JP4985008B2 - Levelable hydraulic compositions capable of being thinned and thinnable mortars obtained therefrom - Google Patents

Description

  The present invention is a leveling hydraulic composition that can be used mainly for floor foundation adjustment of general buildings, has high fluidity and horizontal level properties, and provides an excellent cured body surface state even when the construction thickness is thin. Further, the present invention relates to a mortar having high fluidity and horizontal level obtained by kneading a leveling hydraulic composition and water and capable of having a thin construction thickness.

  As a hydraulic composition having leveling properties, Patent Document 1 discloses a composition comprising a hydraulic component composed of alumina cement, Portland cement, gypsum, and blast furnace slag, a water reducing agent, and a thickener. Patent Document 2 includes a hydraulic component, a fine aggregate, a water reducing agent, a thickener, and the fine aggregate contains 1 to 20% by mass of fine fine aggregate having an average particle size of 1 to 100 μm. Things are disclosed.

JP 2000-302519 A JP 2006-45025 A

  The present invention has high fluidity and can be finished on a smooth floor surface with excellent horizontal level even when the construction thickness is as thin as about 5 mm, preferably even when the construction thickness is as thin as about 5 mm. Leveling hydraulic compositions and their leveling properties that can be finished on a smooth floor surface with excellent properties and can be finished on a smooth floor surface even in a construction having a mating portion with a construction thickness of about 0.2 mm It aims at providing the mortar obtained from a hydraulic composition.

The first of the present invention is a leveling hydraulic composition comprising a hydraulic component comprising alumina cement, Portland cement and gypsum, fine aggregate, a fluidizing agent and / or a thickener,
The fine aggregate is a total of the fine aggregates that pass through a 50 mesh sieve and remain on a mesh sieve selected from a 70 mesh sieve, a 100 mesh sieve, a 140 mesh sieve, and a 200 mesh sieve in 100% by mass of the fine aggregate. A leveling hydraulic composition characterized by using a fine aggregate containing 90 to 100% by mass in 100% by mass of fine aggregate.
The second of the present invention is a mortar obtained by kneading the leveling hydraulic composition of the present invention and water.

The preferable aspect of the leveling hydraulic composition of this invention is shown below. A plurality of preferred embodiments can be combined.
1) Resin powder contains 1-5 mass parts with respect to 100 mass parts of hydraulic components.
2) A fine aggregate contains 50-200 mass parts with respect to 100 mass parts of hydraulic components.
3) The hydraulic component is composed of 5 to 90% by mass of alumina cement, 5 to 90% by mass of Portland cement and 5 to 50% by mass of gypsum (the total amount of alumina cement, Portland cement and gypsum is 100% by mass). It is a hydraulic component, preferably 30 to 70% by mass of alumina cement, 15 to 45% by mass of Portland cement and 15 to 50% by mass of gypsum (the total amount of alumina cement, Portland cement and gypsum is 100% by mass). A hydraulic component consisting of
4) A hydraulic composition contains an inorganic component further, and an inorganic component contains 0-350 mass parts (except 0 mass part) with respect to 100 mass parts of hydraulic components.
5) The inorganic component contains at least one component selected from blast furnace slag powder, fly ash and limestone powder.
6) The hydraulic composition contains a component selected from a setting modifier and an antifoaming agent.
7) The leveling hydraulic composition can obtain a mortar capable of thin coating with a construction thickness of 5 mm or less, preferably a thin coating with a construction thickness of 0.2 to 5 mm. It is possible to obtain a mortar that can be constructed with a rubbed part of about 2 mm.

  The leveling hydraulic composition of the present invention can produce a leveling mortar that is excellent in horizontal level and fluidity, and can obtain excellent smoothness even in thin coating construction with a construction thickness of about 5 mm. A cured product having excellent state and excellent horizontal level can be obtained.

The leveling hydraulic composition of the present invention is a leveling hydraulic composition comprising a hydraulic component composed of alumina cement, Portland cement and gypsum, a fine aggregate, an inorganic component, a water reducing agent and / or a thickening agent. And
The fine aggregate is a fine aggregate containing 90 to 100% by mass of fine aggregate having a particle size of 75 to 300 μm in 100% by mass of fine aggregate.
The inorganic component contains at least one component selected from blast furnace slag powder, fly ash and limestone powder,
It is a leveling hydraulic composition characterized by this.

