JP2009215812A - Concrete floor structure and construction method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a construction method of a concrete structure having painting flooring finish which is applied on the top surface of a concrete floor having a wide variety of small projections and depressions and fine inclination, which is excellent in flatness, firmly integrated, and has high strength properties. <P>SOLUTION: The construction method of the concrete floor structure has the first to fifth processes. In the first process, a primer layer 34 for a self-levelling member is provided on the top surface of the concrete floor of an existing building or a newly-constructed building. In the second process, a self-levelling member slurry 35 is poured and hardened on the top surface of the primer layer 34. In the third process, trowel-pressing processing and/or grinding processing is applied on the surface of a self-levelling member slurry hardening object 36. In the fourth process, a primer layer 37 for a painting flooring is provided on the top surface of the self-levelling member slurry hardening object layer 36. Then in the fifth process, a painting flooring 38 is constructed and hardened on the top surface of the primer layer 37 for the painting flooring. <P>COPYRIGHT: (C)2009,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 floor surface of a concrete structure, and the concrete floor structure.

In concrete floors of structures such as factories and warehouses, in general, coated floor materials containing various resins are often used for finishing the concrete floor surface.
When coated floor materials containing various resins are used as the finishing material, the effect of improving the abrasion resistance and chemical resistance of the floor surface can be obtained, while the coating layer of the coated floor material containing various resins can be cured. When the moisture contained in the concrete floor, which is the foundation layer of the coating floor material, evaporates, the evaporated moisture is confined as vapor between the surface of the concrete floor and the cured coating layer of the coating floor material. In places where sufficient adhesive force is not obtained between the concrete floor surface and the coating film cured layer of the coating floor material, troubles such as blistering in the coating film cured layer of the top coating material are often seen. .

As a method for solving such a problem, in Patent Document 1 and Patent Document 2, a single layer having air permeability is newly spliced on the concrete base surface, and a non-breathable floor finish is applied thereon. Thus, a method for dissipating moisture inside the ground concrete structure in the ventilation layer located under the non-breathable floor finish is disclosed.
Patent Document 3 and Patent Document 4 have a self-leveling property in the placing stage by using a self-leveling material to which a fine foaming agent is added for the breathable base layer provided on the concrete base surface. However, a method is disclosed in which a porous structure having an air permeable / moisture permeable layer can be reliably formed at the time of curing, and water inside the underlying concrete structure is dissipated through the porous layer.

JP 61-45054 A Japanese Patent Publication No.6-21512 Japanese Patent Laid-Open No. 10-317656 JP-A-10-317657

Generally, when a concrete floor is finished by applying a coating floor material, a primer layer is provided on the surface of the concrete floor, and a base coat layer and a top coat layer are then applied. By selecting the kind of coating floor material, it is possible to form a concrete floor having functions such as overweight resistance, abrasion resistance, impact resistance, water resistance, chemical resistance, weather resistance, aesthetics, and soundproofing.
These various functions and performances obtained by applying the flooring material depend greatly on the properties of the cured layer of the flooring material, that is, the thickness and uniformity of the cured layer of the flooring material. In addition, the properties of the hardened layer of the coating floor material are greatly influenced by the strength and surface properties of the concrete 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 previously applied flooring and pasting material was 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, When the concrete floor surface on which the painted floor is applied is actually used, the finished state is 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 the surface of the base coat layer 14 by adjusting the amount of the floor coating 12, specifically the base coat layer 14, by applying a wide variety of small irregularities 17 and subtle slopes 18 on the surface, Excess or deficiency will occur in the construction amount of the coating floor material 12.
As shown in FIG. 2, when the coating floor material 12 is excessively applied in view of safety, the predetermined function and performance can be obtained, but the usage amount of the coating floor material 12 increases and the economic efficiency decreases. On the contrary, as shown in FIG. 3, when the usage amount of the coating floor material 12 is a recommended construction amount per unit area, the thickness of the hardened layer of the coating floor material 12 is thicker in the recess 19. In addition, the convex portion 20 becomes thin, and in particular, the convex portion 20 with a small amount of construction of the coating floor material 12 may cause a situation in which an appropriate function and performance cannot be obtained as compared with the case where the coating floor material 12 is applied in a predetermined amount. become.

The present invention relates to a method for constructing a concrete floor structure with a coated floor finish that has excellent flatness on a top surface of a concrete floor having a wide variety of small irregularities and subtle slopes, and is firmly integrated and has high adhesive strength characteristics. The purpose was to provide.

As a result of intensive studies on the above problems, the present inventors have used a self-leveling material that includes a hydraulic component having a fast setting property and is excellent in horizontal level accuracy, while achieving a high level of construction efficiency and a good flat surface. In addition to forming a coating floor material base layer having properties, a specific processing treatment is performed on the surface layer of the self-leveling material, thereby providing high bonding properties between the coated floor material cured body layer and the self-leveling material cured body layer. The present invention was completed by finding that it was possible to form a coated floor finished concrete structure that was obtained and had excellent adhesive strength properties.

That is, the first of the present invention is
Concrete including a step of providing a self-leveling material slurry cured body layer on the upper surface of a concrete floor of an existing building or a new building, and a step of providing a coated floor material cured body layer on the upper surface of the self-leveling material slurry cured body layer It is a construction method of a floor structure, and the step of providing a self-leveling material slurry cured body layer includes a step of providing a primer layer for a self-leveling material on the top surface of a concrete floor of a building, and a self-leveling material on the top surface of the primer layer. Including a step of placing and curing the slurry to form a self-leveling material slurry cured body layer, and a step of pressing and / or polishing the surface of the self-leveling material slurry cured body layer. The step of providing a layer is performed on the upper surface of the self-leveling material slurry cured body layer that has been subjected to the pressing process and / or the polishing process. Concrete comprising: a step of providing a primer layer for a flooring material; and a step of providing a basecoat layer for a flooring material by applying and curing the basecoat for the flooring material on the upper surface of the primer layer for the flooring material. It is a construction method of a floor structure.
A second aspect of the present invention is a painted floor finished concrete floor structure obtained by the above-described method for constructing a concrete floor structure of the present invention.

The preferable aspect of the construction method of the concrete floor structure of this invention is shown below. A plurality of these can be combined.
1) The surface of the cured body is pressed while the Shore hardness of the surface of the self-leveling material slurry cured body layer is 1 to 15.
2) The surface of the cured body is polished while the Shore hardness of the surface of the self-leveling material slurry cured body layer is 35-80.
3) The surface of the cured body is pressed while the shore hardness of the surface of the self-leveling material slurry cured body layer is 1 to 15, and the cured body is cured while the shore hardness of the surface of the slurry cured body layer is 35 to 80. Polishing the surface.
4) The self-leveling material should contain alumina cement.
5) The self-leveling material contains a hydraulic component composed of alumina cement, Portland cement and gypsum, calcium hydroxide fine powder, and fly ash fine powder.
6) The flooring material is a resin-based flooring material or a cement-based flooring material.
7) The step of providing a coated floor material cured body layer includes:
A step of further applying a top coat for a coating floor material on the upper surface of the base coating layer for the coating floor material and drying the coating to form a top coating layer for the coating floor material.

