Dispersant composition for hydraulic composition for centrifugal molding

Abstract

To provide a dispersant composition for a hydraulic composition for centrifugal molding, in which the hydraulic composition exhibits further excellent moldability for a certain period of time (for example, 15 minutes or more and 60 minutes or less) from kneading, and a method for producing the same; and to provide the hydraulic composition for centrifugal molding, in which the hydraulic composition exhibits further excellent moldability for a certain period of time (for example, 15 minutes or more and 60 minutes or less) from kneading, and a method for producing a hardened body of the hydraulic composition.SOLUTION: A dispersant composition for a hydraulic composition for centrifugal molding comprises the following (A) component and water. (A) Component: A copolymer having a molecular weight of 10,000 or more and 70,000 or less, containing as constitutional monomers, a monomer (A1) represented by a general formula (A1), a monomer (A2) represented by a general formula (A2), and a monomer (A3) represented by a general formula (A3). In the constitutional monomers of the copolymer, the monomer (A1) is 30 mol% or more and 70 mol% or less, the monomer (A2) is 10 mol% or more and 50 mol% or less, and the monomer (A3) is 20 mol% or more and 35 mol% or less.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a dispersant composition for a hydraulic composition for centrifugal molding and a method for producing the same, a hydraulic composition for centrifugal molding, and a method for producing a hardened product of the hydraulic composition. [Background technology]

[0002] Centrifugal molding is a known method for producing hollow cylindrical concrete products such as pipes, piles, poles, etc. In this method, mixed concrete material is poured into a formwork, which is then rotated at high speed to generate centrifugal force that presses the concrete against the inner surface of the formwork, thereby compacting it. Forming by centrifugal molding is carried out before the unhardened concrete hardens, but in production lines where high temperatures, tight production schedules, and time is required to prepare the formwork, the time required from mixing to centrifugal molding increases, and it is known that the fluidity of the concrete deteriorates over time, and the concrete does not reach every corner of the formwork, often resulting in poor molding and defects. Therefore, there is a demand for a hydraulic composition for centrifugal molding that exhibits better formability within a certain period of time after mixing (for example, 15 to 60 minutes).

[0003] Patent Document 1 discloses a cement dispersant containing, as an essential component, a copolymer comprising an unsaturated (poly)alkylene glycol ether monomer represented by general formula (1) and a structural unit derived from an unsaturated monocarboxylic acid monomer represented by general formula (2), wherein the structural unit contains at least a structure derived from acrylic acid (salt). Patent Document 2 discloses a cement dispersant containing, as an essential component, a copolymer comprising a structural unit (III) derived from a specific unsaturated polyalkylene glycol ether monomer (a2) and a structural unit (II) derived from a specific unsaturated monocarboxylic acid monomer (b), wherein the structural unit (III) accounts for 50 mol% or less of all structural units of the copolymer, the structural unit (II) contains at least a structure derived from methacrylic acid (salt), and the number of carboxyl group milliequivalents when all carboxyl groups in the copolymer are converted to unneutralized types is 3.30 meq or less per 1 g of the copolymer. Patent Document 3 discloses a dispersant for hydraulic compositions containing a copolymer obtained by polymerizing a monomer containing a specific monomer 1 represented by general formula (1) and a specific monomer 2 represented by general formula (2) with a specific monomer 3 represented by general formula (3), wherein the ratios of the monomer 1, the monomer 2, and the monomer 3 among the constituent monomers of the copolymer are each within a specific range. Patent Document 4 discloses a dispersion-retaining agent for hydraulic compositions, which comprises a copolymer having a weight-average molecular weight of 30,000 to 60,000 obtained by polymerizing specific monomer 1 represented by general formula (1), specific monomer 2 represented by general formula (2), and specific monomer 3 represented by general formula (3), in which the constituent monomers of the copolymer are 25 to 78% by weight of monomer 1 and 0 to 18% by weight of monomer 3. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-121055 [Patent Document 2] Japanese Patent Application Laid-Open No. 2002-348161 [Patent Document 3] Japanese Patent Application Laid-Open No. 2009-96672 [Patent Document 4] Japanese Patent Application Laid-Open No. 2009-221025 Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention provides a dispersant composition for a hydraulic composition for centrifugal molding, which allows the hydraulic composition to exhibit better moldability for a certain period of time (for example, 15 minutes or more and 60 minutes or less) after kneading, a method for producing the same, a hydraulic composition for centrifugal molding, which allows the hydraulic composition to exhibit better moldability for a certain period of time (for example, 15 minutes or more and 60 minutes or less) after kneading, and a method for producing a hardened hydraulic composition. [Means for solving the problem]

[0006] The present invention relates to a dispersant composition for a hydraulic composition for centrifugal molding, which contains the following component (A) and water: Component (A): A copolymer (A) containing, as constituent monomers, a monomer (A1) represented by the following general formula (A1), a monomer (A2) represented by the following general formula (A2), and a monomer (A3) represented by the following general formula (A3), and having a weight average molecular weight of 10,000 to 70,000, wherein, of the constituent monomers of the copolymer, the monomer (A1) accounts for 30 mol % to 70 mol %, the monomer (A2) accounts for 10 mol % to 50 mol %, and the monomer (A3) accounts for 20 mol % to 35 mol %.

[0007] [ka]

[0008] [During the ceremony, R 11a , R 12a , R 13a may be the same or different, and may be a hydrogen atom, a methyl group, or (CH2) r COOM 2a and (CH2) r COOM 2a COOM 1a or other (CH2) r COOM 2a and an anhydride may be formed, in which case the M 1a , M 2adoes not exist. M 1a , M 2a : may be the same or different, and may be a hydrogen atom, an alkali metal, an alkaline earth metal (1 / 2 atom), an ammonium group, an alkylammonium group, or a substituted alkylammonium group r: a number between 0 and 2 indicates.]

[0009] [ka] [During the ceremony, R 21a , R 22a may be the same or different, and may be a hydrogen atom or a methyl group R 23a : Hydrogen atom or -COO(AO) n X 1a X 1a : an alkyl group having 1 to 4 carbon atoms or a hydrogen atom AO: a group selected from an ethyleneoxy group and a propyleneoxy group n: average number of moles of AO added, a number of 5 to 70 p: a number between 0 and 2 q: the number 0 or 1 indicates.]

[0010] [ka]

[0011] [During the ceremony, R 31a : a hydrocarbon group having 1 to 4 carbon atoms which may contain a heteroatom indicates.]

[0012] The present invention also relates to a method for producing a dispersant composition for a hydraulic composition for centrifugal molding, which comprises mixing the component (A) with water.

[0013] The present invention also relates to a hydraulic composition for centrifugal molding, which contains the component (A), hydraulic powder, aggregate, and water.

[0014] The present invention also relates to a method for producing a hardened hydraulic composition, which comprises the following steps: Step 1: A step of mixing the component (A), hydraulic powder, aggregate, and water to obtain a hydraulic composition, and filling the obtained hydraulic composition into a formwork. Step 2: A step of clamping the hydraulic composition filled in the form obtained in step 1 by applying centrifugal force. Step 3: A step of allowing the clamped hydraulic composition obtained in step 2 to set in the formwork. [Effects of the Invention]

[0015] According to the present invention, there are provided a dispersant composition for hydraulic compositions for centrifugal molding, which allows the hydraulic composition to exhibit better moldability for a certain period of time after kneading, a method for producing the same, a hydraulic composition for centrifugal molding, which allows the hydraulic composition to exhibit better moldability for a certain period of time after kneading, and a method for producing a hardened hydraulic composition. This certain period of time is, for example, from 15 to 60 minutes after kneading (meaning from the time when water first comes into contact with the hydraulic powder; the same applies hereinafter). DETAILED DESCRIPTION OF THE INVENTION

[0016] The present inventors have found that when a dispersant composition for hydraulic compositions for centrifugal molding containing component (A), which is a copolymer containing the monomer (A1), the monomer (A2), and the monomer (A3) as constituent monomers in a specific ratio, is used in a hydraulic composition for centrifugal molding, the moldability of the hydraulic composition is improved for a certain period of time (for example, 15 minutes or more and 60 minutes or less) after kneading. The reason why such an effect is exhibited is not entirely clear, but is presumed to be as follows. Component (A), a copolymer containing the monomers (A1), (A2), and (A3) in a specific ratio as constituent monomers, exhibits low adsorption to cement particles at the beginning of mixing, resulting in a larger amount of component (A) remaining in the bulk water than with typical polycarboxylic acid dispersants. This remaining component (A) gradually adsorbs to the cement particles over time, maintaining the dispersion of the cement particles and the fluidity of the concrete, which is thought to result in the hydraulic composition exhibiting superior formability for a certain period of time (e.g., 15 to 60 minutes) after mixing.

[0017] [Dispersant composition] The present invention provides a dispersant composition for a hydraulic composition for centrifugation, which contains component (A) and water.

[0018] <Component (A)> The component (A) is a copolymer having a weight average molecular weight of 10,000 to 70,000, which contains, as constituent monomers, a monomer (A1) represented by the following general formula (A1), a monomer (A2) represented by the following general formula (A2), and a monomer (A3) represented by the following general formula (A3), wherein, of the constituent monomers of the copolymer, the monomer (A1) accounts for 30 mol % to 70 mol %, the monomer (A2) accounts for 10 mol % to 50 mol %, and the monomer (A3) accounts for 20 mol % to 35 mol %.

