Hydraulic composition

Abstract

To provide a hydraulic composition improved in flowability.SOLUTION: A hydraulic composition contains the following components (A), (B) and (C), and (D) a polycarboxylic acid-based dispersant: (A) a cement clinker or cement powder; (B) one or more selected from minerals, slag and ash containing less than 2.0 mass% of iron in terms of iron oxide and having a Mohs hardness from 1 to 5 inclusive; and (C) a specific compound represented by general formula (1c) in the figure.SELECTED DRAWING: None

Description

[Technical field]

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

[0002] Cement concrete is produced by mixing Portland cement, water, fine aggregate and coarse aggregate, shaping and hardening it, and is an essential construction material for the development of mankind.

[0003] Portland cement is produced from cement clinker, which is obtained by drying, mixing, and firing limestone, clay, silica, and iron raw materials, among other materials, as its main raw material, but a large amount of CO2 is emitted during the firing process due to the decarbonation of limestone. In recent years, as part of efforts to reduce CO2 emissions in the cement industry, there have been considerations of promoting the use of blended cement, which mixes minerals, slag, or ash that exhibit (latent) hydraulic properties instead of cement clinker.

[0004] Admixtures to be mixed into blended cement; minerals, slag, ash, etc. exhibiting (latent) hydraulic properties include, for example, those with pozzolanic action (e.g., fly ash, silica fume, volcanic ash, siliceous clay, calcined clay), those with latent hydraulic properties (e.g., blast furnace slag), and those that react with C3A (tricalcium aluminate) or C4AF (tetracalcium aluminate ferro) (e.g., limestone).

[0005] Patent Document 1 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 good grinding efficiency of 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. Patent Document 2 discloses an additive for hydraulic compositions that uses a polymer that satisfies certain conditions for the amount of adsorption to cement and clay, and that can improve the fluidity, retention, and condition of concrete, etc., for hydraulic compositions that contain low-quality aggregate, regardless of the content of fine particles, and can impart excellent properties to hydraulic compositions such as concrete. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2013-79184 A [Patent Document 2] JP 2014-181171 A Summary of the Invention [Problem to be solved by the invention]

[0007] However, when producing a blended cement, if the 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, and the fluidity (workability) of the hydraulic composition slurry produced from the resulting blended cement may decrease.

[0008] In order to solve the above-mentioned problems, the cement clinker and the mixed materials are often crushed separately and then mixed in a later process. However, this requires new equipment for mixing the cement clinker and the mixed materials and equipment for storing the mixed materials, which results in problems such as increased investment.

[0009] The present invention provides a hydraulic composition having improved fluidity and a method for producing the hydraulic composition. [Means for solving the problem]

[0010] In one embodiment, the present invention provides a hydraulic composition comprising the following components (A), (B), (C), and (D) a polycarboxylic acid dispersant (hereinafter referred to as component (D)). (A) Component: Cement clinker or cement powder (B) Component: One or more selected from minerals, slag, and ash, each of which contains less than 2.0% by mass of iron in terms of iron oxide and has a Mohs hardness of 1 or more and 5 or less. Component (C): A compound represented by the following general formula (1c):

[0011] [ka]

[0012] [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 It 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 It 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 multiple 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.

[0013] In another embodiment, the present invention provides a hydraulic composition comprising the above-mentioned components (A), (B), (C) and (D).

[0014] 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. Effect of the Invention

[0015] According to the present invention, there are provided a hydraulic composition having improved fluidity and a method for producing the hydraulic composition. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] In recent years, the SDGs have been proposed to realize 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 SDGs No. 9, 11, 12, and 13, for example.

