JP2004300017A - High-strength hydraulic composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high-strength hydraulic composition suitably used as a surface finish material generating no color shading and air bubble and capable of improving compressive strength, bending strength, wear resistance, and a self-leveling property. <P>SOLUTION: The high-strength hydraulic composition comprises a hydraulic component, aggregate, and an emulsion, where the hydraulic component comprises alumina cement, portland cement, gypsum, and blast furnace slag, the aggregate has 83.5-99 wt.% of the cumulative percentage of remaining particles on a sieve of 106 μm and 5-15 wt.% of the cumulative percentage of remaining particles on a sieve of 600 μm, and the emulsion contains an emulsion with a glass transition point of ≥0°C. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  TECHNICAL FIELD The present invention relates to a high-strength hydraulic composition which is excellent in high strength and abrasion resistance and which can be used as a floor finishing material having self-leveling properties. Specifically, it can be used for adjusting and finishing the floor base of general buildings such as hospitals, schools, offices, apartments, houses, factories, warehouses, parking lots, gas stations, convenience stores, and kitchens.

The first condition that the hydraulic composition used as a self-leveling material should have is, of course, the high fluidity required to secure self-leveling, but it is loaded after finishing material construction. High durability is required in order to be able to withstand deformation or destruction received from the load of a load or running of a vehicle.
As for the composition having self-leveling properties, already in Patent Document 1, a hydraulic component composed of alumina cement, gypsum and blast furnace slag, a setting regulator composed of aluminum sulfates and lithium salts, a polymer emulsion, a water reducing agent, A hydraulic colored finish composition comprising a pigment, a thickener, and an antifoam is disclosed.

JP-A-10-273357

  As a high-strength hydraulic composition, it is a material having excellent working characteristics (high fluidity, long pot life) and curing characteristics (compressive strength, abrasion resistance, smoothness) and high strength development. In general, when the bending strength is increased, not only does the compressive strength decrease, but also depending on the composition, there is a problem that the fluidity decreases and material separation occurs with the improvement of the strength characteristics. Therefore, from the viewpoint of durability, a material that is excellent in both compressive strength and flexural strength and that has excellent surface properties without lowering fluidity is required.

An object of the present invention is to provide a high-strength hydraulic composition having excellent compressive strength, bending strength, and abrasion resistance.
Another object of the present invention is to provide a high-strength hydraulic composition having excellent self-leveling properties, compressive strength, bending strength, and abrasion resistance.
An object of the present invention is to provide a high-strength hydraulic composition that can be suitably used as a surface finishing material free from color unevenness and bubbles, and a high-strength hydraulic composition that can be used as a coloring finishing material.

  The present inventors have developed a high-strength hydraulic composition including a hydraulic component including alumina cement, Portland cement, gypsum and blast furnace slag, an aggregate having a specific particle size, and an emulsion having a high glass transition temperature. They have found that they have leveling properties and that the compressive strength, bending strength and abrasion resistance are improved, and the present invention has been completed.

The present invention is a high-strength hydraulic composition comprising a hydraulic component, an aggregate and an emulsion,
Hydraulic components include alumina cement, Portland cement, gypsum and blast furnace slag,
The aggregate is an aggregate having a residual accumulation ratio of 83.5 to 99% by weight at a particle diameter of 106 μm and a residual accumulation ratio of 5 to 15% by weight at a particle diameter of 600 μm,
The purpose of the emulsion is to provide a high-strength hydraulic composition characterized by containing an emulsion having a glass transition point of 0 ° C. or higher.

Preferred embodiments of the high-strength hydraulic composition of the present invention are shown below.
The emulsion preferably contains an acrylic resin emulsion having a glass transition point of 0 ° C. or higher.
The high-strength hydraulic composition of the present invention preferably contains 60 to 150 parts by mass of the aggregate and 4 to 20 parts by mass of the solid content of the emulsion based on 100 parts by mass of the hydraulic component.
In the high-strength hydraulic composition of the present invention, the hydraulic component contains, based on 100 parts by mass of alumina cement, 120 parts by mass or less of Portland cement, 30 to 100 parts by mass of gypsum, and 50 to 250 parts by mass of blast furnace slag. Is preferred.
In the high-strength hydraulic composition of the present invention, the aggregate preferably has a residual cumulative ratio of 30 to 82% by weight at a particle diameter of 300 µm.
The high-strength hydraulic composition of the present invention preferably contains a setting speed regulator, and further preferably contains a setting speed regulator, a thickener, a water reducing agent and an antifoaming agent.

