JP2009215136A - Hydraulic composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hydraulic composition excellent in handlability (pot life), trowelling workability, quick hardenability-early strength development, and dimensional stability, with regard to a plastering material with which a plaster craftsman performs mortar finishing in a construction work. <P>SOLUTION: The hydraulic composition is a hydraulic composition containing a hydraulic component containing an alumina cement, a resin component, and a fine aggregate and not containing a plasticizer, wherein the flow value measured by a flow test in accordance with JASS 15M-103 is 60-150 mm as measured on a hydraulic mortar prepared by mixing and kneading the hydraulic composition and water. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

TECHNICAL FIELD The present invention relates to a hydraulic composition excellent in workability, quick curing, and dimensional stability applied to various buildings, and a concrete structure obtained by using the hydraulic composition.

The mortar coating finish on the concrete surface is used in a wide variety of places because it is easy to construct and economical. In general, the mortar coating finishing method is a method in which Portland cement and sand are used as materials to be used, and cement mortar to which an appropriate amount of water is added is applied to the concrete surface using a trowel.

As a composition used for mortar finishing, Patent Document 1 discloses a cement-based thickened mortar suitable for use in repairing mortar and concrete structures mainly by plastering method. Thick mortar containing fine aggregate made of or fine aggregate made of lightweight aggregate, Portland cement, alumina cement, alkaline earth metal sulfate, alkali metal carbonate, expansion material, thickener and water reducing agent Is disclosed.

Patent Document 2 discloses a mortar having a long working life and a small change in fluidity within the working life, so that the workability is excellent, and the mortar capable of early opening with super-hardness is 100 parts by weight of alumina cement. Portland cement 20-300 parts by weight, plaster 1
Mortars containing 0-100 parts by weight, 0.1-5 parts by weight of accelerator and 0.1-5 parts by weight of retarder are disclosed.

Patent Document 3 contains cement, calcium aluminate, gypsum, a setting modifier, and an acrylate copolymer emulsion as a quick-hardening composition used for lining such as road pavement and tunnel concrete repair. A quick-hardening cement composition is disclosed.

JP 2007-320783 A JP 2002-356363 A JP 2007-217212 A

Various labor-saving construction methods by mechanization are being developed and put into practical use at construction sites, but the process of mortar finishing still depends on plasterers. Mortar finishing work requires skill for subtle adjustments. On the other hand, plasterers who can handle it have a shortage of plasterers due to aging and a decrease in the number of workers. For this reason, there is a need for plastering materials that can be mortar-finished efficiently in a shorter construction period.
The present invention relates to a plastering material in which a plasterer performs a mortar finish in a construction work, and relates to a hydraulic composition excellent in handling properties (working time), troweling workability, quick hardening and early strength development. The purpose was to provide.

As a result of diligent research and development on the above problems, the present inventors use a hydraulic composition containing a hydraulic component excellent in fast curing and quick drying, a specific resin component, and a fine aggregate. With the proper fluidity, long handling (usable time), and good troweling workability, the curing progresses quickly after a predetermined working time has passed. The present invention was completed by finding a hydraulic composition having good strength development.

That is, the first of the present invention is a hydraulic composition that includes a hydraulic component containing alumina cement, a resin component, and a fine aggregate, and does not include a fluidizing agent, and includes a hydraulic composition and water. Is a hydraulic composition characterized by having a flow value measured by a flow test in accordance with JASS 15M-103 of 60 to 150 mm for a hydraulic mortar prepared by mixing and kneading.
The second of the present invention is
It is a concrete wall structure which has the mortar hardening body layer using the hydraulic composition of the said invention in the surface layer.

Preferred embodiments of the hydraulic composition of the present invention are shown below. A plurality of these can be combined.
1) Fine aggregate is 3 to 20% by weight of fine particles of 30 μm to less than 150 μm, 50 to 80% by weight of particles of 150 μm to less than 300 μm, and particles of 300 μm to less than 850 μm in 100% by weight of fine aggregate. 15 to 40% by mass, and no coarse particles of 850 μm or more.
2) The hydraulic component shall consist of alumina cement, Portland cement and gypsum.
3) The resin component is a re-emulsified resin powder, the primary particle size of the resin component is 0.2 to 0.8 μm, and the primary particle surface of the resin component is a water-soluble protective colloid of polyvinyl alcohol. Acrylic copolymer re-emulsified resin powder coated with.
4) The hydraulic composition should not contain lightweight aggregates.
5) The hydraulic composition further contains at least one component selected from an inorganic powder, a setting modifier (setting retarder, or setting retarder and setting accelerator), a thickener, and an antifoaming agent.
6) The shore hardness of the surface of the cured body of the hydraulic mortar prepared by kneading the hydraulic composition and water should be 20 or more after 6 hours after the hydraulic mortar is applied.
7) The rate of change in length of the cured mortar cured material prepared by kneading the hydraulic composition and water is in the range of 0 to -0.05% for the cured mortar material at the age of 7 days. It is in the range of 0 to -0.1% in 28-day mortar cured product.
8) A cured body of a hydraulic mortar prepared by kneading a hydraulic composition and water has a bending strength of 2 N / mm ² or more at a material age of 1 day and a compressive strength of a material age of 1 N at 8 N / mm. ² or more.
9) The hydraulic mortar prepared by kneading the hydraulic composition and water is to be applied to the wall surface using a cocoon.

