JP2008190315A - Concrete floor structure and its construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method capable of efficiently constructing a concrete floor surface structure without largely delaying a work schedule, in the construction method of a concrete structure for avoiding influence of an uneven face and an inclination of a concrete floor on the poured floor finished surface. <P>SOLUTION: A primer layer 34 for self-leveling material mortar is arranged on a concrete floor upper surface of a building. Slurry 35 prepared by kneading a self-leveling material including alumina cement and water, is placed and hardened on its upper surface. A primer layer 37 for a poured floor material is arranged on an upper surface of a self-leveling material slurry hardened body layer 36, and the poured floor material 38 is constructed and hardened on its upper surface. <P>COPYRIGHT: (C)2008,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 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 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, 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 construction amount of the flooring material 12 (base coat layer 14) by applying a wide variety of small irregularities 17 and subtle inclinations 18 on the surface of the concrete floor 11, and seeking a finish with better flatness, 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 a painted floor foundation, the effect 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 necessary to wait for a period of several days to one week until the ground condition for suitably applying the coating floor material, that is, the moisture content of the cured body layer of the self-leveling material is reduced to less than 5% (D value is less than 690). There was a big downside to the construction schedule.

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, this self-leveling material is applied to the concrete floor, and the coated floor material is applied to the upper surface of the concrete floor to obtain a coated floor-finished concrete structure that is excellent in construction efficiency and horizontal level accuracy and has good durability even in service. As a result, the present invention has been completed.

That is, the first of the present invention was prepared by providing a self-leveling material mortar primer layer on the concrete floor of the building, and kneading the water with a self-leveling material containing alumina cement and resin powder on the top surface. A concrete floor characterized in that a slurry is cast and cured, and a primer layer for a coating floor material is provided on the upper surface of the self-leveling material slurry cured body layer, and a base coat for the coating floor material is applied to the upper surface and cured. It is a construction method of a structure.
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.
2) 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.
3) The Shore hardness of the surface of the self-leveling material slurry cured body should be 50 or more after 6 hours from the placement of the slurry.
4) 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 slurry placement (construction).
5) 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%.
6) 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.
7) Self-leveling material slurry is prepared by continuously kneading self-leveling material and water using a mixer mounted on a truck for self-leveling material slurry preparation / construction equipped with a tank for storing the self-leveling material. ,
A self-leveling material slurry is continuously supplied and placed on the upper surface of a concrete floor provided with a primer layer through a slurry hose by a slurry pump mounted on the truck and cured.
8) 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.
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. .
Furthermore, in the present invention, the self-leveling material slurry is continuously prepared by using a truck for self-leveling material slurry preparation and construction (FIG. 5) having a tank for storing the self-leveling material. Construction can be performed by supplying continuously to locations, and particularly excellent construction efficiency can be ensured when constructing on a large concrete floor.

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.

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

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, 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 perform a surface polishing treatment using, for example, to provide a primer layer for a coating floor material on the upper surface, and to harden by placing a coating floor material base coat layer and to cure the surface of the self-leveling material cured body surface and the primer layer for the coating floor material, and It is further preferable because adhesion between the coated floor base coat cured body layer can be further increased.
In the case of performing the polishing treatment, for example, a polishing machine manufactured by LINAX can be suitably used, and the polishing depth is preferably 0.1 to 0.5 mm.

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.

