JP4380306B2 - Concrete floor structure and construction method thereof - Google Patents

Description

  The present invention relates to a concrete floor structure for a building having excellent interlaminar adhesion strength, particularly a public facility such as a hospital, a school, or a station, a convenience store, an apartment, and the like, and a construction method thereof.

Conventionally, in the construction field, in Patent Document 1, in order to obtain a floor surface without unevenness, after placing slab concrete, a mixed mortar is driven thereon to form a foundation, and then a self-leveling material is formed on the foundation. There is known a floor construction method that spreads.
In addition, in Patent Document 2, after placing a concrete floor, a primer treatment is performed thereon, a self-leveling material layer is further provided thereon, a drying inhibitor is applied thereon, and a floor surface using a finishing material is used. The finishing method is known.
Japanese Patent Publication No. 7-68757. JP 2003-213915 A.

However, in the construction method disclosed in the above example, the adhesive strength between the concrete surface and the primer may be insufficient, and a problem of blistering due to peeling occurs. As a result of this blistering, there is a problem that unevenness due to blistering occurs, a beautiful floor surface cannot be obtained, and the appearance of the floor surface is impaired.
In order to solve the above-mentioned problems, the present invention is a concrete having excellent surface appearance and adhesive strength between the layers constituting the floor by providing a cured layer of a self-leveling material having excellent surface appearance and adhesion strength on the floor surface. An object of the present invention is to provide a concrete floor structure excellent in surface appearance and its construction method without causing a problem of blistering due to peeling by obtaining a floor structure.

  As a result of intensive studies to achieve the above-mentioned problems, the inventors can obtain a floor having excellent adhesive strength by adopting a concrete floor structure having a specific layer structure and a construction method of the structure. I found out.

  The first of the present invention is at least (E) a concrete floor layer, (D) a cured product obtained by curing a mixture of concrete and an ethylene-vinyl acetate copolymer emulsion or higher alcohol, or an ethylene-vinyl acetate copolymer. A cured product layer obtained by curing a polymer emulsion or higher alcohol, (C) a cured product layer of an acrylic primer for self-leveling material, and (B) a cured product layer of cement-based self-leveling material, The (B) layer is laminated on the (C) layer, the (C) layer is laminated on the (D) layer, and the (D) layer is laminated on the (E) layer. A concrete floor structure is provided.

The concrete floor structure of the present invention is preferably a concrete floor structure of a building such as a public facility such as a hospital, a school, or a station, a convenience store, or an apartment.
In the concrete floor structure of the present invention, the primer for the self-leveling material of the cured product layer (C) is preferably an acrylic emulsion.
The cured product layer (D) of the concrete floor structure of the present invention is a cured product obtained by mixing 1 to 20% by weight of an ethylene-vinyl acetate copolymer emulsion or 0.1 to 10% by weight of a higher alcohol with concrete. Preferably there is.
In the concrete floor structure of the present invention, it is preferable that the (A) surface layer is provided on the (B) layer.

  In the second aspect of the present invention, concrete is placed on the floor surface, and an ethylene-vinyl acetate copolymer emulsion or higher alcohol is sprayed before the concrete is hardened, so that the concrete and the ethylene-vinyl acetate copolymer emulsion or higher alcohol are dispersed. A cured layer of a mixture, or a cured product layer obtained by curing an ethylene-vinyl acetate copolymer emulsion or higher alcohol is formed, and an acrylic primer for self-leveling material is applied on the formed polymer concrete layer, Then, the construction method of the concrete floor characterized by constructing a cement type self-leveling material is provided.

The concrete floor construction method of the present invention is preferably a concrete floor construction method for buildings such as hospitals, schools, public facilities such as train stations, convenience stores, and condominiums.
In the concrete floor construction method of the present invention, the primer for the self-leveling material is preferably an acrylic emulsion.
In the concrete floor construction method of the present invention, a hardened layer of a mixture of concrete and an ethylene-vinyl acetate copolymer emulsion or a higher alcohol has an ethylene-vinyl acetate copolymer emulsion of 1 to 20% by weight or higher alcohol on the concrete. A cured layer obtained by mixing 0.1 to 10% by weight is preferable.
In the concrete floor construction method of the present invention, it is preferable to construct a surface layer on the cured layer of the cement-based self-leveling material after the cement-based self-leveling material is applied.

