JP2023028709A - Fluidity-retaining agent composition for hydraulic composition - Google Patents

Abstract

To provide a fluidity-retaining agent composition for a hydraulic composition comprising blast furnace slag in which a hydraulic composition has good initial fluidity and excellent fluidity retention property even when a hydraulic powder containing blast furnace slag is used and to provide a hydraulic composition comprising blast furnace slag.SOLUTION: There is provided a fluidity-retaining agent composition for a hydraulic composition comprising blast furnace slag which comprises cement and blast furnace slag as a hydraulic powder in which the content of blast furnace slag in the hydraulic powder is 5 mass% or more and 60 mass% or less, wherein the fluidity-retaining agent composition comprises a component (A) and a component (B) composed of specific copolymers which differ from each other and the ratio of the content of the component (B) to the total content of the component (A) and the component (B) is 10 mass% or more and 50 mass% or less.SELECTED DRAWING: None

Description

The present invention relates to a fluidity retention agent composition for a hydraulic composition containing blast furnace slag.

Admixtures such as naphthalene-based, melamine-based, aminosulfonic acid-based and polycarboxylic acid-based admixtures are used to impart fluidity to hydraulic compositions such as concrete. Admixtures such as dispersants are required to have various performances such as imparting fluidity to hydraulic compositions, fluidity retention (fluidity retention), prevention of curing delay, etc. Polycarboxylic acid-based admixtures ( Dispersants) have also been proposed to be improved from this point of view.

For example, it has been proposed to use a combination of a plurality of polycarboxylic acid-based polymers in consideration of fluidity, fluid retention, and the like.
In Patent Document 1, a specific monomer (A) such as (meth)acrylic acid and a specific monomer (B) such as an ethylenically unsaturated carboxylic acid derivative having a polyoxyalkylene group are mixed in a specific weight A cement dispersant efficacy enhancer comprising a copolymer obtained by copolymerizing so as to satisfy both the ratio and a specific molar ratio, and the cement dispersant efficacy enhancer and the cement dispersant are combined into a predetermined Disclosed are cement dispersant compositions containing on a weight basis.
In Patent Document 2, a specific monomer 1 represented by general formula (1) and a specific monomer 2 represented by general formula (2) in which the corresponding alcohol compound satisfies specific physical properties are A dispersion-retaining agent for a hydraulic composition comprising a copolymer obtained by polymerization, wherein the proportion of monomer 1 in the constituent monomers of the copolymer is within a specific range, and the proportion of monomer 2 is within a specific range. Dispersion-retaining agents for hydraulic compositions are disclosed, in which a specific monomer is used as at least a part thereof, and the proportion of the monomer having an acid group or its neutralizing group is 5% by weight or less.
Patent Document 3 discloses a copolymer A (copolymer excluding the coalescence B), the specific monomer B1 represented by the general formula (B1) and 2-hydroxyethyl acrylate are polymerized at 95% by weight or more of the constituent monomers to obtain a weight average molecular weight of 6000 to 27000 copolymer B, and an admixture for a hydraulic composition is disclosed.

Blast-furnace slag and fly ash used to be discarded as industrial waste, but mortar and concrete made from cement containing blast-furnace slag and fly ash are generally more expensive than mortar and concrete made from Portland cement. Since it excels in long-term strength for months or more and has excellent durability, it has been used in large quantities year by year as a partial substitute for cement.
The annual amount of _CO2 generated from cement (from energy sources) is a huge amount equivalent to approximately 3% of the annual amount of _CO2 generated in Japan (1.3 billion tons).
By using cement obtained by mixing blast furnace slag or fly ash with Portland cement, it is possible to reduce the CO ₂ intensity required for manufacturing Portland cement. Ground granulated blast furnace slag and ground fly ash will contribute to the reduction of cement CO ₂ by the amount that Portland cement is replaced with. As a result, it becomes possible to reduce the CO ₂ unit consumption for manufacturing Portland cement, and furthermore it becomes possible to reduce the CO ₂ unit consumption of concrete compositions and their hardened bodies such as buildings and civil engineering structures.

JP-A-2001-316151 JP-A-2009-1479 JP 2013-133241 A

In a formulation containing blast-furnace slag as a substitute powder for cement, under conditions where the mass percentage of water and hydraulic powder in the hydraulic composition (water/hydraulic powder ratio) is 50% by mass or less, and where there is little water Since the hydration activity of blast furnace slag is slower than that of cement, the amount of polycarboxylic acid-based dispersant composition required for the hydration reaction tends to be small, resulting in poor fluid retention. In order to solve this problem, a hydrolyzed retention agent is used, but since it hardly adsorbs to cement at the initial stage of contact with water, a large amount of additive is required, which only increases the manufacturing cost of the hardened hydraulic composition. It becomes difficult to control the fluidity of the hydraulic composition slurry, and in some cases, the fluidity of the hydraulic composition slurry increases over time, causing material separation, delay in setting, and a decrease in strength. The inventor has found that.

The present invention provides a hydraulic composition containing blast-furnace slag, which has good initial fluidity and excellent fluidity retention even when a hydraulic powder containing blast-furnace slag is used. and a hydraulic composition containing blast furnace slag.

The present invention includes cement and blast furnace slag as hydraulic powder, and the content of blast furnace slag in the hydraulic powder is 5% by mass or more and 60% by mass or less, fluidity for a blast furnace slag-containing hydraulic composition A retention agent composition comprising:
It contains the following components (A) and (B), and the ratio of the content of component (B) to the total content of components (A) and (B) is 10% by mass or more and 50% by mass or less. The present invention relates to a fluidity retention agent composition for a hydraulic composition containing blast furnace slag.
<(A) Component>
A structural unit (A1) represented by the following formula (A1), a structural unit (A2) represented by the following formula (A2), and optionally a structural unit (A3) represented by the following formula (A3) A polymer, wherein the ratio of the structural unit (A1) to the total of the structural unit (A1), the structural unit (A2) and the structural unit (A3) is 70 mol% or more and 95 mol% or less, and the structural unit (A3) The proportion of the copolymer is 20 mol% or less

[Wherein, R ^1a , R ^3a and R ^5a are the same or different and each represent a hydrogen atom or a methyl group, and R ^2a is an alkyl group having 1 to 4 carbon atoms or an alkyl group having 1 to 4 carbon atoms is a hydroxyalkyl group, R ^4a is a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, and X ¹ is a divalent alkylene group having 1 to 6 carbon atoms, a direct bond or a carbonyl group , na indicates the average number of added moles of ethylene oxide and is a number of 5 or more and 150 or less, and M ¹ indicates a hydrogen atom or a counter ion that becomes a salt. ]
<(B) Component>
A copolymer having a structural unit (B1) represented by the following formula (B1) and a structural unit (B2) represented by the following formula (B2), wherein the structural unit (B1) and the structural unit (B2) A copolymer having a ratio of the structural unit (B1) to the total of 20% by mass or more and 28% by mass or less and a weight average molecular weight of 30000 or more and 60000 or less

[Wherein, R ^1b and R ^2b are the same or different and each represent a hydrogen atom or a methyl group, R ^3b represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, and M ² represents a hydrogen represents an atom or a counter ion to be a salt, X ² represents a divalent alkylene group having 1 to 6 carbon atoms, a direct bond or a carbonyl group, nb represents the average number of added moles of ethylene oxide, 700 The number is greater than or equal to 170 and less than or equal to 170. ]

The present invention also provides a blast-furnace slag-containing hydraulic composition containing hydraulic powder containing cement and blast-furnace slag, water, the component (A), and the component (B),
The content of blast furnace slag in the hydraulic powder is 5% by mass or more and 60% by mass or less, and the ratio of the content of component (B) to the total content of components (A) and (B) is 10% by mass. The present invention relates to a blast furnace slag-containing hydraulic composition having a content of 50% by mass or less.