The hydraulic component includes three components composed of alumina cement, Portland cement and gypsum.
The hydraulic component is preferably composed of 5 to 90 parts by mass of alumina cement, 5 to 90 parts by mass of Portland cement and 5 to 50 parts by mass of gypsum (the total of alumina cement, Portland cement and gypsum is 100 parts by mass). composition,
More preferably, a composition comprising 15 to 80 parts by mass of alumina cement, 10 to 75 parts by mass of Portland cement and 10 to 50 parts by mass of gypsum (the total of alumina cement, Portland cement and gypsum is 100 parts by mass),
More preferably, 30 to 70 parts by mass of alumina cement, 15 to 45 parts by mass of Portland cement and 15 to 50 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, 25 to 40 parts by mass of Portland cement and 17 to 25 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 it is easy to obtain a cured product having fast curing, low shrinkage or low expansion and little volume change during curing.

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 alumina cement, a cement having a particle size that does not hinder the present invention may be used, and a commercially available one may be used. For example, it is preferable to use a cement having a particle size of about 1 μm to 90 μm as a main component.
For example, alumina cement having a particle size of about 1 μm to 90 μm is 100% by mass of alumina cement, preferably 80% by mass to 100% by mass, more preferably 90% by mass to 100% by mass, and still more preferably 95% by mass to It is preferable to use 100% by mass.

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 the Portland cement, one having a particle size that does not hinder the present invention may be used, and a commercially available one may be used. For example, a material having a particle size of about 1 μm to 45 μm is preferably used as a main component.
Portland cement having a particle size of about 1 μm to 45 μm, for example, is 100% by weight, preferably 80% to 100% by weight, more preferably 90% to 100% by weight, and even more preferably 95% to 95% by weight. It is preferable to use 100% by mass.

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.
As the gypsum, a gypsum having a particle diameter that does not hinder the present invention may be used, and a commercially available one can be used. For example, a gypsum having a particle diameter of about 1 μm to 100 μm is preferably used as a main component.
For example, gypsum having a particle diameter of about 1 μm to 100 μm is 100% by mass of gypsum, preferably 80% by mass to 100% by mass, more preferably 90% by mass to 100% by mass, and still more preferably 95% by mass to 100% by mass. % Is preferably used.

The self-flowing hydraulic composition of the present invention further comprises at least one inorganic component selected from blast furnace slag fine powder, fly ash and limestone powder, and in particular, by containing blast furnace slag fine powder, The crack resistance of the cured product due to can be improved.
In particular, at least one inorganic component selected from fine blast furnace slag powder and fly ash is preferably 70% by mass to 100% by mass, more preferably 80% by mass to 100% by mass, in addition to 100% by mass of the inorganic component. Preferably 90 mass%-100 mass% containing can improve the crack resistance of the hardening body by drying shrinkage.
In the leveling hydraulic composition, the addition amount of the inorganic component is preferably 10 to 350 parts by mass, more preferably 30 to 250 parts by mass, and still more preferably 50 to 150 parts by mass, with respect to 100 parts by mass of the hydraulic component. Particularly preferred is 70 to 130 parts by mass.
As the inorganic component, those having a particle size that does not hinder the present invention may be used, and those commercially available can be used. For example, those having a particle size of about 1 μm to 75 μm are preferably used as the main component.
The inorganic component has a particle diameter of about 1 μm to 75 μm, for example, in 100% by mass of the inorganic component, preferably 80% by mass to 100% by mass, more preferably 90% by mass to 100% by mass, and further preferably 95% by mass to It is preferable to use 100% by mass.

In the leveling hydraulic composition, the amount of blast furnace slag fine powder added is preferably 10 to 350 parts by mass, more preferably 30 to 250 parts by mass, and still more preferably 50 to 150 parts by mass with respect to 100 parts by mass of the hydraulic component. Parts, particularly preferably 70 to 130 parts by mass. If the addition amount of the blast furnace slag fine powder is too small, the drying shrinkage of the cured body increases, and if it is too large, the initial strength may be lowered.
As the blast furnace slag fine powder, one having a brain specific surface area of 3000 cm ² / g or more as defined in JIS A6206 can be used.
As the blast furnace slag fine powder, a powder having a particle size that does not hinder the present invention may be used, and a commercially available one may be used. .
The blast furnace slag fine powder has a particle size of about 1 μm to 75 μm, for example, in 100 mass% of the blast furnace slag fine powder, preferably 80 mass% to 100 mass%, more preferably 90 mass% to 100 mass%, and still more preferably. It is preferable to use 95% by mass to 100% by mass because the crack resistance of the cured body due to drying shrinkage can be increased.

  In the leveling hydraulic composition of the present invention, in order to further improve the prevention / suppression effect of dry cracks that easily occur when a mortar obtained by kneading a leveling hydraulic composition and water is applied to a thin layer, leveling water A resin powder can be mixed with the hard composition and used.