  By adopting a specific structure, it has excellent adhesion strength between the concrete surface and the self-leveling material, so there is no problem of blistering due to peeling, and a beautiful floor with no irregularities on the floor surface. Since the surface can be formed, it is possible to process the floor structure having an excellent floor surface appearance. The obtained floor structure is optimal as a floor for public facilities such as hospitals, schools, dormitories, convenience stores, condominiums, and the like.

  The surface material of the (A) layer is a floor paint, a floor material sheet, a carpet, a flooring and the like. Floor material sheets, carpets, flooring, and the like are attached to the (B) layer with an adhesive. The floor coating is usually applied by applying directly on the layer (B).

  The (B) layer refers to a cured product layer of a cement-based self-leveling material. The cement-based self-leveling material used to form the layer is basically composed of a hydraulic component, a setting modifier, a water reducing agent, And a thickener composition. Examples of the hydraulic component used in the cement-based self-leveling material include alumina cement, Portland cement, gypsum, blast furnace slag, and the like.

  First, the hydraulic component will be described. Alumina cement is potentially hard. In addition, calcium sulfate aluminate hydrate is produced by the coexistence of sulfate such as gypsum, which not only accelerates initial curing and enables early opening, but also consumes a large amount of moisture in the cured body at an early stage. For this reason, the time required to shift to surface finishing material construction is shortened, and a cured body with less shrinkage is formed. Further, due to the presence of blast furnace slag having latent hydraulic properties, a decrease in the strength of the cured body over time, which is a drawback of the rear alumina cement, is also suppressed. Several types of alumina cements having different mineral compositions are known and commercially available, but the main component is monocalcium aluminate, and any commercially available product can be used regardless of the type.

  Portland cement is one of the important components in fast setting, and it promotes the formation of calcium sulfoaluminate hydrate together with alumina cement and gypsum, thereby extracting the potential fast setting of alumina cement. Portland cement includes ordinary portland cement, early-strength portland cement, ultra-early-strength portland cement, medium heat portland cement, low heat portland cement, sulfate-resistant portland cement, white portland cement, blast furnace cement, fly ash cement, silica Various mixed cements such as cement can be used alone or in combination of two or more.

  Gypsum is a component necessary for maintaining fast curing, quick drying, and dimensional stability after curing. In addition, gypsum can be used as a mixture of two or more types of gypsum, such as anhydrous, two-water, and half-water, regardless of the type. Since the blast furnace slag has a small drying shrinkage, it not only enhances the crack resistance of the cured body, but also has an effect of improving the strength of the cured body due to its latent hydraulic properties. Moreover, it has the effect of suppressing the strength reduction resulting from the transition of the alumina cement hydrate.

  As a setting speed adjusting agent, by adding a setting accelerator and a setting retarding agent in combination, for example, fluid retention that enables a pot life of 30 minutes or more, and subsequent quick curing, light walk on the same day In addition to ensuring fast-curing and quick-drying that allows finishing materials to be applied within 3 days, surface pulverization occurs due to wrinkles and bubble loss caused by slurry movement and surface drying, and poor surface hardening at low temperatures. The risk of cracking during condensation at high temperatures is reduced, and a cured body having good surface properties can be obtained. Furthermore, it is possible to achieve both the above-mentioned super-fast hardness, fluidity retention and excellent cured product properties in a wide range from low temperature to high temperature.

  Lithium salts that act as setting accelerators include inorganic acid salts such as lithium carbonate, lithium chloride, lithium sulfate, lithium hydroxide, lithium nitrate, and lithium oxalate, lithium acetate, lithium citrate, lithium tartrate, lithium malate, glycol Organic acid salts such as lithium acid can be mentioned.

