JP2010019018A - Concrete floor structure and its construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a construction method which can provide a poured floor-finished concrete floor structure with high horizontal leveling performance and excellent adhesive strength characteristics in a short construction period, and the concrete floor structure which can be obtained by the construction method. <P>SOLUTION: This construction method for the concrete floor structure comprises: a step of providing a primer layer 34 for self-leveling material mortar on the top surface 31 of a concrete floor of a building; a step of providing a self-leveling material slurry hardening body layer 36 by placing and hardening slurry 35 prepared by mixing water with a self-leveling material containing alumina cement and resin powder; a step of providing a primer layer 37 for a poured flooring material by coating and drying a primer for the poured flooring material; and a step of providing a base coat layer 38 for the poured flooring material. <P>COPYRIGHT: (C)2010,JPO&INPIT

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 coating floor material, a concrete floor structure having functions such as load 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 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 applied in order to draw out the performance of the coating floor 12 sufficiently. When the construction is performed so that the thickness is constant, the floor surface 16 on which the coating floor material 12 is constructed is a reflection of various small irregularities 17 and subtle slopes 18 on the surface of the concrete floor 11 as a base, In actual use, the finish is also unfavorable in terms of aesthetics.

On the other hand, when improving the flatness of the floor surface 16 on which the coated floor material 12 is constructed and seeking a finish with good usability and aesthetics, in the process of constructing the primer layer 13, the base coat layer 14, and the top coat layer 15, the concrete floor 11 It is necessary to adjust a wide variety of small irregularities 17 and subtle inclinations 18 on the surface by the amount of the coating floor 12 (base coat layer 14) as shown in FIG. 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 issues, when a self-flowing hydraulic composition (self-leveling material) is applied to the concrete floor surface to form a painted floor foundation, the influence of unevenness and inclination of the concrete floor surface on the finished floor surface is avoided. However, if a general self-flowing hydraulic composition (self-leveling material) is used, not only will the number of steps for the construction increase, but also a cured body of the applied self-flowing hydraulic composition (self-leveling material). A curing period is required until the layer develops a predetermined strength. For this reason, the water content of the hardened body layer of the self-flowing hydraulic composition (self-leveling material) is less than 5% as measured by a concrete / mortar moisture meter (D value). Has to wait for a period of several days to a week until it drops to less than 690), which has been an issue in 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.
Furthermore, by applying this self-leveling material to the concrete floor and applying the coating floor material on the top surface, it is excellent in construction efficiency and horizontal level accuracy, and also has excellent adhesive strength characteristics and good durability even in service. The present invention has been completed by finding that a floor-finished concrete structure can be obtained.

That is, the first of the present invention is a step of providing a self-leveling material slurry hardened body layer on the concrete floor upper surface of the building,
A method for constructing a concrete floor structure including a step of providing a coated floor material cured body layer on an upper surface of the self-leveling material slurry cured body layer,
The step of providing a self-leveling material slurry cured body layer is as follows:
Providing a primer layer for a self-leveling material mortar;
A self-leveling material prepared by kneading a slurry prepared by kneading water and a self-leveling material containing alumina cement and an acrylic copolymer resin powder on the upper surface of the self-leveling material mortar primer layer. Providing a slurry cured body layer,
The step of providing the coated floor material cured body layer includes a step of applying a primer for a coated floor material on the upper surface of the self-leveling material slurry cured body layer and drying it, and providing a primer layer for the coated floor material;
A method for constructing a concrete floor structure, comprising a step of applying a base coat for a coating floor material on the upper surface of the primer layer for the coating floor material and curing it to provide a base coat layer for the coating floor material.

