Hydraulic composition

Abstract

Provided is a hydraulic composition containing the following components (A), (B), (C), and (D) a polycarboxylic acid-based dispersant. Component (A): cement clinker or cement powder. Component (B): one or more selected from minerals, slag, and ash containing less than 2.0 mass% iron in terms of iron oxide and having a Mohs hardness of 1-5. Component (C): a specific compound represented by general formula (1c).

Description

hydraulic composition

[0001] The present invention relates to a hydraulic composition and a method for producing the hydraulic composition.

[0002] BACKGROUND ART Cement concrete is a construction material that is indispensable for the development of mankind, and is produced by mixing mainly Portland cement, water, fine aggregate, and coarse aggregate, molding the mixture, and then hardening the mixture.

[0003] Portland cement is produced from cement clinker, which is obtained by drying, mixing, and firing limestone, clay, silica, and iron materials, among other ingredients. During the firing process, a large amount of CO is released due to the decarbonation of limestone. ２ In recent years, CO emissions in the cement industry have ２ As part of efforts to reduce emissions, the promotion of blended cement, which is made by mixing (latently) hydraulic minerals, slag, or ash instead of cement clinker, is being considered.

[0004] Examples of admixtures to be mixed into blended cement, such as minerals, slag, or ash exhibiting (latent) hydraulic properties, include those with pozzolanic action (e.g., fly ash, silica fume, volcanic ash, clay silica, and calcined clay), those with latent hydraulic properties (e.g., blast furnace slag), and those that react with C3A (tricalcium aluminate) or C4AF (tetracalcium aluminferrate) (e.g., limestone).

[0005] Japanese Patent Application Laid-Open No. 2013-79184 discloses a method for producing hydraulic powder, which includes a step of grinding a hydraulic compound in the presence of an acid salt of a specific compound such as urea and a grinding aid, and which achieves both high grinding efficiency for the hydraulic compound and the production of a hydraulic powder such as cement that improves the compressive strength of the resulting hydraulic composition when hardened. Japanese Patent Application Laid-Open No. 2014-181171 also discloses an additive for hydraulic compositions, which uses a polymer whose adsorption amount to cement and clay satisfies certain conditions, and which can improve the fluidity, retention, and condition of concrete, etc., for hydraulic compositions containing low-quality aggregate, regardless of the content of fine particles, thereby imparting excellent properties to hydraulic compositions such as concrete.

[0006] Summary of the Invention However, when producing blended cement, if raw materials such as cement clinker and admixtures are crushed and mixed together, the admixtures, which are softer than the cement clinker, are excessively atomized, which may result in a decrease in the fluidity (processability) of the hydraulic composition slurry produced from the resulting blended cement.

[0007] To solve the above problems, a common approach is to crush the cement clinker and the admixture separately and then mix them in a later process. However, this requires new equipment for mixing the cement clinker and the admixture and equipment for storing the admixture, which increases investment costs and creates other problems.

[0008] The present invention provides a hydraulic composition having improved fluidity and a method for producing the hydraulic composition.

[0009] In one embodiment, the present invention provides a hydraulic composition containing the following components (A), (B), (C), and (D) a polycarboxylic acid-based dispersant (hereinafter referred to as component (D)): Component (A): cement clinker or cement powder; Component (B): one or more selected from minerals, slag, and ash, containing less than 2.0 mass% iron in terms of iron oxide and having a Mohs hardness of 1 or more and 5 or less; and Component (C): a compound represented by the following general formula (1c):

[0010]

[0011] [In the formula, R １ｃ ~R ４ｃ are each independently a hydrogen atom, an alkyl group having 1 to 2 carbon atoms, an amide group, or -C(=X)N(R ５ｃ ) R ６ｃ R is a group. ５ｃ , R ６ｃ are each independently a hydrogen atom, an alkyl group having 1 to 2 carbon atoms, an amide group, or -C(=X)N(R ７ｃ ) R ８ｃ R is a group. ７ｃ , R ８ｃare each independently a hydrogen atom, an alkyl group having 1 to 2 carbon atoms, or an amide group. X is an oxygen atom, a sulfur atom, or NH. R bonded to different N atoms １ｃ ~R ４ｃ may be bonded to each other to form a ring. When a molecule contains a plurality of Xs, the Xs may be the same or different. ５ｃ ~R ８ｃ If it contains, R ５ｃ ~R ８ｃ may be the same or different.

[0012] In another embodiment, the present invention provides a hydraulic composition comprising the above-mentioned components (A), (B), (C) and (D).

[0013] In another embodiment, the present invention provides a method for producing a hydraulic composition, which comprises mixing the above-mentioned components (A), (B), (C), (D) and (E) water.

[0014] According to the present invention, a hydraulic composition having improved fluidity and a method for producing the hydraulic composition are provided.

[0015] Modes for Carrying Out the Invention In recent years, the SDGs have been advocated for the realization of a sustainable society. The present invention contributes to improving the workability of hydraulic compositions using blended cement, and is considered to be a technology that can contribute to the achievement of SDGs Nos. 9, 11, 12, and 13, for example.

[0016] The inventors have discovered that adding a specific compound represented by the general formula (1c) (component (C)) during mixing or grinding of clinker or Portland cement with admixtures suppresses a decrease in fluidity of hydraulic composition slurries produced using the finely divided admixtures. While the reason for this effect is unclear, it is speculated as follows. The decrease in fluidity of slurries produced using the admixtures is thought to be due to electrostatic aggregation between the admixtures and cement particles containing cations formed by metal cations, such as calcium ions, or silanol hydroxyl groups that ionize and become negatively charged under basic conditions. Component (C) exhibits high affinity for metal cations due to its close heteroatoms. Furthermore, by enhancing hydrogen-bonding interaction with water molecules through polarization of carbonyl groups, etc., it is thought to promote water wetting of the surfaces of the cement and admixtures, thereby reducing the electrostatic forces that initiate aggregation, thereby reducing aggregation between the cement particles and admixtures and improving the fluidity of the slurry. Furthermore, the reason why the decrease in fluidity of the slurry is effectively suppressed, particularly when used in combination with the polycarboxylic acid dispersant, which is component (D), is thought to be because the polycarboxylic acid dispersant tends to reduce the surface tension of water, and a synergistic effect is obtained by hydrating the surface of the admixture prior to aggregation due to electrostatic force. However, the hydraulic composition and the method for producing the hydraulic composition of the present invention are not limited to this mechanism in any way.

[0017] <Hydraulic Composition> In an exemplary embodiment, the hydraulic composition of the present invention contains the following components (A), (B), (C), and (D) a polycarboxylic acid-based dispersant (hereinafter referred to as component (D)). Component (A): cement clinker or cement powder Component (B): one or more selected from minerals, slag, and ash, containing less than 2.0% by mass of iron in terms of iron oxide and having a Mohs hardness of 1 or more and 5 or less Component (C): a compound represented by the following general formula (1c):

[0018]

[0019] [In the formula, R １ｃ ~R ４ｃare each independently a hydrogen atom, an alkyl group having 1 to 2 carbon atoms, an amide group, or -C(=X)N(R ５ｃ ) R ６ｃ R is a group. ５ｃ , R ６ｃ are each independently a hydrogen atom, an alkyl group having 1 to 2 carbon atoms, an amide group, or -C(=X)N(R ７ｃ ) R ８ｃ R is a group. ７ｃ , R ８ｃ are each independently a hydrogen atom, an alkyl group having 1 to 2 carbon atoms, or an amide group. X is an oxygen atom, a sulfur atom, or NH. R bonded to different N atoms １ｃ ~R ４ｃ may be bonded to each other to form a ring. When a molecule contains a plurality of Xs, the Xs may be the same or different. ５ｃ ~R ８ｃ If it contains, R ５ｃ ~R ８ｃ may be the same or different.

[0020] In an exemplary embodiment, the hydraulic composition of the present invention may be a hydraulic composition containing a mixed ground product including the components (A), (B), and (C), and the component (D).