[0019] [ka]

[0020] [During the ceremony, R 11a , R 12a , R 13a may be the same or different, and may be a hydrogen atom, a methyl group, or (CH2) r COOM 2a and (CH2) r COOM 2a COOM 1a or other (CH2) r COOM 2aand an anhydride may be formed, in which case the M 1a , M 2a does not exist. M 1a , M 2a : may be the same or different, and may be a hydrogen atom, an alkali metal, an alkaline earth metal (1 / 2 atom), an ammonium group, an alkylammonium group, or a substituted alkylammonium group r: a number between 0 and 2 indicates.]

[0021] [ka] [During the ceremony, R 21a , R 22a may be the same or different, and may be a hydrogen atom or a methyl group R 23a : Hydrogen atom or -COO(AO) n X 1a X 1a : an alkyl group having 1 to 4 carbon atoms or a hydrogen atom AO: a group selected from an ethyleneoxy group and a propyleneoxy group n: average number of moles of AO added, a number of 5 to 70 p: a number between 0 and 2 q: the number 0 or 1 indicates.]

[0022] [ka]

[0023] [During the ceremony, R 31a : a hydrocarbon group having 1 to 4 carbon atoms which may contain a heteroatom indicates.]

[0024] In general formula (A1), R 11a is preferably a hydrogen atom from the viewpoint of stability of centrifugal compactibility over time. In general formula (A1), R 12aFrom the viewpoint of stability of centrifugal compactibility over time, is preferably a methyl group or a hydrogen atom, and more preferably a hydrogen atom. In general formula (A1), R 13a is preferably a hydrogen atom. (CH2) r COOM 2a About COOM 1a or other (CH2) r COOM 2a and an anhydride may be formed, in which case the M 1a , M 2a does not exist. Regarding the copolymer (A), from the viewpoint of stability of centrifugal moldability over time, M 1a , M 2a may be the same or different, and each is preferably a hydrogen atom. (CH2) in general formula (A1) r COOM 2a The value of r is preferably 1 from the viewpoint of stability of centrifugal compactibility over time.

[0025] In general formula (A2), R 21a is preferably a hydrogen atom from the viewpoint of stability of centrifugal compactibility over time. In general formula (A2), R 22a From the viewpoint of stability of centrifugal compactibility over time, a methyl group is preferred. In general formula (A2), R 23a is preferably a hydrogen atom from the viewpoint of stability of centrifugal compactibility over time. In general formula (A2), X 1a is preferably a methyl group or a hydrogen atom from the viewpoint of stability of centrifugal compactibility over time. In general formula (A2), AO is preferably an ethyleneoxy group from the viewpoint of stability of centrifugal compactibility over time. AO preferably contains an ethyleneoxy group.

[0026] In general formula (A2), n is the average number of moles of AO added and is a number from 5 to 70. From the viewpoints of workability, dispersibility, and stability of centrifugal moldability over time, n is preferably a number of 10 or more, more preferably 15 or more, even more preferably 20 or more, still more preferably 25 or more, still more preferably 30 or more, still more preferably 35 or more, still more preferably 40 or more, still more preferably 45 or more, still more preferably 50 or more, and preferably 65 or less, more preferably 60 or less.

[0027] In general formula (A2), p is preferably 1 or 2 from the viewpoint of stability of centrifugal compactibility over time. In general formula (A2), q is preferably 0 from the viewpoint of stability of centrifugal compactibility over time.

[0028] In general formula (A3), R 31a is a hydrocarbon group having 1 or more carbon atoms, preferably 2 or more carbon atoms, and which may contain 4 or less heteroatoms, preferably 3 or less heteroatoms. The heteroatoms are oxygen atoms, nitrogen atoms, etc.

[0029] Examples of the monomer (A3) include one or more selected from methyl acrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 3-hydroxypropyl acrylate, methoxyethyl acrylate, and n-butyl acrylate. From the viewpoint of stability of centrifugal moldability over time, one or more selected from methyl acrylate, 2-hydroxyethyl acrylate, and 2-hydroxypropyl acrylate are preferred.

[0030] Among the constituent monomers of the copolymer (A), The content of the monomer (A1) is 30 mol% or more, preferably 40 mol% or more, more preferably 50 mol% or more, and 70 mol% or less, preferably 65 mol% or less, more preferably 60 mol% or less, from the viewpoints of fluidity immediately after kneading and stability of centrifugal moldability over time. the content of the monomer (A2) is 10 mol% or more, preferably 14 mol% or more, and 50 mol% or less, preferably 45 mol% or less, more preferably 40 mol% or less, even more preferably 30 mol% or less, still more preferably 25 mol% or less, and still more preferably 20 mol% or less, from the viewpoints of fluidity and stability of centrifugal moldability over time; From the viewpoint of stability of centrifugal moldability over time, the content of the monomer (A3) is 20 mol % or more, preferably 25 mol % or more, more preferably 30 mol % or more and 35 mol % or less.

[0031] From the viewpoints of fluidity and stability of centrifugal moldability over time, the total amount of monomers (A1), (A2) and (A3) among the constituent monomers of copolymer (A) is 90 mol% or more, preferably 92 mol% or more, more preferably 95 mol% or more and 100 mol% or less. This total amount may be 100 mol%.

[0032] From the viewpoints of fluidity and workability, the weight-average molecular weight of the copolymer (A) is preferably 10,000 or more, more preferably 15,000 or more, even more preferably 20,000 or more, and preferably 100,000 or less, more preferably 70,000 or less, even more preferably 50,000 or less. This weight-average molecular weight is measured by gel permeation chromatography (GPC) under the following conditions. *GPC conditions Apparatus: GPC (HLC-8320GPC) manufactured by Tosoh Corporation Column: G4000PWXL + G2500PWXL (Tosoh Corporation) Eluent: 0.2M phosphate buffer / CH3CN=9 / 1 Flow rate: 1.0mL / min Column temperature: 40℃ Detection: RI Sample size: 0.2 mg / mL Standard substance: Polyethylene glycol equivalent (monodisperse polyethylene glycol: molecular weight 87,500, 250,000, 145,000, 46,000, 24,000)

[0033] From the viewpoint of stability of centrifugal compactibility over time, the dispersant composition for hydraulic compositions for centrifugal compaction of the present invention contains component (A) in an amount of preferably 1% by mass or more, more preferably 10% by mass or more, even more preferably 20% by mass or more, and preferably 60% by mass or less, more preferably 50% by mass or less, even more preferably 40% by mass or less.

[0034] <(B) component> From the viewpoint of fluidity and stability of centrifugal compactibility over time, the dispersant composition for hydraulic compositions for centrifugal compaction of the present invention preferably further contains the following component (B). Component (B): A copolymer having a molecular weight of 10,000 or more and 70,000 or less, which contains, as constituent monomers, a monomer (B1) represented by the following general formula (B1) and a monomer (B2) represented by the following general formula (B2), in which, of the constituent monomers of the copolymer, the monomer (B1) accounts for 70 mol % or more and 99 mol % or less, and the monomer (B2) accounts for 1 mol Copolymer (B) having a molecular weight of 1000 to 3000 mol%.

[0035] [ka]

[0036] [During the ceremony, R 11b , R 12b , R 13b may be the same or different, and may be a hydrogen atom, a methyl group, or (CH2) r’ COOM 2b and (CH2) r COOM 2b COOM 1b or other (CH2) r’ COOM 2b and an anhydride may be formed, in which case the M 1b , M 2b does not exist. M 1b , M 2b: may be the same or different, and may be a hydrogen atom, an alkali metal, an alkaline earth metal (1 / 2 atom), an ammonium group, an alkylammonium group, or a substituted alkylammonium group r': a number between 0 and 2 indicates.]

[0037] [ka]

[0038] [During the ceremony, R 21b , R 22b may be the same or different, and may be a hydrogen atom or a methyl group R 23b : Hydrogen atom or -COO(AO) n’ X 1b X 1b : an alkyl group having 1 to 4 carbon atoms or a hydrogen atom AO: a group selected from an ethyleneoxy group and a propyleneoxy group n': average number of moles of AO added, a number of 5 or more and 100 or less p': a number between 0 and 2 q': the number 0 or 1 indicates.]

[0039] In general formula (B1), R 11b is preferably a hydrogen atom from the viewpoint of stability of centrifugal compactibility over time. In general formula (B1), R 12b is preferably a methyl group or a hydrogen atom from the viewpoint of stability of centrifugal compactibility over time. In general formula (B1), R 13b is preferably a hydrogen atom from the viewpoint of stability of centrifugal compactibility over time. (CH2) r’ COOM 2b About COOM 1b or other (CH2) r’ COOM 2b and an anhydride may be formed, in which case the M 1b , M 2bdoes not exist. Regarding the copolymer (B), from the viewpoint of stability of centrifugal moldability over time, M 1b , M 2b may be the same or different, and each is preferably a hydrogen atom. (CH2) in general formula (B1) r’ COOM 2b In view of the stability of centrifugal compaction over time, r' is preferably 1.

[0040] In general formula (B2), R 21b is preferably a hydrogen atom from the viewpoint of stability of centrifugal compactibility over time. In general formula (B2), R 22b From the viewpoint of stability of centrifugal compactibility over time, a methyl group is preferred. In general formula (B2), R 23b is preferably a hydrogen atom from the viewpoint of stability of centrifugal compactibility over time. In general formula (B2), X 1b is preferably a methyl group or a hydrogen atom from the viewpoint of stability of centrifugal compactibility over time. In general formula (B2), AO is preferably an ethyleneoxy group from the viewpoint of stability of centrifugal compactibility over time. AO preferably contains an ethyleneoxy group.

[0041] In general formula (B2), n' is the average number of moles of AO added, and is a number from 5 to 100. From the viewpoints of flowability, workability, and stability of centrifugal compactibility over time, n' is preferably a number of 10 or more, more preferably 20 or more, and preferably 80 or less, more preferably 60 or less.