  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 self-leveling material contains a hydraulic component made of alumina cement, Portland cement and gypsum, and the acrylic copolymer-based re-emulsified resin powder is a re-emulsified resin of an acrylate-methacrylate copolymer system. Must be powder.
2) The self-leveling material contains a hydraulic component and a resin powder, and further contains at least one component selected from inorganic fine powder, fine aggregate, setting agent, fluidizing agent, thickener and antifoaming agent. Including.
3) The self-leveling material contains 0.5 to 20 parts by mass of resin powder with respect to 100 parts by mass of the hydraulic component.
4) The shore hardness of the surface of the cured self-leveling material slurry is 50 or more after 6 hours from placing (constructing) the slurry.
5) The moisture content on the surface of the cured self-leveling material slurry is less than 5% (D value = less than 690) 24 hours after the slurry is placed (constructed).
6) The self-leveling material slurry cured body has an expansion of the length change rate of 0 to 0.08% and a contraction of the length change rate of -0.08 to 0%.
7) Coating floor materials are epoxy resin coating floor materials, urethane resin coating floor materials, methacrylic resin coating floor materials, acrylic resin coating floor materials, polyester resin coating floor materials, vinyl ester coating floor materials and polymers. It is any one kind of flooring material selected from cement-based flooring materials.
8) The self-leveling material slurry is prepared by continuously kneading the self-leveling material and water using a mixer mounted on a truck for self-leveling material slurry preparation and construction with a tank for storing the self-leveling material. The self-leveling material slurry is continuously supplied and placed on the upper surface of the concrete floor on which the primer layer is provided via the slurry hose by the slurry pump mounted on the truck and cured.
9) A top coat layer for a coating floor material is further provided on the upper surface of the 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. Furthermore, by using an acrylic copolymer-based re-emulsified resin powder as the resin powder, it is possible to provide a concrete floor structure having high durability and high durability.
In addition, with respect to the swelling of the coated floor material hardened layer due to moisture that tends to be removed from the concrete floor, which has been a problem in the past, in the present invention, a self-leveling material having a very small dimensional change rate and air permeability is selected and used. It can be eliminated by providing a hardened layer of dense and high-strength self-leveling material in the intermediate layer between the base concrete and the coated flooring hardened material layer, and excellent durability characteristics as a floor structure can be obtained. .

An example of an embodiment will be described with reference to the drawings shown in FIGS. 4a to 4d regarding a concrete floor structure construction method combining a self-leveling material and a coated floor material of the present invention and a concrete floor structure.

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.

As shown in FIG. 4d, the self-leveling material slurry 35 shown in FIG. 4c supplied and applied to the concrete floor is hardened and the moisture content on the surface of the slurry hardened body is reduced to less than 5% (D value is less than 690). A primer layer 37 for a coating floor material is provided on the upper surface of the self-leveling material slurry cured body layer 36, and a coating floor material base coat layer 38 is placed on the upper surface to be cured.

In the present invention, the self-leveling material primer 34 is applied to the upper surface of the concrete floor 31, the self-leveling material slurry 35 is placed and cured, and then the polishing device is applied to the surface of the self-leveling material slurry cured body layer 36. It is possible to roughen the surface using a coating layer, to provide a primer layer for the coating floor material on the upper surface, and to harden the coating floor material base coat layer by placing the coating floor material base coat layer, and a primer layer for the coating floor material, It is further preferable because adhesion between the coated floor base coat cured body layer can be further increased.
When performing the roughening treatment, for example, an electric floor polisher for business use can be preferably used, and it is preferable to use # 50 to # 200 abrasive paper attached to the polisher.

In the present invention, the top coat 39 for the coated floor material is provided on the upper surface of the cured base coat layer 38 for the coated floor material for the purpose of protecting the surface layer of the cured base coat layer and improving the functions such as durability improvement and slip prevention. It is preferable.

  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 a primer mainly composed of an acrylic-styrene copolymer resin is preferably used. it can.

In order to stably obtain good adhesive strength as the resin solid content contained in the primer,
It is preferable to apply 30 to 120 g / m ² ,
More preferably, 45 to 90 g / m ² is applied.
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 mortar 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 parts by mass) is preferably composed of 20 to 80 parts by mass of alumina cement, 5 to 70 parts by mass of Portland cement and 5-45 parts by mass of gypsum. Composition, more preferably 25-70 parts by weight of alumina cement, 10-60 parts by weight of Portland cement and 10-40 parts by weight of gypsum, more preferably 30-60 parts by weight of alumina cement, 20-50 parts by weight of Portland cement and By using a composition comprising 15 to 35 parts by mass of gypsum, particularly preferably a composition comprising 40 to 50 parts by mass of alumina cement, 30 to 40 parts by mass of Portland cement and 20 to 30 parts by mass of gypsum, it has rapid hardening and low Obtaining a cured product with shrinkage or low expansion and little volume change during curing It preferred for cheap.

  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 densifies the hardened body structure, while also providing base adhesion and surface adhesion. There is an effect to improve.

  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.

Examples of the powder resin include acrylic ester copolymer resin, styrene / acrylic ester copolymer resin, acrylic ester / vinyl acetate / versaic vinyl ester copolymer resin, acrylic ester / methacrylic ester. Re-emulsified resin powders based on copolymer resins and re-emulsified resin powders based on acrylic copolymers such as vinyl acetate / vinyl versatic acid / acrylic acid ester copolymer resins can be used, especially acrylic esters. / Methacrylic acid ester copolymer resin-based re-emulsified resin powder can be suitably used.