The hydraulic composition of the present invention is a hydraulic composition containing an alumina cement that is excellent in quick hardening and quick drying, a resin component, and a fine aggregate, and is obtained by kneading with water. Hard mortars have moderate fluidity, long handling properties (pot life), good troweling workability, and curing progresses quickly after a predetermined pot life. Mortar hardened material with good early strength development and excellent dimensional stability can be obtained, improving the workability of plasterers and enabling short-term mortar construction, durability and weather resistance The mortar hardened | cured material excellent in this is provided.

The hydraulic composition of the present invention is a hydraulic composition containing a hydraulic component containing alumina cement, a resin component, and a fine aggregate, and containing no fluidizing agent.
Furthermore, the hydraulic composition of this invention can use suitably the hydraulic component which consists of an alumina cement, a Portland cement, and a gypsum as a hydraulic component.

  Several types of alumina cement having different mineral compositions are known and commercially available, but the main component is monocalcium aluminate (CA), and commercially available products can be used regardless of the type.

  Portland cement includes ordinary Portland cement, early-strength Portland cement, super-early-strength Portland cement, medium heat Portland cement, low-heat Portland cement, Portland cement such as white Portland cement, mixed cement such as blast furnace cement, fly ash cement, silica cement, etc. Can be used.

As for gypsum, each gypsum such as anhydrous gypsum, hemihydrate gypsum, and dihydrate gypsum can be used as one type or a mixture of two or more types regardless of the type.
Gypsum functions as a component that retains dimensional stability after the mortar obtained by kneading the hydraulic composition and water is cured.

In the present invention, it is preferable to use a hydraulic component made of alumina cement, Portland cement and gypsum as the hydraulic component.
When the hydraulic component is 100 parts by mass of the total mass of alumina cement, Portland cement and gypsum,
Preferably, a composition comprising 20 to 80 parts by mass of alumina cement, 5 to 70 parts by mass of Portland cement, and 5 to 45 parts by mass of gypsum,
More preferably, a composition comprising 30 to 70 parts by mass of alumina cement, 15 to 60 parts by mass of Portland cement and 10 to 40 parts by mass of gypsum,
More preferably, a composition comprising 35-60 parts by weight of alumina cement, 20-50 parts by weight of Portland cement and 15-35 parts by weight of gypsum,
Particularly preferably, by using a composition comprising 40 to 50 parts by mass of alumina cement, 25 to 40 parts by mass of Portland cement, and 17 to 27 parts by mass of gypsum, it has quick hardening and quick drying, and has low shrinkage or low expansibility. This is preferable because there is little volume change during curing, and a cured product in which cracks are suppressed is easily obtained.

The resin component used in the hydraulic composition of the present invention is not particularly limited, and can be appropriately selected from commercially available polymer emulsions and re-emulsified resin powders.
In the hydraulic composition of the present invention, it is preferable that the constituent components are premixed and supplied because the composition ratio of the constituent components can be strictly controlled. For this reason, about a resin component, a powdery re-emulsification type resin powder can be used conveniently.

The hydraulic composition of the present invention prevents the generation of wrinkles and bubble marks due to drying of the cured body surface when hydraulic mortar is applied outdoors, and the generation of bleeding water due to material separation. Re-emulsified resin powder is used to give the effect of improving the elasticity of the cured body to prevent the occurrence of cracks and the effect of improving the adhesive strength between the cured body and the substrate . By using the re-emulsified resin powder, the above effects can be obtained, and a cured mortar body having excellent durability and weather resistance can be obtained.

The type and process of the resin component production method is not particularly limited, and those produced by known production methods can be used. As the resin component, an anti-blocking agent is mainly attached to the surface of the resin component. Can be used.
As the resin component, re-emulsified resin powder obtained by removing the solvent and drying the aqueous polymer dispersion by a method such as spraying or freeze drying is used.

In the present invention, an acrylic copolymer-based re-emulsifying resin powder produced from a protective colloid acrylic emulsion can be suitably used as the resin component, and in particular, an acrylate / methacrylic acid produced from a protective colloid acrylic emulsion. An ester copolymer re-emulsifying resin powder can be suitably used.

The average particle diameter of the primary particles (emulsion particles) of the acrylic copolymer-based re-emulsifying resin powder is preferably in the range of 0.2 to 0.8 μm, more preferably 0.25 to 0.75 μm. Range, more preferably in the range of 0.3 to 0.7 μm, particularly preferably in the range of 0.35 to 0.65 μm by selecting and using good workability and dense polymer It is preferable because excellent adhesion, durability, and weather resistance obtained by forming the film can be obtained together.
In the case of hydraulic mortar using acrylic copolymer-based re-emulsifying resin powder with an average primary particle size in the above-mentioned range, when the surface of the mortar is smooth using a plasterer, etc. Elongation is obtained.
When the average particle size of the primary particles of the resin component is larger than the above range, the workability at the time of mortar construction is good, but the adhesiveness and durability / weather resistance of the mortar cured body is lowered, which is not preferable. When the average particle size of the primary particles is smaller than the above range, the adhesion, durability and weather resistance of the cured mortar are good, but the trowel feedability and trowel elongation during mortar construction are reduced and workability is reduced. Is not preferable because it deteriorates.

