hydraulic components

Abstract

To provide a hydraulic composition including a polycarboxylic acid-based dispersant, wherein the hydraulic composition has a good fluidity which is difficult to be influenced by temperature in an extended period (between initially after kneading to 4 hours thereafter) and excellent high-early-strength property (after kneading to 24 hours).SOLUTION: A hydraulic composition includes the following (a) component, (b) component, (c) component, a hydraulic powder, water, and an aggregate, wherein the (a) component is a copolymer which is a copolymer including a monomer (1a) represented by a general formula (1a) and a monomer (2a) represented by a general formula (2a) as constituting monomers, with an average ratio of the monomer (2a) in all the constituent monomers being 60 mol% or over and 88 mol% or under; the (b) component is a thickener; and the (c) component is an oxycarboxylic acid or a salt thereof.SELECTED DRAWING: None

Description

[Technical Field]

[0001] This invention relates to a hydraulic composition. [Background technology]

[0002] There are fields where underwater non-segregation is required when pouring concrete. For example, Patent Document 1 discloses that in tunnel excavation, water may come into contact with the concrete due to groundwater, so it is desirable for the concrete used in tunnel construction methods such as the SENS method to have excellent water-resistant properties. Furthermore, since temperature conditions fluctuate depending on the environment during tunnel construction, it is desirable for the water-resistant properties to have little temperature dependence. To address these requirements, Patent Document 1 discloses a hydraulic composition containing two or more specific amine oxide compounds, hydraulic powder, water, aggregate, and a polycarboxylic acid-based dispersant, with a water / hydraulic powder ratio of 30% to 60%. Furthermore, Patent Document 2 discloses a hydraulic composition containing a cationic surfactant, an anionic aromatic compound, a hydraulic powder, a rapid setting agent, gluconic acid and / or a salt thereof, and water, with the objective of providing a hydraulic composition that is resistant to being washed away by flowing water, has reliable non-separation properties in water, can be applied underwater, and allows for adjustment of the fluidity disappearance time (gel time). [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2021-172530 [Patent Document 2] Japanese Patent Publication No. 2008-137852 [Overview of the Initiative] [Problems that the invention aims to solve]

[0004] At construction sites for hydraulic compositions, depending on the progress of concrete placement, long-term fluidity retention and the ability to remove formwork the following day are sometimes required from the perspective of construction time. Furthermore, the ambient temperature at construction sites changes daily. As a result, at the site, an easy-to-handle chemical agent is required that does not change in usage amount to achieve long-term fluidity retention and rapid strengthening of the hydraulic composition regardless of the ambient temperature. However, when a polycarboxylic acid-based dispersant is used as the chemical agent, the amount of polycarboxylic acid-based dispersant adsorbed onto the hydraulic powder contained in the hydraulic composition changes with changes in ambient temperature, thus changing the fluidity of the hydraulic composition. As a result, the amount of polycarboxylic acid-based dispersant used to control the fluidity must be changed each time, which leads to difficulties in handling at construction sites. Therefore, a polycarboxylic acid-based dispersant that is less affected by ambient temperature is desired. Therefore, the inventors considered that by investigating a polycarboxylic acid-based dispersant that exhibits little fluctuation in adsorption even when the ambient temperature changes, it would eliminate the need to change the amount used each time the ambient temperature changes, leading to easier handling at the construction site. Patent Document 1 discloses a hydraulic composition that exhibits excellent non-separation properties in water, and whose non-separation properties in water are less affected by temperature. However, it does not mention anything about the long-term flow retention or rapid strengthening properties of the hydraulic composition. Furthermore, Patent Document 2 does not mention anything about the effect of temperature on the hydraulic composition.

[0005] The present invention provides a hydraulic composition containing a polycarboxylic acid-based dispersant that exhibits good fluidity over a long period of time (from immediately after mixing to 4 hours) with little influence from temperature, and also has excellent rapid strengthening properties (24 hours from mixing). [Means for solving the problem]

[0006] The present invention relates to a hydraulic composition containing the following components (a), (b), and (c), hydraulic powder, water, and aggregate. (a) Components: A copolymer comprising monomer (1a) represented by the following general formula (1a) and monomer (2a) represented by the following general formula (2a) as constituent monomers, wherein the average proportion of monomer (2a) in the total constituent monomers is 60 mol% or more and 88 mol% or less. (b) Component: thickener (c) Component: oxycarboxylic acid or its salt

[0007] [Chemical formula]

[0008] [In the formula, R 2 , , 1 , r , 2 , 2 , 1 , R 2a : may be the same or different, and is a hydrogen atom or a methyl group R[[ID=​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​: They may be the same or different, and include hydrogen atoms, alkali metals, alkaline earth metals (1 / 2 atom), ammonium groups, alkylammonium groups, substituted alkylammonium groups, alkyl groups, hydroalkyl groups, or alkenyl groups. r: A number between 0 and 2 (inclusive) This indicates... [Effects of the Invention]

[0011] According to the present invention, a hydraulic composition containing a polycarboxylic acid-based dispersant is provided that exhibits good fluidity over a long period of time (from immediately after mixing to 4 hours) that is not easily affected by temperature (temperature versatility of fluidity), and also has excellent rapid strengthening properties (24 hours from mixing). [Modes for carrying out the invention]

[0012] The inventors have found that when component (a), component (b), and component (c), which are specific polycarboxylic acid-based dispersants, are included in a hydraulic composition, the fluidity over a long period of time (from immediately after mixing to 4 hours) is less affected by temperature and is good, and the rapid strengthening (24 hours after mixing) is excellent. The reason for these effects is not entirely clear, but it is speculated to be as follows. When components (a), (b), and (c) of the present invention are included in a hydraulic composition, components (a) and (c) are thought to compete for adsorption to the hydraulic powder. Since component (c) has a small molecular weight, it is thought to be adsorbed preferentially, while component (a) remains in the bulk phase. Component (b) thickens the hydraulic composition, and by reducing the adsorption rate of component (a) remaining in the bulk phase to the hydraulic powder, component (a) is thought to be adsorbed over time for a long period (from immediately after mixing to 4 hours), thus maintaining fluidity for a long period. Furthermore, since the amount of adsorption of component (a) does not fluctuate much with temperature, it is presumed that the fluidity over a long period is not affected by temperature. After a long period of retention, component (a) remaining in the bulk phase is gradually consumed, reducing fluidity and promoting the hydration reaction, which is thought to result in excellent rapid strengthening of the hardened hydraulic composition after, for example, 24 hours. In other words, we surmise that the problems of the present invention can be solved by combining components (a), (b), and (c) of the present invention.