According to the present invention, even when a hydraulic powder containing blast furnace slag is used, the initial fluidity of the hydraulic composition is good and the fluidity retention is excellent. A property retention agent composition and a hydraulic composition containing blast furnace slag are provided.

The fluidity retainer composition for a blast furnace slag-containing hydraulic composition and the blast furnace slag-containing hydraulic composition of the present invention provide good initial fluidity of the hydraulic composition containing blast furnace slag and fluidity retention. Although the reason why it is excellent is not necessarily clear, it is presumed as follows. Although the fluidity-retaining agent adsorbs slowly to cement and slag, it is presumed that the fluidity is difficult to develop due to the cohesion caused by the progress of the hydration reaction. In the present invention, the use of component (A) and component (B), which are copolymers having excellent kneading properties, as a fluidity-retaining agent makes it possible to maintain fluidity under conditions in which cement and slag are uniformly dispersed. It is surmised that a small amount of the additive acted effectively because the environment was such that the property-retaining agent acted effectively.

<Fluidity retention agent composition for blast furnace slag-containing hydraulic composition>
The fluidity retaining agent composition for a blast furnace slag-containing hydraulic composition of the present invention contains components (A) and (B), and (B) with respect to the total content of components (A) and (B) The content ratio of the component is 10% by mass or more and 50% by mass or less.

Component (A) includes a structural unit (A1) represented by the following formula (A1), a structural unit (A2) represented by the following formula (A2), and optionally a structural unit represented by the following formula (A3). (A3), wherein the ratio of the structural unit (A1) to the total of the structural unit (A1), the structural unit (A2) and the structural unit (A3) is 70 mol% or more and 95 mol% or less; , a copolymer in which the ratio of the structural unit (A3) is 20 mol% or less.

[Wherein, R ^1a , R ^3a and R ^5a are the same or different and each represent a hydrogen atom or a methyl group, and R ^2a is an alkyl group having 1 to 4 carbon atoms or an alkyl group having 1 to 4 carbon atoms is a hydroxyalkyl group, R ^4a is a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, and X ¹ is a divalent alkylene group having 1 to 6 carbon atoms, a direct bond or a carbonyl group , na indicates the average number of added moles of ethylene oxide and is a number of 5 or more and 150 or less, and M ¹ indicates a hydrogen atom or a counter ion that becomes a salt. ]

In formula (A1), R ^1a is preferably a hydrogen atom or a methyl group.
In formula (A1), R ^2a is preferably one or more selected from a methyl group, an ethyl group, a hydroxyethyl group, and a hydroxymethyl group.

The structural unit (A1) is one or more selected from methyl acrylate, ethyl acrylate, methyl methacrylate, ethyl methacrylate, hydroxyethyl acrylic acid, hydroxymethyl acrylic acid, hydroxyethyl methacrylic acid, and hydroxymethyl methacrylic acid. It can be obtained using a monomer.

In formula (A2), R ^3a is preferably a methyl group.
In formula (A2), R ^4a is preferably a hydrogen atom or a methyl group.
In formula (A2), X ¹ is preferably a direct bond or a carbonyl group.
In formula (A2), na is the average number of added moles of ethylene oxide, and from the viewpoint of imparting dispersibility, na is 5 or more, preferably 10 or more, more preferably 15 or more, and 150 or less, preferably 140 or less, It is more preferably 130 or less.

Structural unit (A2) is a corresponding monomer, for example, (1) monoester of polyethylene glycol and acrylic acid or methacrylic acid, (2) one-terminal alkyl-blocked polyethylene glycol such as methoxypolyethylene glycol and acrylic acid or methacrylic acid (3) monoethers of polyethylene glycol with vinyl alcohol, allyl alcohol, methallyl alcohol, or isoprenyl alcohol; It can be obtained using a monomer selected from ethers with allyl alcohol and (5) ethylene oxide adducts with acrylic acid, methacrylic acid, maleic acid, allyl alcohol or methallyl alcohol.

In formula (A3), R ^5a is preferably a hydrogen atom or a methyl group.
In formula (A3), M ¹ is preferably a hydrogen atom or sodium.

The structural unit (A3) can be obtained using a monomer selected from acrylic acid, methacrylic acid, and salts thereof. Salts include, for example, alkali metal salts, alkaline earth metal salts, ammonium salts, mono-, di-, and trialkyl (for example, having 2 or more and 8 or less carbon atoms) ammonium salts in which a hydroxyl group may be substituted.

In the polymer of component (A), the ratio of the structural unit (A1) to the total of the structural unit (A1), the structural unit (A2) and the structural unit (A3) is 70 mol % or more, preferably 75 mol % or more, and preferably 95 mol % or less, more preferably 90 mol % or less, still more preferably 85 mol % or less. This ratio is obtained by [mol % of structural unit (A1)/[mol % of structural unit (A1)+mol % of structural unit (A2)+mol % of structural unit (A3)]]×100.

In the polymer of the component (A), the ratio of the structural unit (A2) to the total of the structural unit (A1), the structural unit (A2) and the structural unit (A3) imparts a steric repulsive force to the hydraulic composition. From the viewpoint of improving dispersibility, the content is preferably 5 mol% or more, more preferably 10 mol% or more, and preferably 30 mol% or less, more preferably 25 mol% or less. This ratio is obtained by [mol % of structural unit (A2)/[mol % of structural unit (A1)+mol % of structural unit (A2)+mol % of structural unit (A3)]]×100.

In the polymer of component (A), the ratio of the structural unit (A3) to the total of the structural unit (A1), the structural unit (A2) and the structural unit (A3) is, from the viewpoint of imparting dispersibility to the hydraulic composition, It is 0 mol % or more, preferably 5 mol % or more, and from the viewpoint of imparting fluid retention properties to the hydraulic composition, it is 20 mol % or less, preferably 15 mol % or less. This ratio is determined by [mol % of structural unit (A3)/[mol % of structural unit (A1)+mol % of structural unit (A2)+mol % of structural unit (A3)]]×100.

