Method for transporting hydraulic composition

Abstract

To provide a method for transferring a hydraulic composition, which hardly causes a transfer failure such as adhesion of the hydraulic composition to the inside of piping when the hydraulic composition is transferred using metal piping.SOLUTION: There is provided a method for transferring a hydraulic composition containing water, a hydraulic powder, and a thickener through metal piping in which the thickener is an amine oxide-type surfactant.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a method for transporting a hydraulic composition. [Background technology]

[0002] Hydraulic compositions such as concrete and mortar are used in various fields such as civil engineering and construction, etc. For example, hydraulic compositions are used in the manufacture of underground impermeable walls, underground piles, etc. In addition, various chemical admixtures such as air-entraining agents, water-reducing agents, air-entraining water-reducing agents, high-range water-reducing agents, superplasticizers, and setting retarders are generally used in hydraulic compositions to adjust their workability, fluidity, strength, setting time, hardening time, etc.

[0003] Patent Document 1 discloses a method for constructing underground diaphragm wall concrete, in which concrete containing a mixture of cement, fine aggregate, coarse aggregate, and admixtures is poured into the ground to construct an underground diaphragm wall concrete, using at least an air-entraining water-reducing agent or a high-performance air-entraining water-reducing agent and a thickener as the admixtures, and using as the thickeners compound (α), an aromatic compound having a sulfone group and / or its salt, and compound (β), an alkyltrimethylammonium salt, to form concrete with a slump flow of 350 mm or more.

[0004] Patent Document 2 discloses a rheology modifier containing two or more specific amine oxides with different structures.

[0005] Patent Document 3 discloses a self-compacting concrete composition containing an alkylamine oxide in which the alkyl group has 8 to 22 carbon atoms and a high-performance water-reducing agent, the concrete having a slump flow value (spread measured according to JIS-A 1101) of 50 cm or more.

[0006] Furthermore, hydraulic compositions are often transported from the place where they are prepared to the place where they are used, and in this case, for example, an apparatus equipped with means for supplying, transporting, discharging, etc., the hydraulic composition is used.

[0007] Patent Document 4 discloses a method for injecting air mortar over long distances by pressure feeding, which comprises mixing cement with water and / or fillers such as clay sand, china clay, and sand at a mortar supply base having a raw material tank, a kneader, and a pressure pump to prepare mortar paste, passing the mortar paste through piping connecting the pressure pump to a foaming mixing unit installed in a position close to the air mortar injection site, and pressure feeding the mortar paste to the foaming mixing unit by the pressure feed pump, introducing a foaming agent and compressed air from a foaming agent supply device and a compressed air supply source separately installed in the mixer of the foaming mixing unit, and continuously mixing them with the mortar paste to prepare air mortar, and continuously injecting the air mortar into the injection site by an injection hose connected to the discharge side of the mixer.

[0008] Patent Document 5 discloses a slurry supplying device that supplies a slurry stored in a slurry storage section by adjusting the flow rate, and is characterized by having a comparison liquid storage section that stores a measurement comparison liquid whose properties that affect pump delivery are the same as those of the slurry, a linked pump that delivers the slurry stored in the slurry storage section and the measurement comparison liquid stored in the comparison liquid storage section through separate systems under the same conditions, and a comparison liquid flow meter that measures the delivery flow rate of the measurement comparison liquid.

[0009] Patent Document 6 discloses a concrete transport pipe characterized by having a non-rotating resistor extending from the inner wall of the pipe into the pipe and resisting the flow of concrete inside the pipe.

[0010] Patent Document 7 discloses a method for pumping a cement-based material that does not separate underwater into a pipe, the method comprising the steps of injecting a liquid having a lower viscosity than the cement-based material into the pipe through a liquid injection tube, and adhering the injected liquid to the inner surface of the pipe to form a lubricating layer on the inner surface. [Prior art documents] [Patent documents]

[0011] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-2347 [Patent Document 2] Japanese Patent Publication No. 2020-76022 [Patent Document 3] Japanese Patent Application Publication No. 8-133805 [Patent Document 4] Japanese Patent Application Publication No. 59-154297 [Patent Document 5] Japanese Patent Application Laid-Open No. 2014-228509 [Patent Document 6] Japanese Patent Application Publication No. 2019-120074 [Patent Document 7] Japanese Patent Publication No. 2020-203744 Summary of the Invention [Problem to be solved by the invention]

[0012] As a hydraulic composition, an underwater non-separable hydraulic composition that exhibits little material separation in water is known. In general, the underwater non-separable property is imparted to a hydraulic composition by adding a thickener or the like. On the other hand, known pipes used for transporting hydraulic compositions are made of metals such as stainless steel, or plastics such as fluororesins. However, when a hydraulic composition using a thickener is passed through a metal pipe, the hydraulic composition may adhere to the inside of the pipe, causing transport problems.

