JP2010018493A - Hydraulic composition and structure using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hydraulic composition having excellent handling property (usable time), trowel workability, quick hardening property-early strength development when mortal finishing is carried out by plastering workers in building construction and to particularly provide the hydraulic composition which is used for filling recessed parts or gaps on the base surface of the structure such as various buildings and excellent in trowel workability, quick hardening property and dimensional stability. <P>SOLUTION: The hydraulic composition contains a hydraulic component containing alumina cement, and a resin component and fine aggregate and does not contain a fluidizing agent. Hydraulic mortar prepared by mixing and kneading the hydraulic composition with water, has a flow value of 55-85 mm, measured by a flow test based on JASS 15M-103. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention is a hydraulic composition that is excellent in workability, quick hardening, and dimensional stability when constructed on the surface layer of a structure such as various buildings, and a structure obtained by using the hydraulic composition. About the body. In particular, the present invention is a coating workability, quick-hardness, and dimensional stability when repairing defects or recesses in the surface layer portion of structures such as various buildings and filling the gap. The present invention relates to a hydraulic composition having excellent properties and a structure obtained by using the hydraulic composition.

  The mortar coating finish on the concrete surface is used in a wide variety of places because the construction is simple 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 surface of concrete using a flaw.

  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. On the other hand, a mortar containing 20 to 300 parts by weight of Portland cement, 10 to 100 parts by weight of gypsum, 0.1 to 5 parts by weight of a curing accelerator and 0.1 to 5 parts by weight of a curing retarder is 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 provides a hydraulic composition that is excellent in handling properties (pot life), lacquering workability, quick hardening and early strength development when a plasterer performs mortar finishing in construction work. The purpose is to do. In particular, the present invention can be used for repairing defects and recesses in the surface layer portion of structures such as various buildings, and filling gaps. It aims at providing the hydraulic composition which is excellent in.

  As a result of diligent research and development on the above problems, the present inventors have achieved excellent handling by using a hydraulic composition containing a hydraulic component excellent in quick curing and quick drying and a specific resin component. (Long pot life) and good glazing workability, good shape retention after construction, and after a predetermined pot life has passed, curing progressed quickly and early strength developed The present invention was completed by finding an excellent hydraulic composition.

  That is, 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. The hydraulic composition is mixed with water. The hydraulic mortar prepared by kneading is a hydraulic composition characterized in that a flow value measured by a flow test in accordance with JASS 15M-103 is 55 to 85 mm.

The preferable aspect of the hydraulic composition of this invention is shown below. In the present invention, these embodiments can be appropriately combined.
(1) The hydraulic component is composed of alumina cement, Portland cement and gypsum.
(2) The resin component is a re-emulsifying resin powder, the primary particles of the re-emulsifying resin powder have an average particle size of 0.2 to 0.8 μm, and the primary particle surface of the re-emulsifying resin powder is polyvinyl. An acrylic copolymer re-emulsifying resin powder coated with a water-soluble protective colloid of alcohol.
(3) The hydraulic composition does not contain a lightweight aggregate.
(4) The hydraulic composition further contains at least one component selected from a setting modifier and a thickener.
(5) The change in the length of the cured hydraulic mortar obtained by curing the hydraulic mortar prepared by kneading the hydraulic composition and water is in the range of 0 to -0.07% at 7 days of age. Yes, in the range of 0 to -0.07% at the age of 28 days.
(6) The hydraulic composition is a hydraulic composition for applying a hydraulic mortar prepared by kneading the hydraulic composition and water to the surface layer portion of the structure using a scissors. .

  Moreover, this invention is a structure which has the hydraulic mortar hardened | cured material which hardened the hydraulic mortar obtained using said hydraulic composition in at least one part of the surface layer part of a structure.

  According to the present invention, when a plasterer performs a mortar finish or mortar ground treatment in a construction work, it is easy to handle (pot life), glazing workability, quick hardening / early strength development, and dimensional stability. An excellent hydraulic composition can be obtained.

  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. Moreover, when preparing the hydraulic composition of this invention by mixing with water and setting it as hydraulic mortar, the flow value measured by the flow test based on JASS 15M-103 is 55-85 mm. Moreover, 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. The hydraulic composition of the present invention is excellent in handling properties (pot life), glazing workability, quick hardening and early strength development, so that it is used as a mortar for plasterers to finish mortar in construction work. It can be used suitably.

  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.

  By blending various pigments with the hydraulic composition of the present invention, a colored cured mortar cured body (cured mortar cured body) can be obtained. When various pigments are blended in the hydraulic composition of the present invention, it is preferable to use white alumina cement having high whiteness as the alumina cement.

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

  When various pigments are blended in the hydraulic composition of the present invention to obtain a colored hydraulic mortar cured body, it is preferable to use white Portland cement having high whiteness as Portland cement.