  As a set retarder, a predetermined amount of carboxylic acid such as tartaric acid, citric acid, bicarbonate, malic acid, gluconic acid, phosphoric acid, or an alkali metal salt or alkaline earth salt thereof is added. It may be. It should be noted that if the amount added is large, fluidity may be deteriorated, poor curing may occur, or surface defects may occur due to the generation of breathing water.

  The most basic factor that a self-leveling material should have is high fluidity. It is necessary to lower the water / hydraulic component ratio in order to suppress material separation and obtain a high-strength cured body. However, in order to ensure high fluidity even if the water / hydraulic component ratio is lowered, water is reduced. It is necessary to add an agent. Commercially available products such as naphthalene-based, polycarboxylic acid-based, polyether-based, and melamine-based water reducing agents can be used regardless of their types.

  In order to suppress material separation to a sufficient level while ensuring high fluidity, it is preferable to add a thickener. As the thickening agent, celluloses such as methylcellulose and carboxymethylcellulose, proteins such as gelatin and bectin, water-soluble polymers such as polyethylene glycol, polyethylene oxide, polyacrylamide, and polyvinyl alcohol can be used.

  In the case of a cement-based self-leveling material prepared by blending the above hydraulic components, setting speed modifier, water reducing agent and thickener, it is excellent in fluidity, fast curing, and excellent curing characteristics. In this invention, it can use suitably. Moreover, what added an antifoamer, polymer emulsion, polymer resin powder, etc. can be used as needed. As the antifoaming agent, known materials such as synthetic materials such as silicon-based, alcohol-based, polyether-based, and fluorine-based materials or plant-derived natural materials can be used. The polymer emulsion can improve adhesion to the base concrete, crack resistance, and wear resistance of the cured body. Copolymers such as ethylene-vinyl acetate, styrene-butadiene, acrylonitrile-butadiene as polymer emulsion, or homopolymers such as polybutene, polyvinyl chloride, polyvinyl acetate, methyl (meth) acrylate, ethyl (meth) One or two or more kinds of (meth) acrylate compounds containing alkyl (meth) acrylates such as acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, and the like, and further copolymerizable with these monomers Commercially available and synthetic products such as acrylate resins copolymerized with vinyl compounds such as styrene, vinyl acetate and vinylidene chloride can be used regardless of the type. (Meth) acrylate means methacrylate and acrylate.

  For the cement-based serrated leveling material, a material to which fly ash, limestone powder, siliceous powder or the like is added as an extender can also be used. The effect of improving the fluidity can be obtained by adding the extender, but if the amount added is too large, the strength development will be reduced, so that sufficient attention should be paid to the amount added.

  It is preferable to use a cement-based self-leveling material with the addition of fine aggregate / extension material because it can be used to take advantage of its properties. As fine aggregate, quartz sand, river sand, sea sand and limestone sand can be used. In addition, it shows in the following Table 1 about one compounding example of each component of the cement-type self-leveling material which can be used for this invention. The amount of each component may be selected in consideration of construction conditions and the like. Of course, a commercially available cement-based self-leveling material may be used. However, it is preferable to select and use a material having a preferable blending ratio of each component after testing in advance for compatibility with other layers.

  (C) The acrylic primer for self-leveling material used for forming the layer is preferably an acrylic polymer having a glass transition temperature of −50 to −1 ° C., and 1 to 10 acrylic acid and / or methacrylic acid. Contains by weight. Other constituent components are acrylic acid ester and methacrylic acid ester, but it is preferable to copolymerize a compound having a plurality of functional groups in one molecule. Examples of the compound having a plurality of functional groups include trimethylolpropane trimethacrylate, glycidyl acrylate, glycidyl methacrylate, bisphenol A polyoxyethylene adduct diacrylate, bisphenol A polyoxyethylene adduct dimethacrylate, triallyl isocyanurate, N -Methylolacrylamide, N-methylolmethacrylamide, divinylbenzene and the like can be used, but N-methylolacrylamide, N-methylolmethacrylamide, and trimethylolpropane trimethacrylate are preferable. These compounds are preferably used in the range of 0.1 to 5% by weight in the polymer.

