Spraying device of hydraulic composition
Patent Information
- Application Number
- JP2022178147
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2022-11-07
- Publication Date
- 2025-10-23
Smart Images
Figure 00000000_0000_ABST
Abstract
Description
[Technical field]
[0001] The present invention relates to a hydraulic composition spraying device, a hydraulic composition spraying method, a hydraulic composition evaluation device, and a hydraulic composition evaluation method. [Background technology]
[0002] In order to prevent the collapse of exposed ground such as during tunnel excavation, a spraying method using quick-setting concrete, which is made by mixing an accelerator with concrete, is being used. Among these methods, the wet spraying method is usually carried out by preparing the sprayed concrete in a cement, aggregate, and water metered mixing plant installed at the excavation site, and transporting it to a transport / spraying machine with an agitator truck. Then, this sprayed concrete and the powdered accelerator are joined and mixed in a line that pneumatically pumps the sprayed concrete to the discharge outlet of the spraying machine with a pump, and a line that pneumatically pumps the powdered accelerator from the other side through a junction pipe installed midway, and the quick-setting shotcrete is sprayed onto the ground surface until it reaches a specified thickness.
[0003] Patent Document 1 discloses a spraying device for transporting a main material, which is mortar or concrete, comprising a stirring and mixing container having a discharge outlet capable of discharging the main material stirred by a stirring means, a transport pipe having a base end connected to the discharge outlet, and an ejector attached to the transport pipe, which uses compressed air to suck the main material from the discharge outlet and transport it to the tip side of the transport pipe. Patent Document 2 discloses a slump-reducing spray admixture containing a clay mineral and an alkali metal aluminate and / or aluminum hydroxide, and a spraying method in which the slump-reducing spray admixture and cement concrete pneumatically conveyed through a pipe are mixed together immediately before spraying onto a construction site, and then sprayed. Patent Document 3 discloses a spraying material containing lithium bentonite, and a wet spraying method in which concrete made by mixing a hydraulic composition with water is pneumatically pumped, and an accelerator is added and mixed, and then sprayed. [Prior art documents] [Patent documents]
[0004] [Patent Document 1] Japanese Patent Application Publication No. 11-276940 [Patent Document 2] JP 2002-029799 A [Patent Document 3] JP 2001-206749 A Summary of the Invention [Problem to be solved by the invention]
[0005] In the spraying method in which a sprayable hydraulic composition is sprayed onto a target surface, a part of the sprayed hydraulic composition does not adhere to the target and is discarded, which is economically and environmentally undesirable. In addition, from the viewpoint of reducing material loss and improving productivity, it is desired to prevent dripping of the sprayed hydraulic composition from the sprayed surface immediately after spraying. Moreover, from the viewpoints of improving work efficiency and economy, there is a demand for a spraying device capable of continuously spraying a hydraulic composition using as few facilities as possible. The present invention provides a hydraulic composition spraying device, a hydraulic composition spraying method, an evaluation device and an evaluation method for a hydraulic composition, which are simple and provide high adhesion of the hydraulic composition sprayed onto a target surface. [Means for solving the problem]
[0006] The present invention relates to a hydraulic composition spraying device for spraying a hydraulic composition onto a target surface, the device comprising: a cylindrical main body having a suction port for sucking in the hydraulic composition and a discharge nozzle from which the hydraulic composition sucked in from the suction port is discharged; and an input section provided on the side of the main body for supplying compressed air flowing from the inner surface of the main body toward the discharge nozzle into the inside of the main body, wherein the ratio L / d of the distance L between the tip of the discharge nozzle and the end of an opening formed in the inner wall of the main body through which the compressed air from the input section flows, to the inner diameter d of an opening at the tip of the discharge nozzle, is 1.5 or more and 5.0 or less.
[0007] The present invention also relates to a method for spraying a hydraulic composition, which comprises spraying a hydraulic composition containing hydraulic powder and water onto a target surface with the hydraulic composition spraying device.
[0008] The present invention also relates to an evaluation device for a hydraulic composition, comprising a spraying device for the hydraulic composition, and a sprayed member that is provided opposite the discharge nozzle of the spraying device and onto which the hydraulic composition is sprayed from the spraying device.
[0009] The present invention also relates to a method for evaluating a hydraulic composition, which comprises spraying the hydraulic composition to be evaluated onto a member to be sprayed using the hydraulic composition spraying device. Effect of the Invention
[0010] According to the present invention, there are provided a hydraulic composition spraying device, a hydraulic composition spraying method, a hydraulic composition evaluation device, and a hydraulic composition evaluation method, which are simple and provide high adhesion of the hydraulic composition sprayed onto a target surface. [Brief description of the drawings]
[0011] [Figure 1] FIG. 2 is a cross-sectional view showing a main part of a hydraulic composition spraying device according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a schematic diagram showing an overview of an evaluation device for a hydraulic composition according to an embodiment of the present invention. [Diagram 3] FIG. 1 is a schematic diagram showing an overview of an evaluation device A according to an embodiment of the present invention. [Figure 4] FIG. 2 is a schematic diagram showing an overview of an evaluation device B according to a comparative example of the present invention. [Diagram 5] FIG. 2 is a schematic diagram showing an overview of an evaluation device C according to a comparative example of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0012] The mechanism by which the hydraulic composition spraying device of the present invention improves the adhesive strength of the hydraulic composition sprayed onto a target surface is not clear, but is presumed to be as follows. It is presumed that the hydraulic composition spraying device of the present invention creates negative pressure inside the main body, sucks in the hydraulic composition while loosening it and spraying it, thereby improving the compaction of the hydraulic composition and suppressing sagging. Furthermore, the hydraulic composition spraying device of the present invention prevents the hydraulic composition from remaining in the spraying device by shortening the length of the discharge nozzle relative to the inner diameter of the opening at the tip of the discharge nozzle provided in the spraying device, improving the compaction properties of the hydraulic composition, and it is presumed that this further improves the adhesion of the hydraulic composition sprayed onto the target surface. The hydraulic composition spraying device, hydraulic composition spraying method, hydraulic composition evaluation device and hydraulic composition evaluation method of the present invention are not limited to the above-mentioned mechanism of action.