According to the method for constructing a concrete floor structure in which the self-leveling material and the coated floor material of the present invention are combined, the horizontal level accuracy is usually excellent on the upper surface of the concrete floor having a wide variety of small irregularities and subtle inclinations. Since the flooring material is applied after the self-leveling material slurry is applied and cured to form a concrete base with high flatness, the finished surface of the flooring material also has high flatness, good serviceability and aesthetics. As well as the functions and performances inherently possessed by the coating floor material.
Furthermore, in the present invention, by selecting and using a self-leveling material that includes alumina cement and has excellent fast-curing property and can form a floor surface having high flatness, it is possible to achieve both high construction efficiency and excellent horizontal level accuracy. Formation of formation is possible.
Further, in the present invention, the surface of the self-leveling material slurry cured body is pressed and / or the surface of the self-leveling material slurry cured body is polished to obtain an extremely dense and high-strength slurry of the self-leveling material. By forming the hardened body layer as an intermediate layer between the base concrete and the hardened flooring material layer, the swollen surface of the hardened flooring material due to moisture that tends to be detached from the concrete floor, which has been a problem in the past, has also occurred. It is possible to obtain a coated floor finished concrete floor structure that can be eliminated and has excellent durability characteristics.

The present invention
Concrete including a step of providing a self-leveling material slurry cured body layer on the upper surface of a concrete floor of an existing building or a new building and a step of providing a coated floor material cured body layer on the upper surface of the self-leveling material slurry cured body layer A method for constructing a floor structure, comprising a step of pressing and / or polishing a surface of a cured self-leveling material slurry layer, and a method for constructing a concrete floor structure.
A concrete floor structure construction method combining a self-leveling material and a coated floor material of the present invention and a painted floor finished concrete floor structure will be described with reference to the drawings shown in FIGS. 4a to 4d.

FIG. 4 a shows a partial cross-sectional view of the concrete floor 30.
In the present invention, as shown in FIG. 4b, first, a primer 34 for a self-leveling material is applied to the upper surface of a concrete floor 31 having 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.
In the present invention, when the self-leveling material slurry 35 is hardened at the initial stage, that is, when the shore hardness of the surface of the self-leveling material slurry cured body 36 is 1 to 15, the entire surface of the slurry cured body layer is removed using a plasterer or the like. Process the presser foot.
After further hardening of the self-leveling material slurry cured body 36, 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 as shown in FIG. Preferably, the base coat 38 is cast and cured.

Further, in the present invention, a 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 the Shore hardness of the surface of the slurry hardened body layer is between 35 and 80. It is preferable to polish the surface of the slurry cured body layer 36, provide a primer layer for a coating floor material on the upper surface, and apply a base coat 38 of the coating floor material to cure.

Further, in the present invention, a self-leveling material primer 34 is applied to the upper surface of the concrete floor 31 and a self-leveling material slurry 35 is placed, and the self-leveling material slurry 35 is initially cured, that is, the self-leveling material slurry cured body layer 36. While the shore hardness of the surface of the slurry is between 1 and 15, the entire surface of the slurry cured body layer is pressed by using a plasterer or the like, the curing of the slurry cured body further proceeds, and the shore hardness of the surface of the cured body is increased. More preferably, after polishing the surface of the slurry cured body layer 36 between 35 and 80, a primer layer 37 for a coating floor material is provided on the upper surface thereof, and a base coat 38 of the coating floor material is cast and cured.

In the present invention, the top coat layer 39 can be provided on the upper surface of the base coat layer 38 of the coating floor material. The top coat layer 39 provides not only a function of protecting the base coat layer 38 of the coating floor material but also an effect of improving the durability of the surface 40 of the coated floor finish concrete floor structure.

In the construction method of the concrete floor structure according to the present invention, it is preferable that the surface of the self-leveling material slurry cured body layer is subjected to the pressing process and / or the polishing process at a specific timing.
Next, the presser foot pressing process and / or the polishing process performed in the present invention will be described.

In the present invention, it is preferable to perform a presser foot treatment on the surface of the cured self-leveling material slurry during the curing of the self-leveling material slurry.
As the timing to perform the heel pressing process, the Shore hardness of the surface of the self-leveling material slurry cured body is preferably between 1 and 15, more preferably between 2 and 14, and particularly preferably between 3 and 13. In this state, the surface of the hardened body of the self-leveling material slurry is densified by pressing the entire surface of the hardened slurry body using a plasterer or the like to obtain a higher strength. Can do.

Moreover, in this invention, after the self-leveling material slurry is hardened, it is preferable to polish the surface of the self-leveling material slurry cured body layer.
As the timing of the polishing treatment, the Shore hardness of the surface of the self-leveling material slurry cured body layer is preferably between 35 and 80, more preferably between 38 and 77, and particularly preferably between 40 and 75. In this state, it is preferable to perform a polishing process using a polishing machine manufactured by LINAX.
The depth to be polished is preferably 0.02 to 1.0 mm, more preferably 0.05 to 0.7 mm, and particularly preferably 0.1 to 0.5 mm.
By polishing the surface of the slurry cured body layer, the roughness of the surface of the cured body can be appropriately increased, and there is an effect of improving the bonding property with the coating floor material layer on the upper surface of the cured body. This is presumably due to the improvement of the anchor effect at the joint interface.

In the present invention, it is preferable that a claw-pressing process is performed on the surface of the self-leveling material slurry cured body during the curing of the self-leveling material slurry, and the surface of the slurry cured body layer is further polished.
The heel presser treatment is performed in such a state that the Shore hardness of the surface of the self-leveling material slurry cured body layer is preferably between 1 and 15, more preferably between 2 and 14, and particularly preferably between 3 and 13. In addition, the entire surface of the slurry cured body is subjected to a pressing process using a plasterer or the like, the surface layer structure of the slurry cured body layer is consolidated, and the Shore hardness of the surface of the slurry cured body is preferably between 35 and 80, More preferably, the polishing treatment is performed using a polishing machine manufactured by LINAX Co., Ltd. in a state where the value is between 38 and 77, particularly preferably between 40 and 75.
The effect of densifying the hardened body structure by the pressing process and the effect of improving the bonding strength of the hardened body surface by the polishing process are obtained, and the upper surface of the slurry hardened body layer and the lower surface of the hardened body layer of the coating floor material are obtained. A strong bonding state can be formed between them.