  Further, the polymer raw material is an amount of an unsaturated monomer other than the above, for example, styrenes such as styrene and α-methylstyrene, dienes such as butadiene and isoprene, vinyl acetate and propion in an amount within a range not impairing performance. Vinyl esters such as vinyl acid, and nitriles such as acrylonitrile and α-methylacrylonitrile may be used in combination. As the acrylic primer for the self-leveling material, commercially available products such as Ube Industries product U primer Q can be suitably used.

  The layer (D) is a layer formed by curing a mixture of concrete and ethylene-vinyl acetate copolymer emulsion or higher alcohol, and the concrete and ethylene-vinyl acetate copolymer emulsion are formed on the existing concrete surface. Or a layer formed by applying a mixture with higher alcohol (coating, spraying, spraying, etc.), placing concrete on the existing floor surface, and ethylene-vinyl acetate copolymer emulsion on the semi-cured concrete surface Or a layer formed by applying (coating, spraying, spraying, etc.) higher alcohol, placing concrete on the existing floor and applying ethylene-vinyl acetate copolymer emulsion or higher alcohol (coating, spraying, spraying) Etc.) and a cured layer formed by curing.

(D) The ethylene-vinyl acetate copolymer emulsion used for layer formation is obtained by emulsion polymerization of ethylene and vinyl acetate, and has a vinyl group copolymerizable with ethylene or vinyl acetate as other components. Aliphatic and aromatic compounds can be used.
(D) The ethylene-vinyl acetate copolymer emulsion used for layer formation does not contain an acrylic emulsion.

  In the ethylene-vinyl acetate copolymer emulsion, the protective colloid that stabilizes the micelles of the copolymer during emulsion polymerization of the monomer mixture of the constituent raw materials includes, for example, polyvinyl alcohol, protein, gelatin, It is desirable to use polyvinyl alcohol. One or two or more of these are used to emulsion polymerize the single-quantity mixture.

  The amount of the protective colloid is preferably 1 to 20 parts by weight with respect to 100 parts by weight of the raw material monomer mixture. If the amount is less than 1 part by weight, the polymer concrete layer is insufficiently formed due to agglomeration due to electrolyte ions, resulting in insufficient water retention on the concrete surface, and the emulsion of the emulsion polymer becomes unstable during storage and agglomerates. There are things to do. On the other hand, when the amount exceeds 20 parts by weight, the viscosity of the emulsion of the emulsion polymer increases, which may hinder the mixing workability with the concrete after the emulsion is sprayed.

  Examples of the polyvinyl alcohol include fully saponified polyvinyl alcohol, partially saponified polyvinyl alcohol, and anionized polyvinyl alcohol obtained by modifying a part of polyvinyl alcohol with a carboxyl group, a sulfonyl group, or the like. Either completely saponified or partially saponified polyvinyl alcohol can be used regardless of the type, but considering the emulsifying power during emulsion polymerization, those having a saponification rate of 70 to 100% and an average polymerization degree of 300 to 3000 are preferable. These 1 type or 2 or more types of mixtures are used in 1-20 weight part with respect to 100 weight part of raw material monomer mixtures.

  The copolymer is obtained by ordinary emulsion polymerization. At this time, examples of the emulsifier used in combination with the protective colloid include an anionic emulsifier, a nonionic emulsifier, a cationic emulsifier, and other reactive emulsifiers. However, it is usually preferable to use an anionic emulsifier and a nonionic emulsifier in combination.

  The amount of the emulsifier used is not particularly limited. However, in consideration of the amount of the copolymer to be obtained and the air entrainment amount, water retention, and workability of the concrete during construction, it is usually 0 with respect to the total amount of the monomer mixture. Used at about 1 to 8 parts by weight.