[0042] In general formula (A2), p' is preferably 1 or 2 from the viewpoint of stability of centrifugal compactibility over time. In general formula (A2), q' is preferably 0 from the viewpoint of stability of centrifugal compactibility over time.

[0043] Among the constituent monomers of the copolymer (B), the monomer (B1) is 70 mol% or more, preferably more than 70 mol%, more preferably 72 mol% or more, even more preferably 75 mol% or more, and 99 mol% or less, preferably 92 mol% or less, more preferably 85 mol% or less, from the viewpoints of fluidity, workability, and stability of centrifugal moldability over time; From the viewpoints of flowability, workability, and stability of centrifugal moldability over time, the content of the monomer (B2) is 1 mol% or more, preferably 8 mol% or more, more preferably 15 mol% or more, and 30 mol% or less, preferably 28 mol% or less, more preferably 25 mol% or less.

[0044] From the viewpoints of fluidity and stability of centrifugal moldability over time, the total amount of monomer (B1) and monomer (B2) among the constituent monomers of copolymer (B) is 90 mol% or more, preferably 92 mol% or more, more preferably 95 mol% or more, and 100 mol% or less. This total amount may be 100 mol%.

[0045] From the viewpoints of fluidity and workability, the weight-average molecular weight of the copolymer (B) is preferably 10,000 or more, more preferably 15,000 or more, even more preferably 20,000 or more, and preferably 100,000 or less, more preferably 70,000 or less, even more preferably 50,000 or less. This weight-average molecular weight is measured by gel permeation chromatography (GPC) under the following conditions. *GPC conditions Apparatus: GPC (HLC-8320GPC) manufactured by Tosoh Corporation Column: G4000PWXL + G2500PWXL (Tosoh Corporation) Eluent: 0.2M phosphate buffer / CH3CN=9 / 1 Flow rate: 1.0mL / min Column temperature: 40℃ Detection: RI Sample size: 0.2 mg / mL Standard substance: Polyethylene glycol equivalent (monodisperse polyethylene glycol: molecular weight 87,500, 250,000, 145,000, 46,000, 24,000)

[0046] The dispersant composition for hydraulic compositions for centrifugal compaction of the present invention contains component (B) in an amount of preferably 1% by mass or more, more preferably 10% by mass or more, even more preferably 20% by mass or more, and preferably 50% by mass or less, more preferably 40% by mass or less, even more preferably 30% by mass or less, from the viewpoints of fluidity, workability, and stability of centrifugal compaction over time.

[0047] In the dispersant composition for hydraulic compositions for centrifugal compaction of the present invention, the total content of components (A) and (B) is preferably 2% by mass or more, more preferably 10% by mass or more, even more preferably 20% by mass or more, and preferably 60% by mass or less, more preferably 55% by mass or less, even more preferably 50% by mass or less, from the viewpoint of stability of centrifugal compaction over time.

[0048] In the dispersant composition for hydraulic compositions for centrifugal compaction of the present invention, the mass ratio (B) / (A) of the content of component (A) to the content of component (B) is preferably 0.02 or more, more preferably 0.1 or more, even more preferably 0.2 or more, even more preferably 0.5 or more, from the viewpoints of fluidity and stability of centrifugal compaction over time, and is preferably 10 or less, more preferably 5 or less, even more preferably 3 or less, still more preferably 2.5 or less, still more preferably 2 or less, still more preferably 1.5 or less, and even more preferably 1 or less.

[0049] <(C) component> The dispersant composition for a hydraulic composition for centrifugal compaction of the present invention preferably further contains the following component (C) from the viewpoint of strength development and stability of centrifugal compaction over time. (C) Component: Hydroxycarboxylic acid

[0050] The hydroxycarboxylic acid of component (C) may be one or more selected from lactic acid, citric acid, tartaric acid, and gluconic acid. From the viewpoints of strength development and stability of centrifugal formability over time, one or more selected from lactic acid, citric acid, and gluconic acid is more preferred, and one or more selected from lactic acid and gluconic acid is even more preferred.

[0051] The dispersant composition for hydraulic compositions for centrifugal compaction of the present invention contains component (C) in an amount of preferably 0.0001% by mass or more, more preferably 0.001% by mass or more, even more preferably 0.01% by mass or more, and preferably 10% by mass or less, more preferably 5% by mass or less, even more preferably 1% by mass or less, from the viewpoints of strength development and stability of centrifugal compaction over time.

[0052] In the dispersant composition for hydraulic compositions for centrifugal compaction of the present invention, the total content of components (A), (B), and (C) is preferably 2% by mass or more, more preferably 10% by mass or more, even more preferably 20% by mass or more, and preferably 60% by mass or less, more preferably 55% by mass or less, even more preferably 50% by mass or less, from the viewpoints of fluidity and stability of centrifugal compaction over time.

[0053] In the dispersant composition for hydraulic compositions for centrifugal compaction of the present invention, the mass ratio of the total content of components (A) and (B) to the content of component (C), [(A) + (B)] / (C), is preferably 1 or more, more preferably 5 or more, even more preferably 10 or more, still more preferably 15 or more, and is preferably 100 or less, more preferably 50 or less, and even more preferably 25 or less, from the viewpoints of fluidity and stability of centrifugal compaction over time.

[0054] From the viewpoint of stability of centrifugal compactibility over time, the dispersant composition for hydraulic compositions for centrifugal compaction of the present invention contains water in an amount of preferably 10% by mass or more, more preferably 12% by mass or more, even more preferably 14% by mass or more, and preferably 30% by mass or less, more preferably 28% by mass or less, even more preferably 25% by mass or less.

[0055] The dispersant composition for hydraulic compositions for centrifugal molding of the present invention can contain conventional cement dispersants, water-soluble polymer compounds, air-entraining agents, cement wetting agents, expansive agents, waterproofing agents, retarders, quick-setting agents, thickeners, flocculants, drying shrinkage-reducing agents, strength enhancers, hardening accelerators, preservatives, antifoaming agents, and other components (excluding those corresponding to components (A), (B), and (C)).

[0056] [Method for producing dispersant composition] The present invention provides a method for producing a dispersant composition for hydraulic compositions for centrifugal molding, which comprises mixing component (A) with water. By this production method, the dispersant composition for hydraulic compositions for centrifugal molding of the present invention, which contains component (A) and water, is produced. The method for producing a dispersant composition for hydraulic compositions for centrifugal molding of the present invention preferably further comprises mixing the component (B). That is, the present invention provides a method for producing a dispersant composition for hydraulic compositions for centrifugal molding, which comprises mixing the component (A), the component (B), and water. This production method produces the dispersant composition for hydraulic compositions for centrifugal molding of the present invention, which contains the component (A), the component (B), and water. The method for producing a dispersant composition for hydraulic compositions for centrifugal molding of the present invention preferably further comprises mixing the component (C). That is, the present invention provides a method for producing a dispersant composition for hydraulic compositions for centrifugal molding, which comprises mixing the components (A), (B), (C), and water. This production method produces the dispersant composition for hydraulic compositions for centrifugal molding of the present invention, which contains the components (A), (B), (C), and water.

[0057] Specific examples and preferred embodiments of the components (A), (B), and (C) used in the method for producing a dispersant composition for hydraulic compositions for centrifugal molding of the present invention are the same as those described for the dispersant composition for hydraulic compositions for centrifugal molding of the present invention. The matters described in relation to the dispersant composition for hydraulic compositions for centrifugal molding of the present invention can be appropriately applied to the method for producing the dispersant composition for hydraulic compositions for centrifugal molding of the present invention. In the method for producing a dispersant composition for hydraulic compositions for centrifugal molding of the present invention, the contents of the components and their mass ratios described in the dispersant composition for hydraulic compositions for centrifugal molding of the present invention can be appropriately applied by replacing the contents of the components with the mixing amounts.

[0058] [Hydraulic composition] The present invention provides a hydraulic composition for centrifugal molding, which contains component (A), hydraulic powder, aggregate, and water. The hydraulic composition for centrifugal molding of the present invention preferably further contains the component (B). That is, the present invention provides a hydraulic composition for centrifugal molding containing the component (A), the component (B), hydraulic powder, aggregate, and water. The hydraulic composition for centrifugal molding of the present invention preferably further contains the component (C). That is, the present invention provides a hydraulic composition for centrifugal molding containing the components (A), (B), and (C), hydraulic powder, aggregate, and water.

[0059] Specific examples and preferred embodiments of the components (A), (B), and (C) used in the hydraulic composition for centrifugal molding of the present invention are the same as those described for the dispersant composition for hydraulic compositions for centrifugal molding of the present invention. The matters described in relation to the dispersant composition for a hydraulic composition for centrifugal molding of the present invention and the method for producing the same can be appropriately applied to the hydraulic composition for centrifugal molding of the present invention.

[0060] <Hydraulic powder> The hydraulic powder used in the hydraulic composition for centrifugal molding of the present invention is a powder having the physical property of hardening by hydration, and examples thereof include cement, gypsum, etc. Preferred examples include ordinary portland cement, belite cement, moderate-heat cement, early-strength cement, ultra-early-strength cement, and sulfate-resistant cement. Blast-furnace slag cement, fly ash cement, silica fume, stone powder (calcium carbonate powder), etc. may also be added to these to produce blast-furnace slag cement, fly ash cement, silica fume cement, etc. The hydraulic compositions finally obtained by adding sand, sand, and gravel as aggregate to these powders are generally called mortar, concrete, etc.

