JP2009227481A - Hydraulic composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hydraulic composition capable of efficiently forming a thin mortar hardened body layer having excellent horizontal level property on a concrete floor surface and finishing the floor surface smooth even on the concrete floor surface having about 0.1 mm placing thickness and a joint part, and to provide mortar using the hydraulic composition and the mortar hardened body. <P>SOLUTION: The hydraulic composition includes a hydraulic component comprising alumina cement, Portland cement and gypsum, clay mineral material lubricating fine powder and a thickener. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention can be used mainly for floor foundation adjustment of general buildings, has high fluidity and fast curing, can be applied even when the construction thickness is thin, and can be applied particularly by rubbing. The present invention relates to a hydraulic composition capable of obtaining a body surface state.

  For a cement-based composition having high fluidity and fast curing, Patent Document 1 has good injectability, early curing, excellent transportability and storability, and labor for construction work. As a cement-based repair material capable of remarkably reducing the amount of particles having a particle size of 10 μm or less, alumina cement, Portland cement and gypsum having a particle content of 80% by weight or more, 100 parts by weight of alumina cement, 67 to 150 parts by weight of Portland cement, gypsum A cement-based repair material containing 11 to 150 parts by weight and containing a granular cement dispersant is disclosed.

Patent Document 2 and Patent Document 3 disclose a high-performance water reducing agent that is used in general civil engineering / building structures and concrete products, eliminates the viscosity of mortar or concrete, and prevents initial drying cracks before curing. For the purpose of providing cement admixtures and cement compositions based on the following: high-performance water reducing agents, bentonite, phlogopite, graphite, talc, boron nitride, zeolite, activated carbon, coal shell, diatomaceous earth, perlite, and A cement admixture comprising one or more inorganic substances selected from the group consisting of attapulgite and an inorganic alkali salt, and a cement composition comprising cement and the cement admixture are disclosed. Yes.

Patent Document 4 discloses a cement composition capable of obtaining a mortar having excellent workability such as glazing without using a serpentine mineral, and obtained by blending and hardening this cement composition and water. In order to provide a cured product, a cement composition containing cement, aggregate, wax, and thickener is disclosed, and Patent Document 5 is inexpensive and readily available, and is harmful to the human body. For the purpose of providing an admixture for plastering mortar, which has a low mortar workability improvement effect equivalent to or higher than that of asbestos and serpentinite, kaolinite, halloysite, pyrophyllite, talc, chlorite, montmorillonite, A clay containing one or more clay minerals selected from the group consisting of muskvite and vermiculite and having an average particle size of 0.3 to 30 μm And clay, plastering mortar admixtures are disclosed blended 0.3 to 10 parts by weight with respect to clay 100 parts by weight of a water-soluble polymer thickener.

JP 2002-274924 A JP-A-7-53248 Japanese Patent Laid-Open No. 7-277795 JP 2006-213593 A JP 2006-160589 A

The present invention provides a hydraulic composition capable of efficiently forming a thin mortar cured body layer having a good horizontal level on a concrete floor, a mortar using the hydraulic composition, and a mortar cured body thereof. For the purpose.
Furthermore, the present invention can efficiently form a hardened mortar layer having a good level level with a thin layer on the concrete floor surface, and even in a concrete floor having a ground portion having a construction thickness of about 0.1 mm, It aims at providing the hydraulic composition which can be finished smoothly, the mortar using the hydraulic composition, and its mortar hardening body.

  The inventors of the present invention have worked diligently on the above-mentioned problems, and have a good fluidity and excellent quick-hardness by using a hydraulic composition containing a fine powder having a specific particle size configuration. Even when the construction thickness is 5mm or less, it can be finished to a smooth floor surface with excellent horizontal level characteristics, and even in the construction of a concrete floor having a laminated portion with a construction thickness of about 0.1mm, The present invention has been completed by finding a hydraulic composition that can be finished on a smooth floor surface by using the rubbing work, a mortar using the hydraulic composition, and a cured mortar thereof.