Next, the material used with the construction method of the concrete floor structure of this invention is demonstrated.
The primer for the self-leveling material used in the present invention has the effect of preventing the water in the slurry from penetrating into the concrete floor when the self-leveling material slurry is placed, and the air in the pores of the concrete floor It has the effect of preventing the formation of bubbles on the surface of the slurry layer by passing through the self-leveling material slurry, and further has the effect of firmly bonding the concrete floor and the cured self-leveling material slurry.
As a primer for a self-leveling material, a commercially available primer mainly composed of a styrene / acrylic acid ester copolymer resin or an ethylene / vinyl acetate copolymer can be used, and in particular, a styrene / acrylic acid ester copolymer resin as a main component. Can be used suitably.
The primer coating amount is preferably 20 to 240 g / m ² , more preferably 30 to 200 g / m ² , more preferably 40 to 150 g / m ² , and particularly preferably 45 to 120 g / m ^2. This is preferable in order to obtain 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.

  Next, the self-leveling material used in the present invention will be described in detail.

As the self-leveling material used in the present invention, the self-leveling material slurry cured body has a property of gradually increasing the hardness while having a suitable water retention property on the surface layer of the cured body layer at the initial stage of curing. Since it is possible to sufficiently exhibit the effect of densifying the surface layer structure by the treatment, and after exceeding the surface hardness preferred for the heel presser treatment, it is preferable that excellent construction efficiency is obtained by expressing a good rapid effect, It is preferable to select and use a specific self-leveling material.

As the self-leveling material used in the present invention, a self-leveling material containing alumina cement as a hydraulic component can be preferably used because it has an excellent fast-curing property.
Further, as a self-leveling material used in the present invention, a self-leveling material containing a hydraulic component composed of alumina cement, Portland cement and gypsum, calcium hydroxide fine powder, and fly ash fine powder is self-leveling material slurry hardening. While the body has moderate water retention property on the surface of the cured body layer at the initial stage of curing, it has the property of gradually increasing hardness, and can sufficiently exert the effect of densifying the surface layer structure by the heel pressing process, After exceeding the surface hardness preferred for the tacking treatment, it can be particularly preferably used since it exhibits a good rapid effect and provides excellent construction efficiency.

<Hydraulic component>
The self-leveling material used in the present invention preferably contains a hydraulic component made of alumina cement, Portland cement and gypsum, calcium hydroxide fine powder, and fly ash fine powder.

  In the self-leveling material used in the present invention, the use of a hydraulic component made of alumina cement, Portland cement and gypsum as the hydraulic component can provide a self-leveling material having excellent work clamp workability and quick hardening. Is particularly preferred. Therefore, it is not preferable to add other hydraulic components such as calcium fluoroaluminate clinker to the self-leveling material used in the present invention. The composition of the hydraulic component is preferably 20 to 80% by mass of alumina cement, 5 to 70% by mass of Portland cement, and 5 to 45% by mass of gypsum when the total mass of alumina cement, Portland cement and gypsum is 100% by mass. It is. The composition of the hydraulic component is more preferably 25 to 70% by mass of alumina cement, 15 to 60% by mass of Portland cement, and 10 to 40% by mass of gypsum. The composition of the hydraulic component is more preferably 30 to 60% by mass of alumina cement, 20 to 50% by mass of Portland cement, and 15 to 35% by mass of gypsum. The composition of the hydraulic component is particularly preferably 35 to 45% by mass of alumina cement, 30 to 40% by mass of Portland cement and 20 to 30% by mass of gypsum. By using a self-leveling material having such a composition, a self-leveling material slurry having excellent self-fluidity can be obtained, and further, it has fast curing, low shrinkage or low expansion and little volume change during curing. It is preferable because a cured product can be easily obtained.

  Portland cement, one of the hydraulic components of the self-leveling material used in the present invention, is Portland cement such as ordinary Portland cement, early-strength Portland cement, ultra-high-strength Portland cement, moderately hot Portland cement, low heat Portland cement and white Portland cement. Can be used. In addition, as a hydraulic component of the self-leveling material used in the present invention, a mixed cement obtained by mixing Portland cement and other components, for example, a mixed cement such as blast furnace cement, fly ash cement, and silica cement can be used.

  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.

  As the gypsum, various gypsums such as anhydrous gypsum, hemihydrate gypsum, and dihydrate gypsum can be used as one kind or a mixture of two or more kinds of these gypsums regardless of the kind. Gypsum is a component having a function of maintaining dimensional stability after the self-leveling material slurry obtained by kneading the self-leveling material and water.

  The anhydrous gypsum that can be used in the present invention is not particularly limited with respect to its production method, and is produced by natural anhydrous gypsum, hydrofluoric acid gypsum (anhydrous gypsum) by-produced in the hydrofluoric acid production process, and flue gas desulfurization process. Exfoliated gypsum (anhydrous gypsum) or the like can be used, and hydrofluoric acid gypsum (anhydrous gypsum) can be preferably used, particularly from the viewpoint of availability, economy, and environmental friendliness.

<Calcium hydroxide fine powder>
The calcium hydroxide fine powder contained in the self-leveling material used in the present invention is a component having a function of adjusting the expression time of the self-leveling material slurry surface hardness that enables early light walking. By mixing calcium hydroxide fine powder in an appropriate amount with respect to the hydraulic component, it can function effectively as a setting accelerator, and can self-treat the surface of the construction quickly after the self-leveling material slurry is applied. A leveling material or a self-leveling material slurry can be obtained. The production method of the calcium hydroxide fine powder is not particularly limited, and a commercially available product can be used.

  The self-leveling material used in the present invention is preferably 0.01 to 1 part by weight, more preferably 0.05 to 0.8 parts by weight, and still more preferably, calcium hydroxide fine powder with respect to 100 parts by weight of the hydraulic component. Contains 0.1 to 0.5 parts by mass, particularly preferably 0.2 to 0.3 parts by mass. When the calcium hydroxide fine powder in the self-leveling material used in the present invention is in such a range, it is possible to impart moderate fast hardening at the initial stage of hydration of the hydraulic component, and hardening of the self-leveling material slurry. It is preferable because light walking is possible early from the start. If the amount of calcium hydroxide fine powder added is less than the above range, the early hardness of the slurry cured body cannot be obtained, and if added beyond the above range, the effect of promoting the curing becomes excessive and the surface of the slurry cured body is pressed. Therefore, there is a possibility that it may be difficult to secure a sufficient time for the purpose, so the amount of calcium hydroxide fine powder added is preferably within the above range.

As the calcium hydroxide fine powder, a powder having a specific surface area of 5000 to 30000 cm ² / g, preferably a powder having a specific surface area of 1000 to 25000 cm ² / g, more preferably a powder having a specific surface area of 12,000 to 20000 cm ² / g, Preferably, the main component is a powder having a Blaine specific surface area of 14,000 to 18000 cm ² / g. In addition, the Blaine specific surface area of a calcium hydroxide fine powder is measured by the method prescribed | regulated to JIS * R-5201.