  As for the 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. The hydraulic component is preferably composed of 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 when the total mass of alumina cement, Portland cement and gypsum is 100 parts by mass. Composition, more preferably a composition comprising 30 to 70 parts by weight of alumina cement, 15 to 60 parts by weight of Portland cement and 10 to 40 parts by weight of gypsum, more preferably 35 to 60 parts by weight of alumina cement, 20 to 50 parts by weight of Portland cement and By using a composition comprising 15 to 35 parts by mass of gypsum, particularly preferably a composition comprising 40 to 50 parts by mass of alumina cement, 25 to 40 parts by mass of Portland cement, and 17 to 27 parts by mass of gypsum, it has fast hardening and quick drying properties. Low shrinkage or low expansion and little volume change during curing It preferred for the cured body which suppresses the occurrence of cracks can be 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-emulsifying 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 generation of wrinkles and bubble marks due to drying of the surface of the hardened mortar cured body when applying the hydraulic mortar, and generation of bleeding water due to material separation. Re-emulsified resin powder is used to give the effect of significantly improving the finish as well as the effect of increasing the elasticity of the cured body to prevent cracking and improving the adhesive strength between the cured body and the substrate. To do. By using the re-emulsifying resin powder, the above effects can be obtained, and a cured mortar body having excellent durability and weather resistance can be obtained.

  About the manufacturing method of a resin component, the kind and process in particular are not limited, What was manufactured with the well-known manufacturing method can be used. Moreover, as a resin component, what has adhered the antiblocking agent mainly to the surface of the resin component can be used. Further, as the resin component, a re-emulsification type resin powder obtained by removing the solvent and drying the aqueous polymer dispersion by a method such as spraying or freeze drying can be 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 primary particles (emulsion particles) of a resin component such as an acrylic copolymer re-emulsifying resin powder is preferably in the range of 0.2 to 0.8 μm, more preferably 0.25 to 0.25. It is in the range of 0.75 μm, more preferably in the range of 0.3 to 0.7 μm, and particularly preferably in the range of 0.35 to 0.65 μm. A hydraulic composition containing a re-emulsifying resin powder having an average particle size of such primary particles is excellent in workability and excellent adhesion, durability and weather resistance obtained by forming a dense polymer film. And can be obtained together.

  In the case of hydraulic mortar using an acrylic copolymer-based re-emulsifying resin powder having an average particle size of the primary particle of the resin component in the above range, when the surface of the mortar is smoothed using a plasterer, etc. Feedability and stretchability can be obtained.

  When the average particle diameter of the primary particles of the resin component is larger than the above range, the workability at the time of mortar construction using the hydraulic composition having the resin component is good, but the adhesiveness and durability of the mortar cured body The weather resistance may be reduced. In addition, when the average particle size of the primary particles of the resin component is smaller than the above range, the adhesiveness, durability and weather resistance of the mortar cured body are good, but the feedability and the stretchability of the mortar are reduced. As a result, workability may deteriorate. From these things, it is preferable that the average particle diameter of the primary particle of the resin component contained in the hydraulic composition of this invention is the said range.

  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 0.15-0.9 μm particles, more preferably 90% by mass or more of 0.2-0.8 μm particles, and particularly preferably 0.3-0.7 μm particles. Can be selected and used. Due to the particle size distribution of such primary particles, good workability when using the hydraulic composition of the present invention, and excellent adhesion, durability and weather resistance obtained by forming a dense polymer film, Is preferable because it is obtained together.

  When primary particles having a particle size in the above range are included in the above mass ratio range, in the case of hydraulic mortar using an acrylic copolymer-based re-emulsifying resin powder, the surface of the mortar is smoothed using a plasterer etc. In addition, it is possible to obtain good wrinkling characteristics (cutting property, wrinkle feeding property, wrinkle stretchability, wrinkle release property).

  When the particle size of the primary particles of the resin component tends to be larger than the above distribution range, the workability during mortar construction is good, but the adhesiveness, durability, and weather resistance of the cured mortar May decrease. In addition, when the particle size of the primary particles of the resin component tends to be smaller than the distribution range, the adhesiveness, durability and weather resistance of the mortar cured body are good, but at the time of mortar construction There is a risk that workability will be deteriorated due to deterioration of the wrinkling characteristics. From these things, it is preferable that the particle size of the primary particle of a resin component is the range of the said distribution.

  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 resin powdering) 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-emulsification type comprising primary particles having a particle size in the above range within the above mass ratio, and the surfaces of the primary particles being coated with a water-soluble protective colloid of polyvinyl alcohol. By selecting and using the resin powder, it is possible to obtain excellent workability at the time of mortar construction, and it is possible to obtain characteristics excellent in adhesion, weather resistance, water resistance and alkali resistance in the mortar cured body.

  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, still more preferably 45 to 85 μm. And particularly preferably in the range of 50 to 80 μm. When the particle size of the secondary particles of the re-emulsifying resin powder is within such a range, the re-emulsifying resin powder is in the process of kneading the hydraulic composition containing the re-emulsifying resin powder and water into a mortar. These secondary particles are easily crushed by other particles contained in the hydraulic composition and easily redispersed, and the primary particles tend to be uniformly dispersed. Therefore, it is preferable to use a re-emulsifying resin powder having a secondary particle diameter in the above range.

  When the secondary particle diameter of the re-emulsifying resin powder is larger than the above range, it is difficult to re-disperse in the process of mortarization, and the primary particles are hardly uniformly dispersed. It is preferable. In addition, when the secondary particle size of the re-emulsifying resin powder is smaller than the above range, the re-emulsifying resin powder is scattered when the hydraulic composition is produced by premixing at the factory, and the working environment is deteriorated. In this case, the lower limit of the above range is preferable.

