 2: Synthesis of radical curable resin (b1-2))
Epoxy resin obtained by reaction of bisphenol A and epichlorohydrin (“Epiclon 850” manufactured by DIC Corporation) in a four-necked flask equipped with a thermometer, a stirrer, an inert gas inlet and a reflux condenser, 1850 parts by mass, methacryl 860 parts by mass of acid, 1.36 parts by mass of hydroquinone and 10.8 parts by mass of triethylamine were charged, the temperature was raised to 120° C., and the reaction was carried out for 10 hours at the same time to obtain an epoxy methacrylate having an acid value of 3.5. This epoxy methacrylate is used as a radical curable resin (b1-2).

(Synthesis Example 3: Synthesis of radical curable resin (b1-3))
In a four-neck flask equipped with a thermometer, a stirrer, an inert gas inlet, an air inlet, and a reflux condenser, 500 parts by mass of polypropylene glycol (hereinafter abbreviated as "PPG") having a number average molecular weight of 1000 and tolylene diisocyanate. (Hereinafter, abbreviated as “TDI”.) 172 parts by mass were charged and reacted at 80° C. for 2 hours under a nitrogen stream. Since the NCO equivalent was 600, which was almost the theoretical equivalent value, it was cooled to 50°C. Hydroquinone (0.07 parts by mass) was added under an air stream, and 135 parts by mass of 2-hydroxyethyl methacrylate (hereinafter, abbreviated as "HEMA") was added and reacted at 90°C for 4 hours. When the NCO% reached 0.1% by mass or less, 0.07 parts by mass of tertiary butyl catechol (hereinafter abbreviated as "TBC") was added to obtain a urethane methacrylate having a number average molecular weight of 1582. This urethane methacrylate is used as a radical curable resin (b1-3).

(Synthesis Example 4: Synthesis of urethane prepolymer (b2-1))
In a four-necked flask equipped with a thermometer, a stirrer, an inert gas inlet, an air inlet and a reflux condenser, polyphenylene polymethylene polyisocyanate ("Millionate MR-200" manufactured by Tosoh Corporation) 200 parts by mass, number average molecular weight 2000 110 parts by mass of polypropylene glycol and 50 parts by mass of polypropylene glycol having a number average molecular weight of 3000 are charged and reacted at 80° C. for 5 hours under a nitrogen stream to obtain a urethane prepolymer (b2-1) having an NCO% of 16.0% by mass. It was

(Synthesis Example 5: Synthesis of moisture-curable urethane (PU-1))
In a four-necked flask equipped with a thermometer, a stirrer, an inert gas inlet, an air inlet, and a reflux condenser, polyphenylene polymethylene polyisocyanate (“Millionate MR-200” manufactured by Tosoh Corporation) 300 parts by mass, number average molecular weight 700. 210 parts by mass of polypropylene glycol, 474 parts by mass of toluene, and 474 parts by mass of ethyl acetate are charged and reacted at 80° C. for 5 hours under a nitrogen stream to obtain a moisture-curable urethane (PU-1) having an NCO% of 5.2% by mass. Got

(Preparation Example 1: Preparation of composition for floor plate primer layer (B-1))
20 parts by mass of radical curable compound (b1-1), 15 parts by mass of radical curable compound (b1-2), 15 parts by mass of radical curable compound (b1-3), methyl methacrylate (hereinafter abbreviated as "MMA"). ) 45 parts by mass, HEMA 5 parts by mass, urethane prepolymer (b2-1) 40 parts by mass, 130°F paraffin WAX 0.2 parts by mass, curing accelerator ("RP-191" manufactured by DIC Material Co., Ltd.) 1 0.0 parts by mass, 0.5% by mass of 8% cobalt octylate, and 2 parts by mass of 40% benzoyl peroxide were mixed to prepare a composition for floor plate primer layer (B-1).

(Preparation Example 2: Preparation of composition for floor plate primer layer (B-2))
A resin composition for a floor plate primer layer (B-2) was prepared in the same manner as in Preparation Example 1 except that 40 parts by mass of the urethane prepolymer (b2-1) used in Preparation Example 1 was changed to 20 parts by mass. did.

(Preparation Example 3: Preparation of composition for floor plate primer layer (RB-1))
A composition for a floor plate primer layer (RB-1) was prepared in the same manner as in Preparation Example 1 except that the urethane prepolymer (b2-1) used in Preparation Example 1 was not added.

(Preparation Example 4: Preparation of composition for urethane waterproof material layer (C-1))
[Preparation of urea urethane base]
In a four-necked flask equipped with a thermometer, a stirrer, an inert gas inlet, an air inlet, and a reflux condenser, 600 parts by mass of polypropylene glycol having a number average molecular weight of 1000, 180 parts by mass of polypropylene glycol having a number average molecular weight of 3000, and diethyltoluene 200 parts by mass of diamine and 10 parts by mass of 1,4-butanediol were charged to obtain a urea urethane main agent.