[0013] <Spraying device for hydraulic composition> As shown in Fig. 1, a hydraulic composition spraying device 1 according to an embodiment of the present invention comprises a cylindrical main body 2 having a suction port 2a for sucking in the hydraulic composition and a discharge nozzle 2b for discharging the hydraulic composition sucked from the suction port 2a, and an input unit 3 provided on the side of the main body 2 for supplying compressed air flowing from the inner surface of the main body 2 toward the discharge nozzle 2b into the inside of the main body 2. In the figure, a cylindrical member formed integrally with the main body 2 is shown as the discharge nozzle 2b, but the discharge nozzle 2b can be provided with a detachable extension nozzle (not shown).
[0014] A reservoir for storing the hydraulic composition is connected to the suction port 2a via a conveying pipe (not shown). An air compressor (not shown) is connected to the input unit 3. Compressed air supplied from the air compressor is supplied from the input unit 3 to the inside of the main body 2. An opening 2c through which the compressed air flows is formed along the inner circumference of the main body 2 on the inner side wall of the main body 2, and the compressed air supplied from the input unit 3 flows from the inner surface of the main body 2 toward the discharge nozzle 2b through this opening 2c. For example, the main body 2 is a short cylindrical body having a double-pipe structure, and the compressed air supplied from the input unit 3 through the opening 2c into the main body 2 becomes a circular flow from the inner wall surface of the main body 2 toward the discharge nozzle 2b. This flow of compressed air creates a negative pressure inside the main body 2 on the suction port 2a side, and this negative pressure causes the hydraulic composition stored in the storage section to be sucked into the main body 2 through the suction port 2a. The hydraulic composition sucked into the main body 2 is agitated inside the main body 2 by the compressed air, and is sprayed onto the target surface from the opening 2d of the discharge nozzle 2b together with the compressed air.
[0015] In the hydraulic composition spraying device 1 of the present invention, the ratio L / d of the distance L between the tip of the discharge nozzle 2b and the end of the opening 2c to the inner diameter d of the opening at the tip of the discharge nozzle 2b is 1.5 or more, preferably 2.0 or more, more preferably 2.5 or more, and even more preferably 3.0 or more, from the viewpoint of adhesion of the hydraulic composition and dust suppression, and is 5.0 or less, preferably 4.5 or less, more preferably 4.0 or less, and even more preferably 3.6 or less, from the viewpoint of adhesion of the hydraulic composition.
[0016] The inner diameter d of the opening at the tip of the discharge nozzle 2b is preferably 1.0 cm or more, more preferably 1.5 cm or more, and even more preferably 1.8 cm or more from the viewpoint of the adhesion of the hydraulic composition and dust suppression, and is preferably 7.0 cm or less, more preferably 6.0 cm or less, and even more preferably 5.0 cm or less from the viewpoint of the adhesion of the hydraulic composition and dust suppression. The shape of the opening at the tip of the discharge nozzle may be elliptical or polygonal, but is preferably circular. When the shape of the tip of the discharge nozzle is not circular, the diameter at which the length is smallest is taken as the inner diameter d. The distance L between the tip of the discharge nozzle 2b and the end of the opening 2c is preferably 3.0 cm or more, more preferably 4.0 cm or more, and even more preferably 5.0 cm or more, from the viewpoint of adhesion of the hydraulic composition and dust suppression, and is preferably 10.0 cm or less, more preferably 9.0 cm or less, and even more preferably 8.0 cm or less, from the viewpoint of adhesion of the hydraulic composition and dust suppression.
[0017] The pressure of the compressed air supplied from the air compressor to the input section 3 is preferably 0.2 MPa or more, more preferably 0.25 MPa or more, and even more preferably 0.3 MPa or more, from the viewpoint of adhesion of the hydraulic composition and dust suppression, and is preferably 0.9 MPa or less, more preferably 0.7 MPa or less, and even more preferably 0.6 MPa or less, from the viewpoint of adhesion of the hydraulic composition and dust suppression.
[0018] <Hydraulic composition for spraying> Next, the spray hydraulic composition sprayed by the spraying device 1 according to the embodiment of the present invention will be described in detail. In the present invention, the hydraulic composition sprayed onto a target surface is conveniently called the spray hydraulic composition. The sprayable hydraulic composition of the present invention may be a hydraulic composition containing hydraulic powder and water. The sprayable hydraulic composition of the present invention is preferably a composition containing hydraulic powder and water, and further optionally containing one or more selected from a polymer thickener, a clay mineral, and a quick-setting agent.
[0019] The hydraulic powder used in the sprayable hydraulic composition of the present invention is a powder that hardens when mixed with water, and examples thereof include ordinary Portland cement, high-early-strength Portland cement, ultra-high-early-strength Portland cement, sulfate-resistant Portland cement, low-heat Portland cement, moderate-heat Portland cement, white Portland cement, and ecocement (e.g., JIS R5214, etc.). Among these, from the viewpoint of the spread of the sprayable hydraulic composition, cement selected from early-early-strength Portland cement, ordinary Portland cement, sulfate-resistant Portland cement, and white Portland cement is preferred, and early-early-strength Portland cement and ordinary Portland cement are more preferred.
[0020] The hydraulic powder may include blast furnace slag, fly ash, silica fume, anhydrous gypsum, etc., and may also include non-hydraulic limestone fine powder, etc. As the hydraulic powder, blast furnace cement, fly ash cement, or silica fume cement, which is a mixture of cement with blast furnace slag, fly ash, silica fume, etc., may also be used.
[0021] The spray hydraulic composition of the present invention preferably contains aggregate. Examples of the aggregate include aggregates selected from fine aggregates and coarse aggregates. The aggregate preferably contains fine aggregate. Examples of the fine aggregate include those specified by number 2311 in JIS A0203-2014. Examples of the fine aggregate include river sand, land sand, mountain sand, sea sand, lime sand, silica sand and crushed sands thereof, blast furnace slag fine aggregate, ferronickel slag fine aggregate, lightweight fine aggregate (artificial and natural), and recycled fine aggregate. Examples of the coarse aggregate include those specified by number 2312 in JIS A0203-2014. For example, examples of the coarse aggregate include river gravel, land gravel, mountain gravel, sea gravel, lime gravel, crushed stones thereof, blast furnace slag coarse aggregate, ferronickel slag coarse aggregate, lightweight coarse aggregate (artificial and natural), and recycled coarse aggregate. The fine aggregate and the coarse aggregate may be used in a mixture of different types, or a single type may be used. The sprayable hydraulic composition of the present invention preferably contains fine aggregate as an aggregate. The amount of fine aggregate used in the sprayable hydraulic composition of the present invention is preferably 800 kg / m 3 More preferably, 900kg / m 3 More than 1300 kg / m 3 Less than or equal to 1200 kg / m 3 The following is the result. In the sprayable hydraulic composition of the present invention, the fine aggregate ratio is preferably 35% or more, more preferably 45% or more, and preferably 70% or less, more preferably 65% or less. Here, the fine aggregate ratio is the volume content of fine aggregate in the total aggregate.