  The high-strength hydraulic property of the present invention not only has sufficient fluidity as a self-leveling material, but also makes it possible to achieve both high compressive strength and high bending strength of a cured product by using a high Tg emulsion. Therefore, it also has extremely excellent characteristics in terms of durability. In addition, the use of aggregates with adjusted particle size, the optimal combination of a water reducing agent and a thickening agent that ensures fluidity even if the amount of water is reduced and does not cause material separation, and the use of an antifoaming agent In addition to preventing pigment segregation and completely eliminating the occurrence of color unevenness, it also prevents material separation on the surface of the cured product and prevents the generation of air bubbles, resulting in a high level of self-leveling that has never been seen before. Provides strength.

The high-strength hydraulic composition of the present invention is a high-strength hydraulic composition including a hydraulic component, an aggregate and an emulsion,
Hydraulic components include alumina cement, Portland cement, gypsum and blast furnace slag,
This is a high-strength hydraulic composition using an aggregate having a specific particle size and an emulsion having a glass transition point of 0 ° C. or higher.
The high-strength hydraulic composition of the present invention is based on 100 parts by weight of the hydraulic component.
(E) aggregate, preferably 60 to 150 parts by mass, further preferably 62 to 130 parts by mass, more preferably 63 to 100 parts by mass, particularly preferably 65 to 80 parts by mass,
And (F) a composition containing preferably 4 to 20 parts by mass, more preferably 5 to 18 parts by mass, more preferably 6 to 16 parts by mass, and particularly preferably 7 to 14 parts by mass of the solid content of the emulsion.

One of the important requirements that the self-leveling material should have is to have an appropriate rapid hardening property, but the fast curing property depends primarily on the type of hydraulic component contained. Portland cement systems have the disadvantage that curing speed is slow and drying shrinkage is large.On the other hand, quick-setting cement systems have the disadvantage that curing speed is improved, but fluidity is low and strength is low. Have.
In the high-strength hydraulic composition of the present invention, the use of a hydraulic component comprising alumina cement, Portland cement, gypsum and blast furnace slag compensates for each other's drawbacks and solves this problem.
The hydraulic component is based on (A) 100 parts by mass of alumina cement.
(B) Portland cement preferably 120 parts by mass or less, more preferably 5 to 115 parts by mass, more preferably 10 to 110 parts by mass, particularly preferably 20 to 100 parts by mass,
(C) gypsum preferably 30 to 100 parts by mass, more preferably 33 to 95 parts by mass, more preferably 35 to 90 parts by mass, particularly preferably 40 to 80 parts by mass,
And (D) the blast furnace slag preferably contains 50 to 250 parts by mass, more preferably 60 to 220 parts by mass, more preferably 70 to 180 parts by mass, and particularly preferably 80 to 140 parts by mass.

Alumina cement has potentially rapid hardening properties, and after hardening, gives a cured body having excellent chemical resistance and fire resistance. In addition, the presence of the blast furnace slag having latent hydraulic property also suppresses a drawback of the slag, which is a drawback, with time, in the strength of the cured product. Several types of alumina cements having different mineral compositions are known and commercially available, and the main component is monocalcium aluminate (CA). However, from the viewpoint of strength and coloring properties, there are many CA components and C ₄ Alumina cement having a small amount of small components such as AF is preferable.
Alumina cement is preferably 10% by mass or more, more preferably 15% by mass or more, more preferably 20% by mass or more, particularly preferably 23% by mass or more, preferably 100% by mass, based on 100% by mass of the hydraulic component. Below, it is preferable that the content is more preferably 60% by mass or less, more preferably 50% by mass or less, particularly preferably 40% by mass or less.

  As the Portland cement, ordinary Portland cement, early strength Portland cement and the like can be used. By using Portland cement as the hydraulic component, the effect of reducing cost is recognized and preferred. In addition, if the amount is too large, the fluidity may be reduced, which may cause the occurrence of efflorescence. Parts by weight, and preferably 120 parts by mass or less. The Portland cement is usually preferably Portland cement.

  Gypsum has rapid hardening properties and acts as a dimensional stability retaining component after curing, but its addition amount is preferably 30 to 100 parts by mass with respect to 100 parts by mass of alumina cement. If the amount is too small, the dimensional stability decreases. If the amount is too large, the water resistance decreases, and abnormal expansion due to water may occur. In addition, gypsum can be used alone or as a mixture of two or more gypsums, such as anhydrous, hemihydrate, and water, regardless of the type.

  The blast furnace slag not only increases the crack resistance of the cured product, but also has the effect of improving the strength of the cured product of the alumina cement. The amount of the blast furnace slag is preferably 50 to 250 parts by mass based on 100 parts by mass of the alumina cement. If the amount is too small, the shrinkage becomes large, and if it is too large, the strength may be reduced.