[0013] [Hydraulic composition] <(a) Components> Component (a) of the present invention is a copolymer comprising monomer (1a) represented by the following general formula (1a) and monomer (2a) represented by the following general formula (2a) as constituent monomers, wherein the average proportion of monomer (2a) in the total constituent monomers is 60 mol% or more and 88 mol% or less. In the present invention, the average proportion of monomer (2a) in the total constituent monomers of component (a) is determined as follows: When one copolymer containing monomer (1a) and monomer (2a) as constituent monomers is used as component (a), the proportion (mol%) of monomer (2a) in the total constituent monomers of this copolymer is taken as the average proportion of monomer (2a); when two or more copolymers containing monomer (1a) and monomer (2a) as constituent monomers are used as component (a), the average value of the proportion of monomer (2a) in the total constituent monomers of the total copolymer is calculated from the proportion (mol%) of monomer (2a) in the total constituent monomers of each copolymer and the proportion (mass%) of each copolymer in component (a), and this is taken as the average proportion of monomer (2a).

[0014] [ka]

[0015] [During the ceremony, R 1a , R 2a : They may be the same or different, and may be a hydrogen atom or a methyl group R 3a : Hydrogen atom or -COO(AO) n1 X 1 R 4a : Hydrogen atom or alkyl group having 1 to 4 carbon atoms AO: A group selected from ethyleneoxy group and propyleneoxy group. n1: The average number of moles added to AO, a number between 20 and 130. q1: A number between 0 and 2 (inclusive) p1:0 or 1 This indicates...

[0016] [ka]

[0017] [During the ceremony, R 5a , R 6a , R 7a : They may be the same or different, and may be a hydrogen atom, a methyl group, or (CH2) r COOM 2 (CH2) r COOM 2 COOM 1 or other (CH2) r COOM 2 They may also form anhydrous compounds, in which case the M of those groups 1 M 2 It does not exist. M 1 M 2 : They may be the same or different, and include hydrogen atoms, alkali metals, alkaline earth metals (1 / 2 atom), ammonium groups, alkylammonium groups, substituted alkylammonium groups, alkyl groups, hydroalkyl groups, or alkenyl groups. r: A number between 0 and 2 (inclusive) This indicates...

[0018] In general formula (1a), R 1a From the viewpoint of temperature versatility of fluidity in hydraulic compositions, hydrogen atoms are preferred. In general formula (1a), R 2a From the viewpoint of temperature versatility of fluidity in hydraulic compositions, a methyl group is preferred. In general formula (1a), R 3a From the viewpoint of temperature versatility of fluidity in hydraulic compositions, hydrogen atoms are preferred. In general formula (1a), R 4a From the viewpoint of temperature versatility of fluidity in hydraulic compositions, hydrogen atoms or methyl groups are preferred, and methyl groups are more preferred. In general formula (1a), AO is preferably an ethyleneoxy group from the viewpoint of temperature versatility of fluidity in hydraulic compositions. AO preferably contains an ethyleneoxy group. In general formula (1a), n1 is the average number of moles of AO added, and from the viewpoint of rapid strengthening of the hydraulic composition, it is 20 or more, preferably 40 or more, more preferably 50 or more, even more preferably 60 or more, even more preferably 80 or more, even more preferably 100 or more, and 130 or less, preferably 125 or less, and even more preferably 120 or less. In general formula (1a), from the viewpoint of temperature versatility of fluidity in hydraulic compositions, q1 is preferably 0. In general formula (1a), from the viewpoint of temperature versatility of fluidity in hydraulic compositions, p1 is preferably 1.

[0019] Sulfonic acid may be used as an acid catalyst when producing monomer (1a). For example, such a method is described in Japanese Patent Publication No. 2008-214638. When producing component (a) of the present invention, a mixture containing monomer (1a) and sulfonic acid produced by such a method can be used as is, as long as the effects of the present invention are not impaired.

[0020] In general formula (2a), from the viewpoint of temperature versatility of fluidity in hydraulic compositions, R 5a A hydrogen atom is preferred. In general formula (2a), from the viewpoint of temperature versatility of fluidity in hydraulic compositions, R 6a A methyl group is preferred. In general formula (2a), from the viewpoint of temperature versatility of fluidity in hydraulic compositions, R 7a A hydrogen atom is preferred. (CH2) r COOM 2 Regarding COOM 1 or other (CH2) r COOM 2 They may also form anhydrous compounds, in which case the M of those groups 1 M 2 It does not exist. M 1 and M 2These may be the same or different, and are a hydrogen atom, alkali metal, alkaline earth metal (1 / 2 atom), ammonium group, alkylammonium group, substituted alkylammonium group, alkyl group, hydroalkyl group, or alkenyl group. M 1 M 2 The alkyl group, hydroalkyl group, and alkenyl group each preferably have 1 to 4 carbon atoms. M 1 and M 2 These may be the same or different, and are preferably a hydrogen atom, alkali metal, alkaline earth metal (1 / 2 atom), ammonium group, or alkylammonium group; more preferably a hydrogen atom, alkali metal, alkaline earth metal (1 / 2 atom), or ammonium group; even more preferably a hydrogen atom, alkali metal, or alkaline earth metal (1 / 2 atom); and even more preferably a hydrogen atom or alkali metal. From the viewpoint of temperature versatility of fluidity in hydraulic compositions, (CH2) in general formula (2a) r COOM 2 r is preferably 0.

[0021] (a) Of the total constituent monomers of component (a), the average proportion of monomer (2a) is 60 mol% or more, preferably 65 mol% or more, more preferably 70 mol% or more, even more preferably 75 mol% or more, and 88 mol% or less, preferably 85 mol% or less, and more preferably 83 mol% or less, from the viewpoint of the temperature versatility of the fluidity in the hydraulic composition.

[0022] (a) Of the total constituent monomers of component (a), the average proportion of monomer (1a) is preferably 12 mol% or more, more preferably 15 mol% or more, even more preferably 17 mol% or more, and preferably 40 mol% or less, more preferably 35 mol% or less, even more preferably 30 mol% or less, and even more preferably 25 mol% or less. In the present invention, the average proportion of monomer (1a) in the total constituent monomers of component (a) is determined as follows: When one copolymer containing monomer (1a) and monomer (2a) as constituent monomers is used as component (a), the proportion (mol%) of monomer (1a) in the total constituent monomers of this copolymer is taken as the average proportion of monomer (1a); when two or more copolymers containing monomer (1a) and monomer (2a) as constituent monomers are used as component (a), the average value of the proportion of monomer (1a) in the total constituent monomers of the total copolymer is calculated from the proportion (mol%) of monomer (1a) in the total constituent monomers of each copolymer and the proportion (mass%) of each copolymer in component (a), and this is taken as the average proportion of monomer (1a).