In addition, in the construction method and concrete floor structure of a concrete floor structure combining the self-leveling material and the coating floor material of the present invention, when the construction area is a large area of 200 m ² or more, FIG. It is preferable to use a self-leveling material slurry preparation and construction truck equipped with a tank for storing the self-leveling material as shown, and continuously prepare the self-leveling material slurry and supply it to the construction site continuously. From the viewpoint of construction efficiency and construction quality, a further improved self-leveling material cured body can be obtained.
A self-leveling material slurry preparation / construction truck 51 shown in FIG. 5 has a self-leveling material tank 53 provided with a supply port 52 in the upper part. Then, the self-leveling material slurry preparation / construction truck 51 mixes the self-leveling material and water to produce the self-leveling material slurry 54, and a hopper 56 from the kneading device (mixer) 55 and the self-leveling material tank. And a screw feeder 58 for supplying a necessary amount of the self-leveling material 57 to the kneading device 55.
Furthermore, the self-leveling material slurry preparation / construction truck 51 is provided with a water tank 59 for transporting and supplying water for kneading. Water in the tank is supplied by a water supply pipe 61 by a water supply pump 60. And is supplied to the kneading device 55.
The self-leveling material slurry preparation / construction truck 51 as shown in FIG. 5 is supplied with the self-leveling material 57 from the supply port 51 into the tank 53 with the discharge port closed. And after putting a predetermined amount of self-leveling material in the tank 53, the supply port 52 is closed and it moves to a construction site. After arriving at the construction site, if necessary, the outlet at the bottom of the self-leveling material tank 53 is opened, and the self-leveling material is taken out from there.
The self-leveling material is then controlled by the screw feeder 58 and introduced into the kneading device 55. The kneading device 55 is supplied with water for kneading almost simultaneously from the water tank 59 while adjusting the amount of supplied water. A self-leveling material and water are mixed and stirred at a predetermined ratio by a kneading device 55 to prepare a self-leveling material slurry 54 and stay in the self-leveling material slurry tank 62. The slurry tank 62 can continue stirring the slurry in the slurry tank until the self-leveling material slurry is actually applied.
The self-leveling material slurry 54 is supplied from the slurry tank 62 through the slurry hose 65 to the construction site by the slurry pump 64 to construct the self-leveling material slurry 54 on the concrete floor surface.

  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. Used to prevent permeation.
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.
The coating amount of the primer preferably 80~240g / ^{m 2,} more preferably 90~225g / ^{m 2,} more preferably 100 to 200 g / ^{m 2,} particularly preferably good applying 120~180g / ^{m 2} It is preferable for obtaining a stable adhesive strength.
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 is preferably composed of 20 to 80 parts by mass of alumina cement, 5 to 70 parts by mass of Portland cement, and 5 to 45 parts by mass of gypsum (a total of alumina cement, Portland cement and gypsum is 100 parts by mass). A composition, more preferably 25-70 parts by mass of alumina cement, 10-60 parts by mass of Portland cement and 10-40 parts by mass of gypsum (the total of alumina cement, Portland cement and gypsum is 100 parts by mass), More preferably, the alumina cement is 30 to 60 parts by mass, the Portland cement is 20 to 50 parts by mass, and the gypsum is 15 to 35 parts by mass (the total of the alumina cement, Portland cement and gypsum is 100 parts by mass), particularly preferably the alumina cement. 40-50 parts by weight, Portland Semé 30 to 40 parts by mass and gypsum 20 to 30 parts by mass (the total of alumina cement, Portland cement and gypsum is 100 parts by mass). This is preferable because it is easy to obtain a cured product with low expansion and little volume change during curing.

