JP2005289719A - High-strength hydraulic composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high-strength hydraulic composition which is excellent in compressive strength, bending strength and wear resistance and is excellent in self-leveling property, and is suitably usable as a surface finishing material which does not give rise to irregular colors and bubbles and is usable as a colored finishing material. <P>SOLUTION: The high-strength hydraulic composition includes a hydraulic component, aggregate and emulsion, wherein the hydraulic component includes alumina cement, portland cement, gypsum and blast furnace slag. The aggregate includes at least one or more kinds of hardness aggregates selected from alumina cement clinker aggregate, spinel, forsterite, and electric furnace oxide slag. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a high-strength hydraulic composition that is excellent in high strength and wear resistance and can be used for flooring materials having self-leveling properties. Specifically, it can be used for adjusting and finishing floor foundations of general buildings such as hospitals, schools, offices, condominiums, houses, factories, warehouses, parking lots, gas stations, convenience stores, and kitchens.

Naturally, the first condition that the hydraulic composition used as the self-leveling material should have is the high fluidity necessary to ensure self-leveling, but it is loaded after the finishing material is applied. High durability is required to withstand the deformation and destruction caused by the load of the load and the traveling of the vehicle.
Regarding the composition having self-leveling properties, in Patent Document 1, a hydraulic component composed of alumina cement, gypsum and blast furnace slag, a coagulation regulator composed of aluminum sulfates and lithium salt, a polymer emulsion, a water reducing agent, A hydraulic colored finish composition comprising a pigment, a thickener, and an antifoam is disclosed.

  As an abrasion resistant cement composition cement containing an abrasion resistant aggregate, Patent Document 2 discloses an abrasion resistant cement composition containing a fluidizing agent and an abrasion resistant aggregate.

JP-A-10-273357 JP-A-6-122536

  As a high-strength hydraulic composition, it is a material that is excellent in working characteristics (high fluidity, long pot life) and curing characteristics (compressive strength, wear resistance, smoothness) and has high strength development. In general, when the bending strength is increased, not only the compressive strength is lowered, but depending on the composition, there is a problem that fluidity is lowered or material separation is caused as the strength characteristics are improved. Therefore, from the viewpoint of durability, there is a demand for a material that is excellent in both compression strength and bending strength, and has excellent surface characteristics without decreasing fluidity.

An object of this invention is to provide the high intensity | strength hydraulic composition which is excellent in compressive strength, bending strength, and abrasion resistance.
Furthermore, this invention aims at provision of the high intensity | strength hydraulic composition which is excellent in self-leveling property, 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 finish that does not generate color unevenness or bubbles, and further a high-strength hydraulic composition that can be used as a colored finish.

  The inventors have disclosed a high-strength hydraulic composition comprising a hydraulic component including alumina cement, Portland cement, gypsum and blast furnace slag, an aggregate including a specific high-hardness aggregate, and an emulsion having a high glass transition temperature. The present invention was completed by finding that it has self-leveling properties and improved compression strength, bending strength and wear resistance.

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 to provide a high-strength hydraulic composition comprising at least one hardness aggregate selected from alumina cement clinker aggregate, spinel forsterite and electric furnace oxidation slag.

The preferable aspect of the high intensity | strength hydraulic composition of this invention is shown below.
The emulsion preferably includes an emulsion having a glass transition point of 0 ° C. or higher.
The emulsion preferably includes an acrylic resin emulsion.
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 with respect to 100 parts by mass of the hydraulic component.
The hydraulic component preferably includes 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 with respect to 100 parts by mass of alumina cement.
The high-strength hydraulic composition of the present invention preferably further contains a thickener, a water reducing agent and an antifoaming agent.
The aggregate preferably contains 30% by mass or more of a hardness aggregate selected from alumina cement clinker aggregate, spinel forsterite and electric furnace oxidation slag.