[0022] The water / hydraulic powder ratio (W / C) of the hydraulic composition for spraying of the present invention is, from the viewpoints of adhesion and strength development of the hydraulic composition, preferably 30 mass % or more, more preferably 40 mass % or more, even more preferably 50 mass % or more, and is preferably 80 mass % or less, more preferably 70 mass % or less, even more preferably 65 mass % or less. That is, from the viewpoint of adhesion and strength development of the hydraulic composition, the hydraulic composition for spraying of the present invention contains water in an amount of preferably 30 parts by mass or more, more preferably 40 parts by mass or more, even more preferably 50 parts by mass or more, and preferably 80 parts by mass or less, more preferably 70 parts by mass or less, even more preferably 65 parts by mass or less, relative to 100 parts by mass of the hydraulic powder. The water / hydraulic powder ratio (W / C) is the mass percentage (mass%) of water to the hydraulic powder in the hydraulic composition for spraying, and is calculated as (water / hydraulic powder)×100. In addition, when the hydraulic powder includes powders selected from powders having pozzolanic action, powders having latent hydraulic properties, and stone powder (calcium carbonate powder) in addition to powders having properties that harden through hydration reactions such as cement, the amounts of these powders are also included in the amount of hydraulic powder in the present invention. In addition, when the powder having properties that harden through hydration reactions contains a high-strength admixture, the amount of the high-strength admixture is also included in the amount of hydraulic powder. This also applies to other parts by mass that are related to the mass of the hydraulic powder.
[0023] <Polymer thickener> The spray hydraulic composition of the present invention may optionally contain a polymer thickener. The polymer thickener may be one or more selected from polyalkylene oxides and polymer compounds having a carboxy group, and from the viewpoint of adhesion of the hydraulic composition, one or more selected from polyalkylene oxides, polyacrylic acid and its salts are preferred, and polyalkylene oxides are more preferred.
[0024] The polyalkylene oxide is preferably at least one selected from, for example, polyethylene oxide, polypropylene oxide, and a copolymer of polyethylene oxide and polypropylene oxide, and from the viewpoint of adhesion of the hydraulic composition, polyethylene oxide is preferable. When the polyalkylene oxide contains different types of alkylene oxide, the bond of the alkylene oxide may be a block bond or a random bond.
[0025] From the viewpoint of adhesion of the hydraulic composition, the weight average molecular weight of the polyalkylene oxide is preferably 200,000 or more, more preferably 400,000 or more, and preferably 10 million or less, more preferably 5 million or less, even more preferably 1.7 million or less, and still more preferably 1.5 million or less.
[0026] The weight average molecular weight of the polyalkylene oxide may be a value based on the product information (catalog, etc.) in the case of a commercially available product. Even if the weight average molecular weight of the polyalkylene oxide is unknown, since the weight average molecular weight of the polyalkylene oxide correlates with the viscosity of the aqueous solution, for example, in the case of polyethylene oxide, the approximate value can be obtained by the following method. <Weight average molecular weight of polyethylene oxide> Prepare aqueous solutions of various concentrations (hereafter referred to as sample aqueous solutions) from the polyethylene oxide to be measured, referring to the standard table below. Measure the viscosity of the sample aqueous solutions using a B-type viscometer at 25°C, No. 2 rotor, 30 rpm, and 1 minute later. However, if the viscosity exceeds 1000 mPa·s when measured with the No. 2 rotor, measure under the same conditions as above (25°C, 30 rpm, and 1 minute later) using the No. 3 rotor. From the viscosity obtained, determine the corresponding weight average molecular weight. Note that this standard table was created using polyethylene oxide with a known weight average molecular weight. In the standard table, PEO stands for polyethylene oxide. JPEG2024067806000002.jpg42153
[0027] The polyalkylene oxide may be in the form of an aqueous solution of the polyalkylene oxide or in the form of a solid. The solid polyalkylene oxide is preferably in the form of particles, more preferably in the form of powder or granules. Granules are generally particles having a relatively larger particle size than powders. The shape of the solid polyalkylene oxide is not limited, and examples of the shape include a sphere, a plate, etc. The shape of the solid polyalkylene oxide may be either regular or irregular.
[0028] Examples of the polymeric compound having a carboxy group include a polymer containing one or more monomers selected from acrylic acid and its salts, acrylic acid esters, methacrylic acid and its salts, methacrylic acid esters, and acrylamide (hereinafter referred to as monomer (A1)), and having a weight average molecular weight of 20,000 to 6,500,000. The polymeric compound having a carboxy group is a polymer containing a structural unit derived from monomer (A1).
[0029] Examples of the salts of acrylic acid and methacrylic acid include sodium salts, potassium salts, ammonium salts, aluminum salts, and calcium salts. Examples of the acrylic acid ester include methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, hexyl acrylate, octyl acrylate, hydroxyethyl acrylate, 2-ethylhexyl acrylate, and glycidyl acrylate. Examples of the methacrylic acid ester include methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, hexyl methacrylate, octyl methacrylate, hydroxyethyl methacrylate, 2-ethylhexyl methacrylate, and glycidyl methacrylate.
[0030] The monomer (A1) is preferably one or more monomers selected from acrylic acid and its salts, methacrylic acid and its salts, and acrylamide, more preferably one or two monomers selected from acrylic acid and its salts, and acrylamide, and even more preferably a monomer of acrylic acid or its salt.