The leveling hydraulic composition of the present invention can further contain a resin powder as required. The leveling hydraulic composition of the present invention is preferably used because it can have an effect of improving the resistance to the occurrence of cracks in the process that leads to the occurrence of cracks due to the shrinkage stress generated by drying by including the resin powder. I can do it.
As a resin powder, it does not specifically limit about manufacturing methods, such as the powdering method of resin, What was manufactured with the well-known manufacturing method can be used. Moreover, as resin powder, what has adhered the antiblocking agent mainly to the surface of resin powder can be used.
As the resin powder, it is preferable to use a re-emulsification type resin powder obtained by removing the solvent and drying the aqueous polymer dispersion by a method such as spraying or freeze drying.
As the particle size of the resin powder, those having a 315 μm sieve residue of 3% or less, a 300 μm sieve residue of 3% or less, particularly a 300 μm sieve residue of 2% or less can be preferably used.
The resin powder is preferably 0.5 to 5 parts by mass, more preferably 1 to 4 parts by mass, further preferably 1 to 3 parts by mass, and particularly preferably 1.5 to 2 parts by mass with respect to 100 parts by mass of the hydraulic component. .5 parts by mass can be used.

As the resin powder, it is possible to use a powdered resin obtained from one or more kinds of components such as acrylic acid ester, styrene, butadiene, ethylene, vinyl acetate, and vinyl versatate.
The resin powder is preferably a resin powder obtained from a component containing at least one or two selected from vinyl acetate and vinyl versatate, and in particular, vinyl acetate / vinyl versatate, vinyl acetate / vinyl versatate / acrylic. A copolymer such as acid ester, vinyl acetate / vinyl versatic acid / acrylic acid ester / ethylene, vinyl acetate / ethylene, vinyl acetate / acrylic acid ester / ethylene, vinyl vinyl versatate / acrylic acid ester can be preferably used. .
In particular, as the resin powder, a resin powder obtained from one or more of components such as acrylic acid ester, styrene, vinyl acetate, and vinyl versatate can be used.

In the leveling hydraulic composition of the present invention, a fine aggregate of the following condition (1), preferably condition (2), more preferably condition (3), particularly preferably condition (4) is used as the fine aggregate. By
It has high fluidity, and even when the construction thickness is as thin as about 5 mm, preferably about 4 mm, more preferably about 3 mm, it can be finished on a smooth floor surface with excellent horizontal level properties, preferably the construction thickness is the construction thickness. Is about 5 mm, preferably about 4 mm, more preferably about 3 mm, and can be finished on a smooth floor surface with excellent horizontal level properties, and the construction thickness is about 0.5 mm, preferably about 0.4 mm. More preferably, it is possible to produce a mortar that can be finished on a smooth floor surface even in a construction having a mating portion of about 0.3 mm, particularly preferably about 0.2 mm.

・ Conditions for fine aggregate (1)
A mesh sieve that passes through a 50 mesh sieve (with a particle size of 300 μm) and passes through a 50 mesh sieve and is selected from a 70 mesh sieve, a 100 mesh sieve, a 140 mesh sieve, and a 200 mesh sieve with respect to 100% by mass of the fine aggregate. The total mass of the fine aggregate remaining in the total, preferably the total mass of the fine aggregate passing through the 50 mesh sieve and remaining in the 70 mesh sieve, 100 mesh sieve, 140 mesh sieve and 200 mesh sieve, It is preferable that it is 90 mass%-100 mass%, Preferably it is 93 mass%-100 mass%, More preferably, it is 95 mass%-100 mass%, More preferably, it is 97 mass%-100 mass%.

-Fine aggregate conditions (2)
For 100% by mass of fine aggregate,
1) Fine aggregate that passes through a 50 mesh sieve (with a particle size of 300 μm remaining), passes through a 50 mesh sieve, and remains on a mesh sieve selected from a 70 mesh sieve, a 100 mesh sieve, a 140 mesh sieve, and a 200 mesh sieve. Total mass, preferably total mass of fine aggregate passing through 50 mesh sieve and remaining on 70 mesh sieve, 100 mesh sieve, 140 mesh sieve and 200 mesh sieve is 90 mass% to 100 mass% Preferably, it is 93 mass%-100 mass%, More preferably, it is 95 mass%-100 mass%, More preferably, it is 97 mass%-100 mass%.
2) Fine aggregate that passes through a 16 mesh sieve (residue 1000 μm) and remains on an 18 mesh sieve (residue 850 μm), preferably fine bone that passes through an 18 mesh sieve (residue 850 μm) and remains on a 22 mesh sieve (residue 710 μm) Material, more preferably a fine aggregate that passes through a 22 mesh sieve (residue 710 μm) and remains in a 26 mesh sieve (residue 600 μm), more preferably passes through a 26 mesh sieve (residue 600 μm) and a 36 mesh sieve (residue 425 μm) The remaining fine aggregate, particularly preferably the fine aggregate remaining through the 36 mesh sieve (425 μm residual) and the 50 mesh sieve (300 μm residual) is 0 to 2% by mass, preferably 100% by mass of the fine aggregate. 0 to 1% by mass, more preferably not included.

