JP5076596B2 - Leveling material and concrete floor structure with leveling material - Google Patents

Description

The present invention relates to a leveling material to be constructed on a concrete floor surface having an outdoor horizontal surface and a gradient, such as a balcony of a building or a shared corridor, and a concrete floor structure obtained by constructing the leveling material.

The balconies and shared corridors attached to the building are exposed to the wind and rain because they are located outdoors, and in order to prevent rainwater from accumulating on the concrete floor, In particular, a gradual water gradient is formed on the concrete floor surface by constructing mortar using plasterers.

Regarding a cement-based coating agent excellent in durability such as water permeability, freeze-thaw resistance and chemical resistance, and adhesion to a base material, Patent Document 1 uses cement, fine particle inorganic powder, dispersant and emulsion polymer. Also disclosed is a hydraulic cementitious coating composition, optionally comprising fine aggregate and water.

Further, as an elastic surface material that forms a flat surface layer by flowing on a floor surface of a building, a roof surface, and a floor surface of an athletic field such as a tennis court or a volleyball court, Patent Document 2 discloses cement-based self-leveling properties. An elastic surface finishing material obtained by adding a cationic synthetic resin emulsion to a floor mortar finishing material is disclosed.

JP-A-5-65427 JP-A-62-187187

The external floors such as the corridors and balconies of apartment buildings cannot be obtained with a concrete presser, so the required accuracy of the water gradient is not obtained.Therefore, repairs are performed with plastering repair materials, etc., and waterproofing such as urethane is applied to the grooves and walls. In addition, finishing with long sheets such as vinyl chloride is increasing.
In this case, the floor repair requires skill to finely adjust the slope, but due to the aging of the plasterer and the decrease in the number of workers, mass construction in a short period of time has become difficult.
In addition, since corridors and balconies are used as work passages, it is desirable to shorten the period of prohibition of traffic, but due to delays in curing of plastering repair materials at low temperatures, entry of other contractors before curing, construction, and weathering during curing Combined with re-repair, the construction period is often long.
Against this background, in recent years, high fluidity type mortars have become widespread for the purpose of labor saving, but the current situation is that the curing speed is slow and the construction period has not been shortened.
In addition, since the construction is performed in a place exposed to sunlight or wind, there are problems such as wrinkles and traces of bubbles due to drying of the mortar surface, and cracks in the cured body.
The present invention can be constructed in an outdoor environment, can be constructed with a water gradient, has an appropriate viscosity capable of forming a smooth floor surface having a gradient, is excellent in fast-hardening and quick-drying, and has low shrinkage characteristics. And it aimed at providing the leveling material which has crack resistance and was excellent in the weather resistance.

As a result of diligent research and development on the above problems, the present inventors have achieved an appropriate slurry viscosity by using a leveling material containing a hydraulic component that is excellent in fast curing and quick drying properties and a specific resin powder. It is easy to form a water gradient, has excellent fast-curing and quick-drying properties, has low shrinkage properties, and has resistance to cracking, and has a good surface finish even when installed in an outdoor environment. The present invention has been completed by finding a leveling material that can be suitably used for the surface of a concrete floor structure having an excellent horizontal surface and a gradient.

That is, the first of the present invention is
A leveling material comprising a hydraulic component composed of alumina cement, Portland cement and gypsum, and acrylic copolymer re-emulsifying resin powder,
The acrylic copolymer re-emulsification type resin powder has an average particle size of the primary particles of the resin powder of 0.2 to 0.8 μm, and the primary particle surface of the resin powder is coated with a water-soluble protective colloid of polyvinyl alcohol. It is the leveling material characterized by having.
The second of the present invention is
It is a concrete floor structure having a gradient obtained by using the leveling material of the present invention.