[0013] The present invention provides a method for transferring a hydraulic composition that is less likely to cause transfer problems such as adhesion of the hydraulic composition to the inside of a metal pipe when transferring the hydraulic composition using the metal pipe. [Means for solving the problem]

[0014] The present invention relates to a method for transporting a hydraulic composition, which comprises passing the hydraulic composition containing water, hydraulic powder, and a thickener through a metal pipe, wherein the thickener is an amine oxide surfactant. [Effects of the Invention]

[0015] According to the present invention, there is provided a method for transferring a hydraulic composition which is less likely to cause transfer problems such as adhesion of the hydraulic composition to the inside of the pipe when transferring the hydraulic composition using a metal pipe. DETAILED DESCRIPTION OF THE INVENTION

[0016] In the present invention, by allowing an amine oxide surfactant to coexist in the hydraulic composition, transport obstacles when the hydraulic composition is transported through a metal pipe are significantly suppressed. Polymer-based thickeners are known as thickeners for hydraulic compositions. Hydraulic compositions using polymer-based thickeners have a significantly increased viscosity, allowing them to adhere to the surface of an object with a thick layer. Hydraulic compositions thickened in this way are also used in plastering, for example. Thickeners are also used to impart non-separation properties to hydraulic compositions in water. On the other hand, surfactant-based thickeners are also known as thickeners for hydraulic compositions. Hydraulic compositions using surfactant-based thickeners have lower viscosity than hydraulic compositions using polymer-based thickeners, making them less likely to be layered on objects, but surfactant-based thickeners generally have strong ionic properties and tend to be electrostatically adsorbed to metal surfaces, which is thought to increase the adhesion of hydraulic compositions to objects. In contrast, the amine oxide surfactant used in the present invention is thought to have weak ionicity and to be less prone to electrostatic adsorption, and as a result, it is thought that adhesion of the hydraulic composition using this surfactant to the inner surface of metal piping can be suppressed. Furthermore, because adhesion to metal piping is suppressed, it is thought that the fluidity of the hydraulic composition is less likely to change even after it has been pumped a predetermined distance.

[0017] First, the hydraulic composition according to the present invention will be described. The water that can be used may be tap water, river water, lake water, or the like.

[0018] The hydraulic powder 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, white Portland cement, and Ecocement (e.g., JIS R5214, etc.). Among these, from the viewpoint of shortening the time required for the hydraulic composition to reach the required strength, cement selected from early-early-strength Portland cement, ordinary Portland cement, sulfate-resistant Portland cement, and white Portland cement is preferred, and cement selected from early-early-strength Portland cement and ordinary Portland cement is more preferred.

[0019] The hydraulic powder may contain blast furnace slag, fly ash, silica fume, anhydrous gypsum, etc., or may contain 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 be used. Clay such as bentonite may also be contained within a range that does not impair the effects of the present invention.

[0020] In the present invention, an amine oxide surfactant (hereinafter referred to as component (A)) is used as a thickener. The amine oxide surfactant of component (A) may be a surfactant having an amine oxide group. Examples of amine oxide surfactants include amine oxides having one hydrocarbon group with 8 or more, 14 or more, or 22 or less carbon atoms. Examples of component (A) include compounds represented by the following general formula (1):

[0021] [ka]

[0022] [During the ceremony, X is R 1a or R 1b -[CONH-CH2CH2CH2] n - is a group represented by the formula: R 1a is an alkyl group having 14 to 22 carbon atoms or an alkenyl group having 14 to 22 carbon atoms. R 1b is an alkyl group having 13 to 21 carbon atoms or an alkenyl group having 13 to 21 carbon atoms. n is an integer between 1 and 3. R 2 and R 3 are each independently an alkyl group having 1 to 4 carbon atoms or -(C2H4O) p H. p is the average number of moles added, and R 2 and R 3 The sum of the numbers is between 0 and 5. It is.

[0023] In the present invention, the component (A) is two or more compounds represented by the general formula (1) [hereinafter, also referred to as compound (1)], The two or more compounds have different X's in general formula (1), At least one of the two or more compounds is R of X in general formula (1). 1a or R 1b is a compound in which the alkyl group is an alkenyl group; This aspect will be described below.

[0024] Regarding the compound (1), when X in the general formula (1) is different, for example, when there are two kinds of compound (1), the following embodiments can be mentioned. In the following embodiments, R of at least one of the two kinds of compound (1) is different. 1a or R 1b is an alkenyl group. (i) One R 1a or R 1b is an alkyl group, and the other R 1a or R 1b is an alkenyl group. (ii) One R 1a or R 1b The number of carbon atoms in the other R 1a or R 1b The carbon numbers are different. (iii) One of the Xs is R 1a and the other X is R 1b -[CONH-CH2CH2CH2] n -It is. (iv) Both X and R 1b -[CONH-CH2CH2CH2] n - and one n is different from the other n. (v) A combination of (i) to (iv) above.

[0025] In the general formula (1), X is R 1a or R 1b -[CONH-CH2CH2CH2] n - is a group represented by the formula: R 1a is an alkyl group having 14 to 22 carbon atoms or an alkenyl group having 14 to 22 carbon atoms. R 1a When is an alkenyl group, it preferably has 18 or more carbon atoms and preferably 22 or less carbon atoms. R 1a When is an alkyl group, it preferably has 16 or more carbon atoms and preferably has 22 or less carbon atoms. R 1b is an alkyl group having 13 to 21 carbon atoms or an alkenyl group having 13 to 21 carbon atoms. R1b When is an alkenyl group, it preferably has 17 or more carbon atoms and preferably 21 or less carbon atoms. R 1b When is an alkyl group, it preferably has 15 or more carbon atoms and preferably 21 or less carbon atoms. n is an integer of 1 or more and 3 or less. Preferably, n is 0 or 1. R 2 and R 3 are each independently preferably an alkyl group having 1 to 2 carbon atoms or (C2H4O) p It is a group represented by H. p is preferably a number between 0 and 3.