The first of the present invention is a hydraulic composition comprising a hydraulic component made of alumina cement, Portland cement and gypsum, a clay mineral slip powder, and a thickener.
The second of the present invention is a mortar obtained by kneading the hydraulic composition of the present invention and water.
The third of the present invention is a cured product obtained by curing a mortar obtained by kneading the 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) The clay mineral matter fine powder shall be a fine powder of wax.
2) The clay mineral matter fine powder contains 80 to 99% by mass of particles having a particle diameter of more than 1 μm and 48 μm or less in the clay mineral matter fine powder (100% by mass).
3) The clay mineral matter fine powder does not include particles having a particle size of 1 μm or less and particles having a particle size of more than 96 μm in the clay mineral matter fine powder (100% by mass). 25 to 50% by mass of particles exceeding 6 μm, 5 to 40% by mass of particles exceeding 6 μm and 12 μm or less, and 5 to 40% by mass of particles exceeding 12 μm and 24 μm or less And 5 to 40% by mass of particles having a particle diameter of more than 24 μm and 48 μm or less, and 1 to 20% by mass of particles having a particle diameter of more than 48 μm and 96 μm or less.
4) The thickener is a methyl-cellulose thickener.
5) The hydraulic component (total of alumina cement, Portland cement and gypsum = 100% by mass) is a hydraulic component 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. There is.
6) The hydraulic composition contains an antifoaming agent.
7) The hydraulic composition contains a resin powder, a fluidizing agent, an inorganic component excluding clay mineral matter fine powder, a setting accelerator and a setting retarder.
8) The mortar obtained by kneading the hydraulic composition and water should be used for thin coating construction with a construction thickness of 0.1 to 5 mm.
9) The mortar obtained by kneading the hydraulic composition and water should be applied to a bonded portion having a construction thickness of 0.1 mm to 1 mm using a ridge.

Since the hydraulic composition of the present invention has good fluidity and excellent quick hardening, it can be finished on a smooth floor surface with excellent horizontal level even in thin coating construction with a construction thickness of 5 mm or less. .
Further, the hydraulic composition of the present invention is a mixture of a predetermined amount of clay mineral matter fine powder having a specific particle size constitution and excellent in lubricity, and has a grinded portion having a construction thickness of about 0.2 mm. Even in the construction of concrete floors, good lacquering workability can be obtained, and a smooth floor surface can be obtained by rubbing construction using plasterers.

  The hydraulic composition of the present invention is a hydraulic composition comprising a hydraulic component made of alumina cement, Portland cement, and gypsum, a clay mineral slipping fine powder, and a thickener.

The hydraulic composition of the present invention includes a hydraulic component made of alumina cement, Portland cement and gypsum.
The hydraulic component (total of alumina cement, Portland cement and gypsum = 100% by mass) is preferably a composition comprising 5 to 90% by mass of alumina cement, 5 to 90% by mass of Portland cement and 5 to 50% by mass of gypsum, more preferably Is composed of 15-80 mass% alumina cement, 10-75 mass% Portland cement and 10-50 mass% gypsum, more preferably 30-70 mass% alumina cement, 15-45 mass% Portland cement and 15-50 gypsum. By using a composition composed of 40% by mass, particularly preferably 40 to 50% by mass of alumina cement, 25 to 40% by mass of Portland cement, and 17 to 25% by mass of gypsum, it has good rapid hardening and low shrinkage or low expansion. This is preferred because it is easy to obtain a cured product with little volume change during curing. There.

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 hydraulic composition of the present invention comprises a hydraulic component composed of alumina cement, Portland cement and gypsum, clay mineral slipping fine powder, and a thickener.

In the present invention, it is possible to improve the fluidity and material separation resistance of the mortar, and further, it is possible to improve the mortar coating workability when the mortar is rubbed against the concrete floor using a plasterer. It is preferable to blend a predetermined amount of clay mineral matter fine powder into the hydraulic composition.
As clay mineral matter fine powder, one or more selected from fine powder of clay mineral such as kaolinite, halloysite, smectite, talc, pyrophyllite, sericite, vermiculite and sepiolite. Can be used.
In particular, fine powder of pyroxenite (pyrophyllite) has a high lubricity imparting effect when blended with a hydraulic composition. Is preferably used since the workability of the glazing when the mortar is rubbed together using a plasterer is significantly improved.

The amount of the clay mineral matter fine powder used is preferably in the range of 20 to 200 parts by mass, more preferably in the range of 30 to 100 parts by mass, more preferably 40 to 80 parts per 100 parts by mass of the hydraulic component. By making the range of parts by mass, particularly preferably in the range of 50 to 70 parts by mass, good fluidity and material separation resistance can be imparted, and further excellent glazing and laminating workability can be obtained.
When the amount of clay mineral matter fine powder used is less than the above range, necessary and sufficient material separation resistance may be difficult to obtain, and when used in excess of the above range, the flow of mortar It is preferable to use the clay mineral matter fine powder in the above-mentioned range since the property tends to decrease.

