JP5093500B2 - Concrete floor structure and construction method thereof - Google Patents

Description

The present invention relates to a method for constructing a concrete floor structure that is constructed by combining a self-leveling material and a coating floor material on a concrete floor of a building, and the concrete floor structure.

In buildings such as offices and offices, factories and warehouses, in general, various resin-based coating materials and various polymer cement-based coating materials are often used for finishing concrete floors. When the material is used as a finishing material for a concrete floor, an effect of improving the wear resistance and chemical resistance of the floor surface can be obtained.
As the foundation layer construction method in the case of constructing these coating floor materials, there are a concrete direct pressing method and a splicing method using mortars, self-leveling materials and the like.

In Patent Document 1, when a coating floor material is applied to the upper surface of a concrete floor, the coating layer cured layer of the coating floor material containing various resins may be generated due to poor air permeability. As a method to prevent swelling of the cured coating layer, use a mortar with self-leveling properties on the concrete base surface to transfer a single layer with air permeability, onto this non-breathable floor finish Has disclosed a method of dissipating moisture inside the foundation concrete structure to the ventilation layer located under the non-breathable floor finish.

  Further, in Patent Document 2, cement, aggregate, and water retention agent are the main components as a floor base material, and vinyl acetate resin, vinyl versatate resin, vinyl acetate-vinyl versatate copolymer, ethylene-acetic acid are used as synthetic resins. Self-leveling material containing one or a mixture of two or more of vinyl copolymer, acrylic resin, vinyl acetate-acrylic acid copolymer, vinyl acetate-vinyl versatate-acrylic acid ester copolymer, SBR is used. After the self-leveling material is applied, the synthetic resin collects on the surface during drying and cures in that state, resulting in excellent self-leveling properties and a close-to-mirror surface density. It is described that the surface state of can be obtained. In addition, it is easy to use this self-leveling material on a concrete, wood or metal base, and then apply the floor to the upper surface of the base and use it. Therefore, it is disclosed that the efficiency of the work of attaching the flooring with adhesive at the time of refurbishment and the like is remarkably improved, and the working time is greatly shortened.

Japanese Patent Laid-Open No. 2001-3551 JP 2003-20263 A

In general, when a concrete floor is finished by applying a coating floor material, a primer layer for the coating floor material is provided on the surface of the concrete floor, and a base coating layer for the coating floor material and a top coating layer for the coating floor material are applied. Moreover, when special function provision is not calculated | required, the topcoat layer for coating floor materials may not be constructed.
By selecting the type of flooring material, a concrete floor structure with functions such as overload resistance, abrasion resistance, impact resistance, water resistance, chemical resistance, weather resistance, aesthetics, and soundproofing is formed. it can.
These various functions obtained by applying the flooring material depend largely on the properties of the hardened layer of the flooring material basecoat, that is, the thickness and uniformity of the hardened layer of the flooring material basecoat. In addition, the properties of the coated floor base coat hardened layer are greatly influenced by the properties of the concrete surface forming the foundation.

Normally, the concrete floor of a new building is casted and compacted with ready-mixed concrete to give a certain level of flatness, and then the surface of the concrete is leveled with a plasterer when the water on the concrete surface is drawn. The surface of the hardened concrete floor was hardened by curing the rough unevenness, curing the concrete, and a wide variety of small unevenness and subtle slopes were involved in the surface of the hardened concrete floor. It is in a state.
In addition, when renovating the concrete floor of an existing building, the painted floor material and pasted floor material that were originally constructed were removed, and the concrete floor surface was ground to roughen rough irregularities. In this case, the surface of the entire concrete floor is in a state of being complicated with various small irregularities and subtle slopes.

As shown in FIG. 1, when the coating floor material 12 is applied to the concrete floor 11 as described above, the primer layer 13, the base coat layer 14, and the top coat layer 15 are respectively tried to draw out the performance of the coating floor material 12 sufficiently. When the construction thickness is fixed, the floor surface 16 on which the coating floor material 12 is constructed reflects a variety of small irregularities 17 and subtle inclinations 18 on the surface of the concrete floor 11 as a base. Thus, the finish is not preferable for practical use and aesthetics.

On the other hand, in the case where the flatness of the floor surface 16 on which the coating floor material 12 is applied is improved and a finish with good usability and aesthetics is required, in the process of applying the primer layer 13, the base coat layer 14, and the top coat layer 15, FIG. It is necessary to adjust the amount of the coating floor 12 (base coat layer 14) for the various small irregularities 17 and subtle inclinations 18 on the surface of the concrete floor 11 as described above, and a finish with better flatness is required. As shown in FIG. 2, it is necessary to apply the coating floor base coat layer 14 excessively. In this case, although a finish with improved flatness is obtained as compared with the case of FIG. 1, there is a problem that the amount of use of the coating floor base coat 14 is increased and the economy is lowered.

On the contrary, as shown in FIG. 3, when the usage amount of the coating base material base coat layer 14 per unit area is a recommended average construction amount, the thickness of the hardened layer of the base coat layer 14 is thick in the recess 19. The convex portion 20 is thin, and in particular, the convex portion 20 in which the amount of the base coat layer 14 to be applied is small. It is conceivable that a situation insufficient in performance may occur as compared with the case where the base coat layer 14 is applied in an appropriate amount.

  In response to the above problems, when self-leveling material is applied to the concrete floor surface to form the base of the painted floor, the effects of unevenness and inclination of the concrete floor surface on the painted floor finish surface can be avoided. When using, not only the process for the construction increases, but also a curing period is required until the cured body layer of the applied self-leveling material exhibits a predetermined strength. For this reason, it is several until the ground condition which can apply | coat a flooring material suitably, ie, the moisture content of the hardening body layer of a self-leveling material, falls to less than 5% (D value is less than 690) by the measurement with a concrete mortar moisture meter. It had to wait for a period of one week from the day, which was an issue when proceeding with an efficient schedule.

  It is an object of the present invention to provide a construction method for obtaining a coated floor finished concrete floor structure having a high horizontal level in a short construction period and having excellent adhesive strength characteristics, and a concrete floor structure obtained by the construction method. did.

As a result of repeating diligent trial and error on the above problems, the inventors have extended the construction schedule while maintaining sufficient pot life (handling time) to stably apply the self-leveling material slurry. The present inventors have found a specific self-leveling material that can form a coated floor substrate having excellent horizontal level accuracy while having fast curing and quick drying properties that can be minimized.
In addition, by applying this self-leveling material to the concrete floor and applying a specific coating floor material on the upper surface of the hardened body, it is excellent in construction efficiency and horizontal level accuracy, in addition, excellent in adhesive strength characteristics and good durability in service The present invention has been completed by finding that a coated floor finished concrete structure having properties can be obtained.

That is, the first of the present invention is a step of providing a self-leveling material slurry cured body layer on the concrete floor top surface of a building, and a step of providing a coated floor material cured body layer on the top surface of the self-leveling material slurry cured body layer. A step of providing a self-leveling material slurry cured body layer, a step of providing a primer layer for self-leveling material mortar, and an upper surface of the primer layer for self-leveling material mortar, A self-leveling material containing alumina cement and resin powder, and a step of placing and curing a slurry prepared by kneading water to form a self-leveling material slurry cured body layer. The step of providing is to cure by applying a water-based base coat for coating floors on the upper surface of the self-leveling material slurry cured body layer. A method of constructing a concrete floor structure which comprises a step of.
2nd of this invention is a concrete floor structure obtained by the said 1st construction method of this invention.