[0026] In the present invention, two or more, preferably five or less, more preferably two types of compounds (1) having different X's in the general formula (1) are used. At least one of the two or more compounds (1) used in the present invention has a different R of X's in the general formula (1). 1a or R 1b is an alkenyl group having 14 to 22 carbon atoms, that is, R in X in general formula (1) 1a an alkenyl group having 14 to 22 carbon atoms as R 1b It is a compound containing an alkenyl group having 13 to 21 carbon atoms as the alkyl group.

[0027] In the present invention, there are two types of compound (1), and one of the two types of compound (1), including the above (i) to (v), is a compound in which X in the general formula (1) is R 1a and a compound having an alkenyl group with a carbon number of 14 to 22. That is, the component (A) is two types of compounds represented by the general formula (1), and the two types of compounds have different X in the general formula (1), and one of the two types of compounds has X in the general formula (1) as R 1a and R 1a is preferably an alkenyl group compound.

[0028] As the component (A), X in the general formula (1) is R 1a or R 1b -[CONH-CH2CH2CH2]n - (wherein R 1a is an alkenyl group having 14 to 22 carbon atoms, and R 1b is an alkenyl group having from 13 to 21 carbon atoms) and a compound (1b) in which X in the general formula (1) is different from that of the compound (1a). Specific examples of the component (A) include a combination of a compound (1a) represented by the following general formula (1a) and a compound (1b) represented by the following general formula (1b).

[0029] [ka]

[0030] [During the ceremony, n1 and n2 each independently represent an integer of 0 or more and 3 or less. R 11a When n1 is 0, it is an alkenyl group having 14 to 22 carbon atoms, and when n1 is 1 to 3, it is an alkenyl group having 13 to 21 carbon atoms. R 11b When n2 is 0, it is an alkyl group having 14 to 22 carbon atoms or an alkenyl group having 14 to 22 carbon atoms, and when n2 is 1 to 3, it is an alkyl group having 13 to 21 carbon atoms or an alkenyl group having 13 to 21 carbon atoms. However, if n1 and n2 are the same number, R 11b The alkenyl group in R 11a is an alkenyl group different from R 2 and R 3 are each independently an alkyl group having 1 to 4 carbon atoms or -(C2H4O) p H. p is the average number of moles added, and R 2 and R 3 The sum of the numbers is between 0 and 5. It is.

[0031] In general formula (1a), R 11a The number of carbon atoms is preferably 17 or more and preferably 22 or less. In the general formula (1a), n1 is preferably 0 or 1, and more preferably 0.

[0032] In the general formula (1b), n2 is 0 and R 11b When is an alkyl group, R 11b The number of carbon atoms is preferably 16 or more and preferably 22 or less. In the general formula (1b), n2 is 0 and R 11b When is an alkenyl group, R 11b The number of carbon atoms is preferably 18 or more and preferably 22 or less. In the general formula (1b), n2 is 1 to 3 and R 11b When is an alkyl group, R 11b The number of carbon atoms is preferably 15 or more and preferably 21 or less. In the general formula (1b), n2 is 1 to 3 and R 11b When is an alkenyl group, R 11b The number of carbon atoms is preferably 17 or more and preferably 21 or less. In general formula (1b), R 11b is preferably an alkyl group. In the general formula (1b), n2 is preferably 0 or 1.

[0033] In general formula (1a) or (1b), R 2 and R 3 are each independently preferably an alkyl group having 1 or 2 carbon atoms or -(C2H4O) p It is a group represented by H, and more preferably an alkyl group having 1 or 2 carbon atoms. In the general formula (1a) or (1b), p is preferably a number of 0 or more and 3 or less. If n1 and n2 are the same number, R 11b The alkenyl group in R 11a is an alkenyl group different from

[0034] The component (A) of the present invention may be a combination of a compound (11a) represented by the following general formula (11a) and a compound (1b) represented by the following general formula (1b).

[0035] [ka]

[0036] [During the ceremony, n2 is an integer between 0 and 3 inclusive. R 11a is an alkenyl group having 14 to 22 carbon atoms. R 11b When n2 is 0, it is an alkyl group having 14 to 22 carbon atoms or an alkenyl group having 14 to 22 carbon atoms, and when n2 is 1 to 3, it is an alkyl group having 13 to 21 carbon atoms or an alkenyl group having 13 to 21 carbon atoms. However, if n2 is 0, R 11b The alkenyl group in R 11a is an alkenyl group different from R 2 and R 3 are each independently an alkyl group having 1 to 4 carbon atoms or -(C2H4O) p H. p is the average number of moles added, and R 2 and R 3 The sum of the numbers is between 0 and 5. It is.