Preferred embodiments of the leveling material of the present invention are shown below. A plurality of these can be combined.
1) The leveling material includes a hydraulic component and an acrylic copolymer re-emulsifying resin powder, and further includes a component selected from an inorganic powder, a fine aggregate, a setting modifier, a fluidizing agent, a thickener, and an antifoaming agent. Contain at least one or more.
2) The leveling material slurry prepared by kneading the leveling material and water is placed on a horizontal plane and an outdoor concrete floor having a gradient of more than 0/1000 and not more than 50/1000, and the surface of the slurry is finished with a finish. about.
3) The shore hardness of the surface of the cured body of the leveling material slurry is 10 or more after 5 hours after casting the slurry and finishing it.
4) The surface of the cured body of the leveling material slurry has a gradient of more than 0/1000 and 50/1000 or less.

The leveling material of the present invention is a leveling material containing a hydraulic component excellent in fast curing and quick drying and an acrylic copolymer re-emulsifying resin powder, and the leveling material slurry obtained by kneading with water can be easily It has a moderate slurry viscosity that enables the formation of a water-gradient and a smooth floor with a gradient, and it also has high hardness and quick-drying, thus realizing excellent construction efficiency. it can.
In addition, since the cured slurry of the leveling material of the present invention has low shrinkage and uses an acrylic copolymer re-emulsified resin powder that provides a cured product that is stable against climate change, it has excellent weather resistance. The concrete floor structure which has can be implement | achieved.
Furthermore, in the present invention, by selecting and using the acrylic copolymer re-emulsified resin powder, an excellent surface finish can be obtained even in the construction under outdoor conditions where the temperature and ventilation conditions are various.

  The leveling material of 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). composition,
More preferably, a composition comprising 25 to 70 parts by mass of alumina cement, 10 to 60 parts by mass of Portland cement and 10 to 40 parts by mass of gypsum (a total of alumina cement, Portland cement and gypsum is 100 parts by mass),
More preferably, 30-60 parts by mass of alumina cement, 20-50 parts by mass of Portland cement and 15-35 parts by mass of gypsum (the total of alumina cement, Portland cement and gypsum is 100 parts by mass),
Particularly preferably, a composition comprising 40 to 50 parts by mass of alumina cement, 30 to 40 parts by mass of Portland cement and 20 to 30 parts by mass of gypsum (a total of alumina cement, Portland cement and gypsum is 100 parts by mass) is used. Therefore, it is preferable because a hardened body having fast curing and quick drying properties, low shrinkage or low expansion, little volume change during curing, and easy generation of cracks can be obtained.

In the leveling material of the present invention, it is preferable to supply the constituent components by premixing them because the blending ratio of the constituent components can be strictly controlled. For this reason, a powdered re-emulsified resin powder is used for the resin powder.
The leveling material of the present invention prevents the generation of wrinkles and bubble marks due to drying of the surface of the cured body when the slurry of the leveling material is applied outdoors, or the generation of breathing water due to material separation, and the finished surface of the cured body is finished. The re-emulsified resin powder is used in order to give the effect of improving the elasticity of the cured body and preventing the occurrence of cracks.
The type and process of the resin powder production method is not particularly limited, and those produced by known production methods can be used. As the resin powder, an anti-blocking agent is mainly attached to the surface of the resin powder. Can be used.
As the resin powder, a re-emulsified resin powder obtained by removing the solvent and drying the aqueous polymer dispersion by a method such as spraying or freeze drying is used.
In the present invention, an acrylic copolymer re-emulsion type resin powder produced from a protective colloid acrylic emulsion can be suitably used as the powder resin, and in particular, an acrylate / methacrylic acid produced from a protective colloid acrylic emulsion. An ester copolymer re-emulsifying resin powder can be suitably used.
The average particle size of the primary particles (emulsion particles) of the acrylic copolymer re-emulsifying resin powder is:
Preferably it is in the range of 0.2 to 0.8 μm,
More preferably, it is the range of 0.25-0.75 micrometer,
More preferably, it is in the range of 0.3 to 0.7 μm,
Particularly preferably, by selecting and using one in the range of 0.35 to 0.65 μm,
It is preferable because good workability and excellent adhesion, durability and weather resistance obtained by forming a dense polymer film are obtained.
In the leveling material slurry using the acrylic copolymer-based re-emulsifying resin powder having an average primary particle size in the above range, the surface of the slurry is finished with a proper gradient using a plasterer or the like. In the process of carrying out the dredging work, it is possible to obtain good dredging ability and loosening performance.
When the average particle size of the primary particles of the resin powder is larger than the above range, the workability at the time of slurry application is good, but it is not preferable because the adhesiveness, durability and weather resistance of the slurry cured body are lowered. When the average particle size of the primary particles is smaller than the above range, the adhesiveness, durability and weather resistance of the slurry cured body are good, but the workability and workability are reduced due to the decrease in wrinkling and wrinkling properties during slurry construction. It is not preferable because it gets worse.