INDUSTRIAL APPLICABILITY The present invention can provide a high-strength hydraulic composition having high fluidity and excellent fluidity that is excellent in compressive strength, bending strength, abrasion resistance, and surface hardness.
The high-strength hydraulic composition of the present invention not only has sufficient fluidity as a self-leveling material, but it is possible to achieve both high compressive strength and high bending strength of the cured product by using a high Tg emulsion. Therefore, it has extremely excellent characteristics in terms of durability. In addition, the use of aggregate with adjusted particle size, the optimal combination of water reducing agent and thickener that ensures fluidity even when the amount of water is reduced, and does not cause material separation, in addition to the use of an antifoaming agent. In addition to preventing pigment dispersaling and eliminating color unevenness completely, it also prevents material separation and bubbles from being generated on the surface of the cured product. A high-strength hydraulic composition is provided.

The present invention is a high-strength hydraulic composition comprising a hydraulic component, a hardness aggregate and an emulsion,
Hydraulic components include alumina cement, Portland cement, gypsum and blast furnace slag,
The hardness aggregate is a high-strength hydraulic composition comprising at least one component selected from alumina cement clinker aggregate, spinel forsterite and electric furnace oxidation slag.

The high-strength hydraulic composition of the present invention is based on 100 parts by mass of the hydraulic component.
(E) Aggregate containing high hardness aggregate, preferably 40 to 300 parts by mass, more preferably 50 to 200 parts by mass, more preferably 60 to 150 parts by mass, and particularly preferably 70 to 100 parts by mass. .
And (F) a composition containing the solid content of the emulsion, 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.

One of the important requirements that the self-leveling material should have is that it has an appropriate rapid hardening property, but the rapid hardening property primarily depends on the type of hydraulic component contained. The Portland cement system has the disadvantages that the curing speed is slow and the drying shrinkage is large, while the fast-curing cement system has an improvement in terms of the curing speed, but has the disadvantage that the fluidity is low and the strength is low. Have.
In the high-strength hydraulic composition of the present invention, the use of hydraulic components made of alumina cement, Portland cement, gypsum and blast furnace slag compensates for each other's drawbacks and solves this problem.
The hydraulic component is (A) 100 parts by mass of alumina cement,
(B) Portland cement preferably 120 parts by weight or less, more preferably 5 to 115 parts by weight, more preferably 10 to 110 parts by weight, particularly preferably 20 to 100 parts by weight,
(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) Blast furnace slag, preferably 50 to 250 parts by mass, more preferably 60 to 220 parts by mass, more preferably 70 to 180 parts by mass, particularly preferably 80 to 140 parts by mass.

Alumina cement has a potentially rapid hardening property, and gives a cured product excellent in chemical resistance and fire resistance after curing. In addition, due to the presence of blast furnace slag having latent hydraulic properties, a decrease over time in the strength of the cured body, which is a drawback thereof, is suppressed. Several types of alumina cements having different mineral compositions are known and commercially available, and all of them are monocalcium aluminate (CA). However, in terms of strength and colorability, there are many CA components and C _4. Alumina cement with a small amount of small components such as AF is preferred.
The 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 from 23% by mass or more, preferably 100% by mass with respect to 100% by mass of the hydraulic component. In the following, it is preferable to include an amount in the range of 60% by mass or less, more preferably 50% by mass or less, and particularly preferably 40% by mass or less.

  As Portland cement, normal Portland cement, early-strength Portland cement, or the like can be used. The use of Portland cement as the hydraulic component is preferable because it is effective in reducing costs, and if the amount added is too large, fluidity may be reduced, which may cause generation of white flower. Preferably, 120 parts by mass or less is added to the part.

  Gypsum is hard and works as a component for maintaining dimensional stability after curing, but the 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 is lowered. If the amount is too large, the water resistance is lowered, and abnormal swelling due to water may occur. In addition, as for gypsum, each gypsum, such as anhydrous, semi-water, and 2 water, can be used as 1 type or a mixture of 2 or more types irrespective of the kind.