[0061] <Aggregate> The hydraulic composition for centrifugal compaction of the present invention contains aggregate. Examples of aggregates include those selected from fine aggregates and coarse aggregates. Examples of fine aggregates include those specified under number 2311 in JIS A0203-2014. Examples of fine aggregates 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 aggregates (artificial and natural), and recycled fine aggregate. Examples of coarse aggregates include those specified under number 2312 in JIS A0203-2014. Examples of coarse aggregates 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 aggregates (artificial and natural), and recycled coarse aggregate. Different types of fine aggregates and coarse aggregates may be used in combination, or a single type may be used.

[0062] <Composition of hydraulic composition> In the hydraulic composition for centrifugal compaction of the present invention, the content of component (A) is, from the viewpoints of fluidity and stability of centrifugal compaction over time, preferably 0.1 part by mass or more, more preferably 0.2 part by mass or more, even more preferably 0.3 part by mass or more, and preferably 10 parts by mass or less, more preferably 8 parts by mass or less, even more preferably 6 parts by mass or less, still more preferably 3 parts by mass or less, still more preferably 1 part by mass or less, still more preferably 0.75 parts by mass or less, and still more preferably 0.5 parts by mass or less, relative to 100 parts by mass of hydraulic powder.

[0063] In the hydraulic composition for centrifugal compaction of the present invention, the content of component (B) is, from the viewpoints of fluidity and stability of centrifugal compaction over time, preferably 0.01 part by mass or more, more preferably 0.1 part by mass or more, even more preferably 0.2 part by mass or more, and preferably 10 parts by mass or less, more preferably 8 parts by mass or less, even more preferably 6 parts by mass or less, still more preferably 3 parts by mass or less, still more preferably 1 part by mass or less, still more preferably 0.75 parts by mass or less, and still more preferably 0.5 parts by mass or less, relative to 100 parts by mass of hydraulic powder.

[0064] In the hydraulic composition for centrifugal compaction of the present invention, the total content of components (A) and (B) is, from the viewpoints of fluidity and stability of centrifugal compaction over time, preferably 0.1 part by mass or more, more preferably 0.2 part by mass or more, even more preferably 0.3 part by mass or more, and preferably 10 parts by mass or less, more preferably 8 parts by mass or less, even more preferably 6 parts by mass or less, still more preferably 3 parts by mass or less, and still more preferably 1 part by mass or less, per 100 parts by mass of hydraulic powder.

[0065] In the hydraulic composition for centrifugal molding of the present invention, the mass ratio (B) / (A) of the content of component (A) to the content of component (B) is preferably 0.02 or more, more preferably 0.1 or more, even more preferably 0.2 or more, even more preferably 0.5 or more, from the viewpoints of fluidity and stability of centrifugal moldability over time, and is preferably 10 or less, more preferably 5 or less, even more preferably 3 or less, still more preferably 2.5 or less, still more preferably 2 or less, still more preferably 1.5 or less, and still more preferably 1 or less.

[0066] In the hydraulic composition for centrifugal compaction of the present invention, the content of component (C) is, from the viewpoint of stability of centrifugal compaction over time, preferably 0.00001 part by mass or more, more preferably 0.0001 part by mass or more, even more preferably 0.001 part by mass or more, still more preferably 0.01 part by mass or more, and preferably 1 part by mass or less, more preferably 0.5 part by mass or less, even more preferably 0.1 part by mass or less, and still more preferably 0.05 part by mass or less, per 100 parts by mass of hydraulic powder.

[0067] In the hydraulic composition for centrifugal compaction of the present invention, the total content of components (A), (B), and (C) is, from the viewpoints of fluidity and stability of centrifugal compaction over time, preferably 0.1 part by mass or more, more preferably 0.2 part by mass or more, even more preferably 0.3 part by mass or more, and preferably 10 parts by mass or less, more preferably 8 parts by mass or less, even more preferably 6 parts by mass or less, still more preferably 3 parts by mass or less, and still more preferably 1 part by mass or less, relative to 100 parts by mass of hydraulic powder.

[0068] In the hydraulic composition for centrifugal molding of the present invention, the mass ratio of the total content of components (A) and (B) to the content of component (C), [(A) + (B)] / (C), is preferably 1 or more, more preferably 5 or more, even more preferably 10 or more, still more preferably 15 or more, and is preferably 100 or less, more preferably 50 or less, and even more preferably 25 or less, from the viewpoints of fluidity and stability of centrifugal moldability over time.

[0069] The hydraulic composition for centrifugal compaction of the present invention has a water / hydraulic powder ratio (hereinafter sometimes referred to as W / P) of preferably 10% by mass or more, more preferably 12% by mass or more, even more preferably 14% by mass or more, from the viewpoints of centrifugal compaction property and strength, and preferably 30% by mass or less, more preferably 25% by mass or less, even more preferably 24% by mass or less, even more preferably 23% by mass or less, and even more preferably 22% by mass or less. Here, the water / hydraulic powder ratio is the mass percentage (mass%) of water to hydraulic powder in the hydraulic composition, and is calculated by multiplying water / hydraulic powder by 100. The water / hydraulic powder ratio is calculated based on the amount of powder that has the physical property of hardening by hydration reaction. When the powder that has 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. The same applies to other quantitative relationships of the hydraulic composition regarding the hydraulic powder.

[0070] When the hydraulic composition for centrifugal molding is concrete, the amount of coarse aggregate used is preferably 50% or more, more preferably 55% or more, even more preferably 60% or more, and preferably 100% or less, more preferably 90% or less, even more preferably 80% or less, from the viewpoints of developing the strength of the hydraulic composition, reducing the amount of hydraulic powder such as cement used, and improving the fillability into forms, etc. The bulk volume is preferably 50% or more, more preferably 55% or more, even more preferably 60% or more, and is preferably 100% or less, more preferably 90% or less, even more preferably 80% or less, from the viewpoints of improving the fillability into forms, etc. 3 It is the ratio of the volume of coarse aggregate (including voids) in the concrete. When the hydraulic composition for centrifugal molding is concrete, the amount of fine aggregate used is preferably 500 kg / m from the viewpoint of improving the filling property into a formwork or the like. 3 More preferably, 600 kg / m 3 More preferably, 700 kg / m 3 and preferably 1000 kg / m 3 Less than or equal to 900 kg / m 3 The following is the result. When the hydraulic composition for centrifugal molding is mortar, the amount of fine aggregate used is preferably 800 kg / m 3 More preferably, 900 kg / m 3 More preferably, 1000 kg / m 3 and preferably 2000 kg / m 3 or less, more preferably 1800 kg / m 3 or less, more preferably 1700 kg / m 3 The following is the result.

[0071] Examples of the hydraulic composition for centrifugal molding include concrete. Among them, concrete using cement is preferred. The hydraulic composition of the present invention is useful in any field such as self-leveling, refractories, plaster, lightweight or heavy-duty concrete, air-entraining, repair, prepacked, tremical, ground improvement, grout, and cold weather use.

[0072] The hydraulic composition for centrifugal molding of the present invention may also contain an early strength agent such as glycerin or N-methyldiethanolamine, or a chelating agent such as ethylenediaminetetraacetic acid sodium salt. From the viewpoint of strength development after steam curing, the content of the chelating agent is preferably 0.1 parts by mass or less per 100 parts by mass of the total of the hydraulic powder and the high-strength admixture containing silica.

[0073] The hydraulic composition for centrifugal molding of the present invention can contain conventional components such as cement dispersants, water-soluble polymer compounds, air-entraining agents, cement wetting agents, expansive agents, waterproofing agents, retarders, quick-setting agents, foaming agents, foaming agents, waterproofing agents, fluidizing agents, thickeners, flocculants, drying shrinkage-reducing agents, strength enhancers, hardening accelerators, preservatives, and antifoaming agents (excluding those corresponding to components (A), (B), and (C)).

[0074] [Method for producing hydraulic composition] The present invention provides a method for producing a hydraulic composition for centrifugal compaction, which comprises mixing component (A), hydraulic powder, aggregate, and water. This method produces the hydraulic composition for centrifugal compaction of the present invention, which contains component (A), hydraulic powder, aggregate, and water. The method for producing a hydraulic composition for centrifugal compaction of the present invention preferably further comprises mixing component (B). That is, the present invention provides a method for producing a hydraulic composition for centrifugal compaction by mixing component (A), component (B), hydraulic powder, aggregate, and water. This method produces the hydraulic composition for centrifugal compaction of the present invention, which contains component (A), component (B), hydraulic powder, aggregate, and water. The method for producing a hydraulic composition for centrifugal compaction of the present invention preferably further comprises mixing component (C). That is, the present invention provides a method for producing a hydraulic composition for centrifugal compaction by mixing components (A), (B), (C), hydraulic powder, aggregate, and water. This method produces the hydraulic composition for centrifugal compaction of the present invention, which contains components (A), (B), (C), hydraulic powder, aggregate, and water.

[0075] Specific examples and preferred embodiments of the components (A), (B), and (C) used in the method for producing a hydraulic composition for centrifugal molding of the present invention are the same as those described for the dispersant composition for a hydraulic composition for centrifugal molding of the present invention. Specific examples and preferred embodiments of the hydraulic powder and aggregate used in the method for producing the hydraulic composition for centrifugal compaction of the present invention are the same as those described for the hydraulic composition for centrifugal compaction of the present invention. The hydraulic powder is used so that the W / P ratio falls within the range described for the hydraulic composition for centrifugal compaction of the present invention. The amount of aggregate used is also the same as that described for the hydraulic composition for centrifugal compaction of the present invention. In the method for producing the hydraulic composition for centrifugal molding of the present invention, the contents of the components and their mass ratios described for the hydraulic composition for centrifugal molding of the present invention can be appropriately applied by replacing the contents of the components with the mixing amounts. The matters described in relation to the dispersant composition for a hydraulic composition for centrifugal molding and the method for producing the same, and the hydraulic composition for centrifugal molding of the present invention can be appropriately applied to the method for producing a hydraulic composition for centrifugal molding of the present invention.