[0031] The polymer compound having a carboxy group may contain a monomer (hereinafter referred to as monomer (A2)) other than the monomer (A1). Examples of the monomer (A2) include unsaturated carboxylic acids such as itaconic acid, maleic acid, fumaric acid, citraconic acid, aconitic acid, and crotonic acid, unsaturated carboxylic anhydrides such as maleic anhydride and citraconic anhydride, unsaturated carboxylic half esters such as monomethyl itaconate, monobutyl itaconate, and monoethyl maleate, unsaturated sulfonic acids such as vinyl sulfonic acid, methallyl sulfonic acid, and 2-(meth)acrylamido-2-methylpropanesulfonic acid, unsaturated phosphoric acids such as 2-((meth)acryloyloxy)ethyl phosphate and bis[2-((meth)acryloyloxy)ethyl] hydrogen phosphate, unsaturated phenols such as vinylphenol, ethylene, acryloyl Examples of the vinyl ester include cyanovinyls such as nitrile and methacrylonitrile, vinyl esters of aliphatic carboxylic acids having 3 to 18 carbon atoms, such as vinyl formate, vinyl acetate, vinyl propionate, vinyl butyrate, vinyl stearate, vinyl octylate, and vinyl neodecanoate, vinyl ether monomers such as methyl vinyl ether, ethyl vinyl ether, butyl vinyl ether, and phenyl vinyl ether, polyfunctional vinyl monomers such as allyl methacrylate, unsaturated hydrocarbons such as styrene and butadiene, and unsaturated amide compounds such as methacrylamide, N-isopropylacrylamide, N-isopropylmethacrylamide, and N-vinylpyrrolidone.
[0032] The proportion of the monomer (A1) in all the monomers constituting the polymer compound having a carboxy group is preferably 60 mol% or more, more preferably 70 mol% or more, even more preferably 80 mol% or more, still more preferably 90 mol% or more, and preferably 100 mol% or less, and may be 100 mol%.
[0033] From the viewpoint of adhesion of the hydraulic composition, the polymer compound having a carboxy group is preferably one or more selected from polyacrylic acid and its salts, polymethacrylic acid and its salts, and polyacrylamide, more preferably one or more selected from polyacrylic acid and its salts, and polyacrylamide, and further preferably polyacrylic acid or its salts. Examples of the salts of polyacrylic acid and polymethacrylic acid include the salts mentioned in the description of the above monomer A1, preferably an alkali metal salt, and more preferably a sodium salt.
[0034] From the viewpoint of adhesion of the hydraulic composition, the weight average molecular weight of the polymer compound having a carboxy group is preferably 20,000 or more, more preferably 50,000 or more, even more preferably 100,000 or more, still more preferably 200,000 or more, and preferably 6.5 million or less, more preferably 5 million or less, still more preferably 3.5 million or less, still more preferably 2.5 million or less, still more preferably 2 million or less. The weight average molecular weight of the polymer compound having a carboxy group is determined by the same method as gel permeation chromatography used to determine the weight average molecular weight of the polymer thickener described below.
[0035] From the viewpoint of adhesion of the hydraulic composition, the weight average molecular weight of the polymer thickener is preferably 20,000 or more, more preferably 50,000 or more, even more preferably 100,000 or more, still more preferably 200,000 or more, still more preferably 400,000 or more, and preferably 10 million or less, more preferably 6.5 million or less, still more preferably 5 million or less, still more preferably 3.5 million or less, still more preferably 2.5 million or less, still more preferably 2 million or less, still more preferably 1.7 million or less, and still more preferably 1.5 million or less.
[0036] The weight average molecular weight of the polymer thickener is determined by gel permeation chromatography under the following conditions, using a mixed solvent of acetonitrile and water (phosphate buffer) as a developing solvent and polyethylene glycol as a standard substance. Column: GMPWXL-GMPWXL (anion) manufactured by Tosoh Corporation Detector: Differential refractometer Eluent: 0.2M phosphate buffer / acetonitrile = 9 / 1 Standards: Polyethylene glycol equivalent (monodisperse polyethylene glycol with known molecular weights, molecular weights: 21,000, 44,200, 101,000, 185,000, 580,000, 977,000) Conditions: Column temperature: 40°C, flow rate: 0.5mL / min, concentration: 2mg / mL
[0037] The hydraulic composition for spraying of the present invention may contain a polymer thickener in an amount of preferably 0.001% by mass or more, more preferably 0.002% by mass or more, even more preferably 0.003% by mass or more, still more preferably 0.004% by mass or more, and even more preferably 0.01% by mass or more from the viewpoint of the adhesion of the hydraulic composition, and may contain preferably 0.2% by mass or less, more preferably 0.1% by mass or less, and even more preferably 0.05% by mass or less from the viewpoint of the dischargeability of the hydraulic composition.
[0038] The hydraulic composition for spraying of the present invention may contain a polymer thickener in an amount of preferably 0.01% by mass or more, more preferably 0.02% by mass or more, and even more preferably 0.05% by mass or more, based on the hydraulic powder in the hydraulic composition for spraying, from the viewpoint of the adhesion of the hydraulic composition, and preferably 1.0% by mass or less, more preferably 0.5% by mass or less, and even more preferably 0.3% by mass or less, from the viewpoint of the ejection workability of the hydraulic composition.
[0039] The hydraulic composition for spraying of the present invention may contain a polyalkylene oxide in an amount of preferably 0.001% by mass or more, more preferably 0.002% by mass or more, even more preferably 0.003% by mass or more, still more preferably 0.004% by mass or more, and even more preferably 0.01% by mass or more from the viewpoint of the adhesion of the hydraulic composition, and in an amount of preferably 0.1% by mass or less, more preferably 0.05% by mass or less, and even more preferably 0.02% by mass or less from the viewpoint of the dischargeability of the hydraulic composition.
[0040] The hydraulic composition for spraying of the present invention may contain a polyalkylene oxide in an amount of preferably 0.01 mass % or more, more preferably 0.02 mass % or more, even more preferably 0.05 mass % or more, and preferably 0.3 mass % or less, more preferably 0.2 mass % or less, even more preferably 0.1 mass % or less, relative to the hydraulic powder in the hydraulic composition for spraying, from the viewpoint of the adhesion of the hydraulic composition.
[0041] The hydraulic composition for spraying of the present invention may contain a polymeric compound having a carboxy group in an amount of preferably 0.005% by mass or more, more preferably 0.01% by mass or more, even more preferably 0.02% by mass or more, and even more preferably 0.04% by mass or more from the viewpoint of the adhesion of the hydraulic composition, and in an amount of preferably 0.2% by mass or less, more preferably 0.1% by mass or less, and even more preferably 0.06% by mass or less from the viewpoint of the ejection property of the hydraulic composition.
[0042] The hydraulic composition for spraying of the present invention may contain a polymeric compound having a carboxy group in an amount of preferably 0.05% by mass or more, more preferably 0.1% by mass or more, even more preferably 0.2% by mass or more, and preferably 1.0% by mass or less, more preferably 0.5% by mass or less, even more preferably 0.3% by mass or less, based on the hydraulic powder in the hydraulic composition for spraying, from the viewpoint of adhesion of the hydraulic composition.