The clay mineral matter fine powder used in the present invention is a clay mineral matter fine powder having a specific particle size configuration in order to give the mortar good fluidity and material separation resistance, and excellent glazing and laminating workability. It is preferable to use a fine powder.
The clay mineral matter fine powder is in the clay mineral matter fine powder (100% by mass).
Preferably, the particle size contains 80 to 99% by mass of particles having a particle diameter exceeding 1 μm and 48 μm or less
More preferably, it contains 85 to 98% by mass of particles having a particle size of more than 1 μm and 48 μm or less, and particularly preferably 90 to 95% by mass of particles having a particle size of more than 1 μm and 48 μm or less. Property and material separation resistance, and excellent glazing and laminating workability are stably obtained.

Moreover, the clay mineral matter fine powder used in the present invention does not include particles having a particle size of 1 μm or less and particles having a particle size of more than 96 μm in the clay mineral matter fine powder (100% by mass), Particles having a particle size of more than 1 μm and not more than 6 μm are contained in an amount of 25 to 50% by mass, particles having a particle size of more than 6 μm and not more than 12 μm and containing 5 to 40% by mass, and particles having a particle size of more than 12 μm and not more than 24 μm 5 to 40% by mass, preferably 5 to 40% by mass of particles having a particle size of more than 24 μm and 48 μm or less, and 1 to 20% by mass of particles having a particle size of more than 48 μm and 96 μm or less, Does not include particles having a particle diameter of 1 μm or less and particles having a particle diameter of more than 96 μm, particles having a particle diameter of more than 1 μm and not more than 6 μm and 27 to 40% by mass, particles having a particle diameter of more than 6 μm and not more than 12 μm 30% by mass, particle size 12 8 to 30% by mass of particles having a particle diameter of more than 24 μm and less than 24 μm, 8 to 30% by mass of particles having a particle diameter of more than 24 μm and not more than 48 μm, and 2 to 15 particles having a particle diameter of more than 48 μm and not more than 96 μm It is more preferable to contain by mass, particles having a particle diameter of 1 μm or less and particles having a particle diameter of more than 96 μm are not contained, particles having a particle diameter of more than 1 μm and 6 μm or less are contained in an amount of 28 to 35% by mass, and the particle diameter is 6 μm. 10 to 25% by weight of particles having a particle diameter of more than 12 μm and 10 to 25% by weight of particles having a particle diameter of more than 12 μm and 24 μm or less, and 10 to 25% of particles having a particle diameter of more than 24 μm and 48 μm or less. It is particularly preferable to contain 5 to 10% by mass of particles having a particle diameter of more than 48 μm and 96 μm or less.
When the clay mineral matter fine powder has a particle size constitution in the above-mentioned range, it is preferable because good fluidity and material separation resistance, and excellent glazing and rubbing workability can be stably obtained.
When the range of the particle size composition of the clay mineral slip fine powder is out of the above range, for example, when the particles include particles having a particle size larger than the above range, good glazing and rubbing workability can be stably obtained. It becomes difficult to obtain good fluidity when particles having a particle diameter smaller than the above range are included. In addition, when the particle size distribution is out of the above range, it becomes difficult to stably obtain good fluidity and material separation resistance, so that the clay mineral matter fine powder has a particle size configuration in the above range. Is preferred.

The average particle size of the clay mineral matter fine powder is preferably in the range of 5 μm to 30 μm, more preferably in the range of 8 μm to 25 μm, and particularly preferably in the range of 12 μm to 18 μm. It is preferable because material separation resistance and excellent glazing and laminating workability can be stably obtained.

In the present invention, in order to have good fluidity and high material separation resistance, and to obtain good glazing workability, in particular, excellent glazing and rubbing workability, thickening with clay mineral matter fine powder It is preferable to use the agent in combination.
As the thickener, commercially available thickeners such as methylcellulose-type, modified starch-type such as starch ether and guar gum, protein-type, latex-type, and water-soluble polymer-type can be used, and hydroxyethyl-methyl-cellulose is mainly used. Those containing as a component and / or those containing hydroxypropyl-methyl-cellulose as a main component can be more suitably used because of their low viscosity, and in particular, the flowability of mortar and high material separation resistance. Since it is possible to impart excellent glazing workability while maintaining good, it is particularly preferable to use those containing hydroxypropyl-methyl-cellulose as a main component.