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.
The resin powder has an effect of improving resistance to the occurrence of cracks and an effect of densifying the hardened body structure in the process in which the shrinkage stress generated by drying leads to the occurrence of cracks.
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-emulsification type resin powder obtained by removing the solvent and drying the aqueous polymer dispersion by a method such as spraying or freeze drying.
As the powder resin, polyacrylic ester resin-based, styrene-butadiene synthetic rubber-based, or vinyl acetate / berobaacrylic copolymer-based ones can be used. Resin powder or acrylic acid ester-methacrylic acid ester copolymer type re-emulsifying resin powder 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, further having a residue on the 300 μm sieve of 3% or less, and more preferably having a residue on the 300 μm sieve of 2% or less can be preferably used.
The resin powder is preferably 0.5 to 20 parts by mass, more preferably 0.6 to 17 parts by mass, still more preferably 0.7 to 14 parts by mass, and particularly preferably 0 to 100 parts by mass of the hydraulic component. What mix | blended 8-10 mass parts 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 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 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 addition amount of the blast furnace slag fine powder is too small, the drying shrinkage of the cured body increases, and if it is too large, the initial strength may be lowered.
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 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, sand 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 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.
Commercially available fluidizing agents such as formaldehyde condensates of melamine sulfonic acid, casein, calcium caseinate, polyethers, polyether polycarboxylic acids, etc., which have a water-reducing effect, are used regardless of the type of fluidizing agent. In particular, commercially available fluidizing agents such as polyether-based polycarboxylic acids such as polyether-based are preferable.
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 addition amount is too small, no suitable effect (excellent fluidity and high cured body strength) will be exhibited, and if the addition amount is too large, an effect commensurate with the addition amount 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 inorganic sodium salts such as sodium sulfate, sodium bicarbonate, sodium tartrate (monosodium tartrate, disodium tartrate), sodium malate, sodium citrates, sodium gluconate, etc. Sodium salts such as sodium salts, oxycarboxylic acids, and the like can be used alone or in combination of two or more components.

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 monosodium tartrate are preferable from the standpoints of setting delay effect, availability, and cost.

When one or more kinds of setting retarders are used, the amount of each setting retarder added is preferably 0.01 to 1.5 parts by mass, more preferably 100 parts by mass with respect to the hydraulic component. 0.1 to 1.2 parts by mass, more preferably 0.2 to 1.0 parts by mass, and particularly preferably 0.25 to 0.8 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, and lithium hydroxide, and organic acid organic lithium salts such as lithium acetate, lithium tartrate, lithium malate, and lithium citrate. 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.

The thickener includes hydroxyethylmethylcellulose, and can be used in combination with other cellulose-based, protein-based, latex-based, and water-soluble polymer-based thickeners other than hydroxyethylmethylcellulose.
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 mortar viscosity is increased and the fluidity may be lowered. Therefore, it is preferably used in the above preferred 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 silicon-based, alcohol-based and polyether-based synthetic substances or 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, preferably 0.001 to 3 parts relative to 100 parts by mass of the hydraulic component. 0.0 part by mass, more preferably 0.005 to 2.5 parts by mass, more preferably 0.01 to 2.0 parts by mass, and particularly preferably 0.02 to 1.7 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 1.1 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, powder resin, 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 the field where the construction area is large, it is preferable to use a self-leveling material slurry preparation and construction truck provided with a tank for storing the self-leveling material shown in FIG. Since it can supply and construct to a construction location continuously, 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, 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 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. The construction thickness is preferably in the range of 2 to 70 mm, more preferably in the range of 2 to 50 mm, more preferably in the range of 2 to 40 mm, particularly preferably in the range of 2 to 30 mm. It is preferable to perform the pouring work in a range.
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.
The pot life of the self-leveling material slurry is preferably 60 minutes from the slurry preparation, more preferably 50 minutes, and particularly preferably 40 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 hours to 24 hours, more preferably 12 hours to 22 hours, more preferably 12 hours to 20 hours, and particularly preferably 12 hours to 18 hours.
By using a self-leveling material excellent in quick curing and quick drying used in the present invention, it is possible to quickly obtain a good cured state and a surface dried state, and the transition to the construction process of the coating floor material which is the next process is possible. It will be possible the next day.