[0021] <Component (A)> Component (A) is cement clinker or cement powder. Cement clinker is obtained by burning raw materials such as limestone, clay, iron slag (it may contain gypsum), and has the property of hardening upon reaction with water. In the present invention, the hydraulic powder is a hydraulic substance. Examples of substances that have the property of hardening upon reaction with water include alkaline earth metal oxides, SiO ２ , Al ２ O ３ , Fe ２ O ３ , TiO ２ , P ２ O ５ , ZnO, etc. These generally form hydrates at room temperature or under hydrothermal conditions. For example, cement clinker contains 3CaO.SiO ２ (C3S: alite), 2CaO.SiO２ (C2S: Belite), 3CaO.Al ２ O ３ (C3A: calcium aluminate), 4CaO.Al ２ O ３ Fe ２ O ３ (C4AF: calcium aluminoferrite). Cement clinker contains limestone (CaCO ３ ), clay (Al ２ O ３ , SiO ２ ), silica (SiO ２ ), iron slag (Fe ２ O ３ The cement powder may be a cinder obtained by firing a mixture containing one or more materials selected from the group consisting of various incineration ash containing mineral components, dried powder of lime-treated sewage sludge, and other raw materials generally used in cement production. Examples of the cement powder include cement and Portland cement. Portland cement is produced by pre-pulverizing cement clinker, adding an appropriate amount of gypsum, and finish-pulverizing the mixture to produce a cement having a predetermined specific surface area, for example, a Blaine value of 2,500 cm. ２ / g or more, or BET specific surface area of ​​0.8 m ２ / g or more, and examples thereof include ordinary Portland cement, high-early-strength Portland cement, ultra-high-early-strength Portland cement, sulfate-resistant Portland cement, low-heat Portland cement, white Portland cement, and ecocement (e.g., JIS R 5214, etc.). Among these, from the viewpoint of shortening the time required for the hydraulic composition to reach the required strength, cement selected from early-strength Portland cement, ordinary Portland cement, sulfate-resistant Portland cement, and white Portland cement is preferred, and cement selected from early-strength Portland cement and ordinary Portland cement is more preferred. From the viewpoint of further realizing the effects of the present invention, component (A) is preferably cement clinker or Portland cement, and more preferably cement clinker.

[0022] <Component (B)> Component (B) is one or more selected from minerals, slag, and ash, containing less than 2.0% by mass of iron, calculated as iron oxide, and having a Mohs hardness of 1 to 5. Component (B) may optionally contain iron, and the iron content may be less than 2.0% by mass, calculated as iron oxide. Examples of component (B) include carbonate minerals such as calcium carbonate, magnesite, and dolomite; powders with pozzolanic action, such as fly ash, silica fume, volcanic ash, woody biomass combustion ash, and silicate clay; latent hydraulic powders, such as coal ash, blast furnace slag, and diatomaceous earth; and silicate minerals, such as wollastonite, kaolin, aluminum silicate, clay, talc, mica, calcium silicate, sericite, and bentonite. From the viewpoints of fluidity and strength development of the hydraulic composition slurry, the component (B) is preferably one or more selected from carbonate minerals, latent hydraulic powders, and silicate minerals. Component (B) is preferably the above-mentioned component containing less than 2.0% by mass of iron in terms of iron oxide and having a Mohs hardness of from 1 to 5. From the viewpoint of the atomization-suppressing effect, component (B) more preferably contains one or more selected from calcium carbonate, kaolin, and wollastonite.

[0023] From the viewpoint of the strength development of the hydraulic composition, component (B) contains iron in an amount of preferably 0 mass % or more, more preferably 0.01 mass % or more, calculated as iron oxide, and from the viewpoint of the effect of suppressing particle size reduction, contains less than 2.0 mass %, preferably 1.5 mass % or less, more preferably 1.0 mass % or less. The iron content of component (B) is measured by the following method.

[0024] <Method for measuring the iron content of component (B)> The iron content of component (B) is measured using a powder X-ray analyzer (RINT-2500, manufactured by Rigaku Corporation). The measurement conditions are as follows: target CuKα, tube current 40 mA, tube voltage 200 kV, scan range 5 to 70 deg, 2θ, scan conditions are step scan, step width 0.02°, counting time 2 seconds. Then, "α-corundum (Al ２ O ３ 10 parts by mass of ")" was added to the component (B), and the iron content was calculated as iron oxide equivalent (Fe ) using the peak area of ​​the standard substance as a standard using Rietveld analysis software. ２ O ３The Rietveld analysis software used is PDXL Ver. 1.8 manufactured by Rigaku Corporation.

[0025] From the viewpoint of the strength of the set body of the hydraulic composition, the Mohs hardness of component (B) is 1 or more, preferably 1.5 or more, more preferably 2 or more, and from the viewpoint of the effect of suppressing atomization, it is 5 or less, preferably 4.5 or less, more preferably 4 or less. The Mohs hardness of component (B) is measured by the following method.

[0026] <Method for measuring the Mohs hardness of component (B)> The Mohs hardness of component (B) is determined using the hardness of 10 reference minerals as a scale, and is measured using a Mohs hardness scale (manufactured by Tokyo Science Co., Ltd.). The reference minerals are, in order from soft mineral (Mohs hardness 1) to hard mineral (Mohs hardness 10), talc, gypsum, calcite, fluorite, apatite, orthoclase, quartz, topaz, corundum, and diamond. In this specification, the hardness is determined by the presence or absence of scratches when the target sample is rubbed with these reference minerals. For example, the Mohs hardness of a target sample that is not scratched by calcite but is scratched by fluorite is 3.5.

[0027] <Component (C)> The component (C) is a compound represented by the above general formula (1c). One or more types of component (A) can be used. In general formula (1c), R １ｃ ~R ４ｃ are each independently a hydrogen atom, an amide group, or —C(═X)N(R ５ｃ ) R ６ｃ In general formula (1c), R is preferably a group or an alkyl group having 1 to 2 carbon atoms, and more preferably a hydrogen atom or an amide group. ５ｃ , R ６ｃ are each independently a hydrogen atom, an alkyl group having 1 to 2 carbon atoms, an amide group, or —C(═X)N(R ７ｃ ) R ８ｃ In general formula (1c), R is preferably a group, and more preferably a hydrogen atom or an amide group. ７ｃ , R ８ｃFrom the viewpoint of fluidity of the hydraulic composition slurry, each of R is preferably independently a hydrogen atom, an alkyl group having 1 to 2 carbon atoms, or an amide group, and more preferably a hydrogen atom or an amide group. ５ｃ ~R ８ｃ If it contains, R ５ｃ ~R ８ｃ may be the same or different. In general formula (1c), X is preferably an oxygen atom, a sulfur atom, or NH, more preferably an oxygen atom or NH, from the viewpoint of fluidity of the hydraulic composition slurry. When the compound represented by general formula (1c) contains multiple Xs in one molecule, Xs may be the same or different.

[0028] In the hydraulic composition of the present invention, the mass ratio (aB) / (aA) of the amount (aA) of adsorption of component (C) to component (A) and the amount (aB) of adsorption of component (C) to component (B) is preferably 1.5 or more. In the hydraulic composition of the present invention, the mass ratio (aB) / (aA) of component (C) is preferably 1.5 or more, more preferably 1.6 or more, even more preferably 1.7 or more, and even more preferably 2 or more, from the viewpoint of fluidity of the hydraulic composition slurry, and is preferably 10.0 or less, more preferably 7.0 or less, even more preferably 4.0 or less, and even more preferably 3.5 or less, from the viewpoint of the particle size reduction suppression effect. The amount (aA) of adsorption of component (C) to component (A) is measured by the following method. The amount (aB) of adsorption of component (C) to component (B) is measured by the same method as below, except that component (A) is replaced with component (B).