[0076] In the method for producing the hydraulic composition of the present invention, from the viewpoint of productivity, it is preferable to premix the component (A), the optional component (B), the optional component (C), and water, and then mix the mixture with the hydraulic powder. In the method for producing a hydraulic composition of the present invention, the addition of component (A), optional component (B), and optional component (C) is preferably carried out using the dispersant composition for hydraulic compositions for centrifugal molding of the present invention, and more preferably, the dispersant composition for hydraulic compositions for centrifugal molding of the present invention is mixed in advance with water, and the mixture is then mixed with hydraulic powder.

[0077] The mixing of component (A), optional component (B), optional component (C), hydraulic powder, aggregate, water, and optional components can be carried out using a mixer such as a mortar mixer or a forced twin-shaft mixer. The mixing is preferably carried out for 1 minute or more, more preferably 2 minutes or more, and preferably 5 minutes or less, more preferably 3 minutes or less. In preparing the hydraulic composition, the materials and agents and the amounts thereof described in the hydraulic composition can be used.

[0078] The obtained hydraulic composition is further filled into a formwork, centrifugal molded, and then cured and hardened. Examples of the formwork include formwork for buildings, formwork for concrete products, etc. Methods for filling the formwork include a method of directly pouring the hydraulic composition from a mixer, a method of pumping the hydraulic composition into the formwork, etc.

[0079] During curing of the hydraulic composition, heat curing may be performed to accelerate hardening. Here, heat curing can be performed by maintaining the hydraulic composition at a temperature of 40°C or higher and 90°C or lower to accelerate hardening.

[0080] [Method for producing a hardened product of a hydraulic composition] The present invention provides a method for producing a hardened product of a hydraulic composition, which comprises the following steps: Step 1: A step of mixing the component (A), hydraulic powder, aggregate, and water to obtain a hydraulic composition, and filling the obtained hydraulic composition into a formwork. Step 2: A step of clamping the hydraulic composition filled in the form obtained in step 1 by applying centrifugal force. Step 3: A step of allowing the clamped hydraulic composition obtained in step 2 to set in the formwork.

[0081] It is preferable to further mix component (B) in step 1. That is, step 1 is preferably a step of mixing component (A), component (B), hydraulic powder, aggregate, and water to obtain a hydraulic composition. It is preferable to further mix component (C) in step 1. That is, step 1 is preferably a step of mixing components (A), (B), (C), hydraulic powder, aggregate, and water to obtain a hydraulic composition.

[0082] Specific examples and preferred embodiments of the components (A), (B), and (C) used in the method for producing a hardened product of the hydraulic composition of the present invention are the same as those described for the dispersant composition for a hydraulic composition for centrifugal molding of the present invention. Specific examples and preferred embodiments of the hydraulic powder and aggregate used in the method for producing a hardened product of the hydraulic composition of the present invention are the same as those described for the hydraulic composition for centrifugal molding of the present invention. The hydraulic powder is used so that the W / P ratio falls within the range described for the hydraulic composition for centrifugal molding of the present invention. The amount of aggregate used is also the same as that described for the hydraulic composition for centrifugal molding of the present invention. In step 1 of the method for producing a hardened product of the hydraulic composition of the present invention, the contents of the components and their mass ratios described for the hydraulic composition for centrifugal molding of the present invention can be appropriately applied by replacing the contents of the components with the mixing amounts. The matters described in relation to the dispersant composition for hydraulic compositions for centrifugal molding and its manufacturing method, the hydraulic composition for centrifugal molding, and the manufacturing method of the hydraulic composition for centrifugal molding of the present invention can be appropriately applied to the manufacturing method of a hardened product of the hydraulic composition of the present invention.

[0083] The method for producing a cured body of the present invention preferably includes the following step 4 in addition to steps 1 to 3. Step 4: A step of steam curing the hydraulic composition set in step 3 in a formwork.

[0084] The method for producing a cured body of the present invention can include the following step 5 in addition to steps 1 to 4. Step 5: After step 4, the hydraulic composition is cooled and removed from the formwork.

[0085] The method for producing a cured body of the present invention can include the following step 6 in addition to steps 1 to 5. Step 6: A step of curing the hardened hydraulic composition obtained in Step 5 at room temperature and normal pressure.

[0086] In step 1, a method of adding a mixture containing water, component (A), optional component (B), and optional component (C) to a mixture containing aggregate and hydraulic powder and mixing them is preferred because it allows for easy and uniform mixing even when producing a hydraulic composition. Also, component (A), optional component (B), and optional component (C) are preferably added using the dispersant composition for hydraulic compositions for centrifugal molding of the present invention, and a method of adding a mixture containing the dispersant composition for hydraulic compositions for centrifugal molding of the present invention and water to a mixture containing aggregate and hydraulic powder and mixing them is preferred because it allows for easy and uniform mixing even when producing a hydraulic composition.

[0087] A specific method for step 1 includes mixing hydraulic powder and aggregate, adding a mixture containing water, component (A), optional component (B), and optional component (C) in the amounts described above, and kneading to prepare a hydraulic composition.

[0088] In step 1, component (A), optional component (B), and optional component (C) can be added separately to water, hydraulic powder, and aggregate and mixed.

[0089] In step 1, the method of filling the obtained hydraulic composition into the form may be a method in which the kneaded hydraulic composition is discharged from the kneading means and manually poured into the form and leveled.

[0090] In step 2, the hydraulic composition filled in the form is clamped by applying centrifugal force, and it is preferable to change the centrifugal force at least once. In step 2, the hydraulic composition can be clamped by applying centrifugal force that changes stepwise. That is, in step 2, the hydraulic composition is clamped at least once by changing the centrifugal force, and further, the hydraulic composition can be clamped by applying centrifugal force that changes stepwise and becomes even larger stepwise.

[0091] In step 2, the hydraulic composition filled in the formwork is preferably clamped under a centrifugal force of 0.5 G or more. The centrifugal force in centrifugal molding is preferably 0.5 G or more and preferably 30 G or less, more preferably 25 G or less. From the viewpoints of energy cost reduction and moldability, it is preferable to maintain the centrifugal force in the range of 15 G or more and 30 G or less, further 25 G or less (also called high centrifugal force) for 1 minute or more.

[0092] Compaction by centrifugal force is carried out, for example, at a centrifugal force of 0.5 G or more and 30 G or less, for preferably 5 minutes or more, more preferably 7 minutes or more, even more preferably 9 minutes or more, and preferably 40 minutes or less. From the viewpoint of compacting the green body smoothly, compaction by maintaining a high centrifugal force, for example, a centrifugal force of 20 G or more, is carried out for preferably 1 minute or more, more preferably 3 minutes or more, even more preferably 5 minutes or more, and preferably 15 minutes or less. That is, in step 3, the hydraulic composition can be clamped in the mold at a centrifugal force of 0.5 G or more and 30 G or less, for preferably 5 minutes or more, more preferably 7 minutes or more, even more preferably 9 minutes or more, and preferably 40 minutes or less. Also, in step 3, compaction by maintaining a centrifugal force of 20 G or more can be carried out for preferably 1 minute or more, more preferably 3 minutes or more, even more preferably 5 minutes or more, and preferably 15 minutes or less.

[0093] Compaction using centrifugal force can be performed in stages, and from the viewpoint of formability, a method in which the centrifugal force G is increased stepwise is preferred. Compaction can be performed under the following step conditions until the desired centrifugal force is achieved. For example, in the case of five stages, in step 3, it is preferable to clamp the hydraulic composition under the following conditions: (1) in the first stage, a centrifugal force of 0.5 G or more but less than 2 G is used at an initial speed for more than 0 minutes and not more than 15 minutes; (2) in the second stage, a centrifugal force of 2 G or more but less than 5 G is used at a second speed for more than 0 minutes and not more than 15 minutes; (3) in the third stage, a centrifugal force of 5 G or more but less than 10 G is used at a third speed for more than 0 minutes and not more than 15 minutes; (4) in the fourth stage, a centrifugal force of 10 G or more but less than 20 G is used at a fourth speed for more than 0 minutes and not more than 15 minutes; and (5) in the fifth stage, a centrifugal force of 20 G or more but less than 30 G is used at a fifth speed for more than 0 minutes and not more than 15 minutes.

[0094] In step 3, the hydraulic composition obtained in step 2 is solidified. Specifically, the composition is cured in air for 3 to 4 hours after mixing.

[0095] In step 4, the hardened hydraulic composition placed in the form obtained in step 3 is steam cured. In step 4, steam curing is preferably carried out at a temperature of 40°C or higher and 90°C or lower, and more preferably at a temperature of 60°C or higher and 90°C or lower. Furthermore, in step 4, steam curing is preferably carried out after pre-curing. For example, the ambient temperature of the formwork filled with the hydraulic composition (hereinafter sometimes referred to as ambient temperature) can be set to room temperature, preferably from 10°C to 40°C, and pre-curing can be carried out by leaving it for from 1 hour to 4 hours, and then steam curing can be carried out by setting the ambient temperature to from 40°C to 90°C, or further to from 60°C to 90°C. Pre-curing was carried out as a "preliminary" step in the examples and comparative examples described below. The pre-curing is preferably for 1 hour or more from the viewpoint of suppressing a decrease in strength due to cracking of the hardened body. Furthermore, when the method for producing a cured body of the present invention includes step 5, steps 4 and 5 can be carried out consecutively under a series of temperature controls. Steam curing is performed by applying steam to the periphery of a form filled with a hydraulic composition and maintaining the temperature at a predetermined level for a certain period of time. After the application of steam, the steam curing period may be (1) a temperature increase period until the temperature reaches the predetermined level, (2) a period during which the temperature is maintained at the predetermined level for a certain period of time, and (3) a period during which the temperature is decreased after the temperature is maintained at the predetermined level for a certain period of time.