[0023] (a) Of the total constituent monomers of component (a), the average total proportion of monomer (1a) and monomer (2a) is preferably 80 mol% or more, more preferably 90 mol% or more, even more preferably 95 mol% or more, and preferably 100 mol% or less, from the viewpoint of the temperature versatility of the fluidity in the hydraulic composition. This average total amount may be 100 mol%. In the present invention, the average total ratio of monomer (1a) and monomer (2a) in the total constituent monomers of component (a) is defined as follows: When one copolymer containing monomer (1a) and monomer (2a) as constituent monomers is used as component (a), the total ratio (mol%) of monomer (1a) and monomer (2a) in the total constituent monomers of this copolymer is defined as the average total ratio of monomer (1a) and monomer (2a), and as component (a), monomer When two or more copolymers containing (1a) and monomer (2a) as constituent monomers are used, the average value of the total proportion of monomer (1a) and monomer (2a) in the total constituent monomers in the entire copolymer is calculated from the total proportion (mol%) of monomer (1a) and monomer (2a) in the total constituent monomers in each copolymer and the proportion (mass%) of each copolymer in component (a), and this is taken as the average total proportion of monomer (1a) and monomer (2a).

[0024] (a) The weight-average molecular weight of component (a) is preferably 15,000 or more, more preferably 25,000 or more, even more preferably 350,000 or more, and preferably 100,000 or less, more preferably 80,000 or less, and even more preferably 60,000 or less, from the viewpoint of temperature versatility of fluidity in the hydraulic composition. If component (a) contains two or more copolymers containing monomer (1a) and monomer (2a) as constituent monomers, it is preferable that the weight-average molecular weight of at least one copolymer is within the above range.

[0025] (a) The weight-average molecular weight of the component was measured by gel permeation chromatography (GPC) under the following conditions. *GPC conditions Equipment: GPC (HLC-8320GPC), manufactured by Tosoh Corporation. Columns: G4000PWXL + G2500PWXL (manufactured by 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 substances: Polyethylene glycol equivalent (monodisperse polyethylene glycols with known molecular weights: 87,500, 250,000, 145,000, 46,000, 24,000)

[0026] (a) Component (a) preferably contains two or more copolymers containing monomer (1a) and monomer (2a) as constituent monomers, from the viewpoint of temperature versatility of fluidity in hydraulic compositions, and more preferably contains (a1) a copolymer (hereinafter referred to as (a1) component) containing monomer (1a) and monomer (2a) as constituent monomers, with monomer (2a) being 70 mol% or more and 85 mol% or less of the total constituent monomers, and (a2) a copolymer (hereinafter referred to as (a2) component) containing monomer (1a) and monomer (2a) as constituent monomers, with monomer (2a) being less than 70 mol% or more than 85 mol% of the total constituent monomers.

[0027] <(b) Component> Component (b) of the present invention is a thickening agent. (b) is preferably a combination of (b1) an amine oxide type surfactant (hereinafter referred to as (b11) component) and an anionic aromatic compound (hereinafter referred to as (b12) component) (hereinafter referred to as (b1) component), or (b2) a cellulose-based thickener (hereinafter referred to as (b2) component), from the viewpoint of non-separation in water in the hydraulic composition and control of the adsorption rate of (a) component to the hydraulic powder.

[0028] As the amine oxide type surfactant of component (b11), a compound represented by the following general formula (b11) is preferred.

[0029] [ka]

[0030] [In the formula, X is R 11b or R 12b -[CONH-CH2CH2CH2] n - is the group represented by R 11b R is an alkyl group having 14 to 22 carbon atoms or an alkenyl group having 14 to 22 carbon atoms. 12b R 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. 2 and R 3 Each of these is independently an alkyl group having 1 to 4 carbon atoms or -(C2H4O) p It is a group represented by H. p is the average number of moles added, and R 2 and R 3 The sum of these numbers is between 0 and 5 (exclusive).

[0031] In general formula (b11), X is R 11b or R 12b -[CONH-CH2CH2CH2] n It is a base represented by -. R 11b This is an alkyl group having 14 to 22 carbon atoms or an alkenyl group having 14 to 22 carbon atoms. R 11b When the group is an alkenyl group, the number of carbon atoms is preferably 18 or more, and preferably 22 or less. R 11b When it is an alkyl group, the number of carbon atoms is preferably 16 or more, and preferably 22 or less. R 12b This is an alkyl group having 13 to 21 carbon atoms or an alkenyl group having 13 to 21 carbon atoms. R 12b When the group is an alkenyl group, the number of carbon atoms is preferably 17 or more, and preferably 21 or less. R 12b When it is an alkyl group, the number of carbon atoms is preferably 15 or more, and preferably 21 or less. n is preferably 0 or 1. R 2 and R 3 Each is 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.

[0032] The hydraulic composition of the present invention preferably contains two or more compounds represented by the general formula (b11) (hereinafter also referred to as compound (b11)) as component (b11), from the viewpoint of non-separation in water in the hydraulic composition and control of the adsorption rate of component (a) to the hydraulic powder. Furthermore, the two or more compounds have different X values ​​in the general formula (b11), and at least one of the two or more compounds has a different R value for X in the general formula (b11). 11b or R 12b It is a compound with an alkenyl group.

[0033] Regarding compound (b11), if X in the general formula (b11) is different, consider the case where there are two types of compound (b11) as an example, and the following embodiments can be cited. In the following embodiments, of the two types of compound (b11), at least one of compound (b11) has R 11b or R 12b This is an alkenyl group. (i) One of the Rs 11b or R 12b is an alkyl group, and the other R 11b or R 12b is an alkenyl group. (ii) The number of carbon atoms of one of the Rs 11b or R 12b differs from the number of carbon atoms of the other R 11b or R 12b . (iii) One X is R 11b and the other X is R 12b -[CONH-CH2CH2CH2] n -. (iv) Both Xs are R 12b -[CONH-CH2CH2CH2] n - and one n differs from the other n. (v) Combinations of (i) to (iv) above.