[0029] The mass ratio (aB) / (aA) may be the mass ratio (aB) / (aA) of the amount (aA) of the component (C) adsorbed to the component (A) per unit mass of the component (A) to the amount (aB) of the component (C) adsorbed to the component (B) per unit mass of the component (B). Furthermore, the amount (aA) of the component (C) adsorbed to the component (A) or the amount (aB) of the component (C) adsorbed to the component (B) is the amount of the component (C) adsorbed to the component (A) or the component (B) before the components (A) and (B) are mixed.

[0030] <Method for measuring the amount (aA) of component (C) adsorbed to component (A)> All test materials were adjusted to 20° C. in advance. 0.01 g of component (C) was added to a 50 mL centrifuge tube and diluted with water to prepare an aqueous solution of component (C) with a concentration of 400 ppm. Next, 25 g of component (A) was placed in the centrifuge tube and mixed by inversion for 1 minute to prepare a cement paste. The cement paste immediately after preparation was centrifuged at 3,000 rpm for 1 minute, and then the supernatant was filtered using a membrane filter (DISMIC 25HP045AN, manufactured by Advantec Co., Ltd.). The resulting filtrate was diluted 20 times with 0.02 mol / L HClaq. The TOC (mg / L) detected in the diluted filtrate by a combustion catalytic oxidation method using an online total organic carbon meter (TOC-V, manufactured by Shimadzu Corporation) was converted to the concentration of component (C) from a calibration curve prepared by diluting component (C) in advance. The adsorption amount (aA) of component (C) relative to component (A) was calculated from the concentration of the non-adsorbed portion of component (C) relative to component (A).

[0031] Examples of the component (C) include urea and its derivatives, guanidine and its derivatives, and thiourea and its derivatives. Among these, the component (C) is preferably one or more selected from urea and its derivatives, and more preferably one or more selected from urea and its derivatives, in which the mass ratio (aB) / (aA) satisfies the above range, from the viewpoint of the fluidity of the hydraulic composition slurry. More specifically, the component (C) is preferably one or more selected from urea, thiourea, biuret, and guanylthiourea, and more preferably one or more selected from urea and thiourea, from the viewpoint of the fluidity of the hydraulic composition slurry.

[0032] <Component (D)> Component (D) is a polycarboxylic acid dispersant. As the polycarboxylic acid dispersant, a copolymer containing a monomer (1d) represented by the following general formula (1d) as a constituent monomer is preferred from the viewpoint of initial fluidity. As the polycarboxylic acid dispersant, a copolymer containing a monomer (1d) represented by the following general formula (1d) and a monomer (2d) represented by the following general formula (2d) as constituent monomers is more preferred.

[0033]

[0034] [In the formula, R １ｄ , R ２ｄ R: may be the same or different, and may be a hydrogen atom or a methyl group ３ｄ : a hydrogen atom or -(CH ２ ) ｑ (CO) ｐ O (AO) ｎ１ -R ４ｄ R ４ｄ n: a hydrogen atom or an alkyl group having 1 to 4 carbon atoms; AO: a group selected from an ethyleneoxy group and a propyleneoxy group; n1: the average number of moles of AO added, which is a number of 1 to 300; q: a number of 0 to 2; and p: 0 or 1.

[0035]

[0036] [In the formula, R ５ｄ , R ６ｄ , R ７ｄ may be the same or different, and may be a hydrogen atom, a methyl group, or (CH ２ ) ｒ COOM ２ and (CH ２ ) ｒ COOM ２ is COOM １ or other (CH ２ ) ｒ COOM ２ and an anhydride may be formed, in which case the M １ , M ２ does not exist. １ , M ２ : may be the same or different and represents a hydrogen atom, an alkali metal, an alkaline earth metal (1 / 2 atom), an ammonium group, an alkylammonium group, a substituted alkylammonium group, an alkyl group, a hydroalkyl group, or an alkenyl group; and r: a number of 0 or more and 2 or less.

[0037] In general formula (1d), R １ｄ is preferably a hydrogen atom from the viewpoint of fluidity of the hydraulic composition slurry. ２ｄ In view of the fluidity of the hydraulic composition slurry, R is preferably a methyl group. ３ｄis preferably a hydrogen atom from the viewpoint of fluidity of the hydraulic composition slurry. ４ｄ is preferably a hydrogen atom or a methyl group, more preferably a methyl group, from the viewpoint of fluidity of the hydraulic composition slurry. ４ｄ If it contains, R ４ｄ may be the same or different. In general formula (1d), AO is preferably an ethyleneoxy group from the viewpoint of fluidity of the hydraulic composition slurry. AO preferably contains an ethyleneoxy group. When multiple AOs are contained in general formula (1d), the AOs may be the same or different. In general formula (1d), n1 is the average number of moles of AO added, and from the viewpoint of fluidity of the hydraulic composition slurry, it is 1 or more, preferably 5 or more, more preferably 7 or more, and 300 or less, preferably 250 or less, more preferably 200 or less, even more preferably 150 or less, still more preferably 100 or less, still more preferably 70 or less, still more preferably 50 or less, and still more preferably 30 or less. When multiple n1s are contained in general formula (1d), the n1s may be the same or different. In general formula (1d), q is preferably 0 from the viewpoint of fluidity of the hydraulic composition slurry. When multiple qs are contained in general formula (1d), the qs may be the same or different. In the general formula (1d), from the viewpoint of fluidity of the hydraulic composition slurry, p is preferably 1. When the general formula (1d) contains a plurality of p's, the p's may be the same or different.

[0038] In producing the monomer (1d), a sulfonic acid may be used as an acid catalyst. For example, JP-A-2008-214638 describes such a method. In producing the component (D) of the present invention, a mixture containing the monomer (1d) 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.

[0039] In the general formula (2d), from the viewpoint of fluidity of the hydraulic composition slurry, R ５ｄ In the general formula (2d), from the viewpoint of fluidity of the hydraulic composition slurry, R ６ｄ In the general formula (2d), from the viewpoint of fluidity of the hydraulic composition slurry, R７ｄ is preferably a hydrogen atom. １ , M ２ The alkyl group, the hydroalkyl group, and the alkenyl group preferably each have 1 to 4 carbon atoms. １ and M ２ may be the same or different, and are preferably a hydrogen atom, an alkali metal, an alkaline earth metal (1 / 2 atom), an ammonium group, or an alkylammonium group, more preferably a hydrogen atom, an alkali metal, an alkaline earth metal (1 / 2 atom), or an ammonium group, still more preferably a hydrogen atom, an alkali metal, or an alkaline earth metal (1 / 2 atom), and still more preferably a hydrogen atom or an alkali metal. ２ ) ｒ COOM ２ Preferably, r is 1.

[0040] In a copolymer containing monomer (1d) as a constituent monomer, the total amount of monomer (1d) among the constituent monomers is preferably 90% by mass or more, more preferably 92% by mass or more, even more preferably 95% by mass or more, and preferably 100% by mass or less, from the viewpoint of fluidity of a hydraulic composition slurry. This total amount may be 100% by mass. In a copolymer containing monomer (1d) and monomer (2d) as constituent monomers, the total amount of monomer (1d) and monomer (2d) among the constituent monomers is preferably 90% by mass or more, more preferably 92% by mass or more, even more preferably 95% by mass or more, and preferably 100% by mass or less, from the viewpoint of fluidity of a hydraulic composition slurry. This total amount may be 100% by mass.

[0041] In the copolymer containing the monomer (1d) and the monomer (2d) as constituent monomers, the proportion of the monomer (2d) in the total of the monomer (1d) and the monomer (2d) is preferably 50 mol% or more, and preferably 95 mol% or less, more preferably 90 mol% or less, and even more preferably 85 mol% or less, from the viewpoint of fluidity of the hydraulic composition slurry.