  As the polymerization initiator, any catalyst used in emulsion polymerization can be used, but representative examples include hydrogen peroxide, ammonium peroxide, potassium persulfate, sodium persulfate and the like. Water-soluble inorganic peroxides, organic peroxides such as cumene persulfate hydroperoxide and benzoyl peroxide, azo compounds such as azobisisobutylnitrile, etc., used as one or a mixture of two or more of these . It is preferable that the usage-amount is 0.1-2 weight part with respect to 100 weight part of a raw material monomer mixture.

  Needless to say, emulsion polymerization may be carried out by resox polymerization using the initiator together with a metal ion and a reducing agent. The raw material monomer mixture can be added dropwise in a solvent to which the initiator, the emulsifier and the protective colloid are added, in a batch or divided or continuously. The emulsion polymerization is preferably performed at a temperature of 30 to 90 ° C.

  The solvent is not particularly limited, but usually water is used. The viscosity of the emulsion obtained as a result of the emulsion polymerization is preferably 300 cps or less, and particularly preferably 100 cps or less from the viewpoint of workability in mixing with concrete after emulsion dispersion. When the viscosity of the emulsion after emulsion polymerization is high, the viscosity can be adjusted by adding a solvent.

  (D) The higher alcohol used for layer formation is an aliphatic alcohol having 10 or more carbon atoms, preferably 10 to 30 carbon atoms, such as 1-octadecanol.

In order to form a cured layer (D) of a mixture of concrete and an ethylene-vinyl acetate copolymer emulsion or a higher alcohol, the concrete is placed immediately after the concrete is cast and spread roughly on a flat surface with a trowel, rake, etc. It is preferable to spray the ethylene-vinyl acetate copolymer emulsion or higher alcohol during the half-curing. As for the application rate is not particularly limited, economy, in view of workability, construction plan 1 m ² per ethylene - in the range of 5~200g a solid component in terms of vinyl acetate copolymer emulsions, or higher alcohols preferable. More preferably, 50 to 130 g / m ² is applied. The method for spraying the ethylene-vinyl acetate copolymer emulsion or higher alcohol is not particularly limited, and can be performed using, for example, a sprinkler or a spray gun. In the ethylene-vinyl acetate copolymer emulsion or higher alcohol, for example, a film-forming auxiliary agent, an antifoaming agent, a preservative, a thickener, a water reducing agent, a freezing stabilizer, a water retention agent such as methylcellulose, and the like are added. Also good.

  At the time of construction of the concrete floor according to the present invention, immediately after the concrete layer (E) is placed on the floor surface and spread roughly on a flat surface with a trowel, rake, etc., at any time during which the concrete reaches semi-hardening, The ethylene-vinyl acetate copolymer emulsion or higher alcohol is sprayed, and the uncured concrete of the concrete layer and the ethylene-vinyl acetate copolymer emulsion or higher alcohol are surface-finished by rake, iron, etc. A vinyl acetate copolymer emulsion or higher alcohol and concrete are uniformly mixed to form a polymer concrete layer (D). For a predetermined period, for example, 1-3 days, or 1 month or more, an acrylic primer for self-leveling material is applied thereon to form a cured product layer (C) of the primer, and then left for 1-8 hours. A cement-based leveling material is applied thereon to form a hardened material layer (B) of the cement-based leveling material, and a surface layer (A) is further formed thereon if desired. The construction of the cement-based self-leveling material may be in accordance with a regular method, and is not limited to a specific method.