The addition amount of the thickener is preferably in the range of 0.005 to 2 parts by mass, more preferably in the range of 0.007 to 1 part by mass, and more preferably 0.01 to 1 part by mass with respect to 100 parts by mass of the hydraulic component. By using it in the range of 0.5 parts by mass, particularly preferably in the range of 0.015 to 0.1 parts by mass, it is preferable because high material separation resistance can be imparted while maintaining good fluidity of the mortar.
If the addition amount of the thickener exceeds the above range, the mortar viscosity may increase and the flowability may decrease, and if the amount is less than the above range, the mortar viscosity becomes insufficient and the material is separated. Is liable to occur, which is not preferable.

In the present invention, the fluidity and material separation resistance of the mortar can be improved, and the lacquering and laying workability can be improved, so that a predetermined amount of clay mineral matter lubricating fine powder is added to the hydraulic composition. And a thickener are preferably blended. Further, the defoaming agent can be imparted with the effect of suppressing the generation of bubbles, improving the surface of the cured product, and improving the properties of the cured product of the hydraulic composition. It is preferable to use in combination.

As the antifoaming agent, known materials such as silicone-based, alcohol-based, polyether-based synthetic materials, mineral oil-based materials, plant-derived natural materials, and the like can be used alone or in combination of two or more.
The addition amount of the antifoaming agent can be added within a range that does not impair the characteristics of the present invention. When one type of antifoaming agent is used, preferably 0.001 to 3 parts relative to 100 parts by mass of the hydraulic component. 0.0 part by mass, more preferably 0.005 to 2.5 parts by mass, more preferably 0.05 to 2.0 parts by mass, and particularly preferably 0.1 to 1.0 part by mass.
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 0.1 to 0.8 parts by mass.
By adding the amount of antifoaming agent within the above range, it suppresses the generation of bubbles and gives a favorable effect for improving the surface of the cured body, and also uses the combination effect of clay mineral matter fine powder and thickener. As mentioned above, it is preferable because the flowability and material separation resistance of the mortar can be further improved, and the workability of the laminating work can be further improved.

The hydraulic composition of the present invention preferably includes a hydraulic component composed of alumina cement, Portland cement and gypsum, clay mineral slipping fine powder, and a thickener, and further includes an antifoaming agent. More preferred.
It is preferable that the hydraulic composition of this invention contains at least 1 or more types of components chosen from the inorganic powder except a resin powder, a fluidizing agent, a clay mineral substance, and a setting modifier other than the said component.

The hydraulic composition of the present invention preferably uses a resin powder because it prevents dry cracks in the mortar cured body layer and increases the tensile strength of the cured body.
Since the hydraulic composition of the present invention can strictly control the blending ratio of the constituent components, it is preferable to premix the constituent components and supply them to the site. Therefore, the resin powder to be used is preferably a powdered re-emulsified resin powder.
The resin powder has an effect of improving resistance to the occurrence of cracks and an effect of densifying the hardened body structure in the process in which the shrinkage stress generated by drying leads to the occurrence of cracks.
The resin powder is not particularly limited in its production method such as a resin pulverization method, and those produced by a known production method can be used. As the resin powder, an anti-blocking agent is mainly used. What has adhered to the surface of the resin powder can be used.
As the resin powder, it is preferable to use a re-emulsified resin powder obtained by removing the solvent by a method such as spraying or freeze-drying an aqueous polymer dispersion.

Resin powder includes vinyl acetate polymer resin, ethylene / vinyl acetate copolymer resin, vinyl acetate / versaic acid vinyl ester copolymer resin, acrylate copolymer resin, styrene / acrylic. Re-emulsification type resin powders of acid ester copolymer resins and acrylic acid ester / methacrylic acid ester copolymer resins can be used, especially acrylic acid ester / vinyl acetate / versaic acid vinyl ester copolymer resin systems. 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 20 parts by mass, more preferably 1 to 15 parts by mass, further preferably 2 to 10 parts by mass, and particularly preferably 3 to 8 parts by mass with respect to 100 parts by mass of the hydraulic component. Can be used.
When the ratio of the powder resin is larger than the above range, the viscosity of the mortar obtained by adding water is increased, the workability is lowered, and the compressive strength of the cured body tends to be lowered. Moreover, when smaller than the said range, there exists a tendency for the effect which prevents the dry crack of a hardening body, and the improvement effect of tensile strength to become small.