Aggregate is sieved with nominal size specified in JIS Z-8801.
(1) The residual cumulative ratio at a particle diameter of 106 μm is 83.5 to 99% by weight, preferably 84 to 98% by weight, more preferably 84.5 to 97% by weight, particularly preferably 85 to 96% by weight.
In addition, the residual cumulative ratio at a particle diameter of 600 μm is 5 to 15% by weight, preferably 5.1 to 14.5% by weight, further preferably 5.2 to 14% by weight, and more preferably 5.5 to 13.5% by weight. %, Particularly preferably 6 to 13% by weight, is excellent in fluidity, excellent in compressive strength, bending strength and abrasion resistance, and excellent in surface condition.
The aggregate further has a residual accumulation ratio at a particle diameter of 300 μm of preferably 30 to 82% by weight, more preferably 33 to 79% by weight, more preferably 37 to 77% by weight, particularly preferably 40 to 75% by weight. It is preferable that the compound has excellent fluidity, excellent compressive strength, bending strength and abrasion resistance, and excellent surface condition.
The aggregate further has a residual cumulative ratio at a particle diameter of 850 μm of preferably 2% by weight or less, more preferably 1.5% by weight or less, more preferably 1% by weight or less, particularly preferably 0.5% by weight or less. It is preferable that the compound has excellent fluidity, excellent compressive strength, bending strength and abrasion resistance, and excellent surface condition.
Aggregates that do not include those having a particle size exceeding 1000 μm can be used.

As the aggregate, use is made of siliceous fine aggregates such as silica sand and silica powder, slag, fly ash, limestone, talc, kaolin, alumina powder, titanium oxide, aluminum hydroxide, mica, pyrophyllite, zeolite, silica gel, and the like. be able to.
As the aggregate, two or more types of aggregate having different particle size distributions can be used in combination.
As the aggregate, a mixture of silica sand such as No. 5 silica sand, No. 6 silica sand and No. 7 silica sand, and an aggregate such as silica sand having a smaller particle size than No. 5 silica sand can be preferably used.

In the high-strength hydraulic composition of the present invention, the addition of the emulsion improves the adhesion to the underlying concrete, the abrasion resistance of the cured product, and the bending strength.
The glass transition temperature of the polymer component contained in the emulsion can be appropriately selected and used, and particularly, the glass transition temperature (Tg) is 0 ° C or higher, preferably 5 ° C or higher, more preferably 10 ° C or higher. As described above, by using an emulsion having a temperature of preferably 15 ° C. or higher, particularly preferably 20 ° C. or higher, the bending strength and the abrasion resistance can be increased without significantly lowering the compressive strength, and the occurrence of color unevenness and bubbles is generated. Is suppressed, so that the surface state is excellent and can be used as a finishing material.

  In the high-strength hydraulic composition of the present invention, in order to further increase the bending strength, it is effective to increase the amount of the emulsion added, but on the other hand, there is a disadvantage that the compressive strength is reduced. Therefore, the addition amount of the emulsion can be appropriately selected and used, but is preferably 4 to 20 parts by mass in terms of solid content with respect to 100 parts by mass of the hydraulic component, and if less than 4 parts by mass, the flexural strength is It is conceivable that the increase in abrasion resistance is not sufficient and the abrasion resistance is also reduced. When the amount exceeds 20 parts by mass, the viscosity of the slurry increases, the flowability decreases, the surface condition deteriorates, and the compressive strength decreases. It is not preferable because it may cause

  Emulsions are synthetic resin emulsions or polymer emulsions, such as polyvinyl acetate emulsions, copolymer emulsions of ethylene and vinyl acetate (ethylene-vinyl acetate copolymer emulsions), ethylene, vinyl acetate and (meth) acrylic acid derivatives. Copolymer emulsion, copolymer emulsion of ethylene and (meth) acrylic acid derivative, emulsion of poly (meth) acrylic acid derivative, copolymer emulsion of styrene and (meth) acrylic acid derivative, polychloroprene latex, acetic acid Ethylene, styrene, vinyl acetate, such as copolymer emulsion of vinyl and vinyl chloride, copolymer emulsion of styrene and butadiene, copolymer emulsion of acrylonitrile and butadiene, and emulsion of vinyl acetate and (meth) acrylic acid derivative ( Data) acrylic acid derivatives and the like may be used an emulsion of synthetic resin containing at least one kind. The (meth) acrylic acid derivative means derivatives such as acrylic acid and methacrylic acid, and esters thereof.