  The re-emulsifying resin powder used in the present invention is preferably 1 to 20 parts by weight, more preferably 2 to 15 parts by weight, still more preferably 3 to 12 parts by weight, particularly preferably 100 parts by weight of the hydraulic component. Can be obtained in a range of 5 to 8 parts by mass to obtain a hydraulic composition having both good workability and highly durable cured product characteristics.

  When the blending ratio of the re-emulsification type resin powder is larger than the above range, the viscosity of the mortar obtained by adding water to the hydraulic composition increases, the workability and dredging workability decrease, And bubble marks tend to occur, and the compressive strength of the cured body tends to decrease. Moreover, when a mixture ratio is smaller than the said range, the crack inhibitory effect by the elasticity improvement of a mortar hardening body will become small, and the surface finish of a mortar hardening body tends to worsen. Therefore, the blending ratio of the re-emulsifying resin powder used in the present invention is preferably in the range of 1 to 20 parts by mass.

  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 predetermined particle size configuration.

  As the fine aggregate, known fine sand such as silica sand, river sand, sea sand, mountain sand and crushed sand generally used as fine aggregate, fine aggregate such as waste FCC catalyst, quartz powder and alumina cement clinker, At least one of fine aggregates such as blast furnace slag fine powder, fly ash, silica fume, limestone fine powder (calcium carbonate fine powder) and dolomite fine powder 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 it satisfies a predetermined particle size configuration.

  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.

  The particle size of the fine aggregate is measured using several sieves having different nominal dimensions as defined in JIS Z 8801.

  The particle size distribution of the fine aggregates preferably does not include coarse particles having a particle diameter of 2500 μm or more. In such a particle size distribution, good flow characteristics and material separation resistance of mortar can be obtained, and smooth and excellent surface finish can be stably obtained.

  The hydraulic composition of the present invention is repaired and smoothed by repairing defects and irregularities in the surface layer of structures such as buildings, filling in recesses and repairing smoothly, or filling in gaps and cracks The main purpose is to repair such as doing. In particular, when it is important to finish the boundary portion between the surface layer and the repair portion of the structure as smoothly as possible, the fine aggregate does not contain particles having a particle size larger than 150 μm, that is, the particle size is 150 μm. It is preferable to use a fine aggregate composed only of the following particles.

  As shown in FIG. 1, “grinding” means that when there is a step 14 on the surface of the base, a hydraulic mortar is applied using a scissors or the like, and a gentle slope is applied from the bottom to the top of the step 14. In the process of flattening by removing the step, the hydraulic mortar is continuously thinned, especially in the part where the wrinkles touch the lower surface of the step so that the hydraulic mortar forms an extremely thin layer That means. The surface of the cured body of the hydraulic mortar that has been “rubbed” and the lower surface of the step are as if they were integrated. As a result, the hydraulic mortar cured body 21a having a shape as schematically shown in FIG. 1 can be formed. In addition, “grinding finish” means a surface finish constructed by “grinding”. Even when the step is convex (projection 15 as shown in FIG. 2), that is, when there are steps on both sides, the surface is flattened by applying a finishing finish to both steps, and the water as shown in FIG. The hard mortar cured body 21a can be formed. The level difference that can be flattened by rubbing is, for example, a level difference of about 20 mm or less. The process of applying a finish by glazing is called “glazing and laying construction”.

  Since the hydraulic composition contains fine aggregate, when rubbed and rubbed, coarse particles in the fine aggregate are smooth finished parts at the boundary between the base surface and the repaired part. May not be able to form a good finished surface. Therefore, when using the hydraulic composition of this invention for such a use, it is preferable to use the fine aggregate of only the particle | grains whose particle diameter is 150 micrometers or less for the hydraulic composition of this invention.

  Moreover, it is preferable that lightweight composition, such as a pearlite and a foam aggregate, is not contained in the hydraulic composition of this invention. When lightweight aggregates such as pearlite are used in the hydraulic composition of the present invention, the glazing workability may be further improved, but the hardened mortar hardened body is difficult to obtain high strength characteristics and is used for a long time. This is not preferable because it tends to be poor in durability at the time.

  The hydraulic composition of the present invention includes a hydraulic component including alumina cement, an acrylic copolymer-based re-emulsifying resin powder, further includes a fine aggregate, and a setting modifier (setting retarder and / or setting). It is preferable that it contains at least one component selected from accelerators and thickeners and does not contain a fluidizing agent. Further, 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, further includes a fine aggregate, and a setting modifier ( It is preferable that it contains at least one component selected from a setting retarder and / or a setting accelerator) and a thickener and does not contain a fluidizing agent.

  In the case of carrying out a laminating construction using the hydraulic composition of the present invention, in the case of constructing a hydraulic mortar, particles having a particle diameter of 150 μm or less are required in order to obtain a good glazing workability and a laminating workability. Use only fine aggregate. That is, when carrying out the laminating construction, particles having a particle diameter larger than 150 μm can be suitably applied to the laminating construction for smooth finishing of the uneven portion of the construction surface by the glazing operation using hydraulic mortar. It is preferable to use a hydraulic composition that does not contain, that is, contains a fine aggregate containing only particles having a particle diameter of 150 μm or less.