A preferable aspect of the method for constructing the concrete floor structure of the present invention will be described below. A plurality of these can be combined.
1) The step of providing a coated floor material cured body layer includes a step of providing an aqueous primer layer for a coated floor material on the upper surface of the self-leveling material slurry cured body layer, and an upper surface of the aqueous primer layer for a coated floor material, And a step of applying and curing an aqueous base coat for a coating floor material.
2) The self-leveling material should contain hydraulic components consisting of alumina cement, Portland cement and gypsum.
3) The self-leveling material includes a hydraulic component and a resin powder, and further includes at least one component selected from inorganic powder, fine aggregate, setting agent, fluidizing agent, thickener, and antifoaming agent. thing.
4) The aqueous base coat for coating floor material contains an aqueous acrylic resin emulsion.
5) The water-based primer for coating floor material contains a water-based acrylic resin system or a water-based epoxy resin system.
6) Applying a water-based base coat for a coating floor material between 1.75 hours and 48 hours after placing a slurry prepared by kneading a self-leveling material and water; A mold primer and a water-based base coat for coating floor materials should be applied.
7) The shore hardness of the surface of the cured self-leveling material slurry is 10 or more after 2 hours after the slurry is placed (constructed).
8) The Shore hardness of the surface of the self-leveling material slurry cured body is 50 or more after 6 hours from placing (constructing) the slurry.
9) A top coat layer for a coating floor material is further provided on the upper surface of the aqueous base coat cured layer of the coating floor material.

According to the method for constructing a concrete floor structure in which the self-leveling material and the coating floor material of the present invention are combined, the self-leveling material slurry is usually applied and cured on the upper surface of the concrete floor having various irregularities and slopes. Since the coating floor material is applied after forming the ground layer having an excellent horizontal level, the finished surface of the coating floor material also has an excellent horizontal level, and good serviceability and aesthetics are obtained.
Further, in the present invention, by using a self-leveling material that includes alumina cement, has excellent fast-curing property and quick-drying property, and can form a floor surface having excellent horizontal level properties, it is possible to form a coating floor substrate very efficiently and stably. It is possible to construct.
The present invention uses a self-leveling material capable of forming a floor surface having excellent quick hardening and quick drying properties and excellent horizontal level properties, and further selects an aqueous base coat or an aqueous primer and an aqueous base coat as a coating floor material. By using it, a concrete floor finished floor having excellent horizontal level and high adhesive strength can be obtained, and a concrete floor structure having excellent durability can be provided.

About the construction method and concrete floor structure of the concrete floor structure which combined the self-leveling material and coating floor material of this invention, Embodiment according to drawing shown to FIG. 4 a-FIG. 4 d-1 and FIG. 4 a-FIG. An example will be described.

FIG. 4 a is a partial cross-sectional view showing the concrete floor 31.
In the present invention, as shown in FIG. 4 b, a self-leveling material primer 34 is first applied to the top surface of a concrete floor 31 having irregularities (small irregularities) 32 and delicate slopes 33.
Next, after the self-leveling material primer 34 is dried and formed into a film, a self-leveling material slurry 35 is placed on the upper surface thereof as shown in FIG. 4c.

  Preparation and construction of the self-leveling material slurry is carried in the form of a bag into the construction site, and a predetermined amount is used in the vicinity of the construction site using a mixer such as an on-site mixing / kneading device or hand mixer. A water slurry and a self-leveling material can be mixed to prepare a slurry.

Moreover, in a large-scale site where the construction area exceeds 200 m ² , for example, a predetermined amount of water and a self-leveling material are continuously mixed as shown in, for example, JP-A-2007-326352 (FIG. 1), A lorry vehicle capable of continuously preparing a self-leveling material slurry can be used.

The self-leveling material slurry 35 supplied and applied to the concrete floor starts to harden after 1.5 hours after placing and applying the slurry.
The application of the flooring material is preferably between 1.75 hours and 48 hours, more preferably between 2 hours and 36 hours, after placing and applying the self-leveling material slurry.
Particularly preferably, between 3 hours and 24 hours, as shown in FIG. 4d-1, an aqueous base coat layer 38 for coating floor material is placed on the upper surface of the self-leveling material slurry cured body layer 36 and cured. Is preferred.
Further, in the present invention, as shown in FIG. 4d-2, a water-based primer layer 37 for coating floor material is provided on the upper surface of the self-leveling material slurry cured body layer 36, and an aqueous base coat layer 38 for coating floor material is formed on the upper surface. More preferably, it is cast and cured.

After placing and constructing the self-leveling material slurry 35, the water-based primer layer 37 for the coating floor material is provided within the elapsed time, or the water-based base coat layer 38 for the coating floor material is provided within the elapsed time. By minimizing the detachment of moisture from the surface of the self-leveling material slurry cured body, water necessary for the hydration reaction of the hydraulic component in the self-leveling material can be secured inside the self-leveling material slurry cured body, A cured slurry having good strength characteristics can be obtained.

After placing and constructing the self-leveling material slurry, before the lapse of 1.75 hours, the surface hardness of the cured self-leveling material slurry that is sufficient to perform the work for constructing the coating floor may not be expressed. This is not preferable. In addition, if it is within 48 hours, the moisture removal from the surface of the self-leveling material slurry cured body has not progressed, so that the water necessary for sufficiently hydrating the inside of the slurry cured body is sufficiently secured. Is preferred.

In the present invention, the self-leveling material primer 34 is applied to the upper surface of the concrete floor 31, and the self-leveling material slurry 35 is placed and cured, and then the surface of the self-leveling material slurry cured body layer 36 is polished. It is possible to apply a roughening treatment with a water-based base coat layer for the flooring material on the upper surface and cure the surface between the surface of the self-leveling material cured body and the water-based base coat cured body layer for the coating floor material. It is preferable because the adhesion can be further increased.
Furthermore, in the present invention, a self-leveling material primer 34 is applied to the upper surface of the concrete floor 31 and a self-leveling material slurry 35 is cast and cured, and then the surface of the self-leveling material slurry cured body layer 36 is polished. The surface of the self-leveling material cured body and the coating floor material can be treated by roughening the surface, providing an aqueous primer layer for the coating floor material on the upper surface, and placing and curing the aqueous base coat layer for the coating floor material. It is further preferable because the adhesion between the water-based primer layer for coating and the water-based base coat cured body layer for coating floor material can be further increased.
When performing the roughening treatment, for example, a commercial electric floor polisher or the like can be suitably used, and it is preferable to use # 50 to # 200 abrasive paper attached to the polisher.

In the present invention, for the purpose of protecting the surface layer of the water-based base coat cured layer 38 on the upper surface of the water-based base coat cured body layer 38 for coating floor materials, and improving the functions such as durability improvement or slip prevention, A coat 39 is preferably provided.

  Next, the primer for the self-leveling material, the self-leveling material, and the coating floor material used in the present invention will be described.

The primer for the self-leveling material used in the present invention adheres the concrete floor and the cured self-leveling material slurry firmly, and when the self-leveling material slurry is placed, moisture in the slurry is applied to the concrete floor. In order to prevent the permeating action, it is further used to prevent air in the pores of the concrete floor from passing through the self-leveling material slurry and forming bubbles on the surface of the slurry layer.

As a primer for a self-leveling material, a commercially available primer mainly composed of an acrylic-styrene copolymer resin or an ethylene vinyl acetate copolymer can be used, and in particular, a primer mainly composed of an acrylic-styrene copolymer resin is preferably used. it can.

The primer coating amount is preferably 30 to 120 g / m ^2, and preferably 45 to 90 g / m ² in order to stably obtain good adhesive strength as the resin solid content contained in the primer. Is more preferable.
The primer application operation can be performed by applying the above-described application amount in a single process, and the primer can be applied in two to three operations.

The drying time after application of the primer can be appropriately determined according to temperature conditions and ventilation conditions, and it is usually preferable to dry for 3 to 8 hours in summer and 5 to 12 hours in winter.

The self-leveling material used for the concrete floor structure construction method of the present invention contains alumina cement as an essential component.
Furthermore, the self-leveling material preferably used in the present invention contains a hydraulic component composed of alumina cement, Portland cement and gypsum.

  Several types of alumina cement having different mineral compositions are known and commercially available, but the main component is monocalcium aluminate (CA), and commercially available products can be used regardless of the type.

  Portland cement includes ordinary Portland cement, early-strength Portland cement, super-early-strength Portland cement, medium heat Portland cement, low-heat Portland cement, Portland cement such as white Portland cement, mixed cement such as blast furnace cement, fly ash cement, silica cement, etc. Can be used.

As for gypsum, each gypsum such as anhydrous gypsum, hemihydrate gypsum, and dihydrate gypsum can be used as one type or a mixture of two or more types regardless of the type.
Gypsum functions as a component that retains dimensional stability after the slurry obtained by kneading the self-flowing hydraulic composition and water is cured.