[0042] The weight average molecular weight of the polycarboxylic acid dispersant, the copolymer further containing the monomer (1d) as a constituent monomer, and the copolymer further containing the monomer (1d) and the monomer (2d) as constituent monomers is preferably 20,000 or more, more preferably 30,000 or more, even more preferably 40,000 or more, and is preferably 100,000 or less, more preferably less than 100,000, even more preferably 80,000 or less, from the viewpoint of fluidity of the hydraulic composition slurry.

[0043] The weight average molecular weights of the polycarboxylic acid dispersant, the copolymer further containing the monomer (1d) as a constituent monomer, and the copolymer further containing the monomer (1d) and the monomer (2d) as constituent monomers were measured by gel permeation chromatography (GPC) under the following conditions. *GPC conditions Apparatus: GPC (HLC-8320GPC) manufactured by Tosoh Corporation Column: G4000PWXL + G2500PWXL (manufactured by Tosoh Corporation) Eluent: 0.2 M phosphate buffer / CH ３ CN = 9 / 1 Flow rate: 1.0 mL / min Column temperature: 40°C Detection: RI Sample size: 0.2 mg / mL Standard substance: Polyethylene glycol equivalent (monodisperse polyethylene glycol with known molecular weights, molecular weights 250,000, 145,000, 87,500, 46,000, and 24,000)

[0044] As the polycarboxylic acid dispersant, two or more dispersants having different average number of moles of AO added or different ratios of the monomer (1a) and the monomer (2a) may be used.

[0045] <Composition, etc.> The hydraulic composition of the present invention contains the component (A) in an amount of preferably 40 parts by mass or more, more preferably 50 parts by mass or more, even more preferably 60 parts by mass or more, and still more preferably 70 parts by mass or more, relative to 100 parts by mass of the total of the components (A) and (B) in the hydraulic composition, from the viewpoint of the strength development of the hydraulic composition, and preferably 99 parts by mass or less, more preferably 95 parts by mass or less, and even more preferably 90 parts by mass or less, from the viewpoint of reducing the environmental load.

[0046] In the hydraulic composition of the present invention, the content of component (A) is preferably 40% by mass or more, more preferably 50% by mass or more, even more preferably 60% by mass or more, and even more preferably 70% by mass or more, from the viewpoint of the strength development of the hydraulic composition, and is preferably 99% by mass or less, more preferably 95% by mass or less, and even more preferably 90% by mass or less, from the viewpoint of reducing the environmental load.

[0047] The hydraulic composition of the present invention contains the component (B) in an amount of preferably 1 part by mass or more, more preferably 5 parts by mass or more, and even more preferably 10 parts by mass or more, relative to 100 parts by mass of the total of the components (A) and (B) in the hydraulic composition, from the viewpoint of reducing the environmental load, and preferably 60 parts by mass or less, more preferably 50 parts by mass or less, and even more preferably 40 parts by mass or less, from the viewpoint of the strength development of the hydraulic composition.

[0048] In the hydraulic composition of the present invention, the content of component (B) is preferably 1% by mass or more, more preferably 5% by mass or more, and even more preferably 10% by mass or more from the viewpoint of reducing the environmental load, and is preferably 60% by mass or less, more preferably 50% by mass or less, and even more preferably 40% by mass or less from the viewpoint of the strength development of the hydraulic composition.

[0049] The hydraulic composition of the present invention contains the component (C) in an amount of preferably 0.001 part by mass or more, more preferably 0.002 part by mass or more, and even more preferably 0.004 part by mass or more, relative to 100 parts by mass of the total of the components (A) and (B) in the hydraulic composition, from the viewpoint of fluidity of the hydraulic composition slurry, and preferably 0.5 part by mass or less, more preferably 0.4 part by mass or less, and even more preferably 0.3 part by mass or less, from the viewpoint of strength development of the hydraulic composition.

[0050] In the hydraulic composition of the present invention, the content of component (C) is preferably 0.001% by mass or more, more preferably 0.002% by mass or more, and even more preferably 0.004% by mass or more, from the viewpoint of the fluidity of the hydraulic composition slurry, and is preferably 0.5% by mass or less, more preferably 0.4% by mass or less, and even more preferably 0.3% by mass or less, from the viewpoint of the strength development of the hydraulic composition.

[0051] The hydraulic composition of the present invention contains the component (D) in an amount of preferably 0.01 part by mass or more, more preferably 0.1 part by mass or more, and even more preferably 0.2 part by mass or more, relative to 100 parts by mass of the total of the components (A) and (B) in the hydraulic composition, from the viewpoint of fluidity of the hydraulic composition slurry, and preferably 5 parts by mass or less, more preferably 2.5 parts by mass or less, even more preferably 1 part by mass or less, and even more preferably 0.5 parts by mass or less, from the viewpoint of strength development of the hydraulic composition.

[0052] In the hydraulic composition of the present invention, the content of component (D) is preferably 0.01% by mass or more, more preferably 0.1% by mass or more, and even more preferably 0.2% by mass or more, from the viewpoint of the fluidity of the hydraulic composition slurry, and is preferably 5% by mass or less, more preferably 2.5% by mass or less, even more preferably 1% by mass or less, and even more preferably 0.5% by mass or less, from the viewpoint of the strength development of the hydraulic composition.

[0053] In the hydraulic composition of the present invention, the mass ratio of the content of the component (C) to the content of the component (D) ((C) / (D)) is preferably 0.0002 or more, more preferably 0.001 or more, and even more preferably 0.005 or more, from the viewpoint of the fluidity of the hydraulic composition slurry, and is preferably 50 or less, more preferably 10 or less, and even more preferably 2 or less, from the viewpoint of the fluidity of the hydraulic composition slurry.

[0054] <Component (E)> The hydraulic composition of the present invention can further optionally contain (E) water (hereinafter referred to as component (E)). Examples of water as component (E) include tap water, industrial water, supernatant water, sludge water, groundwater, lake water, and river water. The hydraulic composition of the present invention may be a hydraulic composition containing a mixed and ground product containing components (A), (B), and (C), component (D), and component (E).

[0055] When the hydraulic composition of the present invention contains the component (E), the hydraulic composition of the present invention contains the component (E) in an amount of preferably 10 parts by mass or more, more preferably 15 parts by mass or more, even more preferably 20 parts by mass or more, still more preferably 25 parts by mass or more, and still more preferably 30 parts by mass or more, relative to 100 parts by mass of the total of the components (A) and (B) in the hydraulic composition, from the viewpoint of fluidity of the hydraulic composition slurry, and preferably 200 parts by mass or less, more preferably 100 parts by mass or less, even more preferably 80 parts by mass or less, still more preferably 60 parts by mass or less, still more preferably 55 parts by mass or less, still more preferably 50 parts by mass or less, and still more preferably 45 parts by mass or less, from the viewpoint of strength development of the hydraulic composition.

[0056] When the hydraulic composition of the present invention contains component (E), the content of component (E) in the hydraulic composition of the present invention is preferably 10% by mass or more, more preferably 15% by mass or more, and even more preferably 20% by mass or more, from the viewpoint of the fluidity of the hydraulic composition slurry, and is preferably 60% by mass or less, more preferably 50% by mass or less, and even more preferably 45% by mass or less, from the viewpoint of the strength development of the hydraulic composition.

[0057] In the hydraulic composition of the present invention, water and hydraulic powder are mixed so that the water / hydraulic powder ratio (W / C) is preferably 10% by mass or more, more preferably 20% by mass or more, and even more preferably 30% by mass or more from the viewpoint of fluidity of the hydraulic composition slurry, and is preferably 60% by mass or less, more preferably 55% by mass or less, and even more preferably 50% by mass or less from the viewpoint of strength development of the hydraulic composition. Here, the water / hydraulic powder ratio (W / C) is the mass percentage (mass %) of water to hydraulic powder in the hydraulic composition and is calculated by (water / hydraulic powder) x 100. In addition to powders that harden upon hydration reaction, such as cement, if the hydraulic powder contains powders selected from powders with pozzolanic action, powders with latent hydraulic properties, and stone powder (calcium carbonate powder), the amounts of these powders are also included in the amount of hydraulic powder in the present invention. Furthermore, when a powder having the physical property of hardening by hydration reaction contains a high-strength admixture, the amount of the high-strength admixture is also included in the amount of hydraulic powder. This also applies to other parts by mass where the mass of the hydraulic powder is relevant. The hydraulic powder may be a powder containing component (A) and component (B), or may even be a powder consisting of component (A) and component (B).