The average particle diameter of primary particles (emulsion particles) of the acrylic copolymer re-emulsifying resin powder is preferably in the range of 0.2 to 0.8 μm,
More preferably, it is in the range of 0.25 to 0.75 μm, more preferably in the range of 0.3 to 0.7 μm, particularly preferably in the range of 0.35 to 0.65 μm. Is preferable because it can be obtained in combination with good workability and excellent adhesion, durability and weather resistance obtained by forming a dense polymer film.

  When the average particle size of the primary particles of the re-emulsifying resin powder is larger than the above range, the workability at the time of slurry application is good, but it is not preferable because the adhesiveness and durability of the slurry cured body are lowered. When the average particle size of the primary particles is smaller than the above range, the adhesiveness, durability, and weather resistance of the slurry cured body are good, but it is preferable because the fluidity at the time of slurry construction is lowered and workability is deteriorated. Absent.

  In the present invention, the particle size of the primary particles of the re-emulsifiable resin powder in 100% by mass of the acrylic copolymer-based re-emulsified resin powder, preferably contains 97% by mass or more of 0.1-1 μm particles, Preferably, it contains 95% by mass or more of particles of 0.15-0.9 μm, more preferably 90% by mass or more of particles of 0.2-0.8 μm, particularly preferably particles of 0.3-0.7 μm In the case where the re-emulsification type resin powder contains primary particles having a particle size in the above range, the acrylic copolymer type re-emulsification type resin powder is used. The used self-leveling material slurry has good fluidity and workability, and the self-leveling material slurry cured body can be obtained together with excellent adhesion and durability obtained by forming a dense polymer film. Liked from .

  When the average particle size of the primary particles of the resin powder is larger than the above range, the workability during the construction of the self-leveling material slurry is good, but the adhesiveness and durability of the cured slurry are reduced. When the average particle size of the primary particles is smaller than the above range, the adhesiveness and durability of the slurry cured body are good, but it is not preferable because the fluidity at the time of slurry application is lowered and workability is deteriorated.

  The acrylic copolymer-based re-emulsifying resin powder used in the present invention preferably has primary particles coated with a water-soluble protective colloid of polyvinyl alcohol.

  The surface of the primary particles of the re-emulsified resin powder is coated with a water-soluble protective colloid of polyvinyl alcohol, so that the state of the original emulsion quickly (1 before the resin powder is formed) in the re-emulsification process. Secondary particle state), that is, a state where primary particles are uniformly dispersed in the self-leveling material slurry.

  In the present invention, an acrylic copolymer-based re-emulsifying resin powder is selected that includes the primary particle diameter in the above range within the above range, and the surface of the primary particle is coated with a water-soluble protective colloid of polyvinyl alcohol. By using these, excellent workability can be obtained in the construction process of the self-leveling material slurry, and in the cured self-leveling material slurry, characteristics excellent in adhesion and weather resistance can be obtained.

  The acrylic copolymer-based re-emulsifying resin powder used in the present invention is used in the form of secondary particles in which primary particles are aggregated through a process such as spray drying.

The particle diameter of the secondary particles of the acrylic copolymer-based re-emulsifying resin powder used in the present invention is preferably in the range of 20 to 100 μm, more preferably in the range of 30 to 90 μm.
More preferably, it is in the range of 45 to 85 μm, and particularly preferably in the range of 50 to 80 μm, in the process of kneading the self-leveling material containing the re-emulsifiable resin powder and water into a slurry, Since the secondary particles of the resin powder are easily crushed by the fine aggregate contained in the self-leveling material and easily redispersed, the primary particles tend to be uniformly dispersed. It is preferable to use a re-emulsifying resin powder having

  If the secondary particle size of the re-emulsifying resin powder is larger than the above range, it is difficult to re-disperse during the slurrying process, and the primary particles are not easily dispersed uniformly. If it is smaller than the above range, when the self-flowing hydraulic composition (self-leveling material) is produced by premixing at the factory, the re-emulsification type resin powder is scattered and the working environment is deteriorated. This is not preferable.

The resin powder is preferably 0.5 to 20 parts by mass, more preferably 1.0 to 15.0 parts by mass, and still more preferably 2.0 to 10.0 parts by mass with respect to 100 parts by mass of the hydraulic component. Particularly preferably, a blend of 4.0 to 7.0 parts by mass can be used.
When the ratio of powder resin is larger than the said range, while the viscosity of the slurry obtained by adding water becomes high and workability falls, there exists a tendency for the compressive strength of a hardening body to fall. Moreover, when smaller than the said range, there exists a tendency for the improvement effect of base adhesiveness and surface adhesiveness to fall, and the improvement effect of the tensile strength of a hardening body, and the reduction effect of air permeability 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 fine powder, fine aggregate, setting modifier, fluidization It preferably contains an agent, a thickener and an antifoaming agent.