In the present invention, a hydraulic component made of alumina cement, Portland cement and gypsum is used as the hydraulic component.
The hydraulic component (the total of alumina cement, Portland cement and gypsum is 100% by mass) is preferably composed of 20 to 80% by mass of alumina cement, 5 to 70% by mass of Portland cement and 5 to 45% by mass of gypsum. More preferably, the composition consists of 25 to 70% by weight of alumina cement, 10 to 60% by weight of Portland cement and 10 to 40% by weight of gypsum, more preferably 30 to 60% by weight of alumina cement, 20 to 50% by weight of Portland cement and gypsum. A composition comprising 15 to 35% by mass, particularly preferably a composition comprising 40 to 50% by mass of alumina cement, 30 to 40% by mass of Portland cement and 20 to 30% by mass of gypsum has rapid hardening and low shrinkage. To obtain a cured product with low volume change during curing. It preferred for combed.

  The self-leveling material used in the method for constructing a concrete floor structure of the present invention has the effect of significantly reducing the air permeability of the cured body by preventing dry cracks in the cured body layer, and further, the tensile strength of the cured body It is preferable to use a resin powder because of increasing the resistance.

In the self-leveling material used in the present invention, it is preferable to premix and supply the constituent components since the blending ratio of the constituent components can be strictly controlled. Therefore, the resin powder to be used is preferably a powdered re-emulsified resin powder.
Resin powder has the effect of improving the resistance to cracking in the process where shrinkage stress generated by drying leads to cracking, and further densifying the hardened body structure and improving the adhesion to the base There is.

The resin powder is not particularly limited in its production method such as a resin pulverization method, and those produced by a known production method can be used. As the resin powder, an anti-blocking agent is mainly used. What has adhered to the surface of the resin powder can be used.
As the resin powder, it is preferable to use a re-emulsified resin powder obtained by removing the solvent by a method such as spraying or freeze-drying an aqueous polymer dispersion.

Resin powder includes vinyl acetate polymer resin, ethylene / vinyl acetate copolymer resin, vinyl acetate / versaic acid vinyl ester copolymer resin, acrylate copolymer resin, styrene / acrylic. Re-emulsified resin powders of acid ester copolymer resin, acrylic ester / vinyl acetate / versaic acid vinyl ester copolymer resin, acrylic ester / methacrylic ester copolymer resin can be used, In particular, a re-emulsified resin powder of an acrylic ester / vinyl acetate / versaic acid vinyl ester copolymer resin or a re-emulsified resin powder of an acrylic ester / methacrylic ester copolymer resin can be suitably used. .

  As the particle size of the resin powder, those having a residue on the 315 μm sieve of 3% or less, a residue on the 300 μm sieve of 3% or less, and particularly a residue of 300% on the sieve of 2% or less can be preferably used.

The resin powder is preferably 0.5 to 20 parts by mass, more preferably 1 to 15 parts by mass, further preferably 2 to 10 parts by mass, and particularly preferably 3 to 8 parts by mass with respect to 100 parts by mass of the hydraulic component. Can be used.
When the ratio of the resin powder is larger than the above range, the viscosity of the slurry obtained by adding water becomes high and the workability tends to decrease, and the compressive strength of the cured body tends to decrease. Moreover, when smaller than the said range, there exists a tendency for the improvement effect of the tensile strength of a hardening body, the reduction effect of air permeability, and the adhesiveness with a foundation | substrate to become small.

The self-leveling material used in the method for constructing a concrete floor structure according to the present invention includes a hydraulic component and resin powder made of alumina cement, Portland cement and gypsum, and further includes inorganic powder, fine aggregate, setting modifier, fluidizing agent. It is preferable to contain a thickener and an antifoaming agent.

  The self-leveling material used in the present invention preferably contains at least one inorganic component selected from blast furnace slag fine powder, fly ash, silica fume, calcium carbonate fine powder and dolomite fine powder, and particularly blast furnace slag fine powder. By including, the crack resistance of the hardening body by drying shrinkage | contraction can be improved.

  In the self-leveling material, the added amount of the inorganic component is preferably 10 to 200 parts by mass, more preferably 20 to 150 parts by mass, still more preferably 30 to 130 parts by mass, particularly preferably 100 parts by mass of the hydraulic component. It is preferable to set it as 40-100 mass parts.

In the self-leveling material, the addition amount of the blast furnace slag fine powder is preferably 10 to 200 parts by weight, more preferably 20 to 150 parts by weight, even more preferably 30 to 130 parts by weight, particularly 100 parts by weight of the hydraulic component. Preferably it is 40-100 mass parts.
If the amount of blast furnace slag fine powder added is equal to or greater than the lower limit of these ranges, the drying shrinkage of the cured product is not large and is an appropriate value, and if it is less than the upper limit of these ranges, the initial strength is reduced. There is no.
As the blast furnace slag fine powder, those having a brain specific surface area of 3000 cm ² / g or more as defined in JIS A 6206 can be used.

The self-leveling material can further contain fine aggregate as necessary.
The fine aggregate is preferably in the range of 30 to 500 parts by mass, more preferably 40 to 400 parts by mass, still more preferably 60 to 300 parts by mass, and particularly preferably 80 to 150 parts by mass with respect to 100 parts by mass of the hydraulic component. Is preferred.

  As the fine aggregate, an aggregate having a particle size of 2 mm or less, preferably an aggregate having a particle size of 0.075 to 1.5 mm, more preferably an aggregate having a particle size of 0.1 to 1 mm, particularly preferably 0.15 to 0.15. It is preferable that the main component is an aggregate of 0.6 mm.

Fine aggregates include silica sand, river sand, sea sand, mountain sand, crushed sand, etc., alumina cement clinker, silica powder, clay mineral, waste FCC catalyst, inorganic materials such as limestone, crushed urethane, EVA foam, foam A resin pulverized product such as a resin can be used.
In particular, as fine aggregates, sand such as quartz sand, river sand, sea sand, mountain sand, crushed sand, waste FCC catalyst, quartz powder, alumina cement clinker and the like can be preferably used.
The particle size of the fine aggregate is measured using several sieves having different nominal dimensions as defined in JIS Z 8801.

The self-leveling material uses a fluidizing agent (water reducing agent such as a high-performance water reducing agent) that ensures suitable fluidity while suppressing material separation.
Since the expression strength of alumina cement, which is a hydraulic component, is greatly affected by the water / cement ratio, it is particularly preferable to reduce the water / hydraulic component ratio by using a fluidizing agent having a water reducing effect.

  As a fluidizing agent, commercially available fluidizing agents such as lignin-based, melamine sulfonic acid formaldehyde condensate, casein, calcium caseinate, polyether-based, polyetherpolycarboxylic acid, etc., which have a water-reducing effect, are available. Any commercially available fluidizer such as polyether-based polycarboxylic acid, such as polyether-based, can be used.

  The fluidizing agent can be appropriately added in a range that does not impair the characteristics, depending on the hydraulic component used, and is preferably 0.01 to 2.0 parts by mass, more preferably 100 parts by mass of the hydraulic component. Can be blended in an amount of 0.02 to 1.0 parts by mass, particularly preferably 0.05 to 0.5 parts by mass. If the amount added is too small, no suitable effects (excellent fluidity and high cured product strength) will be exhibited, and if the amount added is too large, an effect commensurate with the amount added cannot be expected and it is merely uneconomical. In some cases, the viscosity is increased, and the amount of kneading water for obtaining the required fluidity increases to deteriorate the strength properties.

  Depending on the hydraulic component used and the constituents of the self-leveling material, the setting modifier can be added as appropriate within the range that does not impair the properties, and the components, addition amount and mixing ratio of the setting retarder and setting accelerator can be adjusted. It can be selected as appropriate to adjust the pot life, fast-curing property and quick-drying property of the self-leveling material, and it is very easy to use as a self-leveling material.