[0034] The hydraulic composition of the present invention contains, as the component (b1), two or more, preferably five or less, more preferably two compounds (b11) in which X in the general formula (b11) is different. And, among the two or more compounds (b11) contained in the hydraulic composition, at least one is a compound in which R 11b or R 12b in X in the general formula (b11) is an alkenyl group having 14 to 22 carbon atoms, that is, a compound containing an alkenyl group having 14 to 22 carbon atoms as R 11b [[ID= forty-four ]]in X in the general formula (b11) or a compound containing an alkenyl group having 13 to 21 carbon atoms as R 12b . <C

[0035] In the present invention, there are two compounds (b11). Among the two compounds (b11), including (i) to (v) above, one is preferably a compound in which X in the general formula (b11) is R 11b and has an alkenyl group having 14 to 22 carbon atoms. That is, the hydraulic composition of the present invention contains, as the component (b1), two compounds represented by the general formula (b11), the two compounds have different Xs in the general formula (b11), and among the two compounds, one is such that X in the general formula (b11) is R 11bAnd R 11b One embodiment is in which the compound is an alkenyl group.

[0036] The hydraulic composition of the present invention has as component (b1) X in general formula (b11) R 11b or R 12b -[CONH-CH2CH2CH2] n - represents a group (where R 11b R is an alkenyl group having 14 to 22 carbon atoms. 12b One embodiment includes a compound (b11-1) in which ( is an alkenyl group having 13 to 21 carbon atoms) and a compound (b11-2) in which X in general formula (b11) is different from compound (b11-1). Specifically, examples of hydraulic compositions include those containing, as component (b1), a compound represented by the following general formula (b11-1) (b11-1) and a compound represented by the following general formula (b11-2) (b11-2).

[0037] [ka]

[0038] [During the ceremony, n1 and n2 are independent integers between 0 and 3 (inclusive). R 13b When n1 is 0, it is an alkenyl group with 14 to 22 carbon atoms, and when n1 is 1 to 3, it is an alkenyl group with 13 to 21 carbon atoms. R 14b 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; 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 is R 11a It is a different alkenyl group. R 2 and R 3 Each of these is independently an alkyl group having 1 to 4 carbon atoms or -(C2H4O)p It is a group represented by H. p is the average number of moles added, and R 2 and R 3 The sum of these numbers is between 0 and 5 (exclusive).

[0039] In general formula (b11-1), R 13b The number of carbon atoms is preferably 17 or more, and preferably 22 or less. In the general formula (b11-1), n1 is preferably 0 or 1, more preferably 0.

[0040] In the general formula (b11-2), when n2 is 0, R 14b If R is an alkyl group, 14b The number of carbon atoms is preferably 16 or more, and preferably 22 or less. In the general formula (b11-2), when n2 is 0, R 14b If R is an alkenyl group, 14b The number of carbon atoms is preferably 18 or more, and preferably 22 or less. In the general formula (b11-2), n2 is 1 to 3 and R 14b If R is an alkyl group, 14b The number of carbon atoms is preferably 15 or more, and preferably 21 or less. In the general formula (b11-2), n2 is 1 to 3 and R 14b If R is an alkenyl group, 14b The number of carbon atoms is preferably 17 or more, and preferably 21 or less. In general formula (b11-2), R 14b Alkyl alkyl groups are preferred. In the general formula (b11-2), n2 is preferably 0 or 1.

[0041] In general formula (b11-1) or (b11-2), R 2 and R 3 Each is independently preferably a C1 or C2 alkyl group or -(C2H4O) p The group is represented by H, and more preferably by an alkyl group having 1 or 2 carbon atoms. In the general formula (b11-1) or (b11-2), p is preferably a number between 0 and 3. If n1 and n2 are the same number, R 14b The alkenyl group is R 13b It is a different alkenyl group.

[0042] The hydraulic composition of the present invention may include an embodiment in which, as component (b1), a compound (b11-3) represented by the following general formula (b11-3) and a compound (b11-2) represented by the following general formula (b11-2).

[0043] [ka]

[0044] [During the ceremony, n2 is an integer between 0 and 3 (inclusive). R 13b This is an alkenyl group having 14 to 22 carbon atoms. R 14b 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; 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 14b The alkenyl group is R 13b It is a different alkenyl group. R 2 and R 3 Each of these is independently an alkyl group having 1 to 4 carbon atoms or -(C2H4O) p It is a group represented by H. p is the average number of moles added, and R 2 and R 3 The sum of these numbers is between 0 and 5 (exclusive).

[0045] Compound (b11-3) represented by general formula (b11-3) corresponds to the compound in general formula (b11-1) where n1 is 0. 13b , R 2 and R 3The preferred embodiment is the same as that of general formula (b11-1). In this combination as well, the preferred embodiment of compound (b11-2) is the same as described above.

[0046] Component (b12) is an anionic aromatic compound. Examples of anionic aromatic compounds 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, or salts thereof, with sulfonic acids having an aromatic ring, carboxylic acids having an aromatic ring, and one or more compounds selected from salts thereof being preferred. The anionic aromatic compound is preferably an acidic compound with a total carbon number of 6 to 12. Specifically, examples of anionic aromatic compounds include salicylic acid, p-toluenesulfonic acid, sulfosalicylic acid, benzoic acid, m-sulfobenzoic acid, p-sulfobenzoic acid, 4-sulfophthalic acid, 5-sulfisophthalic acid, p-phenolsulfonic acid, m-xylene-4-sulfonic acid, cumenesulfonic acid, methylsalicylic acid, styrenesulfonic acid, chlorobenzoic acid, and one or more selected from these salts. From the viewpoint of non-separation in water in the hydraulic composition and control of the adsorption rate of component (a) to the hydraulic powder, one or more selected from m-xylene-4-sulfonic acid, cumenesulfonic acid, methylsalicylic acid, styrenesulfonic acid, and one or more selected from these salts are preferred, one or more selected from m-xylene-4-sulfonic acid, cumenesulfonic acid, and one or more selected from these salts are more preferred, and m-xylene-4-sulfonic acid or a salt thereof is even more preferred.

[0047] (b2) The component is a cellulose-based thickener. Examples of cellulose-based thickeners include hydroxypropyl methylcellulose, hydroxyethylcellulose, and methylcellulose. A cellulose-based thickener selected from hydroxypropyl methylcellulose and methylcellulose is preferred. Cellulose-based thickeners include cellulose fiber Materials such as cellulose nanofibers and cellulose nanocrystals can also be used.