  The particle diameter range of the calcium hydroxide fine powder contained in the self-leveling material used in the present invention includes 80 mass% or more of particles having a particle diameter of more than 1 μm and 48 μm or less in 100 mass% of the calcium hydroxide fine powder. The particle diameter is more than 1 μm and 4 μm or less is in the range of 20 to 40% by mass, the particle diameter is more than 4 μm and the particle of 12 μm or less is in the range of 25 to 45% by mass, and the particle diameter is 12 μm. Exceedingly, it is preferable that the particle | grains of 48 micrometers or less are the range of 20-40 mass%. In particular, the particle size range of the calcium hydroxide fine powder contained in the self-leveling material used in the present invention is 90% by mass of particles having a particle diameter of more than 1 μm and 48 μm or less in 100% by mass of the calcium hydroxide fine powder. Inclusive, particles having a particle diameter of more than 1 μm and particles of 4 μm or less are in the range of 28 to 33% by mass, particles having a particle diameter of more than 4 μm and particles of 12 μm or less are in the range of 33 to 38% by mass, More preferably, the particle size is more than 12 μm and not more than 48 μm in the range of 25-30% by mass. In the present invention, by adding an appropriate amount of calcium hydroxide fine powder having such a particle size range in the self-leveling material, it is possible to impart moderate rapid hardening at the initial stage of hydration of the hydraulic component. In addition, it is possible to ensure a semi-cured state suitable for the pressing work on the surface of the slurry cured body. The particle diameter can be measured using a laser diffraction particle diameter measuring apparatus.

<Fly ash fine powder>
The fly ash fine powder contained in the self-leveling material used in the present invention can maintain the water retention of the surface layer of the slurry cured body at the initial stage of curing appropriately for a long time, and can impart the effect of forming a construction surface that can be easily pressed. Therefore, an appropriate amount of fly ash fine powder is blended with respect to the hydraulic component as a water retention agent.

  The appropriate amount of fly ash fine powder in the self-leveling material used in the present invention is preferably 0.5 to 5 parts by mass, more preferably 1 to 4 parts by mass, and even more preferably 1 to 100 parts by mass of the hydraulic component. .5 to 3.5 parts by mass, particularly preferably 2 to 3 parts by mass. When the fly ash fine powder in the self-leveling material is in such a range, it is preferable because appropriate water retention can be stably maintained on the surface of the slurry cured body at the beginning of curing, and good work clamp workability can be obtained. .

The fly ash fine powder is a powder having a specific surface area of 2500 to 7000 cm ² / g, preferably a powder having a specific surface area of 2800 to 6500 cm ² / g, more preferably a powder having a specific surface area of 3000 to 6000 cm ² / g, particularly preferably Is preferably composed mainly of a powder having a Blaine specific surface area of 3300 to 5500 cm ² / g. In addition, the brane specific surface area of fly ash fine powder is measured by the method prescribed | regulated to JIS * R-5201.

  The particle size range of the fly ash fine powder contained in the self-leveling material used in the present invention is such that 100% by mass of the fly ash fine powder contains 80% by mass or more of particles having a particle size of more than 2 μm and 48 μm or less. Particles having a diameter exceeding 2 μm and having a particle diameter of 12 μm or less are in the range of 30 to 50% by mass, particles having a particle diameter exceeding 12 μm and having a particle diameter of 24 μm or less are in the range of 20 to 40% by mass, and the particle diameter is 24 μm. Exceedingly, it is preferable that the particle | grains of 48 micrometers or less are the range of 15-35 mass%. In particular, the particle diameter range of the fly ash fine powder contained in the self-leveling material used in the present invention includes 90% by mass or more of particles having a particle diameter of more than 2 μm and less than 48 μm in 100% by mass of fly ash fine powder. The particle diameter is in the range of 38 to 42% by mass, the particle diameter is in the range of 38 to 42% by mass, the particle diameter is in the range of 28 to 32% by mass, and the particle diameter is in the range of 28 to 32% by mass. More preferably, the particle size is more than 24 μm and not more than 48 μm in the range of 22 to 26% by mass. In the present invention, by containing an appropriate amount of fly ash fine powder having such a particle size range in the self-leveling material, it is possible to stably maintain appropriate water retention on the surface of the slurry cured body at the beginning of curing. The work clamp workability can be obtained. The particle diameter can be measured using a laser diffraction particle diameter measuring apparatus.

  In the present invention, the calcium hydroxide fine powder and the fly ash fine powder are used in combination, so that the heel presser work can be carried out at an early stage while being fast-hardened, and several tens of minutes after the heel presser work can be performed. During this, the state in which the surface of the slurry cured body is appropriately retained can be maintained for a long time, and the work for pressing the surface of the slurry cured body can be easily performed.

<Other optional components>
The self-leveling material used in the present invention preferably contains a fine aggregate and a fluidizing agent in addition to the hydraulic component, the calcium hydroxide fine powder, and the fly ash fine powder. Further, the self-leveling material prepared by kneading the self-leveling material used in the present invention and water, further comprising at least one component selected from inorganic components, setting retarders, resin powders, thickeners and antifoaming agents. It is preferable that the material slurry has self-fluidity. In the present specification, the “self-fluidizing” self-leveling material slurry means a self-leveling material slurry having a flow value described later of 190 mm or more.

<Fine aggregate>
The self-leveling material used in the present invention is preferably 50 to 500 parts by mass, more preferably 100 to 400 parts by mass, and still more preferably 150 to 300 parts by mass, with respect to 100 parts by mass of the hydraulic component. Preferably 150-250 mass parts is included.

  As the fine aggregate, an aggregate having a particle size of 2 mm or less, preferably an aggregate having a particle size of 0.1 to 2 mm, more preferably an aggregate having a particle size of 0.2 to 1.5 mm, particularly preferably 0.3 to The main component is 1 mm aggregate. The particle size of the fine aggregate can be measured by a method using several sieves with different nominal dimensions as defined in JIS Z-8801.

  Fine aggregates include sands such as quartz sand, river sand, sea sand, mountain sand and crushed sand, alumina clinker, silica powder, clay minerals, waste FCC catalyst and inorganic materials such as limestone, crushed urethane, EVA foam and foaming resin, etc. A resin pulverized product or the like can be used. In particular, sand, quartz powder, alumina clinker and the like can be preferably used as the fine aggregate.

<Fluidizer>
By adding a fluidizing agent to the self-leveling material used in the present invention, self-fluidity can be imparted to the self-leveling material used in the present invention. Therefore, the addition of a fluidizing agent to the self-leveling material used in the present invention is preferable because workability during construction can be improved.