[0017] The inventors have found that by adding a specific compound represented by the above general formula (1c) as component (C) when mixing or grinding clinker or Portland cement with an admixture, the decrease in fluidity of the hydraulic composition slurry produced using the finely-divided mixed cement is suppressed. The reason why such an effect is exhibited is not entirely clear, but is presumed to be as follows. The decrease in fluidity of slurries made with blended cement is believed to be due to electrostatic coagulation between the admixture and cement particles that have cations formed by metal cations such as calcium ions, or silanol hydroxyl groups that ionize and become negatively charged under basic conditions. Component (C) has a heteroatom in close proximity and shows high affinity for metal cations, and by increasing the hydrogen bonding interaction force with water molecules through the polarization of carbonyl groups, etc., it is believed to promote the wetting of the cement surface and the admixture surface with water, and by mitigating the electrostatic force that is the starting point of coagulation, it is believed to mitigate the coagulation of the cement particles and the admixture, thereby improving the fluidity of the slurry. In addition, the reason why the decrease in the fluidity of the slurry is effectively prevented, particularly when used in combination with the polycarboxylic acid dispersant, component (D), is believed to be because the polycarboxylic acid dispersant tends to reduce the surface tension of water, resulting in a synergistic effect by hydrating the surface of the admixture prior to aggregation due to electrostatic forces. However, the hydraulic composition and the method for producing the hydraulic composition of the present invention are not limited to this mechanism at all.

[0018] <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 dispersant (hereinafter referred to as component (D)). (A) Component: Cement clinker or cement powder (B) Component: One or more selected from minerals, slag, and ash, each of which contains less than 2.0% by mass of iron in terms of iron oxide and has a Mohs hardness of 1 or more and 5 or less. Component (C): A compound represented by the following general formula (1c):

[0019] [ka]

[0020] [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 It 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 It 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 4cmay be bonded to each other to form a ring. When a molecule contains multiple 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.

[0021] In an exemplary embodiment, the hydraulic composition of the present invention may be a hydraulic composition containing a mixed ground product including the (A) component, the (B) component, and the (C) component, and the (D) component.

[0022] <Component (A)> Component (A) is cement clinker or cement powder. Cement clinker is obtained by burning raw materials such as limestone, clay, and iron slag (it may also contain gypsum), and has the property of hardening when it reacts with water. In the present invention, the hydraulic powder is a hydraulic material. Examples of materials that react with water to harden include oxides of alkaline earth metals, SiO2, Al2O3, Fe2O3, TiO2, P2O5, ZnO, and other oxides. These generally form hydrates at room temperature or under hydrothermal conditions. For example, cement clinker contains 3CaO·SiO2 (C3S: alite), 2CaO·SiO2 (C2S: belite), 3CaO·Al2O3 (C3A: calcium aluminate), and 4CaO·Al2O3·Fe2O3 (C4AF: calcium aluminoferrite) as components. The cement clinker may be a sintered block obtained by firing a mixture containing one or more materials selected from limestone (CaCO3), clay (Al2O3, SiO2), silica (SiO2), iron slag (Fe2O3), various incineration ashes containing mineral components, dried powder of lime-treated sewage sludge, and other raw materials generally used for cement production. The cement powder may be cement, or even Portland cement. Portland cement is prepared by pre-pulverizing cement clinker, adding an appropriate amount of gypsum, and finish-pulverizing the mixture to obtain a powder with a specific surface area of, for example, 2,500 cm2 (Blaine value). 2 / g or more, or BET specific surface area of ​​0.8 m 2 Examples of such cement include ordinary Portland cement, early strength Portland cement, extra 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 a required strength, a cement selected from early strength Portland cement, ordinary Portland cement, sulfate resistant Portland cement, and white Portland cement is preferred, and a cement selected from early strength Portland cement and ordinary Portland cement is more preferred. From the viewpoint of achieving the effects of the present invention more effectively, the component (A) is preferably cement clinker or Portland cement, and more preferably cement clinker.