In the present invention, the particle size of the primary particles of the re-emulsifiable resin powder in 100% by mass of the acrylic copolymer-based re-emulsified resin powder, preferably contains 97% by mass or more of 0.1-1 μm particles, Preferably, it contains 95% by mass or more of particles of 0.15-0.9 μm, more preferably 90% by mass or more of particles of 0.2-0.8 μm, particularly preferably particles of 0.3-0.7 μm By selecting and using those containing 75% by mass or more, it is preferable because good workability and excellent adhesion, durability and weather resistance obtained by forming a dense polymer film can be obtained.
When primary particles having a particle size in the above range are included in the above range, in the hydraulic mortar using the acrylic copolymer-based re-emulsifying resin powder, when the surface of the mortar is smoothly finished using a plasterer or the like, Good trowel feedability and trowel elongation are obtained.
When the average particle size of the primary particles of the resin component is larger than the above range, the workability at the time of mortar construction is good, but the adhesiveness and durability / weather resistance of the mortar cured body is lowered, which is not preferable. When the average particle size of the primary particles is smaller than the above range, the adhesion, durability and weather resistance of the cured mortar are good, but the trowel feedability and trowel elongation during mortar construction are reduced and workability is reduced. Is not preferable because it deteriorates.

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

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

The acrylic copolymer-based re-emulsifying resin powder used in the present invention is used in the form of secondary particles in which primary particles are aggregated through a process such as spray drying.
The particle diameter of the secondary particles of the acrylic copolymer-based re-emulsifying resin powder used in the present invention is preferably in the range of 20 to 100 μm, more preferably in the range of 30 to 90 μm, and more preferably 45 to 85 μm. In the process of kneading the hydraulic composition containing the re-emulsifiable resin powder and water and kneading it into a mortar, the range of 50 to 80 μm is particularly preferable. Re-emulsification with a secondary particle size in the above range because the particles are crushed by the fine aggregate contained in the hydraulic composition and easily redispersed, and the primary particles tend to be uniformly dispersed. It is preferable to use a mold resin powder.
If the secondary particle size of the re-emulsifying resin powder is larger than the above range, it is difficult to re-disperse during the mortarization process, and the primary particles are not easily dispersed uniformly. When it becomes smaller than the above range, when premixing at a factory to produce a hydraulic composition, handling properties such as re-emulsification type resin powder scattering and working environment deteriorates, which is not preferable.

The re-emulsifying resin powder used in the present invention is preferably 1 to 20 parts by mass, more preferably 2 to 18 parts by mass, still more preferably 3 to 16 parts by mass, particularly preferably 100 parts by mass of the hydraulic component. By blending in the range of 4 to 15 parts by mass, good workability and highly durable cured product characteristics can be obtained together.
When the blending ratio of the resin powder is larger than the above range, the viscosity of the mortar obtained by adding water to the hydraulic composition is increased, workability and trowel workability are reduced, and wrinkles and bubbles due to drying of the surface layer While it becomes easy to generate | occur | produce a trace, there exists a tendency for the compressive strength of a hardening body to fall. On the other hand, when the blending ratio is smaller than the above range, the effect of suppressing cracking due to the improved elasticity of the mortar cured body tends to be small, and the surface finish of the mortar cured body tends to be poor.

In the present invention, the mortar fluidity is improved, the water retention inside the mortar is improved to improve the material separation resistance, and the water content (breathing) on the surface of the mortar is suppressed to include a certain proportion of fine particles. It is preferable to use a fine aggregate having a specific particle size configuration.
As the fine aggregate, known silica sand, river sand, sea sand, mountain sand, crushed sand and the like generally used as fine aggregate, waste FCC catalyst, quartz powder, alumina cement clinker, etc. can be preferably used. . Also, two or more types of fine aggregates having different particle size configurations can be mixed to prepare and use a fine aggregate containing a suitable proportion of fine particles. The fine aggregate that can be suitably used in the present invention is not particularly limited in its preparation method as long as the above-mentioned particle size constitution is satisfied.
The particle size of the fine aggregate is measured using several sieves having different nominal dimensions as defined in JIS Z 8801.