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 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. Further, an organic pigment, an inorganic pigment, a filler such as talc, calcium carbonate, and powdered silica, or a base coat for organic coating floor material containing fine aggregate can be used depending on the application.
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. Moreover, the base coat for inorganic type 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.
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 using the SL measuring instrument shown in FIG. 6, 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 the molding, the weir plate is pulled up, and after the slurry flow 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 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 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. The length change rate was measured by casting the slurry immediately after kneading to the height of the mold inside the mold, starting the measurement of the length change immediately after casting, and measuring the interval every 5 minutes. Measure until the day. The measurement conditions are 20 ° C. and RH 65%.
The rate of change in length of the self-leveling material slurry during curing is the amount of change in the distance between the SUS disc 75b and the end of the displacement sensor 74 (the end on the SUS disc 75b side) shown in FIG. ) Is divided by the distance (480 mm) between the SUS disk 75a and the SUS disk 75c.
FIG. 8, FIG. 9 and FIG. 10 are diagrams schematically showing an example of the change in the length of the sample in the process of curing the self-leveling material slurry.
In FIG. 8, 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. 9, the measurement sample has an age of 0 days (point a) as a base length, and gradually contracts without expanding with hardening, and becomes a length of material age of 28 days (point c). 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. 10, 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. 7, 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７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. 7, 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７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. 7, 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 self-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:
・ Formed mortar 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 primer layer for a coated floor material is provided on a cured layer of a self-leveling material slurry after one day of age and 14 days after the casting of the self-leveling material slurry, and a coated floor material is applied thereon to form a cured body layer. Provide. 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).

(6) Evaluation of dynamic load resistance:
・ Measuring method of caster test:
A primer layer for a coated flooring 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 a coating flooring material thereon. After a curing period until the day, and after the self-leveling material slurry is poured, a primer layer for the coating floor material is provided on the cured layer of the self-leveling material slurry after one day of age, and the coating floor material is applied thereon. A cured body layer is provided, and after a curing period of up to 27 days of age, the dent amount (dynamic load resistance) is measured according to the test method of EN13892-5 (2003). The test apparatus has an operation device that operates a mounting table on which a test body is placed in a right angle direction and a parallel direction, and the mounting table and the rotating shaft of the caster are positioned at right angles to each other and move horizontally. The test conditions were as follows. One steel caster with a load of 2000 ± 10 N was used, and the stroke of the stage on which the test specimen was placed was 390 ± 2 mm stroke width in one direction and 7 ± 0.4 rpm. The direction is 1.72 ± 0.1 rpm with a 260 ± 2 mm stroke width. The process of reciprocating a predetermined area on the specimen is defined as one time, and the operation is repeated 10,000 times. In the measurement, after the operation is finished, four lines are drawn at equal intervals in the perpendicular direction and parallel direction on the surface of the test specimen, and the dent amount at the intersection (16 points) of each line is measured, and the average dent amount is obtained.

(Materials used): The following materials were used.
1) Primer for self-leveling material: U Primer Q, manufactured by Ube Industries
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: Fondue, manufactured by Lafarge Aluminate, 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.
And inorganic ingredients: ground granulated blast furnace slag, River instrument, Chiba River Instrument Co., Ltd., Blaine specific surface area of 4400cm ² / g.
Resin powder: vinyl acetate / versaic acid vinyl ester / acrylic acid ester copolymer, DM2071P manufactured by Nichigo Movinyl Co., Ltd.
-Setting adjuster a: Sodium bicarbonate, manufactured by Tosoh Corporation.
-Setting controller 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-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 and primer a for coating floor material: Epoxy, Infix EF, manufactured by Fujimaru Chemical Co., Ltd.
Primer b: Epoxy-based, Chemicrete E primer, manufactured by ABC Trading Company.
Primer c: Urethane, urethane primer, manufactured by ABC Trading Company.
Primer d: Epoxy, JE-70, manufactured by AICA.
4) Base coat / base coat a for coating floor material: Epoxy, Oncrete 73R, manufactured by Fujimaru Chemical Co., Ltd.
Base coat b: Epoxy-based, Chemicrete E, manufactured by ABC Trading Company.
Base coat c: Urethane, color top DL, manufactured by ABC trading company.
Base coat d: Epoxy, JE-10, manufactured by AICA.
Base coat e: Urethane, JU-20, manufactured by AICA.
5) Topcoat / topcoat for coating floor material: Epoxy, 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 ratios shown in Table 1 under the conditions of room temperature of 20 ° C. and relative humidity of 65% were water 22 with respect to 100 parts by mass of the self-leveling material in Example 1 and Example 2. Each of them is blended at a ratio of parts by mass. For Reference Example 1, blended at a ratio of 26 parts by mass of water with respect to 100 parts by mass of the self-leveling material, kneaded for 3 minutes using a chemistor with a rotation speed of 650 rpm, and self-leveling. A material slurry was prepared.