[0096] Specific steam curing conditions in the method for producing a hardened body of the present invention are as follows: in step 4, the ambient temperature of the formwork is raised to 60°C or higher and 85°C or lower at a rate of 10°C or higher and 30°C or lower per hour, and the raised temperature is maintained for 2 hours or higher and 8 hours or lower; and then, in step 5, the ambient temperature is cooled to room temperature, for example, 20°C, at a rate of 5°C or higher and 20°C or lower per hour, and the molded body is demolded. The temperature rise rate is preferably 20° C. per hour or less in order to prevent a decrease in strength due to cracking of the cured body. An example of preferred conditions is a method in which a formwork filled with a hydraulic composition is left to stand for 3 hours (pre-curing) at an ambient temperature of room temperature, for example, 10°C to 30°C, then the ambient temperature is raised to 70°C to 90°C at a rate of 20°C per hour, the raised temperature of 70°C to 90°C is maintained for 2 hours to 6 hours, and then the ambient temperature is cooled to room temperature, for example, 20°C, at a rate of 10°C per hour (step 4), and the formed body is left to stand at that temperature for 20 hours to 30 hours, after which it is demolded (step 5). It is also possible to further cure the material in an autoclave at approximately 180°C.

[0097] In step 6, the set hydraulic composition obtained in step 5 is cured at room temperature and atmospheric pressure. Specifically, it is stored at 20°C and atmospheric pressure.

[0098] The manufacturing method of the present invention includes a method for manufacturing a hardened product of a hydraulic composition, which includes steps 1 to 5, and in which the time from the start of preparation of the hydraulic composition to demolding in step 5 is 8 hours or more and 30 hours or less. Here, the start of preparation of the hydraulic composition refers to the time when the hydraulic powder first comes into contact with water.

[0099] The hardened product of the hydraulic composition obtained by the method for producing a hardened product of the present invention can be used as a centrifugally molded concrete product, specifically, piles, poles, Hume pipes, etc. The hardened product of the hydraulic composition obtained by the method for producing a hardened product of the present invention has excellent formability for a hydraulic composition after a certain time (15 to 60 minutes) has passed since mixing, so that the product has little unevenness on the inner surface and edge surface, has excellent surface appearance, and furthermore, the smooth finish of the inner surface of the product reduces obstacles to cutting machines during pile driving and core excavation. [Example]

[0100] The components (A), (A') (a comparative component to (A)), (B) and (C) shown in Table 1 were as follows:

[0101] Component (A) (a-1): Monomer (A1) / Monomer (A2) / Monomer (A3) = acrylic acid / isoprenyl polyethylene glycol (55) ether / 2-hydroxyethyl acrylate = 50 mol% / 15 mol% / 35 mol%, weight average molecular weight = 50,000 (the number in parentheses is the average number of moles added) (a-2): Monomer (A1) / Monomer (A2) / Monomer (A3) = methacrylic acid / methoxypolyethylene glycol (45) methacrylate / 2-hydroxyethyl acrylate = 60 mol% / 20 mol% / 20 mol%, weight average molecular weight = 35,000 (the number in parentheses is the average number of moles added) Each of the polymers obtained was in the form of a sodium salt.

[0102] Component (A') (comparison component of component (A)) (a'-1): Monomer (A1) / Monomer (A2) / Monomer (A3) = Acrylic acid / Methallyl polyethylene glycol (55) ether / 2-hydroxyethyl acrylate = 41 mol% / 14 mol% / 45 mol%, Weight average molecular weight = 38,000 (The number in parentheses is the average number of moles added) (a'-2): Monomer (A1) / Monomer (A2) / Monomer (A3) = methacrylic acid / methoxypolyethylene glycol (100) methacrylate / 2-hydroxyethyl acrylate = 65 mol% / 15 mol% / 20 mol%, weight average molecular weight = 52,000 (average number of moles added in parentheses) (a'-3): Monomer (A1) / Monomer (A2) / Monomer (A3) = methacrylic acid / methoxypolyethylene glycol (15) methacrylate / 2-hydroxyethyl acrylate = 56 mol% / 29 mol% / 15 mol%, weight average molecular weight = 45,000 (average number of moles added in parentheses) (a'-4): Monomer (A1) / Monomer (A2) / Monomer (A3) = Acrylic acid / Isoprenyl polyethylene glycol (55) ether / 2-hydroxyethyl acrylate = 60 mol% / 25 mol% / 15 mol%, Weight average molecular weight = 40,000 (The number in parentheses is the average number of moles added) Each of the polymers obtained was in the form of a sodium salt.

[0103] (B) Component (b-1): Monomer (B1) / Monomer (B2) = Acrylic acid / Isoprenyl polyethylene glycol (55) ether = 80 mol% / 20 mol%, Weight average molecular weight = 50,000 (The number in parentheses is the average number of moles added) The polymer obtained is in the form of a sodium salt.

[0104] (C) Component (c-1): 90% fermented lactic acid (PURAC ULTRAPURE90, manufactured by PURAC Thailand Ltd.)

[0105] <Example 1 and Comparative Example 1> (1) Concrete mix Concrete mixes 1 and 2 are shown below. W / P is the ratio of water to hydraulic powder (mass%), and the amount of hydraulic powder is the total amount of cement (P1) and inorganic early strength additive (P2).

[0106] *Concrete mix 1 Cement (P1): 13.4 kg (Pacific Cement Corporation ordinary Portland cement, specific gravity 3.16) Inorganic early strengthening agent (P2): 0.4 kg (Elkem Microsilica 920, specific gravity 2.2) Tap water (W): 3.5 kg (contains components (A), (B), and (C)) W / P: 25% by mass Sand 1 (S1): 11.2 kg (Ibi River, Gifu Prefecture, specific gravity 2.55) Sand 2 (S2): 12.4 kg (Koka, Shiga Prefecture, specific gravity 2.58) Gravel (G): 31.6 kg (Ieshima, Hyogo Prefecture, specific gravity 2.63) All materials were adjusted to 30°C, and the amounts of components (A), (B), and (C) in the tap water were so small relative to the concrete mix that they were included in the amount of tap water used to calculate W / P.

[0107] *Concrete mix 2 Cement (P1): 12.9 kg (Pacific Cement Corporation ordinary Portland cement, specific gravity 3.16) Inorganic early strengthening agent (P2): 0.1 kg (Denki Kagaku Kogyo Co., Ltd., specific gravity 2.45) Tap water (W): 3.0 kg (contains components (A), (B), and (C)) W / P: 23% by mass Sand 1 (S1): 9.4 kg (Ibi River, Gifu Prefecture, specific gravity 2.55) Sand 2 (S2): 10.9 kg (Koka, Shiga Prefecture, specific gravity 2.58) Gravel (G): 25.6 kg (Ieshima, Hyogo Prefecture, specific gravity 2.63) All materials were adjusted to 30°C, and the amounts of components (A), (B), and (C) in the tap water were so small relative to the concrete mix that they were included in the amount of tap water used to calculate W / P.

[0108] (2) Concrete preparation A composition containing components (A), (B), and (C), and water, was prepared in the amounts shown in Table 1. The composition was added to tap water (W) from the concrete mix ingredients and stirred to prepare mixing water. The concrete was prepared by adding gravel, about half of the sand, a mixture of cement and an inorganic early-strengthening agent, and the remaining sand, in that order, to a forced twin-screw mixer (manufactured by KYC Corporation), dry mixing for 30 seconds, followed by the addition of the prepared mixing water, and mixing for 240 seconds to obtain concrete.

[0109] (3) Evaluation of moldability over time since mixing Concrete samples were placed in a centrifugal molding form (inner diameter 20 cm, outer diameter 25 cm, height 40 cm) 15, 30, 45, and 60 minutes after mixing (meaning the point at which the cement first comes into contact with water; the same applies below). The samples were then compacted centrifugally at an initial speed of 1 G for 2 minutes, 3 G for 2 minutes, 7 G for 2 minutes, 15 G for 3 minutes, and 25 G for 3 minutes. Centrifugal compactability was evaluated by visual inspection of the unhardened compacts at each time point. Those with sludge on the surface were labeled "sludge." The compacts were tilted to remove and collect the sludge, and their mass (g) was recorded. Concrete with poor fluidity and insufficient filling and compaction was labeled "junk." Those without defects such as "sludge" or "junk" were labeled "good moldability." Furthermore, for the compacts that were judged to have "good formability," a steel tape measure was inserted into the unhardened interior of the centrifugal specimen after centrifugal compaction, and the penetration depth (mm) was recorded and listed in order to quantitatively evaluate the formability (fluidity retention). The results are shown in Table 1. Furthermore, of the compacts obtained by centrifugal compaction, the compressive strength at 7 days (7-day strength) of the centrifugal compacts that had no molding defects was measured. Measurements were carried out in accordance with JIS A 1108. The results are shown in Table 1.

[0110] [Table 1]

[0111] In Table 1, the amounts of component (A), component (B), and component (C) added are the amounts (parts by mass) added relative to 100 parts by mass of hydraulic powder, and are the amounts of solid content (effective content) added.