  The self-leveling material used in the present invention preferably contains at least one inorganic fine powder 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 addition amount of the inorganic fine powder is preferably 10 to 200 parts by weight, more preferably 20 to 162 parts by weight, still more preferably 28 to 154 parts by weight, particularly preferably 100 parts by weight of the hydraulic component. Is preferably 34 to 151 parts by mass.

In the self-leveling material, the amount of blast furnace slag fine powder added is preferably 10 to 200 parts by mass, more preferably 20 to 162 parts by mass, and even more preferably 28 to 154 parts by mass, with respect to 100 parts by mass of the hydraulic component. Preferably it is 34-151 mass parts.
If the addition amount of the blast furnace slag fine powder is not less than the lower limit value of these ranges, the drying shrinkage of the cured product is not so large and becomes an appropriate value, and if it is less than the upper limit value of these ranges, the initial strength is reduced. There is nothing.

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.

As the self-leveling material, a fine aggregate can be further used as necessary.
The fine aggregate is preferably 27 to 500 parts by mass, more preferably 33 to 400 parts by mass, still more preferably 40 to 300 parts by mass, and particularly preferably 49 to 181 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 clinker, silica powder, clay mineral, waste FCC catalyst, inorganic materials such as limestone, crushed urethane, EVA foam, foaming resin A resin pulverized product such as can be used.

  In particular, as fine aggregates, sands such as quartz sand, river sand, sea sand, mountain sand, crushed sand, waste FCC catalyst, quartz powder, alumina 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 can use a fluidizing agent (a water reducing agent such as a high performance water reducing agent) in order to ensure 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 is possible to appropriately select and adjust the pot life and the fast curing / drying properties of the slurry prepared by kneading the self-flowing hydraulic composition (self-leveling material) and water. Since it becomes very easy, it is preferable.

  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, and oxycarboxylic acids 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, the lithium salt which has a setting promotion 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 slurry.

  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 is increased, the viscosity of the self-leveling material slurry is increased and the fluidity may be lowered. Therefore, it is preferably used in the above preferable range.

  The combined use of a thickener and an antifoaming agent has a favorable effect on suppressing separation of aggregates such as hydraulic components and fine aggregates, suppressing generation of bubbles, and improving the surface of the cured body, and a self-leveling material slurry. It is preferable for improving the properties of the cured product.

  As the antifoaming agent, known materials such as silicone-based, alcohol-based, polyether-based synthetic materials, mineral oil-based materials, plant-derived natural materials, and the like 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, preferably 0.001 to 3 parts relative to 100 parts by mass of the hydraulic component. 0.5 parts 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 2.2 parts by mass. The addition amount of the antifoaming agent is preferably within the above range because a suitable antifoaming effect is recognized.

In 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. Further, it is preferable to contain 0.005 to 1.7 parts by mass, more preferably 0.01 to 1.5 parts by mass, and particularly preferably 0.02 to 1.3 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 composed of alumina cement, Portland cement and gypsum, fine aggregate such as powder resin, inorganic fine powder, silica sand, fluidizing agent, thickening agent. Agent, antifoaming agent and setting modifier.

  Mixing hydraulic components and resin powder, inorganic fine powder, fine aggregate, fluidizing agent, thickener, antifoaming agent and setting modifier, etc., to obtain a premix powder of self-leveling material it can.

  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 the slurry of the leveling material can be continuously prepared and continuously supplied to the 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.

  The 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 separation resistance, The strength of the slurry (mortar) cured body 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, and more preferably 0.18 to 0.28. It is preferable to blend and knead so as to be in the range of 0.26, more preferably in the range of 0.19 to 0.25, 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. Is preferably in the range of 2 to 70 mm, more preferably in the range of 2.5 to 50 mm, more preferably in the range of 3 to 40 mm, and particularly preferably in the range of 3 to 40 mm. Pouring is preferably performed in the range of 5 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.

Although the self-leveling material slurry depends on the temperature and humidity conditions at the construction site, it begins to cure for 1 hour to 3 hours after the completion of construction, and the surface hardness of the cured body increases with the progress of curing. The moisture content on the surface of the cured body is reduced.

  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, particularly preferably from the placement (construction) of the slurry. Is 50 or more after 3 hours, and after the slurry application is completed, the rapid progress of curing completes the application of the self-leveling material slurry.