  As the setting retarder, a known setting retarder can be used. Examples of setting retarders include organic acids such as sodium sulfate, sodium bicarbonate, sodium tartrate (L-sodium tartrate, DL-sodium tartrate, sodium hydrogen tartrate, etc.), sodium malate, sodium citrates, sodium gluconate For example, sodium salts such as inorganic sodium salts and organic sodium salts, oxycarboxylic acids, and the like can be used alone or in combination of two or more.

Oxycarboxylic acids include oxycarboxylic acids and their salts.
Examples of the oxycarboxylic acid include aliphatic oxyacids such as citric acid, gluconic acid, tartaric acid, glycolic acid, lactic acid, hydroacrylic acid, α-oxybutyric acid, glyceric acid, tartronic acid, malic acid, salicylic acid, and m-oxybenzoic acid. Examples thereof include aromatic oxyacids such as acid, p-oxybenzoic acid, gallic acid, mandelic acid and tropic acid.
Examples of oxycarboxylic acid salts include alkali metal salts of oxycarboxylic acids (specifically, sodium salts, potassium salts, etc.), alkaline earth metal salts (specifically, calcium salts, barium salts, magnesium salts, etc.), etc. Can be mentioned.
In particular, sodium bicarbonate and sodium L-tartrate are preferred from the standpoints of setting delay effect, availability, and cost, and more preferably used in combination.

When one or more kinds of setting retarders are used, the amount of each setting retarder is preferably 0.01 to 3.0 parts by mass, more preferably 100 parts by mass of the hydraulic component. 0.1 to 2.5 parts by mass, more preferably 0.2 to 2.0 parts by mass, and particularly preferably 0.25 to 1.5 parts by mass. It is preferable because the working time can be secured.

As a setting accelerator, the well-known component which accelerates | stimulates can be used, for example, lithium salt which has a setting acceleration effect can be used suitably.
Examples of lithium salts include inorganic lithium salts such as lithium carbonate, lithium chloride, lithium sulfate, lithium nitrate, lithium hydroxide, and organic acid organics such as lithium acetate, lithium oxalate, lithium tartrate, lithium malate, and lithium citrate. Lithium salts such as lithium salts can be used. In particular, lithium carbonate is preferable from the viewpoints of the setting acceleration effect, availability, and cost.

As the setting accelerator, it is preferable to use a particle size that does not interfere with the properties, and the particle size is preferably 50 μm or less.
Particularly when a lithium salt is used, the particle diameter of the lithium salt is preferably 50 μm or less, more preferably 30 μm or less, and particularly preferably 10 μm or less. If the particle diameter is larger than the above range, the solubility of the lithium salt decreases, which is not preferable. Then, it may be conspicuous as a large number of fine spots, and the appearance may be impaired.

  The setting accelerator is preferably 0.01 to 1 part by weight, more preferably 0.01 to 0.5 part by weight, and still more preferably 0.02 to 0.3 part, with respect to 100 parts by weight of the hydraulic component. It is preferable to use in the range of part by mass, particularly preferably in the range of 0.02 to 0.2 part by mass, since suitable quick hardening and quick drying can be obtained after securing the pot life of the self-leveling material.

Thickeners include hydroxyethyl methylcellulose, and other cellulose-based excluding hydroxyethylmethylcellulose, modified starches such as starch ether and guar gum, protein-based, latex-based, and water-soluble polymer-based thickeners are used in combination. Can be used.
The addition amount of the thickener can be added within a range not impairing the characteristics of the present invention, and is preferably 0.001 to 2 parts by mass, more preferably 0.005 to 100 parts by mass of the hydraulic component. It is preferable to include 1.5 parts by mass, more preferably 0.01 to 1 part by mass, particularly 0.05 to 0.8 parts by mass. When the addition amount of the thickener increases, the viscosity of the slurry may increase to cause a decrease in fluidity. Therefore, it is preferably used within the above preferable range.

  Using a thickener and an antifoaming agent together has a favorable effect on suppressing the separation of aggregates such as hydraulic components and fine aggregates, suppressing the generation of bubbles, and improving the surface of the cured body. It is preferable for improving the properties of the cured product.

  As the antifoaming agent, known substances such as silicone-based, alcohol-based, polyether-based synthetic substances or mineral oil-based, plant-derived natural substances can be used alone or in combination of two or more.

  The addition amount of the antifoaming agent can be added within a range that does not impair the characteristics of the present invention. When one type of antifoaming agent is used, it is preferably 0.001 to 4 parts relative to 100 parts by mass of the hydraulic component. 0.0 part by mass, more preferably 0.005 to 3.0 parts by mass, more preferably 0.01 to 2.5 parts by mass, and particularly preferably 0.02 to 2.0 parts by mass. The addition amount of the antifoaming agent is preferably within the above range because a suitable antifoaming effect is recognized.

In addition, when two or more kinds of antifoaming agents are used in combination, the addition amount of the antifoaming agent is preferably 0.001 to 2 parts by mass with respect to 100 parts by mass of the hydraulic component. More preferably, it is 0.005 to 1.5 parts by mass, more preferably 0.01 to 1.3 parts by mass, and particularly preferably 0.02 to 1.2 parts by mass. The addition amount of the antifoaming agent is preferably within the above range because a suitable antifoaming effect is recognized.

  In the case of constituting a self-leveling material, particularly suitable component constitution is a hydraulic component made of alumina cement, Portland cement and gypsum, resin powder, inorganic component, fine aggregate such as silica sand, fluidizing agent, thickener, It contains an antifoaming agent and a setting modifier.

  The hydraulic component and resin powder, inorganic component, fine aggregate, fluidizer, thickener, antifoaming agent and setting modifier can be mixed in a mixer to obtain a premix powder of a self-leveling material. .

  The pre-mix powder of the self-leveling material can be mixed and stirred with a predetermined amount of water to produce a slurry (mortar) having a self-leveling property in the form of a slurry. A cured product can be obtained.

  In a site where the construction area is large, it is preferable to use a self-leveling material slurry preparation / construction truck having a tank for storing a self-leveling material as shown in, for example, JP-A-2007-326352 (FIG. 1). Since a slurry of a leveling material can be continuously prepared and continuously supplied to a construction site for construction, a more excellent self-leveling material cured body can be obtained from the viewpoint of construction efficiency and construction quality.

The construction area where the self-leveling material slurry preparation and construction truck can be suitably applied is preferably a site having a construction area of 200 m ² or more, more preferably a site having a construction area of 400 m ² or more, particularly preferably 500 m ² or more. This site has a construction area of
When applying a self-leveling material slurry to such a large-area site, the use of the truck makes the construction efficiency very high and significantly shortens the transition period to the next step, coating floor material construction. I can do it.

Self-leveling material can be mixed and stirred with water to produce a slurry (mortar). By adjusting the amount of water added, the fluidity of the slurry (mortar), pot life, material separability, slurry The strength of the (mortar) cured product can be adjusted.
The self-leveling material slurry used in the present invention has a mass ratio (W / C) of the self-leveling material (C) and water (W) of preferably 0.16 to 0.28, more preferably 0.18. It is preferable to mix and knead so as to be in the range of ˜0.26, more preferably in the range of 0.19 to 0.25, and particularly preferably in the range of 0.20 to 0.24.

  The self-leveling material used in the present invention has a flow value of a slurry (mortar) having a self-leveling property (self-fluidity) prepared by mixing with water, preferably 190 to 270 mm, more preferably 200 to 260 mm, particularly It is preferable that the thickness is preferably adjusted to 210 to 255 mm for the reason that it is easy to obtain a hardened product surface with high ease of construction and high smoothness.

The construction thickness of the self-leveling material slurry depends on the unevenness of the concrete floor slab surface and the slope of the slab surface, and the thickness can be set appropriately for each construction site. The construction thickness is preferably in the range of 2 mm to 70 mm, more preferably in the range of 2.5 mm to 50 mm, more preferably in the range of 3 mm to 40 mm, and particularly preferably 3. Pouring is preferably performed in the range of 5 mm to 30 mm.

When thinning a self-leveling material slurry to a height of 2 mm to 5 mm with reference to the top surface of the most convex part of the floor slab surface, the slurry is evenly distributed using a spike roller, a dragonfly, a trowel, etc. while pouring the slurry. It is preferable to form the slurry at a high horizontal level with a thin layer over the entire floor slab.