-Fine aggregate conditions (3)
For 100% by mass of fine aggregate,
1) Fine aggregate that passes through a 50 mesh sieve (with a particle size of 300 μm remaining), passes through a 50 mesh sieve, and remains on a mesh sieve selected from a 70 mesh sieve, a 100 mesh sieve, a 140 mesh sieve, and a 200 mesh sieve. Total mass, preferably total mass of fine aggregate passing through 50 mesh sieve and remaining on 70 mesh sieve, 100 mesh sieve, 140 mesh sieve and 200 mesh sieve is 90 mass% to 100 mass% Preferably, it is 93 mass%-100 mass%, More preferably, it is 95 mass%-100 mass%, More preferably, it is 97 mass%-100 mass%.
2) Fine aggregate that passes through a 16 mesh sieve (residue 1000 μm) and remains on an 18 mesh sieve (residue 850 μm), preferably fine bone that passes through an 18 mesh sieve (residue 850 μm) and remains on a 22 mesh sieve (residue 710 μm) Material, more preferably a fine aggregate that passes through a 22 mesh sieve (residue 710 μm) and remains in a 26 mesh sieve (residue 600 μm), more preferably passes through a 26 mesh sieve (residue 600 μm) and a 36 mesh sieve (residue 425 μm) The remaining fine aggregate, particularly preferably the fine aggregate remaining through the 36 mesh sieve (425 μm residual) and the 50 mesh sieve (300 μm residual) is 0 to 2% by mass, preferably 100% by mass of the fine aggregate. 0 to 1% by mass, more preferably not included.
3) 0 to 10% by mass, preferably 1 to 9% by mass, more preferably 2% of fine aggregate (particle size less than 75 μm) passing through a 200 mesh sieve (particle size of 75 μm remaining) with respect to 100% by mass of fine aggregate. -8% by mass, more preferably 2-4% by mass, particularly preferably 2-3% by mass.
(However, the total of the fine aggregates of 1), 2) and 3) is 100% by mass)

-Fine aggregate conditions (4)
For 100% by mass of fine aggregate,
1) Fine aggregate that passes through a 50 mesh sieve (with a particle size of 300 μm remaining), passes through a 50 mesh sieve, and remains on a mesh sieve selected from a 70 mesh sieve, a 100 mesh sieve, a 140 mesh sieve, and a 200 mesh sieve. Total mass, preferably total mass of fine aggregate passing through 50 mesh sieve and remaining on 70 mesh sieve, 100 mesh sieve, 140 mesh sieve and 200 mesh sieve is 90 mass% to 100 mass% , Preferably 93 mass% to 100 mass%, more preferably 95 mass% to 100 mass%, still more preferably 97 mass% to 100 mass%,
And,
(A) 0 to 20% by mass, preferably 1 to 18% by mass, more preferably 2% of fine aggregate having a particle size that passes through a 50 mesh sieve (residual particle size of 300 μm) and remains on a 70 mesh sieve (residual particle size of 212 μm). ~ 15 wt%, particularly preferably 2-7 wt%,
(B) 0 to 80% by mass, preferably 10 to 70% by mass, and more preferably 30% of fine aggregate having a particle size that passes through a 70 mesh sieve (residue of 212 μm particle size) and remains on a 100 mesh sieve (residual particle size of 150 μm). -60 mass%, more preferably 40-60 mass%, particularly preferably 47-55 mass%,
(C) 0-50% by mass, preferably 5-45% by mass, more preferably 10% of fine aggregate having a particle size that passes through a 100 mesh sieve (residual particle size of 150 μm) and remains on a 140 mesh sieve (particle size of 106 μm remaining). -40 mass%, more preferably 20-38 mass%, particularly preferably 28-35 mass%,
(D) 0 to 30% by mass, preferably 1 to 25% by mass, more preferably 2% of fine aggregate having a particle size that passes through a 140 mesh sieve (residual particle size of 106 μm) and remains with a 200 mesh sieve (residual particle size of 75 μm). -20 mass%, more preferably 5-18 mass%, particularly preferably 10-15 mass%,
The total mass of the fine aggregate (a), the fine aggregate (b), the fine aggregate (c) and the fine aggregate (d) is 90% by mass or more, preferably 93% by mass or more, More preferably, it is 95 mass% or more, More preferably, it is 97 mass% or more.
2) Fine aggregate that passes through a 16 mesh sieve (residue 1000 μm) and remains on an 18 mesh sieve (residue 850 μm), preferably fine bone that passes through an 18 mesh sieve (residue 850 μm) and remains on a 22 mesh sieve (residue 710 μm) Material, more preferably a fine aggregate that passes through a 22 mesh sieve (residue 710 μm) and remains in a 26 mesh sieve (residue 600 μm), more preferably passes through a 26 mesh sieve (residue 600 μm) and a 36 mesh sieve (residue 425 μm) The remaining fine aggregate, particularly preferably the fine aggregate remaining through the 36 mesh sieve (425 μm residual) and the 50 mesh sieve (300 μm residual) is 0 to 2% by mass, preferably 100% by mass of the fine aggregate. 0 to 1% by mass, more preferably not included.
3) 0 to 10% by mass, preferably 1 to 9% by mass, more preferably 2 to 8% by mass, based on 100% by mass of fine aggregate passing through a 200 mesh sieve (particle size 75 μm residual) Preferably it is 2-4 mass%, Most preferably, it is the range of 2-3 mass%.
(However, the total of the fine aggregates of 1), 2) and 3) is 100% by mass)