[0048] The cellulose-based thickener is preferably one having a structure in which the hydroxyl groups of the glucose ring of cellulose are replaced with methoxy groups. In that case, from the viewpoint of non-separation in water in the hydraulic composition and control of the adsorption rate of component (a) to the hydraulic powder, the degree of substitution of the cellulose-based thickener, defined by the average number of hydroxyl groups replaced with methoxy groups per glucose ring unit of cellulose, is preferably 5 or less, more preferably 4 or less, even more preferably 3 or less, even more preferably 2 or less, preferably 0.01 or more, more preferably 0.1 or more, even more preferably 0.5 or more, and even more preferably 1.0 or more.

[0049] Furthermore, the cellulose-based thickener is preferably one having a structure in which the hydroxyl group of the glucose ring of cellulose is substituted with a hydroxypropoxy group or a hydroxyethoxy group, such as hydroxypropyl methylcellulose or hydroxyethylcellulose. In that case, from the viewpoint of non-separation in water in the hydraulic composition and control of the adsorption rate of component (a) to the hydraulic powder, the number of substituted moles, defined by the average number of moles of hydroxypropoxy groups and / or hydroxyethoxy groups added per glucose ring unit of cellulose, is preferably 5 or less, more preferably 4 or less, even more preferably 3 or less, even more preferably 2 or less, preferably 0.01 or more, more preferably 0.05 or more, even more preferably 0.1 or more, and even more preferably 0.15 or more.

[0050] Cellulose-based thickeners are more preferably those having a structure in which the hydroxyl group of the glucose ring of cellulose is substituted with a methoxy group in the aforementioned range of substitution moles and a hydroxypropoxy group and / or hydroxyethoxy group in the aforementioned range of substitution moles.

[0051] <(c) component> Component (c) of the present invention is an oxycarboxylic acid or a salt thereof. Oxycarboxylic acids are so-called hydroxycarboxylic acids that have a hydroxyl group and a carboxyl group in their molecule. The number of carbon atoms in an oxycarboxylic acid is preferably 2 or more, more preferably 3 or more, preferably 18 or less, more preferably 12 or less, even more preferably 10 or less, and even more preferably 8 or less. The number of hydroxyl groups in an oxycarboxylic acid is preferably 1 or more, more preferably 2 or more, even more preferably 4 or more, preferably 18 or less, more preferably 12 or less, even more preferably 10 or less, and even more preferably 8 or less. The number of carboxyl groups in an oxycarboxylic acid is preferably 1 or more, preferably preferably 12 or less, more preferably 6 or less, and even more preferably 3 or less.

[0052] Examples of oxycarboxylic acids include one or more selected from gluconic acid, citric acid, glucoheptonic acid, arabonic acid, malic acid, tartaric acid, and salts thereof. Examples of oxycarboxylic acid salts include alkali metal salts such as sodium salts and alkaline earth metal salts such as magnesium salts. (c) Component is preferably one or more selected from gluconic acid, tartaric acid, citric acid, and their salts, from the viewpoint of suppressing adsorption of component (a) to the hydraulic powder in the hydraulic composition and maintaining flow for a long period of time, and more preferably one or more selected from gluconic acid and its salts.

[0053] <Hydraulic powder> The hydraulic powder used in the hydraulic composition of the present invention is a powder that hardens when mixed with water, and examples of cement include ordinary Portland cement, rapid-hardening Portland cement, ultra-rapid-hardening Portland cement, sulfate-resistant Portland cement, low-heat Portland cement, white Portland cement, and eco-cement (e.g., JIS R5214). The cement is preferably selected from rapid-hardening Portland cement, ordinary Portland cement, sulfate-resistant Portland cement, and white Portland cement, more preferably selected from rapid-hardening Portland cement and ordinary Portland cement, and even more preferably rapid-hardening Portland cement. The hydraulic composition of the present invention preferably contains a cement selected from rapid-hardening Portland cement and ordinary Portland cement as the hydraulic powder, and more preferably contains rapid-hardening Portland cement.

[0054] Furthermore, the hydraulic powder may contain blast furnace slag, fly ash, silica fume, anhydrous gypsum, etc., and may also contain non-hydraulic limestone fine powder, etc. As the hydraulic powder, blast furnace cement, fly ash cement, silica fume cement, etc., which are mixtures of cement and blast furnace slag, fly ash, silica fume, etc., may be used. It may also contain clay such as bentonite.

[0055] <Aggregates> Examples of aggregates include fine aggregate and coarse aggregate. Depending on the application, lightweight aggregate may also be used. The terminology for aggregates is based on "Concrete General Survey" (published June 10, 1998, by Gijutsu Shoin). Examples of fine aggregates include river sand, land sand, mountain sand, sea sand, lime sand, silica sand and their crushed forms, blast furnace slag fine aggregate, ferronickel slag fine aggregate, lightweight fine aggregate (artificial and natural), and recycled fine aggregate. Examples of coarse aggregate include those specified in number 2312 of JIS A0203-2014. Examples of coarse aggregate include river gravel, land gravel, mountain gravel, sea gravel, lime gravel, crushed stone thereof, blast furnace slag coarse aggregate, ferronickel slag coarse aggregate, lightweight coarse aggregate (artificial and natural), and recycled coarse aggregate. From the viewpoint of homogeneity of hydraulic compositions such as concrete, the maximum size of the coarse aggregate is preferably 1.2 mm or more, more preferably 5 mm or more, and from the viewpoint of pumpability, it is preferably 20 mm or less, more preferably 15 mm or less. This maximum size of coarse aggregate is the maximum size of the coarse aggregate particle size obtained by the sieve test described in JIS A5005. These fine aggregates and coarse aggregates may be used in mixtures of different types, or they may be used in combination as a single type.

[0056] <Composition, etc.> The hydraulic composition of the present invention contains component (a) in an amount of preferably 0.6% by mass or more, more preferably 0.7% by mass or more, even more preferably 0.8% by mass or more, and preferably 5.0% by mass or less, more preferably 3.0% by mass or less, and even more preferably 2.0% by mass or less, relative to the hydraulic powder, from the viewpoint of initial fluidity and long-term fluid retention.

[0057] In the hydraulic composition of the present invention, when component (a) includes component (a1) and component (a2), the mass ratio (a1) / (a2) of the content of component (a1) to the content of component (a2) is preferably 40 / 60 or more, more preferably 50 / 50 or more, even more preferably 60 / 40 or more, even more preferably 70 / 30 or more, and preferably 95 / 5 or less, more preferably 90 / 10 or less, and even more preferably 85 / 15 or less, from the viewpoint of fluidity and temperature versatility.