[0058] <Aggregate> The hydraulic composition of the present invention can optionally contain an aggregate. Examples of the aggregate include aggregates selected from fine aggregates and coarse aggregates. Examples of fine aggregates include those specified under number 2311 in JIS A 0203-2014. Examples of fine aggregates include river sand, land sand, mountain sand, sea sand, lime sand, silica sand, and crushed sands thereof, blast furnace slag fine aggregate, ferronickel slag fine aggregate, lightweight fine aggregate (artificial and natural), and recycled fine aggregate. Examples of coarse aggregates include those specified under number 2312 in JIS A 0203-2014. Examples of coarse aggregates include river gravel, land gravel, mountain gravel, sea gravel, lime gravel, crushed stones thereof, blast furnace slag coarse aggregate, ferronickel slag coarse aggregate, lightweight coarse aggregate (artificial and natural), and recycled coarse aggregate. The fine aggregate and coarse aggregate may be used in a mixture of different types, or a single type may be used.

[0059] When the hydraulic composition of the present invention is concrete, i.e., when it is a hydraulic composition containing components (A) to (E), coarse aggregate and fine aggregate, the amount of coarse aggregate used is preferably 50% or more, more preferably 55% or more, even more preferably 60% or more, in terms of bulk volume, from the viewpoint of strength development of the hydraulic composition, and is preferably 100% or less, more preferably 90% or less, even more preferably 80% or less. ３ In addition, when the hydraulic composition is concrete, that is, when the hydraulic composition contains components (A) to (E), coarse aggregate, and fine aggregate, the amount of fine aggregate used is preferably 500 kg / m from the viewpoint of the strength development of the hydraulic composition. ３ More preferably, 600 kg / m ３ More preferably, 700 kg / m ３ and preferably 1,000 kg / m ３ or less, more preferably 900 kg / m ３ When the hydraulic composition is a mortar, that is, when the hydraulic composition contains components (A) to (E) and fine aggregate, the amount of fine aggregate used is preferably 800 kg / m ３ More preferably, 900 kg / m ３ More preferably, 1,000 kg / m ３ and preferably 2,000 kg / m ３ or less, more preferably 1,800 kg / m ３ More preferably, 1,700 kg / m or less ３ The following is the result.

[0060] <Antifoaming Agent> The hydraulic composition of the present invention may further contain an optional antifoaming agent. As the antifoaming agent, a silicone-based antifoaming agent, a fatty acid ester-based antifoaming agent, or an ether-based antifoaming agent is preferred, with dimethylpolysiloxane being more preferred among the silicone-based antifoaming agents, polyalkylene glycol fatty acid ester being more preferred among the fatty acid ester-based antifoaming agents, and polyalkylene glycol ether being more preferred among the ether-based antifoaming agents.

[0061] The hydraulic composition of the present invention contains an antifoaming agent in an amount of preferably 0.00005 part by mass or more, more preferably 0.0001 part by mass or more, and even more preferably 0.0005 part by mass or more, relative to 100 parts by mass of the total of the components (A) and (B) in the hydraulic composition, from the viewpoint of the strength development of the hydraulic composition, and preferably 0.025 part by mass or less, more preferably 0.005 part by mass or less, and even more preferably 0.001 part by mass or less, from the viewpoint of the fluidity of the hydraulic composition slurry.

[0062] The content of the antifoaming agent in the hydraulic composition of the present invention is preferably 0.00005% by mass or more, more preferably 0.0001% by mass or more, and even more preferably 0.0005% by mass or more, from the viewpoint of the strength development of the hydraulic composition, and is preferably 0.025% by mass or less, more preferably 0.005% by mass or less, and even more preferably 0.001% by mass or less, from the viewpoint of the fluidity of the hydraulic composition slurry.

[0063] The hydraulic composition of the present invention may contain, as optional components, a preservative, a hydraulic composition early strength component, a hardening accelerator, a hardening retarder, an air-enhancing agent, a waterproofing agent, a shrinkage reducing agent, a rust inhibitor, a crack reducing agent, a pH adjuster, and other surfactants.

[0064] The hardened product obtained from the hydraulic composition of the present invention can be used for structures and concrete products. Examples of structures include main parts such as columns, beams, floor plates, and bearing walls of reinforced concrete and steel-framed reinforced concrete buildings, as well as civil engineering structures such as roads, bridges, piers, girders, tunnels, waterways, dams, sewers, breakwaters, and retaining walls. Examples of concrete products include vibration-molded products such as culverts, gutters, and segments, and centrifugally molded products such as poles, piles, and Hume pipes.

[0065] In an exemplary embodiment, the hydraulic composition of the present invention may be a hydraulic composition comprising component (A), component (B), component (C), and component (D). The hydraulic composition of the present invention may also be a hydraulic composition comprising component (A), component (B), component (C), component (D), and component (E) below. The hydraulic composition of the present invention may also be a hydraulic composition comprising further the optional components described above.

[0066] The amounts of the (A), (B), (C), (D), (E) and other optional components in the hydraulic composition of the present invention can be applied by replacing the preferred contents of the hydraulic composition of the present invention with the blending amounts. Furthermore, the mass ratio of the contents of each component in the hydraulic composition of the present invention can be applied by replacing the mass ratio of the blending amounts of each component.

[0067] <Method for producing hydraulic composition> In an exemplary embodiment, the present invention provides a method for producing a hydraulic composition by mixing the above-mentioned components (A), (B), (C), (D) a polycarboxylic acid dispersant, and (E) water. The method for producing a hydraulic composition of the present invention may be a method for producing a hydraulic composition by mixing a mixed and ground product obtained by grinding a mixture containing the components (A) and (B) in the presence of the component (C), the above-mentioned component (D), and the above-mentioned water (E).

[0068] The aspects described for the hydraulic composition of the present invention can be applied to the method for producing the hydraulic composition of the present invention. Components (A) to (E), optional components, preferred aspects, etc. in the method for producing the hydraulic composition of the present invention are the same as those described for the hydraulic composition of the present invention. In the method for producing the hydraulic composition of the present invention, the mixed amounts of components (A) to (E) and the mass ratios of the mixed amounts (for example, mass ratio (C) / (D)) can be applied by replacing the contents of each component described for the hydraulic composition of the present invention with the mixed amounts.

[0069] The method for producing a hydraulic composition of the present invention may, for example, involve pulverizing a mixture containing component (A) and component (B) in the presence of component (C). Pulverizing a mixture containing component (A) and component (B) in the presence of component (C) means pulverizing the mixture while component (C) is present in the mixture. Therefore, the method for producing a hydraulic composition of the present invention may involve mixing a mixture of components (A), (B), and (C), pulverizing the resulting mixture, and mixing the pulverized mixture with component (D) and component (E). Alternatively, the method for producing a hydraulic composition of the present invention may involve adding component (C) to a mixture of components (A) and (B), pulverizing the mixture to which component (C) has been added, and mixing the pulverized mixture obtained by pulverizing the mixture with component (D) and component (E).