[0023] <(B) component> Component (B) is one or more selected from minerals, slag, and ash, which contain less than 2.0% by mass of iron, calculated as iron oxide, and have a Mohs hardness of from 1 to 5. Component (B) may optionally contain iron, and may contain less than 2.0% by mass of iron, calculated as iron oxide. Examples of component (B) include carbonate minerals such as calcium carbonate, magnesite, and dolomite; powders having pozzolanic action such as fly ash, silica fume, volcanic ash, woody biomass combustion ash, and silicate earth; 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 viewpoint of fluidity and strength development of the hydraulic composition slurry, one or more types selected from carbonate minerals, latent hydraulic powders, and silicate minerals are preferred. Component (B) is preferably one of the above components that contains less than 2.0% by mass of iron in terms of iron oxide and has a Mohs hardness of 1 or more and 5 or less. From the viewpoint of the effect of suppressing atomization, it is more preferable that the (B) component contains one or more selected from calcium carbonate, kaolin, and wollastonite.

[0024] From the viewpoint of strength development of the hydraulic composition, the 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 microparticulation, the amount is less than 2.0 mass %, preferably 1.5 mass % or less, more preferably 1.0 mass % or less. The iron content of the component (B) is measured by the following method.

[0025] <Method for measuring the iron content of component (B)> The iron content of component (B) is measured using a powder X-ray device (RINT-2500, manufactured by Rigaku Corporation). The measurement conditions are CuKα target, 40mA tube current, 200kV tube voltage, 5-70deg, 2θ scanning range, step scanning, 0.02° step width, 2 seconds counting time. Then, 10 parts by mass of α-corundum (Al2O3) is added to component (B) as a standard substance, and the iron content is calculated in terms of iron oxide (Fe2O3) using Rietveld analysis software based on the peak area of ​​the standard substance. The Rietveld analysis software used is PDXL Ver.1.8 manufactured by Rigaku Corporation.

[0026] From the viewpoint of the strength of the hydraulic composition hardened body, the Mohs hardness of the (B) component 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 the (B) component is measured by the following method.

[0027] <Method for measuring Mohs hardness of component (B)> The Mohs hardness of the (B) component is a hardness obtained by using the hardness of 10 kinds of standard minerals as a scale, and is measured using a Mohs hardness tester (manufactured by Tokyo Science Co., Ltd.). The standard minerals are, in order from soft minerals (Mohs hardness 1) to hard minerals (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 standard minerals. For example, the Mohs hardness of a target sample that is not scratched by calcite but is scratched by fluorite is 3.5.

[0028] <(C) component> The component (C) is a compound represented by the above general formula (1c). The component (A) can be used alone or in combination of two or more kinds. In general formula (1c), R 1c ~R 4c From the viewpoint of fluidity of the hydraulic composition slurry, each independently represents a hydrogen atom, an amide group, -C(=X)N(R 5c )R 6c A group or an alkyl group having 1 to 2 carbon atoms is preferable, and a hydrogen atom or an amide group is more preferable. In general formula (1c), R 5c , R 6c From the viewpoint of fluidity of the hydraulic composition slurry, each independently represents a hydrogen atom, an alkyl group having 1 to 2 carbon atoms, an amide group, or -C(=X)N(R 7c )R 8c A group is preferred, and a hydrogen atom or an amide group is more preferred. In general formula (1c), R 7c , R 8c From the viewpoint of fluidity of the hydraulic composition slurry, each of the groups independently represents preferably 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. In addition, the compound represented by the general formula (1c) may have multiple R 5c ~R 8c If it contains, R 5c ~R 8c may be the same or different. In the 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 the general formula (1c) contains a plurality of X in one molecule, X may be the same or different.

[0029] In the hydraulic composition of the present invention, 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. In the hydraulic composition of the present invention, the component (C) has a mass ratio (aB) / (aA) of 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 the fluidity of the hydraulic composition slurry, and from the viewpoint of the microparticulation suppression effect, it 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. The amount (aA) of component (C) adsorbed to component (A) was measured by the following method. The amount (aB) of component (C) adsorbed to component (B) was measured by the same method as below, except that component (A) was replaced with component (B).