  The blast furnace slag not only increases the crack resistance of the hardened body, but also has the effect of improving the hardened body strength of the alumina cement. It is also effective in reducing costs. The amount of blast furnace slag added is preferably 50 to 250 parts by mass with respect to 100 parts by mass of alumina cement. If the amount is too small, the shrinkage increases. If the amount is too large, the strength may decrease.

  The aggregate is a hardness aggregate selected from alumina cement clinker aggregate, spinel forsterite and electric furnace oxidation slag in 100% by mass of aggregate, preferably 30% by mass or more, more preferably 50% by mass or more, and more. It is preferable to use an aggregate containing 70% by mass or more, particularly preferably 80% by mass or more.

As the high-hardness aggregate, alumina cement clinker aggregate, spinel forsterite, and electric furnace oxidation slag can be used alone or as a mixture of two or more thereof.
The particle diameter of the high hardness aggregate is preferably 1500 μm or less.

Spinel forsterite is composed mainly of MgAl ₂ O ₄ .Mg ₂ SiO ₄ and has high hardness and excellent wear resistance. Although it exists as a natural product, it can also be obtained artificially by cooling the slag produced as a by-product in the process of producing high carbon ferrochrome (FeCr), which is a raw material for stainless steel, and pulverizing, classifying and sizing. Both natural products and artificial products can be used.

Electric furnace oxidation slag is different from blast furnace slag obtained by cooling, pulverizing and classifying a blast furnace that produces pig iron, cooling the by-product slag obtained from the steelmaking process using the electric furnace, pulverizing, classifying and sizing It is the oxidation slag obtained by this. This main mineral composition consists of FeO, MgFeAlO ₄ and amorphous silicate.

The alumina cement clinker aggregate has basically the same mineral composition as that of the alumina cement, and has a very good bondability with the alumina cement.
The alumina cement clinker aggregate preferably has a particle size of 75 μm to 1500 μm, and more preferably has a particle size of 1000 μm or less in order to prevent material separation resistance.
The alumina cement clinker aggregate has a particle size of 75 μm to 1500 μm and is a particle size captured using two kinds of sieves having openings of 75 μm to 1500 μm.

Aggregates include fine silica aggregates such as quartz sand and quartzite powder, slag, fly ash, limestone, talc, kaolin, alumina powder, titanium oxide, aluminum hydroxide, mica, pyrophyllite, excluding high-hardness aggregates Further, known aggregates such as zeolite and silica gel can be used in combination.
As the aggregate, two or more kinds of aggregates having different particle size distributions can be mixed and used.
As the aggregate, a mixture of No. 5 silica sand, No. 6 silica sand, No. 7 silica sand and the like such as No. 5 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 base concrete, the wear resistance of the cured body, and the bending strength.
The glass transition temperature of the polymer component contained in the emulsion can be appropriately selected and used, but in particular, the glass transition temperature (Tg) is 0 ° C. or higher, preferably 5 ° C. or higher, more preferably 10 ° C. As described above, by using an emulsion of 15 ° C. or more, particularly preferably 20 ° C. or more, the bending strength and wear resistance can be increased without greatly reducing the compressive strength, and color unevenness and bubbles are generated. Is suppressed, the surface state is excellent and can be used as a finishing material.

  In the high-strength hydraulic composition of the present invention, to increase the bending strength, it is effective to increase the addition amount of the emulsion, but on the other hand, it has a disadvantage that the compressive strength is lowered. Therefore, the addition amount of the solid content of the emulsion can be appropriately selected and used. However, the solid content of the emulsion is preferably 4 to 20 parts by mass, more preferably 5 to 18 with respect to 100 parts by mass of the hydraulic component. The mass is more preferably 6 to 16 parts by mass, and particularly preferably 7 to 14 parts by mass. If the amount is less than 4 parts by mass, the bending strength may not be sufficiently increased and the wear resistance may be reduced. If the amount exceeds 20 parts by mass, the viscosity of the slurry increases, and the fluidity decreases and the surface state decreases. It is not preferable because it is considered that the defect and the compression strength are reduced.