In addition, according to the construction method according to the present invention, after placing the concrete (E) layer on the floor surface, when a hardened layer made of a self-leveling material is formed on the polymer concrete layer (D), As demonstrated in the examples described later, an excellent effect that construction is possible is exhibited even after a considerable period of time has elapsed, for example, one month later. In that case, after forming the cured layer (C) layer made of an acrylic primer for a self-leveling material, curing may be performed for a desired period, and then the self-leveling material may be applied thereon.
In some cases, the construction method according to the present invention is also used for repairing a concrete floor that is formed by a conventional construction method and has a problem of blistering due to peeling due to insufficient adhesion strength between the concrete surface and the primer. You can also. In that case, all the layers formed on the surface of the concrete (E) layer are removed, the surface layer portion of the exposed concrete layer (E) layer is roughened as necessary, A thin layer of uncured concrete is newly provided, and then the ethylene-vinyl acetate copolymer emulsion or higher alcohol is sprayed, and the uncured concrete of the concrete layer and the ethylene-vinyl acetate copolymer emulsion or higher alcohol are dispersed. By finishing the surface with a rake, a trowel or the like, the ethylene-vinyl acetate copolymer emulsion or higher alcohol and concrete are uniformly mixed to form a polymer concrete layer (D). The subsequent process may follow the construction method according to the present invention.

  (E) About a layer, a concrete floor layer is a hardened | cured material layer of the concrete containing the mortar containing the small particle-type aggregate containing a well-known cement, and an aggregate.

  According to the construction method of the present invention, it can be used for concrete floors for buildings such as hospitals, schools, station buildings, and other public buildings, convenience stores, condominiums, etc., and in particular, an emulsion having a good affinity with concrete is uniform. Since it is mixed into polymer concrete, it has excellent interlayer adhesion strength with the primer material, so that the finished appearance of the concrete surface is also good.

EXAMPLES Hereinafter, although an Example demonstrates this invention concretely, this invention is not restrict | limited at all by the following examples.

The materials used for the self-leveling material are shown below, and the blending ratio is shown in Table 1.
(1) Materials used: The following materials were used.
Alumina cement: Blaine specific surface area 3,600 cm ² / g, monocalcium aluminate content 45% by weight.
Portland cement: Early-strength Portland cement, Blaine specific surface area of 4,500 cm ² / g.
Gypsum: type II anhydrous gypsum, Blaine specific surface area 3,300 cm ² / g.
Blast furnace slag: Blaine specific surface area 4,400 cm ² / g.
Silica sand: No. 4 silica sand (commercial product).
・ Lithium carbonate (commercially available).
-Sodium bicarbonate and sodium tartrate (both commercially available).
-Water reducing agent: Polycarboxylic acid water reducing agent (commercially available).
-Thickener: Methylcellulose thickener (commercially available).
-Antifoaming agent: Polyether type antifoaming agent (commercially available product).
U primer Q: Ube Industries product (acrylic resin emulsion).
Curing agent A: Aoi Chemical Industry Co., Ltd., hard coat CL-E-1, ethylene-vinyl acetate copolymer emulsion.
Curing Agent B: A solution diluted by adding 9 volumes of water to 1 volume of a stock solution of Shure Film (1-octadecanol) manufactured by Dayton.
Curing agent C: paraffin wax (master cure 106).

・ Adhesive strength test:
Evaluation of the adhesive strength between the concrete base (cured for 1 month) and the self-leveling material layer is performed according to JASS 15M-103.
As shown in FIG. 2, the surface of the self-leveling material is cut in a size of 40 × 40 mm until reaching the concrete base 7, and then an adhesive is applied to the surface of the self-leveling material layer 4. A tension jig 3 is placed and bonded. After standing for 24 hours, the tensile load at the time when the specimen was broken by applying a tensile force to the surface of the test body was defined as the maximum tensile load T (N), and the adhesive strength according to the following formula (1) σ is calculated. In this adhesive strength test, 6 samples are measured, and an average value is obtained.
The quality standard value of JASS 15M-103 is 14 N days and is 0.7 N / mm ² or more.

The bond strength σ (N / mm ² ) is calculated by the following formula (1).

[Example 1]
(1) Slurry preparation of self-leveling material Hydraulic components, fine aggregates, admixtures and setting modifiers (total amount: 1.5 kg) shown in Table 1 are kneaded using a chemistor, and a hydraulic composition A predetermined amount of water was added and kneaded for 3 minutes to obtain a slurry. The slurry was prepared under the conditions of a temperature of 20 ° C. and a humidity of 65%.