In addition, the moisture content on the surface of the cured self-leveling material slurry is a time required to reach less than 5% (D value is less than 690), which is a moisture content suitable for the construction of the coating floor material (elapsed time from the placement of the slurry). Time) is preferably 12 to 24 hours, more preferably 12 to 22 hours, more preferably 12 to 20 hours, and particularly preferably 12 to 18 hours.
Since the self-leveling material of the present invention has excellent properties in quick-curing and quick-drying, it is possible to quickly obtain a good cured state and a surface-dried state. Transition to will be possible the next day.

In addition, since the self-leveling material of the present invention can obtain a state where the water content of the slurry hardened body surface is less than 5% (D value is less than 690) in a short period of time after placing the slurry as described above. Even when a flooring material is applied to the upper surface of the slurry cured body, moisture detachment and diffusion from the cured body of the self-flowing hydraulic composition that forms the foundation can be suppressed as much as possible, and the upper flooring material cured layer swells. Can be avoided.

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 shrinkage of the change rate is preferably in the range of -0.08 to 0%, more preferably -0.06 to 0%, particularly preferably -0.05 to 0%.
Since the self-leveling material having the above-mentioned expansion or contraction characteristics can prevent cracking of the cured body itself, and can maintain a high adhesive force between the concrete floor as the base and the coating floor material to be applied to the upper layer. preferable.

In addition, if it is out of the above range, cracks may occur due to curing shrinkage of the self-leveling material slurry cured body, and the moisture dissociated from the underlying concrete floor diffuses through the cracks, and the upper-layer coating floor material This is not preferable because the hardened layer may swell or cracks in the hardened body of the self-leveling material slurry may propagate to the coating floor material layer forming the upper layer.

The coating floor material used in the present invention is generally composed of a primer layer, a base coat layer, and a top coat layer. Further, depending on the purpose and application, it is constituted by using a primer layer and a base coat layer, and further provided with a primer layer and then a plurality of base coat layers and top coat layers.
The kind of the flooring material used in the present invention can be appropriately selected from an organic type flooring material or an inorganic type flooring material according to required properties.

The coating floor primer layer used in the present invention is used for improving the adhesion of the coating floor to the base, preventing suction into the base, and preventing pinholes in the coating floor.
Primers for organic coating floor materials used in the present invention are solvent type epoxy resin type, solventless type epoxy resin type, aqueous type epoxy resin type, mixture of aqueous type epoxy resin type and cement, solvent type urethane resin type, solvent type Mixing urethane resin and cement, solvent-free urethane resin, moisture-curing urethane resin, mixing moisture-curing urethane resin and cement, methacrylic resin, solvent-based acrylic resin, water-based acrylic resin, etc. Can be used. Moreover, the primer for coating floor materials containing fillers, such as an organic pigment, an inorganic pigment, or a talc, a calcium carbonate, powdery silica, can be used depending on a use.
Water-based ethylene vinyl acetate resin-based, water-type acrylic resin-based, solvent-type epoxy resin-based, solvent-type acrylic resin-based, etc. can be used as the primer for inorganic coating floor materials used in the present invention.
The primer for the flooring 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 flooring material manufacturer.

The coated floor base coat layer used in the present invention is used for imparting main functions such as durability, mechanical strength and elasticity of the coated floor material.
The base coat for organic coating floor materials used in the present invention is a solvent type epoxy resin type, a solventless type epoxy resin type, a water type epoxy resin type, a solvent type urethane resin type, a solvent type urethane resin type, a moisture curing type urethane resin type A methacrylic resin system, a solvent-type acrylic resin system, a water-based acrylic resin system, a polyester resin system, a vinyl ester resin system, or the like can be used. Depending on the use, one or more base coats selected from organic pigments, inorganic pigments or fillers such as talc, calcium carbonate, and powdered silica, and organic base coats containing fine aggregates may be used. It selects suitably, and can construct and use 1 layer or 2 layers or more.

The base coat for an inorganic coating floor material used in the present invention is a cement material obtained by combining one or more kinds of Portland cement, white Portland cement, super fast cement, special fast cement and alumina cement, and ethylene vinyl acetate. Further, a base coat for a coating floor material composed of one or a combination of two or more synthetic resin emulsions such as styrene butadiene rubber, chloroprene rubber, acrylic and epoxy can be used. In addition, one or two or more base coats selected from base coats for inorganic coating floor materials containing fillers such as organic pigments, inorganic pigments, or talc, calcium carbonate, powdered silica, etc., are selected as appropriate, One layer or two or more layers can be applied and used.
The construction of the base coat for the coating floor material used in the present invention conforms to the construction manual of each coating floor material manufacturer, and can be used by appropriately selecting a trowel, a roller or a brush.