In the present invention, the particle size of the primary particles of the re-emulsifying resin powder in 100% by mass of the acrylic copolymer re-emulsifying resin powder is:
Preferably, it contains 97% by mass or more of 0.1-1 μm particles,
More preferably, containing 95% by mass or more of 0.15-0.9 μm particles,
More preferably, it contains 90% by mass or more of 0.2-0.8 μm particles,
Particularly preferably by selecting and using particles containing 0.3 to 0.7 μm of 75% by mass or more,
It is preferable because good workability and excellent adhesion, durability and weather resistance obtained by forming a dense polymer film are obtained.
When the primary particles having a particle size in the above range are included in the above range, in the leveling material slurry using the acrylic copolymer-based re-emulsifying resin powder, the slurry surface should be provided with an appropriate gradient using a plasterer or the like. In the course of carrying out the dredging work to finish the surface smoothly, it is possible to obtain good wrinkle feedability and fraying performance.
When the average particle size of the primary particles of the resin powder is larger than the above range, the workability at the time of slurry application is good, but it is not preferable because the adhesiveness, durability and weather resistance of the slurry cured body are lowered. When the average particle size of the primary particles is smaller than the above range, the adhesiveness, durability and weather resistance of the slurry cured body are good, but the workability and workability are reduced due to the decrease in wrinkling and wrinkling properties during slurry construction. It is not preferable because it gets worse.

The acrylic copolymer-based re-emulsifying resin powder used in the present invention preferably has primary particles coated with a water-soluble protective colloid of polyvinyl alcohol.
The surface of the primary particles of the re-emulsified resin powder is coated with a water-soluble protective colloid of polyvinyl alcohol, so that the state of the original emulsion quickly (1 before the resin powder is formed) in the re-emulsification process. Secondary particle state), that is, a state in which primary particles are uniformly dispersed in the leveling material slurry.

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

The acrylic copolymer-based re-emulsifying resin powder used in the present invention is used in the form of secondary particles in which primary particles are aggregated through a process such as spray drying.
The particle size of the secondary particles of the acrylic copolymer-based re-emulsifying resin powder used in the present invention is:
Preferably it is the range of 20-100 micrometers,
More preferably, it is the range of 30-90 micrometers,
More preferably, it is the range of 45-85 micrometers,
Particularly preferably, it is in the range of 50 to 80 μm.
In the process of kneading the leveling material containing the re-emulsifying resin powder with water, the secondary particles of the re-emulsifying resin powder are crushed by the fine aggregate contained in the leveling material and easily re-recycled. It is preferable to use a re-emulsification type resin powder having a secondary particle diameter in the above range because it is likely to be dispersed and the primary particles are uniformly dispersed.
If the secondary particle size of the re-emulsifying resin powder is larger than the above range, it is difficult to re-disperse during the slurrying process, and the primary particles are not easily dispersed uniformly. When it is smaller than the above range, when pre-mixing at the factory to produce a leveling material, the re-emulsification type resin powder is scattered and handling properties such as a worse working environment are deteriorated.

The re-emulsifying resin powder used in the present invention is 100 parts by weight of the hydraulic component,
Preferably 1 to 20 parts by weight,
More preferably 2 to 18 parts by mass,
More preferably, 3 to 16 parts by mass,
Particularly preferably, by blending in the range of 4 to 15 parts by mass, good workability and highly durable cured product characteristics can be obtained together.
When the blending ratio of the resin powder is larger than the above range, the viscosity of the slurry obtained by adding water to the leveling material increases, the workability and dredging workability deteriorates, and wrinkles and bubble traces are generated due to drying of the surface layer. It becomes easy to do, and there exists a tendency for the compressive strength of a hardening body to fall. In addition, when the blending ratio is smaller than the above range, the thixotropic property of the slurry tends to be lowered and it becomes difficult to stably form the inclined surface, and further, the crack suppression effect by improving the elasticity of the slurry cured body Is small, and the surface finish of the slurry cured body tends to be poor.