  Regardless of the type of fluidizing agent, any formaldehyde condensate of melamine sulfonic acid, casein, calcium casein, polyether, etc., which has a water reducing effect, such as polyether polycarboxylic acid, lignin sulfonic acid, etc. These commercially available products can be used. In the present invention, these components can be used alone or in combination of two or more components, and in particular, a polycarboxylic acid type fluidizing agent and a lignin sulfonic acid type fluidizing agent are used in combination. Is preferable because suitable flow characteristics can be stably obtained.

  The fluidizing agent can be appropriately added within a range that does not impair the characteristics, depending on the hydraulic component used in the self-leveling material used in the present invention. Specifically, with respect to the self-leveling material used in the present invention, the fluidizing agent is 0.01 to 5 parts by mass, more preferably 0.05 to 3 parts by mass with respect to 100 parts by mass of the hydraulic component. Preferably 0.1 to 2 parts by mass, particularly preferably 0.2 to 1 part by mass is added. If the amount added is equal to or greater than the lower limit of these ranges, a sufficient effect for improving self-fluidity can be exhibited, and if it is equal to or less than the upper limit of these ranges, an effect commensurate with the amount added can be expected. Therefore, it is economical, and it is considered that the amount of kneading water for obtaining the required fluidity does not increase, and at the same time, the viscosity does not increase and the filling property does not deteriorate.

<Inorganic component>
The self-leveling material used in the present invention contains at least one inorganic component selected from blast furnace slag fine powder, limestone powder, and silica fume as inorganic components, and particularly contains blast furnace slag fine powder. By containing these inorganic components, the crack resistance of the cured product due to drying shrinkage can be increased, and the cost can be reduced, which is economical.

  The amount of the inorganic component added to the self-leveling material used in the present invention is preferably 10 to 350 parts by mass, more preferably 30 to 200 parts by mass, and still more preferably 50 to 150 parts per 100 parts by mass of the hydraulic component. It is preferable to set it as a mass part, Especially preferably, it is 70-130 mass parts.

  In the self-leveling material, when the inorganic component is blast furnace slag fine powder, the addition amount of the blast furnace slag fine powder is preferably 10 to 350 parts by mass, more preferably 30 to 200 parts per 100 parts by mass of the hydraulic component. It is preferable to set it as a mass part, More preferably, it is 50-150 mass part, Most preferably, it is 70-130 mass part. If the amount of blast furnace slag fine powder added is equal to or greater than the lower limit of these ranges, the drying shrinkage of the cured product is not large and is an appropriate value, and if it is less than the upper limit of these ranges, the initial strength is reduced. There is no.

As the blast furnace slag fine powder, those having a brain specific surface area of 3000 cm ² / g or more as defined in JIS A 6206 can be used.

<Set retarder>
The setting retarder to be added to the self-leveling material used in the present invention can be appropriately added within a range that does not impair the characteristics, depending on the hydraulic component used in the self-leveling material and components other than the hydraulic component. Moreover, the pot life and quick-hardness of the self-leveling material used by this invention can be adjusted by selecting suitably the component, addition amount, and mixing ratio of a setting retarder. The addition of a setting retarder to the self-leveling material is preferable because it can be very easily used as a self-leveling material slurry (self-fluidizing slurry).

  As the setting retarder, a known setting retarder can be used. Examples of setting retarders include organic acids such as sodium tartrate (monosodium tartrate, disodium tartrate), sodium malate, sodium citrate, and sodium gluconate, and their sodium salts and sodium sulfate. Inorganic sodium salts such as sodium bicarbonate, sodium phosphate, sodium polyphosphate, sodium tripolyphosphate, etc. can be used alone or in combination of two or more components. In particular, the setting retarder is preferably a sodium salt of an organic acid and / or an inorganic acid from the standpoints of setting retarding effect, availability, and cost, and it is possible to use an organic acid and a sodium salt of an inorganic acid in combination. Further preferred.

  Oxycarboxylic acids include oxycarboxylic acids and their salts. Examples of the oxycarboxylic acid include citric acid, gluconic acid, tartaric acid, glycolic acid, lactic acid, hydroacrylic acid, α-oxybutyric acid, glyceric acid, tartronic acid, malic acid, and other aliphatic oxyacids, 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 the oxycarboxylic acid salt include alkali metal salts (specifically sodium salt and potassium salt) of oxycarboxylic acid and alkaline earth metal salts (specifically calcium salt, barium salt and magnesium salt). Can be mentioned.

  The setting retarder added to the self-leveling material used in the present invention is preferably in the range of 0.01 to 1.5 parts by mass, more preferably 0.1 to 100 parts by mass of the hydraulic component in the self-leveling material. It can be used in the range of -1.2 parts by mass, more preferably in the range of 0.2-1.0 parts by mass, particularly preferably in the range of 0.3-0.8 parts by mass. If the addition of the setting retarder is within these ranges, suitable fluidity can be obtained, the surface hardness at the time of curing can be moderated without significantly delaying the curing start time, and light walking is possible. It is preferable because sufficient hardness can be secured after the surface hardness of the cured slurry is obtained.

<Thickener>
The thickener added to the self-leveling material used in the present invention includes hydroxyethyl methylcellulose, and is used in combination with other cellulose-based, protein-based, latex-based and water-soluble polymer-based thickeners other than hydroxyethylmethylcellulose. Can be used.

  The addition amount of the thickener with respect to the self-leveling material used in the present invention can be added within a range not impairing the characteristics of the present invention, and 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 part by mass, and particularly preferably 0.05 to 0.8 parts by mass. When the amount of the thickener added to the self-leveling material is increased, the viscosity of the self-leveling material slurry may increase to cause a decrease in fluidity. Therefore, it is preferably used in the above preferred range.

  In the self-leveling material used in the present invention, the combined use of a thickener and an antifoaming agent is to suppress the separation of aggregates such as hydraulic components and fine aggregates, to suppress the generation of bubbles, and to improve the surface of the cured body. It is preferable for giving a preferable effect and improving the properties of the cured product of the self-leveling material.

<Antifoaming agent>
As the antifoaming agent to be added to the self-leveling material used in the present invention, known materials such as synthetic materials such as silicon-based, alcohol-based and polyether-based materials or plant-derived natural materials can be used.

  The amount of the antifoaming agent added to the self-leveling material used in the present invention can be added within a range not impairing the characteristics of the present invention, and preferably 0.001 to 4 parts by mass with respect to 100 parts by mass of the hydraulic component. More preferably, 0.005 to 2.5 parts by mass, more preferably 0.01 to 2 parts by mass, particularly preferably 0.02 to 1.5 parts by mass. It is preferable that the addition amount of the antifoaming agent is within the above range since a suitable antifoaming effect is observed.