When the self-leveling material slurry is applied thickly to a height of 5 mm to 70 mm on the basis of the top surface of the most convex part of the floor slab surface, the slurry is spread evenly using a dragonfly while pouring the slurry. It is preferable to perform an auxiliary operation to form the slurry at a high level in a thick layer over the entire floor slab.

The self-leveling material slurry used in the present invention has sufficient pot life (handling time) to ensure good workability while having fast curing and quick drying properties.
The pot life of the self-leveling material slurry is preferably 40 minutes from the slurry preparation, more preferably 50 minutes, and particularly preferably 60 minutes.

Self-leveling material slurry, depending on the temperature and humidity conditions at the construction site, starts curing when it exceeds 1.5 hours after the completion of construction, and the surface hardness of the cured body increases and cures as curing progresses. The moisture content on the body surface decreases.

  The shore hardness of the surface of the cured self-leveling material slurry is preferably 10 or more after 2 hours, more preferably 15 or more after 2 hours, more preferably 20 or more after 2 hours, particularly preferably 2 from the placement (construction) of the slurry. It develops a Shore hardness of 25 or more after hours.

Further, the Shore hardness of the surface of the cured self-leveling material slurry is preferably 50 or more after 6 hours, more preferably 50 or more after 4 hours, more preferably 50 or more after 3.5 hours from the placement (construction) of the slurry, Particularly preferably, a Shore hardness of 50 or more is developed after 3 hours.

The water content of the surface of the cured self-leveling material slurry is less than 5% (D value is less than 690), and the time (elapsed time from the placement of the slurry) is preferably 12 to 24 hours. Yes, more preferably 12 hours to 22 hours, more preferably 12 hours to 20 hours, and particularly preferably 12 hours to 18 hours.
By using the self-leveling material excellent in quick hardening and quick drying used in the present invention, a good cured state and a surface dry state can be obtained quickly.

The expansion of the length change rate of the cured self-leveling material slurry is preferably in the range of 0 to 0.08%, more preferably 0 to 0.06%, and particularly preferably 0 to 0.05%. The rate of change shrinkage is preferably in the range of -0.08 to 0%, more preferably -0.06 to 0%, particularly preferably -0.05 to 0%, and has the aforementioned expansion or contraction characteristics. The self-leveling material is preferable because it can prevent cracks in the cured body itself and can maintain a high adhesive force between the concrete floor serving as the foundation and the coating floor material applied to the upper layer.

In addition, if the range of the rate of change in length is out of the above range, cracks may occur due to the curing shrinkage of the cured body of the self-leveling slurry, and moisture from the underlying concrete floor diffuses through the cracks. In this case, the upper coated floor material cured layer may swell, which is not preferable.

The coating floor material used in the present invention is configured by providing a single or a plurality of aqueous base coat layers for coating floor materials.
Moreover, the coating floor material used by this invention can be comprised from an aqueous type primer layer and an aqueous type basecoat layer.
Further, the coating floor material used in the present invention can be composed of an aqueous primer layer, an aqueous base coat layer, and a top coat layer.

The kind of the flooring material used in the present invention can be appropriately selected from water-based organic flooring materials or water-based inorganic flooring materials depending on the required properties.
In the present invention, it is preferable to select and use an aqueous type flooring material because a highly stable adhesive force can be obtained between the self-leveling material slurry cured body and the coated flooring material cured body layer. This is presumably because the water-based coating floor material does not contain an organic solvent, so that the resin component contained in the cured self-leveling material slurry, which is the base layer of the coating floor material, is not dissolved or altered.

The water-based primer layer for use in the present invention is used for improving the adhesion of the coating floor material to the foundation, preventing the suction to the foundation, and preventing pinholes in the coating floor material.
The water-based primer for organic coating floor materials used in the present invention is water-based epoxy resin, water-based epoxy resin and cement, water-based urethane resin, water-based urethane resin and cement, water-based methacrylic. A resin system, an aqueous acrylic resin system, or the like can be used. Further, depending on the application, an aqueous pigment for a flooring material containing an organic pigment, an inorganic pigment, or a filler such as talc, calcium carbonate, and powdered silica can be used, particularly an aqueous acrylic resin primer or aqueous type. An epoxy resin-based primer can be suitably used.
As the water-based primer for inorganic coating floor materials used in the present invention, a water-based ethylene vinyl acetate resin system, a water-based acrylic resin system, or the like can be used.
The construction of the water-based primer for a coating floor material used in the present invention can be used by appropriately selecting a brush or a roller in accordance with the construction manual of each coating floor material manufacturer.

The aqueous base coat layer for coating floor material used in the present invention is used for imparting main functions such as durability, mechanical strength, antistatic, anticorrosion, and elasticity of the coating floor material.
Water-based base coats for organic coating floor materials used in the present invention are water-based epoxy resin-based, water-based urethane resin-based, water-based methacrylic resin-based, water-based acrylic resin-based, water-based polyester resin-based, water-based vinyl ester resin A water-based acrylic resin base coat can be particularly preferably used. Also, depending on the use, it is possible to use organic pigments, inorganic pigments or fillers such as talc, calcium carbonate, and powdered silica, as well as water-based acrylic resin-based aqueous base coats containing fine aggregates. it can. Furthermore, the water-based base coat layer for coating floor material used in the present invention can be used by applying one layer or two or more layers.

The water-based base coat for inorganic coating floor materials used in the present invention is composed of Portland cement, white Portland cement, super-hard cement, special fast-curing cement and one or more cement cements composed of alumina cement, and ethylene. An aqueous base coat for a coating floor composed of one or a combination of two or more synthetic resin emulsions such as vinyl acetate, styrene butadiene rubber, chloroprene rubber, acrylic, and epoxy can be used. Further, an aqueous base coat for an inorganic coating floor material containing a filler such as an organic pigment, an inorganic pigment or talc, calcium carbonate, and powdered silica can be used depending on the application. Furthermore, the water-based base coat layer for coating floor material used in the present invention can be used by applying one layer or two or more layers.
The construction of the water-based base coat for a flooring material used in the present invention can be used by appropriately selecting a trowel, a roller or a brush according to the construction manual of each flooring material manufacturer.

The water-based topcoat layer used in the present invention is used for the purpose of providing protection and various functions of the base coat layer such as fading resistance, weather resistance, stain resistance, anti-slip property or matte finish.
Examples of the water-based topcoat for organic or inorganic coating floor materials used in the present invention include water-based epoxy resin-based, water-based urethane resin-based, water-based methacrylic resin-based, water-based acrylic resin-based, water-based polyester resin-based Water-based vinyl ester resin, etc., solvent-type epoxy resin, solvent-type urethane resin, solvent-type acrylic resin, solvent-free epoxy resin, solvent-free urethane resin, moisture-curing urethane resin, methacrylic resin 1 type or 2 or more types of topcoats selected from a polyester system, a polyester resin system, a vinyl ester resin system, etc., can be selected and used by applying one layer or two or more layers. A coat or a water-based epoxy resin topcoat can be suitably used.
The construction of the water-based topcoat for a flooring material used in the present invention can be used by appropriately selecting a trowel, a roller, a brush or the like in accordance with the construction guidelines of each flooring material manufacturer.

Hereinafter, the present invention will be described in detail based on examples. However, the present invention is not limited by the following examples.

(Characteristic evaluation method)
(1) Fluidity evaluation of self-leveling material slurry:
・ Measurement method of flow value:
Measured according to JASS 15M-103. A plastic pipe (internal volume 100 ml) with an inner diameter of 50 mm and a height of 51 mm is placed on a 5 mm thick glass sheet, and after mixing the kneaded self-leveling material slurry up to the upper end of the resin pipe, the pipe is vertically oriented. Pull up. After the spread of the slurry stops, the diameters in two directions at right angles are measured, and the average value is taken as the flow value to evaluate the fluidity of the slurry.
-SL value measurement method:
The SL value is measured by using the SL measuring device shown in FIG. 5, a rail having a width of 30 mm × a height of 30 mm × a length of 750 mm is provided with a weir plate at a length of 150 mm from the tip, and a predetermined amount of slurry immediately after kneading is filled. To mold. Immediately after molding, the weir plate is pulled up, and after stopping the slurry flow, the distance from the gauge point (weir plate installation part) to the shortest part of the slurry flow is measured, and the value (SL value) is set to L0. Then, the time for 200 mm is measured, and the measurement time is defined as the SL flow rate (L0) (second / 200 mm).
Similarly, after 20 or 30 minutes after molding, the weir plate is pulled up, and after the flow of the slurry is stopped, the distance from the gauge point (the installation portion of the weir plate) to the shortest portion of the slurry flow is measured, and the value (SL value) ) Is set to L20 or L30, the time for flowing 200 mm from the weir plate is measured, and the measurement time is set to SL flow velocity (L20, L30) (second / 200 mm), respectively.
・ Evaluation conditions are 20 ° C and 65% humidity.