The copolymer of component (A) may have a structural unit other than the structural unit (A1), the structural unit (A2), and the structural unit (A3) (hereinafter also referred to as the structural unit (A4)). Examples of the structural unit (A4) include 2-(methacryloyloxy)ethyl phosphate (HEMA-P), allylsulfonic acid, methallylsulfonic acid, and salts thereof such as alkali metal salts and alkaline earth metal salts. , ammonium salts, or amine salts. Further, (meth)acrylamide, N-methyl(meth)acrylamide, N,N-dimethyl(meth)acrylamide, 2-(meth)acrylamide-2-methasulfonic acid, 2-(meth)acrylamide-2-ethanesulfonic acid, Structural units using monomers such as 2-(meth)acrylamido-2-propanesulfonic acid, styrene, and styrenesulfonic acid are included. (Meth)acrylic means acrylic or methacrylic.

When the copolymer of component (A) does not contain the structural unit (A3), the proportion of the structural unit (A1) and the structural unit (A2) in the total structural units is Therefore, it is preferably 80 mol % or more, more preferably 90 mol % or more, and preferably 100 mol % or less.
Further, when the copolymer of the component (A) contains the structural unit (A3), the ratio of the structural unit (A1), the structural unit (A2), and the structural unit (A3) in the total structural units is the hydraulic composition From the viewpoint of fluid retention of the product, the content is preferably 60 mol% or more, more preferably 70 mol% or more, still more preferably 80 mol% or more, and preferably 100 mol% or less.

The copolymer of component (A) has a weight average molecular weight of preferably 15,000 or more, more preferably 20,000 or more, and preferably 100,000 or less, more preferably 80,000 or less, from the viewpoint of imparting fluidity to the hydraulic composition. , more preferably 60,000 or less, still more preferably 55,000 or less. This weight average molecular weight is determined by high-speed GPC (HLC-8320GPC) Tosoh Corporation, detector: RI, column: G4000PWXL+G2500PWXL (anion), mobile phase: 0.2M phosphate buffer/acetonitrile = 9/1, flow rate: 1. 0 ml/min, column temperature: 40°C, standard substance: polyethylene glycol).

Component (B) is a copolymer having a structural unit (B1) represented by the following formula (B1) and a structural unit (B2) represented by the following formula (B2), wherein the structural unit (B1) and It is a copolymer in which the ratio of the structural unit (B1) to the total of the structural units (B2) is 20% by mass or more and 28% by mass or less, and the weight average molecular weight is 30000 or more and 60000 or less.

[Wherein, R ^1b and R ^2b are the same or different and each represents a hydrogen atom or a methyl group, R ^3b represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, and M ² represents a hydrogen atom or a salt counter ion, X ² represents a divalent alkylene group having 1 to 6 carbon atoms, a direct bond or a carbonyl group, nb represents the average number of added moles of ethylene oxide, 100 or more A number less than or equal to 150. ]

In formula (B1), R ^1b is preferably a hydrogen atom or a methyl group.
In formula (B1), ^M2 is preferably a hydrogen atom or sodium.

The structural unit (B1) can be obtained using a monomer selected from acrylic acid, methacrylic acid, and salts thereof. Salts include, for example, alkali metal salts, alkaline earth metal salts, ammonium salts, mono-, di-, and trialkyl (for example, having 2 or more and 8 or less carbon atoms) ammonium salts in which a hydroxyl group may be substituted.

In formula (B2), R ^2b is preferably a hydrogen atom or a methyl group.
In formula (B2), R ^3b is preferably a hydrogen atom or a methyl group.
In formula (B2), X ² is preferably a direct bond or a carbonyl group.
In the formula (B2), nb is the average number of added moles of ethylene oxide, and from the viewpoint of imparting dispersibility at a low addition amount in the hydraulic composition, nb is 70 or more, preferably 80 or more, more preferably 90 or more, More preferably 100 or more, still more preferably 105 or more, and 170 or less, preferably 160 or less, more preferably 150 or less, still more preferably 140 or less, even more preferably 130 or less, still more preferably 125 or less .

Structural unit (B2) is a corresponding monomer, for example, (1) monoester of polyethylene glycol and acrylic acid or methacrylic acid, (2) one-end alkyl-blocked polyethylene glycol such as methoxypolyethylene glycol and acrylic acid or methacrylic acid (3) monoethers of polyethylene glycol with vinyl alcohol, allyl alcohol, methallyl alcohol, or isoprenyl alcohol; It can be obtained using a monomer selected from ethers with allyl alcohol and (5) ethylene oxide adducts with acrylic acid, methacrylic acid, maleic acid, allyl alcohol or methallyl alcohol.

In the copolymer of component (B), the ratio of the structural unit (B1) to the total of the structural unit (B1) and the structural unit (B2) is, from the viewpoint of imparting kneading properties to the hydraulic composition, on a mass basis: 20% by mass or more, preferably 22% by mass or more, and 28% by mass or less, preferably 26% by mass or less. This ratio is determined by [% by mass of structural unit (B1)/[% by mass of structural unit (B1)+% by mass of structural unit (B2)]]×100.

In the copolymer of component (B), the ratio of the structural unit (B2) to the total of the structural unit (B1) and the structural unit (B2) is preferably 70% by mass or more on a mass basis from the viewpoint of imparting dispersibility. , more preferably 72% by mass or more, and preferably 80% by mass or less, more preferably 78% by mass or less. This ratio is determined by [% by mass of structural unit (B2)/[% by mass of structural unit (B1)+% by mass of structural unit (B2)]]×100.

The copolymer of component (B) may have a structural unit other than the structural unit (B1) and the structural unit (B2) [hereinafter also referred to as structural unit (B3)]. Examples of the structural unit (B3) include 2-(methacryloyloxy)ethyl phosphate (HEMA-P), 2-hydroxyethyl acrylate (HEA), methyl acrylate, methyl methacrylate, and 2-hydroxyethyl methacrylate (HEMA). , allylsulfonic acid, methallylsulfonic acid, and salts thereof such as alkali metal salts, alkaline earth metal salts, ammonium salts, or amine salts. Further, (meth)acrylamide, N-methyl(meth)acrylamide, N,N-dimethyl(meth)acrylamide, 2-(meth)acrylamide-2-methasulfonic acid, 2-(meth)acrylamide-2-ethanesulfonic acid, Structural units using monomers such as 2-(meth)acrylamido-2-propanesulfonic acid, styrene, and styrenesulfonic acid are included. (Meth)acrylic means acrylic or methacrylic.

In the copolymer of component (B), the ratio of the structural unit (B1) and the structural unit (B2) in all structural units is preferably 80% by mass or more, from the viewpoint of imparting dispersibility to the hydraulic composition. It is preferably 90% by mass or more, and preferably 100% by mass or less.