[0030] 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) in the component (A) per unit mass to the amount (aB) of the component (C) adsorbed to the component (B) in the component (B) per unit mass. The adsorption amount (aA) of the component (C) to the component (A) or the adsorption amount (aB) of the component (C) to the component (B) is the adsorption amount of the component (C) in the component (A) or the component (B) before the components (A) and (B) are mixed.

[0031] <Method for measuring the amount (aA) of component (C) adsorbed to component (A)> All test materials are adjusted to 20°C in advance before use. Add 0.01 g of component (C) to a 50 mL centrifuge tube and dilute with water to prepare an aqueous solution of component (C) with a concentration of 400 ppm. Next, 25 g of component (A) is placed in this centrifuge tube and mixed by inversion for 1 minute to prepare a cement paste. The cement paste immediately after preparation is centrifuged at 3,000 rpm for 1 minute, and then the supernatant is filtered using a membrane filter (DISMIC 25HP045AN, manufactured by Advantec Co., Ltd.). The resulting filtrate is 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) is converted to the concentration of component (C) from a calibration curve created by diluting component (C) in advance, and the amount of adsorption (aA) of component (C) relative to component (A) is calculated from the concentration of the non-adsorbed portion of component (C) relative to component (A).

[0032] 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, from the viewpoint of fluidity of the hydraulic composition slurry, the component (C) is preferably at least one selected from urea, thiourea, biuret and guanylthiourea, and more preferably at least one selected from urea and thiourea.

[0033] <(D) component> Component (D) is a polycarboxylic acid-based dispersant. As the polycarboxylic acid-based 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. The polycarboxylic acid dispersant is more preferably a copolymer containing, as constituent monomers, a monomer (1d) represented by the following general formula (1d) and a monomer (2d) represented by the following general formula (2d).

[0034] [ka]

[0035] [During the ceremony, R 1d , R 2d may be the same or different, and may be a hydrogen atom or a methyl group. R 3d : Hydrogen atom or -(CH2) q (CO) p O(AO) n1 -R 4d R 4d : 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, a number between 1 and 300 q: a number between 0 and 2 p: 0 or 1 Indicates the following.

[0036] [ka]

[0037] [During the ceremony, R 5d , R 6d , R 7d may be the same or different, and may be a hydrogen atom, a methyl group or (CH2) r COOM 2 and (CH2) r COOM 2 COOM 1 or other (CH2) r COOM 2 and an anhydride may be formed, in which case, M 1 , M 2 does not exist. M 1 , M 2may be the same or different, and are a hydrogen atom, an alkali metal, an alkaline earth metal (1 / 2 atom), an ammonium group, an alkylammonium group, a substituted alkylammonium group, an alkyl group, a hydroalkyl group, or an alkenyl group. r: A number between 0 and 2 Indicates the following.

[0038] In general formula (1d), R 1d is preferably a hydrogen atom from the viewpoint of fluidity of the hydraulic composition slurry. In general formula (1d), R 2d From the viewpoint of fluidity of the hydraulic composition slurry, a methyl group is preferred. In general formula (1d), R 3d is preferably a hydrogen atom from the viewpoint of fluidity of the hydraulic composition slurry. In general formula (1d), R 4d In view of the fluidity of the hydraulic composition slurry, R is preferably a hydrogen atom or a methyl group, and more preferably a methyl group. 4d If it contains, R 4d may be the same or different. In the 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 AO are contained in the general formula (1d), the AO 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, 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 general formula (1d) contains a plurality of n1, n1 may be the same or different. In the general formula (1d), from the viewpoint of fluidity of the hydraulic composition slurry, q is preferably 0. When the general formula (1d) contains a plurality of q's, the q's 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.

[0039] In producing the monomer (1d), sulfonic acid may be used as an acid catalyst. For example, such a method is described in JP 2008-214638 A. 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 it is, as long as it does not impair the effects of the present invention.