  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 type of fine aggregate, silica sand, river sand, sea sand, mountain sand, crushed sand and other sands, alumina clinker, silica powder, clay mineral, waste FCC catalyst, inorganic materials such as limestone, and the like 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 / Z8801.

The leveling hydraulic composition preferably includes a fluidizing agent (a water reducing agent such as a high performance water reducing agent) that ensures suitable fluidity while suppressing material separation.
Since the expression strength of alumina cement, which is a hydraulic component, is greatly affected by the water / cement ratio, it is particularly preferable to reduce the water / hydraulic component ratio by using a fluidizing agent having a water reducing effect.
As the fluidizing agent, commercially available fluidizing agents such as formaldehyde condensate of melamine sulfonic acid, casein, casein calcium, polycarboxylic acid-based, polyether-based, and polyether polycarboxylic acid, which have a water reducing effect, are included. It can be used regardless of the type, and in particular, a commercially available fluidizing agent such as a polyether-based polycarboxylic acid is preferable.
The fluidizing agent can be added as appropriate within a range that does not impair the properties, depending on the hydraulic component used, and is preferably 0.1 to 3 parts by mass, more preferably 0, relative to 100 parts by mass of the hydraulic component. .2 to 2 parts by mass, particularly preferably 0.5 to 1.5 parts by mass can be blended. If the amount added is too small, no suitable effects (excellent fluidity and high cured product strength) will be exhibited, and if the amount added is too large, an effect commensurate with the amount added cannot be expected and it is merely uneconomical. In some cases, the viscosity is increased, and the amount of kneading water for obtaining the required fluidity increases to deteriorate the strength properties.

As the thickener, commercially available thickeners such as methylcellulose-based, protein-based, latex-based, and water-soluble polymer-based agents can be used, and those containing hydroxyethyl methylcellulose as a main component are particularly preferable.
The addition amount of the thickener can be added within a range not impairing the properties of the present invention, and is preferably 0.01 to 2 parts by mass, more preferably 100 parts by mass with respect to 100 parts by mass of the self-flowing hydraulic composition. 0.05 to 1.5 parts by mass, more preferably 0.1 to 1 part by mass, and particularly preferably 0.2 to 0.5 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.
The combined use of a thickener and an antifoaming agent has a favorable effect on suppression of separation of aggregates such as hydraulic components and fine aggregates, suppression of bubble generation, and improvement of the surface of the cured body. It is preferable for improving the properties of the cured product.

  Depending on the hydraulic component and hydraulic composition used, the setting modifier can be added as appropriate within the range that does not impair the properties, and the components, addition amount and mixing ratio of the setting retarder and setting accelerator are selected as appropriate. Thus, the pot life and fast curing of the hydraulic composition can be adjusted, and the use as a leveling mortar becomes very easy, which is preferable.

  As the setting retarder, a known setting retarder can be used. As an example of a setting retarder, an organic acid such as oxycarboxylic acid or a salt thereof, an inorganic acid such as sodium bicarbonate, sodium phosphate or boric acid or a salt thereof, each component alone or two or more components Can be used in combination.

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.

The setting retarder is based on 100 parts by mass of the hydraulic component.
Preferably it is 0.01-3 mass parts, More preferably, it is 0.05-2 mass parts, More preferably, it is 0.1-1.5 mass parts, Most preferably, it uses in the range of 0.2-1 mass part. Therefore, it is preferable because the pot life (handling time) for obtaining suitable fluidity can be secured.