The copolymer of component (B) has a weight average molecular weight of 30,000 or more, preferably 35,000 or more, more preferably 40,000 or more, and 60,000 or less, more preferably 55,000, from the viewpoint of imparting dispersibility to the hydraulic composition. 50,000 or less, more preferably 50,000 or less. This weight average molecular weight is measured in the same manner as for the component (A).

In the fluidity retaining agent composition for a blast furnace slag-containing hydraulic composition of the present invention, the component (A) is preferably 0.01% by mass or more, more preferably 0.03% by mass or more, preferably 0.2% by mass or less, more preferably 0.15% by mass or less.

The fluidity retaining agent composition for a blast furnace slag-containing hydraulic composition of the present invention preferably contains component (B) in an amount of 0.005% by mass or more, more preferably 0.005% by mass or more, from the viewpoint of improving the kneading property of the hydraulic composition. contains 0.01% by mass or more, preferably 0.05% by mass or less, more preferably 0.03% by mass or less.

In the fluidity retaining agent composition for a blast furnace slag-containing hydraulic composition of the present invention, the ratio of the content of component (B) to the total content of components (A) and (B) is From the viewpoint of improving kneading properties, 10% by mass or more, preferably 15% by mass or more, more preferably 20% by mass or more, still more preferably 30% by mass or more, and 50% by mass or less, preferably 45% by mass or less, More preferably, it is 40% by mass or less. This ratio is obtained by [content of component (B)/[total content of component (A) and component (B)]]×100.

From the viewpoint of imparting dispersibility to the hydraulic composition, the fluidity retaining agent composition for the blast furnace slag-containing hydraulic composition of the present invention further contains a polycarboxylic acid-based dispersant ((A ) component, excluding component (B)).

Examples of polycarboxylic acid-based dispersants include copolymers of monoesters of polyalkylene glycol and (meth)acrylic acid and carboxylic acids such as (meth)acrylic acid (for example, compounds described in JP-A-8-12397). etc.), a copolymer of an unsaturated alcohol having a polyalkylene glycol and a carboxylic acid such as (meth)acrylic acid, a copolymer of an unsaturated alcohol having a polyalkylene glycol and a dicarboxylic acid such as maleic acid, etc. be able to. Here, (meth)acrylic acid means a carboxylic acid selected from acrylic acid and methacrylic acid.

As the polycarboxylic acid-based dispersant, a copolymer having a structural unit (C1) represented by the following formula (C1) and a structural unit (C2) represented by the following formula (C2) (hereinafter referred to as (C1) component ) is preferred.

[Wherein, R ^1c and R ^2c are the same or different and each represents a hydrogen atom or a methyl group, R ^3c represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, and M ³ represents a hydrogen represents an atom or a counter ion to be a salt, X ³ represents a divalent alkylene group having 1 to 6 carbon atoms, a direct bond or a carbonyl group, AO represents an alkylene oxide, and nc is the average of the alkylene oxide The number of added moles is shown and is a number of 5 or more and 150 or less. ]

In formula (C1), R ^1c is preferably a hydrogen atom or a methyl group.
In formula (C1), ^M3 is preferably a hydrogen atom or sodium.

The structural unit (C1) can be obtained using a monomer selected from acrylic acid, methacrylic acid, and salts thereof. Salts include, for example, alkali metal salts, alkaline earth metal salts, ammonium salts, mono-, di-, and trialkyl (for example, having 2 or more and 8 or less carbon atoms) ammonium salts in which a hydroxyl group may be substituted.

In formula (C2), R ^2c is preferably a hydrogen atom or a methyl group.
In formula (C2), R ^3c is preferably a hydrogen atom or a methyl group.
In formula (C2), X ³ is preferably a direct bond or a carbonyl group.
In formula (C2), AO is preferably ethylene oxide or propylene oxide, more preferably ethylene oxide.
In formula (C2), nc is the average number of added moles of alkylene oxide, and from the viewpoint of imparting dispersibility to the hydraulic composition, it is preferably 5 or more, more preferably 7 or more, and preferably 150 or less, and more It is preferably 130 or less, more preferably 110 or less, even more preferably 90 or less, still more preferably 70 or less, and even more preferably 50 or less.

Structural unit (C2) is a corresponding monomer, for example, (1) monoester of polyethylene glycol and acrylic acid or methacrylic acid, (2) one-end alkyl-blocked polyethylene glycol such as methoxypolyethylene glycol and acrylic acid or methacrylic acid (3) monoethers of polyethylene glycol with vinyl alcohol, allyl alcohol, methallyl alcohol, or isoprenyl alcohol; It can be obtained using a monomer selected from ethers with allyl alcohol and (5) ethylene oxide adducts with acrylic acid, methacrylic acid, maleic acid, allyl alcohol or methallyl alcohol.

In the copolymer of component (C1), the ratio of the structural unit (C1) to the total of the structural unit (C1) and the structural unit (C2) is preferably based on mass from the viewpoint of dispersibility of the hydraulic composition. It is 9% by mass or more, more preferably 10% by mass or more, and preferably 19% by mass or less, more preferably 18% by mass or less. This ratio is determined by [% by mass of structural unit (C1)/[% by mass of structural unit (C1)+% by mass of structural unit (C2)]]×100.

In the copolymer of the component (C1), the ratio of the structural unit (C2) to the total of the structural unit (C1) and the structural unit (C2) is preferably 71% by mass or more on a mass basis from the viewpoint of imparting dispersibility. , more preferably 72% by mass or more, and preferably 91% by mass or less, more preferably 90% by mass or less. This ratio is obtained by [% by mass of structural unit (C2)/[% by mass of structural unit (C1)+% by mass of structural unit (C2)]]×100.

The copolymer of component (C1) may have a structural unit other than the structural unit (C1) and the structural unit (C2) [hereinafter also referred to as structural unit (C3)]. Examples of the structural unit (C3) include 2-(methacryloyloxy)ethyl phosphate (HEMA-P), 2-hydroxyethyl acrylate (HEA), methyl acrylate, methyl methacrylate, and 2-hydroxyethyl methacrylate (HEMA). , allylsulfonic acid, methallylsulfonic acid, and salts thereof such as alkali metal salts, alkaline earth metal salts, ammonium salts, or amine salts. Further, (meth)acrylamide, N-methyl(meth)acrylamide, N,N-dimethyl(meth)acrylamide, 2-(meth)acrylamide-2-methasulfonic acid, 2-(meth)acrylamide-2-ethanesulfonic acid, Structural units using monomers such as 2-(meth)acrylamido-2-propanesulfonic acid, styrene, and styrenesulfonic acid are included. (Meth)acrylic means acrylic or methacrylic.

In the copolymer of the component (C1), the proportion of the structural unit (C1) and the structural unit (C2) in all the structural units is preferably 80% by mass or more, from the viewpoint of imparting dispersibility to the hydraulic composition. It is preferably 90% by mass or more, and preferably 100% by mass or less.