[0040] In the general formula (2d), from the viewpoint of fluidity of the hydraulic composition slurry, R 5d is preferably a hydrogen atom. In the general formula (2d), from the viewpoint of fluidity of the hydraulic composition slurry, R 6d is preferably a methyl group. In the general formula (2d), from the viewpoint of fluidity of the hydraulic composition slurry, R 7d is preferably a hydrogen atom. M 1 , M 2 The alkyl group, the hydroalkyl group, and the alkenyl group each preferably have 1 to 4 carbon atoms. M 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, even more preferably a hydrogen atom, an alkali metal, or an alkaline earth metal (1 / 2 atom), and even more preferably a hydrogen atom or an alkali metal. From the viewpoint of fluidity of the hydraulic composition slurry, (CH2) in the general formula (2d) r COOM 2 In the above formula, r is preferably 1.

[0041] In the copolymer containing the monomer (1d) as a constituent monomer, the total amount of the monomer (1d) in the constituent monomers is preferably 90 mass% or more, more preferably 92 mass% or more, even more preferably 95 mass% or more, and preferably 100 mass% or less, from the viewpoint of the fluidity of the hydraulic composition slurry. This total amount may be 100 mass%. In the copolymer containing the monomer (1d) and the monomer (2d) as constituent monomers, the total amount of the monomer (1d) and the monomer (2d) in the constituent monomers is preferably 90 mass% or more, more preferably 92 mass% or more, further preferably 95 mass% or more, and preferably 100 mass% or less, from the viewpoint of the fluidity of the hydraulic composition slurry. This total amount may be 100 mass%.

[0042] 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.

[0043] 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.

[0044] The weight average molecular weights of the polycarboxylic acid dispersant, the copolymer further containing monomer (1d) as a constituent monomer, and the copolymer further containing monomer (1d) and monomer (2d) as constituent monomers were each measured by gel permeation chromatography (GPC) under the following conditions. *GPC conditions Equipment: GPC (HLC-8320GPC) manufactured by Tosoh Corporation Column: G4000PWXL+G2500PWXL (Tosoh Corporation) Eluent: 0.2M phosphate buffer / CH3CN=9 / 1 Flow rate: 1.0mL / min Column temperature: 40℃ Detection: RI Sample size: 0.2mg / mL Standard substance: Polyethylene glycol equivalent (monodisperse polyethylene glycol with known molecular weight, molecular weight 250,000, 145,000, 87,500, 46,000, 24,000)

[0045] As the polycarboxylic acid-based dispersant, two or more dispersants differing in the average number of moles of AO added or the ratio of the monomer (1a) and the monomer (2a) may be used.

[0046] <Composition, etc.> The hydraulic composition of the present invention contains the (A) component 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 even more preferably 70 parts by mass or more, based on 100 parts by mass of the total of the (A) component and the (B) component in the hydraulic composition, from the viewpoint of the strength expression 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.

[0047] In the hydraulic composition of the present invention, the content of the (A) component 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 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.

[0048] The hydraulic composition of the present invention contains the (B) component 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, based on 100 parts by mass of the total of the (A) and (B) components 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 expression of the hydraulic composition.

[0049] In the hydraulic composition of the present invention, the content of the (B) component is preferably 1 mass % or more, more preferably 5 mass % or more, and even more preferably 10 mass % or more from the viewpoint of reducing the environmental load, and is preferably 60 mass % or less, more preferably 50 mass % or less, and even more preferably 40 mass % or less from the viewpoint of the strength expression of the hydraulic composition.

[0050] The hydraulic composition of the present invention contains the (C) component 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, based on 100 parts by mass of the total of the (A) and (B) components 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, based on the viewpoint of strength development of the hydraulic composition.

[0051] In the hydraulic composition of the present invention, the content of the (C) component is preferably 0.001 mass % or more, more preferably 0.002 mass % or more, and even more preferably 0.004 mass % or more from the viewpoint of the fluidity of the hydraulic composition slurry, and is preferably 0.5 mass % or less, more preferably 0.4 mass % or less, and even more preferably 0.3 mass % or less from the viewpoint of the strength development of the hydraulic composition.