[0043] <Clay minerals> The spray hydraulic composition of the present invention may optionally contain a clay mineral. From the viewpoint of the adhesiveness of the hydraulic composition, the clay mineral is preferably one having a swelling degree of 15 mL / 2 g or more and 50 mL / 2 g or less.
[0044] From the viewpoint of spreading of the sprayable hydraulic composition, the swelling degree of the clay mineral is 15 mL / 2 g or more, preferably 20 mL / 2 g or more, and 50 mL / 2 g or less, preferably 45 mL / 2 g or less, more preferably 40 mL / 2 g or less. This degree of swelling is measured according to the swelling test method for bentonite (powdered) in JBAS104:77 of the Japan Bentonite Industry Association. That is, 2.0 g of sample adjusted to 8.0% moisture by mass is added in about 10 separate portions to a 100 mL stoppered measuring cylinder containing 100 mL of distilled water. The next addition is made after the previous addition has settled to the bottom of the measuring cylinder. After leaving it for 24 hours, the apparent volume of the swollen sample mass at the bottom of the measuring cylinder is read from the graduations on the measuring cylinder and expressed as the degree of swelling (mL / 2g).
[0045] The clay mineral may be a cation-exchangeable layered silicate. One example of such a clay mineral may be one or more clay minerals selected from smectite and bentonite. Smectite is a group of cation-exchangeable layered silicates belonging to clay minerals, and natural products include montmorillonite, which is well known as the main component of bentonite, as well as beidellite, hectorite, saponite, nontronite, etc., and synthetic products include swelling fluorine-based micas, etc. Among these, the clay mineral contained in the spray hydraulic composition of the present invention is preferably a clay mineral selected from bentonite, saponite, hectorite, and montmorillonite, more preferably a clay mineral selected from bentonite and montmorillonite, and even more preferably bentonite, from the viewpoint of the adhesion of the hydraulic composition. The content of the clay mineral selected from bentonite, saponite, hectorite and montmorillonite in the clay minerals contained in the hydraulic composition for spraying is preferably 60 mass% or more, more preferably 100 mass%, and further preferably the content of bentonite is 100 mass%.
[0046] From the viewpoint of adhesion of the hydraulic composition, the sprayable hydraulic composition of the present invention may contain a clay mineral in an amount of preferably 0.02 mass % or more, more preferably 0.05 mass % or more, even more preferably 0.1 mass % or more, even more preferably 0.2 mass % or more, and preferably 1 mass % or less, more preferably 0.5 mass % or less, even more preferably 0.3 mass % or less.
[0047] The hydraulic composition for spraying of the present invention may contain a clay mineral in an amount of preferably 0.1 mass % or more, more preferably 0.3 mass % or more, even more preferably 0.5 mass % or more, and preferably 3 mass % or less, more preferably 2.5 mass % or less, even more preferably 2 mass % or less, relative to the hydraulic powder in the hydraulic composition for spraying, from the viewpoint of adhesion of the hydraulic composition.
[0048] The hydraulic composition for spraying of the present invention contains water. Examples of water include tap water, groundwater, lake water, and river water.
[0049] <Accelerating agent> The sprayable hydraulic composition of the present invention may optionally contain an accelerator. The accelerator is preferably a powder accelerator. The accelerator is, for example, one or more accelerators selected from a cement mineral-based accelerator and an aluminum-based accelerator.
[0050] The cement mineral-based quick-setting admixture may be at least one selected from calcium aluminate, calcium sulfoaluminate, and calcium aluminate. The aluminum-based quick-setting admixture may be at least one selected from aluminum salts including aluminum hydroxide, sodium aluminate, potassium aluminate, aluminum sulfate, aluminum chloride, potassium aluminum sulfate, potassium alum, iron alum, and ammonium iron alum. From the viewpoint of adhesion and strength development of the hydraulic composition, the quick-setting admixture is preferably one or more selected from calcium aluminate, calcium sulfoaluminate, calcium aluminate, aluminum sulfate, sodium aluminate, and aluminum sulfate, more preferably one or more selected from calcium aluminate, calcium sulfoaluminate, and aluminum sulfate, and even more preferably one or more selected from calcium aluminate and aluminum sulfate.
[0051] In the spray hydraulic composition of the present invention, an additive for spray hydraulic composition (hereinafter referred to as the additive of the present invention), which is a mixture of the above clay mineral and quick-setting agent, may be used. The additive is mixed with the hydraulic composition containing hydraulic powder and water when the spray hydraulic composition is sprayed. The additive of the present invention contains a quick-setting admixture in an amount of preferably 50% by mass or more, more preferably 60% by mass or more, even more preferably 70% by mass or more, and preferably 98% by mass or less, more preferably 96% by mass or less, even more preferably 95% by mass or less, from the viewpoints of adhesion and strength development of the hydraulic composition.
[0052] When the hydraulic composition for spraying of the present invention contains a quick-setting admixture, the hydraulic composition for spraying of the present invention contains, from the viewpoints of adhesion and strength expression of the hydraulic composition, preferably 4 parts by mass or more, more preferably 6 parts by mass or more, even more preferably 6.5 parts by mass or more, still more preferably 7 parts by mass or more, and preferably 15 parts by mass or less, more preferably 12 parts by mass or less, and even more preferably 10 parts by mass or less of the quick-setting admixture per 100 parts by mass of the hydraulic powder.
[0053] The sprayable hydraulic composition of the present invention may contain, as necessary, one or more of high-performance water-reducing agents, high-performance AE water-reducing agents, water-reducing agents including AE water-reducing agents and fluidizing agents, expansive agents, hardening accelerators, hardening retarders, polymers for cement, foaming agents, waterproofing agents, rust inhibitors, shrinkage reducing agents, pigments, fibers, water repellents, and efflorescence inhibitors (excluding those equivalent to the above-mentioned polymer thickeners).
[0054] <Method of spraying hydraulic composition> The present invention provides a method for spraying a hydraulic composition, which comprises spraying a hydraulic composition containing hydraulic powder and water onto a target surface with a hydraulic composition spraying device of the present invention. Examples of target surfaces include inner surfaces of tunnels such as roads, railways, and waterways, and slopes formed by natural excavation, embankments, and the like. In the method for spraying a hydraulic composition of the present invention, the hydraulic composition spraying device 1 according to the embodiment of the present invention can be suitably used. In the method for spraying a hydraulic composition of the present invention, the above-mentioned hydraulic composition for spraying of the present invention can be suitably used. Therefore, in the method for spraying the hydraulic composition of the present invention, the aspects described in the hydraulic composition spraying device 1 according to the embodiment of the present invention and the hydraulic composition for spraying of the present invention can be appropriately applied.