(2) Slurry physical properties and flow value of self-leveling material: Measured according to JASS 15M-103. A pipe made of vinyl chloride (internal volume: 100 ml) having an inner diameter of 50 mm and a height of 51 mm is placed on a polished glass plate having a thickness of 5 mm and filled with a kneaded slurry, and then the pipe is pulled up. After the spread has stopped, the diameters in two perpendicular directions are measured, and the average value is taken as the flow value. The flow value measured in this way was 220 mm.
The quality standard value of JASS 15M-103 is 190 mm or more.

Self-leveling property: Measured using a self-leveling property measuring instrument shown in FIG. The rail of the self-leveling property measuring device (width 30 mm x height 30 mm x length 750 mm) having the shape shown in Fig. 1 (a) is used in which a weir plate 1 is provided with a weir plate 1 at a length 150 mm from the tip. Then, as shown in FIG. 1B, a predetermined amount of the self-leveling material slurry 2 immediately after kneading is formed. As shown in FIG.1 (c), the weir board 1 is pulled up immediately after shaping | molding, and the slurry 2 is made to flow naturally. When the flow of the slurry stops, the distance from the gauge point (the installation part of the weir plate) to the shortest part of the slurry flow is measured, and the value (SL value) is defined as L0.
Similarly, as shown in FIG. 1 (d), the weir plate 1 is pulled up 30 minutes after molding, and after the flow of the slurry is stopped, from the gauge point (the installation portion of the weir plate) to the shortest portion of the slurry flow. The distance is measured, and the value (SL value) is L30. Thus, L0 was 510 mm and L30 was 515 mm.

(I) Formation of Concrete Floor (E) and Polymer Concrete Layer (D) The concrete floor was formed by using concrete made of ordinary cement having a nominal strength of 21 N / mm ² , a slump of 18 cm, a maximum aggregate diameter of 20 mm, and ordinary cement.
Ready-mixed concrete was placed on a wooden frame on the concrete floor with an inner diameter of 300 mm × 300 mm and a height of 200 mm. After wetting the surface of the ready-mixed concrete, curing agent A (170 g / m ² ) is sprayed, and then the gold trowel is pressed. It was cured for one month under conditions of a temperature of 20 ° C. and a humidity of 65%.

(Ii) Formation of acrylic primer hardened layer (C) for self-leveling material and cement-based self-leveling material layer (B) Polymer concrete layer (D) of concrete floor cured for one month after formation of polymer concrete layer (D) On the surface, a 6-fold solution of U primer Q (product of Ube Industries) (450 g / m ² of water was added to the stock solution 90 g / m ² ) was applied. When the primer became transparent, a 4-fold solution (270 g / m ² of water was added to the stock solution 90 g / m ² ) was further applied. After primer film formation, the slurry of the self-leveling material shown in Example 1 was poured to a thickness of 10 mm when dried, and the concrete floor structure was subjected to a temperature of 20 ° C. and a humidity of 65% for 14 days and 28 days. Cured.
Table 2 shows the results of the adhesive strength test between the concrete substrate (cured for 1 month) and the self-leveling material.

[Example 2]
(I) Formation of Concrete Floor (E) and Polymer Concrete Layer (D) Ready-mixed concrete was placed on a wooden frame having an inner diameter of 300 mm × 300 mm and a height of 200 mm on the concrete floor. After draining the surface of the ready-mixed concrete, curing agent B (136 ml / m ² ) is sprayed, and then the gold trowel is pressed. It was cured for one month under conditions of a temperature of 20 ° C. and a humidity of 65%. The concrete floor used was the same as in Example 1.

(Ii) Formation of acrylic primer cured layer (C) for self-leveling material and cement-based self-leveling material layer (B) It was formed in the same manner as in Example 1.
Table 2 shows the results of the adhesive strength test between the concrete substrate (cured for 1 month) and the self-leveling material.