[0052] The hydraulic composition of the present invention contains the (D) component 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, based on 100 parts by mass of the total of the (A) and (B) components in the hydraulic composition, from the viewpoint of the 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, based on the viewpoint of the strength development of the hydraulic composition.

[0053] In the hydraulic composition of the present invention, the content of the (D) component is preferably 0.01 mass% or more, more preferably 0.1 mass% or more, and even more preferably 0.2 mass% or more from the viewpoint of the fluidity of the hydraulic composition slurry, and is preferably 5 mass% or less, more preferably 2.5 mass% or less, even more preferably 1 mass% or less, and even more preferably 0.5 mass% or less from the viewpoint of the strength development of the hydraulic composition.

[0054] In the hydraulic composition of the present invention, the mass ratio of the content of the (C) component to the content of the (D) component ((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.

[0055] <(E) component> The hydraulic composition of the present invention may further contain water (E) (hereinafter referred to as component (E)). Examples of water (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 ground product containing the components (A), (B) and (C), the component (D) and the component (E).

[0056] 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, based on 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, still 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, based on the viewpoint of strength development of the hydraulic composition.

[0057] When the hydraulic composition of the present invention contains the component (E), the content of the component (E) in the hydraulic composition of the present invention is preferably 10 mass% or more, more preferably 15 mass% or more, and even more preferably 20 mass% or more from the viewpoint of the fluidity of the hydraulic composition slurry, and is preferably 60 mass% or less, more preferably 50 mass% or less, and even more preferably 45 mass% or less from the viewpoint of the strength development of the hydraulic composition.

[0058] 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 mass% or more, more preferably 20 mass% or more, and even more preferably 30 mass% or more from the viewpoint of fluidity of the hydraulic composition slurry, and is preferably 60 mass% or less, more preferably 55 mass% or less, and even more preferably 50 mass% or less from the viewpoint of strength expression of the hydraulic composition. Here, the water / hydraulic powder ratio (W / C) is the mass percentage (mass%) of water and hydraulic powder in the hydraulic composition, and is calculated by (water / hydraulic powder)×100. In addition, when the hydraulic powder includes a powder selected from a powder having a pozzolanic action, a powder having latent hydraulic properties, and a stone powder (calcium carbonate powder) in addition to a powder having a property of hardening by a hydration reaction such as cement, the amount of these powders is also included in the amount of the hydraulic powder in the present invention. In addition, when the powder having a property of hardening by a hydration reaction contains a high-strength admixture, the amount of the high-strength admixture is also included in the amount of the hydraulic powder. This is also true for other parts by mass in which the mass of the hydraulic powder is related. The hydraulic powder may be a powder containing the (A) component and the (B) component, or may be a powder consisting of the (A) component and the (B) component.

[0059] <Aggregate> The hydraulic composition of the present invention may contain an aggregate as desired. The aggregate may be selected from fine aggregate and coarse aggregate. The fine aggregate may be one specified by number 2311 in JISA 0203-2014. For example, the fine aggregate may be river sand, land sand, mountain sand, sea sand, lime sand, silica sand, and crushed sand thereof, blast furnace slag fine aggregate, ferronickel slag fine aggregate, lightweight fine aggregate (artificial and natural), and recycled fine aggregate. The coarse aggregate may be one specified by number 2312 in JISA 0203-2014. For example, the coarse aggregate may be river gravel, land gravel, mountain gravel, sea gravel, lime gravel, crushed stone thereof, blast furnace slag coarse aggregate, ferronickel slag coarse aggregate, lightweight coarse aggregate (artificial and natural), and recycled coarse aggregate. The fine aggregate and the coarse aggregate may be used in a mixture of different types, or a single type may be used.