[0037] The compound (11a) represented by the general formula (11a) corresponds to the compound in which n1 is 0 in the general formula (1a). 11a , R 2 and R 3 The preferred embodiments of the compound (1b) are the same as those of the general formula (1a). In this combination, the preferred embodiments of the compound (1b) are the same as those of the general formula (1a).

[0038] In the present invention, the mass ratio of compound (1b) / compound (1a) is preferably 5 / 95 or more, more preferably 25 / 75 or more, even more preferably 30 / 70 or more, still more preferably 40 / 60 or more, and preferably 95 / 5 or less, more preferably 75 / 25 or less, even more preferably 70 / 30, still more preferably 65 / 35, still more preferably 60 / 40 or less.

[0039] In the present invention, when a hydraulic composition containing water and hydraulic powder is transported using a metal pipe, the hydraulic composition is made to coexist with (A) an amine oxide surfactant, thereby reducing adhesion of the hydraulic composition to the inside of the metal pipe.

[0040] The hydraulic composition of the present invention may have a water / hydraulic powder ratio (hereinafter sometimes referred to as W / P) of, for example, 30% by mass or more, 40% by mass or more, 50% by mass or more, 60% by mass or more, 65% by mass or more, 70% by mass or more, and 200% by mass or less, 150% by mass or less, or 100% by mass or less. The water / hydraulic powder ratio is the mass percentage (mass %) of water and hydraulic powder in the hydraulic composition, calculated as: water / hydraulic powder x 100. The water / hydraulic powder ratio is calculated based on the amount of powder that hardens upon hydration. In addition to powders that harden upon hydration, such as cement, if the hydraulic powder contains powders selected from powders with pozzolanic properties, powders with latent hydraulic properties, and stone powder (calcium carbonate powder), the amounts of these powders are also included in the amount of hydraulic powder in the present invention. In addition, when a powder having the physical property of hardening by hydration reaction 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, etc., in which the mass of the hydraulic powder is involved.

[0041] From the viewpoint of reducing adhesion of the hydraulic composition to metal piping, the (A) component can be used in a proportion of, for example, 0.001 mass % or more, further 0.005 mass % or more, further 0.01 mass % or more, further 0.1 mass % or more, relative to the water of the hydraulic composition, and from the viewpoint of economy, 10 mass % or less, further 8 mass % or less, further 5 mass % or less, further 1 mass % or less.

[0042] When compound (1) is used as component (A), the total amount of compound (1) relative to the water in the hydraulic composition is preferably 0.001% by mass or more, more preferably 0.01% by mass or more, even more preferably 0.05% by mass or more, still more preferably 0.1% by mass or more, and preferably 20% by mass or less, more preferably 15% by mass or less, even more preferably 10% by mass or less, still more preferably 8% by mass or less, still more preferably 5% by mass or less, and still more preferably 1% by mass or less.

[0043] When compound (1a) and compound (1b) are used as component (A), the compound (1a) is used in an amount of preferably 0.00095% by mass or more, more preferably 0.0075% by mass or more, even more preferably 0.035% by mass or more, still more preferably 0.06% by mass or more, and preferably 3.75% by mass or less, more preferably 3% by mass or less, even more preferably 2.8% by mass or less, still more preferably 2% by mass or less, and still more preferably 1% by mass or less, based on the amount of water in the hydraulic composition. When compound (1a) and compound (1b) are used as component (A), the amount of compound (1b) is preferably 0.00005% by mass or more, more preferably 0.0025% by mass or more, even more preferably 0.015% by mass or more, still more preferably 0.04% by mass or more, and preferably 19% by mass or less, more preferably 11.25% by mass or less, even more preferably 7% by mass or less, still more preferably 5.2% by mass or less, and still more preferably 3% by mass or less, based on the amount of water in the hydraulic composition.

[0044] When compound (1a) and compound (1b) are used as component (A), the mass ratio of compound (1b) / compound (1a) is preferably 5 / 95 or more, more preferably 25 / 75 or more, even more preferably 40 / 60 or more, and is preferably 95 / 5 or less, more preferably 75 / 25 or less, even more preferably 60 / 40 or less.

[0045] The hydraulic composition according to the present invention may contain any component other than water, hydraulic powder, and component (A).

[0046] The hydraulic composition according to the present invention preferably contains (B) an antifoaming agent (hereinafter referred to as component (B)). From the viewpoint of antifoaming properties, component (B) is preferably one or more compounds selected from polysiloxane, polyoxyethylene polyoxypropylene, polypropylene oxide and its derivatives (such as polyoxypropylene and polyoxypropylene glyceryl ether), acetylene glycol and its derivatives (such as acetylene glycol and alkylene oxide adducts of acetylene glycol), polyoxyalkylene fatty acid ester, polyoxyalkylene alkyl ether, polyoxyalkylene alkylamide, trialkyl phosphate, and alcohol. More preferably, these compounds are water-insoluble.

[0047] Examples of polysiloxanes include polysiloxane, dimethylpolysiloxane, and polyhydroxymethylsiloxane.