[Synthesis of urea urethane curing agent]
In a four-necked flask equipped with a thermometer, a stirrer, an inert gas inlet, an air inlet and a reflux condenser, 130 parts by mass of polypropylene glycol having a number average molecular weight of 1000 and 350 parts by mass of ethylene oxide modified polypropylene glycol having a number average molecular weight of 3000. 65 parts by mass of polypropylene glycol having a number average molecular weight of 2000 and 340 parts by mass of diphenylmethane diisocyanate were charged and reacted at 80° C. for 5 hours under a nitrogen stream to obtain a urea urethane curing agent having an NCO% of 13.5% by mass.

100 parts by mass of the urea urethane base compound obtained above and 100 parts by mass of the urea urethane curing agent were mixed to prepare a composition for urethane waterproof material layer (C-1).

(Composition for urethane waterproof material layer (C-2))
An ultra-fast curing two-component urethane composition by spray coating was used as a composition for urethane waterproof material layer (C-2). The cured product of the present composition has a tensile strength (test temperature 23° C.) of 10 N/mm ² or more measured according to JIS A6021:2011 and an elongation at break (test temperature 23° C.). It is 200% or more.

(Composition for adhesive layer (D-1))
The composition for floor slab primer layer (B-1) obtained in Preparation Example 1 was used as a composition for adhesive layer (D-1).

((D-2) composition for adhesive layer)
The composition for floor slab primer layer (B-2) obtained in Preparation Example 2 was used as a composition for adhesive layer (D-2).

(Composition for adhesive layer (RD-1))
The composition for floor plate primer layer (RB-1) obtained in Preparation Example 3 was used as a composition for adhesive layer (RD-1).

(Example 1: Preparation and evaluation of floor slab waterproof structure (1))
0.2 kg/m ^{2 of the} composition for floor slab primer layer (B-1) obtained in Preparation Example 1 was applied onto a concrete plate (25 mm×50 mm×50 mm), left standing at 23° C. for a specified time, and then ground A primer layer was prepared. Then, 2 kg/m ^{2 of the} composition for urethane waterproof material layer (C-1) obtained in Preparation Example 4 was applied and left at 23° C. for a specified time to prepare a urethane waterproof material layer. Then, 1 kg/m ^{2 of the} composition for adhesive layer (D-1) obtained in Preparation Example 5 was applied and left standing at 23° C. for a specified time to prepare a methacrylic resin adhesive layer. Then, 0.5 kg/m ^{2 of} asphalt emulsion (“HIBLOWN SA” manufactured by Showa Bitumen Industry Co., Ltd.) was applied and left at 23° C. for a prescribed time. After that, asphalt mixture (“Mild Patch” manufactured by Maeda Road Co., Ltd., abbreviated as “AS-1” hereinafter) was compacted at 23° C. with a thickness of 14 mm. Then, the test piece was left in a 110° C. high temperature dryer for 30 minutes to further transfer the asphalt mixture in a hot state. After the completion of the compaction, the floor slab waterproof structure (1) was obtained by allowing to cool to room temperature and further sprinkling water. Here, the specified time is the time until each layer is cured and dried, and the curing and drying time of each layer is free from stickiness due to touch drying, and a person can step on and work in the next step. It's time to go. The same applies to other examples and comparative examples.

[Evaluation of construction time]
The construction time was evaluated based on the total curing and drying time of each layer.

[Evaluation of interlayer adhesion (uniaxial tensile test)]
The uniaxial tensile strength of the floor slab waterproofing structure (1) obtained above was measured according to the tensile adhesion test described on page 128 of "Road Bridge Floor Waterproofing Handbook" (Japan Road Association). Further, the fractured state after the test was visually observed, and the interlayer adhesion was evaluated according to the following criteria. As the tester, "Autograph AG-X" manufactured by Shimadzu Corporation was used.
○: Material destruction ×: Delamination

[Evaluation of interlayer adhesion (floor slab primer layer/urethane waterproof material layer)]
The composition for the floor plate primer layer (B-1) was roller-coated (about 0.2 mm thick) on a slate substrate and cured at 23° C., and then on the floor plate primer layer (B-1). The composition for urethane waterproof material layer (C-1) was applied with a gold trowel in a thickness of about 2.0 mm and cured at 23° C. A peel was inserted between the two layers, and the interlayer adhesion was evaluated according to the following criteria.
○: Material destruction ×: Delamination

[Evaluation of interlayer adhesiveness (urethane waterproof material layer/adhesive layer)]
The composition for urethane waterproof material layer (C-1) obtained above was spray-coated to obtain a urethane waterproof material layer sheet (C-1) having a thickness of about 2 mm under the condition of 23°C. The composition for the adhesive layer (D-1) was roller coated (about 1 mm thick) on this sheet and cured at 23°C. A peel was inserted between the two layers, and the interlayer adhesion was evaluated according to the following criteria.
○: Material destruction ×: Delamination