[Comparative Example 1]
(I) Formation of concrete floor (E) and polymer concrete layer (D) Raw concrete was placed on a wooden frame on the concrete floor with an inner diameter of 300 mm x 300 mm and a height of 200 mm, and curing agent C (150 ml / m ² ) was sprayed. Thereafter, curing agent C (100 ml / m ² ) was further sprayed at the time of holding the gold trowel, and was cured for 1 month under the conditions of a temperature of 20 ° C. and a humidity of 65%. The concrete floor used was the same as in Example 1.

(Ii) Formation of acrylic primer cured layer (C) for self-leveling material and cement-based self-leveling material layer (B) It was formed in the same manner as in Example 1.
Table 2 shows the results of the adhesive strength test between the concrete substrate (cured for 1 month) and the self-leveling material.

  From the results shown in Table 2, it is clear that the concrete structure according to the present invention exhibits excellent adhesive strength. In Table 2, the base surface is the interface between the (C) layer and the (D) layer.

The concrete floor structure according to the present invention not only has an excellent adhesive strength itself, but also has an excellent adhesive strength even when one month has passed since the placement of ready-mixed concrete. The construction method of the concrete floor structure which can construct can be provided.
Therefore, there is substantially no problem of blistering due to peeling between the layers constituting the concrete floor structure, so that a beautiful floor surface can be obtained without unevenness on the floor surface, and the floor surface appearance is excellent. It is possible to provide an optimal structure as a floor of a public facility such as a hospital, a school, a station, a convenience store, an apartment, or the like.

(A)-(d) is drawing which illustrates the test method of a self-leveling property typically. It is drawing explaining typically the test method of an adhesive strength test.

Explanation of symbols

1: slurry plate, 2: slurry of self-leveling material, 3: jig for tension, 4: self-leveling layer, 5: primer hardened layer, 6: polymer concrete layer, 7: base (concrete floor), 8: notch.

Claims (7)

At least (E) concrete floor layer, (D) uncured concrete cast to form the concrete floor layer, or ethylene-vinyl acetate co-polymerized on the surface of uncured concrete cast on the existing concrete floor layer Cured product obtained by curing a mixture of concrete and ethylene-vinyl acetate copolymer emulsion or higher alcohol formed by spraying coalescence emulsion or higher alcohol, or ethylene-vinyl acetate copolymer emulsion or higher A layer of a cured product obtained by curing alcohol, (C) a cured product layer of an acrylic primer for self-leveling material, and (B) a cured product layer of cement-based self-leveling material, the layer (B) On the (C) layer, the (C) layer on the (D) layer, and the (D) layer on the (E) Concrete floor structures sequentially laminated comprising building up.   The concrete floor structure according to claim 1, wherein (A) a surface layer is provided on the (B) layer.   The concrete floor structure according to claim 1 or 2, wherein the building is a building of a hospital, a school, a public facility in a station, a convenience store, or a condominium.   4. The concrete floor structure according to claim 1, wherein the acrylic primer for self-leveling material of the cured product layer (C) is an acrylic emulsion.   The cured product layer (D) is a cured product obtained by mixing 1 to 20% by weight of an ethylene-vinyl acetate copolymer emulsion or 0.1 to 10% by weight of a higher alcohol with concrete. The concrete floor structure according to any one of claims 1 to 4.   It is obtained by placing concrete on the floor, spraying ethylene-vinyl acetate copolymer emulsion or higher alcohol before curing, and curing the mixture of concrete and ethylene-vinyl acetate copolymer emulsion or higher alcohol. A polymer concrete layer made of a cured product obtained by curing an ethylene-vinyl acetate copolymer emulsion or a higher alcohol, and an acrylic primer for self-leveling material is formed on the formed polymer concrete layer. A concrete floor construction method that includes construction and then cement-based self-leveling material.   The method for constructing a concrete floor according to claim 6, wherein after the cement-based self-leveling material is applied, a surface layer is further applied on the hardened material layer of the cement-based self-leveling material.

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