The leveling material of the present invention used for the construction of a concrete floor structure having an outdoor slope includes a hydraulic component composed of alumina cement, Portland cement and gypsum, and an acrylic copolymer re-emulsifying resin powder, and further includes an inorganic powder, It is preferable to contain a fine aggregate, a setting regulator, a fluidizing agent, a thickener and an antifoaming agent.

The leveling material of 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 contains blast furnace slag fine powder. Thus, the crack resistance of the cured product due to drying shrinkage can be enhanced, and the long-term strength can be enhanced at low cost.
In the leveling material, the added amount of the inorganic component is preferably 10 to 200 parts by mass, more preferably 20 to 180 parts by mass, still more preferably 30 to 150 parts by mass, and particularly preferably 40 parts per 100 parts by mass of the hydraulic component. It is preferable to set it as -120 mass parts.

In the leveling material, the addition amount of the blast furnace slag fine powder is preferably 10 to 200 parts by weight, more preferably 20 to 180 parts by weight, still more preferably 30 to 150 parts by weight, particularly preferably 100 parts by weight of the hydraulic component. Is preferably 40 to 120 parts by mass. If the amount of blast furnace slag fine powder added is too small, drying shrinkage of the cured product may be increased, and sufficient long-term strength may not be obtained, and if too much, initial strength may be reduced.
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 leveling material can further include fine aggregate as required.
The fine aggregate is preferably 30 to 500 parts by mass, more preferably 50 to 400 parts by mass, still more preferably 100 to 300 parts by mass, and particularly preferably 150 to 250 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.

As the leveling material, a fluidizing agent (water reducing agent such as a high performance water reducing agent) that secures suitable fluidity while suppressing material separation is used.
Since the expression strength of alumina cement, which is a hydraulic component, is greatly affected by the water / cement ratio, it is particularly preferable to reduce the water / hydraulic component ratio by using a fluidizing agent having a water reducing effect.
As the fluidizing agent, commercially available fluidizing agents such as formaldehyde condensate of melamine sulfonic acid, casein, calcium caseinate, polycarboxylic acid, polyether, etc., which have a water reducing effect, such as polyether polycarboxylic acid, It can be used regardless of the type, and a commercially available fluidizing agent such as polyether-based polycarboxylic acid such as polyether-based is particularly 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 amount added is too small, no suitable effects (excellent fluidity and high cured product strength) will be exhibited, and if the amount added is too large, an effect commensurate with the amount added cannot be expected and it is merely uneconomical. However, it may be difficult to form a gradient surface due to a decrease in thixotropic properties.

  The setting modifier can be added as appropriate within the range that does not impair the properties, depending on the hydraulic component used and the component of the leveling material, and the components, addition amount and mixing ratio of the setting retarder and setting accelerator are appropriately set. It is preferable that the leveling material can be selected and the pot life and quick hardening / drying property can be adjusted, and the use as the leveling material becomes very easy.

  As the setting retarder, a known setting retarder can be used. Examples of setting retarders include oxycarboxylic acids such as sodium tartrate (monosodium tartrate, disodium tartrate), sodium malate, sodium citrate, and sodium gluconate, and inorganic sodium salts such as sodium sulfate and sodium bicarbonate. Each component 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 the setting accelerator, a known component that promotes setting can be used. For example, it is preferable to use a lithium salt having a setting acceleration effect.
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.
In addition, it is particularly preferable to use a coagulation promoting component such as aluminum sulfate, potassium sulfate, sodium aluminate or the like in combination with the above lithium salt because a further promoting effect is exhibited.