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

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

The setting accelerator is based on 100 parts by mass of the hydraulic component.
Preferably it is 0.01-2 mass parts, More preferably, it is 0.02-1 mass part, More preferably, it is 0.03-0.5 mass part, Most preferably, it is the range of 0.04-0.2 mass part. It is preferable because it is possible to obtain a suitable quick hardening after securing the pot life of the hydraulic composition.

As the antifoaming agent, 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 addition amount of the antifoaming agent can be added within a range that does not impair the characteristics of the present invention, and with respect to 100 parts by mass of the hydraulic component,
Preferably it is 0.01-2 mass parts, More preferably, it is 0.02-1.5 mass parts, More preferably, it is 0.05-1 mass part, It is preferable to contain especially 0.1-0.5 mass part. The addition amount of the antifoaming agent is preferably within the above range because a suitable antifoaming effect is recognized and economical from the viewpoint of cost.

  In the case of constituting a leveling hydraulic composition, particularly suitable component constitutions are hydraulic components composed of alumina cement, Portland cement and gypsum, fine aggregates such as dredged sand, powder resin, fluidizing agent, thickener and Contains an antifoaming agent.

  A hydraulic component and an inorganic component, a fine aggregate, a powder resin, a fluidizing agent, a thickener, an antifoaming agent, and the like can be mixed in a mixer to obtain a premix powder of a leveling hydraulic composition.

  The premix powder of the leveling hydraulic composition can be mixed and stirred with a predetermined amount of water to produce a mortar having a slurry leveling property. The leveling hydraulic composition is cured by curing the mortar. A cured product of the product can be obtained.

Leveling hydraulic composition can be mixed and stirred with water to produce mortar. By adjusting the amount of water added, mortar fluidity, pot life, material separability, mortar cured body Strength etc. can be adjusted.
The amount of water added is preferably 10 to 35 parts by weight, more preferably 14 to 32 parts by weight, more preferably 18 to 30 parts by weight, and particularly preferably 22 to 28 parts by weight with respect to 100 parts by weight of the leveling hydraulic composition. It is preferable to add and use in the range of parts by mass.

  When a mortar is produced by mixing and stirring a leveling hydraulic composition and water, the amount of water added is preferably 10 to 35 parts by mass, more preferably 14 parts per 100 parts by mass of the leveling hydraulic composition. It is preferable to add to 32 parts by mass, more preferably 18 to 30 parts by mass, and particularly preferably 22 to 28 parts by mass.

  In the leveling hydraulic composition of the present invention, the mortar having leveling properties obtained by mixing with water has a flow value of preferably 190 to 270 mm, more preferably 210 to 260 mm, and particularly preferably 220 to 260 mm. It is preferable that the thickness is adjusted to 250 mm for the reason that it is easy to obtain a hardened body surface that is easy to construct and highly smooth.

  When used as a self-leveling material, the leveling hydraulic composition of the present invention can be used as a flooring material in a floor base, a factory, a warehouse, a parking lot, a gas station, a kitchen, an apartment, or the like.

The leveling hydraulic composition of the present invention has high fluidity and finishes on a smooth floor surface with excellent horizontal level even when the construction thickness is about 5 mm, preferably about 4 mm, and more preferably about 3 mm. Even when the construction thickness is as thin as about 5 mm, preferably about 4 mm, more preferably about 3 mm, it can be finished on a smooth floor surface with excellent horizontal level and the construction thickness is 0 It is possible to produce a mortar that can be finished on a smooth floor surface even in a construction having a joint portion of about 0.5 mm, preferably about 0.4 mm, more preferably about 0.3 mm, and particularly preferably about 0.2 mm. .
The mortar of the present invention is obtained by mixing and stirring the leveling hydraulic composition of the present invention and water at a predetermined ratio, has high fluidity, and has a construction thickness of about 5 mm, preferably about 4 mm, Preferably, even when it is as thin as 3 mm, it can be finished to a smooth floor surface with excellent horizontal level properties, preferably even when the construction thickness is as thin as 5 mm, preferably around 4 mm, more preferably around 3 mm. It can be finished on a smooth floor surface with excellent horizontal level properties, and a construction thickness of about 0.5 mm, preferably about 0.4 mm, more preferably about 0.3 mm, particularly preferably about 0.2 mm. It is possible to finish on a smooth floor surface even in construction that has.