Preparation of an epoxy-based coating floor material manufactured by Fujimaru Chemical Co., Ltd. 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 with respect to 100 parts by mass of A agent of the epoxy primer for coating floor material, and using a chemistor with a rotation speed of 650 rpm, 3 An epoxy primer for a coating floor material was prepared by kneading for a minute.
(Preparation of base coat for coating floor material)
Under conditions of room temperature of 20 ° C. and relative humidity of 65%, blended 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 base A of epoxy base coat for coating floor, rotation speed 650 rpm Was used for 3 minutes to prepare an epoxy base coat for a coating floor material.
(Preparation of top coat for coating floor material)
Under the conditions of room temperature of 20 ° C. and relative humidity of 65%, a mixing agent at a ratio of 12.5 parts by mass of the curing agent B to 100 parts by mass of the base material A of the epoxy-based topcoat for a coating floor material is used. And kneading for 3 minutes to prepare an epoxy-based topcoat for a coating floor material.

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.

Preparation of the urethane-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%, a primer filler is blended at a ratio of 50 parts by mass with respect to 100 parts by mass of the urethane-based primer for coating floor material, and a chemistor with a rotation speed of 650 rpm is used. The mixture was kneaded for 3 minutes to prepare a urethane primer for a coating floor material.
(Preparation of base coat 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 the curing agent B to 100 parts by mass of the base A of the urethane base coat for the coating floor, and using a Chemistrar with a rotation speed of 650 rpm, 3 This was kneaded for a minute to prepare a urethane base coat for a coating floor material.

The preparation of an epoxy coating material made by AICA 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 100 parts by weight of B agent to 100 parts by weight of A agent of the epoxy primer for coating floor material, and using a chemistor with a rotation speed of 650 rpm, 3 An epoxy primer for a coating floor material was prepared by kneading for a minute.
(Preparation of base coat 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 curing agent B to 100 parts by mass of base A of epoxy base coat for coating floor material, and using a chemistor with a rotation speed of 650 rpm, 3 An epoxy base coat for a flooring material was prepared by kneading for a minute.

Preparation of the urethane-based coating floor material manufactured by AICA 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 100 parts by weight of B agent to 100 parts by weight of A agent of the epoxy primer for coating floor material, and using a chemistor with a rotation speed of 650 rpm, 3 An epoxy primer for a coating floor material was prepared by kneading for a minute.
(Preparation of base coat 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 the curing agent B to 100 parts by mass of the base A of the urethane base coat for the coating floor, and using a Chemistrar with a rotation speed of 650 rpm, 3 This was kneaded for a minute to prepare a urethane base coat for a coating floor material.

[Examples 1 and 2, 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 three types is packed in 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.

[Examples 3 to 4, Reference Example 2]
After applying a primer for self-leveling material to JIS A5304 concrete pavement for pavement and drying to form a primer layer, the self-leveling material slurry was poured and cured to a working thickness of 10 mm, and JASS 15 M-13 According to the rule 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, various coating floor materials were respectively constructed on the self-leveling material slurry cured body layer, and after the coating floor material was cured, the coating floor material was cured for 7 days to obtain specimens of a coated floor finished concrete structure.