[0070] For example, in the method for producing a hydraulic composition of the present invention, a method for adding component (C) to a mixture of components (A) and (B) includes adding a liquid mixture containing component (C), preferably in the form of a solution, by dripping, spraying, or the like. In this case, other components such as an antifoaming agent, water, or a known grinding aid may also be added. When component (C) is a powder, it is preferable to dissolve component (C) in a grinding aid or water and add it to a mixture of components (A) and (B). When adding component (C) to a mixture of components (A) and (B), or when adding component (C) and other components, the final amount to be used may be added all at once or in portions. Furthermore, the components may be added by continuous or intermittent supply. Specifically, component (C) may be added by spraying or supporting it on component (A) or component (B), and mixing or pulverization may be started after all of components (A), (B), and (C) have been added, or component (A) or component (B) and component (C) may be mixed or pulverized for a certain period of time, and then the remaining component (B) or component (A) may be added and mixed or pulverized again. More specifically, the method for producing a hydraulic composition of the present invention may be a method for producing a hydraulic composition comprising mixing a mixture of components (A) and (C) with component (B) or mixing a mixture of components (B) and (C) with component (A) to obtain a pulverized mixture, and then mixing the pulverized mixture with component (D) and component (E).

[0071] In the method for producing a hydraulic composition of the present invention, the conditions for pulverizing a mixture containing components (A), (B), and (C) may be adjusted to obtain powder of an appropriate particle size depending on the raw materials, application, etc. Generally, a powder having a specific surface area and a Blaine value of 2,500 cm ２ / g or more 5,000cm ２ / g or less, and even 3,000 cm ２ / g or more 4,000cm ２ It is preferable to grind the mixture, e.g., clinker, until a powder having a density of 1 / g or less is obtained. The target Blaine value can be obtained, for example, by adjusting the grinding time. A longer grinding time tends to increase the Blaine value, while a shorter grinding time tends to decrease the Blaine value.

[0072] In the method for producing a hydraulic composition of the present invention, the grinding device used to grind the mixture containing component (A) and component (B) is not particularly limited, but examples thereof include a ball mill and a Loess mill, which are commonly used for grinding cement, etc. The material of the grinding media (grinding balls) of the device is preferably one having a hardness equal to or greater than that of the material to be ground (for example, calcium aluminate in the case of cement clinker), and examples of commonly available commercially available materials include steel, stainless steel, alumina, zirconia, titania, and tungsten carbide.

[0073] In the method for producing the hydraulic composition of the present invention, the device for mixing the components (A), (B), (C), (D), and (E), and the mixing device used for mixing the mixed pulverized product containing the components (A), (B), and (C), and the mixture containing the components (D) and (E), are not particularly limited, and examples thereof include hand mixers, Hobart mixers, vertical mixers, tilting mixers, pan mixers, forced twin-shaft mixers, and Dicross mixers, which are commonly used for mixing cement and the like.

[0074] In the method for producing a hydraulic composition of the present invention, the component (D) may be dissolved in the component (E) and then added to and mixed with the ground mixture of the components (A) and (B) to which the component (C) has been added, or the component (D) may be added after mixing the components (E) and then further mixed. Also, when the component (D) is in powder form, the ground mixture of the components (A) and (B) to which the component (C) has been added may be mixed with the component (D), and then the component (E) may be added and further mixed.

[0075] The following are examples of embodiments of the present invention, and the matters described in relation to the hydraulic composition and the method for producing the hydraulic composition of the present invention can be applied to these embodiments as appropriate.

[0076] <1> A hydraulic composition containing the following components (A), (B), (C), and (D) a polycarboxylic acid-based dispersant: Component (A): cement clinker or cement powder; Component (B): one or more selected from minerals, slag, and ash, containing less than 2.0% by mass of iron in terms of iron oxide and having a Mohs hardness of 1 or more and 5 or less; and Component (C): a compound represented by the following general formula (1c): [In the formula, R １ｃ ~R ４ｃ are each independently a hydrogen atom, an alkyl group having 1 to 2 carbon atoms, an amide group, or -C(=X)N(R ５ｃ ) R ６ｃ R is a group. ５ｃ , R ６ｃ are each independently a hydrogen atom, an alkyl group having 1 to 2 carbon atoms, an amide group, or -C(=X)N(R ７ｃ ) R ８ｃ R is a group. ７ｃ , R ８ｃ are each independently a hydrogen atom, an alkyl group having 1 to 2 carbon atoms, or an amide group. X is an oxygen atom, a sulfur atom, or NH. R bonded to different N atoms １ｃ ~R ４ｃ may be bonded to each other to form a ring. When a molecule contains a plurality of Xs, the Xs may be the same or different. ５ｃ ~R ８ｃ If it contains, R ５ｃ ~R ８ｃ may be the same or different.

[0077] <2> The hydraulic composition according to <1>, wherein the component (A) is preferably cement clinker or Portland cement, and more preferably cement clinker.

[0078] <3> The hydraulic composition according to <1> or <2>, wherein the component (B) is preferably at least one selected from the group consisting of carbonate minerals, latent hydraulic powders, and silicate minerals.

[0079] <4> The hydraulic composition according to any one of <1> to <3>, wherein the component (B) preferably contains at least one selected from calcium carbonate, kaolin, and wollastonite.

[0080] <5> The hydraulic composition according to any one of <1> to <4>, wherein the component (B) contains, in terms of iron oxide, preferably 0% by mass or more, more preferably 0.01% by mass or more, and less than 2.0% by mass, preferably 1.5% by mass or less, more preferably 1.0% by mass or less.

[0081] <6> The hydraulic composition according to any one of <1> to <5>, wherein the Mohs hardness of the component (B) is 1 or more, preferably 1.5 or more, more preferably 2 or more, and 5 or less, preferably 4.5 or less, more preferably 4 or less.

[0082] <7> The hydraulic composition according to any one of the above <1> to <6>, wherein the component (C) is preferably at least one selected from urea and its derivatives, guanidine and its derivatives, and thiourea and its derivatives, more preferably at least one selected from urea and its derivatives, even more preferably at least one selected from urea, thiourea, biuret, and guanylthiourea, and even more preferably at least one selected from urea and thiourea.

[0083] <8> The hydraulic composition according to any one of <1> to <7>, wherein the component (D) is preferably a copolymer containing, as a constituent monomer, a monomer (1d) represented by the following general formula (1d): [In the formula, R １ｄ , R ２ｄ R: may be the same or different, and may be a hydrogen atom or a methyl group ３ｄ : a hydrogen atom or -(CH ２ ) ｑ (CO) ｐ O (AO) ｎ１ -R ４ｄ R ４ｄ n: a hydrogen atom or an alkyl group having 1 to 4 carbon atoms; AO: a group selected from an ethyleneoxy group and a propyleneoxy group; n1: the average number of moles of AO added, which is a number of 1 to 300; q: a number of 0 to 2; and p: 0 or 1.

[0084] [In the formula, R ５ｄ , R ６ｄ , R ７ｄ may be the same or different, and may be a hydrogen atom, a methyl group, or (CH ２ ) ｒ COOM ２ and (CH ２ ) ｒ COOM ２ is COOM １ or other (CH ２ ) ｒ COOM ２ and an anhydride may be formed, in which case the M １ , M ２ does not exist. １ , M ２ : may be the same or different and represents a hydrogen atom, an alkali metal, an alkaline earth metal (1 / 2 atom), an ammonium group, an alkylammonium group, a substituted alkylammonium group, an alkyl group, a hydroalkyl group, or an alkenyl group; and r: a number of 0 or more and 2 or less.

[0085] <9> The hydraulic composition according to any one of <1> to <8>, further comprising (E) water.

[0086] <10> The hydraulic composition according to any one of <1> to <9>, comprising a mixed and ground product containing the components (A), (B), and (C), (D) a polycarboxylic acid dispersant, and (E) water.

[0087] <11> The hydraulic composition according to any one of the above <1> to <10>, wherein the mass ratio (aB) / (aA) of the amount (aA) of the component (C) adsorbed to the component (A) and the amount (aB) of the component (C) adsorbed to the component (B) is preferably 1.5 or more, more preferably 1.6 or more, even more preferably 1.7 or more, still more preferably 2 or more, and is preferably 10.0 or less, more preferably 7.0 or less, even more preferably 4.0 or less, and still more preferably 3.5 or less.