  In the case of carrying out the grinding construction, the hydraulic composition of the present invention includes at least one fine bone selected from blast furnace slag fine powder, fly ash, silica fume, limestone fine powder (calcium carbonate fine powder) and dolomite fine powder. It is preferable to include a material having a particle diameter of 150 μm or less, and in particular, by including fine limestone powder, it is possible to obtain good glazing workability. In the case of forming a (reduced portion), it is preferable because a smoothed portion can be formed smoothly. In addition, when limestone fine powder is used as a fine aggregate having a particle size of 150 μm or less, the shape retention of the hydraulic mortar that has been applied by crease is increased, and the effect of preventing dripping of the hydraulic mortar can be enhanced.

  When carrying out the laminating construction using the hydraulic composition of the present invention, the amount of fine aggregate having a particle size of 150 μm or less is preferably 150 to 350 parts by mass, more preferably 100 parts by mass of the hydraulic component. It is preferable to set it as 180-300 mass parts, More preferably, it is 200-270 mass parts, Most preferably, it is 210-250 mass parts.

  In the hydraulic composition of the present invention, the amount of fine limestone powder added is preferably 150 to 350 parts by mass, more preferably 180 to 300 parts by mass, and still more preferably 200 to 270 parts by mass with respect to 100 parts by mass of the hydraulic component. Parts, particularly preferably 210 to 250 parts by mass. If the amount of fine limestone powder added is too small, the characteristics of the mortar coating may deteriorate when the hydraulic mortar is applied, and if too much, the fluidity of the hydraulic mortar suitable for the mortar application is obtained. The amount of water increases, and long-term strength may be reduced.

The limestone fine powder added to the hydraulic composition of the present invention is not particularly limited, and a commercially available product can be used. As the fineness (brane specific surface area) of the fine limestone powder, a powder having a fine particle size of 3,000 to 5,000 cm ² / g can be suitably used. When the specific surface area of the brain is 3,000 cm ² / g or more, it is preferable because the effect of improving the shape retention of the hydraulic mortar subjected to the glazing operation is sufficient, and the hydraulic property is 5,000 cm ² / g or less. This is preferable because the tendency of the viscosity of the mortar to become remarkable and the problem of hindering the wrinkling workability does not occur.

  In the hydraulic composition of the present invention, a fluidizing agent (or water reducing agent) used for improving the fluidity of hydraulic mortar is not used. Generally, by using a fluidizing agent, good fluidity can be obtained with a small amount of water when preparing hydraulic mortar, but hydraulic mortar is applied to the surface layer of structures such as buildings. When it is installed, a layered hydraulic mortar construction part is formed, or when a defect or recess in the surface layer part of a structure is filled and repaired with hydraulic mortar, sagging occurs due to its fluidity and smooth construction The surface may not be retained. In FIG. 3, the hydraulic mortar cured body 33 which is a repair portion using a hydraulic composition having good shape retention, and a repair portion using a repair material in which sag of the mortar occurs and shape retention is poor. A certain hydraulic mortar hardening body 34 is illustrated. In the hydraulic composition of the present invention, by not using a fluidizing agent (or water reducing agent), a layered hydraulic mortar construction part is formed on the surface layer part of a structure such as a building by glazing construction, Even when repairing by filling hydraulic mortar in the defects or recesses of the surface layer portion, the shape retention of the constructed hydraulic mortar can be improved. In particular, among the hydraulic compositions of the present invention, when the construction is performed using a hydraulic composition containing a fine aggregate having a predetermined particle diameter, the finish of the boundary portion between the base portion and the hydraulic mortar is finished. Can be increased.

  The setting modifier (setting retarder and setting accelerator) can be appropriately added in a range that does not impair the characteristics, depending on the hydraulic component used and the constituent components of the hydraulic composition. By properly selecting the components of the setting retarder, or the components of the setting retarder and the setting accelerator, the addition amount, and the mixing ratio, the pot life, quick hardening and quick drying of the hydraulic composition can be adjusted. It is preferable because use as a hydraulic composition becomes very easy. In the hydraulic composition of the present invention, by using only a setting retarder as a setting adjusting agent, it is possible to moderately develop an appropriate fast hardening property 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, sodium malate, sodium citrate, and sodium gluconate, and inorganic sodium salts such as sodium sulfate and sodium bicarbonate. Alternatively, two or more components can be used in combination.

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

  When 1 type or 2 or more types of setting retarders are used, the addition amount of each setting retarder is preferably 0.01 to 2.0 parts by mass, more preferably 100 parts by mass of the hydraulic component. 0.1 to 1.5 parts by mass, more preferably 0.2 to 1.0 parts by mass, and particularly preferably 0.25 to 0.5 parts by mass can be used to obtain suitable fluidity. It is preferable because the pot life (handling time) can be secured.

  As the setting accelerator, a known component for promoting setting can be used. When using a setting accelerator together with a setting retarder, it is preferable to use, for example, a lithium salt having a suitable setting promoting 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 viewpoint of the setting acceleration effect, availability, and cost.

  When the hydraulic composition of the present invention requires a setting acceleration effect, it is possible to further increase the setting acceleration effect by using a combination of the lithium salt with a setting acceleration component such as aluminum sulfate, potassium sulfate, or sodium aluminate. Therefore, it is more preferable. In particular, when a setting accelerator is used in combination with a setting retarder for the hydraulic composition of the present invention, a higher setting acceleration effect is obtained by using a lithium salt having a preferable setting acceleration effect and aluminum sulfate in combination. be able to.

  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. be able to.