[Examples 5 to 9, Reference Example 3]
After applying a primer for self-leveling material to a JIS / A5304 concrete pavement for pavement and drying it, the primer layer is formed, and then the self-leveling material slurry is poured and cured to a working thickness of 10 mm. Thus, a self-leveling material slurry cured body layer was obtained. Next, various flooring materials were applied on the hardened layer of the self-leveling material slurry. After the flooring material was cured, the coating floor was cured for 7 days, and a specimen of a concrete structure with a finished floor for adhesion strength test was prepared. Obtained.
After applying a primer for self-leveling material to a JIS / A5304 concrete pavement for pavement and drying it, the primer layer is formed, and then the self-leveling material slurry is poured and cured to a working thickness of 10 mm. Thus, a self-leveling material slurry cured body layer was obtained. Next, various coating floor materials are respectively applied on the hardened body layer of the self-leveling material and cured for 27 days after the coating floor material is cured to obtain a specimen of a concrete structure for finished flooring for caster test. It was.

Construction of an epoxy-based coating floor material manufactured by Fujimaru Chemical Co., Ltd. was performed by the following method.
Apply and dry the epoxy primer for coating floor using a roller so as to be 150 g / m ² , form a primer layer, and then use a trowel so that the epoxy base coat for coating floor becomes 1 kg / m ^2. A base coat layer was provided by painting. After the base coat for the coating floor material was cured, the epoxy top coat for the coating floor material was applied using a trowel so as to be 1.5 kg / m ² to provide a top coat layer.

The construction of the epoxy coating floor material manufactured by ABC Trading Company was performed by the method shown below.
Apply and dry the epoxy primer for coating floor using a roller so as to be 200 g / m ² , and after forming a primer layer, make the first layer of the epoxy base coat for coating floor 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 .

Construction of the urethane-based coating floor material manufactured by ABC Trading Company was performed by the method shown below.
Apply and dry a urethane primer for coating floor using a roller to 200 g / m ² to form a primer layer, then coat the urethane base coat layer for coating floor to 1.5 kg / m ^2. A base coat layer was provided by applying and coating.

The construction of the epoxy coating floor material manufactured by AICA was performed by the following method.
Apply and dry the epoxy primer for coating floor using a roller so as to be 200 g / m ² , and after forming a primer layer, make the first layer of the epoxy base coat for coating floor 200 g / m ^2. A base coat first layer was provided by applying with a roller. After the first layer of the epoxy base coat for a coating floor was cured, a base coat layer was provided by applying with a roller so that the second layer of the epoxy base coat for the coating floor was 200 g / m ² .

The construction of urethane coating floor material manufactured by AICA was carried out by the method shown below.
Apply and dry an epoxy primer for coating floor using a roller so as to be 200 g / m ² , and after forming a primer layer, make the first layer of urethane base coat for coating floor 500 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 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 was 1.0 kg / m ² . .

Tables 4 and 5 show the results of the adhesion test and the caster property test (evaluation of dynamic load resistance) of the combination of the self-leveling material and the coating floor material used, and these specimens.