[0112] In Table 1, the examples containing component (A) exhibited better formability for a longer period of time than the comparative examples that did not contain component (A) or contained component (A') instead of component (A). It can also be seen that, even when components (A) and (B) were used in combination in the examples, the greater the proportion of component (A), the better the formability for a longer period of time. This is thought to be because component (A) was adsorbed intermittently to the cement by the above-mentioned mechanism, effectively maintaining the fluidity of the concrete.

[0113] Furthermore, in Table 1, examples containing component (B) in addition to component (A) tend to require less additive amount to avoid molding defects compared to examples using component (A) alone. This is thought to be because component (B) has better fluidity immediately after mixing than component (A), so component (A) effectively maintains the fluidity of the concrete while reducing the total additive amount.

[0114] Furthermore, in Table 1, the examples containing component (C) in addition to components (A) and (B) tend to have superior compressive strength at 7 days (7-day strength) of centrifugally compacted bodies compared to the examples containing component (A) alone and component (A) and component (B). This is thought to be because component (C) activates the hydration reaction of hydraulic powders, such as cement, and densifies the structure of the hardened body.

Claims

1. A dispersant composition for a hydraulic composition for centrifugal molding, comprising the following component (A), the following component (B), the following component (C), and water: A dispersant composition for a hydraulic composition for centrifugal molding, wherein the total content of components (A), (B), and (C) is 2% by mass or more and 60% by mass or less. Component (A): A copolymer having a weight average molecular weight of 15,000 or more and 70,000 or less, which contains, as constituent monomers, a monomer (A1) represented by the following general formula (A1), a monomer (A2) represented by the following general formula (A2), and a monomer (A3) represented by the following general formula (A3), wherein, among the constituent monomers of the copolymer, the monomer (A1) accounts for 30 mol % or more and 70 mol % or less, the monomer (A2) accounts for 10 mol % or more and 50 mol % or less, and the monomer (A3) accounts for 20 mol % or more and 35 mol % or less. 【Chemistry 1】 [During the ceremony, R １１ａ , R １２ａ , R １３ａ may be the same or different, and may be a hydrogen atom, a methyl group, or (CH ２ ) ｒ COOM ２ａ and (CH ２ ) ｒ COOM ２ａ is COOM １ａ or other (CH ２ ) ｒ COOM ２ａ and an anhydride may be formed, in which case the M １ａ , M ２ａ does not exist. M １ａ , M ２ａ may be the same or different, and are a hydrogen atom, an alkali metal, an alkaline earth metal (1 / 2 atom), an ammonium group, an alkylammonium group, or a substituted alkylammonium group r: a number between 0 and 2 indicates.] 【Chemistry 2】 [During the ceremony, R ２１ａ , R ２２ａ : may be the same or different, and may be a hydrogen atom or a methyl group R ２３ａ : a hydrogen atom or -COO(AO) ｎ X １ａ X １ａ : an alkyl group having 1 to 4 carbon atoms or a hydrogen atom AO: a group selected from an ethyleneoxy group and a propyleneoxy group n: average number of moles of AO added, a number of 5 or more and 70 or less p: a number between 0 and 2 q: the number 0 or 1 indicates.] 【Transformation 3】 [During the ceremony, R ３１ａ : a hydrocarbon group having 1 to 4 carbon atoms which may contain a heteroatom indicates.] Component (B): A copolymer (B) containing, as constituent monomers, a monomer (B1) represented by the following general formula (B1) and a monomer (B2) represented by the following general formula (B2), and having a molecular weight of 10,000 or more and 70,000 or less, wherein, of the constituent monomers of the copolymer, the monomer (B1) accounts for 70 mol % or more and 99 mol % or less, and the monomer (B2) accounts for 1 mol % or more and 30 mol % or less. 【Chemistry 4】 [During the ceremony, R 11b , R 12b , R 13b : may be the same or different and each represent a hydrogen atom, a methyl group, or (CH 2 ) r' COOM 2b , and (CH 2 ) r' COOM 2b may form an anhydride with COOM 1b or another (CH 2 ) r' COOM 2b , in which case M 1b and M 2b of those groups do not exist. M 1b and M 2b may be the same or different and each represent a hydrogen atom, an alkali metal, an alkaline earth metal (1 / 2 atom), an ammonium group, an alkylammonium group, or a substituted alkylammonium group. r': a number between 0 and 2 indicates.] 【Transformation 5】 [During the ceremony, R 21b and R 22b may be the same or different and represent a hydrogen atom or a methyl group. R 23b : a hydrogen atom or —COO(AO) n′ X 1b X 1b : an alkyl group having 1 to 4 carbon atoms or a hydrogen atom AO: a group selected from an ethyleneoxy group and a propyleneoxy group n': average number of moles of AO added, a number of 5 or more and 100 or less p': a number between 0 and 2 q': a number of 0 or 1 indicates.] Component (C): Hydroxycarboxylic acid

2. 2. The dispersant composition for a hydraulic composition for centrifugal molding according to claim 1, wherein the content of component (A) is 1% by mass or more and 60% by mass or less.

3. The dispersant composition for a hydraulic composition for centrifugal molding according to claim 1 or 2, wherein in general formula (A3), R 31a is a hydrocarbon group containing a heteroatom having 1 to 4 carbon atoms.

4. 4. The dispersant composition for a hydraulic composition for centrifugal molding according to claim 1, wherein the total content of the components (A) and (B) is 2% by mass or more and 60% by mass or less.

5. A method for producing a dispersant composition for a hydraulic composition for centrifugal molding, comprising mixing the following component (A), the following component (B), the following component (C), and water: A method for producing a dispersant composition for a hydraulic composition for centrifugal molding, wherein the total mixed amount of components (A), (B), and (C) is 2% by mass or more and 60% by mass or less. Component (A): A copolymer having a weight average molecular weight of 15,000 or more and 70,000 or less, which contains, as constituent monomers, a monomer (A1) represented by the following general formula (A1), a monomer (A2) represented by the following general formula (A2), and a monomer (A3) represented by the following general formula (A3), wherein, among the constituent monomers of the copolymer, the monomer (A1) accounts for 30 mol % or more and 70 mol % or less, the monomer (A2) accounts for 10 mol % or more and 50 mol % or less, and the monomer (A3) accounts for 20 mol % or more and 35 mol % or less. 【Transformation 6】 [During the ceremony, R １１ａ , R １２ａ , R １３ａ may be the same or different, and may be a hydrogen atom, a methyl group, or (CH ２ ) ｒ COOM ２ａ and (CH ２ ) ｒ COOM ２ａ is COOM １ａ or other (CH ２ ) ｒ COOM ２ａ and an anhydride may be formed, in which case the M １ａ , M ２ａ does not exist. M １ａ , M ２ａ may be the same or different, and are a hydrogen atom, an alkali metal, an alkaline earth metal (1 / 2 atom), an ammonium group, an alkylammonium group, or a substituted alkylammonium group r: a number between 0 and 2 indicates.] 【Transformation 7】 [During the ceremony, R ２１ａ , R ２２ａ : may be the same or different, and may be a hydrogen atom or a methyl group R ２３ａ : a hydrogen atom or -COO(AO) ｎ X １ａ X １ａ : an alkyl group having 1 to 4 carbon atoms or a hydrogen atom AO: a group selected from an ethyleneoxy group and a propyleneoxy group n: average number of moles of AO added, a number of 5 or more and 70 or less p: a number between 0 and 2 q: the number 0 or 1 indicates.] 【Transformation 8】 [During the ceremony, R ３１ａ : a hydrocarbon group having 1 to 4 carbon atoms which may contain a heteroatom indicates.] Component (B): A copolymer (B) containing, as constituent monomers, a monomer (B1) represented by the following general formula (B1) and a monomer (B2) represented by the following general formula (B2), and having a molecular weight of 10,000 or more and 70,000 or less, wherein, of the constituent monomers of the copolymer, the monomer (B1) accounts for 70 mol % or more and 99 mol % or less, and the monomer (B2) accounts for 1 mol % or more and 30 mol % or less. 【Chemistry 9】 [During the ceremony, R 11b , R 12b , R 13b : may be the same or different and each represent a hydrogen atom, a methyl group, or (CH 2 ) r' COOM 2b , and (CH 2 ) r' COOM 2b may form an anhydride with COOM 1b or another (CH 2 ) r' COOM 2b , in which case M 1b and M 2b of those groups do not exist. M 1b and M 2b may be the same or different and each represent a hydrogen atom, an alkali metal, an alkaline earth metal (1 / 2 atom), an ammonium group, an alkylammonium group, or a substituted alkylammonium group. r': a number between 0 and 2 indicates.] 【Chemistry 10】 [During the ceremony, R 21b and R 22b may be the same or different and represent a hydrogen atom or a methyl group. R 23b : a hydrogen atom or —COO(AO) n′ X 1b X 1b : an alkyl group having 1 to 4 carbon atoms or a hydrogen atom AO: a group selected from an ethyleneoxy group and a propyleneoxy group n': average number of moles of AO added, a number of 5 or more and 100 or less p': a number between 0 and 2 q': a number of 0 or 1 indicates.] Component (C): Hydroxycarboxylic acid 6. The method for producing a dispersant composition for a hydraulic composition for centrifugal molding according to claim 5, wherein in general formula (A3), R 31a is a hydrocarbon group containing a heteroatom having 1 to 4 carbon atoms.