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 based on 100 parts by mass of the hydraulic component.
Preferably it is 0.01-2 mass parts, More preferably, it is 0.01-1 mass part, More preferably, it is 0.02-0.5 mass part, Most preferably, it is the range of 0.02-0.3 mass part. It is preferable because it is possible to obtain suitable quick-hardness and quick-drying properties after securing the pot life of the leveling material.

Thickener contains hydroxyethyl methylcellulose, and uses other thickeners such as cellulose, excluding hydroxyethylmethylcellulose, modified starch such as starch ether, protein, latex, and water-soluble polymer. I can do it.
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 separation of aggregates such as hydraulic components and fine aggregates, suppressing generation of bubbles, and improving the surface of the cured body, and hardening the leveling material. It is preferable for improving the properties of the product.

As the antifoaming agent, known materials such as synthetic materials such as silicon-based, alcohol-based and polyether-based materials, mineral oil-based materials, and plant-derived natural materials 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, with respect to 100 parts by mass of the hydraulic component,
Preferably 0.001-3.0 parts by mass, more preferably 0.005-2.5 parts by mass, more preferably 0.01-2.0 parts by mass, especially 0.02-1.5 parts by mass. Is preferred. 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 1.0 parts by mass. The addition amount of the antifoaming agent is preferably within the above range because a suitable antifoaming effect is recognized.

  When constructing a leveling material, particularly suitable component composition is a hydraulic component made of alumina cement, Portland cement and gypsum, acrylic copolymer-based re-emulsifying resin powder, inorganic component, fine aggregate such as silica sand, fluid It contains an agent, a thickener, an antifoaming agent, and a setting modifier.

In the present invention, a hydraulic component and an acrylic copolymer-based re-emulsification type resin powder, an inorganic component, a fine aggregate, a fluidizing agent, a thickener, an antifoaming agent and a coagulation adjusting agent are mixed in a mixer and leveled. A premix powder of the material can be obtained.

  The pre-mixed powder of the leveling material can be mixed and stirred with a predetermined amount of water to produce a slurry having leveled properties of slurry, and the slurry can be cured to obtain a cured body of the leveling material. it can.

The leveling material can be mixed and stirred with water to produce a slurry. By adjusting the amount of water added, the fluidity of the slurry, pot life, material separability, strength of the cured slurry, etc. can be adjusted. can do.
The leveling material slurry used in the present invention has a mass ratio (W / S) between the leveling material (S) and water (W).
Preferably in the range of 0.14-0.34,
More preferably, it is in the range of 0.16-0.32.
More preferably, in the range of 0.18 to 0.30,
It is particularly preferable to blend and knead so as to be in the range of 0.20 to 0.28.

The leveling material used in the present invention has a flow value of a slurry having leveling properties (high fluidity / smoothness) prepared by mixing with water.
Preferably 140-230mm,
More preferably, 160-220mm,
It is particularly preferable that the thickness is adjusted to 180 to 210 mm for the reason that it is easy to obtain a surface of a cured product having high smoothness while forming an appropriate gradient.

The construction thickness of the leveling material slurry depends on the unevenness of the concrete floor surface and the slope of the concrete floor surface, and can be set appropriately for each construction site. By reference,
Preferably, the construction thickness ranges from 0.5 mm to 50 mm,
More preferably, the construction thickness ranges from 1 mm to 40 mm,
More preferably, the construction thickness ranges from 1.5 mm to 30 mm,
It is particularly preferable to perform the pouring work in the range of the construction thickness of 2 mm to 20 mm.
When the leveling material slurry is applied thinly to a height of 0.5 mm to 10 mm with reference to the top surface of the most convex part of the concrete floor surface, the slurry is poured using a spike roller, a dragonfly, a trowel, etc. while pouring the slurry. It is preferable that the slurry layer is formed into a thin layer on the concrete floor surface and is finished to have an appropriate gradient using a plasterer or the like by performing an operation of evenly spreading.
When the leveling material slurry is applied thickly to a height of 10 mm to 50 mm with reference to the top surface of the most convex part of the floor slab surface, the slurry is poured into the slurry, and the slurry is spread evenly using a dragonfly or the like. It is preferable that the thick slurry layer is formed on the entire floor slab and the surface is finished using a plasterer or a ruler so as to obtain an appropriate gradient.