The emulsion preferably contains an acrylic resin emulsion in an amount of 70 to 100% by mass, more preferably 80 to 100% by mass, more preferably 90 to 100% by mass, and particularly preferably 95 to 100% by mass. It is preferable to increase the bending strength while doing so.
The emulsion has a glass transition temperature of 0 ° C. or higher, preferably 5 ° C. or higher, more preferably 10 ° C. or higher, more preferably 15 ° C. or higher, particularly preferably 20 ° C. or higher. More preferably, it contains 80 to 100% by mass, more preferably 90 to 100% by mass, and particularly preferably 95 to 100% by mass, in order to increase the bending strength while maintaining the compressive strength.
In particular, the emulsion has an acrylic resin emulsion having a glass transition temperature of 0 ° C. or higher, preferably 5 ° C. or higher, more preferably 10 ° C. or higher, more preferably 15 ° C. or higher, and particularly preferably 20 ° C. or higher. Those containing from 100 to 100% by mass, more preferably from 80 to 100% by mass, more preferably from 90 to 100% by mass, particularly preferably from 95 to 100% by mass are preferable in order to increase the bending strength while maintaining the compressive strength.

As the emulsion, those obtained by a known production method can be used.For example, in the presence of an emulsifier, a polymerization initiator is used to carry out emulsion polymerization of a polymerizable monomer as a raw material of a synthetic resin in water or a water-containing solvent using a polymerization initiator. It can be manufactured by such a method.
The emulsion includes a powder emulsion containing no water, and the use of the powder emulsion makes it possible to form all the components except for water into one package, which can be conveniently used at the construction site simply by adding water.

As the emulsifier, a known emulsifier can be used, and examples thereof include anionic, nonionic, cationic or amphoteric surfactants and protective colloids such as polyvinyl alcohol.
As the polymerization initiator, those capable of performing polymerization such as radical polymerization in water or a water-containing solvent are preferable, and hydrogen peroxide, peracetic acid, persulfuric acid or a water-soluble peroxide such as an ammonium salt or a sulfate thereof or the like. Salts and the like can be mentioned. Further, organic peroxides such as benzoyl peroxide, t-butyl hydroperoxide, 2,2′-azobisisobutylnitrile, and reducing agents such as sodium metasulfite and sodium pyrosulfite can be used in combination.
The amount of the polymerization initiator can be appropriately selected as long as the emulsion can be produced.

  In the emulsion, the solid content of the synthetic resin and the like contained in the emulsion can be appropriately selected, but is preferably 30 to 80 parts by mass, more preferably 40 to 60 parts by mass, per 100 parts by mass of the emulsion. If the amount is less than 30 parts by mass, curing may be difficult. If the amount is more than 80 parts by mass, the viscosity may be too high to lower the workability, or the coating film may not be formed uniformly.

Examples of the acrylic resin emulsion include one or more (meth) acrylate compounds such as alkyl (meth) acrylates such as methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, and 2-ethylhexyl (meth) acrylate. Those obtained by polymerizing two or more kinds, and those obtained by copolymerizing with a vinyl compound such as styrene, vinyl acetate, and vinylidene chloride copolymerizable with these monomers can be used. (Meth) acrylate means methacrylate and acrylate.
The acrylic resin emulsion is preferable because the polymer component contained in the emulsion is excellent in elongation by using a polymer that is not crosslinked, more preferably a polymer that is not crosslinked within or between polymers.

As the ethylene-vinyl acetate copolymer emulsion, a known emulsion obtained by copolymerizing ethylene and vinyl acetate can be used.
As the ethylene-vinyl acetate copolymer emulsion, those using a water-soluble polymer such as polyvinyl alcohol or a cellulose derivative as an emulsifier or protective colloid can be preferably used. In particular, the ethylene-vinyl acetate copolymer emulsion preferably uses polyvinyl alcohol as a protective colloid.
In the polymer component of the ethylene-vinyl acetate copolymer emulsion, the vinyl acetate content is preferably 30 to 90% by mass, more preferably 50 to 90% by mass, and particularly preferably 60 to 86% by mass.
The content of the ethylene-vinyl acetate copolymer component in the ethylene-vinyl acetate copolymer emulsion is preferably 40 to 65% by mass, more preferably 45 to 60% by mass, and particularly preferably 47 to 60% by mass.

In the high-strength hydraulic composition of the present invention, the setting speed regulator can be appropriately added within a range that does not impair the properties, depending on the hydraulic composition, and the components and amounts of the setting accelerator and the setting retarder are added. The fluidity and the pot life can be adjusted by appropriately selecting the mixing ratio.
When adjusting the fluidity and the pot life, the total amount of the setting accelerator, such as a lithium salt, and the setting retarder, such as a sodium salt, is set to be 0.1 to 100 parts by mass of the hydraulic component. It is preferably added in the range of 0.5 to 5 parts by mass, more preferably 0.1 to 2 parts by mass, particularly preferably 0.30 to 0.70 part by mass.
In the setting speed regulator, the molar ratio [(molar amount of setting retarder) / (molar amount of setting accelerator)] obtained by dividing the molar amount of the setting retarder by the molar amount of the setting accelerator is in the range of 1 to 50. When the molar ratio is less than 1, the setting time is short and the self-fluidity is reduced, so that the working time may be too short and may hinder the construction. Is reduced, and early opening may be difficult, which is not preferable.