In the hydraulic composition, a fluidizing agent (a water reducing agent such as a high performance water reducing agent) can be used in order to secure suitable fluidity while suppressing material separation.
Since the expression strength of alumina cement, which is a hydraulic component, is greatly affected by the water / cement ratio, it is particularly preferable to reduce the water / hydraulic component ratio by using a fluidizing agent having a water reducing effect.
As a fluidizing agent, commercially available fluidizing agents such as lignin-based, melamine sulfonic acid formaldehyde condensate, casein, calcium caseinate, polyether-based, polyetherpolycarboxylic acid, etc., which have a water-reducing effect, are available. Any commercially available fluidizer such as polyether-based polycarboxylic acid, such as polyether-based, can be used.

The fluidizing agent can be appropriately added in a range that does not impair the characteristics depending on the hydraulic component used, and is preferably 0.01 to 2.0 parts by mass, more preferably 100 parts by mass of the hydraulic component. Can be blended in an amount of 0.02 to 1.0 parts by mass, particularly preferably 0.05 to 0.5 parts by mass.
If the addition amount is less than the above range, a suitable effect (excellent fluidity and high cured body strength) will not be exhibited, and if the addition amount is too large, an effect commensurate with the addition amount cannot be expected and it is simply uneconomical. In addition, in some cases, the viscosity may increase, and the amount of kneading water for obtaining the required fluidity may increase to deteriorate the strength properties.
In this invention, the mortar which has favorable leveling property can be obtained by using a fluidizing agent in the said preferable range.

The hydraulic composition of the present invention 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 as inorganic powder excluding clay minerals. Is preferred. In particular, by using fine powder of blast furnace slag, the crack resistance of the cured body due to drying shrinkage can be enhanced.
In the hydraulic composition, the addition amount of the inorganic component is preferably 15 to 200 parts by mass, more preferably 20 to 150 parts by mass, further preferably 30 to 120 parts by mass, particularly preferably 100 parts by mass of the hydraulic component. Is preferably 40 to 80 parts by mass.

In the hydraulic composition, the amount of blast furnace slag fine powder added is preferably 15 to 200 parts by mass, more preferably 20 to 150 parts by mass, and still more preferably 30 to 120 parts by mass, with respect to 100 parts by mass of the hydraulic component. Most preferably, it is 40-80 mass parts.
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.

  The setting modifier can be added as appropriate within the range that does not impair the properties, depending on the hydraulic component used or the constituent component of the hydraulic composition, and the components, addition amount and mixing ratio of the setting retarder and the setting accelerator. Is suitably selected, and it is possible to adjust the pot life and quick setting / drying property of the mortar prepared by kneading the hydraulic composition and water, which is preferable because the use of the mortar becomes very easy. .

  As the setting retarder, a known setting retarder can be used. Examples of setting retarders include organic acids such as sodium sulfate, sodium bicarbonate, sodium tartrate (L-sodium tartrate, DL-sodium tartrate, sodium hydrogen tartrate, etc.), sodium malate, sodium citrates, sodium gluconate For example, sodium salts such as inorganic sodium salts and organic sodium salts, oxycarboxylic acids, and the like can be used alone or in combination of two or more.

Oxycarboxylic acids include oxycarboxylic acids and their salts.
Examples of the oxycarboxylic acid include aliphatic oxyacids such as citric acid, gluconic acid, tartaric acid, glycolic acid, lactic acid, hydroacrylic acid, α-oxybutyric acid, glyceric acid, tartronic acid, malic acid, salicylic acid, and m-oxybenzoic acid. Examples thereof include aromatic oxyacids such as acid, p-oxybenzoic acid, gallic acid, mandelic acid and tropic acid.
Examples of oxycarboxylic acid salts include alkali metal salts of oxycarboxylic acids (specifically, sodium salts, potassium salts, etc.), alkaline earth metal salts (specifically, calcium salts, barium salts, magnesium salts, etc.), etc. Can be mentioned.
In particular, sodium bicarbonate and sodium L-tartrate are preferred from the standpoints of setting delay effect, availability, and cost, and more preferably used in combination.

When one or more kinds of setting retarders are used, the amount of each setting retarder 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 0.15 to 1.0 part by mass, and particularly preferably 0.2 to 0.8 part by mass. It is preferable because the working time (handling time) can be secured stably.