[0060] 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, and preferably 100% or less, more preferably 90% or less, even more preferably 80% or less, in terms of bulk volume, from the viewpoint of strength development of the hydraulic composition. 3 It is the ratio of the volume of coarse aggregate (including voids) in the concrete. In addition, when the hydraulic composition is concrete, that is, when the hydraulic composition contains the components (A) to (E), coarse aggregate and fine aggregate, the amount of fine aggregate used is preferably 500 kg / m from the viewpoint of 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 Less than or equal to 900 kg / m 3 The following is the result. When the hydraulic composition is a mortar, i.e., when the hydraulic composition contains the components (A) to (E) and fine aggregate, the amount of fine aggregate used is preferably 800 kg / m 3 More preferably, 900kg / m 3 More preferably, 1,000 kg / m 3 and preferably 2,000 kg / m 3 Less than or equal to 1,800 kg / m 3 or less, more preferably 1,700 kg / m 3 The following is the result.

[0061] <Antifoaming agent> The hydraulic composition of the present invention may further contain an optional defoaming agent. As the defoaming agent, a silicone-based defoaming agent, a fatty acid ester-based defoaming agent, and an ether-based defoaming agent are preferred, of which dimethylpolysiloxane is more preferred among the silicone-based defoaming agents, polyalkylene glycol fatty acid ester is more preferred among the fatty acid ester-based defoaming agents, and polyalkylene glycol ether is more preferred among the ether-based defoaming agents.

[0062] The hydraulic composition of the present invention contains an antifoaming agent in an amount of preferably 0.00005 parts by mass or more, more preferably 0.0001 parts by mass or more, and even more preferably 0.0005 parts by mass or more, based on 100 parts by mass of the total of the (A) and (B) components in the hydraulic composition, from the viewpoint of the strength development of the hydraulic composition, and preferably 0.025 parts by mass or less, more preferably 0.005 parts by mass or less, and even more preferably 0.001 parts by mass or less, based on the viewpoint of the fluidity of the hydraulic composition slurry.

[0063] The content of the defoaming 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.

[0064] The hydraulic composition of the present invention may contain, as optional components, preservatives, hydraulic composition early strength components, hardening accelerators, hardening retarders, AE agents, waterproofing agents, shrinkage reducing agents, rust inhibitors, crack reducing agents, pH adjusters, and other surfactants.

[0065] The hardened body 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, and 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 centrifugal-molded products such as poles, piles, and Hume pipes.

[0066] 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 be a hydraulic composition comprising the following components (A), (B), (C), (D) and (E). The hydraulic composition of the present invention may be a hydraulic composition further comprising the above-mentioned optional components.

[0067] 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. Also, in the hydraulic composition of the present invention, the mass ratio of the contents of each component can be applied by replacing the mass ratio of the blending amounts of each component.

[0068] <Method for producing hydraulic composition> In an exemplary embodiment, the present invention provides a method for producing a hydraulic composition, comprising mixing the above-mentioned components (A), (B), (C), (D) a polycarboxylic acid-based dispersant, and (E) water. The method for producing a hydraulic composition of the present invention may be a method for producing a hydraulic composition, which comprises mixing a mixed ground product obtained by grinding a mixture containing the (A) component and the (B) component in the presence of the (C) component, the (D) component, and the (E) water.

[0069] The embodiment described for the hydraulic composition of the present invention can be applied to the method for producing the hydraulic composition of the present invention. In the method for producing the hydraulic composition of the present invention, the components (A) to (E), optional components, preferred embodiments, etc. 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 mixing amounts of the components (A) to (E) and the mass ratios of the mixing amounts (for example, the mass ratio (C) / (D) etc.) can be applied by replacing the contents of each component described in the hydraulic composition of the present invention with the mixing amounts.

[0070] In the method for producing a hydraulic composition of the present invention, for example, a mixture containing components (A) and (B) is pulverized in the presence of component (C). Pulverizing a mixture containing components (A) and (B) in the presence of component (C) means pulverizing the mixture in a state in which component (C) is contained in the mixture. Therefore, 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 the (A) component, the (B) component, and the (C) component, and then grinding the resulting mixture to obtain a ground mixture, and mixing the ground mixture with the (D) component and the (E) component. In addition, the method for producing a hydraulic composition of the present invention may be a method for producing a hydraulic composition comprising adding the (C) component to a mixture of the (A) component and the (B) component, pulverizing the mixture to which the (C) component has been added, and mixing the pulverized mixture obtained by pulverizing the mixture with the (D) component and the (E) component.