The fine aggregate is preferably 3 to 20% by mass of fine particles of 30 μm or more to less than 150 μm, 50 to 80% by mass of particles of 150 μm or more to less than 300 μm, and 300 μm or more to less than 850 μm in 100% by mass of the fine aggregate. Those containing 15 to 40% by mass of particles and not containing coarse particles of 850 μm or more, more preferably 3.5 to 15% by mass and fine particles of 30 to less than 150 μm in 100% by mass of fine aggregate Particles having a particle size of less than 300 μm, 52 to 78% by mass, particles having a particle size of 300 to 850 μm and 18 to 38% by mass, and not containing 850 μm or more of coarse particles, particularly preferably 30 μm or more in 100% by mass of fine aggregate 4 to 10% by weight of fine particles of less than 150 μm, 55 to 75% by weight of particles of 150 μm or more to less than 300 μm, 300 μm or more to 850 μm What contains 20 to 35% by mass of full particles and does not contain coarse particles of 850 μm or more can be preferably used from the viewpoint of mortar fluidity, material separation resistance, and suppression of water floating.
In particular, when the fine aggregate contains fine particles of 30 μm or more and less than 150 μm in an amount of less than 3% by mass, sufficient water retention of the mortar cannot be obtained, and it becomes difficult to impart sufficient material separation resistance. . Further, the effect of suppressing water floating until the mortar is cured is reduced, and the change in fluidity with time is increased, which is not preferable.

  Further, the fine aggregate used in the present invention does not contain particles having a particle size of 850 μm or more, so that good mortar flow characteristics and material separation resistance can be obtained, and smooth and excellent surface finish can be stably obtained. This is preferable.

The fine aggregate is preferably 30 to 500 parts by weight, more preferably 50 to 400 parts by weight, still more preferably 100 to 300 parts by weight, particularly preferably 210 to 270 parts by weight with respect to 100 parts by weight of the hydraulic component. It is preferable to use in.
By using the fine aggregate containing fine particles in the above range in the above preferable range with respect to 100 parts by mass of the hydraulic component, good troweling workability can be obtained, and the material separation resistance of the entire mortar is preferable. The property can be kept.

  Moreover, in this invention, it is preferable not to contain lightweight aggregates, such as a pearlite and a foam aggregate. When a lightweight aggregate such as pearlite is used, the troweling workability may be further improved, but it is not preferable because the change over time (flow loss) of hydraulic mortar tends to increase.

The hydraulic composition of the present invention includes a hydraulic component containing alumina cement, an acrylic copolymer-based re-emulsifying resin powder, and a fine aggregate, and further includes an inorganic powder, a setting modifier (a setting retarder and / or a setting retarder). Or a coagulation accelerator), a thickener and an antifoaming agent, and no fluidizing agent.
Furthermore, the hydraulic composition of the present invention includes a hydraulic component composed of alumina cement, Portland cement and gypsum, an acrylic copolymer-based re-emulsifying resin powder, and fine aggregate, and further includes an inorganic powder and a setting agent. It contains an agent (setting retarder and / or setting accelerator), thickener and antifoaming agent, and does not contain a fluidizing agent.

The hydraulic composition of the present invention preferably contains at least one inorganic component selected from blast furnace slag fine powder, fly ash, silica fume, calcium carbonate fine powder and dolomite fine powder, and in particular, blast furnace slag fine powder. By including, the crack resistance of the hardening body by drying shrinkage | contraction can be improved, and long-term intensity | strength can be improved at low cost.
In the hydraulic composition, the amount of the inorganic component added is preferably 10 to 200 parts by mass, more preferably 20 to 150 parts by mass, still more preferably 30 to 150 parts by mass, particularly preferably 100 parts by mass of the hydraulic component. Is preferably 40 to 100 parts by mass.

In the hydraulic composition, the amount of blast furnace slag fine powder added is preferably 10 to 200 parts by mass, more preferably 20 to 150 parts by mass, and still more preferably 30 to 150 parts by mass with respect to 100 parts by mass of the hydraulic component. Especially preferably, it is preferable to set it as 40-100 mass parts. If the amount of blast furnace slag fine powder added is too small, drying shrinkage of the cured product may be increased, and sufficient long-term strength may not be obtained, and if too much, initial strength may be reduced.
As the blast furnace slag fine powder, those having a brain specific surface area of 3000 cm ² / g or more as defined in JIS A 6206 can be used.

In the hydraulic composition of the present invention, a fluidizing agent (a water reducing agent such as a high performance water reducing agent) is not used. The fluidizing agent is often used because it is easy to ensure suitable fluidity while suppressing the material separation of the mortar, but the change in the troweling workability with respect to the temperature change and the change in the usable time of the mortar. In the present invention, no fluidizing agent is used.

The setting modifier can be added as appropriate within the range that does not impair the properties, depending on the hydraulic component used and the constituent components of the hydraulic composition, and the setting retarder, or the component of the setting retarder and the setting accelerator. The addition time and the mixing ratio are appropriately selected to adjust the pot life of the hydraulic composition and the quick curing / drying properties, which is preferable because it can be very easily used as the hydraulic composition.
In particular, in the present invention, it is more preferable to use only a setting retarder as a setting adjuster because moderate fast curing properties can be slowly expressed while ensuring good handling properties.

  As the setting retarder, a known setting retarder can be used. Examples of setting retarders include oxycarboxylic acids such as sodium tartrate (monosodium tartrate, disodium tartrate), sodium malate, sodium citrate, and sodium gluconate, and inorganic sodium salts such as sodium sulfate and sodium bicarbonate. Each component can be used alone or in combination of two or more components.