The coated floor material top coat layer used in the present invention is used for the purpose of providing protection and various functions of the base coat layer such as weather resistance, stain resistance, anti-slip property or matte finish.
As top coats for organic or inorganic coating floor materials used in the present invention, solvent type epoxy resin type, solventless type epoxy resin type, aqueous type epoxy resin type, solvent type urethane resin type, solvent type urethane resin type, One or more topcoats selected from moisture-curing urethane resin, methacrylic resin, solvent acrylic resin, aqueous acrylic resin, polyester resin, vinyl ester resin, etc. It can be used by constructing two or more layers.
The construction of the top coat for the coating floor material used in the present invention can be used by appropriately selecting a trowel, a roller, a brush or the like according to the construction manual of each coating floor 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 the slurry flow is stopped, 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. The time for 200 mm is measured, and the measurement time is defined as SL flow velocity (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 performed in an environment of a temperature of 20 ° C. and a humidity of 65%.

(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 casting. The measurement interval of the length change is performed 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 in the distance between the SUS disk 55b and the end of the displacement sensor 54 (end on the SUS disk 55b side) shown in FIG. ) Is divided by the distance (480 mm) between the SUS disk 55a and the SUS disk 55c.

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 along with curing, resulting in a length of material age of 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.

-Measurement method of expansion of length change rate: Using the apparatus shown in FIG. 6, measurement is performed using a measurement sample prepared by the method of measuring 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).

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.

-Moisture content on the surface of the cured product:
The moisture content (D value) of the hardened surface is measured using a concrete / mortar moisture meter (HI-500, manufactured by Kett Scientific Laboratory) at a predetermined elapsed time after the self-leveling material slurry is poured. Based on the “Measurement methods and grades of various qualities of the concrete floor foundation surface layer” by the Japan Floor Construction Technology Research Council, when the measured value D value is less than 690, it is determined that the water content is less than 5%. .

-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 adhesive strength:
・ Measurement method of adhesive strength:
Measured in accordance with NNK-005: 2000 (Japan Paint Floor Industry Association) coating strength test method. A primer layer for a coated floor material is provided on a cured layer of a self-leveling material slurry 14 days after the self-leveling material slurry is poured, and a cured material layer is formed by applying the coated floor material thereon. A square steel jig having an attachment surface of 40 mm × 40 mm is bonded to five places with an adhesive on a hardened layer of a coated floor material after 7 days of age. After the adhesive has hardened, cut along the periphery of the steel jig with a diamond cutter until reaching the hardened layer of the self-leveling material slurry, attach the steel jig to the Kenken-type adhesion tester, and gradually pull the steel jig. 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, manufactured by Ube Mitsubishi Cement Co., Ltd., Blaine specific surface area 4730 cm ² / g.
Gypsum: Type II natural anhydrous gypsum, manufactured by Kokusai Shoji Co., Ltd., Blaine specific surface area of 4030 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 a: Acrylic ester / methacrylic ester copolymer cationic type (re-emulsified resin powder in which primary particles are coated with a water-soluble protective colloid of polyvinyl alcohol), Nippon Synthetic Chemical Co., Ltd., LDM7100P.
Resin powder b: copolymer of acrylic ester / methacrylic ester, manufactured by Nippon Synthetic Chemical Co., Ltd. (re-emulsified resin powder in which primary particles are coated with a water-soluble protective colloid of polyvinyl alcohol), LDM7000P.
Resin powder c: Vinyl acetate / versaic acid vinyl ester / acrylic acid ester copolymer, manufactured by Nippon Synthetic Chemical Co., Ltd., LDM2071P.
-Setting adjuster a: L-sodium tartrate, manufactured by Fuso Chemical Industries.
-Setting adjuster b: Sodium bicarbonate, manufactured by Tosoh Corporation.
-Setting adjuster c: Lithium carbonate, manufactured by Honjo Chemical Co., Ltd.
-Fluidizer: Polycarboxylic acid fluidizer, manufactured by Kao Corporation.
-Thickener: Hydroxyethyl methylcellulose-based thickener, Marporose MX-30000, manufactured by Matsumoto Yushi 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 for coating floor material: Epoxy, manufactured by ABC Trading Company, Chemicrete E primer.
4) Base coat for coating floor material: Epoxy, manufactured by ABC Trading Company, Chemicrete E.