The copolymer of component (C1) has a weight average molecular weight of preferably 20,000 or more, more preferably 30,000 or more, still more preferably 40,000 or more, and preferably 100,000 or less, from the viewpoint of imparting dispersibility to the hydraulic composition. , more preferably 80,000 or less, and still more preferably 60,000 or less. This weight average molecular weight is measured in the same manner as for the component (A).

In the fluidity retention agent composition for the blast furnace slag-containing hydraulic composition of the present invention, when the component (C) is contained, the total content of the component (A), the component (B) and the component (C) (C ) is preferably 30% by mass or more, more preferably 40% by mass or more, still more preferably 45% by mass or more, and preferably 90% by mass, from the viewpoint of imparting dispersibility to the hydraulic composition. % or less, more preferably 85 mass % or less, still more preferably 80 mass % or less, even more preferably 70 mass % or less, and even more preferably 60 mass % or less. This ratio is obtained by [content of component (C)/[total content of component (A), component (B) and component (C)]]×100.

The fluidity retention agent composition for the blast furnace slag-containing hydraulic composition of the present invention contains, as optional components, a retarder, a curing accelerator, an AE agent, an expansion agent, a foaming agent, a thickener, a fluidizing agent, and a foaming agent. Ingredients such as agents, waterproofing agents, antifoaming agents [excluding those corresponding to components (A) to (C)] can be contained.

The fluidity retention agent composition for the blast furnace slag-containing hydraulic composition of the present invention can contain water. The fluidity retention agent composition for the blast furnace slag-containing hydraulic composition of the present invention may be a liquid composition.

The fluidity retaining agent composition for a blast-furnace slag-containing hydraulic composition of the present invention contains cement and blast-furnace slag as hydraulic powder, and the content of blast-furnace slag in the hydraulic powder is 5% by mass or more, Preferably 15% by mass or more, more preferably 30% by mass or more, still more preferably 40% by mass or more, and 60% by mass or less, preferably 50% by mass or less. Blast-furnace slag is a by-product obtained when pig iron is produced in a blast furnace, and includes slow-cooled slag obtained by slow-cooling in air and quench-cooled slag obtained by quenching in water.

<Hydraulic composition containing blast furnace slag>
The present invention provides a blast furnace slag-containing hydraulic composition containing hydraulic powder containing cement and blast furnace slag, water, the above component (A), and the following component (B),
The content of blast furnace slag in the hydraulic powder is 5% by mass or more and 60% by mass or less, and the ratio of the content of component (B) to the total content of components (A) and (B) is 10% by mass. Provided is a blast furnace slag-containing hydraulic composition having a content of at least 50% by mass.

To the blast-furnace slag-containing hydraulic composition of the present invention, the items described for the fluidity-retaining agent composition for the blast-furnace slag-containing hydraulic composition of the present invention can be appropriately applied. For example, specific examples and preferred embodiments of the components (A) and (B) in the hydraulic composition containing blast furnace slag of the present invention are also described in the fluidity retaining agent composition for the hydraulic composition containing blast furnace slag of the present invention. is the same as

Hydraulic powders are powders having physical properties that harden by hydration reaction, and include cement, gypsum, and the like. Cement such as ordinary portland cement, belite cement, moderate heat cement, high-early-strength cement, ultra-high-early-strength cement, and sulfate-resistant cement are preferred, and these are added with posolan action and/or Powder having latent hydraulicity, blast furnace slag cement, fly ash cement, silica fume cement, etc., to which stone powder (calcium carbonate powder) or the like is added may also be used. Here, the hydraulic powder is selected from powder having physical properties such as cement that hardens due to hydration reaction, powder having pozzolanic action, powder having latent hydraulic property, and stone powder (calcium carbonate powder). In the present invention, the amounts thereof are also included in the amount of hydraulic powder. Moreover, when the powder having the property of hardening by hydration contains a high-strength admixture, the amount of the high-strength admixture is also included in the amount of the hydraulic powder. The same applies to parts by mass and mass ratios related to the mass of the hydraulic powder.

The blast-furnace slag-containing hydraulic composition of the present invention contains cement and blast-furnace slag as hydraulic powder. In the blast furnace slag-containing hydraulic composition of the present invention, the content of blast furnace slag in the hydraulic powder is 5% by mass or more, preferably 15% by mass or more, more preferably 30% by mass or more, and still more preferably 40% by mass. % or more and 60 mass % or less, preferably 50 mass % or less. As the blast furnace slag, those described in the flow retainer composition for the blast furnace slag-containing hydraulic composition of the present invention can be used.
The Blaine value of the blast furnace slag is preferably 3000 cm ² /g or more, more preferably 3500 cm ² /g or more, and preferably less than 5000 cm ² /g, more preferably 4500 cm ² /g or less. The Blaine value is a specific surface area measured by the Blaine specific surface area measurement method.

The blast furnace slag-containing hydraulic composition of the present invention can contain an aggregate. The aggregates include aggregates selected from fine aggregates and coarse aggregates. Examples of fine aggregates include those specified by No. 2311 in JISA0203-2014. Fine aggregates include river sand, land sand, mountain sand, sea sand, lime sand, silica sand and their crushed sand, blast furnace slag fine aggregate, ferronickel slag fine aggregate, lightweight fine aggregate (artificial and natural) and recycled Fine aggregate etc. are mentioned. In addition, coarse aggregates include those specified by No. 2312 in JISA0203-2014. For example, 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 aggregate (artificial and natural) and recycled. Coarse aggregate etc. are mentioned. Different types of fine aggregates and coarse aggregates may be mixed and used, or a single type may be used.

In the blast furnace slag-containing hydraulic composition of the present invention, component (A) is preferably added in an amount of 0.01 parts by mass or more based on 100 parts by mass of the hydraulic powder, from the viewpoint of fluid retention of the hydraulic composition. More preferably 0.03 parts by mass or more, still more preferably 0.04 parts by mass or more, still more preferably 0.05 parts by mass or more, and preferably 0.5 parts by mass or less, more preferably 0.4 parts by mass Below, more preferably 0.3 parts by mass or less, still more preferably 0.2 parts by mass or less, still more preferably 0.1 parts by mass or less, still more preferably 0.08 parts by mass or less.

In the blast furnace slag-containing hydraulic composition of the present invention, component (B) is preferably added in an amount of 0.005 parts by mass or more per 100 parts by mass of the hydraulic powder, from the viewpoint of improving the kneading property of the hydraulic composition. , more preferably 0.008 parts by mass or more, even more preferably 0.01 parts by mass or more, and preferably 0.1 parts by mass or less, more preferably 0.08 parts by mass or less, even more preferably 0.05 It is contained in an amount of 0.03 part by mass or less, more preferably 0.03 part by mass or less.