  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, emulsion of vinyl acetate and (meth) acrylic acid derivatives, ( Data) acrylic acid derivatives and the like may be used an emulsion of synthetic resin containing at least one kind. A (meth) acrylic acid derivative means derivatives, such as acrylic acid and methacrylic acid, these esters.

The emulsion preferably has a solid content of the acrylic resin emulsion of 100 to 100% by mass of the emulsion, preferably 70 to 100% by mass, more preferably 80 to 100% by mass, more preferably 90 to 100% by mass, and particularly preferably. Is preferably an emulsion containing 95 to 100% by mass in order to increase the bending strength while maintaining the compressive strength.
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, and particularly preferably 20 ° C. or higher. A material containing 100% by mass, more preferably 80-100% by mass, more preferably 90-100% by mass, and particularly preferably 95-100% by mass is preferable for increasing the bending strength while maintaining the compressive strength.
In particular, 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. Preferably, the content containing 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 in the minute has bending strength while maintaining compressive strength. Preferred for increasing.

As the emulsion, one obtained by a known production method can be used. For example, by using a polymerization initiator in the presence of an emulsifier, a polymerizable monomer that is a raw material for a synthetic resin is emulsion-polymerized in water or a hydrous solvent. It can manufacture by the method to do.
The emulsion includes a powder emulsion that does not contain water. When the powder emulsion is used, all components except for water can be made into one package, which is convenient because it can be used by simply adding water at the construction site.

As the emulsifier, known ones 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 polymerization such as radical polymerization in water or a water-containing solvent are preferable. Hydrogen peroxide, peracetic acid, persulfuric acid, water-soluble peroxides such as ammonium salts and sulfates thereof, and the like A salt etc. 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 used can be appropriately selected as long as the emulsion can be produced.

  The emulsion may have a solid content such as a synthetic resin contained in the emulsion as appropriate, but is preferably 30 to 80 parts by mass and more preferably 40 to 60 parts by mass in 100 parts by mass of the emulsion. If it is less than 30 parts by mass, it may be difficult to cure, and if it exceeds 80 parts by mass, the viscosity may be too high and workability may be lowered, or a coating film may not be formed uniformly.

As the acrylic resin emulsion, one or more (meth) acrylate compounds such as alkyl (meth) acrylate such as methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, or the like Those obtained by polymerizing two or more kinds, and those obtained by copolymerization with vinyl compounds such as styrene, vinyl acetate and vinylidene chloride which can be copolymerized 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 water-soluble polymers such as polyvinyl alcohol and cellulose derivatives as emulsifiers and protective colloids can be preferably used. In particular, the ethylene-vinyl acetate copolymer emulsion is preferably one using 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 rate adjusting agent can be appropriately added according to the hydraulic composition as long as the characteristics are not impaired, and the components and amounts of setting accelerator and setting retarder In addition, the fluidity and pot life can be adjusted by appropriately selecting the mixing ratio.

  A known setting accelerator can be used as the setting accelerator. Examples of setting accelerators include inorganic and organic lithium salts such as lithium carbonate, lithium chloride, lithium sulfate, lithium nitrate, lithium hydroxide, lithium acetate, lithium tartrate, lithium malate, lithium citrate, and other organic acids. Lithium salt such as can be used.

  As the setting retarder, a known setting retarder can be used. As an example of a set retarder, it is possible to use sodium salts such as inorganic sodium salt and organic sodium salt such as sodium sulfate, sodium phosphate, sodium bicarbonate, sodium tartrate, sodium malate, sodium citrate, sodium gluconate. I can do it.