  The thickener can be added in an addition amount within a range not impairing the properties 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.

  In the hydraulic composition of the present invention, in addition to the above components, antifoaming agents such as silicone-based, alcohol-based, polyether-based synthetic materials or mineral oil-based, plant-derived natural materials, organic fibers and inorganic materials A fiber component such as a system fiber and a coloring component such as an organic pigment and an inorganic pigment can be appropriately selected and used.

  In the case of constituting the hydraulic composition of the present invention, 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 predetermined particle size constitution. It contains fine aggregate, thickener and setting modifier (setting retarder or setting retarder and set accelerator).

  In addition, when various pigments are blended in the hydraulic composition of the present invention to obtain a colored hydraulic mortar cured body, particularly suitable component constitution is a hydraulic component composed of white alumina cement, white Portland cement and gypsum, acrylic It contains copolymer re-emulsifying resin powder, fine aggregate, thickener, setting modifier (setting retarder or setting retarder and set accelerator) and pigment. By using the white alumina cement and the white Portland cement, it is easy to control the color tone of the cured hydraulic mortar by adding the pigment, and the color tone of the repaired portion can be easily adjusted to the color tone of the concrete structure to be repaired.

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

  The premix powder of the hydraulic composition of the present invention can be mixed and stirred with a predetermined amount of water to produce a hydraulic mortar. The hydraulic mortar is cured to obtain a cured hydraulic mortar. Obtainable.

  The hydraulic composition of the present invention can be mixed and stirred with water to produce a hydraulic mortar. By adjusting the amount of water added to the hydraulic composition, the fluidity of the hydraulic mortar, pot life, glazing properties, shape retention, strength of the cured hydraulic mortar, and the like can be adjusted.

  The hydraulic mortar using the hydraulic composition of the present invention has a mass ratio (W / S) of the hydraulic composition (S) and water (W), preferably in the range of 0.13 to 0.45, More preferably, it is blended and kneaded so as to be in the range of 0.14 to 0.40, more preferably in the range of 0.15 to 0.35, and particularly preferably in the range of 0.16 to 0.32. preferable.

  The hydraulic composition used in the present invention has a 15-stroke flow value of JIS R 5201 (flow test of physical test method for cement) of a hydraulic mortar immediately after kneading prepared by mixing with water, preferably 100 to 270 mm. More preferably, it is adjusted to 120 to 240 mm, particularly preferably 150 to 220 mm. This is because it is possible to obtain good glazing workability and good shape retention after construction, and it is easy to obtain a cured mortar surface having a good finish without sagging. Moreover, when using the thing containing the fine aggregate of a predetermined | prescribed particle diameter among the hydraulic compositions of this invention, the outstanding construction workability can be obtained by having 15 flow values of the said range. .

  Further, the hydraulic composition used in the present invention preferably has a 15-stroke flow value of JIS R 5201 (flow test of physical test method for cement) of a hydraulic mortar that has been prepared by mixing with water and 60 minutes have passed. Is preferably adjusted to 100 to 270 mm, more preferably 120 to 240 mm, and particularly preferably 150 to 220 mm. After preparing the hydraulic mortar, while ensuring sufficient pot life (handling time), good lacquering workability and good shape retention after construction can be obtained, and the finished hydraulic property with no sagging This is because the surface of the mortar cured body can be easily obtained. Moreover, when using the thing containing the fine aggregate of a predetermined | prescribed particle diameter among the hydraulic compositions of this invention, the outstanding construction workability can be obtained by having 15 flow values of the said range. .

  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, 55 to 85 mm, preferably 58 It is preferable that the thickness is adjusted to ˜83 mm, more preferably 60 to 80 mm, because the ease of construction and proper glazing workability are obtained, and a mortar construction body without sagging is easily obtained. If the flow value exceeds 85 mm, when hydraulic mortar is applied to the surface layer portion of the structure, good shape retention may not be obtained and the mortar construction may be sag. Is preferably 85 mm or less.

  The construction thickness when the hydraulic mortar is applied to the surface layer of a structure such as concrete varies depending on the unevenness of the surface layer (construction surface), and the appropriate thickness should be set for each construction site. Can do. Specifically, on the basis of the uppermost convex part upper surface of the surface layer part (construction surface), the construction thickness is preferably in the range of 0.1 mm to 50 mm, more preferably in the range of the construction thickness of 0.11 mm to 40 mm, further preferably. Is preferably applied in the range of 0.12 mm to 30 mm, particularly preferably in the range of 0.15 mm to 20 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.

  In addition, the working depth when filling and filling hydraulic mortar to the concaves and cracks of the surface layer of structures such as concrete is not particularly limited, and the appropriate application depth for each construction site Can be set. For example, on the basis of the surface layer portion (construction surface), the construction depth is preferably 50 mm or less, more preferably construction depth 40 mm or less, further preferably construction depth 30 mm or less, particularly preferably construction depth 20 mm or less. It is preferable to apply a varnish to the surface. In particular, the hydraulic composition of the present invention can obtain suitable workability and good surface finish by performing the glazing operation in the above-mentioned preferable range of the construction depth.

  The hydraulic composition of the present invention is used as a hydraulic composition for applying a hydraulic mortar prepared by kneading a hydraulic composition and water to a surface layer portion of a structure using a scissors. It is preferable. Further, the hydraulic composition of the present invention has a fine aggregate having a predetermined particle diameter, and thus can be used as a hydraulic composition for applying and rubbing a surface layer portion of a structure using a ridge. .