[0088] <12> A hydraulic composition comprising the following components (A), (B), (C), and (D) a polycarboxylic acid-based dispersant: Component (A): cement clinker or cement powder; Component (B): one or more selected from minerals, slag, and ash, containing less than 2.0% by mass of iron in terms of iron oxide and having a Mohs hardness of 1 or more and 5 or less; and Component (C): a compound represented by the above general formula (1c).

[0089] <13> A method for producing a hydraulic composition, comprising mixing the following components: (A) component, (B) component, (C) component, (D) a polycarboxylic acid dispersant (hereinafter referred to as component (D)), and (E) water (hereinafter referred to as component (E)): component (A): cement clinker or cement powder; component (B): one or more selected from minerals, slag, and ash, each containing less than 2.0% by mass of iron in terms of iron oxide and having a Mohs hardness of 1 or more and 5 or less; and component (C): a compound represented by the above general formula (1c).

[0090] <14> A method for producing a hydraulic composition according to <13>, comprising mixing a mixture of the component (A) and the component (C) with the component (B) or mixing a mixture of the component (B) and the component (C) with the component (A) to obtain a mixture obtained by pulverizing the mixture, and mixing the mixture with the component (D) and the component (E).

[0091] <15> The method for producing a hydraulic composition according to the above item <13> or <14>, wherein the component (C) is preferably at least one selected from urea and its derivatives, guanidine and its derivatives, and thiourea and its derivatives, more preferably at least one selected from urea and its derivatives, even more preferably at least one selected from urea, thiourea, biuret, and guanylthiourea, and even more preferably at least one selected from urea and thiourea.

[0092] <16> The method for producing a hydraulic composition according to any one of the above items <13> to <15>, wherein the component (C) is mixed in an amount of preferably 0.001 part by mass or more, more preferably 0.002 part by mass or more, even more preferably 0.004 part by mass or more, and preferably 0.5 part by mass or less, more preferably 0.4 part by mass or less, even more preferably 0.3 part by mass or less, per 100 parts by mass of the total of the components (A) and (B) in the hydraulic composition.

[0093] <17> The method for producing a hydraulic composition according to any one of the above items <13> to <16>, wherein the component (D) is mixed in an amount of preferably 0.01 part by mass or more, more preferably 0.1 part by mass or more, even more preferably 0.2 part by mass or more, and preferably 5 parts by mass or less, more preferably 2.5 parts by mass or less, even more preferably 1 part by mass or less, and even more preferably 0.5 part by mass or less, relative to 100 parts by mass of the total of the components (A) and (B) in the hydraulic composition.

[0094] <18> The method for producing a hydraulic composition according to any one of the above <13> to <17>, wherein the component (E) is mixed in an amount of preferably 10 parts by mass or more, more preferably 15 parts by mass or more, even more preferably 20 parts by mass or more, still more preferably 25 parts by mass or more, still more preferably 30 parts by mass or more, and preferably 200 parts by mass or less, more preferably 100 parts by mass or less, even more preferably 80 parts by mass or less, still more preferably 60 parts by mass or less, still more preferably 55 parts by mass or less, still more preferably 50 parts by mass or less, and still more preferably 45 parts by mass or less, relative to 100 parts by mass of the total of the components (A) and (B) in the hydraulic composition.

[0095] Example <Materials Used> <Component (A)> Ordinary Portland cement (average particle size 21.8 μm, manufactured by Taiheiyo Cement Corporation)

[0096] <Component (B)> B-1: Calcium carbonate fine powder (average particle size 31.3 μm, manufactured by Shimizu Kogyo Co., Ltd.) B-2: Wollastonite (average particle size 15.4 μm, manufactured by Kusaba Chemical Co., Ltd.) B-3: Calcined kaolin C (average particle size 11.6 μm, manufactured by Kusaba Chemical Co., Ltd.) B-4: Calcined talc (average particle size 15.1 μm, manufactured by Kusaba Chemical Co., Ltd.)

[0097] <Component (C)> C-1: 40% urea aqueous solution, obtained by dissolving urea (manufactured by FUJIFILM Wako Pure Chemical Corporation) in ion-exchanged water to a concentration of 40%. C-2: 10% urea ethylene glycol solution, obtained by dissolving urea (manufactured by FUJIFILM Wako Pure Chemical Corporation) in ethylene glycol (manufactured by FUJIFILM Wako Pure Chemical Corporation) to a concentration of 10%. C-3: 10% urea diethylene glycol solution, obtained by dissolving urea (manufactured by FUJIFILM Wako Pure Chemical Corporation) in diethylene glycol (manufactured by FUJIFILM Wako Pure Chemical Corporation) to a concentration of 10%. C-4: Urea (manufactured by FUJIFILM Wako Pure Chemical Corporation). C-5: Thiourea (manufactured by FUJIFILM Wako Pure Chemical Corporation). C-6: Biuret (manufactured by FUJIFILM Wako Pure Chemical Corporation). C-7: 2-imidazolidinone (manufactured by Tokyo Chemical Industry Co., Ltd.). C-8: Guanylthiourea (manufactured by Tokyo Chemical Industry Co., Ltd.) C-9: 1,1,3,3-tetramethylguanidine (manufactured by Tokyo Chemical Industry Co., Ltd.) When component (C) is used in solution, the amount of component (C) (e.g., urea) in the table is the amount of the active ingredient.

[0098] <Component (D)> Methacrylic acid / methoxypolyethylene glycol (25) methacrylate = 75 / 25 mol% copolymer sodium salt, weight average molecular weight 40,000 <Component (E)> Tap water (Wakayama City, Wakayama Prefecture)

[0099] The iron content and Mohs hardness of component (B) shown in Table 1 were measured by the following method.

[0100] <Method for measuring the iron content of component (B)> The iron content of component (B) was measured using a powder X-ray analyzer (RINT-2500, manufactured by Rigaku Corporation). The measurement conditions were as follows: target CuKα, tube current 40 mA, tube voltage 200 kV, scan range 5 to 70 deg, 2θ, scan conditions were step scan, step width 0.02°, and counting time 2 seconds. α-Corundum (Al ２ O ３ 10 parts by mass of ")" was added to the component (B), and the iron content was calculated as iron oxide equivalent (Fe ) using the peak area of ​​the standard substance as a standard using Rietveld analysis software. ２ O ３The Rietveld analysis software used was PDXL Ver. 1.8 manufactured by Rigaku Corporation.

[0101] <Method for Measuring Mohs Hardness of Component (B)> The Mohs hardness of component (B) was measured using a Mohs hardness scale (manufactured by Tokyo Science Co., Ltd.) The reference minerals, in order from soft (Mohs hardness 1) to hard (Mohs hardness 10), were talc, gypsum, calcite, fluorite, apatite, orthoclase, quartz, topaz, corundum, and diamond. The hardness was determined by the presence or absence of scratches when the target sample was rubbed with these reference minerals.

[0102] <Method for Calculating (aB) / (aA) for Component (C)> First, the components (A) and (B) were adjusted to 20°C. 0.01 g of component (C) was added to a 50 mL centrifuge tube and diluted with tap water to prepare an aqueous solution with a component (C) concentration of 400 ppm. 25 g of component (A) or component (B) was added to this aqueous solution and mixed by inversion for 1 minute to prepare a cement paste. The cement paste immediately after preparation was centrifuged at 3,000 rpm for 1 minute, and then the supernatant was filtered using a membrane filter (DISMIC 25HP045AN, manufactured by Advantec Co., Ltd.), and the resulting filtrate was diluted 20 times with 0.02 mol / L HClaq. The diluted filtrate was detected using an online total organic carbon meter (TOC-V, manufactured by Shimadzu Corporation). From the concentration of the non-adsorbed portion of the (C) component relative to the (A) or (B) component, the adsorption amount (aA) or adsorption amount (aB) of the (C) component relative to the (A) or (B) component was calculated. Based on the adsorption amount (aA) of the (C) component obtained in the (A) component and the adsorption amount (aB) of the (C) component obtained in the (B) component, the mass ratio (aB) / (aA) of the adsorption amount of the (C) component in the (B) component relative to the adsorption amount of the (C) component in the (A) component was calculated.