As the setting accelerator, a known setting accelerator can be used. Examples of the setting accelerator include inorganic lithium salts and organic lithium salts such as organic acids such as lithium carbonate, lithium chloride, lithium sulfate, lithium nitrate, lithium hydroxide, lithium acetate, lithium tartrate, lithium malate and lithium citrate. And the like. In particular, lithium carbonate is preferable from the viewpoint of effect, availability, and price.
As the setting accelerator, it is preferable to use a particle size that does not hinder the properties, and it is preferable that the particle size be 50 μm or less.
In particular, when a lithium salt is used, the particle size of the lithium salt is preferably 50 μm or less, more preferably 30 μm or less, and particularly preferably 10 μm or less. When the particle size is larger than the above range, the solubility of the lithium salt is reduced, which is not preferable. In the colorant-added system, it is conspicuous as many fine spots, which may impair the aesthetic appearance.

  As the setting retarder, a known setting retarder can be used. As an example of a setting retarder, it is possible to use sodium salts such as inorganic sodium salts and organic sodium salts such as sodium sulfate, sodium phosphate, sodium bicarbonate, sodium tartrate, sodium malate, sodium citrate and sodium gluconate. I can do it. In particular, sodium bicarbonate and sodium tartrate are preferable in terms of effect, availability, and price. Attention should be paid to the fact that a large amount of addition may cause a decrease in fluidity, poor curing, or a surface failure due to the generation of breathing water.

The most basic requirement that a self-leveling material should have is high fluidity. In order to obtain a high-strength cured product, it is necessary to lower the water / hydraulic component ratio. However, in order to lower the water / hydraulic component and ensure high fluidity, it is preferable to add a water reducing agent. .
In particular, since the strength developability of alumina cement, which is one of the hydraulic components in the present invention, is greatly affected by the water / cement ratio, it is necessary to use a water reducing agent to reduce the water / hydraulic component ratio. preferable. Since addition of a water reducing agent tends to cause material separation, it is preferable to use a water reducing agent and a thickener in combination.
In the high-strength hydraulic composition of the present invention, the addition of a thickener and / or an antifoaming agent suppresses material separation and generation of bubbles on the surface of the cured product, and has a favorable effect on improving the appearance of the cured product. preferable.

As the water reducing agent, a naphthalene type, a melamine type, a polycarboxylic acid type, a lignin sulfonic acid type or the like can be used, and a polycarboxylic acid type is preferable in combination with a thickener used in combination.
The amount of the water reducing agent can be added within a range that does not impair the properties of the present invention, and is 0.05 to 5 parts by mass, more preferably 0.1 to 2 parts by mass, especially 0 to 100 parts by mass of the hydraulic component. 0.2 to 1 part by mass is preferred.

Thickeners, methylcellulose, cellulosic such as carboxymethylcellulose, gelatin, protein such as vectin, polyethylene glycol, polyethylene oxide, polyacrylamide, water-soluble polymer such as polyvinyl alcohol, latex, etc. can be used, especially Cellulose type or the like can be used.
The addition amount of the thickener can be added in a range that does not impair the properties of the present invention, and is 0.01 to 0.5 part by mass, more preferably 0.01 to 0.2 part by mass, per 100 parts by mass of the hydraulic component. It is preferable to include the parts by mass, particularly 0.01 to 0.1 parts by mass. If the amount of the thickener is increased, the flowability may decrease, which is not preferable.

The high-strength hydraulic composition of the present invention may contain an antifoaming agent for the purpose of improving the compression strength, abrasion resistance, and surface state of the cured product.
As the defoaming agent, known substances such as synthetic substances such as silicon-based, alcohol-based, polyether-based, mineral oil-based, and fluorine-based substances or natural substances derived from plants can be used.
The addition amount of the defoaming agent can be added in a range that does not impair the properties of the present invention, and is 2 parts by mass or less, further 1 part by mass or less, particularly 0.5 part by mass with respect to 100 parts by mass of the hydraulic component. The following is preferred. When the addition amount of the defoaming agent is larger than the above, the improvement of the defoaming effect may not be observed.