In the hydraulic composition containing blast furnace slag of the present invention, the ratio of the content of component (B) to the total content of components (A) and (B) is, from the viewpoint of improving the kneading property of the hydraulic composition, 10% by mass or more, preferably 15% by mass or more, more preferably 20% by mass or more, still more preferably 30% by mass or more, and 50% by mass or less, preferably 45% by mass or less, more preferably 40% by mass or less be. This ratio is obtained by [content of component (B)/[total content of component (A) and component (B)]]×100.

The blast furnace slag-containing hydraulic composition of the present invention preferably contains the component (C) from the viewpoint of imparting dispersibility to the hydraulic composition. Specific examples and preferred embodiments of the component (C) in the blast-furnace slag-containing hydraulic composition of the present invention are the same as those of the fluidity-retaining agent composition for the blast-furnace slag-containing hydraulic composition of the present invention.
When the blast furnace slag-containing hydraulic composition of the present invention contains component (C), from the viewpoint of imparting dispersibility to the hydraulic composition, component (C) is added to 100 parts by mass of hydraulic powder, preferably 0.03 parts by mass or more, more preferably 0.04 parts by mass or more, still more preferably 0.05 parts by mass or more, and preferably 0.5 parts by mass or less, more preferably 0.4 parts by mass or less, More preferably 0.3 parts by mass or less, still more preferably 0.2 parts by mass or less, still more preferably 0.1 parts by mass or less, and even more preferably 0.09 parts by mass or less.

In the blast-furnace slag-containing hydraulic composition of the present invention, the ratio of the content of component (C) to the total content of components (A), (B), and (C) imparts dispersibility to the hydraulic composition. From the viewpoint of, preferably 30% by mass or more, more preferably 40% by mass or more, still more preferably 50% by mass or more, and preferably 90% by mass or less, more preferably 85% by mass or less, still more preferably 80% by mass Below, more preferably 70% by mass or less, still more preferably 60% by mass or less. This ratio is obtained by [content of component (C)/[total content of component (A), component (B) and component (C)]]×100.

The mass percentage of water and hydraulic powder (water/hydraulic powder ratio) (abbreviated as W/P) in the hydraulic composition containing blast furnace slag of the present invention is preferable from the viewpoint of workability. is 30% by mass or more, more preferably 35% by mass or more, and is preferably 50% by mass or less, more preferably 45% by mass or less from the viewpoint of strength development of the hydraulic composition.
The mass percentage of water and cement (water/cement ratio) (abbreviated as W/C) in the hydraulic composition containing blast furnace slag of the present invention is preferably 75% by mass or more from the viewpoint of workability. More preferably 85% by mass or more, still more preferably 95% by mass or more, and preferably 125% by mass or less, more preferably 115% by mass or less.

When the blast-furnace slag-containing hydraulic composition is concrete, the amount of coarse aggregate used reduces the strength of the hydraulic composition and the amount of hydraulic powder such as cement used. From the viewpoint of improving the 80% or less. Bulk volume is the ratio of the volume of coarse aggregate (including voids) in 1 m ³ of concrete.
Further, when the blast furnace slag-containing hydraulic composition is concrete, the amount of fine aggregate used is preferably 500 kg/m ³ or more, more preferably 600 kg/m ³ from the viewpoint of improving the fillability of the formwork or the like. Above, more preferably 700 kg/m ³ or more, preferably 1,000 kg/m ³ or less, more preferably 900 kg/m ³ or less.
When the blast furnace slag-containing hydraulic composition is mortar, the amount of fine aggregate used is preferably 800 kg/m ³ or more, more preferably 900 kg/m ³ or more, and still more preferably 1,000 kg/m ³ or more, And it is preferably 2,000 kg/m ³ or less, more preferably 1,800 kg/m ³ or less, still more preferably 1,700 kg/m ³ or less.

The hydraulic composition containing blast furnace slag of the present invention may contain, as optional components, a retarder, a curing accelerator, an AE agent, an expansion agent, a foaming agent, a thickener, a fluidizing agent, a foaming agent, a waterproofing agent, and an antifoaming agent. and other components [excluding those corresponding to components (A) to (C)].

A cured body can be obtained by curing the blast furnace slag-containing hydraulic composition of the present invention by a known method. Curing of the hydraulic composition can be carried out in consideration of the use, shape, etc. of the cured body.

<Method for producing blast furnace slag-containing hydraulic composition>
The present invention is a method for producing a blast furnace slag-containing hydraulic composition, comprising mixing cement, blast furnace slag, water, the component (A), and the component (B) as hydraulic powder, ,
The amount of blast furnace slag mixed in the hydraulic powder is 5% by mass or more and 60% by mass or less,
The ratio of the mixed amount of component (B) to the total mixed amount of component (A) and component (B) is 30% by mass or more and 70% by mass or less.
A method for producing a hydraulic composition containing blast furnace slag is provided.
Further, in the method for producing a blast furnace slag-containing hydraulic composition of the present invention, it is preferable to further mix the component (C) from the viewpoint of imparting dispersibility to the hydraulic composition.

To the method for producing the blast-furnace slag-containing hydraulic composition of the present invention, the items described in the fluidity retention agent composition for the blast-furnace slag-containing hydraulic composition and the blast-furnace slag-containing hydraulic composition of the present invention are appropriately applied. be able to. Specific examples and preferred embodiments of the hydraulic powder, the (A) component, the (B) component, and the optional component (C) used in the method for producing the blast furnace slag-containing hydraulic composition of the present invention are described in the present invention. It is the same as the fluidity retention agent composition for the blast-furnace slag-containing hydraulic composition and the blast-furnace slag-containing hydraulic composition. Further, in the fluidity retaining agent composition for the blast-furnace slag-containing hydraulic composition and the blast-furnace slag-containing hydraulic composition of the present invention, the content of each component is replaced with the mixing amount, and the preferred range is the blast-furnace slag of the present invention. It can be applied to the production method of the containing hydraulic composition.

In the method for producing a blast-furnace slag-containing hydraulic composition of the present invention, the ratio of the mixing amount of component (B) to the total mixing amount of components (A) and (B) is effective for improving kneading properties of the hydraulic composition. From the viewpoint of % or less. This ratio is obtained by [mixed amount of component (B)/[total mixed amount of component (A) and component (B)]]×100.

In the method for producing a blast furnace slag-containing hydraulic composition of the present invention, when the component (C) is mixed, the amount of the component (C) mixed with respect to the total amount of the components (A), (B) and (C) mixed is preferably 30% by mass or more, more preferably 40% by mass or more, still more preferably 50% by mass or more, and preferably 90% by mass or less, more preferably from the viewpoint of imparting dispersibility to the hydraulic composition is 85% by mass or less, more preferably 80% by mass or less, even more preferably 70% by mass or less, and even more preferably 60% by mass or less. This ratio is obtained by [mixing amount of component (C)/[total mixing amount of component (A), component (B) and component (C)]]×100.