  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) Mortar evaluation:
As the mortar used for the evaluation, a mortar immediately after kneading prepared by kneading a leveling hydraulic composition and water is used.
-Self-leveling property: flow value and SL value The flow value is measured according to JASS 15M-103. After filling a concrete composition in which a vinyl chloride pipe (internal volume: 100 ml) having an inner diameter of 50 mm and a height of 51 mm is placed on a glass sheet having a thickness of 5 mm and kneaded, the pipe is pulled up. After the spread has stopped, the diameters in two perpendicular directions are measured, and the average value is taken as the flow value.
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. To mold. Immediately after molding, the weir plate is pulled up, and after stopping the slurry flow, the distance from the gauge point (weir plate installation part) to the shortest part of the slurry flow is measured, and the value (SL value) is set to L0. Then, the time for 200 mm is measured, and the measurement time is defined as the SL flow rate (L0) (second / 200 mm).
Similarly, after 20 or 30 minutes after molding, the weir plate is pulled up, and after the flow of the slurry is stopped, the distance from the gauge point (the installation portion of the weir plate) to the shortest portion of the slurry flow is measured, and the value (SL value) ) Is L20 or L30.
Evaluation conditions are performed in an environment of a temperature of 20 ° C. and a humidity of 65%.

(2) Evaluation of workability: The slurry was poured at a thickness of 0.2 to 3 mm, and the workability when the surface was finished with a trowel was evaluated.
(○: very good, △: good, x: bad)

(3) Evaluation of rubbing: Slurry is poured at a construction thickness of 0.2 to 3 mm, the surface is smoothed with a trowel, and the finish (smoothness) of the rubbing (construction thickness 0.2 mm) part is visually and tactilely sensed. evaluated.
(○: Very good with no irregularities, Δ: Good with small irregularities, ×: Large irregularities with poor irregularities)

(4) Hardened body surface crack evaluation:
The crack occurrence state on the surface of the mortar hardened body was applied to a concrete base which had been dried for 1 day after applying a three-fold solution (solid concentration 15%) of an acrylic resin emulsion primer (Primer G: Ube Industries). The obtained slurry was poured and finished smoothly with a trowel at a thickness of 3 mm, and visually observed at 7 days after curing. The casting was carried out at a thickness of 3 mm and 10 mm in an area of 75 cm × 200 cm. Evaluation was as follows.
(◯: 1 crack / m ² or less, Δ: 2 to 3 / m ² generated, x: 4 / m ² or more generated)

(5) Measurement of fine aggregate particle size distribution:
200 g of fine aggregate is 18 mesh sieve (particle size 850 μm), 22 mesh sieve (particle size 710 μm), 26 mesh sieve (particle size 600 μm), 36 mesh sieve (particle size 425 μm), 50 mesh sieve (particle size 300 μm), 70 mesh sieve (particle size) 212 μm), 100 mesh sieve (150 μm), 140 mesh sieve (particle size 106 μm), and 200 mesh sieve (particle size 75 μm) were shaken with a vibration sieve machine for 20 minutes for separation. The mass ratio of the aggregate remaining in each mesh was measured.
For example, using a 200 mesh sieve (particle size 75 μm), the particle size remaining on the 200 mesh sieve (particle size 75 μm) is 75 μm or more, and the particle size passing therethrough is less than 75 μm. The same applies to other mesh screens.
(6) Measurement of particle size of alumina cement, Portland cement, gypsum and inorganic components: It was carried out according to a conventional method.

The following materials were used.
1) Hydraulic component / AC: Alumina cement (Fonju, Kerneos, Blaine specific surface area 3100 cm ² / g, particle size: 1 to 90 μm).
HC: Portland cement (Haya strong cement, manufactured by Ube Mitsubishi Cement Co., Ltd., Blaine specific surface area 4500 cm ² / g, particle size: 1 to 65 μm).
Gypsum: Type ^II anhydrous gypsum (manufactured by Central Glass Co., Ltd., Blaine specific surface area 3460 cm ² / g, particle size: 1 to 100 μm).
2) Inorganic component / blast furnace slag fine powder (Reverment, manufactured by Chiba River Corporation, Blaine specific surface area 4400 cm ² / g, particle size: 1 to 75 μm).
3) Fine aggregate / silica sand: No. 6 sand, No. 7 sand or a mixed sand thereof was used. The particle size distribution is shown in Table 2.
4) Resin powder / vinyl acetate / veova copolymer: DM201P (manufactured by Nichigo-Movinyl).
5) Fluidizer / polycarboxylic acid fluidizer (manufactured by Kao Corporation).
6) Thickener / Hydroxyethylmethylcellulose thickener (Marporose MX-30000, manufactured by Matsumoto Yushi Co., Ltd.).
7) Admixture Li carbonate: (Honjo Chemical Co., Ltd.).
-Delay agent A: Sodium bicarbonate (made by Tosoh Corporation).
Delay agent B: L-sodium tartrate (manufactured by Fuso Chemical Industries).
-Antifoaming agent: A polyether type antifoaming agent (manufactured by San Nopco).