In the self-leveling material used in the present invention, it is preferable to use a resin powder because it has an effect of improving resistance to the occurrence of cracks in the process in which shrinkage stress generated by drying leads to crack generation.
The resin powder is not particularly limited with respect to the production method such as the resin pulverization method, and those produced by a known production method can be used. Also, as the resin powder, an anti-blocking agent is mainly used for the resin powder. Those attached to the surface can be used.
As the resin powder, it is preferable to use a re-emulsified resin powder obtained by removing the solvent by a method such as spraying or freeze-drying an aqueous polymer dispersion.

Resin powders include vinyl acetate polymer resin, ethylene / vinyl acetate copolymer resin, acrylic ester / vinyl acetate / versaic vinyl ester copolymer resin, acrylic ester copolymer resin Re-emulsifying resin powders of styrene / acrylic acid ester copolymer resin and acrylic acid ester / methacrylic acid ester copolymer resin can be used, especially vinyl acetate / versaic acid vinyl ester copolymer resin The re-emulsified 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 5 parts by mass, more preferably 0.6 to 4.5 parts by mass, still more preferably 0.7 to 4 parts by mass, particularly preferably 100 parts by mass of the hydraulic component. Can be blended with 0.8 to 3.5 parts by mass.

<Other optional components>
In the self-leveling material used in the present invention, a shrinkage reducing agent, silicone oil, and the like can be appropriately selected and used when the effect of preventing and suppressing dry cracks is further increased.

<Preferred component constitution>
In the case of constituting a self-leveling material used in the present invention, particularly suitable component constitution is a hydraulic component composed of alumina cement, Portland cement and gypsum, fine aggregate such as calcium hydroxide fine powder, fly ash fine powder, and sand. , Fluidizing agent, inorganic component, setting retarder, resin powder, thickener and antifoaming agent.

  Furthermore, the self-leveling material prepared by kneading the self-leveling material used in the present invention and water by adjusting the blending ratio of the calcium hydroxide fine powder and the fly ash fine powder in the self-leveling material used in the present invention to a predetermined value. 2 hours after applying the leveling material slurry, the Shore hardness of the surface of the cured self-leveling material slurry is preferably 10 or more.

  The self-leveling material slurry after construction has excellent fast-curing property, and the curing progresses slowly after the start of curing, while the surface of the slurry cured body maintains an appropriate water retention, In order to enable the presser to be easily and reliably carried out, a cured body of a self-leveling material slurry prepared by kneading the self-leveling material used in the present invention and water, after applying the self-leveling material slurry, 65 It is preferable that the presser foot work can be performed within minutes to 120 minutes.

<Manufacturing method>
Mixer with a predetermined amount of hydraulic component, calcium hydroxide fine powder, fly ash fine powder, inorganic component, fine aggregate, fluidizer, inorganic component, setting retarder, resin powder, thickener and antifoaming agent By mixing with, a premix powder of the self-leveling material used in the present invention can be obtained.

  The pre-mix powder of the self-leveling material used in the present invention can be mixed and stirred with a predetermined amount of water to produce a self-leveling material slurry, and the self-leveling material slurry can be applied and cured by applying and curing the self-leveling material slurry. A cured product of the material can be obtained. In particular, by applying and curing the self-leveling material slurry on the concrete, a concrete floor structure having excellent horizontal level accuracy having a hardened body layer of the self-leveling material slurry using the self-leveling material used in the present invention on the surface layer. You can get a body.

  The self-leveling material used in the present invention can be mixed and stirred with water to produce a self-leveling material slurry. By adjusting the amount of water added, the fluidity of the self-leveling material slurry, pot life, material Separability and strength of the cured product can be adjusted. The amount of water added to the self-leveling material used in the present invention is preferably 10-36 parts by mass, more preferably 14-32 parts by mass, more preferably 18-28 parts by mass, particularly 100 parts by mass of the self-leveling material. It is preferable to add and use in the range of 22 to 26 parts by mass.

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 3 to 50 mm, more preferably in the range of 4 to 40 mm, particularly preferably in the range of 5 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 perform an operation of spreading the film. By performing the above operation, a thin self-leveling material slurry cured body layer having high horizontal level accuracy can be formed on 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. By performing the above operation, a thick self-leveling material slurry cured body layer having high horizontal level accuracy can be formed on the entire floor slab.

Next, the coating floor material used in the present invention will be described.
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 more detail based on examples. However, the present invention is not limited by the following examples.

(1) Evaluation of self-leveling material slurry:
As the self-leveling material slurry used for the evaluation, a self-leveling material slurry immediately after kneading prepared by kneading the self-leveling material and water is used.

-Self-leveling property (self-fluidity): flow value and SL value The flow value was measured according to JASS 15M-103. That is, a pipe made of vinyl chloride (internal volume 100 ml) having an inner diameter of 50 mm and a height of 51 mm was placed on a glass sheet having a thickness of only 5 mm, filled with kneaded self-leveling material slurry, and then the pipe was pulled up. After the spread of the self-leveling material slurry stopped, the diameters in two directions at right angles were measured, and the average value was taken as the flow value.

  The SL measuring device shown in FIG. 1 was used for measuring the SL value. The SL measuring instrument has a structure in which a rail having a width of 30 mm, a height of 30 mm, and a length of 750 mm and a barrier plate is provided at a length of 150 mm from the end of the rail. The self-leveling material slurry was molded by filling a predetermined amount of the self-leveling material slurry immediately after kneading between the tip of the rail and the weir plate. Immediately after molding the self-leveling material slurry, pull up the weir plate, and after the flow of the self-leveling material slurry stops, the part closest to the mark from the reference point (weir plate installation part) to the tip of the flow of the self-leveling material slurry (shortest) The distance (SL value) was set to L0. Similarly, after 5 minutes after molding, the weir plate is pulled up, and after the flow of the self-leveling material slurry is stopped, the distance from the gage (the installation portion of the weir plate) to the shortest portion of the flow of the self-leveling material slurry is measured. The value (SL value) was L5.

(2) Watering time After the prepared self-leveling material slurry was poured into a 13 cm × 19 cm resin mold at a thickness of 10 mm, the water on the surface of the self-leveling material slurry disappeared (reflection of light was lost). The time when it was clouded) was taken as the watering time. The state of the surface of the self-leveling material slurry cured body was visually evaluated.

(3) Evaluation of work clamp workability The work clamp workability using a trowel was evaluated using the above-mentioned sample for measuring the watering time. After watering the surface of the self-leveling material slurry, the time when the self-leveling material slurry hardened when the iron was pressed against the sample surface did not adhere to the iron was taken as the starting time of the pressing operation, and the subsequent workability was evaluated. If water float occurs frequently due to repeated holding of the iron, the presser foot work becomes easy and a high score is obtained. Evaluation was made into 5 grades, and 5 points were made the highest evaluation. The heel presser workability completion time was set as Shore hardness = 15 on the surface of the slurry cured body, and the time from the start of the heel presser work to the end of the heel presser work was defined as the time required for the heel presser work. In addition, the water floating by repetition of the iron press means that the mortar contains free water when the surface of the mortar cured body layer is repeatedly pressed.