[0055] The method for spraying the hydraulic composition of the present invention will be described in detail with reference to a specific example, but the method for spraying the hydraulic composition of the present invention is not limited to this specific example. In the method for spraying a hydraulic composition of the present invention, first, hydraulic powder, water, optionally a polymer thickener, and optionally an aggregate are mixed to produce a hydraulic composition. In the present invention, a hydraulic composition for spraying is produced by optionally adding a clay mineral and / or a quick-setting agent to a hydraulic composition obtained by mixing hydraulic powder, water, an optional polymer thickener, and an optional aggregate. The mixing of the hydraulic composition and the clay mineral and / or a quick-setting agent can be carried out, for example, by a general wet spraying method in which the hydraulic composition and the clay mineral and / or a quick-setting agent are compressed in air and mixed together. Alternatively, the clay mineral and the quick-setting agent may be mixed in advance and then mixed with the hydraulic composition. The hydraulic composition produced by mixing hydraulic powder, water, optionally a polymer thickener, and optionally an aggregate has a water / hydraulic powder ratio (W / C) [the mass percentage (mass%) of water and hydraulic powder in the hydraulic composition] of preferably 30 mass% or more, more preferably 40 mass% or more, even more preferably 50 mass% or more, and preferably 80 mass% or less, more preferably 70 mass% or less, even more preferably 65 mass% or less, from the viewpoint of the adhesiveness and discharge workability of the hydraulic composition. Usually, the water / hydraulic powder ratio of the hydraulic composition is reflected in the subsequently produced hydraulic composition for spraying. Therefore, in the present invention, the water / hydraulic powder ratio of the hydraulic composition for spraying is also preferably within the above range.
[0056] In the present invention, the polymer thickener is mixed in an amount of preferably 0.01 part by mass or more, more preferably 0.02 part by mass or more, and even more preferably 0.05 part by mass or more, relative to 100 parts by mass of the hydraulic powder in the hydraulic composition, from the viewpoint of the adhesiveness of the hydraulic composition, and preferably 1.0 part by mass or less, more preferably 0.5 part by mass or less, and even more preferably 0.3 part by mass or less, from the viewpoint of the discharge workability of the hydraulic composition. That is, in the present invention, from the viewpoint of adhesion of the hydraulic composition, the polymer thickener is mixed with the hydraulic powder in the hydraulic composition in an amount of preferably 0.01 mass % or more, more preferably 0.02 mass % or more, even more preferably 0.05 mass % or more, and preferably 1.0 mass % or less, more preferably 0.5 mass % or less, even more preferably 0.3 mass % or less.
[0057] In the present invention, the mixing of optional components such as hydraulic powder, polymer thickener, water, and aggregate can be performed by a known method. Specifically, a method of simultaneously mixing hydraulic powder, water, and aggregate can be used. A mixing mixer such as a pan-type forced mixer, a two-shaft forced mixer, or a tilting mixer can be used to mix these components.
[0058] In the present invention, a hydraulic composition for spraying is produced by adding optionally a clay mineral and / or a quick-setting agent to a hydraulic composition obtained by mixing hydraulic powder, water and an arbitrary aggregate. The mixing of the hydraulic composition and the clay mineral and / or a quick-setting agent can be carried out, for example, by a general wet spraying method in which the hydraulic composition and the clay mineral and / or a quick-setting agent are compressed by air and mixed together. Alternatively, the clay mineral and the quick-setting agent may be mixed in advance and then mixed with the hydraulic composition.
[0059] In the present invention, the clay mineral is mixed in an amount of preferably 0.1 parts by mass or more, more preferably 0.2 parts by mass or more, and even more preferably 0.5 parts by mass or more, relative to 100 parts by mass of the hydraulic powder in the hydraulic composition, from the viewpoint of the adhesiveness of the hydraulic composition, and preferably 5 parts by mass or less, more preferably 4 parts by mass or less, and even more preferably 2.5 parts by mass or less, from the viewpoint of the discharge workability of the hydraulic composition. That is, in the present invention, the clay mineral is mixed with the hydraulic powder in the hydraulic composition in an amount of preferably 0.1 mass % or more, more preferably 0.2 mass % or more, and even more preferably 0.5 mass % or more from the viewpoint of the adhesiveness of the hydraulic composition, and preferably 5 mass % or less, more preferably 4 mass % or less, and even more preferably 2.5 mass % or less from the viewpoint of the discharge workability of the hydraulic composition.
[0060] In the present invention, when the quick-setting admixture is used, the quick-setting admixture is mixed in an amount of preferably 4 parts by mass or more, more preferably 6 parts by mass or more, even more preferably 6.5 parts by mass or more, still more preferably 7 parts by mass or more, and preferably 15 parts by mass or less, more preferably 12 parts by mass or less, and even more preferably 10 parts by mass or less, relative to 100 parts by mass of the hydraulic powder in the hydraulic composition, from the viewpoints of adhesion and strength expression of the hydraulic composition.
[0061] In the method for spraying the hydraulic composition of the present invention, the thus prepared hydraulic composition for spraying is sprayed onto an object, which corresponds to the so-called wet spraying method. The method for spraying the hydraulic composition of the present invention can be carried out using the hydraulic composition spraying device 1 of the present invention. It is possible to use a product called "Natocrete" manufactured by Chiyoda Seisakusho Co., Ltd. for pressure-feeding a mixture of clay mineral and quick-setting admixture, mix them together to prepare a hydraulic composition for spraying, and then spray the composition.
[0062] <Evaluation device for hydraulic composition> As shown in FIG. 2, the hydraulic composition evaluation device 4 according to an embodiment of the present invention includes a hydraulic composition spraying device 1 and a sprayed member 5 that is disposed opposite the discharge nozzle 2b of the spraying device 1 and onto which the hydraulic composition is sprayed from the spraying device 1. In the description of the hydraulic composition evaluation device 4, the same components as those of the spraying device 1 shown in FIG. 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.