(Examples 1-3, Comparative Examples 1 and 2)
Hands are prepared by adding 5.0 kg of water to the mixture of hydraulic components, inorganic components, fine aggregate, resin powder, fluidizing agent, thickener, antifoaming agent and setting modifier (total amount: 20 kg) shown in Table 1. The mixture was kneaded for 3 minutes with a mixer to obtain a slurry. The slurry was adjusted in an atmosphere having a temperature of 20 ° C. and a humidity of 65%, and the hydraulic composition and water were used that had been kept constant in the same atmosphere in advance.

  Table 3 shows the results of SL characteristics, workability during construction with a trowel, evaluation of the smoothness of the bonded portion, and a cured body surface crack test using the obtained mortar.

1) As shown in Comparative Examples 1 and 2, the fine aggregate has a coarse particle size, passes through a 50 mesh sieve, and remains on a 70 mesh sieve, a 100 mesh sieve, a 140 mesh sieve, and a 200 mesh sieve. When the total mass is less than 90% by weight of the total weight of the fine aggregate, the evaluation of the rubbing is bad and the surface has large unevenness.
Moreover, since the resin powder was not included, cracks occurred on the surface of the cured body.
2) As shown in Comparative Example 3, when the fine aggregate was not included, the evaluation of the rubbing was good, but the workability of the mortar was very poor.
3) In Examples 1 to 5, the total mass of fine aggregates that passed through the 50 mesh sieve and the fine aggregate remaining on the 70 mesh sieve, 100 mesh sieve, 140 mesh sieve, and 200 mesh sieve However, since it contains 90% by weight or more of the total weight of the fine aggregate, the evaluation of the alignment was good.
4) Since Examples 1 to 4 further contained a resin powder, the occurrence of cracks on the surface of the cured body was small even at a construction thickness of 3 mm.

The leveling hydraulic composition of the present invention can produce a mortar having leveling properties with excellent horizontal level and fluidity, and can provide a cured product with excellent surface condition and excellent horizontal level.
Furthermore, since the mortar using the leveling hydraulic composition of the present invention has high fluidity, excellent smoothness can be obtained even in thin coating construction with a construction thickness of 5 mm or less, construction thickness = 0.2 mm. A smooth floor surface can be finished even at a degree of friction. In addition, by adding resin powder, it is possible to improve the generation of cracks due to drying that tend to occur when the construction thickness is thin (construction thickness: 0.2 to 5 mm).

It is a schematic diagram which shows the outline of self-leveling evaluation of mortar using SL measuring device.

Claims (8)

A leveling hydraulic composition comprising a hydraulic component comprising alumina cement, Portland cement and gypsum, a fine aggregate, an inorganic component, a fluidizing agent and / or a thickener,
The fine aggregate is a total of the fine aggregates that pass through a 50 mesh sieve and remain on a mesh sieve selected from a 70 mesh sieve, a 100 mesh sieve, a 140 mesh sieve, and a 200 mesh sieve in 100% by mass of the fine aggregate. Using a fine aggregate containing 90 to 100% by mass in 100% by mass of fine aggregate,
The inorganic component contains at least one component selected from blast furnace slag powder, fly ash and limestone powder,
A leveling hydraulic composition characterized by that.   The leveling hydraulic composition according to claim 1, wherein the resin powder contains 1 to 5 parts by mass with respect to 100 parts by mass of the hydraulic component. The leveling hydraulic composition according to claim 1 or 2 , wherein the fine aggregate contains 50 to 200 parts by mass with respect to 100 parts by mass of the hydraulic component.   The hydraulic component is composed of 5 to 90% by mass of alumina cement, 5 to 90% by mass of Portland cement and 5 to 50% by mass of gypsum (the total amount of alumina cement, Portland cement and gypsum is 100% by mass). It is a component, The leveling hydraulic composition of any one of Claims 1-3 characterized by the above-mentioned.   A hydraulic component comprising 30 to 70% by mass of alumina cement, 15 to 45% by mass of Portland cement and 15 to 50% by mass of gypsum (the total amount of alumina cement, Portland cement and gypsum is 100% by mass) is included. The leveling hydraulic composition according to any one of claims 1 to 4, wherein:   The leveling hydraulic composition according to any one of claims 1 to 5, wherein the inorganic component contains 0 to 350 parts by mass (excluding 0 parts by mass) with respect to 100 parts by mass of the hydraulic component. . The leveling hydraulic composition according to any one of claims 1 to 6 , wherein the hydraulic composition contains a component selected from a setting modifier and an antifoaming agent. A mortar obtained by kneading the leveling hydraulic composition according to any one of claims 1 to 7 and water.

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