[0058] The hydraulic composition of the present invention contains component (b) in an amount of water, preferably 0.3% by mass or more, more preferably 0.4% by mass or more, even more preferably 0.5% by mass or more, preferably 4.0% by mass or less, more preferably 3.0% by mass or less, even more preferably 2.5% by mass or less, and even more preferably 2.0% by mass or less, from the viewpoint of non-separation in water and control of the adsorption rate of component (a) to the hydraulic powder.

[0059] The hydraulic composition of the present invention, when containing component (b1) as component (b), contains component (b1) in an amount of water, preferably 0.50% by mass or more, more preferably 0.75% by mass or more, even more preferably 1.00% by mass or more, preferably 4.00% by mass or less, more preferably 3.0% by mass or less, even more preferably 2.5% by mass or less, and even more preferably 2.0% by mass or less, from the viewpoint of non-separation in water and control of the adsorption rate of component (a) to the hydraulic powder. In the present invention, if component (b1) includes component (b12), the mass of component (b12) shall be the value obtained by converting component (b12) to its sodium salt equivalent.

[0060] In the hydraulic composition of the present invention, when component (b1) contains compound (b11-1), compound (b11-2), and component (b12), from the viewpoint of non-separation in water and control of the adsorption rate of component (a) to the hydraulic powder, the content of compound (b11-1) in component (b1) is preferably 10% by mass or more, more preferably 14% by mass or more, preferably 25% by mass or less, more preferably 20% by mass or less, the content of compound (b11-2) is preferably 70% by mass or more, more preferably 75% by mass or more, preferably 85% by mass or less, more preferably 80% by mass or less, and the content of component (b12) is preferably 5% by mass or more, more preferably 7.5% by mass or more, preferably 20% by mass or less, more preferably 15% by mass or less.

[0061] In the thickening agent composition for hydraulic compositions of the present invention, when component (b1) contains compound (b11-3), compound (b11-2), and component (b12), from the viewpoint of non-separation in water and control of the adsorption rate of component (a) to hydraulic powder, the content of compound (b11-3) in component (b) is preferably 10% by mass or more, more preferably 14% by mass or more, preferably 25% by mass or less, more preferably 20% by mass or less, the content of compound (b11-2) is preferably 70% by mass or more, more preferably 75% by mass or more, preferably 85% by mass or less, more preferably 80% by mass or less, and the content of component (b12) is preferably 5% by mass or more, more preferably 7.5% by mass or more, preferably 20% by mass or less, more preferably 15% by mass or less.

[0062] The hydraulic composition of the present invention, when containing component (b2) as component (b), contains component (b2) in an amount of water that is preferably 0.30% by mass or more, more preferably 0.40% by mass or more, even more preferably 0.50% by mass or more, preferably 2.0% by mass or less, more preferably 11.5% by mass or less, and even more preferably 1.00% by mass or less, from the viewpoint of non-separation in water and control of the adsorption rate of component (a) to the hydraulic powder.

[0063] The hydraulic composition of the present invention contains component (c) in an amount of preferably 0.02% by mass or more, more preferably 0.04% by mass or more, and even more preferably 0.06% by mass or more, relative to the hydraulic powder, from the viewpoint of suppressing fluctuations due to temperature changes, and preferably 0.18% by mass or less, more preferably 0.15% by mass or less, and even more preferably 0.13% by mass or less, from the viewpoint of strength development after 24 hours. In this invention, the mass of component (c) shall be the value obtained by converting component (c) to its sodium salt equivalent.

[0064] In the hydraulic composition of the present invention, the mass ratio (a) / (c) of the content of component (a) to the content of component (c) is preferably 4.5 or more, more preferably 5.5 or more, even more preferably 6.0 or more, and preferably 40 or less, more preferably 38 or less, even more preferably 36 or less, even more preferably 30 or less, even more preferably 25 or less, and even more preferably 20 or less, from the viewpoint of suppressing the spreading of the hydraulic composition and fluctuations due to temperature changes.

[0065] The hydraulic composition of the present invention contains water. The water / hydraulic powder ratio (W / C) of the hydraulic composition of the present invention is preferably 30% by mass or more, more preferably 33% by mass or more, even more preferably 36% by mass or more, and preferably 45% by mass or less, more preferably 43% by mass or less, and even more preferably 41% by mass or less, from the viewpoint of strength development. Here, the water / hydraulic powder ratio (W / C) is the mass percentage (mass%) of water and hydraulic powder in the hydraulic composition, and is calculated as water / hydraulic powder × 100. Furthermore, if the hydraulic powder includes powders selected from those having properties that harden through hydration reactions such as cement, powders having pozzolanic properties, powders having latent hydraulic properties, and stone powder (calcium carbonate powder), then in this invention, the amounts of these powders are also included in the amount of hydraulic powder. In addition, if the powder having properties that harden through hydration reactions contains a high-strength admixture, then the amount of the high-strength admixture is also included in the amount of hydraulic powder. This also applies to other parts of mass related to the mass of the hydraulic powder.

[0066] The hydraulic composition of the present invention preferably contains aggregate of 1000 kg / m³. 3 The above is a comfortable 1350 kg / m 3 More preferably 1500 kg / m 3 In addition, preferably 2300 kg / m 3 More preferably, 2150 kg / m 3 More preferably, 1900 kg / m 3 The following applies: The hydraulic composition of the present invention preferably contains 400 kg / m³ of fine aggregate. 3Above, a comfortable 500 kg / m 3 More preferably 600 kg / m 3 In addition, preferably 1100 kg / m 3 Below, a comfortable 1000 kg / m 3 More preferably, 900 kg / m 3 The following applies: The hydraulic composition of the present invention preferably contains 500 kg / m³ of coarse aggregate. 3 The above is a comfortable 750 kg / m 3 More preferably 800 kg / m 3 In addition, preferably 1200 kg / m 3 More preferably, 1150 kg / m 3 More preferably, 1000 kg / m 3 The following applies:

[0067] The hydraulic composition of the present invention preferably has a fine aggregate ratio of 30% by volume or more, more preferably 34% by volume or more, and preferably 50% by volume or less, and more preferably 46% by volume or less. The s / a ratio is calculated based on the volumes of fine aggregate (S) and coarse aggregate (G) using the formula s / a = [S / (S+G)] × 100 (volume %).

[0068] The hydraulic composition may contain components other than components (a), (b), and (c), such as AE agents, foaming agents, foaming agents, waterproofing agents, fluidizing agents, defoaming agents, etc., to the extent that it does not affect the effects of the present invention.