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

When one or more kinds of setting retarders are used, the amount of each setting retarder added is preferably 0.01 to 2.0 parts by weight, more preferably 100 parts by weight of the hydraulic component. Is preferably 0.1 to 1.8 parts by weight, more preferably 0.2 to 1.5 parts by weight, and particularly preferably 0.25 to 1.2 parts by weight. It is preferable because the working time can be secured.

As the setting accelerator, a known component that promotes setting can be used. When the setting accelerator is used in combination with the setting retarder, for example, it is preferable to use a lithium salt having a suitable setting acceleration effect.
Examples of lithium salts include inorganic lithium salts such as lithium carbonate, lithium chloride, lithium sulfate, lithium nitrate, and lithium hydroxide, and organic acid organic lithium salts such as lithium acetate, lithium tartrate, lithium malate, and lithium citrate. Lithium salts can be used. In particular, lithium carbonate is preferable from the viewpoints of the setting acceleration effect, availability, and cost.
It is more preferable to use a coagulation promoting component such as aluminum sulfate, potassium sulfate, sodium aluminate and the like in combination with the lithium salt because the coagulation promoting effect is further exhibited.
In particular, when a setting accelerator is used in combination with a setting retarder, a higher setting acceleration effect can be obtained by using a lithium salt having a suitable setting acceleration effect and aluminum sulfate in combination.

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

The setting accelerator is based on 100 parts by mass of the hydraulic component.
Preferably it is 0.01-2 mass parts, More preferably, it is 0.01-1 mass part, More preferably, it is 0.02-0.7 mass part, Most preferably, it is the range of 0.02-0.4 mass part. It is preferable because it is possible to obtain suitable quick hardening and quick drying properties after securing the pot life of the hydraulic composition.

Thickener contains hydroxyethyl methylcellulose, and uses other thickeners such as cellulose, excluding hydroxyethylmethylcellulose, modified starch such as starch ether, protein, latex, and water-soluble polymer. I can do it.
The addition amount of the thickener can be added within a range not impairing the characteristics of the present invention, and is preferably 0.001 to 2 parts by mass, more preferably 0.005 to 100 parts by mass of the hydraulic component. It is preferable to include 1.5 parts by mass, more preferably 0.01 to 1 part by mass, particularly 0.05 to 0.8 parts by mass. When the addition amount of the thickener is increased, the mortar viscosity is increased and the fluidity may be lowered. Therefore, it is preferably used in the above preferred range.

  The combined use of a thickener and an antifoaming agent has a favorable effect in suppressing 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.

As the antifoaming agent, known materials such as synthetic materials such as silicon-based, alcohol-based and polyether-based materials, mineral oil-based materials, and plant-derived natural materials can be used alone or in combination of two or more.
The addition amount of the antifoaming agent can be added within a range that does not impair the characteristics of the present invention. When one type of antifoaming agent is used, with respect to 100 parts by mass of the hydraulic component,
Preferably 0.001-3.0 parts by mass, more preferably 0.005-2.5 parts by mass, more preferably 0.01-2.0 parts by mass, especially 0.02-1.5 parts by mass. Is preferred. The addition amount of the antifoaming agent is preferably within the above range because a suitable antifoaming effect is recognized.
In addition, when two or more kinds of antifoaming agents are used in combination, the addition amount of the antifoaming agent is preferably 0.001 to 2 parts by mass with respect to 100 parts by mass of the hydraulic component. More preferably, it is 0.005 to 1.5 parts by mass, more preferably 0.01 to 1.3 parts by mass, and particularly preferably 0.02 to 1.0 parts by mass. The addition amount of the antifoaming agent is preferably within the above range because a suitable antifoaming effect is recognized.

  In the case of constituting a hydraulic composition, particularly preferred component constitutions are a hydraulic component comprising alumina cement, Portland cement and gypsum, an acrylic copolymer-based re-emulsifying resin powder, and a fine aggregate having a specific particle size constitution. , An inorganic component, a thickener, an antifoaming agent, and a setting modifier (setting retarder, or set retarder and set accelerator).

In the present invention, a hydraulic component, an acrylic copolymer-based re-emulsifying resin powder, a fine aggregate, an inorganic component, a thickener, a defoaming agent, and a setting modifier (a setting retarder or a setting retarder and a set accelerator) Agent) and the like can be mixed with a mixer to obtain a premix powder of the hydraulic composition.

  The premix powder of the hydraulic composition can be mixed and stirred with a predetermined amount of water to produce a hydraulic mortar, and the mortar can be cured to obtain a cured body of the hydraulic composition. .

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, strength of mortar cured body, etc. Can be adjusted.
The hydraulic mortar used in the present invention has a mass ratio (W / S) between the hydraulic composition (S) and water (W).
Preferably in the range of 0.08 to 0.30,
More preferably in the range of 0.10 to 0.25,
More preferably, in the range of 0.12 to 0.20,
It is particularly preferable to blend and knead so as to be in the range of 0.14 to 0.18.

The hydraulic composition used in the present invention has a zero stroke flow value of JIS R 5201 (flow test of physical test method of cement) for hydraulic mortar prepared by mixing with water.
Preferably 90-160mm,
More preferably 105 to 155 mm,
It is particularly preferable that the thickness is adjusted to 120 to 140 mm because the ease of construction and proper troweling workability can be obtained, and the surface of the cured body having high smoothness can be easily obtained.