The most basic requirement that a self-leveling material should have is high fluidity. In order to obtain a high-strength cured body, it is necessary to lower the water / hydraulic component ratio, but in order to ensure high fluidity by lowering the water / hydraulic component, it is preferable to add a water reducing agent. .
In particular, the strength development of alumina cement, which is one of the hydraulic components in the present invention, is greatly affected by the water / cement ratio. Therefore, a water reducing agent can be used 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 thickening agent and / or an antifoaming agent suppresses material separation and generation of bubbles on the surface of the cured body, and has a favorable effect on improving the appearance of the cured body. preferable.

As the water reducing agent, naphthalene-based, melamine-based, polycarboxylic acid-based, lignin sulfonic acid-based, and the like can be used, and a polycarboxylic acid-based one is preferable for an optimal combination with a thickener used in combination.
The addition amount of the water reducing agent can be added within a range that does not impair the characteristics of the present invention. .2 to 1 part by mass is preferred.

As the thickener, a cellulose type such as methyl cellulose and carboxymethyl cellulose, a protein type such as gelatin and bectin, a water-soluble polymer type such as polyethylene glycol, polyethylene oxide, polyacrylamide, and polyvinyl alcohol, and a latex type can be used. Cellulose and the like can be used.
The addition amount of the thickener can be added within a range that does not impair the characteristics of the present invention, and is 0.01 to 0.5 parts by mass, more preferably 0.01 to 0.2 parts by mass with respect to 100 parts by mass of the hydraulic component. It is preferable to contain a mass part, especially 0.01-0.1 mass part. If the amount of the thickener added is increased, the fluidity may be lowered, which is not preferable.

The high-strength hydraulic composition of the present invention can contain an antifoaming agent for the purpose of improving the compression strength, abrasion resistance, and surface state of the cured product.
As the antifoaming agent, known materials such as synthetic materials such as silicon-based, alcohol-based, polyether-based, mineral oil-based, and fluorine-based materials or plant-derived natural materials can be used.
The addition amount of the antifoaming agent can be added within a range that does not impair the characteristics of the present invention. The following is preferred. When the defoaming agent is added in a larger amount than the above, the defoaming effect may not be improved.

The high-strength hydraulic composition of the present invention can be used as a high-strength hydraulic composition for a colored surface finish by further adding a pigment.
The high-strength hydraulic composition of the present invention completely prevents pigment segregation during curing, and thus forms a colored cured body having a uniform hue without color unevenness. A colored hardened body with excellent aesthetics can be produced at the same time as the floor foundation preparation, without using a method of finishing the iron after spreading the flooring on uncured concrete or using a flooring material that applies epoxy resin to the concrete surface. Can be obtained.

The pigment is appropriately selected depending on the target color, but is preferably excellent in alkali resistance and weather resistance in view of the intended use of the cured product. It is preferable to use a pigment.
Inorganic pigments include, for example, iron, chromium, titanium, cobalt, and other various metal oxides, hydroxides, or sulfides with color names such as titanium white, bengara, titanium yellow, and yellow ocher. The thing of the color is marketed and can use a commercial item individually or as a mixed color which mixed multiple.
The addition amount of the pigment is determined by the target 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 blending amount of water can be appropriately selected and blended, and is preferably an amount capable of obtaining a mortar having a flow value of 210 mm or more, more preferably It is preferable to set it as 23-30 mass parts with respect to 100 mass parts of hydraulic components. If the amount of water is reduced below this proper range, it is not preferable because the compressive strength cannot be expected to increase beyond that range, and the fluidity is greatly lowered. This is not preferable because the surface condition such as color unevenness deteriorates.

  In the high-strength hydraulic composition of the present invention, the pot life at 20 ° C. is preferably 0.5 to 3 hours, more preferably 0.75 to 2.5 hours, particularly preferably 1 to 2 hours. Is preferable because of its excellent 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.