[0069] The hydraulic composition of the present invention can be used for a variety of applications. For example, it can be used for high-flow concrete, underwater non-segregating concrete, lightweight high-flow concrete, permeable concrete, cast-in-place lining (ECL) method, or SENS method. Among these, it is particularly preferred for use in the SENS method.

[0070] The hydraulic composition of the present invention has a slump flow of 15 seconds or more, more preferably 17 seconds or more, and more preferably 45 seconds or less, and more preferably 40 seconds or less, from the viewpoint of ease of handling, as measured by the method described in JIS A1150 (2007), until the time to reach 50 cm.

[0071] <Method for producing a hydraulic composition> The hydraulic composition of the present invention can be produced by mixing component (a), component (b), component (c), hydraulic powder, and water. That is, the present invention provides a method for producing a hydraulic composition containing component (a), component (b), component (c), hydraulic powder, and water. The matters described in the hydraulic composition of the present invention can be appropriately applied to the method for producing the hydraulic composition of the present invention. For example, specific examples and preferred embodiments of each component are the same as those of the hydraulic composition of the present invention. Furthermore, the content and mass ratio of each component in the hydraulic composition of the present invention can be applied to the method for producing the hydraulic composition of the present invention by replacing the content of each component with the amount of mixture.

[0072] In the method for producing a hydraulic composition of the present invention, it is preferable to produce a hydraulic composition in which the time it takes for the slump flow, measured by the method described in JIS A1150 (2007), to reach 50 cm is preferably 15 seconds or more, more preferably 17 seconds or more, and preferably 45 seconds or less, and more preferably 40 seconds or less, from the viewpoint of ease of handling. [Examples]

[0073] The components used in the examples and comparative examples are shown below. (a) The copolymers used as components are as follows: • Copolymer 1: MEPEG(120) ester / MAA = 20 / 80 (mol%) copolymer, sodium salt, weight-average molecular weight 50,000 • Copolymer 2: MEPEG(120) ester / MAA = 35 / 65 (mol%) copolymer, sodium salt, weight-average molecular weight 60,000 • Copolymer 3: MEPEG(23) ester / MAA = 27 / 73 (mol%) copolymer, sodium salt, weight-average molecular weight 40,000 • Copolymer 4: MEPEG(120) ester / MAA = 10 / 90 (mol%) copolymer, sodium salt, weight-average molecular weight 40,000 • Copolymer 5: MEPEG(120) ester / MAA = 45 / 55 (mol%) copolymer, sodium salt, weight-average molecular weight 50,000 The monomers of each of the above copolymers are as follows: MEPEG(120) ester: Methoxypolyethylene glycol(120) monomethacrylate (the number in parentheses is the average number of moles of ethylene oxide added; the same applies below), monomer (1a) MEPEG(23) ester: Methoxypolyethylene glycol(23) monomethacrylate, monomer (1a) • MAA: Sodium methacrylate monomer (2a)

[0074] <(a) Components> a-1: Copolymer 1, average proportion of monomer (2a) in the total constituent monomers of component (a): 80 mol% a-2: Copolymer 2, average proportion of monomer (2a) in the total constituent monomers of component (a): 65 mol% a-3: A mixture of copolymer 1 / copolymer 4 = 75 / 25 (mass ratio), with an average proportion of monomer (2a) in the total constituent monomers of component (a) being 82.5 mol%. a-4: A mixture of copolymer 1 / copolymer 4 = 50 / 50 (mass ratio), with an average proportion of monomer (2a) in the total constituent monomers of component (a) being 85 mol%. a-5: A mixture of copolymer 1 / copolymer 2 = 50 / 50 (mass ratio), with an average proportion of monomer (2a) in the total constituent monomers of component (a) being 72.5 mol%. a-6: Copolymer 3, average proportion of monomer (2a) in the total constituent monomers of component (a) is 73 mol%

[0075] <(a') component (comparison component of (a))> a'-1: Copolymer 4, average proportion of monomer (2a) in the total constituent monomers of component (a) 90 mol% a'-2: Copolymer 5, average proportion of monomer (2a) in the total constituent monomers of component (a) 55 mol%

[0076] The average proportion of monomer (2a) in the total constituent monomers of component (a) or component (a') is determined as follows: If one copolymer containing monomer (1a) and monomer (2a) as constituent monomers is used as component (a), the proportion (mol%) of monomer (2a) in the total constituent monomers of this copolymer is taken as the average proportion of monomer (2a); if two or more copolymers containing monomer (1a) and monomer (2a) as constituent monomers are used as component (a), the average value of the proportion of monomer (2a) in the total constituent monomers of the total copolymer is calculated from the proportion (mol%) of monomer (2a) in the total constituent monomers of each copolymer and the proportion (mass%) of each copolymer in component (a), and this is taken as the average proportion of monomer (2a). For example, since a-3 uses two types of copolymers, copolymer 1 (80 mol% monomer (2a)) and copolymer 4 (90 mol% monomer (2a)), in a mass ratio of 75 / 25, the average proportion of monomer (2a) in all constituent monomers of component (a) is 80 × 0.75 + 90 × 0.25 = 82.5.

[0077] <(b) Component> b-1: A mixture of oleyldimethylamine oxide / oleamidopropyldimethylamine oxide / sodium m-xylenesulfonate = 14.7 / 75.5 / 9.8 (mass%), component (b1) • b-2: Cellulose-based thickener, (b2) component, Asukaclean, manufactured by Shin-Etsu Chemical Co., Ltd.

[0078] <(c) component> • c-1: Sodium gluconate · c-2: Sodium tartrate • c-3: Sodium citrate

[0079] [Method for preparing a hydraulic composition] In a forced twin-screw mixer (manufactured by IHI Corporation), coarse aggregate (G), fine aggregate (S1, S2), and hydraulic powder (C) were added according to the formulation shown in Table 1, and dry mixing was performed for 10 seconds. Then, water (W) containing components (a) and / or (a') and component (c) was added to the amounts shown in Table 2, and the mixture was stirred for 90 seconds (stirring speed: 40 rpm). Finally, component (b) was added to the amount shown in Table 2, and the mixture was stirred for another 60 seconds to prepare the hydraulic composition. In Comparative Example 2, the hydraulic composition was prepared without adding component (c). In Table 2, the content of component (a) or (a') represents the content (mass%) relative to the hydraulic powder in the hydraulic composition, the content of component (b) represents the content (mass%) relative to the water in the hydraulic composition, and the content of component (c) represents the content (mass%) relative to the hydraulic powder in the hydraulic composition.