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

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

  The setting accelerator is preferably 0.01 to 1 part by weight, more preferably 0.01 to 0.5 part by weight, and still more preferably 0.02 to 0.3 part, with respect to 100 parts by weight of the hydraulic component. It is preferable to use in the range of parts by mass, particularly preferably in the range of 0.02 to 0.2 parts by mass, since suitable quick hardening and quick drying can be obtained after securing the pot life of the hydraulic composition mortar.

  In the case of constituting the hydraulic composition of the present invention, a particularly suitable component constitution includes a hydraulic component composed of alumina cement, Portland cement and gypsum, clay mineral slip fine powder, and a thickener, Further, it contains an antifoaming agent, a resin powder, an inorganic powder excluding clay minerals, a fluidizing agent and a setting modifier.

  The hydraulic composition of the present invention is a mixture of hydraulic components and clay mineral slip powder, thickener, antifoaming agent, resin powder, inorganic powder excluding clay mineral, fluidizer and setting modifier. A premix powder of a hydraulic composition can be obtained by mixing using a machine.

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

Hydraulic composition can be mixed and stirred with water to produce mortar. By adjusting the amount of water added, mortar fluidity, pot life, material separation resistance, strength of mortar hardened body Etc. can be adjusted.
In the mortar using the hydraulic composition of the present invention, the mass ratio (W / C) of the hydraulic composition (C) and water (W) is preferably in the range of 0.16 to 0.30, more preferably. It is preferable to blend and knead so as to be in the range of 0.18 to 0.28, more preferably in the range of 0.20 to 0.27, and particularly preferably in the range of 0.22 to 0.26.

In the hydraulic composition of the present invention, the flow value of the mortar having leveling properties prepared by mixing with water is preferably 150 to 270 mm, more preferably 160 to 260 mm,
It is particularly preferable that the thickness is adjusted to 180 to 240 mm for the reason that it is easy to obtain a hardened body surface with high ease of construction and high level level.

The construction thickness of the mortar using the hydraulic composition of the present invention varies depending on the uneven state of the concrete floor slab surface and the inclined state of the slab surface, and can be set as appropriate for each construction site. Based on the top surface of the most convex part of the slab surface, the construction thickness is preferably in the range of 0.1 mm to 5 mm, more preferably the construction thickness is in the range of 0.15 mm to 4 mm, more preferably the construction thickness is 0.18 mm to 3 mm. In particular, it is preferable to perform casting and / or glazing with a thickness of 0.2 mm to 2 mm.
When the mortar using the hydraulic composition of the present invention is applied thinly to a height of 1 mm to 5 mm on the basis of the top surface of the most convex part of the floor slab surface, while pouring and applying the mortar, a spike roller, a dragonfly, a bowl It is preferable to perform the operation of spreading the mortar evenly using, for example, to form the mortar at a high level in a thin layer on the entire floor slab.
When the mortar using the hydraulic composition of the present invention is rubbed at a height of 0.1 mm to 1 mm on the floor slab surface, the mortar is applied and applied using a plasterer or the like. It is preferable to form a mortar greasing layer having good horizontal level properties at the rubbing location.

The mortar using the hydraulic composition of the present invention has sufficient pot life (handling time) to ensure good workability while having fast curing and quick drying properties.
The pot life of the mortar is preferably 40 minutes from the preparation of the mortar, more preferably 50 minutes, and particularly preferably 60 minutes.

The mortar using the hydraulic composition of the present invention starts curing from 1 hour to 1.9 hours from the preparation of the mortar, depending on the temperature and humidity conditions at the construction site, and with the progress of curing. The surface hardness of the cured body increases, and the water content on the surface of the cured body decreases.
The shore hardness of the cured mortar surface is preferably 50 or more after 6 hours, more preferably 50 or more after 4 hours, more preferably 50 or more after 3.5 hours, particularly preferably 50 or more after 3 hours. Yes, after completion of mortar construction, the construction of hydraulic mortar is completed by the rapid progress of curing.

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) Evaluation of mortar fluidity:
・ Measurement method of flow value:
Measured according to JASS 15M-103. A resin pipe (internal volume 100 ml) having an inner diameter of 50 mm and a height of 51 mm is placed on a 5 mm thick sheet glass, and the kneaded mortar is filled up to the upper end of the resin pipe, and then the pipe is pulled up in the vertical direction. After the spread of the mortar stops, the diameters in two directions at right angles are measured, and the average value is taken as the flow value to evaluate the fluidity of the mortar.