The high-strength hydraulic composition of the present invention can be used as a high-strength hydraulic composition for a colored surface finishing material by further adding a pigment.
The high-strength hydraulic composition of the present invention forms a colored cured product having a uniform hue without color unevenness, since the eccentricity of the pigment during curing is completely prevented. Without using a method of ironing after spreading the floor material on uncured concrete, or using a coated floor material that applies an epoxy resin to the concrete surface, a colored cured body with an excellent appearance can be prepared at the same time as the floor foundation preparation Obtainable.

Depending on the intended color, the pigment may be appropriately selected so as to exhibit the color.However, in view of the intended use of the cured product, those having excellent alkali resistance and weather resistance are preferable, and inorganic pigments and acrylic pigments are preferred. It is preferable to use a pigment.
Inorganic pigments include, for example, iron, chromium, titanium, cobalt, and other various metal oxides, hydroxides, or sulfides bearing the color names such as titanium white, red iron, titanium yellow, and yellow ocher. Colored products are commercially available, and commercially available products can be used alone or as a mixture of a plurality of colors.
The amount of the pigment to be added is determined depending on the desired color density, but is preferably 0.5 to 10 parts by mass with respect to 100 parts by mass of the hydraulic component.

  In using the high-strength hydraulic composition of the present invention, the amount of water can be appropriately selected and compounded, and is preferably an amount capable of obtaining a mortar having a flow value of 210 mm or more, and more preferably. Is preferably 23 to 30 parts by mass with respect to 100 parts by mass of the hydraulic component. If the amount of water is reduced below this appropriate range, an increase in compressive strength beyond that range is not expected, and the fluidity is greatly reduced, which is not preferable.On the other hand, if the amount of water exceeds this appropriate range, the compressive strength will be large. Not only because the surface condition such as color unevenness is deteriorated.

  In the high-strength hydraulic composition of the present invention, the pot life at 20 ° C. is preferably 0.5 to 2.5 hours, more preferably 0.75 to 2 hours, and particularly preferably 1 to 1.5 hours. Preferred for workability and cured surface condition.

  The high-strength hydraulic composition of the present invention can obtain a mortar having a flow value of preferably 210 mm or more.

High strength hydraulic composition of the present invention, the compressive strength preferably at an age of 7 days 40N / mm ² or more, more preferably 42N / mm ² or more, and particularly preferably to obtain 44N / mm ² or more cured Can be.
High strength hydraulic composition of the present invention, the compressive strength preferably at an age of 28 days 60N / mm ² or more, more preferably 61N / mm ² or more, and particularly preferably to obtain 62N / mm ² or more cured Can be.

The high-strength hydraulic composition of the present invention obtains a cured product having a flexural strength of preferably 7 N / mm ² or more, more preferably 9 N / mm ² or more, particularly preferably 10 N / mm ² or more at a material age of 7 days. Can be.
The high-strength hydraulic composition of the present invention obtains a cured product having a flexural strength of 28 days, preferably 10 N / mm ² or more, more preferably 11 N / mm ² or more, and particularly preferably 12 N / mm ² or more. Can be.

  The high-strength hydraulic composition of the present invention obtains a cured product having a surface hardness of preferably 10 or more, more preferably 12 or more, more preferably 15 or more, and particularly preferably 18 or more after 3 hours of casting the slurry. Can be.

The high-strength hydraulic composition of the present invention has an abrasion resistance of preferably 0.30 mm or less, more preferably 0.25 mm or less, more preferably 0.20 mm or less, particularly preferably 0.18 mm at a material age of 7 days. The following cured products can be obtained.
The high-strength hydraulic composition of the present invention has an abrasion resistance of preferably 0.25 mm or less, more preferably 0.20 mm or less, more preferably 0.18 mm or less, particularly preferably 0.16 mm at 28 days of age. The following cured products can be obtained.

When showing an example of the construction of the high-strength hydraulic composition of the present invention,
(1) Cast concrete or mortar on the roof, floor or wall, finish with iron, machine, etc., then harden concrete or mortar to form concrete layer,
(2) If necessary, a cured product layer of the primer is formed on the surface of the concrete layer,
(3) The mortar obtained by mixing the high-strength hydraulic composition of the present invention and water is poured by a general method using a mortar pump or the like, and if necessary, the slurry surface is leveled with a trowel or a register mark, and then the high-strength hydraulic The structure can be constructed by forming a cured product layer obtained by curing the composition.

The high-strength hydraulic composition of the present invention can be used for general buildings such as hospitals, schools, offices, apartments, houses, factories, warehouses, parking lots, gas stations, convenience stores, kitchens, and the like.
The high-strength hydraulic composition of the present invention can be used for floor preparation and finishing of general buildings such as hospitals, schools, offices, apartments, houses, factories, warehouses, parking lots, gas stations, convenience stores, and kitchens. Can be.
The high-strength hydraulic composition of the present invention can be used for self-fluidizing hospitals, schools, offices, condominiums, houses, factories, warehouses, parking lots, gas stations, convenience stores, kitchens, etc. It can be used for finishing and can be used as a high-strength hydraulic composition having self-leveling properties or self-flowability.