(Preparation of slurry for self-leveling material)
Example 1, Example 2, Example 3, Example 5 and Example 7 were prepared using the self-leveling material and water prepared at the blending ratios shown in Table 1 under conditions of room temperature of 20 ° C. and relative humidity of 65%. It mix | blends in the ratio of 22 mass parts of water with respect to 100 mass parts of self-leveling materials, respectively, and about Example 4, Example 6, and Reference Example 8, it mix | blends with the ratio of 21 mass parts of water with respect to 100 mass parts of self-leveling materials. Then, kneading was carried out for 3 minutes using a Chemistrarer having a rotational speed of 650 rpm to prepare a self-leveling material slurry.

The preparation of an epoxy-based coating floor material manufactured by ABC Trading Company was performed by the method shown below.
(Preparation of 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 and 75 parts by mass of filler for primer with respect to 100 parts by mass of agent A of the epoxy primer for coating floor, rotation speed 650 rpm Were mixed for 3 minutes to prepare an epoxy primer for a coating floor material.
(Preparation of base coat for coating floor material)
Under the conditions of room temperature of 20 ° C. and relative humidity of 65%, blended at a ratio of 20 parts by mass of the curing agent B to 100 parts by mass of the base A of the epoxy base coat for coating floor material, and using a Chemistrar with a rotation speed of 650 rpm, 3 An epoxy base coat for a flooring material was prepared by kneading for a minute.

[Examples 1 to 3]
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 of 20 ° C and relative humidity of 65%, a 3-fold diluted solution of primer for self-leveling material on a concrete plate of 300 mm x 300 mm x 60 mm specified in JIS A 5304 concrete pavement for pavement 180 g / m 2 added) 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), surface moisture content, and surface properties of the cured slurry.

Under conditions of room temperature of 20 ° C. and relative humidity of 65%, a self-leveling material slurry was poured into the length change rate measuring apparatus shown in FIG. Table 3 shows the results of evaluating the length change rate (shrinkage rate) of the cured self-leveling material slurry at the age of 28 days.

[Examples 4 to 8]
After applying a primer for self-leveling material to a JIS A 5304 pavement concrete plate and drying to form a primer layer, the self-leveling material slurry was poured and cured to a construction thickness of 10 mm, and JASS 15M-103 ( In accordance with the provisions of the surface adhesion test specimen described in “Quality Standards for Self-Leveling Material”, the material was cured for 14 days to obtain a cured self-leveling material slurry layer. Next, an epoxy-based coating floor material manufactured by ABC was applied on the hardened layer of the self-leveling material slurry, and cured for 7 days after the coating floor material was cured to obtain a specimen of a concrete structure with a painted floor finish. .

The construction of the epoxy coating floor material manufactured by ABC Trading Company was performed by the method shown below.
Coalescing After a primer layer, an epoxy-based primer coating flooring and coating and drying by using a roller so as to be 200 g / m ^2, so that the first layer of epoxy base coat coating flooring to 300 g / m ² A base coat first layer was formed by applying with a trowel. After the first layer of the epoxy base coat for the coating floor material was cured, the base coat layer was provided by applying with a trowel so that the second layer of the epoxy base coat for the coating floor material was 800 g / m ² .

Table 4 shows the results of evaluating the adhesion test for the combination of the self-leveling material and the coating floor material used, and the specimen.

(1) The self-leveling material used in Examples 1 to 3 is excellent in the fluidity of the slurry and exhibits good rapid hardening because it contains 44% by mass of alumina cement in 100% by mass of the hydraulic component. In the next 6 hours, a Shore hardness of 75 or more was obtained. (If the Shore hardness is 45 or more, an operator can ride on the cured body layer)
Further, the moisture content on the surface of the cured body was less than 5%, which is considered to be suitable for the application of the coating floor material, in 24 hours after the slurry application, and exhibited extremely excellent fast-curing properties and quick-drying properties.
Examples 1 to 3 also showed extremely small values for the shrinkage ratio of the cured slurry, and good properties were obtained for the finished surface of the cured product.
(3) In the adhesion strength test results regarding the specimens in which the flooring material was applied to the upper surface of the self-leveling material slurry cured body, Examples 4 to 8 all obtained an adhesion strength exceeding 4 N / mm ² , In Examples 4 to 7 using the re-emulsified resin powder of the acrylic ester / methacrylic ester copolymer system, an adhesive strength exceeding 4.5 N / mm ² was obtained. In particular, in Examples 4 and 5 using a cation-type re-emulsifying resin powder of an acrylic ester / methacrylic ester copolymer system, an adhesive strength exceeding 5 N / mm ² was exhibited, and particularly excellent adhesiveness was exhibited. It was obtained.