(2) Evaluation of mortar mortar coating:
At a room temperature of 20 ° C. and a relative humidity of 65%, a mortar is applied to a concrete plate of 300 mm × 300 mm × 60 mm specified for a concrete plate for pavement in JIS / A5304 at a thickness of about 3 to 5 mm. The three items of mortar feeding, elongation and cutting are evaluated.
In addition, after applying mortar to the surface of the concrete flat plate with a thickness of about 1 mm, a plastered portion is formed using a plasterer, and evaluation is performed on the plastering and rubbing property.
1) Evaluation of feeding (weight) 4: Very good, 3: Good, 2: No practical problem, 1: Practical problem, 0: Not practical
2) Evaluation of elongation (coating area) 4: Very good, 3: Good, 2: No practical problem, 1: Practical problem, 0: Not practical.
3) Evaluation of cutting (remaining wrinkles): 5 steps: very good, 3: good, 2: no practical problem, 1: practical problem, 0: not practical.
4) Evaluation of glazing and rubbing properties (formation of a rubbed portion) 4: 5 steps: very good, 3: good, 2: no practical problem, 1: practical problem, 0: impractical.

(3) Evaluation of surface characteristics of cured mortar:
・ Shore hardness measurement method:
At a predetermined elapsed time from the time when the mortar is poured, the hardened surface is pressed vertically to any 3 to 5 locations using a spring type hardness tester type D (manufactured by Ueshima Seisakusho). The average value of the readings of the spring type hardness tester type D gauge at that time is regarded as the Shore hardness of the time, and the surface hardness is evaluated.
-Hardened surface properties:
The surface of the cured mortar body is cured by pouring the prepared mortar into a 13 cm x 19 cm resin mold to a thickness of 5 mm, and visually confirming the presence of pulverization and bubbles at the age of 24 hours. It was evaluated by observing. Evaluation is as follows.
Evaluation conditions are performed in an environment of a temperature of 20 ° C. and a humidity of 65%.
○: None, ×: Present

(4) Evaluation of compressive strength (N / mm ² ) and bending strength (N / mm ² ) of mortar:
・ Mortar prepared in a 4 × 4 × 16 cm form shown in JIS R-5201 is filled with mold, cured in air at a temperature of 20 ° C. and a humidity of 65% for 24 hours, demolded, and further in the air And additional curing for a predetermined period (7 days, 28 days) to obtain a molded body. The molded body is measured according to the method described in JIS / R-5201.

(Materials used): The following materials were used.
1) Hydraulic composition: The hydraulic composition which mixed the following raw material with the mixture 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.
・ Clay mineral fine powder: fine powder of wax stone, average particle size = 14.8 μm, manufactured by Saitama Sangyo Co., Ltd. Table 4 shows the particle size composition.
Silica sand: No. 6 silica sand, manufactured by Tokai Sand Industries.
-Thickener A: Hydroxyethylmethylcellulose thickener, Marporose MX-30000, manufactured by Matsumoto Yushi Seiyaku Co., Ltd.
Thickener B: Hydroxypropylmethylcellulose thickener, Marporose MP-400, manufactured by Matsumoto Yushi Co., Ltd.
-Antifoam A: A polyether type antifoam, manufactured by San Nopco.
-Antifoaming agent B: A polyether type antifoaming agent, made by ADEKA.
Resin powder: vinyl acetate / versaic acid vinyl ester / acrylic acid ester copolymer, DM2071P manufactured by Nichigo Movinyl Co., Ltd.
-Fluidizer: Polycarboxylic acid fluidizer, manufactured by Kao Corporation.
-Inorganic component: Blast furnace slag fine powder, rebirth, manufactured by Chiba Rebirth, Blaine specific surface area 4400 cm ² / g.
-Setting adjuster A: Sodium bicarbonate, manufactured by Tosoh Corporation.
-Setting controller B: L-sodium tartrate, manufactured by Fuso Chemical Industries.
-Setting adjuster C: Lithium carbonate, manufactured by Honjo Chemical Co., Ltd.