  In this specification, the part which applied and hardened the hydraulic mortar containing the hydraulic composition of this invention to the surface layer part of a structure is called "mortar hardening body." The mortar cured body can be applied to at least a part of the surface layer portion of the structure. In addition, as described above, not only filling and filling the recesses and cracks in the surface layer portion of the structure, but it is also possible to provide a mortar cured body in layers over the other surface layer portions. When obtaining the structure which has a mortar hardening body using the hydraulic composition of this invention, suitable workability | operativity and favorable surface finish can be obtained.

  The hydraulic mortar using the hydraulic composition of the present invention has sufficient pot life (handling time) to ensure good workability. The pot life of the hydraulic mortar is preferably 60 minutes from the preparation of the hydraulic mortar, more preferably 90 minutes, and particularly preferably 120 minutes. The hydraulic mortar using the hydraulic composition of the present invention has the above-mentioned preferable pot life (handling time) and stably has a good wrinkle coating workability (cutting, wrinkle feeding, wrinkle elongation, wrinkle separation). Obtainable.

  The hydraulic mortar using the hydraulic composition of the present invention starts curing within 0.5 to 2 hours after the completion of construction, depending on the temperature and humidity conditions at the construction site, and with the progress of curing. As a result, the surface hardness of the cured body increases and the moisture content on the surface of the cured body decreases. The shore hardness of the surface of the cured hydraulic mortar is preferably 5 or more after 6 hours, more preferably 5.5 or more after 6 hours, more preferably 6 hours after placing the hydraulic mortar and finishing the surface of the mortar. The hydraulic composition of the present invention has a shore hardness of 5 or more after 5 hours, particularly preferably 2 or more after 4 hours, and after the mortar construction (placement and finishing) is completed, the curing proceeds rapidly. It is possible to form a concrete structure having a hardened mortar body in a short time.

Bending strength of the hydraulic composition used was hydraulic mortar cured body of the present invention, in mortar cured body at the age of 7 days, preferably from 2N / mm ² or more, more preferably 2.5 N / mm ² or more, especially Preferably, a bending strength of 3 N / mm ² or more is expressed.

Moreover, the compressive strength of the hydraulic mortar cured body using the hydraulic composition of the present invention is preferably 5 N / mm ² or more, more preferably 6 N / mm ² or more, particularly in a 7-day mortar cured body. Preferably, a compressive strength of 10 N / mm ² or more is expressed.

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

  The change in the length of the cured hydraulic mortar is a mortar cured product with a material age of 7 days, preferably 0 to -0.07%, more preferably 0 to -0.06%, still more preferably 0 to -0.0. 05%, particularly preferably in the range of 0 to -0.04%, in a mortar hardened body with an age of 28 days, preferably 0 to -0.07%, more preferably 0 to -0.06%, Preferably it is 0 to -0.05%, Especially preferably, it is 0 to -0.04% of range. The hydraulic composition that provides the above-mentioned characteristics of change in length can prevent the occurrence of cracks in the cured body itself, and can maintain a high adhesive force with the base, and obtain a structure having excellent durability after repair. Is preferable. In addition, when the range of the length change is out of the range, it is not preferable because a crack may be generated due to curing shrinkage of the mortar cured body or an adhesive surface between the mortar cured body and the base may be peeled off.

  The hydraulic mortar prepared by mixing the hydraulic composition of the present invention and water should be applied to the surface layer of structures such as floors, walls and ceilings of various buildings using plasterers etc. Can do. 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.

  The hydraulic composition of the present invention is a hydraulic composition containing a hydraulic component containing an alumina cement excellent in quick hardening and quick drying and a resin component. The hydraulic mortar obtained by kneading the hydraulic composition of the present invention and water has a long handling property (usable time) and a good potting workability, while a predetermined working time has elapsed. Thereafter, the curing proceeds promptly, and a mortar cured body having good early strength development and excellent dimensional stability can be obtained. By using the hydraulic composition of the present invention, it is possible to further improve the workability of plasterers, enable mortar construction in a short construction period, and provide a cured mortar body excellent in durability and weather resistance.

  In addition, since the hydraulic composition of the present invention has the above properties, it can also be used as a putty material for repairing cracks and dents on walls and the like, and as a putty material for repairing defects such as corners of walls and pillars. It can be preferably used.

  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) 15 stroke flow value (mm):
The 15-stroke flow value was measured for the kneaded hydraulic mortar immediately after kneading, after 30 minutes of kneading, and after 60 minutes of kneading, according to the flow test of the physical test method of JIS R 5201 cement.

2) SL flow value (mm):
The SL flow value was measured for the kneaded hydraulic mortar according to the method described in JASS 15M-103.

3) Painting workability: The paintworking workability [1] was performed as the paintworking workability [1] to [3] as described below.