The leveling material slurry used in the present invention has sufficient pot life (handling time) to ensure good workability.
The pot life of the leveling material slurry is preferably 60 minutes from the slurry preparation,
More preferably for 40 minutes,
Particularly preferred is 30 minutes.

The leveling material used in the present invention is kneaded with water to prepare a leveling material slurry,
Outdoor concrete floor with a horizontal surface,
Preferably having a slope of greater than 0/1000 and less than or equal to 50/1000,
More preferably, it has a gradient of more than 0/1000 and not more than 40/1000,
Particularly preferably, the slurry is cast on an outdoor concrete floor having a gradient of more than 0/1000 and not more than 30/1000, and the surface of the slurry is finished with a finish.

Although the leveling material slurry depends on the temperature and humidity conditions at the construction site, it begins to cure within 1 to 3 hours after the completion of the construction, and the surface hardness of the cured body increases with the progress of curing. The moisture content on the body surface decreases.
The shore hardness of the surface of the leveling material slurry is determined by casting the slurry and finishing the surface of the slurry.
Preferably 10 or more after 5 hours,
More preferably 10 or more after 4.5 hours,
More preferably 10 or more after 4 hours,
Particularly preferably, it is 10 or more after 3 hours,
After the completion of slurry construction (placement and finishing), a concrete floor structure having a gradient can be formed in a short time by rapidly proceeding with curing.

The leveling material of the present invention has excellent properties in quick-curing and quick-drying, and can quickly obtain a good cured state and a surface-dried state. The transition to the laying process becomes possible after the next day to 3 days.

The surface of the cured body of the leveling material slurry of the present invention is
Preferably having a slope of more than 0/1000 and not more than 50/1000,
More preferably, having a gradient of more than 0/1000 and 40/1000 or less,
Particularly preferable drainage can be imparted by having a gradient of more than 0/1000 and 30/1000 or less.
In the present invention, for example, having a gradient of 30/1000 means that the height of the starting point (one side) is 0 mm and the end point (opposite side) is 30 mm in a horizontal line of 1000 mm. The state which has is shown.

The expansion of the length change rate of the cured 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%. Leveling having a rate of shrinkage of preferably 0.08 to 0%, more preferably -0.06 to 0%, particularly preferably -0.05 to 0%, and having the aforementioned expansion or contraction characteristics The material is preferable because it can prevent generation of cracks in the cured body itself and can maintain a high adhesive force with the underlying concrete floor. Also, if the length change rate is out of the above range, cracks may occur due to the curing shrinkage of the hardened body of the leveling slurry, and the moisture separated from the underlying concrete floor diffuses through the cracks. In the case where a sheet finish material layer or the like is laid on the upper surface of the hardened body of the leveling slurry, it is not preferable because swelling may occur.

Finishing layers such as various resin tiles and sheet finishing materials can be appropriately selected and used on the upper surface of the cured leveling material slurry of the present invention.

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) Flowability evaluation of leveling material slurry:
・ Measurement method of flow value:
Measured according to JASS 15M-103. A plastic pipe (internal volume: 100 ml) having an inner diameter of 50 mm and a height of 51 mm was placed on a 5 mm thick glass sheet, and after the kneaded leveling material slurry was filled up to the upper end of the resin pipe, the pipe was placed vertically. Pull up. After the spread of the slurry stopped, the diameters in two directions at right angles were measured, and the average value was taken as the flow value, and the fluidity of the slurry was evaluated.
-SL value measurement method:
The SL value is measured using the SL measuring device shown in FIG. 1, and a barrier plate is provided on a rail having a width of 30 mm × a height of 30 mm × a length of 750 mm at a length of 150 mm from the tip, and a predetermined amount of slurry immediately after kneading is filled. And molded. Immediately after molding, the weir plate is pulled up, and after stopping the slurry flow, the distance from the gauge point (weir plate installation part) to the shortest part of the slurry flow is measured, and the value (SL value) is set to L0. Further, the time for 200 mm flow was measured, and the measurement time was defined as the SL flow rate (L0) (second / 200 mm).