The hydraulic composition used in the present invention has a 15-stroke flow value of JIS R 5201 (flow test of a physical test method for cement) of a hydraulic mortar immediately after kneading prepared by mixing with water.
Preferably 160-210 mm,
More preferably 170-200 mm,
It is particularly preferable that the thickness is adjusted to 180 to 190 mm because the ease of construction and proper troweling workability can be obtained, and the surface of the cured body having high smoothness can be easily obtained.

Furthermore, the hydraulic composition used in the present invention has a flow rate of 15 strokes of JIS R 5201 (flow test of physical test method for cement) of hydraulic mortar that has been prepared by mixing with water after 60 minutes.
Preferably 160-210 mm,
More preferably 170-200 mm,
Particularly preferably, it is adjusted to 180 to 190 mm, has a long working life stably, has high tolerance for construction work, obtains proper troweling workability, and has high smoothness. It is preferable because it is easy to obtain the body surface.

The hydraulic composition used in the present invention has a flow value measured by a flow test of a self-leveling material in accordance with JASS 15M-103 for a hydraulic mortar prepared by mixing with water.
Preferably 60 to 150 mm,
More preferably 65 to 120 mm,
It is particularly preferable that the thickness is adjusted to 70 to 100 mm because the ease of construction and proper troweling workability can be obtained, and a mortar construction body without sagging can be easily obtained. When the flow value exceeds 150 mm, it is not preferable because sagging may occur in the mortar construction body when a hydraulic mortar is applied to the wall surface.

The construction thickness of hydraulic mortar varies depending on the unevenness of the concrete foundation surface, etc., and can be set appropriately for each construction site, based on the most convex top surface of the concrete surface,
Preferably the construction thickness is in the range of 0.8mm to 40mm,
More preferably, the construction thickness ranges from 1 mm to 30 mm,
More preferably, the construction thickness ranges from 1.2 mm to 15 mm,
It is particularly preferable to apply a trowel with a construction thickness of 1.5 mm to 7 mm.
In particular, the hydraulic composition of the present invention can stably obtain the most suitable workability by applying the varnishing within a preferable range of the construction thickness.

The hydraulic mortar used in the present invention has sufficient pot life (handling time) to ensure good workability.
The pot life of hydraulic mortar is preferably 60 minutes from mortar preparation,
More preferably 90 minutes,
Particularly preferred is 120 minutes.

Although hydraulic mortar depends on the temperature and humidity conditions at the construction site, it begins to cure within 2 to 3 hours after the completion of construction, and as the curing progresses, the surface hardness of the cured body increases and cures. The moisture content on the body surface decreases.
The shore hardness of the surface of the hardened mortar is determined by casting the mortar and finishing the surface of the mortar.
Preferably 20 or more after 6 hours,
More preferably 25 or more after 6 hours,
More preferably 28 or more after 6 hours,
Particularly preferably, it has a Shore hardness of 10 or more after 4 hours,
After the mortar construction (placement / trowel finishing) is completed, the concrete structure having the mortar cured body layer of the present invention can be formed in a short time by rapidly proceeding with the curing.

Flexural strength of hydraulic mortar cured body, in the mortar cured body age of 1 day, preferably from 2N / mm ² or more, more preferably 2.5 N / mm ² or more, and particularly preferably 2.8 N / mm ² or more In a mortar hardened body with a material age of 28 days, it preferably exhibits a bending strength of 5 N / mm ² or more, more preferably 6 N / mm ² or more, and particularly preferably 7 N / mm ² or more. .
Further, the compressive strength of the cured mortar body is preferably 8 N / mm ² or more, more preferably 9 N / mm ² or more, and particularly preferably 10 N / mm ² or more in the case of a mortar cured material of one day of age. expressing the strength, and the mortar cured body of the age of 28 days, preferably 20 N / mm ² or more, more preferably 24N / mm ² or more, particularly preferably express 28N / mm ² or more compression strength.

The hydraulic composition of the present invention has characteristics excellent in quick hardening and quick drying, can quickly obtain a good cured state and a surface dry state, and the transition to the next step is from the next day to the third day. It will be possible later.

The rate of change in the length of the cured hydraulic mortar is preferably 0 to -0.05%, more preferably 0 to -0.03%, and particularly preferably 0 to -0, for a mortar cured product of age 7 days. 0.025% range, and a hardened mortar with a material age of 28 days, preferably 0 to -0.1%, more preferably 0 to -0.08%, particularly preferably 0 to -0.06%. It is preferable that the hydraulic composition having the above-mentioned range and the characteristic of the rate of change in length can prevent the occurrence of cracks in the cured body itself and can maintain a high adhesive force with a concrete floor as a base. In addition, if the length change rate is out of the range, cracks may occur due to curing shrinkage of the mortar cured body, which is not preferable.

The hydraulic mortar prepared by mixing the hydraulic composition of the present invention and water can be applied to the floor, wall, ceiling, etc. of various buildings using a plasterer.
On the upper surface of the hydraulic mortar cured body of the present invention, a finishing layer such as various tiles can be appropriately selected and applied.