[0048] Examples of polyoxyethylene polyoxypropylene include polyoxyethylene polyoxypropylene random polymers, polypropylene oxide-polyethylene oxide-polypropylene oxide block polymers, etc. From the viewpoint of defoaming properties, the weight average molecular weight of these is preferably 2,000 or more and 100,000 or less.

[0049] Examples of polypropylene oxide and its derivatives include polyoxypropylene glyceryl ether, polyoxypropylene, etc. The weight average molecular weight of the polypropylene oxide portion is preferably 2,000 or more and 100,000 or less from the viewpoint of defoaming properties.

[0050] Examples of acetylene glycol and its derivatives include commercially available products such as Acetylenol E00 and Acetylenol E13 (both from Kawaken Fine Chemicals Co., Ltd.), DYNOL (registered trademark) 604, SURFYNOL (registered trademark) 440, SURFYNOL (registered trademark) 104, SURFYNOL (registered trademark) 2502, SURFYNOL (registered trademark) 420, and SURFYNOL (registered trademark) DF-75 (all from Air Products and Chemicals Co., Ltd.). Examples of acetylene glycol derivatives include alkylene oxide adducts of acetylene glycol. From the viewpoint of defoaming properties, the average number of moles of alkylene oxide added is preferably 1 or more and 100 or less. The alkylene oxide is preferably propylene oxide.

[0051] Examples of polyoxyalkylene fatty acid esters include alkylene oxide adducts of fatty acids having 4 to 22 carbon atoms. From the viewpoint of antifoaming properties, the average number of moles of alkylene oxide added is preferably 1 or more and 100 or less. From the same viewpoint, the alkylene oxide preferably contains propylene oxide.

[0052] Examples of polyoxyalkylene alkyl ethers include alkylene oxide adducts of alcohols having 4 to 22 carbon atoms. From the viewpoint of antifoaming properties, the average number of moles of alkylene oxide added is preferably 1 or more and 100 or less. From the same viewpoint, the alkylene oxide is preferably propylene oxide. Specific examples include polypropylene glycol lauryl ether, polypropylene glycol myristyl ether, and mixtures thereof.

[0053] Examples of polyoxyalkylene alkylamides include alkylene oxide adducts of amides of fatty acids having 8 to 22 carbon atoms and amines such as monoethanolamine and diethanolamine. From the viewpoint of defoaming properties, the average number of moles of alkylene oxide added is preferably 1 or more and 100 or less. From the same viewpoint, the alkylene oxide is preferably propylene oxide.

[0054] Examples of trialkyl phosphates include tributyl phosphate, triisobutyl phosphate, etc. From the viewpoint of antifoaming properties, the number of carbon atoms in the alkyl group is preferably 1 or more and 5 or less.

[0055] The alcohol may be an alcohol having 4 to 22 carbon atoms, preferably a monohydric alcohol having 4 to 22 carbon atoms. From the viewpoint of antifoaming properties, the alcohol preferably has 6 or more and 18 or less carbon atoms.

[0056] Suitable examples of the defoaming agent include polysiloxanes such as SAG™ 672 and SAGTEX™ DSA (both manufactured by Momentive Performance Materials, Inc.); polyoxyalkylene fatty acid esters, polyoxyalkylene alkyl ethers, or polyoxyalkylene alkyl amides such as polypropylene glycol lauryl ether, polypropylene glycol myristyl ether, and mixtures thereof, propylene oxide-ethylene oxide adduct of oleic acid, SN Defoamer 260™, SN Defoamer 265™, and SN Defoamer 466™ (all manufactured by San Nopco Ltd.), Defoamer No. 21™, and Defoamer No. 22™. Examples of suitable polyoxypropylenes include NO.8 (trademark) (both manufactured by Kao Corporation), acetylene glycols include DYNOL (trademark) 604 and SURFYNOL (registered trademark) 440, trialkyl phosphates include tributyl phosphate and triisobutyl phosphate, alcohols include 2-ethylhexanol, polyoxyethylene polyoxypropylenes include Newpol PE-61 (trademark) and Newpol PE-71 (trademark) (both manufactured by Sanyo Chemical Industries, Ltd.), and polyoxypropylenes include polypropylene glycols having a molecular weight of 2,000 or more and 100,000 or less.

[0057] From the viewpoint of economic efficiency, preferred examples of the defoaming agent include polysiloxanes such as DK Q1-1183 (trademark), polyoxyalkylene fatty acid esters, polyoxyalkylene alkyl ethers, and polyoxyalkylene alkyl amides such as SN Defoamer 260 (trademark), SN Defoamer 265 (trademark), SN Defoamer 466 (trademark), Defoamer No. 21 (trademark), and Defoamer No. 8 (trademark), trialkyl phosphates such as tributyl phosphate and triisobutyl phosphate, alcohols such as 2-ethylhexanol, polyoxyethylene polyoxypropylenes such as Newpol PE-61 (trademark) and Newpol PE-71 (trademark), and polyoxypropylenes such as polypropylene glycols having a molecular weight of 2,000 or more and 100,000 or less.

[0058] When the hydraulic composition according to the present invention contains the component (B), the composition contains the component (B) in an amount of preferably 0.001% by mass or more, more preferably 0.01% by mass or more, even more preferably 0.1% by mass or more, and preferably 20% by mass or less, more preferably 10% by mass or less, and even more preferably 5% by mass or less, relative to the component (A).