[0080] [Table 1]

[0081] The materials listed in Table 1 are as follows: • Water (W): Tap water • High-early-strength Portland cement (C): Manufactured by Taiheiyo Cement Corporation / Sumitomo Osaka Cement Co., Ltd. = 50 / 50 (mass ratio), density 3.14 g / cm³ 3 ·Fine aggregate (S1): Yamasand from Joyo, Kyoto Surface dry density 2.56g / cm 3 • Fine aggregate (S2): Coarse sand from Ibigawa, Gifu Prefecture. Surface dry density: 2.60 g / cm³ 3 • Coarse aggregate (G): Crushed stone 1005 from Ieshima, Hyogo Prefecture, surface dry density 2.60 g / cm³ 3

[0082] [Liquidity Assessment] For each hydraulic composition prepared according to JIS A1150, the temperature was adjusted to the temperature listed in Table 2 (20°C or 30°C). Each hydraulic composition was filled into a slump cone immediately after mixing (0 minutes) and 4 hours after mixing. The slump cone was then lifted, and the time from the start of lifting the slump cone until the hydraulic composition first reached a 500 mm diameter circle drawn on the slump flow plate was measured with a stopwatch. This measured time was defined as the 50 cm flow time. The results are shown in Table 2. The rate of change from the flow time at 20°C to the flow time at 30°C for the hydraulic composition immediately after mixing and for the hydraulic composition 4 hours after mixing is also shown in Table 2. A smaller rate of change indicates that the fluidity of the hydraulic composition is less affected by temperature. For Comparative Examples 3 and 4, the spread of the hydraulic composition did not reach 50 cm, so it is indicated as "not reached" in the table.

[0083] [Evaluation of non-separation in water] In accordance with JSCE-D 104-2007, 800 ml of deionized water was placed in a 1000 ml glass beaker, 500 g of each prepared hydraulic composition was weighed out and divided into 10 portions, and each portion was gently dropped from the water surface using a spatula. The addition of all samples was completed within 30 seconds, and after standing for 3 minutes, approximately 600 ml of the supernatant was collected using a suction device, of which 300 ml was taken out using a graduated cylinder. Using filter paper dried at 105°C for 1 hour, 300 ml of the sampled water was poured in and filtered by suction. The filter paper, with the residue accumulated on top, was transferred to a tray and dried at 105°C for 2 hours. The amount of suspended solids was calculated, and the water non-separation property was evaluated. In this evaluation, samples with a suspended solids amount of 500 mg / L or less were classified as "○" (good water non-separation property), and samples with a suspended solids amount of less than 500 mg / L were classified as "×" (bad water non-separation property), as shown in Table 2.

[0084] [Strength evaluation of test specimens] For each hydraulic composition prepared, test specimens were prepared in accordance with JIS A1132, and cured in a room at a temperature of 20±2℃ to prevent drying until the formwork was removed. After 24 hours from contact with water, the formwork was removed and the strength was tested. The strength of the test specimens was measured according to JIS A1108. The results are shown in Table 2. The target compressive strength after 24 hours was 15 N / mm². 2 The above is preferable.

[0085] [Table 2]

[0086] Examples 1 to 12 show that the rate of change in flow time due to temperature changes is smaller in both immediately after kneading and 4 hours after kneading compared to Comparative Example 1, where the average proportion of copolymer monomer (2a) exceeds 88 mol%. On the other hand, in Comparative Examples 3 and 4, where the average proportion of copolymer monomer (2a) is less than 60 mol%, the spreading of the hydraulic composition could not reach 50 cm even when the amount of copolymer added was increased, and the 24-hour strength was also inferior. Furthermore, in Comparative Example 2, which did not contain component (c), the rate of variation in the flow time after 4 hours due to temperature changes was larger. Furthermore, it can be seen that Examples 1 to 12 exhibit non-separation properties in water.

Claims

1. A hydraulic composition comprising the following components (a), (b), and (c), hydraulic powder, water, and aggregate, wherein the content of component (a) is 0.6% by mass or more and 5.0% by mass or less relative to the hydraulic powder, and the mass ratio (a) / (c) of the content of component (a) to the content of component (c) is 4.5 or more and 20 or less. (a) Components: A copolymer comprising monomer (1a) represented by the following general formula (1a) and monomer (2a) represented by the following general formula (2a) as constituent monomers, wherein the average proportion of monomer (2a) in the total constituent monomers is 60 mol% or more and 88 mol% or less. (b) Ingredients: Thickener (c) Ingredients: One or more selected from gluconic acid and its salts. 【Chemistry 1】 [During the ceremony, R １ａ , R ２ａ : They may be the same or different, and may be a hydrogen atom or a methyl group R ３ａ : Hydrogen atom R ４ａ : Hydrogen atom or alkyl group having 1 to 4 carbon atoms AO: A group selected from ethyleneoxy group and propyleneoxy group. n1: The average number of moles of AO added, a number between 20 and 130. q1: A number between 0 and 2 (inclusive) p1: 0 or 1 This indicates... 【Chemistry 2】 [During the ceremony, R ５ａ 、R ６ａ 、R ７ａ : They may be the same or different, and are a hydrogen atom, a methyl group or (CH ２ ) ｒ COOM ２ where (CH ２ ) ｒ COOM ２ may form an anhydride with COOM １ or another (CH ２ ) ｒ COOM ２ , and in that case, M １ , M ２ do not exist. M １ M ２ : They may be the same or different, and include hydrogen atoms, alkali metals, alkaline earth metals (half an atom), ammonium groups, alkylammonium groups, substituted alkylammonium groups, alkyl groups, hydroalkyl groups, or alkenyl groups. r: A number between 0 and 2 (inclusive) This indicates...

2. The hydraulic composition according to claim 1, wherein the average proportion of monomer (1a) in the total constituent monomers of component (a) is 12 mol% or more and 40 mol% or less.

3. The hydraulic composition according to claim 1 or 2, wherein component (c) is contained in an amount of 0.02% by mass or more and 0.18% by mass or less relative to the hydraulic powder.

4. The hydraulic composition according to claim 1 or 2, wherein component (b) is (b1) an amine oxide type surfactant and an anionic aromatic compound, or (b2) a cellulose-based thickener.

5. The hydraulic composition according to claim 1 or 2, wherein the time it takes for the slump flow measured by the method described in JIS A1150 to reach 50 cm is 15 seconds or more and 45 seconds or less.

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