The high-strength hydraulic composition of the present invention obtains a cured product having a compressive strength of 7 days old, preferably 40 N / mm ² or more, more preferably 45 N / mm ² or more, and particularly preferably 50 N / mm ² or more. Can do.
High strength hydraulic composition of the present invention, compressive strength is preferably at an age of 28 days 60N / mm ² or more, more preferably 62N / mm ² or more, more preferably 65N / mm ² or more, particularly preferably 68N / A cured product of mm ² or more can be obtained.

The high-strength hydraulic composition of the present invention provides a cured product having a bending strength of 7 N days, preferably 8 N / mm ² or more, more preferably 9 N / mm ² or more, and particularly preferably 10 N / mm ² or more. Can do.
The high-strength hydraulic composition of the present invention obtains a cured product having a bending strength of 28 N days or more, preferably 12 N / mm ² or more, more preferably 13 N / mm ² or more, and particularly preferably 14 N / mm ² or more. Can do.

The high-strength hydraulic composition of the present invention provides a cured product having an abrasion resistance of 7 days old, preferably 0.5 mm or less, more preferably 0.4 mm or less, and particularly preferably 0.3 mm or less. Can do.
The high-strength hydraulic composition of the present invention provides a cured product having an abrasion resistance of 28 days old, preferably 0.5 mm or less, more preferably 0.4 mm or less, and particularly preferably 0.3 mm or less. Can do.

When showing an example of the construction of the high-strength hydraulic composition of the present invention,
(1) Placing concrete or mortar on the roof, floor or wall, finishing it with a trowel, machine, etc., then curing the concrete or mortar to form a concrete layer,
(2) If necessary, a cured layer of primer is formed on the surface of the concrete layer,
(3) The mortar mixed with the high-strength hydraulic composition of the present invention and water is poured by a general method using a mortar pump, etc., and the slurry surface is leveled with a trowel or dragonfly as necessary, and then high-strength hydraulic A 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, condominiums, houses, factories, warehouses, parking lots, gas stations, convenience stores, kitchens, and the like.
The high-strength hydraulic composition of the present invention is used for adjusting and finishing floor foundations of general buildings such as hospitals, schools, offices, condominiums, houses, factories, warehouses, parking lots, gas stations, convenience stores, kitchens, etc. Can do.
The high-strength hydraulic composition of the present invention is used for adjusting and finishing floor foundations of general buildings such as hospitals, schools, offices, condominiums, houses, factories, warehouses, parking lots, gas stations, convenience stores, kitchens, etc. It can be used as a high-strength hydraulic composition having leveling properties or self-fluidity.

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

(1) Measurement of glass transition temperature (Tg):
A suitable amount of 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 converted into a differential scanning calorimeter (Shimadzu Corporation). The glass transition temperature is measured using DSC-50).
The DSC measurement conditions were that the temperature was raised from room temperature to 150 ° C. in 10 minutes, held at 150 ° C. for 10 minutes, lowered to a temperature lower by 50 ° C. than the Tg of the sample obtained by calculation, and again raised to 150 ° C. in 10 minutes. When warming, the first Tg is measured. Next, when the temperature is lowered to 50 ° C. lower than the Tg measured in the first time, the second Tg is measured, and the second Tg value is defined as the glass transition temperature. (The Tg of the emulsion is calculated using the Tg of the homopolymer and a known method is used.)

(2) Mortar evaluation:
1) Flow value: The flow value of the generated mortar is measured according to JASS 15M-103.
2) Compressive strength (N / mm ² ), bending strength (N / mm ² ): The produced mortar is packed in a 4 × 4 × 16 cm mold shown in JIS R-5201, and the temperature is 20 ° C. and humidity After being cured in air at 65% for 24 hours, it is demolded and further cured in the air for a predetermined period (7 days, 28 days) to obtain a molded body. The molded body is measured according to the method described in JIS / R-5201.
3) Surface condition (color unevenness, material separation and presence / absence of bubbles): The generated mortar is poured into a 30 × 30 cm concrete pavement plate at a thickness of 10 mm, and cured for 28 days at a temperature of 20 ° C. and a humidity of 65% to obtain a cured product. . Visual observation is evaluated for color unevenness on the surface of the cured product, material separation, and the presence or absence of bubbles.
-Material separation (O: none, x: present).
-Air bubbles (○: none, x: present).