When a concrete floor structure is formed on the upper surface of a concrete floor having various irregularities and slopes by using a coating floor material, the self-flowing hydraulic composition of the present invention is applied and cured to achieve an excellent horizontal level. By forming the coating floor material after forming the underlying layer, the finished surface of the coating floor material also has an excellent horizontal level, and a concrete floor structure having good serviceability and aesthetics is obtained.

Further, in the present invention, as a self-flowing hydraulic composition, a hydraulic component containing an appropriate amount of alumina cement is contained in a certain proportion in the hydraulic composition, so that it is excellent in quick hardening and quick drying, and has an excellent horizontal level. Therefore, it is possible to form a coated floor foundation with high efficiency and stability. Furthermore, by using an acrylic acid copolymer-based re-emulsified resin powder as the resin powder, it is possible to provide a concrete floor structure having excellent durability having high adhesive strength.

In addition, with regard to the swelling of the coated floor material cured layer due to moisture that tends to be detached from the concrete floor, which has been a problem in the past, in the present invention, the self-flowing hydraulic composition described above has a very small dimensional change rate and air permeability. This can be solved by selecting a material and providing a dense and high-strength cured body layer in the intermediate layer between the base concrete and the coated floor cured body layer.
Furthermore, by forming a coating floor base using the self-flowing hydraulic composition of the present invention and performing a painted floor finishing construction, the painted floor finished concrete structure has a high horizontal level and a high adhesive strength. Therefore, excellent durability characteristics as a floor structure can be obtained.

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 Primer layer 38: Base coat layer 39 for coating floor material: Top coat layer 40 for coating floor material: Surface of coated floor 51: Length change measuring device 52: Form 53: Buffer material 54: Eddy current displacement sensor 55: Made of SUS Disc (55a, 55b, 55c)
56: SUS bar (56a, 56b)
57: Fluororesin sheet

Claims (11)

Providing a self-leveling material slurry hardened body layer on the concrete floor of the building;
A method for constructing a concrete floor structure including a step of providing a coated floor material cured body layer on an upper surface of the self-leveling material slurry cured body layer,
The step of providing a self-leveling material slurry cured body layer is as follows:
Providing a primer layer for a self-leveling material mortar;
A self-leveling material prepared by kneading a slurry prepared by kneading water and a self-leveling material containing alumina cement and an acrylic copolymer resin powder on the upper surface of the self-leveling material mortar primer layer. Providing a slurry cured body layer,
The step of providing the coated floor material cured body layer includes a step of applying a primer for a coated floor material on the upper surface of the self-leveling material slurry cured body layer and drying it, and providing a primer layer for the coated floor material;
A method for constructing a concrete floor structure, comprising a step of applying a base coat for a coating floor material on the upper surface of the primer layer for the coating floor material and curing it to provide a base coat layer for the coating floor material. The self-leveling material includes a hydraulic component made of alumina cement, Portland cement and gypsum, and the acrylic copolymer-based re-emulsified resin powder is a re-emulsified resin powder of an acrylate-methacrylate copolymer system. The concrete floor construction method according to claim 1, wherein the concrete floor structure is provided. The self-leveling material includes a hydraulic component and a resin powder, and further includes at least one component selected from an inorganic fine 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 any one of Claims 1-2 characterized by these. The self-leveling material contains 0.5 to 20 parts by mass of a resin powder with respect to 100 parts by mass of a hydraulic component, and the concrete floor structure according to any one of claims 1 to 3 is constructed. Method. The concrete floor structure according to any one of claims 1 to 4, 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 water content of the surface of the self-leveling material slurry cured body is less than 5% (D value = less than 690) after 24 hours from the placement of the slurry (construction). Construction method of concrete floor structure as described in 2. The cured self-leveling material slurry has a length change rate expansion of 0 to 0.08% and a length change rate shrinkage of -0.08 to 0%. Construction method for concrete floor structure according to any one of Coating floor materials are epoxy resin coating floor materials, urethane resin coating floor materials, methacrylic resin coating floor materials, acrylic resin coating floor materials, polyester resin coating floor materials, vinyl ester coating floor materials, and polymer cement coatings. The construction method for a concrete floor structure according to any one of claims 1 to 7, wherein the flooring material is any one kind selected from coating floor materials. The self-leveling material slurry is prepared by continuously kneading the self-leveling material and water using a mixer mounted on a truck for self-leveling material slurry preparation and construction with a tank for storing the self-leveling material, 9. The self-leveling material slurry is continuously supplied and placed on the upper surface of the concrete floor provided with a primer layer by a slurry pump mounted on a truck and cured, and cured. The construction method of the concrete floor structure of Claim 1. The construction method for a 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 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.

Images