The method for producing the blast-furnace slag-containing hydraulic composition of the present invention is not restricted by the order of mixing the components, but as a method for obtaining a high effect more easily, for example, cement and blast-furnace slag are mixed as hydraulic powder. and optionally aggregates, and then mixing a kneading liquid containing components (A), (B) and water. For example, cement, blast furnace slag, coarse aggregate, and fine aggregate are mixed for a predetermined time, for example, 5 seconds or more and 60 seconds or less, and a kneading liquid containing (A) component, (B) component, and water is mixed. is mentioned. Mixing can be performed with a known mixer. The kneading liquid may be an aqueous solution or a water suspension.

In the method for producing the blast-furnace slag-containing hydraulic composition of the present invention, the components (A), (B), and optional component (C) are added to the hydraulic powder, respectively, containing the blast-furnace slag of the present invention. It can be mixed so that it becomes the range described in the hydraulic composition.

In the method for producing a blast furnace slag-containing hydraulic composition of the present invention, optional components include a retarder, a curing accelerator, an AE agent, an expansion agent, a foaming agent, a thickener, a fluidizing agent, a foaming agent, a waterproofing agent, Components such as antifoaming agents [excluding those corresponding to components (A) to (C)] can be mixed.

In the method for producing a blast-furnace slag-containing hydraulic composition of the present invention, water and hydraulic powder are abbreviated as the mass percentage of water and hydraulic powder (water/hydraulic powder ratio) (W/P). ) is preferably 30% by mass or more, more preferably 35% by mass or more, and preferably 50% by mass or less, more preferably 45% by mass or less, from the viewpoint of workability.
In the method for producing a blast-furnace slag-containing hydraulic composition of the present invention, water and cement are mixed, and the mass percentage of water and cement (water/cement ratio) (abbreviated as W/C) is determined from the viewpoint of workability. , preferably 75% by mass or more, more preferably 85% by mass or more, still more preferably 95% by mass or more, and preferably 125% by mass or less, more preferably 115% by mass or less.

The following components were used as components (A), (B) and (C).

<(A) Component>
· A-1: Hydroxyethyl acrylic acid / MEPEG (9) ester = 85/15 (mol%) = 57/43 (mass%) copolymer, weight average molecular weight 23000
· A-2: Hydroxyethyl acrylic acid / MEPEG (23) ester = 85/15 (mol%) = 37.1/62.9 (mass%) copolymer, weight average molecular weight 40000
A-3: copolymer of methyl acrylate/MEPEG (120) ester/methacrylic acid = 70/10/20 (mol%) = 9.7/87.5/2.8 (mass%), weight average molecular weight 53000

<(B) Component>
B-1: methacrylic acid / MEPEG (120) ester = 23.2/76.8 (mass%) = 95/5 (mol%) copolymer, sodium salt, weight average molecular weight 44000

<(C) Component>
・ C-1: Polycarboxylic acid-based dispersant, FC900, manufactured by Nippon Shokubai Co., Ltd.

The monomers of each of the above copolymers are as follows.
- MEPEG (9) ester: methoxypolyethylene glycol (9) monomethacrylate (the number in parentheses is the average number of added moles of ethylene oxide; the same shall apply hereinafter)
・MEPEG (23) ester: methoxypolyethylene glycol (23) monomethacrylate ・MEPEG (120) ester: methoxypolyethylene glycol (120) monomethacrylate

<Production Example 1: Production of copolymer A-1>
Copolymer A-1 was produced as follows.
463.19 g of water was introduced into a glass reaction vessel (four-necked flask) equipped with a stirrer, the contents were replaced with nitrogen while stirring, and the temperature was raised to 70° C. in a nitrogen atmosphere. Monomers of 188.26 g of ω-methoxypolyethylene glycol monomethacrylate (average number of added moles of ethylene oxide: 9, water content: 10%, purity: 93.6%) and 210.19 g of 2-hydroxyethyl acrylate (indicated as HEA in the table) body mixture, an aqueous solution obtained by dissolving 5.65 g of 3-mercaptopropionic acid (manufactured by Sigma-Aldrich Japan Co., Ltd., reagent) in 30 g of water, and an aqueous solution of ammonium persulfate (I) [ammonium persulfate (manufactured by Wako Pure Chemical Industries, Ltd., Reagent) 8.74 g dissolved in 40 g of water] were started dropping at the same time. was added dropwise over 0.5 hours. After that, it was aged at 70° C. for 1 hour. After the aging was completed, the product was neutralized with a 20% aqueous sodium hydroxide solution to obtain an aqueous solution (solid content: 40% by weight) containing copolymer A-1 (weight average molecular weight: 23,000).

Other copolymers in Table 1 were also produced in the same manner as above, except that the types and amounts of monomers used were changed. Table 1 shows the monomer composition and weight average molecular weight of components (A) and (B).

(1-1) Preparation of fluidity retention agent composition for blast furnace slag-containing hydraulic composition and the ratio of the content of component (C) to the total content of components (A), (B) and (C) are as shown in Table 3, and blast furnace slag A fluid retention agent composition was prepared for the contained hydraulic composition. The total content of components (A), (B) and (C) in the fluidity retaining agent composition for blast furnace slag-containing hydraulic composition is 0.12 to 0.18% by mass.

(2-1) Preparation of mortar Using a mortar mixer (manufactured by Dalton Co., Ltd., universal mixer model: 5DM-03-γ), cement (C), blast furnace slag, fine Aggregate (S) was added and dry kneading was performed for 10 seconds at a low speed rotation (63 rpm) of a mortar mixer, and kneading water (W) containing the fluidity retaining agent composition for the prepared blast furnace slag-containing hydraulic composition was prepared. added. Then, main kneading was performed for 120 seconds at a low speed rotation (63 rpm) of a mortar mixer to prepare mortar. The mortar formulation conditions are such that the contents of the components (A), (B), and (C) are water The amount shown in Table 3 was added to the kneading water with respect to 100 parts by mass of the hard powder.

The ingredients used for the preparation of the mortar are as follows.
- Water (W): Tap water was used.
・ Cement (C): Ordinary Portland cement (mixed of two types: Taiheiyo cement / Sumitomo Osaka cement = 1/1, mass ratio) Density 3.16 g / cm ³
・Blast furnace slag: ground blast furnace slag, manufactured by Esment Kanto Co., Ltd., Blaine value 3800 cm ² /g
・Fine aggregate (S): mountain sand from Joyo, density 2.55 g/cm ³

(2-2) Fluidity evaluation of mortar According to the test method (flow test) of JIS R 5201, fluidity immediately after kneading (2 minutes after the start of kneading), fluidity after 30 minutes from kneading, and 60 minutes after kneading. Fluidity after 90 minutes from kneading was evaluated. Table 3 shows the results. The start of kneading is the time when the cement and the kneading water are first brought into contact with each other by adding the kneading water (W) to the mortar mixer.