3-1) Evaluation of wrinkle coating workability [1] Under conditions of room temperature of 20 ° C. and relative humidity of 65%, mortar is added to a concrete plate of 300 mm × 300 mm × 60 mm specified in a concrete plate for pavement JIS A 5304. The coating was applied at a thickness of 5 mm, and the mortar feed, elongation, breakage, and separation of the mortar at the time of the glazing operation were evaluated immediately after preparing the hydraulic mortar, 30 minutes, and 60 minutes later (spreading operation) Sex [1]). Evaluation was performed as follows. The results are shown in Table 2. Three numbers in a predetermined column of Table 2 indicate evaluations from the left, immediately after kneading, after 30 minutes, and after 60 minutes.
(I) Evaluation of fraying (remaining wrinkles) The evaluation is performed in five stages: 4: very good, 3: good, 2: no practical problem, 1: practical problem, 0: impractical.
(Ii) Evaluation of wrinkle feed (weight) It was performed in five stages: 4: very good, 3: good, 2: no practical problem, 1: practical problem, 0: impractical.
(Iii) Evaluation of wrinkle elongation (coating area) 4: Very good, 3: Good, 2: No practical problem, 1: Practical problem, 0: Not practical
(Iv) Evaluation of wrinkle separation (ease of finishing the coated surface) 4: Very good, 3: Good, 2: No problem in practical use, 1: Problem in practical use, 0: Not practical.

3-2) Evaluation of wrinkle coating workability [2]: Evaluation of “grindability” (formation of grinded portion) After applying mortar to the surface of a concrete flat plate with a thickness of about 1 mm, use a plasterer to grind the grinded portion. It formed and evaluated about the smearing | coating process property (coating workability [2]). Evaluation was performed in three stages as follows.
○: Good, Δ: Practical problem, ×: Impractical.

3-3) Evaluation of lacquering workability [3]: Evaluation of “shape retention” (shape retention of the finished surface: deformation due to sagging) As an evaluation of shape retention, it is applied to the step portion of a concrete flat plate formed with a 3 mm step. After applying a mortar to form a smooth finished surface, 60 minutes later, it was evaluated whether the smooth finished surface was maintained (spreading workability [3]). Evaluation was performed in three stages as follows.
○: Good, Δ: Practical problem, ×: Impractical.

4) Shore hardness of the cured body surface:
Using a spring type hardness tester type D type (manufactured by Ueshima Seisakusho Co., Ltd.), the hardness of the hardened surface of the hydraulic mortar is measured at an arbitrary 3 to 5 locations in a predetermined elapsed time after the placement of the hydraulic mortar. The surface hardness was measured, and the average value of the reading values of the spring type hardness tester type D gauge was defined as the surface hardness at that time.

5) Bending strength (N / mm ² ) and compressive strength (N / mm ² ):
The size of the test body used in the test for measuring the bending strength and compressive strength of the cured hydraulic mortar was a square column test body (4 cm × 4 cm × 16 cm) having a cross section of 40 mm square and a length of 160 mm. In accordance with JIS R 5201, the bending strength and compressive strength of material age 1 day, material age 7 days and material age 28 days were measured.

6) Evaluation of adhesive strength:
The adhesion strength of the cured hydraulic mortar was measured according to the adhesion strength test method of JIS A 6916. A hydraulic mortar was applied in a thickness of about 3 to 5 mm on a 300 mm × 300 mm × 60 mm concrete plate defined in a JIS A 5304 pavement concrete plate to provide a layered hydraulic mortar cured body. A square steel jig having an attachment surface of 40 mm × 40 mm was adhered to five places of the hardened hydraulic mortar after 7 days of age and 28 days of age with an adhesive. After the adhesive has hardened, cut with a diamond cutter etc. until it reaches the concrete flat plate along the circumference of the steel jig, attach the steel jig to the Kenken-type adhesion tester, gradually apply a tensile load, and break Pressurization was performed until The maximum load until breakage was evaluated as the maximum tensile load, and the average value at 5 locations was evaluated as the adhesive strength.

7) Length change:
About the measurement test of the length change of a hydraulic mortar hardened | cured material, it carried out according to the contact gauge method prescribed | regulated to JISA1129-1.

(Materials used):
The hydraulic composition was prepared using the following materials. That is, the hydraulic composition which mixed the following raw material with the mixture ratio shown in Table 1 or Table 2 was used.
Alumina cement A: Fondue, manufactured by Kerneos, Blaine specific surface area 3100 cm ² / g.
Alumina cement B: Turnal white (white alumina cement), manufactured by Kerneos, Blaine specific surface area 4100 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: White cement, Taiheiyo Cement.
Gypsum: Type ^II anhydrous gypsum, manufactured by Central Glass Co., Ltd., Blaine specific surface area of 3460 cm ² / g.
Resin component: A copolymer of acrylic ester / methacrylic ester, re-emulsifying resin powder in which primary particles are coated with a water-soluble protective colloid of polyvinyl alcohol, DM7100P, manufactured by Nichigo Mobile.
-Inorganic fine powder: Limestone fine powder (calcium carbonate fine powder), manufactured by Arihei Mining Co., Ltd., TM-1, No. Blaine specific surface area 4830 cm ² / g, 100 mesh sieve (mesh opening = 150 μm).
-Fine aggregate A: No. 6 silica sand, manufactured by Ube Sand Co., Ltd. (The particle size distribution is shown in Table 3.)
-Fine aggregate B: No. 5 silica sand, manufactured by Ube Sand Co., Ltd. (The particle size distribution is shown in Table 3.)
-Setting retarder A: L-sodium tartrate, manufactured by Fuso Chemical Industries.
-Setting retarder B: sodium bicarbonate, manufactured by Tosoh Corporation.
-Thickener: ME250T, manufactured by Matsumoto Yushi Co., Ltd.
-Fluidizer: Polycarboxylic acid fluidizer, manufactured by Kao Corporation.