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) 0 stroke flow value, 15 stroke flow value (mm):
The zero hit flow value was measured for the kneaded mortar immediately after kneading in accordance with the flow test of the physical test method of JIS R 5201 cement, and the flow value without dropping motion immediately after removing the cone was measured.
The 15-stroke flow value was measured according to the flow test of the physical test method of JIS R 5201 cement immediately after kneading, 30 minutes after kneading, and 60 minutes after kneading.
2) SL flow value (mm):
The kneaded mortar was measured according to the method described in JASS 15M-103.
3) Trowel coating workability:
The kneaded mortar was taken on a iron board and applied to a concrete wall surface to a thickness of 5 mm using a plastering iron.
In the process of ironing, the iron feed (weight), the iron elongation (coating area), and the mortar after the ironing operation, there are three indicators for the sag of the mortar, very good: 3, The evaluation was as follows: good (no problem in practical use): 2, poor (practical problem): 1.
4) Shore hardness of the cured body surface:
Measures the hardness of the hardened surface at any 3 to 5 locations using a spring type hardness tester type D (manufactured by Ueshima Seisakusho Co., Ltd.) at a predetermined elapsed time after placing the hydraulic mortar. The average value of the readings of the spring type hardness tester type D gauge is defined as the surface hardness at that time.
5) Softness change:
The flow value (15 strokes) immediately after kneading and preparing the hydraulic mortar is X, the flow value (15 strokes) measured after a predetermined time after kneading is Y, and the change in softness (%) = [( X−Y) / X] × 100.
6) Bending strength (N / mm ² ), compressive strength (N / mm ² ):
The size of the test body is a prismatic test body (4 × 4 × 16 cm) having a cross section of 40 mm square and a length of 160 mm. According to JIS R 5201, material age is 1 day, material age is 7 days, material age is 28. The bending strength and compressive strength of the day were measured.
5) Length change:
The length change measurement test was performed according to the contact gauge method of JIS A 1129-1.

(Materials used): The hydraulic composition was prepared using the following materials.
The hydraulic composition which mixed the following raw material with the mixture ratio shown in Table 1 or Table 2 was used.
Alumina cement: Fondge, manufactured by Kerneos, Blaine specific surface area of 3100 cm ² / g.
Portland cement A: Hayashi Cement, manufactured by Ube Mitsubishi Cement Co., Ltd., Blaine specific surface area of 4500 cm ² / g.
Portland cement B: normal cement, manufactured by Ube Mitsubishi Cement Co., Ltd., Blaine specific surface area 3320 cm ² / g.
Gypsum: Type ^II anhydrous gypsum, manufactured by Central Glass Co., Ltd., Blaine specific surface area of 3460 cm ² / g.
Resin component A: A copolymer of acrylic ester / methacrylic ester, re-emulsified resin powder in which primary particles are coated with a water-soluble protective colloid of polyvinyl alcohol, manufactured by Nichigo Movinyl Co., Ltd., DM7000P.
Resin component B: ethylene / vinyl acetate copolymer, RE5044N, manufactured by Asahi Kasei Chemicals Corporation.
Silica sand A: No. 6 silica sand, manufactured by Tokai Sand Co., Ltd.
Silica sand B: No. 7 silica sand, manufactured by Ashiya Company.
Silica sand C: No. 5 silica sand, manufactured by Ashiya Company.
Table 4 shows the particle size distribution of [sand silica A, B, C and mixed sand of silica sand A and silica sand B (mixing ratio: silica sand A (parts by mass) / silica sand B (parts by mass) = 95/5)]. .
・ Samsui: Made by Hitachi Seisui.
-Perlite A: Special type 1, manufactured by Ube Industries, Ltd.
-Perlite B: TM3, manufactured by Toho Perlite.
Synthetic resin aggregate A: ethylene vinyl acetate copolymer (EVA chip), particle size of 2 mm or less, manufactured by Kingisha.
Synthetic resin aggregate B: Polypropylene crushed (PP chip), particle size of 2 mm or less, manufactured by Honma Works (Sekisui Chemical).
-Blast furnace slag fine powder: Rebirth, manufactured by Chiba Rebirth, Blaine specific surface area 4400 cm ² / g.
-Setting retarder A: L-sodium tartrate, manufactured by Fuso Chemical Industries.
-Setting retarder B: sodium bicarbonate, manufactured by Tosoh Corporation.
-Setting retarder C: Conchem A1, manufactured by Conchem.
-Setting accelerator A: Lithium carbonate, manufactured by Honjo Chemical Co., Ltd.
-Setting accelerator B: Aluminum sulfate, manufactured by Daimei Chemical Co., Ltd.
Thickener A: Hydroxyethyl methylcellulose thickener, Marporose MX-30000, manufactured by Matsumoto Yushi Co., Ltd.
-Thickener B: Methyl hydroxyethyl methylcellulose-based thickener, Tyroze MH6002P4, manufactured by Nichigo Movinyl Co., Ltd.
-Antifoaming agent: Polyether type antifoaming agent, 77P, manufactured by San Nopco.
-Fluidizer: Polycarboxylic acid fluidizer, manufactured by Kao Corporation.
・ Expansion material: Taiheiyo Gypcal, made by Taiheiyo Cement.