[0103] Example 1 and Comparative Example 1 (1) Pulverization and Mixing of Hydraulic Powder The components (A), (B), and (C) were placed in a mixer (MX-X301, manufactured by Panasonic Corporation) in the parts by mass shown in Table 1, and after stirring for 2 minutes, the mixture was cooled to 20°C to obtain a pulverized mixture containing components (A) and (B). Component (C) was added by spraying to component (B), and mixing or pulverization was started after component (A) was added.

[0104] (2) Method for Producing Hydraulic Composition Slurry Mortar was prepared using the hydraulic powder prepared by method (1) according to the following mortar formulation. Specifically, the pulverized mixture prepared in (1) was mixed so that the total amount of components (A) and (B) was 400 g to prepare a hydraulic composition with the following mortar formulation. All materials were adjusted to 20°C, and the fine aggregate was adjusted to a surface-dried state, and tests were conducted at 20°C. Mortar was prepared by adding the components in the amounts listed in Table 1 using a mortar mixer specified in JIS R 5201 and kneading (60 rpm, 120 seconds). The hydraulic powder prepared by method (1) was dry-mixed with the fine aggregate before addition. Components (D), (E), and the antifoaming agent were mixed before addition.

[0105] <Mortar composition> - Crushed mixture obtained in (1): 400 g - Fine aggregate: 700 g (sand, produced by Joyo, Kyoto Prefecture, surface dry specific gravity 2.50 g / cm ３ ) Tap water: 140g or 200g Antifoaming agent: 0.05g (Antifoaming agent No. 21, manufactured by Kao Corporation)

[0106] (3) Evaluation of fluidity of hydraulic composition slurry The mortar immediately after kneading prepared by the method of (2) was filled into a flow cone (upper diameter 70 mm × lower diameter 100 mm × height 60 mm) described in JIS R 5201, and the mortar flow was measured. The results are shown in Table 1. A hydraulic composition with a large mortar flow is a hydraulic composition with improved fluidity.

[0107]

[0108] In Table 1, Examples 1-1 to 1-10 had improved mortar flow (fluidity of mortar) compared to Comparative Example 1-1. This is thought to be because the combination of component (C) and component (D), which has excellent ability to reduce the surface tension of water, promoted wetting of the surfaces of components (A) and (B) with water, and alleviated the electrostatic force that initiates aggregation, thereby alleviating aggregation of components (A) and (B).

Claims

1. A hydraulic composition comprising the following components (A), (B), (C) and (D) a polycarboxylic acid-based dispersant: Component (A): Cement clinker or cement powder; Component (B): One or more selected from minerals, slag and ash, containing less than 2.0% by mass of iron in terms of iron oxide and having a Mohs hardness of 1 to 5; Component (C): A compound represented by the following general formula (1c): [In the formula, R １ｃ ~R ４ｃ are each independently a hydrogen atom, an alkyl group having 1 to 2 carbon atoms, an amide group, or -C(=X)N(R ５ｃ ) R ６ｃ R is a group. ５ｃ , R ６ｃ are each independently a hydrogen atom, an alkyl group having 1 to 2 carbon atoms, an amide group, or -C(=X)N(R ７ｃ ) R ８ｃ R is a group. ７ｃ , R ８ｃ are each independently a hydrogen atom, an alkyl group having 1 to 2 carbon atoms, or an amide group. X is an oxygen atom, a sulfur atom, or NH. R １ｃ ~R ４ｃ may be bonded to each other to form a ring. When a molecule contains a plurality of Xs, the Xs may be the same or different. ５ｃ ~R ８ｃ If R ５ｃ ~R ８ｃ may be the same or different.

2. A hydraulic composition as described in claim 1, in which the mass ratio (aB) / (aA) of the amount (aA) of the component (C) adsorbed to the component (A) and the amount (aB) of the component (C) adsorbed to the component (B) is 1.5 or more.

3. A hydraulic composition according to claim 1 or 2, wherein component (C) is one or more selected from urea and its derivatives.

4. A hydraulic composition according to any one of claims 1 to 3, comprising a mixed ground product containing the components (A), (B) and (C), (D) a polycarboxylic acid-based dispersant and (E) water.

5. A hydraulic composition comprising the following components (A), (B), (C) and (D) a polycarboxylic acid dispersant: Component (A): Cement clinker or cement powder; Component (B): One or more selected from minerals, slag and ash, containing less than 2.0% by mass of iron in terms of iron oxide and having a Mohs hardness of 1 to 5; Component (C): A compound represented by the following general formula (1c): [In the formula, R １ｃ ~R ４ｃ are each independently a hydrogen atom, an alkyl group having 1 to 2 carbon atoms, an amide group, or -C(=X)N(R ５ｃ ) R ６ｃ R is a group. ５ｃ , R ６ｃ are each independently a hydrogen atom, an alkyl group having 1 to 2 carbon atoms, an amide group, or -C(=X)N(R ７ｃ ) R ８ｃ R is a group. ７ｃ , R ８ｃ are each independently a hydrogen atom, an alkyl group having 1 to 2 carbon atoms, or an amide group. X is an oxygen atom, a sulfur atom, or NH. R １ｃ ~R ４ｃ may be bonded to each other to form a ring. When a molecule contains a plurality of Xs, the Xs may be the same or different. ５ｃ ~R ８ｃ If R ５ｃ ~R ８ｃ may be the same or different.

6. A method for producing a hydraulic composition comprising mixing the following components (A), (B), (C), (D) a polycarboxylic acid-based dispersant (hereinafter referred to as component (D)), and (E) water (hereinafter referred to as component (E)): Component (A): cement clinker or cement powder Component (B): one or more selected from minerals, slag, and ash, containing less than 2.0% by mass of iron in terms of iron oxide and having a Mohs hardness of 1 to 5 Component (C): a compound represented by the following general formula (1c): [In the formula, R １ｃ ~R ４ｃ are each independently a hydrogen atom, an alkyl group having 1 to 2 carbon atoms, an amide group, or -C(=X)N(R ５ｃ ) R ６ｃ R is a group. ５ｃ , R ６ｃ are each independently a hydrogen atom, an alkyl group having 1 to 2 carbon atoms, an amide group, or -C(=X)N(R ７ｃ ) R ８ｃ R is a group. ７ｃ , R ８ｃ are each independently a hydrogen atom, an alkyl group having 1 to 2 carbon atoms, or an amide group. X is an oxygen atom, a sulfur atom, or NH. R １ｃ ~R ４ｃ may be bonded to each other to form a ring. When a molecule contains a plurality of Xs, the Xs may be the same or different. ５ｃ ~R ８ｃ If R ５ｃ ~R ８ｃ may be the same or different.

7. A method for producing a hydraulic composition according to claim 6, comprising mixing a mixture of components (A) and (C) with component (B) or mixing a mixture of components (B) and (C) with component (A) to obtain a mixture, and grinding the mixture, and mixing the mixture with component (D) and component (E).

8. A method for producing a hydraulic composition according to claim 6 or 7, wherein component (C) is one or more selected from urea and its derivatives.

9. A method for producing a hydraulic composition according to any one of claims 6 to 8, wherein the (C) component is mixed in an amount of 0.001 to 0.5 parts by mass per 100 parts by mass of the combined total of the (A) and (B) components.

10. A method for producing a hydraulic composition according to any one of claims 6 to 9, wherein the (D) component is mixed in an amount of 0.01 parts by mass or more and 5 parts by mass or less per 100 parts by mass of the combined total of the (A) and (B) components.

11. A method for producing a hydraulic composition according to any one of claims 6 to 10, wherein component (E) is mixed in an amount of 10 parts by mass or more and 60 parts by mass or less per 100 parts by mass of the total of components (A) and (B).

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