[0059] The hydraulic composition according to the present invention may contain (C) an anionic aromatic compound. Examples of component (C) include one or more compounds selected from sulfonic acids having an aromatic ring, carboxylic acids having an aromatic ring, phosphonic acids having an aromatic ring, and salts thereof. The anionic aromatic compound is preferably an acid-type compound having a total carbon number of 6 to 12. Specific examples of the anionic aromatic compound include salicylic acid, p-toluenesulfonic acid, sulfosalicylic acid, benzoic acid, m-sulfobenzoic acid, p-sulfobenzoic acid, 4-sulfophthalic acid, 5-sulfoisophthalic acid, p-phenolsulfonic acid, m-xylene-4-sulfonic acid, cumenesulfonic acid, methylsalicylic acid, styrenesulfonic acid, and chlorobenzoic acid. These may form salts. Two or more types of anionic aromatic compounds may be used. The anionic aromatic compound is preferably one or more compounds selected from sulfonic acids having an aromatic ring, carboxylic acids having an aromatic ring, and salts thereof.

[0060] When component (C) is used, the mass ratio of component (A) / component (C) and further the mass ratio of compound (1) / component (C) are preferably 50 / 50 or more, more preferably 70 / 30 or more, even more preferably 80 / 20 or more, and are preferably 99.9 / 0.1 or less, more preferably 95 / 5 or less.

[0061] The hydraulic composition according to the present invention may optionally contain components such as dispersants, air-entraining agents, retarders, foaming agents, thickeners, foaming agents, waterproofing agents, and fluidizing agents, as long as the effects of the present invention are not adversely affected. The hydraulic composition preferably contains a dispersant. The dispersant is not particularly limited, and dispersants commonly used in hydraulic compositions, such as polycarboxylic acid dispersants, polyether dispersants, naphthalene dispersants, and melamine dispersants, can be used. Dispersants may also be used as water-reducing agents, high-performance water-reducing agents, and high-performance air-entraining water-reducing agents. The dispersants are preferably polycarboxylic acid dispersants or polyether dispersants. The dispersants can be used in amounts known in the art for hydraulic compositions.

[0062] The optional components such as component (B) and component (C) can be added to the hydraulic composition in advance, or can be added when or after adding component (A). Also, the hydraulic composition can be used as a composition containing component (A) and an optional component, for example, component (C).

[0063] The hydraulic composition according to the present invention may contain aggregate. Examples of aggregate include fine aggregate and coarse aggregate. The fine aggregate is preferably mountain sand, land sand, river sand, or crushed sand, and the coarse aggregate is preferably mountain gravel, land gravel, river gravel, or crushed stone. Depending on the application, lightweight aggregate may also be used. The term aggregate is based on "Concrete General Guide" (published by Gijutsu Shoin, June 10, 1998).

[0064] The hydraulic composition according to the present invention may be non-segregating in water. For example, a hydraulic composition being non-segregating in water may be judged to have good non-segregation properties in water (the pH of the supernatant is less than 12) according to the underwater non-segregation test method for underwater non-segregation concrete described in the Draft Guidelines for Design and Construction of Underwater Non-Segregation Concrete published by the Japan Society of Civil Engineers. In the present invention, even a hydraulic composition that has been thickened to a level that allows it to be non-segregating in water can be transported with reduced transport obstructions by combining it with metal piping.

[0065] The material, shape, length, etc. of the metal pipe used in the present invention can be appropriately set based on the use of the hydraulic composition, the transfer conditions (e.g., distance, shape to the transfer point, etc.), etc. The material of the metal pipe may be, for example, a metal selected from stainless steel, aluminum, and cast iron.

[0066] The inner diameter of the metal pipe used in the present invention may be, for example, 10 mm or more, further 13 mm or more, or further 15 mm or more from the viewpoint of pumpability, and may be 200 mm or less, further 100 mm or less, or further 50 mm or less from the viewpoint of economy and productivity. The minimum inner diameter of the metal pipe used in the present invention may be, for example, 200 mm or less, further 100 mm or less, and further 50 mm or less, from the viewpoint of economic efficiency and productivity. The length of the metal pipe used in the present invention is preferably 2 m or more, more preferably 5 m or more, and even more preferably 10 m or more, from the viewpoint of the significant benefit of suppressing adhesion to the metal, and from the viewpoint of pumping, it may be preferably 100 m or less, more preferably 50 m or less, and even more preferably 20 m or less.

[0067] The metal pipes used in the present invention include metal pipes installed in various devices that handle hydraulic compositions such as mortar and concrete, and metal pipes connected to such devices. Examples of such devices include injection devices, mortar pumps, spraying devices, and slurry supply devices. These devices include, for example, hydraulic composition storage means (raw material tanks, storage tanks, hoppers, etc.), hydraulic composition mixing means (mixers, etc.), hydraulic composition transfer means (pumps, etc.), and measurement means (flow meters, etc.), and each means is connected by piping as needed. Metal piping can be used in the present invention. These means may also be equipped with piping, and metal piping can be used in the present invention. In the present invention, the hydraulic composition of the present invention can be passed through the metal pipe while contacting the inner wall, i.e., the metal portion, of the metal pipe.