4) Surface hardness: The produced 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 after one day of placing is measured. The surface hardness is measured with a spring type hardness tester type D type.
5) Abrasion resistance (mm): The produced mortar was poured into an 11 × 11 cm mold at a thickness of 10 mm, cured in air at a temperature of 20 ° C. and a humidity of 65% for 24 hours, demolded, and further in the air. Additional molding is performed for a predetermined period (7 days, 28 days) to obtain a molded body. For the wear test, a molded body whose height was precisely measured was used. A taper wear tester was used to perform a wear test of the molded body under the conditions of a wear wheel GC150H, a load of 250 g, and a rotational speed of 2000 times. Precisely measure the height of the molded body. Abrasion resistance is the value obtained by subtracting the height of the molded body after the wear test from the height of the molded body before the wear test ("the height of the molded body before the wear test)-(the molded body after the wear test." Height) ”.
The height is measured using a dial gauge.

[Examples 1-3 and Comparative Examples 1-2]
(1) Materials used: In carrying out each example, the following materials were used.
AC: Alumina cement (manufactured by Lafarge Aluminate, Blaine specific surface area 3600 cm ² / g, monocalcium aluminate content 55 wt%).
PC: Hayashi Portland cement (manufactured by Ube Mitsubishi Cement Co., Ltd .: Blaine specific surface area 4500 cm ² / g).
Gypsum: type II anhydrous gypsum (manufactured by 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: Spinel forsterite (manufactured by Shunan Technochrome Co., Ltd., trade name: PS Sand No. 7).
Aggregate B: Electric furnace oxidation slag (manufactured by Daiichi Sangyo Chemical Co., Ltd., trade name: CK Hypergrid No. 1).
Aggregate C: Alumina cement clinker aggregate (manufactured by Lafarge Aluminate Co., Ltd .: product with a maximum particle size of 1 mm or less).
Water reducing agent: Polycarboxylic acid water reducing agent (manufactured by Kao Corporation).
-Thickener: Methylcellulose thickener (Matsumoto Yushi Seiyaku Co., Ltd.).
-Antifoaming agent: Polyether type antifoaming agent (Asahi Denka Kogyo Co., Ltd.).
EA: acrylic resin emulsion (Tg: 25 ° C., catalog value) (manufactured by Clariant Polymer Co., Ltd., solid content: 50% by mass).

(2) Preparation of mortar:
Add water further to the hydraulic component in the ratio shown in Table 1 and the aggregate, water reducing agent, thickener and antifoaming agent in the ratio shown in Table 2 to 100 parts by mass of the hydraulic component. The mortar was obtained by kneading for minutes.
Using the obtained mortar, the flow value, compressive strength, bending strength, surface hardness and abrasion resistance were evaluated, and the results are shown in Table 3.
Further, as a result of visual observation of the surface state of the cured product obtained from the mortar, no white flower was observed on the surfaces of all the cured products.

The composition of the present invention has a flow value necessary for self-fluidity (a mortar having a flow value of 210 mm or more), and the resulting cured product has high compressive strength, sufficient bending strength, and high wear resistance. The surface condition is also excellent.

Claims (4)

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,
A high-strength hydraulic composition characterized in that the aggregate contains at least one hardness aggregate selected from alumina cement clinker aggregate, spinel forsterite and electric furnace oxidation slag.   2. The high-strength hydraulic composition according to claim 1, comprising 40 to 300 parts by mass of aggregate and 4 to 20 parts by mass of solid content of emulsion with respect to 100 parts by mass of hydraulic component.   The hydraulic component contains 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 with respect to 100 parts by mass of alumina cement. 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 high-strength hydraulic composition further includes a thickener, a water reducing agent, and an antifoaming agent.