(2) Workability evaluation of leveling material slurry:
Under outdoor conditions, a 3 × solution of a primer for a self-leveling material (300 g / m 2 of water was added to a stock solution of 150 g / m 2) was applied to the hardened concrete base in a 1 m × 0.5 m section and allowed to dry naturally. After the primer is formed, the leveling material slurry is poured to an average construction thickness of 6 mm, and then the slurry surface is molded using a plasterer so that the gradient is 10/1000 (at 1000 mm span, the minimum construction thickness). The thickness is 1 mm and the maximum construction thickness is 11 mm).
In addition, after the leveling material slurry was applied, the time until the gloss of the slurry surface disappeared (water drawing time), the surface hardness (shore hardness) of the cured slurry after the slurry application, and the surface properties of the cured product were evaluated. .
・ Gradient formation:
After the slurry was cured, the gradient of the surface of the cured slurry was measured, and it was evaluated whether the gradient (10/1000) formed using the plasterer was maintained. The evaluation index is good when the gradient X is (9.5 ≦ X ≦ 10) / 1000, acceptable when the gradient X is (9 ≦ X <9.5) / 1000, and the gradient X is (X <9). / 1000 was not allowed.
-Ironing workability:
The trowel workability was evaluated on the four levels of excellent>good>possible> impossible from the highest evaluation order, and the pass or fail was evaluated as pass.

(3) Evaluation of surface characteristics of leveling material slurry cured product:
・ Shore hardness measurement method:
After pouring the leveling material slurry, at a predetermined elapsed time, the hardened surface is pressed perpendicularly to any 6 locations using a spring type hardness tester type D type (manufactured by Ueshima Seisakusho), and the spring type hardness tester type D at that time The average hardness reading of the mold was taken as the Shore hardness at that time, and the surface hardness was evaluated.
-Hardened surface properties:
The properties of the surface of the slurry cured body were evaluated by visually observing the presence or absence of wrinkles and bubbles after 24 hours of age after curing (when the Shore hardness can be measured). The crack was evaluated on the age of 28 days. The evaluation criteria are as follows.
○: None, ×: Present

(Materials used): The following materials were used.
1) Primer for self-leveling material: U Primer G manufactured by Ube Industries, Ltd.
2) Leveling material: A leveling material in which the following raw materials were mixed at a blending ratio shown in Table 1 was used.
Alumina cement: Fondge, manufactured by Kerneos, Blaine specific surface area of 3100 cm ² / g.
Portland cement: Hayashi Cement, Ube Mitsubishi Cement Co., Blaine specific surface area 4500 cm ² / g.
Gypsum: Type ^II anhydrous gypsum, manufactured by Central Glass Co., Ltd., Blaine specific surface area of 3460 cm ² / g.
-Fine aggregate: Silica sand: No. 6 silica sand.
-Inorganic component: Blast furnace slag fine powder, rebarment, manufactured by Chiba Rebarment Co., Ltd., Blaine specific surface area of 4400 cm ² / g.
Resin A: Acrylic ester / methacrylic ester copolymer, a re-emulsified resin powder in which primary particles are coated with a water-soluble protective colloid of polyvinyl alcohol, manufactured by Nichigo Movinyl Co., Ltd., DM7000P.
Resin B: Vinyl acetate / versaic acid vinyl ester / acrylic acid ester copolymer, re-emulsified resin powder, DM2071P, manufactured by Nichigo Movinyl.
Resin C: ethylene / vinyl acetate copolymer, re-emulsified resin powder, manufactured by Asahi Kasei Chemicals Corporation, RE5044N.
Resin D: Styrene / acrylic acid ester / methacrylic acid copolymer emulsion, U Primer G, manufactured by Ube Industries, Ltd.
-Setting retarder a: sodium bicarbonate, manufactured by Tosoh Corporation.
-Setting retarder b: L-sodium tartrate, manufactured by Fuso Chemical Industries.
-Setting accelerator a: Lithium carbonate, manufactured by Honjo Chemical Co., Ltd.
-Setting accelerator b: Aluminum sulfate, manufactured by Daimei Chemical Co., Ltd.
-Setting accelerator c: Sodium aluminate, manufactured by Hokuriku Kasei 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 polyether type antifoaming agent, manufactured by San Nopco.