(Preparation of mortar for hydraulic composition)
A hydraulic composition is prepared at a blending ratio shown in Table 1, a predetermined amount of water shown in Table 1 is blended with 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 to 4, Comparative Examples 1 to 4]
A hydraulic mortar was prepared using a hydraulic composition containing the components shown in Table 1. Table 2 shows the results of evaluation of properties such as fluidity of mortar, glazing workability and curing characteristics.

(1) In the case of Comparative Example 1 using only early strength Portland cement as the hydraulic component and using fine aggregate, the shape retention of the hydraulic mortar was good, but the length change of the cured hydraulic mortar However, since it showed a large value of -0.08% at the age of 7 days and -0.10% at the age of 28 days and was inferior in dimensional stability, it can be said that there is a large risk of cracking.
(2) In Comparative Example 2 including a hydraulic component composed of alumina cement, Portland cement and anhydrous gypsum, a fine aggregate, and a fluidizing agent, the mortar showed excellent characteristics in terms of workability. The shape retention was poor.
(3) In the case of Example 1 and Example 2 using a hydraulic component composed of alumina cement, Portland cement and anhydrous gypsum and fine aggregate, and using no fluidizing agent, the dredging workability is good and water The shape retention of the hard mortar is also excellent, and the change in length of the cured hydraulic mortar is in the range of -0.03 to 0% at a material age of 7 days and -0.03 to 0% at a material age of 28 days. The range was stable and showed a small value, and excellent characteristics in dimensional stability.
(4) In the case of Comparative Example 3 in which early strength cement is used as the hydraulic component and fine limestone powder is used without using fine aggregates, good rapid curing cannot be obtained, and the length change of the hydraulic mortar cured body However, it showed a large value of -0.09% at the age of 7 days and -0.16% at the age of 28 days. Since the dimensional stability is inferior, it can be said that there is a great risk of cracking.
(5) In the case of Comparative Example 4 using a hydraulic component composed of alumina cement, Portland cement and anhydrous gypsum, and fine limestone powder without using fine aggregates and containing a fluidizing agent, the shape retention of the hydraulic mortar is It was bad.
(6) In the case of Example 3 to Example 4 using a hydraulic component composed of alumina cement, Portland cement and anhydrous gypsum, and limestone fine powder not containing particles having a particle diameter exceeding 150 μm, and using no fluidizing agent, It showed excellent properties in terms of quick-curing property, dredging workability, and laminating workability, and the shape retention of hydraulic mortar was also good. Furthermore, the change in the length of the cured hydraulic mortar body shows a stable and small value in the range of -0.04 to 0% at the age of 7 days and in the range of -0.04 to 0% at the age of 28 days. It showed excellent characteristics in dimensional stability.

It is an example of construction of the hydraulic composition of the present invention, and is a partial cross-sectional view schematically showing a case where the hydraulic composition is rubbed into a step. It is an example of construction of the hydraulic composition of the present invention, and is a partial cross-sectional view schematically showing a case where the hydraulic composition is rubbed onto a convex part. It is a figure which shows typically an example of repair construction using the hydraulic composition with favorable shape retention of this invention, and an example of repair construction using the repair material with poor shape retention.

Explanation of symbols

10 Floor level 11 Structure 14 Step 15 Convex 21a Hydraulic mortar hardened body (finishing finish)
31 Structure 32 Deficient part 33 Hydraulic mortar hardened body (Repair part using hydraulic composition with good shape retention)
34 Hardened hydraulic mortar (Repair part using repair material with poor shape retention / sag of mortar occurs)

Claims (8)

  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 characterized by having a flow value measured by a flow test in accordance with JASS 15M-103 for a hard mortar of 55 to 85 mm.   The hydraulic composition according to claim 1, wherein the hydraulic component comprises alumina cement, Portland cement and gypsum.   The resin component is a re-emulsifying resin powder, the average particle size of the primary particles of the re-emulsifying resin powder is 0.2 to 0.8 μm, and the primary particle surface of the re-emulsifying resin powder is water-soluble polyvinyl alcohol. The hydraulic composition according to claim 1 or 2, which is an acrylic copolymer re-emulsifying resin powder coated with a protective protective colloid.   The hydraulic composition according to any one of claims 1 to 3, wherein the hydraulic composition does not include a lightweight aggregate.   The hydraulic composition according to any one of claims 1 to 4, wherein the hydraulic composition further comprises at least one component selected from a setting modifier and a thickener.   The change in length of the cured hydraulic mortar obtained by curing the hydraulic mortar prepared by kneading the hydraulic composition and water is in the range of 0 to -0.07% at 7 days of age. The hydraulic composition according to any one of claims 1 to 5, which is in the range of 0 to -0.07% at the age of 28 days.   The hydraulic composition is a hydraulic composition for applying a hydraulic mortar prepared by kneading the hydraulic composition and water to the surface layer portion of the structure using a scissors. The hydraulic composition of any one of 1-6.   The structure which has the hydraulic mortar hardening body which hardened the hydraulic mortar obtained using the hydraulic composition of any one of Claims 1-7 in at least one part of the surface layer part of a structure.