  Hereinafter, the present invention will be described in more detail based on examples. However, the present invention is not limited by the following examples.

The evaluation method will be described.
(1) Measurement of particle size of aggregate:
Aggregate 200g is 16 mesh (1000 μm residual), 20 mesh (850 μm residual), 24 mesh (710 μm residual), 28 mesh (600 μm residual), 35 mesh (425 μm residual), 48 mesh (300 μm residual), 70 mesh (212 μm residual) Using a sieve of 100 mesh (residual of 150 μm), 150 mesh (residual of 106 μm), and 200 mesh (residual of 75 μm), the mixture was shaken with a vibrating sieve for 20 minutes and separated. The weight of aggregate remaining in each mesh was measured.
The residual cumulative ratio is calculated according to the following formulas (1) to (3), and the other particle sizes other than 106 μm, 300 μm and 600 μm can be obtained in the same manner as in formula (1).

(2) Measurement of glass transition temperature (Tg):
An appropriate amount of an acrylic resin emulsion is dropped on a glass plate and dried at 60 ° C. for 16 hours. The resulting dried coating film having a mass in the range of 9.5 to 10.5 mg is subjected to a differential scanning calorimeter (Shimadzu Corporation) The glass transition temperature is measured using DSC-50).
The DSC measurement conditions were as follows: the temperature was raised from room temperature to 150 ° C. in 10 minutes, kept at 150 ° C. for 10 minutes, lowered to a temperature 50 ° C. lower than the Tg of the sample obtained by calculation, and then raised again to 150 ° C. in 10 minutes. When warming, a first measurement of Tg is made. Next, when the temperature is lowered to a temperature 50 ° C. lower than the Tg measured in the first time, the second time Tg is measured, and the value of the second time Tg is defined as the glass transition temperature.

(3) Mortar evaluation:
1) Flow value: The flow value of the resulting mortar is measured according to JASS 15M-103.
2) Compressive strength (N / mm ² ), flexural strength (N / mm ² ): The resulting mortar is packed into a 4 × 4 × 16 cm form shown in JIS R-5201, and the temperature is 20 ° C. and the humidity is After being cured in the air at 65% for 24 hours, it is demolded and further cured in the air for a predetermined period (7 days and 28 days) to obtain a molded body. The molded body is measured according to the method described in JIS R-5201.
3) Surface condition (unevenness of color, material separation and presence or absence of air bubbles): Pour the resulting mortar into a 2 × 1 m concrete floor at a thickness of 10 mm, and store for 28 days in an outside air temperature (temperature 20 ° C., humidity 65%) and naturally dried Cure to obtain a cured product. Observation is evaluated by visually observing color unevenness on the surface of the cured product, material separation, and the presence or absence of air bubbles.
-Uneven color (o: no, x: yes).
・ Material separation (○: none, ×: present).
-Air bubbles (o: no, x: present).

4) Surface hardness: The resulting mortar is poured into a 13 × 19 cm mold at a thickness of 10 mm, cured at a temperature of 20 ° C. and a humidity of 65%, and the surface hardness is measured 3 hours after casting. The surface hardness is measured by a spring type hardness meter type D.
5) Abrasion resistance (mm): The resulting mortar was poured into a mold of 11 × 11 cm at a thickness of 10 mm, cured in the air at a temperature of 20 ° C. and a humidity of 65% for 24 hours, then removed from the mold, and further in air. The molded body is obtained by additional curing for a predetermined period (7 days, 28 days). The wear test was performed using a molded body whose height was precisely measured, and a tapered abrasion tester was used to perform a wear test on the molded body under the conditions of a wear wheel GC150H, a load of 250 g, and a rotation number of 2,000 times. Measure the height of the molded body precisely. The abrasion resistance is a value obtained by subtracting the height of the molded body after the abrasion test from the height of the molded body before the abrasion test, “(height of the molded body before the abrasion test) − (the molded body after the abrasion test). Height) ".
The height is measured using a dial gauge.