[0063] The member to be sprayed 5 may be, for example, a wooden board. The member to be sprayed 5 is provided inside a resin box 6. The box 6 has an inner wall 6a on which the member to be sprayed 5 is provided and an opening 6b facing the inner wall 6a, and the opening 6b is provided with a lid 6c that closes the opening 6b. The lid 6c has an opening 6d through which the discharge nozzle 2b of the spraying device 1 of the present invention is inserted, and the spraying device 1 is provided on the lid 6c by inserting the discharge nozzle 2b into the opening 6d. The lid 6c also has an opening 6e through which a filter 7 is provided, and compressed air supplied from the air compressor 8 through the input section 3 into the main body 2 of the spraying device 1 is sprayed from the discharge nozzle 2b into the box 6 and discharged outside the box 6 through the filter 7. In addition, compressed air supplied inside the main body 2 flows from the inside of the main body 2 toward the discharge nozzle 2b, creating a negative pressure inside the main body 2 on the side opposite the discharge nozzle 2b. A hydraulic composition storage section (not shown) is connected to the main body 2 via a transport pipe 9, and this negative pressure causes the hydraulic composition in the storage section to be sucked into the main body 2. The hydraulic composition sucked into the main body 2 is mixed with the compressed air inside the main body 2, and is sprayed from the discharge nozzle 2b to the sprayed member 5. The filter 7 is not particularly limited as long as it allows compressed air to pass through and can capture dust, and for example, paper, cloth, fiber, sponge, etc. can be used.
[0064] The hydraulic composition evaluation device 4 of the present invention is suitable for carrying out a simple evaluation of a hydraulic composition since the hydraulic composition has excellent adhesion. It is believed that the evaluation results of the hydraulic composition in the hydraulic composition evaluation apparatus 4 of the present invention will show similar trends even when the hydraulic composition is sprayed by an apparatus other than the spraying apparatus 1.
[0065] <Evaluation method of hydraulic composition> The hydraulic composition evaluation device 4 according to the embodiment of the present invention will be specifically described in detail by exemplifying a hydraulic composition evaluation method of the present invention. The present invention provides a method for evaluating a hydraulic composition, which comprises spraying the hydraulic composition to be evaluated onto a member to be sprayed using the hydraulic composition spraying device of the present invention. In the hydraulic composition evaluation method of the present invention, the hydraulic composition evaluation device 4 according to the embodiment of the present invention can be suitably used.
[0066] The evaluations performed by the hydraulic composition evaluation device 4 include (1) evaluation of the adhesion of the hydraulic composition, (2) evaluation of the workability of the hydraulic composition, and (3) evaluation of the amount of dust generated when the hydraulic composition is sprayed.
[0067] In the evaluations (1) to (3), the hydraulic composition is sprayed onto the target member 5 by the spraying device 1, and the following evaluations (1) to (3) can be performed.
[0068] (1) Evaluation of adhesion of hydraulic composition In the evaluation of the adhesion of the hydraulic composition, the adhesion rate shown in the following formula (1) is calculated based on the mass of the hydraulic composition adhered to the sprayed member 5 and the total mass of the hydraulic composition sprayed onto the sprayed member 5. The adhesion of the hydraulic composition is evaluated based on this adhesion rate. The higher the adhesion rate of the hydraulic composition, the higher the adhesion of the hydraulic composition can be evaluated. Adhesion rate (mass%) = 100 × (mass of hydraulic composition adhered to the sprayed member 5) / (total mass of hydraulic composition sprayed on the sprayed member 5) (1) The adhesion can also be evaluated by visually observing the hydraulic composition adhered to the sprayed member 5 and evaluating the adhesion of the hydraulic composition based on the adhesion state of the hydraulic composition.
[0069] (2) Evaluation of workability of hydraulic composition The workability of the hydraulic composition is evaluated, for example, based on the spreadability of the hydraulic composition. A hydraulic composition with reduced spreadability is easy to layer, and the workability of the spraying operation is improved. The spreadability (%) of the hydraulic composition is calculated, for example, by the following formula (2) based on the mass of the hydraulic composition adhered outside a certain circle from the center of the hydraulic composition sprayed onto the sprayed member 5 and the mass of the hydraulic composition adhered within this circle. The lower the spreadability, the less the hydraulic composition spreads. Spreadability (%) = 100 x [mass of hydraulic composition attached to the outside of the circle] / [mass of hydraulic composition attached to the inside of the circle] (2)
[0070] (3) Evaluation of dust generation during spraying of hydraulic composition In evaluating the amount of dust generated when spraying the hydraulic composition, for example, the surface of the filter 7 is measured with a color difference meter, and the amount of dust adhering to the filter 7 can be quantified and evaluated based on the shade of the filter 7 before and after the spraying of the hydraulic composition. EXAMPLES
[0071] (1) Preparation of hydraulic composition for spray application The components of the spray hydraulic composition are as follows:
[0072] <Components of hydraulic composition for spray application> <Hydraulic composition> Water: Tap water Cement (hydraulic powder): A 1:1 mixture of ordinary Portland cement manufactured by Taiheiyo Cement Corporation and ordinary Portland cement manufactured by Sumitomo Osaka Cement Corporation. Aggregate (sand): Mountain sand from Joyo City, Kyoto Prefecture Surface-dried specific gravity: 2.55 <Polymer thickener> PEO: Polyethylene oxide, weight average molecular weight (Mw) 800,000, average number of moles added 1,816 mol, (product name) Alcox, manufactured by Meisei Chemical Industry Co., Ltd. Polyacrylic acid: Julimer AC-10LHPK, manufactured by Toagosei Co., Ltd., weight average molecular weight 2,000,000 <Clay minerals> Clay minerals: Bentonite, Kunigel GS, manufactured by Kunimine Kogyo Co., Ltd., swelling degree 33mL / 2g
[0073] The swelling degree of clay minerals was measured according to the swelling test method for bentonite (powdered) in JBAS104:77 of the Japan Bentonite Industry Association. That is, 2.0 g of sample adjusted to 8.0 mass% moisture was added in about 10 separate portions to a 100 mL stoppered measuring cylinder containing 100 mL of distilled water. The next addition was made after the previous addition had settled to the bottom of the measuring cylinder. After leaving it for 24 hours, the apparent volume of the swollen sample mass at the bottom of the measuring cylinder was read from the graduations on the measuring cylinder and was taken as the swelling degree (mL / 2g).
[0074] The hydraulic composition was prepared using a mortar mixer as specified in "JIS R 5201 Physical Test Methods for Cement." 240g of water, 400g of hydraulic powder, and 1054g of sand were added to the mixing bowl of a mortar mixer and mixed at low speed for 2 minutes. When polyethylene oxide and polyacrylic acid were added, they were added at the same time as the sand. Clay minerals were added to the obtained hydraulic composition as necessary, and the mixture was mixed at high speed for 10 seconds to obtain a hydraulic composition for spraying.