[0068] The present invention can be used in various operations involving the transfer of hydraulic compositions, such as ground improvement, secondary product manufacturing, and structural repair. For example, a hydraulic composition with an added metal pipe can be released into water. This allows for underwater casting, enabling the intended work to be carried out. The present invention can also be applied to ground improvement aimed at improving the foundation ground of a house, for example, in a columnar ground reinforcement method (also known as a soil cement column method). It can also be used in methods for preventing ground collapse and stabilizing the ground or bedrock after excavation. [Example]

[0069] [Ingredients used] (1)Water tap water (2) Hydraulic powder Ordinary cement (manufactured by Taiheiyo Cement Corporation) (3) Component (A) Oleyldimethylamine oxide Oleic acid amidopropyl dimethylamine oxide (4)(B) Component Antifoaming agent 1: Pronal CA-3000, manufactured by Toho Chemical Industry Co., Ltd. (5)(C) component Sodium m-xylene sulfonate (6) Admixtures Commercially available admixture: Kao Corporation, Mighty 21WH

[0070] [Thickener] Formulations 1 to 3: Thickeners combining components (A) and (C) as shown in Table 1 (% in Table 1 is mass %) Commercially available thickener 1: Asuka Clean (water-soluble cellulose ether), manufactured by Shin-Etsu Chemical Co., Ltd. Commercially available thickener 2: Kao Corporation, Viscotop 200LS-2 (alkyl aryl sulfonate, alkyl ammonium salt)

[0071] [Table 1]

[0072] <Example 1 and Comparative Example 1> (1) Examples 1-1 to 1-4, Comparative Examples 1-1 to 1-2 1800 g of cement, 1440 g of water, and optional admixtures were added to a 5-liter plastic bucket and stirred for 30 seconds with a cooking hand mixer. If the air content exceeded 5%, antifoaming agent 1 was added appropriately to reduce the air content to less than 5%. The specified amounts of thickener and admixture shown in the table were then added and stirred for 1 minute to obtain a cement slurry. The resulting cement slurry was immediately subjected to the prescribed tests after preparation. The amounts of each thickener used in Example 1 and Comparative Example 1 were the amounts (as is) required to achieve underwater non-segregation. Furthermore, Comparative Example 1-1 was adjusted to the recommended amount in the catalog, and Comparative Example 1-2 was adjusted to the minimum amount required to achieve underwater non-segregation. The presence or absence of underwater non-segregation was confirmed according to the underwater non-segregation test method for underwater non-segregation concrete described in the Guidelines for Design and Construction of Underwater Non-Segregation Concrete (Draft) published by the Japan Society of Civil Engineers. According to the guidelines, good underwater non-segregation was confirmed when the pH of the supernatant was less than 12.

[0073] [evaluation] (1) Amount of adhesion to metal piping A P funnel, a stainless steel funnel, and a mortar flow cone were used as models of metal transfer piping. For reference, a PTFE (polytetrafluoroethylene) funnel was used as a model of plastic piping, and the amount of adhesion was measured when cement slurry was passed through it. The measurement of the amount of adhesion for each funnel was carried out as follows.

[0074] (1-1) Measurement of adhesion amount to P funnel The flow time of the cement slurry was measured according to JSCE-F 521-1999 "Test method for fluidity of injection mortar for prepacked concrete (method using P funnel)", and then the bottom was immediately sealed and the total mass was measured. The mass of the P funnel tester (manufactured by Marui Co., Ltd.), which had been measured in advance, was subtracted to obtain the adhesion amount.

[0075] (1-2) Measurement of adhesion amount to stainless steel funnel The cement paste was filled into a cone-shaped funnel (outlet diameter 20 mm, upper opening diameter 103 mm, height 277 mm) made from processed stainless steel, and the cap sealing the bottom was removed to allow the paste to flow. When the paste was viewed from above and a light was seen on the other side from the outlet, the bottom was immediately sealed and the total mass was measured. The mass of the funnel, which had been measured beforehand, was then subtracted to obtain the amount of adhesion.

[0076] (1-3) Measurement of adhesion amount to mortar flow cone A cast iron mortar flow cone was filled with cement slurry, and after the flow cone was removed in accordance with the procedure for measuring flow in accordance with JIS R 5201, its mass was immediately measured, and the mass of the flow cone, which had been measured in advance, was subtracted to obtain the adhesion amount.

[0077] (1-4) Measurement of adhesion amount to PTFE funnel A PTFE funnel (mouth diameter φ156 mm, leg outer diameter φ18 mm, leg length 80 mm) manufactured by AS ONE Corporation was filled to the brim with cement slurry, and after the contents had all poured out, the bottom was immediately sealed and the total mass was measured. The mass of the funnel itself, which had been measured beforehand, was then subtracted to obtain the adhesion amount.