(2) Evaluation of length change of self-leveling material slurry cured body:
-The length change rate is measured using the apparatus shown in FIG. In measuring the rate of change in length, the slurry immediately after kneading is cast to the height of the mold inside the mold, and the measurement of the length change is started immediately after the casting. The measurement interval of the rate of change in length is every 5 minutes, and the measurement is made until the age of 28 days. The measurement conditions are 20 ° C. and RH 65%.
The rate of change in length when the self-leveling material slurry is cured is the amount of change (mm) in the distance between the SUS disk 45b and the end of the displacement sensor 44 on the SUS disk 45b side shown in FIG. Is the value divided by the distance b between the SUS disk 45a and the SUS disk 45c at the time of filling.

FIG. 7, FIG. 8 and FIG. 9 are diagrams schematically showing an example of a change in the length of the sample in the process of curing the self-leveling material slurry.
In FIG. 7, the measurement sample has an age of 0 days (point a) as a base length and expands with hardening, expands most at point b, and then gradually contracts to a length of 28 days (point c). In Equations (1) to (3), B is the length of the sample at point a, C is the length of the sample at point b, and A is the length of the sample at point c.
In FIG. 8, the material sample has an age of 0 days (a point) as a base length, and gradually contracts without expanding with hardening, and becomes a length of 28 days (c point). In Equations (1) to (3), B and C are the length of the sample at point a, and A is the length of the sample at point c.
In FIG. 9, the measurement sample has an age of 0 days (point a) as a base length, and gradually expands without shrinking with hardening, and becomes a length of material age 28 days (point c). In equations (1) to (3), B is the length of the sample at point a, and A and C are the lengths of the sample at point c.

Measurement method of length change rate: Measured using the apparatus shown in FIG. 6, and the length change rate is calculated according to the following formula (1).
The measurement sample is filled with a self-leveling material slurry, and immediately after placement, the age is 0 days. The measurement conditions are 20 ° C. and RH 65%.
The length change rate (−) means contraction, and (+) means expansion.

・長さ変化率の収縮の測定法：図６に示す装置を用いて、長さ変化率の測定法で作製した測定試料を用いて測定する。長さ変化率の膨張は、試料の最も膨張したときの試料の長さ（Ｃ）であり、数式（２）に従い、算出する。

Measurement method of contraction of length change rate: Using the apparatus shown in FIG. 6, measurement is performed using a measurement sample prepared by the measurement method of length change rate. The expansion of the rate of change in length is the length (C) of the sample when the sample is most expanded, and is calculated according to Equation (2).

・長さ変化率の収縮の測定法：図６に示す装置を用いて、長さ変化率の測定法で作製した測定試料を用いて測定する。長さ変化率の収縮は、試料の最も膨張したときの長さを基長として、数式（３）に従い、算出する。

Measurement method of contraction of length change rate: Using the apparatus shown in FIG. 6, measurement is performed using a measurement sample prepared by the measurement method of length change rate. The contraction of the rate of change in length is calculated according to Equation (3), with the length when the sample is most expanded as the base length.

(3) Evaluation of surface properties of cured body of self-leveling material slurry:
-Shore hardness measurement method: At a predetermined elapsed time after pouring the self-leveling material slurry, the hardened surface is pressed vertically to any 3 to 5 locations using a spring type hardness meter type D (manufactured by Ueshima Seisakusho). The average value of the readings of the spring type hardness tester type D gauge at that time is regarded as the Shore hardness of the time, and the surface hardness is evaluated.
・ Scratch strength measurement method: After a self-leveling material slurry is poured, the cured surface is subjected to arbitrary 3 to 5 using a scratch tester (Japanese Architectural Institute of Japan, Japan Painted Floor Industry Association certified product). Scratch a length of about 10 cm along the ruler at a speed of 2 cm / second. The scratch width at a load of 1.0 kg is measured using a crack scale and a magnifying glass, and the scratch strength as the time is evaluated as the surface hardness.
-Moisture content on the surface of the cured body The moisture content (D value) on the cured surface is measured using a concrete mortar moisture meter (manufactured by Kett Kagaku Kenkyusha Co., Ltd.) after a predetermined amount of time has elapsed since pouring of the leveling material slurry . Moisture content of less than 5% when measured value D value (HI-500) is less than 690 based on "Measurement method and grade of various qualities of concrete floor surface layer part" of Japan Floor Construction Technology Research Council It is determined that
-Hardened surface properties:
The surface of the hardened slurry was cured by pouring the self-leveling material slurry into a 13 cm x 19 cm resin mold at a thickness of 10 mm, and visually checking for pulverization and fine irregularities at 24 hours of age. It was evaluated by observing. Evaluation is as follows.
Evaluation conditions are performed in an environment of a temperature of 20 ° C. and a humidity of 65%.
○: None, ×: Present

(4) Evaluation of compressive strength (N / mm ² ) and bending strength (N / mm ² ) of the cured self-leveling material slurry:
・ The produced slurry is packed in a 4 × 4 × 16 cm form shown in JIS R-5201, cured in air at a temperature of 20 ° C. and a humidity of 65% for 24 hours, demolded, and further in the air. Additional molding is performed for a predetermined period (7 days, 28 days) to obtain a molded body. The molded body is measured according to the method described in JIS / R-5201.

(5) Evaluation of adhesive strength:
・ Measurement method of adhesive strength:
Measured in accordance with NNK-005: 2000 (Japan Paint Floor Industry Association) coating strength test method. A coated floor material is applied on the self-leveling material slurry cured body layer one day after the self-leveling material slurry is poured to provide a coated floor material cured body layer. A square steel jig having an attachment surface of 40 mm × 40 mm is bonded to five places with an adhesive on the coated floor material cured body layer after 10 days of age. After the adhesive has hardened, make a cut with a diamond cutter along the circumference of the steel jig until it reaches the hardened layer of the self-leveling material slurry, attach the steel jig to the Kenken-type adhesion tester, and gradually pull it. Apply a load and pressurize until it breaks. The maximum load until breaking is the maximum tensile load, and the average strength of the five locations is the bond strength with the coating floor.
The bond strength with the coating floor material is calculated according to Equation (4).