(Preparation of mortar)
Under the conditions of room temperature 20 ° C. and relative humidity 65%, the hydraulic composition and water prepared at the blending ratios shown in Table 1 were used, and in Examples 1 to 3, water 24 was added to 100 parts by mass of the hydraulic composition. Each of them is blended at a ratio of parts by mass. For Reference Example 1, blended at a ratio of 22 parts by mass of water with respect to 100 parts by mass of the hydraulic composition, and kneaded for 3 minutes using a chemistor with a rotation speed of 650 rpm, to obtain a mortar. Prepared.

[Examples 1 to 3, Reference Example]
Table 2 and Table 2 show the results of preparing mortar using a hydraulic composition containing the components shown in Table 1, and measuring the fluidity, glazing workability, surface characteristics of the mortar cured body, and strength characteristics of the mortar cured body. 3 shows.

(1) The work of constructing the coated flooring material of Reference Example 1 or constructing the pasting flooring material is excellent because the mortar has excellent flow characteristics and contains 44% by mass of alumina cement in 100% by mass of the hydraulic component. A rapid hardness was obtained, and a Shore hardness of 74 was obtained 3 hours after slurry application. (If the Shore hardness is 45 or more, an operator can ride on the cured body layer)
However, since it contains 90% by mass or more of particles having a particle size of more than 150 μm, it is difficult to perform the construction using a plasterer.
(2) The hydraulic compositions of Examples 1 to 3 have good mortar fluidity, and are good in both the coating workability, feeding, elongation, and cutting, and using plasterers. The workability was excellent. The grindability is due to the use of fine powder with a particle size finer than that of fine aggregates. This is presumably due to the selection and use of clay mineral fine powders with excellent properties.
In addition, the hydraulic compositions of Examples 1 to 3 show good quick-hardness because they contain 44% by mass of alumina cement in 100% by mass of the hydraulic component as in the reference example, and the shore is 3 hours after slurry application. A hardness of 78 was obtained. When the shore hardness is 45 or more, it is possible for an operator to ride on the cured body layer and to perform the work of constructing the coated floor material or the pasted floor material, and when using the hydraulic composition of the present invention, It becomes possible to move to the next process promptly.

Claims (12)

A hydraulic composition comprising a hydraulic component made of alumina cement, Portland cement and gypsum, a clay mineral matter fine powder, and a thickener. 2. The hydraulic composition according to claim 1, wherein the clay mineral matter fine powder is a fine powder of wax. The clay mineral matter fine powder comprises 80 to 99% by mass of particles having a particle diameter of more than 1 µm and 48 µm or less in the clay mineral matter fine powder (100 mass%). Or the hydraulic composition of Claim 2. The clay mineral matter fine powder does not include particles having a particle size of 1 μm or less and particles having a particle size of more than 96 μm in the clay mineral matter fine powder (100% by mass), and the particle size exceeds 1 μm. 25 to 50% by mass of particles having a particle size of 6 μm or less, 5 to 40% by mass of particles having a particle size of more than 6 μm and 12 μm or less, 5 to 40% by mass of particles having a particle size of more than 12 μm and 24 μm or less, The particle size of 5 to 40% by mass of particles having a particle size of more than 24 μm and 48 μm or less, and 1 to 20% by mass of particles having a particle size of more than 48 μm and 96 μm or less. The hydraulic composition according to Item 1. The hydraulic composition according to any one of claims 1 to 4, wherein the thickener is a methyl-cellulose thickener. The hydraulic component (total of alumina cement, Portland cement and gypsum = 100% by mass) is a hydraulic component 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 hydraulic composition according to any one of claims 1 to 5, wherein: The hydraulic composition according to any one of claims 1 to 6, wherein the hydraulic composition contains an antifoaming agent. The hydraulic composition includes an inorganic component excluding a resin powder, a fluidizing agent, a clay mineral matter fine powder, a setting accelerator, and a setting retarder according to any one of claims 1 to 7. The hydraulic composition as described. The water according to any one of claims 1 to 8, wherein the mortar obtained by kneading the hydraulic composition and water is used for thin coating construction having a construction thickness of 0.1 to 5 mm. Hard composition. The mortar obtained by kneading the hydraulic composition and water is applied to a bonded portion having a construction thickness of 0.1 mm to 1 mm by using a scissors. The hydraulic composition as described in 2. A mortar obtained by kneading the hydraulic composition according to any one of claims 1 to 10 and water. The hardening body obtained by hardening the mortar obtained by knead | mixing the hydraulic composition and water of any one of Claims 1-10.