(Preparation of mortar for hydraulic composition)
A hydraulic composition is prepared at a blending ratio shown in Table 1 and Table 2, a predetermined amount of water is blended with respect to 100 parts by mass of the hydraulic composition, and kneaded for 3 minutes using a hand mixer with a rotational speed of 1100 rpm. A hydraulic mortar was prepared.

[Examples 1-3, Comparative Example 1, Reference Examples 1-2]
Hydraulic mortars were prepared using hydraulic compositions containing the components shown in Tables 1 and 2. Table 3 shows the results of evaluation of properties such as fluidity of mortar, troweling workability, and curing characteristics.

(1) In the case of the comparative example 1 using the fine aggregate which does not contain an appropriate amount of fine particles, immediately after preparing the hydraulic mortar and until 30 minutes after the preparation, the flow loss (flowable) Although no decrease was observed, a large flow loss (decrease in fluidity) was observed after 60 minutes from the preparation of the mortar. In addition, the softness change showed a relatively large softness change after 60 minutes from the preparation of the mortar.
(2) Reference Example 1 has good shore hardness, but hydraulic mortar has self-fluidity, so the fluidity is too high for mortar construction with a trowel, The troweling workability was extremely poor.
(3) Reference Example 2 uses a hydraulic component that does not contain alumina cement, and the mortar fluidity, troweling workability, and strength development properties at 28 days (long term) were good. After application, the initial hardness (several hours later to 1 day of age) has a small shore hardness expression, and the change in the length of the mortar cured body is -0.13%, a large value of -0.1% or more. showed that.
(4) In Examples 1 to 3, not only good fluidity is obtained immediately after kneading, but also the flow loss (reduced fluidity) is slight even when 60 minutes have elapsed since the hydraulic mortar was prepared. The fluidity retention state was good. Furthermore, the troweling workability is good, a shore hardness value of 10 or more is obtained 4 hours after the troweling operation, the bending strength is ^2.5 N / mm ² or more at one day of age, and the compression strength Was 10 N / mm ² or more. Also in the dimensional change of the cured body, a very small dimensional change is in the range of 0 to -0.02 in the case of the age of 7 days and in the range of 0 to -0.05 in the case of the age of 28 days. Showed the rate. In particular, in the case of Example 3, the shore hardness gradually increases from 3 hours to 6 hours after the application of the trowel, which is also good when mortar surface shaping / minor repair is required. Workability can be obtained.

Claims (11)

A hydraulic composition containing a hydraulic component containing alumina cement, a resin component, and a fine aggregate, and containing no fluidizing agent, and prepared by mixing and kneading the hydraulic composition and water A hydraulic composition having a flow value measured by a flow test in accordance with JASS 15M-103 for a hard mortar of 60 to 150 mm. The fine aggregate is 3-20% by mass of fine particles of 30 μm to less than 150 μm, 50-80% by mass of particles of 150 μm to less than 300 μm, and 15 particles of 300 μm to less than 850 μm in 100% by mass of the fine aggregate. The hydraulic composition according to claim 1, wherein the hydraulic composition contains ˜40 mass% and does not contain coarse particles of 850 μm or more. The hydraulic composition according to claim 1 or 2, wherein the hydraulic component comprises alumina cement, Portland cement, and gypsum. The resin component is a re-emulsified resin powder, the primary particle diameter of the resin powder is 0.2 to 0.8 μm, and the primary particle surface of the resin powder is coated with a water-soluble protective colloid of polyvinyl alcohol. The hydraulic composition according to claim 1, wherein the hydraulic composition is an acrylic copolymer re-emulsified resin powder. The hydraulic composition according to any one of claims 1 to 4, wherein the hydraulic composition does not include a lightweight aggregate. The hydraulic composition further includes at least one component selected from an inorganic powder, a setting modifier (setting retarder, or setting retarder and setting accelerator), a thickener, and an antifoaming agent. The hydraulic composition according to any one of claims 1 to 5. The shore hardness of the surface of a cured body of a hydraulic mortar prepared by kneading a hydraulic composition and water is 20 or more after 6 hours after the hydraulic mortar is applied by coating. 7. The hydraulic composition according to any one of 6 above. The length change rate of the hydraulic mortar cured body prepared by kneading the hydraulic composition and water is in the range of 0 to -0.05% for the 7-day mortar cured body, and the material age is 28 days. The hydraulic composition according to any one of claims 1 to 7, which is in a range of 0 to -0.1% in a mortar cured product. Curing of hydraulic mortar was prepared by kneading a water hydraulic composition is a bending strength of 1 day age of the 2N / mm ² or more, the compressive strength of 1 day age of the 8N / mm ² or more The hydraulic composition according to claim 1, wherein the hydraulic composition is any one of the following. The hydraulic composition according to any one of claims 1 to 9, wherein the hydraulic mortar prepared by kneading the hydraulic composition and water is applied to the wall surface by using a scissors. object. The concrete wall structure which has a mortar hardening body layer using the hydraulic composition of any one of Claims 1-10 in a surface layer.