(Materials used): The following materials were used.
1) Primer for self-leveling material: U primer G manufactured by Ube Industries, Ltd.
2) Self-leveling material: A self-leveling material in which the following raw materials were mixed at the blending ratio shown in Table 1 was used.
Alumina cement: Fondge, manufactured by Kerneos, Blaine specific surface area of 3100 cm ² / g.
Portland cement: Hayashi Cement, Ube Mitsubishi Cement Co., Blaine specific surface area 4500 cm ² / g.
Gypsum: Type ^II anhydrous gypsum, manufactured by Central Glass Co., Ltd., Blaine specific surface area of 3460 cm ² / g.
-Fine aggregate: Silica sand: No. 6 silica sand.
-Inorganic component: Blast furnace slag fine powder, rebirth, manufactured by Chiba Rebirth, Blaine specific surface area 4400 cm ² / g.
Resin powder: Acrylic ester / vinyl acetate / versaic acid vinyl ester copolymer, DM2071P, manufactured by Nichigo Movinyl Co., Ltd.
-Setting adjuster a: Sodium bicarbonate, manufactured by Tosoh Corporation.
-Setting adjuster b: L-sodium tartrate, manufactured by Fuso Chemical Industries.
-Setting adjuster c: Lithium carbonate, manufactured by Honjo Chemical Co., Ltd.
-Fluidizer: Polycarboxylic acid fluidizer, manufactured by Kao Corporation.
-Thickener: Hydroxyethyl methylcellulose type thickener, Marporose MX-30000, manufactured by Matsumoto Yushi Seiyaku Co., Ltd.
Antifoaming agent a: a polyether antifoaming agent, manufactured by San Nopco.
-Antifoaming agent b: Polyether type antifoaming agent, made by ADEKA.
3) Primer / primer a for coating floor material: Solvent type epoxy, Infix EF, manufactured by Fujimaru Chemical Co., Ltd.
Primer b: Solvent type epoxy system, JE-70, manufactured by AICA.
4) Base coat / base coat a for coating floor material: Solvent type epoxy, Oncrete 73R, manufactured by Fujimaru Chemical Co., Ltd.
Base coat b: Solvent type epoxy, JE-10, manufactured by AICA.
Base coat c: Solvent type urethane, JU-20, manufactured by AICA.
Base coat d: Water-based acrylic, Archiflo AW, manufactured by SK Kaken.
5) Topcoat / topcoat a for coating floor material: Solvent type epoxy type, Oncrete # 58, manufactured by Fujimaru Chemical Co., Ltd.

(Preparation of slurry for self-leveling material)
The self-leveling material and water prepared at the blending ratio shown in Table 1 under the conditions of room temperature of 20 ° C. and relative humidity of 65%, and in Example 1, the ratio of 22 parts by mass of water to 100 parts by mass of the self-leveling material. In Example 1, Reference Example 1 is blended at a ratio of 26 parts by mass of water with respect to 100 parts by mass of the self-leveling material, and kneaded for 3 minutes using a chemistor with a rotation speed of 650 rpm to prepare a self-leveling material slurry. did.

The water-based acrylic coating floor made by SK Kaken Co., Ltd. was prepared by the method shown below.
(Preparation of water-based base coat for coating floor)
Under the conditions of room temperature of 20 ° C. and relative humidity of 65%, blended at a ratio of 10 parts by mass of fresh water to 100 parts by mass of the base of the water-based acrylic base coat for paint flooring, using a chemistor with a rotation speed of 650 rpm. The mixture was kneaded for 3 minutes to prepare an aqueous epoxy base coat for coating floor material manufactured by SK Kaken.

Preparation of a solvent-type epoxy coating floor material manufactured by Fujimaru Chemical Co., Ltd. was performed by the following method.
(Preparation of solvent-type primer for coating floor material)
Under conditions of room temperature of 20 ° C. and relative humidity of 65%, blended at a ratio of 50 parts by mass of B agent to 100 parts by mass of solvent A type epoxy primer for coating floor material, and using a chemistor with a rotation speed of 650 rpm The mixture was kneaded for 3 minutes to prepare a solvent-type epoxy primer for coating floor material manufactured by Fujimaru Chemical Co., Ltd.
(Preparation of solvent-based base coat for coating floor materials)
Under conditions of room temperature of 20 ° C. and relative humidity of 65%, blending is carried out at a ratio of 25 parts by mass of curing agent B and 125 parts by mass of No. 7 silica sand with respect to 100 parts by mass of solvent-based epoxy base coat for coating floor material. A solvent type epoxy base coat for coating floor material manufactured by Fujimaru Chemical Co., Ltd. was prepared by kneading for 3 minutes using a chem stirrer of several 650 rpm.
(Preparation of solvent-type top coat for coating floor material)
Under conditions of a room temperature of 20 ° C. and a relative humidity of 65%, a mixing ratio of 12.5 parts by mass of the curing agent B with respect to 100 parts by mass of the solvent-based epoxy topcoat for coating floor material is used, and the rotation speed is 650 rpm. The mixture was kneaded for 3 minutes using a stirrer to prepare a solvent-type epoxy topcoat for a coating floor material manufactured by Fujimaru Chemical Co., Ltd.

The preparation of the solvent-type epoxy coating material made by AICA was carried out by the following method.
(Preparation of solvent-type primer for coating floor material)
Under conditions of room temperature of 20 ° C. and relative humidity of 65%, blended at a ratio of 100 parts by mass of B agent to 100 parts by mass of solvent A type epoxy primer for coating floor material, and using a chemistor with a rotation speed of 650 rpm The mixture was kneaded for 3 minutes to prepare a solvent-type epoxy primer for coating floor material manufactured by AICA.
(Preparation of solvent-based base coat for coating floor materials)
Under conditions of room temperature of 20 ° C. and relative humidity of 65%, blended at a ratio of 50 parts by mass of curing agent B to 100 parts by mass of solvent-based epoxy base coat for coating floor material, using a chemistor with a rotation speed of 650 rpm. The mixture was kneaded for 3 minutes to prepare a solvent-type epoxy base coat for a coating floor material manufactured by AICA.

The preparation of the solvent type urethane-based coating floor material manufactured by AICA was carried out by the method shown below.
(Preparation of solvent-type primer for coating floor material)
Under conditions of room temperature of 20 ° C. and relative humidity of 65%, blended at a ratio of 100 parts by mass of B agent to 100 parts by mass of solvent A type epoxy primer for coating floor material, and using a chemistor with a rotation speed of 650 rpm The mixture was kneaded for 3 minutes to prepare a solvent-type epoxy primer for coating floor material manufactured by AICA.
(Preparation of solvent-based base coat for coating floor materials)
Under conditions of room temperature of 20 ° C. and relative humidity of 65%, blended at a ratio of 100 parts by mass of the curing agent B to 100 parts by mass of the solvent-based urethane base coat for coating floor materials, using a chemistor with a rotation speed of 650 rpm. The mixture was kneaded for 3 minutes to prepare a solvent-based urethane base coat for a coating floor material manufactured by AICA.

[Example 1, Reference Example 1]
A self-leveling material slurry was prepared using a self-leveling material containing the components shown in Table 1. Table 2 shows the measurement results of the fluidity (flow value, SL value) of the slurry.

Under conditions of room temperature 20 ° C and relative humidity 65%, JIS A5304 pavement concrete flat plate 300mm x 300mm x 60mm concrete flat plate 3 times the primer for self-leveling material (stock solution 150g / m2 water 300g / M2 addition) was applied and dried. After the primer film formation, the self-leveling material slurry was poured and cured to a working thickness of 10 mm to obtain a self-leveling material slurry cured body layer. Table 3 shows the results of evaluating the surface hardness (Shore hardness), scratch strength, surface moisture content and surface properties of the cured slurry.

In addition, the self-leveling material slurry of the above two types is packed into a 4 × 4 × 16 cm mold shown in JIS R-5201 to measure the rate of change in length, compressive strength and bending strength. A specimen was obtained. Table 3 shows the results of evaluating the rate of change in length, compressive strength, and bending strength of the cured slurry.

[Example 2, Reference Examples 2 to 4]
After applying a primer for self-leveling material to JIS A5304 pavement concrete flat plate and drying it, the primer layer is formed into a film, and then the self-leveling material slurry is poured and cured to a construction thickness of 10 mm. (1 day) It cured and obtained the self-leveling material slurry hardening body layer. Next, a coating floor material was applied on the cured self-leveling material slurry layer, and after the coating floor material was cured, curing was performed for the period shown in Table 4 to obtain a specimen of a coated floor finished concrete structure.

Construction of a water-based acrylic coating floor material manufactured by SK Kaken Co., Ltd. was carried out by the following method.
A first layer of the base coat was provided by applying a water-based acrylic base coat for a coating floor material using a roller so as to be 200 g / m ² . After the first layer of the water-based acrylic base coat for the coating floor is cured, the base layer is applied by applying a roller so that the second layer of the water-based acrylic base coat for the coating floor is 200 g / m ^2. Provided.

The construction of the solvent-type epoxy coating floor material manufactured by Fujimaru Chemical Co., Ltd. was performed by the following method.
Apply and dry the solvent-type epoxy primer for coating floor using a roller to 150 g / m ² to form a primer layer, and then apply the solvent-based epoxy base coat for coating floor to 1 kg / m ^2. A base coat layer was provided by applying with a trowel. After the solvent-based base coat for the coating floor was cured, the solvent-coated epoxy top coat for the coating floor was applied using a trowel so as to be 1.5 kg / m ² to provide a top coat layer.