7. A hydraulic composition for centrifugal molding, comprising the following component (A), the following component (B), the following component (C), a hydraulic powder, an aggregate, and water: In the hydraulic composition for centrifugal molding, the total content of the components (A), (B), and (C) is 0.1 parts by mass or more and 10 parts by mass or less per 100 parts by mass of the hydraulic powder. Component (A): A copolymer having a weight average molecular weight of 15,000 or more and 70,000 or less, which contains, as constituent monomers, a monomer (A1) represented by the following general formula (A1), a monomer (A2) represented by the following general formula (A2), and a monomer (A3) represented by the following general formula (A3), wherein, among the constituent monomers of the copolymer, the monomer (A1) accounts for 30 mol % or more and 70 mol % or less, the monomer (A2) accounts for 10 mol % or more and 50 mol % or less, and the monomer (A3) accounts for 20 mol % or more and 35 mol % or less. 【Chemistry 11】 [During the ceremony, R １１ａ , R １２ａ , R １３ａ may be the same or different, and may be a hydrogen atom, a methyl group, or (CH ２ ) ｒ COOM ２ａ and (CH ２ ) ｒ COOM ２ａ is COOM １ａ or other (CH ２ ) ｒ COOM ２ａ and an anhydride may be formed, in which case the M １ａ , M ２ａ does not exist. M １ａ , M ２ａ may be the same or different, and are a hydrogen atom, an alkali metal, an alkaline earth metal (1 / 2 atom), an ammonium group, an alkylammonium group, or a substituted alkylammonium group r: a number between 0 and 2 indicates.] 【Chemistry 12】 [During the ceremony, R ２１ａ , R ２２ａ : may be the same or different, and may be a hydrogen atom or a methyl group R ２３ａ : a hydrogen atom or -COO(AO) ｎ X １ａ X １ａ : an alkyl group having 1 to 4 carbon atoms or a hydrogen atom AO: a group selected from an ethyleneoxy group and a propyleneoxy group n: average number of moles of AO added, a number of 5 or more and 70 or less p: a number between 0 and 2 q: the number 0 or 1 indicates.] 【Chemistry 13】 [During the ceremony, R ３１ａ : a hydrocarbon group having 1 to 4 carbon atoms which may contain a heteroatom indicates.] Component (B): A copolymer (B) containing, as constituent monomers, a monomer (B1) represented by the following general formula (B1) and a monomer (B2) represented by the following general formula (B2), and having a molecular weight of 10,000 or more and 70,000 or less, wherein, of the constituent monomers of the copolymer, the monomer (B1) accounts for 70 mol % or more and 99 mol % or less, and the monomer (B2) accounts for 1 mol % or more and 30 mol % or less. 【Chemistry 14】 [During the ceremony, R 11b , R 12b , R 13b : may be the same or different and each represent a hydrogen atom, a methyl group, or (CH 2 ) r' COOM 2b , and (CH 2 ) r' COOM 2b may form an anhydride with COOM 1b or another (CH 2 ) r' COOM 2b , in which case M 1b and M 2b of those groups do not exist. M 1b and M 2b may be the same or different and each represent a hydrogen atom, an alkali metal, an alkaline earth metal (1 / 2 atom), an ammonium group, an alkylammonium group, or a substituted alkylammonium group. r': a number between 0 and 2 indicates.] 【Chemistry 15】 [During the ceremony, R 21b and R 22b may be the same or different and represent a hydrogen atom or a methyl group. R 23b : a hydrogen atom or —COO(AO) n′ X 1b X 1b : an alkyl group having 1 to 4 carbon atoms or a hydrogen atom AO: a group selected from an ethyleneoxy group and a propyleneoxy group n': average number of moles of AO added, a number of 5 or more and 100 or less p': a number between 0 and 2 q': a number of 0 or 1 indicates.] Component (C): Hydroxycarboxylic acid

8. 8. The hydraulic composition for centrifugal molding according to claim 7, wherein the content of component (A) is 0.1 parts by mass or more and 10 parts by mass or less per 100 parts by mass of the hydraulic powder.

9. The hydraulic composition for centrifugal molding according to claim 7 or 8, wherein in general formula (A3), R 31a is a hydrocarbon group containing a heteroatom having 1 to 4 carbon atoms.

10. 10. The hydraulic composition for centrifugal molding according to claim 7, wherein the mass ratio (B) / (A) of the content of the component (A) to the content of the component (B) is 0.01 or more and 10 or less.

11. 11. The hydraulic composition for centrifugal molding according to claim 7, wherein the ratio of water to hydraulic powder is 10% by mass or more and 30% by mass or less.

12. 11. The hydraulic composition for centrifugal molding according to claim 7, wherein the ratio of water to hydraulic powder is 10% by mass or more and 25% by mass or less.

13. A method for producing a hardened hydraulic composition, comprising the following steps: Step 1: A step of mixing the following component (A), the following component (B), the following component (C), a hydraulic powder, an aggregate, and water to obtain a hydraulic composition, and filling the obtained hydraulic composition into a formwork, in which the total amount of the components (A), (B), and (C) is 0.1 parts by mass or more and 10 parts by mass or less per 100 parts by mass of the hydraulic powder. Step 2: A step of clamping the hydraulic composition filled in the form obtained in step 1 by applying centrifugal force. Step 3: A step of allowing the clamped hydraulic composition obtained in step 2 to set in the formwork. Component (A): A copolymer having a weight average molecular weight of 15,000 or more and 70,000 or less, which contains, as constituent monomers, a monomer (A1) represented by the following general formula (A1), a monomer (A2) represented by the following general formula (A2), and a monomer (A3) represented by the following general formula (A3), wherein, among the constituent monomers of the copolymer, the monomer (A1) accounts for 30 mol % or more and 70 mol % or less, the monomer (A2) accounts for 10 mol % or more and 50 mol % or less, and the monomer (A3) accounts for 20 mol % or more and 35 mol % or less. 【Chemistry 16】 [During the ceremony, R １１ａ , R １２ａ , R １３ａ may be the same or different, and may be a hydrogen atom, a methyl group, or (CH ２ ) ｒ COOM ２ａ and (CH ２ ) ｒ COOM ２ａ is COOM １ａ or other (CH ２ ) ｒ COOM ２ａ and an anhydride may be formed, in which case the M １ａ , M ２ａ does not exist. M １ａ , M ２ａ may be the same or different, and are a hydrogen atom, an alkali metal, an alkaline earth metal (1 / 2 atom), an ammonium group, an alkylammonium group, or a substituted alkylammonium group r: a number between 0 and 2 indicates.] 【Chemistry 17】 [During the ceremony, R ２１ａ , R ２２ａ : may be the same or different, and may be a hydrogen atom or a methyl group R ２３ａ : a hydrogen atom or -COO(AO) ｎ X １ａ X １ａ : an alkyl group having 1 to 4 carbon atoms or a hydrogen atom AO: a group selected from an ethyleneoxy group and a propyleneoxy group n: average number of moles of AO added, a number of 5 or more and 70 or less p: a number between 0 and 2 q: the number 0 or 1 indicates.] [Chemistry 18] [During the ceremony, R ３１ａ : a hydrocarbon group having 1 to 4 carbon atoms which may contain a heteroatom indicates.] Component (B): A copolymer (B) containing, as constituent monomers, a monomer (B1) represented by the following general formula (B1) and a monomer (B2) represented by the following general formula (B2), and having a molecular weight of 10,000 or more and 70,000 or less, wherein, of the constituent monomers of the copolymer, the monomer (B1) accounts for 70 mol % or more and 99 mol % or less, and the monomer (B2) accounts for 1 mol % or more and 30 mol % or less. 【Chemistry 19】 [During the ceremony, R 11b , R 12b , R 13b : may be the same or different and each represent a hydrogen atom, a methyl group, or (CH 2 ) r' COOM 2b , and (CH 2 ) r' COOM 2b may form an anhydride with COOM 1b or another (CH 2 ) r' COOM 2b , in which case M 1b and M 2b of those groups do not exist. M 1b and M 2b may be the same or different and each represent a hydrogen atom, an alkali metal, an alkaline earth metal (1 / 2 atom), an ammonium group, an alkylammonium group, or a substituted alkylammonium group. r': a number between 0 and 2 indicates.] 【Chemistry 20】 [During the ceremony, R 21b and R 22b may be the same or different and represent a hydrogen atom or a methyl group. R 23b : a hydrogen atom or —COO(AO) n′ X 1b X 1b : an alkyl group having 1 to 4 carbon atoms or a hydrogen atom AO: a group selected from an ethyleneoxy group and a propyleneoxy group n': average number of moles of AO added, a number of 5 or more and 100 or less p': a number between 0 and 2 q': a number of 0 or 1 indicates.] Component (C): Hydroxycarboxylic acid

14. 14. The method for producing a hardened hydraulic composition according to claim 13, wherein in step 1, 0.1 parts by mass or more and 10 parts by mass or less of component (A) is mixed with 100 parts by mass of the hydraulic powder.

15. The method for producing a hardened hydraulic composition according to claim 13 or 14, wherein in general formula (A3), R 31a is a hydrocarbon group containing a heteroatom having 1 to 4 carbon atoms.

16. The method for producing a hardened hydraulic composition according to any one of claims 13 to 15, wherein in step 1, 0.1 parts by mass or more and 10 parts by mass or less of the (A) component and the (B) component are mixed with 100 parts by mass of the hydraulic powder.

17. The method for producing a hardened hydraulic composition according to any one of claims 13 to 16, wherein in step 1, a hydraulic composition having a water / hydraulic powder ratio of 10% by mass or more and 30% by mass or less is prepared.

18. The method for producing a hardened hydraulic composition according to any one of claims 13 to 16, wherein in step 1, a hydraulic composition having a water / hydraulic powder ratio of 10% by mass or more and 25% by mass or less is prepared.

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