[0078] (3) Flow time and flow velocity test in metal piping A stainless steel pipe with an inner diameter of 18 mm and a length of 1 m was placed vertically, and the bottom end was blocked and then filled to the brim with cement slurry. After removing the blockage from the bottom end, the flow time was determined as the moment when light was visible from the bottom when viewed from above. A similar test was conducted with a stainless steel pipe with an inner diameter of 18 mm and a length of 2 m. The flow rate was calculated by dividing the length of the pipe by the flow time.

[0079] [Table 2]

[0080] Regarding the amount of adhesion to the metal funnel, in Examples 1-1 to 1-4, the amount of adhesion to the metal piping was 39 g or less for the aluminum P funnel, 29 g or less for the stainless steel funnel, and 28 g or less for the cast iron flow cone, whereas in Comparative Example 1-1, the amount of adhesion was high at 81 g for the aluminum P funnel, 176 g for the stainless steel funnel, and 49 g for the cast iron funnel. Also, in Comparative Example 1-2, the amount of adhesion was high at 75 g for the aluminum P funnel. Furthermore, with regard to the flow time in metal pipes of 1 m and 2 m in length, Examples 1-1 to 1-4 had a fast flow rate, and even in 2 m pipes, the flow rate did not deteriorate significantly, and pumping performance was excellent. However, Comparative Example 1-1 had a slow flow rate, and the flow rate did not change even with changes in length. Comparative Example 1-2 had a faster flow rate at 1 m than Comparative Example 1-1, but the flow rate deteriorated significantly when a 2 m stainless steel pipe was used. As described above, even among cement slurries with the same level of underwater separation resistance, the cement slurry containing component (A) adheres less to metal piping, and can be transported stably at a high flow rate even if the metal piping is long. This is an effect that a person skilled in the art would not have predicted from the underwater separation resistance of the hydraulic composition.

[0081] <Example 2 and Comparative Example 2> Cement slurries were prepared in the same manner as in Example 1 and Comparative Example 1, and the same evaluations were carried out. However, the water / hydraulic powder ratio (W / P) of the hydraulic composition was as shown in Table 3, and the adhesion amount was evaluated by measuring the amount of adhesion to a P funnel. Furthermore, the cement slurries were evaluated for pumpability, fluidity, anti-segregation in water, and compressive strength by the following methods. The compressive strength was evaluated for Examples 2-2 and 2-3.

[0082] (1) Pumpability (viscosity) The viscosity of the cement slurry was measured at 20°C using a B-type viscometer (manufactured by RION Corporation, VISCOTESTER VT-04E, rotor No. 1, rotation speed: 62.5 rpm) and used as an index of pumpability.

[0083] (2) Liquidity The flow value (80x80) of the cement slurry was measured according to the Japan Highway Public Corporation standard "Test method for air mortar and air mortar (JHS.A 3113-1992)". In addition, to measure the air flow distance, cement slurry was filled into a water tank with memory (PWS6020) manufactured by AS ONE Corporation from the left end using a funnel (made of polypropylene) so that the height of the toes was 5 cm from the bottom, and the distance it flowed to the right after 5 minutes was measured. In addition, to measure the underwater flow distance, a water tank with a memory (PWS6020) manufactured by AS ONE was filled with 5 L of water in advance, and the cement slurry was poured into the water from the left end using a funnel (made of polypropylene) so that the height of the toes was 5 cm from the bottom, and the distance it flowed to the right after 5 minutes was measured.

[0084] (3) Inseparability in water In the evaluation of fluidity in (2) above, the supernatant after measuring the flow distance in water was collected and the pH and turbidity were measured using a turbidity meter (TN100, manufactured by Nikko Hansen).

[0085] (4) Compressive strength (4-1) 24-hour strength The 24-hour compressive strength (in air) was measured in accordance with JIS A 1108. Three specimens were prepared, and the average value of the three was used as the 24-hour strength.

[0086] (4-2) 28 day strength The 28-day strength in air and underwater was measured in accordance with JSCE-D 104. Three specimens were prepared in air and three in water using a plastic mold with an inner diameter of 50 mm and a height of 100 mm, and the average value of the three specimens was used as the 28-day strength.

[0087] [Table 3]

[0088] It has been found that the cement slurry containing the amine oxide surfactant according to the present invention has a low adhesion amount to metal pipes, has excellent fluidity and underwater separability even when poured underwater, and its strength after hardening does not decrease significantly compared to when hardened in air.

Claims

1. A method for transferring an underwater non-separating hydraulic composition, comprising passing the underwater non-separating hydraulic composition, which contains water, hydraulic powder, and a thickener, through a metal pipe, wherein the metal pipe is made of stainless steel, the length of the metal pipe is 2 m or more, and the thickener is an amine oxide surfactant.

2. 2. The method for transferring an underwater non-segregating hydraulic composition according to claim 1, wherein the underwater non-segregating hydraulic composition that has passed through a metal pipe is released into water.

3. 3. The method for transferring an underwater non-separating hydraulic composition according to claim 1 or 2, wherein the underwater non-separating hydraulic composition has a water / hydraulic powder ratio, which is the mass ratio of water to hydraulic powder, of 30 mass% or more and 200 mass% or less.

4. 4. The method for transferring an underwater non-segregating hydraulic composition according to claim 1, wherein the minimum inner diameter of the metal pipe is 200 mm or less.

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