[Examples 1 to 7 and Comparative Examples 1 to 5]
(1) Materials used: In carrying out each example, the following materials were used.
AC: Alumina cement (made by Lafarge aluminate: Brain specific surface area 3600 cm ² / g, monocalcium aluminate content 55% by weight)
・ PC: Early Portland Cement (Ube Mitsubishi Cement Co., Ltd .: Brain specific surface area 4500 cm ² / g)
Gypsum: Type ^II anhydrous gypsum (Central Glass Co., Ltd .: Blaine specific surface area 3300 cm ² / g)
・ Slag: Blast furnace slag (manufactured by Ube Mitsubishi Cement Co., Ltd .: Blaine specific surface area 4400 cm ² / g)
・ Aggregate A: mixture of No. 5 silica sand and No. 7 silica sand (mixing ratio 2: 1) (Miku Kaiun Co., Ltd.)
・ Aggregate B: mixture of No. 5 silica sand and No. 7 silica sand (mixing ratio 5: 1) (Miku Kaiun K.K.)
・ Aggregate C: A mixture of No. 5 silica sand and No. 7 silica sand (mixing ratio 1: 1) (Miku Shipping Co., Ltd.)
・ Aggregate D: No.5 silica sand (Miku Shipping Co., Ltd.)
・ Aggregate E: a mixture of No. 5 silica sand and No. 7 silica sand (mixing ratio 1: 2) (Miku Kaiun K.K.)
Accelerator A: lithium carbonate (Honjo Chemical Co., Ltd .: particle size 10 μm or less)
-Delaying agent A: sodium bicarbonate (manufactured by Tosoh Corporation)
-Delaying agent B: sodium tartrate (made by Fuso Chemical Industry Co., Ltd.)
EA: acrylic resin emulsion (Tg: 25 ° C.) (manufactured by Clariant Polymer Co., Ltd.)
-EB: acrylic resin emulsion (Tg: -8 ° C) (manufactured by Asahi Kasei Corporation)
-EC: acrylic resin emulsion (Tg: -22 ° C) (manufactured by Asahi Kasei Corporation)
・ Water reducer: Polycarboxylic acid-based water reducer (manufactured by Kao Corporation)
・ Thickener: Methylcellulose thickener (Matsumoto Yushi Seiyaku Co., Ltd.)
-Antifoaming agent: Polyether-based antifoaming agent (Asahi Denka Kogyo Co., Ltd.)
・ Pigment: Chromium oxide powder, particle diameter 0.3 μm (manufactured by Bayer Corporation)
Table 1 shows the residual cumulative ratio of the used aggregates A to E at each particle size.

(2) Preparation of mortar:
A hydraulic component having a ratio shown in Table 2 and an aggregate, an emulsion, a setting speed regulator, a water reducing agent, a thickener, a defoaming agent and a pigment having a ratio shown in Table 3 are added to 100 parts by mass of the hydraulic component. The resulting mixture was further mixed with water and kneaded for 3 minutes to obtain a resultant mortar. The materials used and the tools used were all stored in a constant temperature room at 20 ° C. for one day or more.
Using the resulting mortar, the flow value, compressive strength, bending strength, surface condition, surface hardness and abrasion resistance were evaluated. The results are shown in Table 4.
Further, as a result of visually observing the surface state of the cured product obtained from the resulting mortar, no efflorescence was observed on all cured product surfaces.

From the examples, the composition of the present invention has a mortar that has a flow value necessary for self-flowability, a short curing time, material separation during flow, and self-leveling without color unevenness. is there.
In the composition of the present invention, the obtained cured product has high compressive strength, sufficient bending strength, high abrasion resistance, and excellent surface condition.

Claims (6)

A high-strength hydraulic composition comprising a hydraulic component, an aggregate and an emulsion,
Hydraulic components include alumina cement, Portland cement, gypsum and blast furnace slag,
The aggregate is an aggregate having a residual cumulative ratio of 83.5 to 99% by weight at a particle diameter of 106 μm and a residual cumulative ratio of 5 to 15% by weight at a particle diameter of 600 μm. The emulsion has a glass transition point of 0 ° C. or higher. A high-strength hydraulic composition comprising an emulsion of   The high-strength hydraulic composition according to claim 1, comprising 60 to 150 parts by mass of the aggregate and 4 to 20 parts by mass of the emulsion based on 100 parts by mass of the hydraulic component.   The hydraulic component contains 120 to 100 parts by mass of Portland cement, 30 to 100 parts by mass of gypsum, and 50 to 250 parts by mass of blast furnace slag with respect to 100 parts by mass of alumina cement. 2. The high-strength hydraulic composition according to item 1.   The high-strength hydraulic composition according to any one of claims 1 to 3, wherein the aggregate further has a residual cumulative ratio of 30 to 82% by weight at a particle diameter of 300 µm.   The high-strength hydraulic composition according to any one of claims 1 to 4, wherein the high-strength hydraulic composition further includes a setting speed regulator. The high-strength hydraulic composition according to any one of claims 1 to 5, wherein the high-strength hydraulic composition further comprises a setting speed regulator, a thickener, a water reducing agent, and an antifoaming agent. .