(Example 2: Preparation and evaluation of floor slab waterproof structure (2))
The composition (B-1) for floor slab primer layer used in Example 1 was changed to the composition (B-2) for floor slab primer layer, and the composition (C-1) for urethane waterproof material layer was urethane waterproof. The same operation as in Example 1 was carried out except that the material layer composition (C-2) was changed and the adhesive layer composition (D-1) was changed to the adhesive layer composition (D-2). The floor slab waterproofing structure (2) was prepared, and the construction time and the interlayer adhesion were evaluated.

(Comparative Example 1: Preparation and evaluation of floor slab waterproof structure (R1))
The composition (B-1) for floor slab primer layer used in Example 1 was changed to the composition (RB-1) for floor slab primer, and the composition (D-1) for adhesive layer was used for the adhesive layer. A floor slab waterproof structure (R1) was produced in the same manner as in Example 1 except that the composition (RD-1) was used, and the construction time and the interlayer adhesion were evaluated.

(Comparative Example 2: Preparation and evaluation of floor slab waterproof structure (R2))
The composition (B-1) for floor slab primer layer used in Example 1 was changed to the composition (RB-1) for floor slab primer layer, and the composition (C-1) for urethane waterproof material layer was urethane waterproof. The same operation as in Example 1 was carried out except that the material layer composition (C-2) was changed and the adhesive layer composition (D-1) was changed to the adhesive layer composition (RD-1). A floor slab waterproofing structure (R2) was prepared, and the construction time and interlayer adhesion were evaluated.

(Comparative Example 3: Preparation and evaluation of floor slab waterproof structure (R3))
0.2 kg/m ^{2 of} the moisture-curable urethane (PU-1) obtained in Synthesis Example 5 was applied on a concrete plate (25 mm×50 mm×50 mm) and left at 23° C. for a specified time to form a base primer layer. It was made. Next, the urethane waterproof material layer composition (C-1) obtained in Preparation Example 4 was applied at ² kg/m ² and left at 23° C. for a specified time to prepare a urethane waterproof material layer. Thereafter, 0.2 kg/m ^{2 of} the moisture-curable urethane (PU-1) obtained in Synthesis Example 5 was applied and left at 23° C. for a specified time to prepare a urethane primer layer. Further, 1 kg/m ^{2 of} the adhesive layer composition (RD-1) obtained in Preparation Example 5 was applied and left standing for 23 hours at 23° C. to prepare a methacrylic resin adhesive layer. Then, 0.5 kg/m ^{2 of} asphalt emulsion (“HIBLOWN SA” manufactured by Showa Bitumen Industry Co., Ltd.) was applied and left at 23° C. for a prescribed time. After that, asphalt mixture (“Mild Patch” manufactured by Maeda Road Co., Ltd., abbreviated as “AS-1” hereinafter) was compacted at 23° C. with a thickness of 14 mm. Then, the test piece was left in a 110° C. high temperature dryer for 30 minutes to further transfer the asphalt mixture in a hot state. After the completion of the compaction, the floor slab waterproof structure (R3) was obtained by allowing to cool to room temperature and further sprinkling water.

Table 1 shows the layer structures and evaluation results of the floor slab waterproofing structures (1) to (2) and (R1) to (R3) obtained above.

It was confirmed that the floor slab waterproofing structures of the present invention of Examples 1 and 2 were excellent in interlayer adhesion. Moreover, the construction was possible in a short time.

On the other hand, Comparative Examples 1 and 2 are examples in which the floor slab primer layer and the adhesive layer do not contain the urethane prepolymer (b2) having an isocyanate group, but both layers have interlayer adhesiveness with the urethane waterproof material layer. It was bad.

Comparative Example 3 is an example in which moisture-curable urethane was used for the floor slab primer layer and the urethane primer layer in order to improve the interlayer adhesion, but it took a long time for the construction.

Claims (3)

Floor slab waterproof structure in which a floor slab layer (A), a floor slab primer layer (B), a urethane waterproof material layer (C), an adhesive layer (D), and an asphalt pavement layer (E) are sequentially laminated from the bottom. The floor slab primer layer (B) and the adhesive layer (D) are cured products of a radical curable compound (b1) and a urethane prepolymer (b2) having an isocyanate group. Floor slab waterproof structure. The floor slab waterproofing structure according to claim 1, wherein a mass ratio (b1/b2) of the radical-curable compound (b1) and the urethane prepolymer (b2) is in the range of 100/10 to 100/60. The floor slab waterproofing structure according to claim 1 or 2, wherein the urethane prepolymer (b2) has an isocyanate group content of 10 to 30% by mass.