(1) The self-leveling material of Reference Example 1 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. A Shore hardness of 66 is obtained. (If the Shore hardness is 45 or more, an operator can ride on the cured body layer)
(2) The self-leveling material of Example 1 and Example 2 showed fluidity almost equal to that of Reference Example 1 in both the flow value and the SL value in the flow characteristics of the slurry. Good characteristics are obtained. Further, the Shore hardness of the cured body surface shows a Shore hardness of 70 or more in 3 hours from the construction, and the scratch strength of the cured body surface also exceeds the strength of Reference Example 1. Moreover, about the moisture content of the hardened | cured body surface, the moisture content less than 5% said to be able to construct | coat a coating floor material satisfactorily can be satisfied in 24 hours after slurry construction, and the extremely excellent quick-hardness and quick-drying property are shown. .
The shrinkage rate of the cured slurry is also smaller than that of Reference Example 1, and the finished surface of the cured product has good properties equivalent to those of the Reference Example.
Furthermore, the strength characteristic which exceeds the reference example 1 is acquired also about the compressive strength and bending strength of a slurry hardening body.
(3) In the adhesion strength test result regarding the specimen in which the coated flooring was applied to the upper surface of the self-leveling material slurry cured body, both Example 3 and Example 4 had an adhesion strength exceeding Reference Example 2, Further, in the results of the caster test (evaluation of dynamic load resistance), in Example 3 and Example 4, values significantly lower than the dent amount in Reference Example 2 were obtained.
(4) The self-leveling material of Example 2 in which the amount of resin powder added is larger than that of Example 1 shows excellent characteristics in bending strength (Table 3) and adhesive strength (Table 4 and Example 4). ing. On the contrary, the self-leveling material of Example 1 in which the amount of the resin powder added is smaller than that of Example 2 is excellent in compressive strength (Table 3) and dynamic load resistance (Table 4, caster test / Example 3). The characteristics are shown. Furthermore, when the self-leveling material of Example 1 is used, even when various coating floor materials are constructed at a short material age of 1 day, a high adhesive strength (Table 5) with respect to various coating floor materials. As well as being obtained, the dynamic load resistance (Table 5, caster property test) shows more excellent characteristics as shown in Example 5.

According to the construction method of the concrete floor structure combining the self-leveling material and the coating floor material of the present invention, it is excellent that the self-leveling material slurry is applied and cured on the upper surface of the concrete floor having various irregularities and slopes. Since the flooring material is applied after forming the ground layer having a horizontal level, the finished surface of the flooring 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.
In addition, the swelling of the hardened layer of the coating floor material due to moisture that tends to be removed from the concrete floor, which has been a problem in the past, includes an appropriate amount of resin powder, has a small dimensional change rate, is dense, and has extremely low air permeability. This can be solved by selecting and using a material and providing a cured body layer using the self-leveling material of the present invention in the intermediate layer between the base concrete and the coated floor cured body layer.
Furthermore, the concrete structure having a high level level that combines the self-leveling material of the present invention and the coated flooring has high strength and high wear resistance, so that it has excellent durability as a floor structure. It is what

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 an example of the truck which mounts the storage tank of a self-leveling material and can prepare and construct a self-leveling material slurry. 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: Truck for preparation and construction of self-leveling material slurry 52: Supply port 53 for self-leveling material 53: Self-leveling material tank 54 : Self-leveling material Lee 55: Kneading equipment (mixer)
56: Hopper 57: Self-leveling material 58: Screw feeder 59: Water tank 60: Water supply pump 61: Water supply pipe 62: Self-leveling material slurry tank 63: Slurry pump 64: Slurry hose 71: Length change measuring device 72: Form 73: Buffer material 74: Eddy current displacement sensor 75: SUS disk (75a, 75b, 75c)
76: SUS bar (76a, 76b)
77: Fluororesin sheet

Claims (10)

A primer layer for a self-leveling material mortar is provided on the upper surface of a concrete floor of a building, and a slurry prepared by kneading a self-leveling material containing alumina cement and resin powder and water is placed on the upper surface and cured, A method for constructing a concrete floor structure, comprising: providing a primer layer for a painted floor material on the upper surface of the cured self-leveling material slurry layer; and applying and curing a base coat for the painted floor material on the upper surface. The construction method for a concrete floor structure according to claim 1, 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 any one of Claims 1-2 characterized by the above-mentioned. The concrete floor structure according to any one of claims 1 to 3, wherein 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. Construction method. 5. The water content of the surface of the self-leveling material slurry cured body is less than 5% (D value = less than 690) 24 hours after the slurry is placed (constructed). 5. 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 6, 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, 8. The self-leveling material slurry is continuously supplied and placed on the upper surface of a concrete floor provided with a primer layer by a slurry pump mounted on a truck, and cured by curing. 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 8, 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 1-9.

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