[0075] (2) Evaluation The obtained hydraulic composition for spraying was sprayed onto a wooden board 5a using evaluation devices A to C shown in Figs. 3 to 5, and the adhesion rate of the hydraulic composition was evaluated. For evaluation devices A and B, a powder / granular material conveying device (Breath Rider K-20 model, manufactured by Breath Co., Ltd.) was used as the spraying device. For evaluation device C, a homemade evaluation device with the configuration shown in Figure 5 was used, which was made by connecting plastic parts. In the evaluation devices A and B, compressed air of 0.6 MPa and 22.5 L / min was supplied from the compressor 8a to the main body 2 of the powder / granular material conveying device, and the hydraulic composition was sucked into the main body 2 by the negative pressure in the main body 2, and the sucked hydraulic composition was mixed with the compressed air and sprayed onto the wooden board 5a. The amount of mortar sprayed was 4.2 L / min. The discharge nozzle 2b of the evaluation device A A Length of the discharge nozzle 2b A The distance L between the tip of the discharge nozzle 2b and the end of an opening (not shown) formed in the inner wall of the main body 2 through which compressed air from the input part 3 flows is 6.5 cm. AThe diameter of the opening was 2 cm, and L / d was 3.25. B Length of the discharge nozzle 2b B The distance L between the tip of the discharge nozzle 2b and the end of an opening (not shown) formed in the inner wall of the main body 2 through which compressed air from the input part 3 flows is 21 cm. B The diameter of the opening was 2 cm, and L / d was 10.5. In the evaluation devices A and B, the hydraulic composition was sprayed onto the wooden board 5a for 10 seconds. The evaluation device C is an evaluation device equipped with a spraying device that uses the pressure of a compressor 8a to push out the hydraulic composition placed in the flow path of the conveying pipe 10 and spray it onto the wooden board 5a. The diameter of the opening at the tip of the conveying pipe 10 was 2 cm. The adhesion rate (%) was calculated from the total mass of the sprayed hydraulic composition and the mass of the hydraulic composition adhered to the wooden board 5a by the following formula (3), and the adhesion rates of the evaluation devices A to C were evaluated. The higher the adhesion rate, the more economically and environmentally excellent the spray device is. Adhesion rate (%) = 100 × (mass of hydraulic composition attached to wooden board 5a) / (mass of hydraulic composition sprayed on wooden board 5a) (3) In Table 1, the adhesion of the hydraulic composition in each device was evaluated based on an index in which an evaluation device with an adhesion rate of 30% or more was rated "excellent" and an evaluation device with an adhesion rate of less than 30% was rated "poor."
[0076] In addition, the evaluation devices A to B were evaluated for simplicity and economy based on the following indexes. With the evaluation devices A and B, the hydraulic composition could be sprayed simply by continuously feeding the hydraulic composition into the conveying pipe 9, making the spraying work easier. On the other hand, in order to continuously spray the hydraulic composition, the evaluation device C required a pump for pumping the hydraulic composition to prevent back-spray from the hydraulic composition inlet, and further required the installation of a driving power source for the pump and additional fuel for the power source, which was economically disadvantageous. Furthermore, when the hydraulic composition was not continuously sprayed, the evaluation device C required a sealing operation of the hydraulic composition inlet to prevent this back-spray, and the spraying work of the hydraulic composition was complicated by repeating this sealing operation and the injecting of the hydraulic composition. [Indicators of simplicity and economy] ○: No additional work or equipment is required when continuously feeding hydraulic composition ×: Additional work or equipment is required when continuously feeding hydraulic composition.
[0077] [Table 1]
[0078] [Table 2] [Explanation of symbols]
[0079] 1 Spraying equipment 2 Main unit 2a Suction port, 2b, 2b A , 2b B Discharge Nozzle 3. Input section 4. Evaluation equipment 5, 5a Sprayed material (wooden board) 6 boxes 6a inner wall, 6b opening, 6c lid, 6d opening, 6e opening 7 Filters 8, 8a Air compressor 9, 10 Conveyor pipe 11 Valve A, B, C evaluation device
Claims
1. A hydraulic composition spraying device for spraying a hydraulic composition onto a target surface, a cylindrical main body having a suction port for sucking the hydraulic composition and a discharge nozzle for discharging the hydraulic composition sucked from the suction port; an input section provided on a side of the main body and configured to supply compressed air flowing from an inner surface of the main body toward the discharge nozzle into the main body, a ratio L / d of a distance L between the tip of the discharge nozzle and an end of an opening formed in the inner wall of the main body through which compressed air from the input portion flows to an inner diameter d of an opening at the tip of the discharge nozzle is 1.5 or more and 5.0 or less; Hydraulic composition spraying device.
2. 2. The hydraulic composition spraying device according to claim 1, wherein the inner diameter d of the opening at the tip of the discharge nozzle is 1.0 cm or more and 7.0 cm or less.
3. 3. The hydraulic composition spraying device according to claim 1, further comprising an air compressor that supplies compressed air to the input section, and the pressure of the compressed air supplied from the air compressor is 0.2 MPa or more and 0.9 MPa or less.
4. A method for spraying a hydraulic composition, comprising spraying a hydraulic composition containing hydraulic powder and water onto a target surface using the hydraulic composition spraying device according to claim 1 or 2.
5. The method for spraying a hydraulic composition according to claim 4 , wherein the hydraulic composition contains a clay mineral.
6. The method for spraying a hydraulic composition according to claim 4, wherein the hydraulic composition contains a polymer thickener.
7. The method for spraying a hydraulic composition according to claim 6, wherein the polymer thickener is at least one selected from the group consisting of polyalkylene oxides and polymer compounds having a carboxy group.
8. 3. An evaluation device for a hydraulic composition, comprising: a spraying device for a hydraulic composition according to claim 1 or 2; and a sprayed member that is provided opposite the discharge nozzle of the spraying device and onto which the hydraulic composition is sprayed from the spraying device.
9. 9. The hydraulic composition evaluation device according to claim 8, further comprising a box for accommodating the sprayed member, the sprayed member being provided on one inner wall of the box, and the spraying device being provided on a side of the box facing the inner wall.
10. A method for evaluating a hydraulic composition, comprising spraying the hydraulic composition to be evaluated onto a target member using the hydraulic composition spraying device according to claim 1 or 2.