In Table 3, the comparative examples whose mortar flow result is "separated" were confirmed to have separated the mortar material, so fluidity was not evaluated.

In Table 3, in comparison with the comparative examples, the examples of the present invention have good initial fluidity and excellent fluid retention after 90 minutes from immediately after kneading, and thus are excellent in workability.
Further, in Table 3, Comparative Examples 2, 5 and 8 are not preferable because the fluidity of the mortar increases with time, causing material separation and delay in setting.

Claims (12)

A fluidity-retaining agent composition for a blast-furnace slag-containing hydraulic composition, which contains cement and blast-furnace slag as hydraulic powder, and the content of blast-furnace slag in the hydraulic powder is 5% by mass or more and 60% by mass or less. and
It contains the following components (A) and (B), and the ratio of the content of component (B) to the total content of components (A) and (B) is 10% by mass or more and 50% by mass or less. A fluidity retention agent composition for a hydraulic composition containing blast furnace slag.
<(A) Component>
A structural unit (A1) represented by the following formula (A1), a structural unit (A2) represented by the following formula (A2), and optionally a structural unit (A3) represented by the following formula (A3) A polymer, wherein the ratio of the structural unit (A1) to the total of the structural unit (A1), the structural unit (A2) and the structural unit (A3) is 70 mol% or more and 95 mol% or less, and the structural unit (A3) The proportion of the copolymer is 20 mol% or less

[Wherein, R ^1a , R ^3a and R ^5a are the same or different and each represent a hydrogen atom or a methyl group, and R ^2a is an alkyl group having 1 to 4 carbon atoms or an alkyl group having 1 to 4 carbon atoms is a hydroxyalkyl group, R ^4a is a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, and X ¹ is a divalent alkylene group having 1 to 6 carbon atoms, a direct bond or a carbonyl group , na indicates the average number of added moles of ethylene oxide and is a number of 5 or more and 150 or less, and M ¹ indicates a hydrogen atom or a counter ion that becomes a salt. ]
<(B) Component>
A copolymer having a structural unit (B1) represented by the following formula (B1) and a structural unit (B2) represented by the following formula (B2), wherein the structural unit (B1) and the structural unit (B2) A copolymer having a ratio of the structural unit (B1) to the total of 20% by mass or more and 28% by mass or less and a weight average molecular weight of 30000 or more and 60000 or less

[Wherein, R ^1b and R ^2b are the same or different and each represent a hydrogen atom or a methyl group, R ^3b represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, and M ² represents a hydrogen represents an atom or a counter ion to be a salt, X ² represents a divalent alkylene group having 1 to 6 carbon atoms, a direct bond or a carbonyl group, nb represents the average number of added moles of ethylene oxide, 70 The number is greater than or equal to 170 and less than or equal to 170. ] The fluidity-retaining agent composition for a blast-furnace slag-containing hydraulic composition according to claim 1, containing 0.01% by mass or more and 0.2% by mass or less of component (A). 3. The fluidity retaining agent composition for a blast furnace slag-containing hydraulic composition according to claim 1 or 2, wherein the weight average molecular weight of component (A) is 15000 or more and 100000 or less. 4. The method according to any one of claims 1 to 3, further comprising (C) a polycarboxylic acid-based dispersant (excluding components (A) and (B)) (hereinafter referred to as component (C)). A fluid retention agent composition for a hydraulic composition containing blast furnace slag as described. The blast furnace slag-containing water according to claim 4, wherein the ratio of the content of component (C) to the total content of components (A), (B) and (C) is 30% by mass or more and 90% by mass or less. A fluid retention agent composition for hard compositions. A blast furnace slag-containing hydraulic composition containing hydraulic powder containing cement and blast furnace slag, water, the following component (A), and the following component (B),
The content of blast furnace slag in the hydraulic powder is 5% by mass or more and 60% by mass or less, and the ratio of the content of component (B) to the total content of components (A) and (B) is 10% by mass. A blast-furnace slag-containing hydraulic composition having a content of at least 50% by mass.
<(A) Component>
A structural unit (A1) represented by the following formula (A1), a structural unit (A2) represented by the following formula (A2), and optionally a structural unit (A3) represented by the following formula (A3) A polymer, wherein the ratio of the structural unit (A1) to the total of the structural unit (A1), the structural unit (A2) and the structural unit (A3) is 70 mol% or more and 95 mol% or less, and the structural unit (A3) The proportion of the copolymer is 20 mol% or less

[Wherein, R ^1a , R ^3a and R ^5a are the same or different and each represent a hydrogen atom or a methyl group, and R ^2a is an alkyl group having 1 to 4 carbon atoms or an alkyl group having 1 to 4 carbon atoms is a hydroxyalkyl group, R ^4a is a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, and X ¹ is a divalent alkylene group having 1 to 6 carbon atoms, a direct bond or a carbonyl group , na indicates the average number of added moles of ethylene oxide and is a number of 5 or more and 150 or less, and M ¹ indicates a hydrogen atom or a counter ion that becomes a salt. ]
<(B) Component>
A copolymer having a structural unit (B1) represented by the following formula (B1) and a structural unit (B2) represented by the following formula (B2), wherein the structural unit (B1) and the structural unit (B2) A copolymer having a ratio of the structural unit (B1) to the total of 20% by mass or more and 28% by mass or less and a weight average molecular weight of 30000 or more and 60000 or less

[Wherein, R ^1b and R ^2b are the same or different and each represent a hydrogen atom or a methyl group, R ^3b represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, and M ² represents a hydrogen represents an atom or a counter ion to be a salt, X ² represents a divalent alkylene group having 1 to 6 carbon atoms, a direct bond or a carbonyl group, nb represents the average number of added moles of ethylene oxide, 70 The number is greater than or equal to 170 and less than or equal to 170. ] 7. The hydraulic composition containing blast furnace slag according to claim 6, wherein the component (A) is contained in an amount of 0.01 parts by mass or more and 0.2 parts by mass or less per 100 parts by mass of the hydraulic powder. The blast furnace slag-containing hydraulic composition according to claim 6 or 7, wherein the component (A) has a weight average molecular weight of 15,000 or more and 100,000 or less. Further, (C) a polycarboxylic acid-based dispersant (excluding components (A) and (B)) (hereinafter referred to as component (C)), according to any one of claims 6 to 8 Hydraulic composition containing blast furnace slag as described. The blast furnace slag-containing water according to claim 9, wherein the ratio of the content of component (C) to the total content of components (A), (B) and (C) is 30% by mass or more and 90% by mass or less. Hard composition. Any one of claims 6 to 11, wherein the mass percentage of water and hydraulic powder (water/hydraulic powder ratio) in the hydraulic composition containing blast furnace slag is 40% by mass or more and 50% by mass or less. The fly ash-containing hydraulic composition according to . The fly ash-containing hydraulic composition according to any one of claims 4 to 7, wherein the blast furnace slag has a Blaine value of less than 5000 cm ² /g.