(Leveling material slurry preparation)
The leveling material prepared in the conditions and the mixing ratio shown in Table 1 and water are mixed at a ratio of 25 parts by weight of water to 100 parts by weight of the leveling material, and kneaded for 3 minutes using a hand mixer with a rotation speed of 1100 rpm. Thus, a leveling material slurry was prepared.

[Example 1, Comparative Examples 1 to 4]
A leveling material slurry was prepared using a leveling material containing the components shown in Table 1. Table 2 shows the measurement results of the fluidity (flow value, SL value, slurry moving speed) of the slurry.

Table 2 shows the results of evaluating the iron workability, gradient forming property, Shore hardness, and cured body surface state of the slurry.

(1) In the case of the leveling material of Comparative Example 1 in which no resin component was blended, good gradient forming property was not obtained, and cracks occurred on the surface of the cured body.
(2) In the case of Example 1 using an acrylate / methacrylate copolymer re-emulsified resin powder as the resin component, the gradient forming property and the wrinkle workability are good, and the surface of the cured product The condition was also good.
(3) Comparative Example 2 using a re-emulsified resin powder of vinyl acetate / vinyl versatate / acrylic acid ester copolymer as the resin component, and re-emulsified resin powder of ethylene / vinyl acetate copolymer In the case of Comparative Example 3 used, the iron workability was excellent, but the gradient formation was inferior to that of Example 1. Further, wrinkles were generated on the surface of the cured body, and a smooth and good finished surface could not be obtained.
(4) In the case of Comparative Example 4 using an emulsion of styrene / acrylic acid ester / methacrylic acid copolymer as the resin component, the same properties as in Example 1 were obtained for the workability, Bubbles were observed, and a smooth and good finished surface was not obtained.

It is a schematic diagram which shows the outline which evaluates the self-leveling property of a hydraulic slurry using a SL measuring device.

Claims (4)

A leveling material comprising a hydraulic component composed of alumina cement, Portland cement and gypsum, and acrylic copolymer re-emulsifying resin powder,
The acrylic copolymer re-emulsification type resin powder has an average particle size of the primary particles of the resin powder of 0.2 to 0.8 μm, and the surface of the primary particles of the resin powder is coated with a water-soluble protective colloid of polyvinyl alcohol,
1 to 20 parts by mass of acrylic copolymer re-emulsified resin powder with respect to 100 parts by mass of hydraulic component,
The hydraulic component consists of 30-60 parts by mass of alumina cement, 20-50 parts by mass of Portland cement and 15-35 parts by mass of gypsum (a total of alumina cement, Portland cement and gypsum is 100 parts by mass),
Further, the leveling material is 10 to 200 parts by mass of fine blast furnace slag powder, 30 to 500 parts by mass of fine aggregate, 0.01 to 2.0 parts by mass of a fluidizing agent, and 0 to a setting retarder for 100 parts by mass of the hydraulic component. 0.01 to 1.5 parts by weight, a setting accelerator 0.01 to 2 parts by weight, a thickener 0.001 to 2 parts by weight and an antifoaming agent 0.001 to 3 parts by weight,
The leveling material slurry prepared by kneading the leveling material and water is placed on a horizontal plane and an outdoor concrete floor having a gradient of more than 0/1000 and not more than 50/1000, and the surface of the slurry is finished with a finish.
The leveling material characterized in that the surface of the cured product of the leveling material slurry has a gradient of more than 0/1000 and not more than 50/1000. The thickener should be mainly composed of hydroxyethyl methylcellulose
The leveling material according to claim 1. 3. The leveling material according to claim 1, wherein the shore hardness of the surface of the cured product of the leveling material slurry is 10 or more after 5 hours after the slurry is cast and finished. The concrete floor structure which has the gradient which has a slurry hardened body layer using the leveling material of any one of Claims 1-3 in a surface layer.

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