(4) Shore hardness of the surface of the slurry hardened body In a predetermined elapsed time after the placement of the self-leveling material slurry, the hardness of the hardened surface is measured using a spring type hardness meter type D (manufactured by Ueshima Seisakusho). The surface hardness at arbitrary 3 to 5 locations was measured, and the average value of the readings of the spring type hardness tester was defined as the surface hardness at that time.

(5) Finished state of the surface of the cured body In the above samples, the surface finish of the part where the heel presser was not added was evaluated by visual observation at 24 hours after curing. The evaluation was a five-level evaluation, with 5 points being the highest evaluation.
(6) Measuring method of adhesion strength with coating floor material Measured in accordance with NNK-005: 2000 coating strength test method for coating floor material. A primer layer for a coating 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 cement-type coating floor material is applied thereon to provide a cured body layer. A square steel jig having an adhesion surface of 40 mm × 40 mm is bonded to five places with an adhesive on a cement-based coated floor material cured body layer after 7 days of age. After the adhesive has hardened, make a cut with a diamond cutter along the periphery of the steel jig until it reaches the hardened layer of the self-leveling material slurry, and attach the steel jig to the Kenken-type adhesion tester and gradually load it. And pressurize until it breaks. The maximum load until breaking is the maximum tensile load. The bond strength with the coating floor material is calculated according to Equation (4).

Adhesive strength with coating floor material (N / mm ² ) = T / 1600 Formula (4)
(However, T is the maximum tensile load (N).)
The average value of 5 locations is defined as the bond strength with the coating floor material, and the bond strength is evaluated.

The following were used for the raw material of an Example and a comparative example.
1) Hydraulic component-Alumina cement (Fonju, Kerneos, Blaine specific surface area 3100 cm ² / g).
Portland cement (early strong cement, manufactured by Ube Mitsubishi Cement Co., Ltd., Blaine specific surface area 4500 cm ² / g).
Gypsum: Type ^II anhydrous gypsum (Asahi Glass Co., Ltd., Blaine specific surface area 3600 cm ² / g).
2) Calcium hydroxide fine powder (manufactured by Ube Materials, Blaine specific surface area 16020 cm ² / g, average particle size = 7.0 μm, particle size distribution is shown in Table 3. The particle size is measured by the following laser. This was performed using a diffraction / scattering particle size distribution analyzer.)
General name: Laser diffraction / scattering type particle size distribution measuring instrument Manufacturer: Seishin Co., Ltd. Product name: Laser Micron Sizer Model: LMS-30
3) Fly ash (Tokiwa fly ash, manufactured by Joban Thermal Power Industry, Blaine specific surface area 3660 cm ² / g, average particle size = 14.6 μm, particle size distribution is shown in Table 3. The particle size is measured by calcium hydroxide. As in the case of fine powder, the measurement was performed using a laser diffraction / scattering particle size distribution analyzer.)
4) Fine aggregate ・ Silica sand: No. 6 silica sand.
5) Fluidizer-Fluidizer A: Polycarboxylic acid fluidizer (manufactured by Kao Corporation).
Fluidizer B: calcium lignin sulfonate fluidizer (BASF Pozzolith).
6) Inorganic component-Blast furnace slag fine powder (Reverment, manufactured by Chiba River Corporation, Blaine specific surface area 4400 cm ² / g).
7) Setting retarder-Sodium gluconate (manufactured by Tomita Pharmaceutical).
-Sodium polyphosphate (manufactured by Organo).
-Sodium tripolyphosphate (manufactured by Taiyo Chemical Industries).
8) Thickener: Hydroxypropylmethylcellulose thickener (Marporose 65MP-400, manufactured by Matsumoto Yushi Co., Ltd.).
9) Antifoaming agent: Polyether type antifoaming agent (manufactured by ADEKA).
10) Resin powder: copolymer of vinyl acetate / vinyl versatate (manufactured by Nichigo Movinyl).
11) Coating floor material A
-Primer A for coating floor material: A smooth coat primer manufactured by ABC Trading Company.
-Base coat A for coated floors: Smooth coat manufactured by ABC Trading Company.
-Top coat A for coating floor material: New Cure Coat F manufactured by ABC Trading Company.
12) Coating floor material B
-Primer B for coating floor material: manufactured by Fujimaru Chemical Co., Ltd., Infix EF.
Base coat B for coating floor material: On-crete 73R manufactured by Fujimaru Chemical Co., Ltd.
-Top coat B for coating floor material: On-crete # 58 manufactured by Fujimaru Chemical Co., Ltd.

(Usage equipment, equipment)
-Plasterer: Arrowline Kogyo Co., Ltd., Shigoki Co., Ltd .: Polisher: Linax Co., Ltd.

<Example 1, Comparative Examples 1 and 2>
The self-leveling material is obtained by kneading the hydraulic component, fine aggregate, fluidizing agent, inorganic component, setting modifier, thickener and defoaming agent (total amount: 1.5 kg) shown in Table 1 using a chemistor. Then, 390 g of water was further added and kneaded for 3 minutes to obtain a self-leveling material slurry. The preparation and curing of the self-leveling material and the self-leveling material slurry were all performed in an atmosphere of a temperature of 20 ° C. and a humidity of 65%.

  Using the self-leveling material slurry obtained by the above preparation, kneading and curing, the self-leveling property, the watering time, the wrinkle-holding property, the Shore hardness, and the finished surface of the cured body were evaluated. The results are shown in Table 2.

  As shown in Comparative Example 1, in the case where neither calcium hydroxide fine powder nor fly ash fine powder is added to the self-leveling material, the water drawing accompanying the start of condensation of the self-leveling material slurry is slow. Since the surface layer of the later self-leveling material slurry is also fragile, it has been difficult to perform the presser foot work when the cured material peels and adheres.

  In addition, as shown in Comparative Example 2, when only calcium hydroxide fine powder is added to the self-leveling material and the fly ash fine powder is not added, the self-leveling material slurry is rapidly condensed to water removal. Although the time is fast and the presser foot work can be performed early, the time during which the work piece can be pressed is as short as 30 minutes, and a practically sufficient work time cannot be secured.

  On the other hand, as shown in Example 1, when the calcium hydroxide fine powder and the fly ash fine powder are both in appropriate addition amounts, the coagulation promoting effect is high and the heel pressing work can be performed early. In addition, sufficient time (55 minutes) was secured for the work clamp work at the realization site.

[Examples 2 to 4, Reference Example 1]
(Preparation of slurry for self-leveling material)
Self-leveling material 100 parts by weight of Example 1 and 23.5 parts by weight of water were blended under conditions of room temperature 20 ° C. and relative humidity 65%, and kneaded for 3 minutes using a chemistor with a rotation speed of 650 rpm. A leveling material slurry was prepared.