The construction of the solvent-type epoxy coating floor material manufactured by AICA was performed by the following method.
After applying and drying a solvent-type epoxy primer for coating floor using a roller to form 200 g / m ² and forming a primer layer, the first layer of solvent-based epoxy base coat for coating floor is 200 g / m. ^The base coat first layer was provided by applying with a roller so as to be ² . After the first layer of the solvent-based epoxy base coat for the coating floor material is cured, the second layer of the solvent-based epoxy base coat for the coating floor material is applied with a roller so that the second layer becomes 200 g / m ^2. Provided.

Construction of the solvent-type urethane-based coating floor material manufactured by AICA was carried out by the method shown below.
After applying and drying a solvent-type epoxy primer for coating floor using a roller to form 200 g / m ² and forming a primer layer, the first layer of the solvent-based urethane base coat for coating floor is 500 g / m. ^The base coat first layer was provided by applying with a trowel so as to be ² . After the first layer of the solvent-based epoxy base coat for the coating floor is cured, the second layer of the solvent-based epoxy base coat for the coating floor is applied with a trowel so that the second layer is 1.0 kg / m ^2. A layer was provided.

Table 4 shows the results of the adhesion test on the combination of the self-leveling material and the coating floor material used, and these specimens.

(1) Example 1 The self-leveling material has good characteristics in terms of flow value, SL value, and slurry flow rate in the flow characteristics of the slurry. Furthermore, the Shore hardness of the cured body surface is 30 or more Shore hardness in 2 hours from the construction, and the Shore hardness of 70 or more in 3 hours from the construction, and shows excellent values for the scratch strength of the cured body surface. Yes. Moreover, about the moisture content of the hardened | cured body surface, the value of less than 5% of moisture content is shown 24 hours after slurry construction, and the extremely quick hardening and quick-drying property are shown.
The shrinkage rate of the cured slurry is also small, and good properties are obtained for the finished surface of the cured product.
Further, excellent strength characteristics are obtained with respect to the compressive strength and bending strength of the cured slurry.
(2) In the case of Example 2 in which a water-based acrylic coating flooring was applied to the upper surface of the self-leveling material slurry cured body, Reference Example 2 in which a solvent-type epoxy coating flooring or a solvent-type urethane coating flooring was applied Compared to -4, the adhesion strength of the coated floor finish surface was 10-28% higher. This is because, when the coating floor material used is a solvent type, the solvent component contained in the coating floor material dissolves or alters the polymer component contained in the cured self-leveling material slurry layer, It is assumed that the adhesive strength characteristics were adversely affected.

According to the method for constructing a concrete floor structure in which the self-leveling material and the water-based coating floor material of the present invention are combined, the self-leveling material slurry is applied and cured on the upper surface of the concrete floor having various irregularities and slopes. Since the coating floor material is applied after forming the ground layer having an excellent horizontal level, the finished surface of the coating floor material also has an excellent horizontal level, and good serviceability and aesthetics are obtained.
Further, in the present invention, by using a self-leveling material that can form a floor surface having excellent horizontal level properties by including an appropriate amount of alumina cement, it can be applied extremely efficiently and stably. It is possible to construct a floor foundation.
Furthermore, the concrete structure having a high horizontal level that combines the self-leveling material of the present invention and the water-based type flooring material exhibits a high adhesive strength as compared with the case of combining with the solvent-type flooring material. Therefore, excellent durability characteristics can be obtained as a coated floor finished concrete floor structure.

It is an example of the fragmentary sectional view of the floor structure which constructed the coating floor material on the concrete floor. It is an example of the fragmentary sectional view of the floor structure which constructed the coating floor material on the concrete floor. It is an example of the fragmentary sectional view of the floor structure which constructed the coating floor material on the concrete floor. It is an example of the fragmentary sectional view of the floor structure which constructed the self-leveling material on the concrete floor and constructed the coating floor material. It is a schematic diagram which shows the outline which evaluates the self-leveling property of a hydraulic slurry using a SL measuring device. It is a schematic diagram of the apparatus which measures the length change of the process in which a self-leveling material hardens | cures. It is a schematic diagram which shows an example of the length change at the time of hardening of a self-leveling material. It is a schematic diagram which shows an example of the length change at the time of hardening of another self-leveling material. It is a schematic diagram which shows an example of the length change at the time of hardening of another self-leveling material.

Explanation of symbols

10: Concrete slab 11: Concrete floor 12: Painted floor material 13: Primer layer 14: Base coat layer 15: Top coat layer 16: Floor surface on which the coated floor material is applied 17: Small irregularities 18: (Subtle) slope 19: Concave 20: Convex part 30: Concrete slab 31: Concrete floor 32: Small unevenness 33: (Subtle) slope 34: Self-leveling material primer 35: Self-leveling material slurry 36: Self-leveling material slurry cured body 37: For coating floor material Water-based primer layer 38: Water-based base coat layer 39 for coating floor material: Water-based top coat layer 40 for coating floor material 40: Surface of coated floor 41: Length change measuring device 42: Mold frame 43: Buffer material 44: Eddy current type Displacement sensor 45: SUS disk (75a, 75b, 75c)
46: SUS bar (76a, 76b)
47: Fluororesin sheet

Claims (11)

Construction of a concrete floor structure comprising a step of providing a self-leveling material slurry hardened body layer on the top surface of a concrete floor of a building, and a step of providing a painted floor material hardened body layer on the top surface of the self-leveling material slurry hardened body layer The method of providing a self-leveling material slurry cured body layer includes a step of providing a primer layer for a self-leveling material mortar, and a self-process comprising an alumina cement and a resin powder on the top surface of the primer layer for the self-leveling material mortar. A step of providing a self-leveling material slurry cured body layer by placing and curing a slurry prepared by kneading a leveling material and water, and the step of providing a coated floor material cured body layer is a self-leveling material slurry. Including a step of applying and curing an aqueous base coat for a coating floor on the upper surface of the cured body layer Construction method of the concrete floor structure according to claim. The step of providing the coated floor material cured body layer includes the step of providing an aqueous primer layer for the coated floor material on the upper surface of the self-leveling material slurry cured body layer, and the upper surface of the aqueous primer layer for the coated floor material. The construction method of the concrete floor structure of Claim 1 including the process of constructing and hardening the water-based base coat for materials. The construction method for a concrete floor structure according to claim 1 or 2, wherein the self-leveling material contains a hydraulic component made of alumina cement, Portland cement and gypsum. The self-leveling material includes a hydraulic component and a resin powder, and further includes at least one component selected from an inorganic powder, a fine aggregate, a setting modifier, a fluidizing agent, a thickener, and an antifoaming agent. The construction method of the concrete floor structure of Claims 1-3 characterized by the above-mentioned. The construction method for a concrete floor structure according to any one of claims 1 to 4, wherein the water-based base coat for coating floor material contains a water-based acrylic resin system. The construction method for a concrete floor structure according to any one of claims 1 to 5, wherein the water-based primer for coating floor material includes a water-based acrylic resin system or a water-based epoxy resin system. Apply a water-based base coat for a coating floor material between 1.75 hours and 48 hours after placing a slurry prepared by kneading a self-leveling material and water, or an aqueous primer for a coating floor material The method for constructing a concrete floor structure according to any one of claims 1 to 6, wherein a water-based base coat for a coating floor material is constructed. The concrete floor structure according to any one of claims 1 to 7, wherein the Shore hardness of the surface of the cured self-leveling material slurry is 10 or more after 2 hours from placing (constructing) the slurry. Construction method. The concrete floor structure according to any one of claims 1 to 8, wherein the Shore hardness of the surface of the cured self-leveling material slurry is 50 or more 6 hours after the slurry is placed (constructed). Construction method. The construction method for a concrete floor structure according to any one of claims 1 to 9, further comprising a topcoat layer for a coating floor material provided on an upper surface of the aqueous base coat cured layer of the coating floor material. The concrete floor structure obtained by the construction method of any one of Claims 1-10.

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