(Preparation of coating floor material A)
Under conditions of room temperature of 20 ° C. and relative humidity of 65%, the powder part (1.5 kg / m 2) and liquid part (0.5 kg / m 2) of the coating floor material are blended, and a chemistor with a rotation speed of 650 rpm is used. The mixture was kneaded for 3 minutes to prepare a coated flooring material A.

(Preparation of coating floor material B)
Primer A was prepared by kneading primer A agent and B agent at a mass ratio of 2: 1 under conditions of room temperature of 20 ° C. and relative humidity of 65%. The base material of the flooring material, the curing agent, and No. 6 sand were mixed at a mass ratio of 4: 4: 1, and then kneaded for 3 minutes using a chemistor with a rotation speed of 650 rpm. Was prepared. Surface finish B was prepared by kneading the topcoat base and the curing agent in a mass ratio of 8: 1.

(Specimen adjustment method)
Under conditions of room temperature of 20 ° C. and relative humidity of 65%, a triple plate of the primer for self-leveling material (stock solution to 90 g / m ²⁾ on four 300 mm × 300 mm × 60 mm concrete flat plates specified for concrete plate for pavement JIS A5304 180 g / m ^{2 of} water) was applied.
After the primer film formation, a self-leveling material slurry was poured to 10 mm.
When the Shore hardness on the surface of the cured self-leveling material slurry reached 10 (material age 1.5 to 2 hours), the samples of Example 3 and Example 4 were subjected to the heel pressing process using a gold trowel. .
Further, the surface of the self-leveling material slurry cured body sample of Example 2 and Example 4 cured for 14 days was polished to obtain a self-leveling material slurry cured body layer with different surface treatment conditions.
In addition, the surface leveling material slurry hardened | cured body layer surface which did not perform a saddle pressing process using gold trowel, and does not perform the grinding | polishing process of the hardened | cured body surface was made into the reference example.
Non-treated surface of the cured slurry, treated with a trowel, polished, treated with a trowel, and treated with a trowel. On the upper surface of four types of samples, the flooring material A and the flooring material B Were applied to the left and right halves of the sample.
In the construction of the flooring material, after applying and drying the primer for each flooring material, the base coat of the flooring material is applied with a gold trowel so that the thickness becomes 1 mm, and the surface after the flooring material is cured The finishing material (100 g / m ² ) was applied with a short-hair roller brush and cured for 7 days.
(Test procedure)
Five square steel jigs having an attachment surface of 40 mm × 40 mm were bonded to each of five places with an epoxy adhesive on a cured body layer on which two kinds of coated flooring materials after 7 days of age were applied. After the adhesive has hardened, make a cut with a diamond cutter along the periphery of the steel jig until it reaches the hardened layer of the self-leveling material slurry, and attach the steel jig to the Kenken-type adhesion tester and gradually load it. And was pressurized until it broke.

  Table 3 shows the shore hardness of the self-leveling material slurry cured body of 1 day and 14 days of age, and the adhesion strength of the concrete structure composed of the concrete plate, the self-leveling material slurry cured body and the coated floor material cured body. Shown in

(1) In the case of the reference example in which neither of the pressering treatment nor the polishing treatment was performed on the surface of the slurry leveling material of the self-leveling material, a Shore hardness of 49 was expressed at a material age of 1 day, and a Shore at a material age of 14 days. A high hardness of 61 was obtained. Moreover, about the adhesive strength at the time of constructing a cement-type and an epoxy-type coating floor material, the high adhesive strength of 1 N / mm < ² > or more was obtained with respect to any coating floor material.
(2) When the surface of the self-leveling material is hardened with a presser foot, the Shore hardness of the material one day is improved by 24% or more compared to the case of no treatment. Was improved by nearly 20% compared to the case of no treatment.
(3) In the case of Examples 2 to 4 where the surface of the self-leveling material slurry cured body was subjected to the padding process, the polishing process, or both the padding process and the polishing process, the cement-based and epoxy-based coating floors About the adhesive strength at the time of constructing the material, the adhesive strength was improved by 54% to 74% as compared with the case of the untreated reference example.

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.

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 unevenness 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 hardened body 37: Primer layer 38 for coating floor material Cement-based coating floor material 39: Hardened body layer of cement-based coating floor material 40: Surface layer

Claims (9)

Concrete comprising a step of providing a self-leveling material slurry cured body layer on the upper surface of a concrete floor of an existing building or a new building, and a step of providing a coated floor material cured body layer on the upper surface of the self-leveling material slurry cured body layer It is a construction method of a floor structure, and the step of providing a self-leveling material slurry cured body layer includes a step of providing a primer layer for a self-leveling material on the top surface of a concrete floor of a building, and a self-leveling material on the top surface of the primer layer. Including a step of placing and curing the slurry to form a self-leveling material slurry cured body layer, and a step of pressing and / or polishing the surface of the self-leveling material slurry cured body layer. The step of providing a layer is performed on the upper surface of the self-leveling material slurry cured body layer that has been subjected to the pressing process and / or the polishing process. Concrete comprising: a step of providing a primer layer for a flooring material; and a step of providing a basecoat layer for a flooring material by applying and curing the basecoat for the flooring material on the upper surface of the primer layer for the flooring material. Construction method for floor structures. 2. The method for constructing a concrete floor structure according to claim 1, wherein the surface of the cured body layer is pressed while the Shore hardness of the surface of the self-leveling material slurry cured body layer is 1 to 15. The construction method for a concrete floor structure according to claim 1, wherein the surface of the cured body layer is polished while the Shore hardness of the surface of the cured self-leveling material layer is between 35 and 80. The cured body layer surface is pressed while the shore hardness of the self-leveling material slurry cured body layer is between 1 and 15, and the cured body is cured while the shore hardness of the slurry cured body layer is between 35 and 80. The construction method of a concrete floor structure according to claim 1, wherein the surface of the layer is polished. The construction method for a concrete floor structure according to any one of claims 1 to 4, wherein the self-leveling material contains alumina cement. The self-leveling material contains a hydraulic component made of alumina cement, Portland cement and gypsum, calcium hydroxide fine powder, and fly ash fine powder, according to any one of claims 1 to 5. Construction method of concrete floor structure. The method for constructing a concrete floor structure according to any one of claims 1 to 6, wherein the coating floor material is a resin-based coating floor material or a cement-based coating floor material. The step of providing the cured floor material layer includes a step of further applying a top coat for the coating floor material and drying it on the upper surface of the base coating layer for the coating floor material to provide a top coating layer for the coating floor material. The construction method of the concrete floor structure of any one of Claims 1-7. A painted floor finished concrete floor structure obtained by the construction method according to any one of claims 1 to 8.

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