[0071] For example, in the method for producing the hydraulic composition of the present invention, the method for adding component (C) to the mixture of components (A) and (B) includes a method in which a liquid mixture containing component (C) is supplied, preferably in the form of a solution, by dropping, 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 the dissolved component (C) to the mixture of components (A) and (B). When adding component (C) to a mixture of components (A) and (B), or adding component (C) and other components, the total amount to be finally used may be added all at once or in portions, or may be added by supplying continuously or intermittently. Specifically, component (C) may be added by spraying or supporting it on component (A) or component (B), and mixing or grinding may be started after components (A), (B), and (C) have all been added; alternatively, component (A) or component (B) and component (C) may be mixed or ground for a certain period of time, and then the remaining component (B) or component (A) may be added and mixed or ground again. More specifically, the method for producing a hydraulic composition of the present invention may be a method for producing a hydraulic composition, which comprises mixing a mixture of the (A) component and the (C) component with the (B) component, or mixing a mixture of the (B) component and the (C) component with the (A) component, pulverizing the mixture, which is obtained by mixing the mixture, and mixing the (B) component with the (C) component with the (A) component, and mixing the pulverized mixture with the (D) component and the (E) component.

[0072] In the method for producing the hydraulic composition of the present invention, the conditions for grinding the mixture containing components (A), (B) and (C) may be adjusted so as to obtain a powder with an appropriate particle size depending on the raw materials, applications, etc. Generally, the specific surface area and Blaine value are 2,500 cm 2 / g or more 5,000cm 2 / g or less, and 3,000cm 2 / g or more 4,000cm 2 It is preferable to grind the mixture, e.g., clinker, until the mixture is a powder with a density of 1 / g or less. The desired Blaine value can be obtained, for example, by adjusting the grinding time. The longer the grinding time, the higher the Blaine value tends to be, and the shorter the grinding time, the lower the Blaine value tends to be.

[0073] In the method for producing a hydraulic composition of the present invention, the grinding device used for grinding the mixture containing the components (A) and (B) is not particularly limited, but examples thereof include ball mills and Roche mills that are commonly used for grinding cement, etc. The material of the grinding medium (grinding balls) of the device is desirably 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 generally available commercially available products include steel, stainless steel, alumina, zirconia, titania, tungsten carbide, etc.

[0074] 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 further the mixing device used for mixing the mixed pulverized product containing the components (A), (B) and (C) with 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 widely used for mixing cement and the like.

[0075] 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 and mixed with the mixed and ground product of the components (A) and (B) to which the component (C) has been added, or the component (E) may be mixed and then the component (D) may be added and further mixed. Also, when the component (D) is in powder form, the mixed and ground product 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. EXAMPLES

[0076] <Materials used> <Component (A)> Ordinary Portland cement (average particle size 21.8 μm, manufactured by Taiheiyo Cement Corporation)

[0077] <(B) component> 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.)

[0078] <(C) component> C-1: 40% urea aqueous solution, urea (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.) dissolved in ion-exchanged water to a concentration of 40% C-2: 10% urea ethylene glycol solution, urea (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.) dissolved in ethylene glycol (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.) to a concentration of 10%. C-3: 10% urea diethylene glycol solution, urea (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.) dissolved in diethylene glycol (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.) to a concentration of 10%. C-4: Urea (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.) C-5: Thiourea (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.) C-6: Biuret (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.) C-7: 2-Imidazolidinone (Tokyo Chemical Industry Co., Ltd.) C-8: Guanylthiourea (Tokyo Chemical Industry Co., Ltd.) C-9: 1,1,3,3-tetramethylguanidine (Tokyo Chemical Industry Co., Ltd.) When component (C) is used in the form of a solution, the amount of component (C) (e.g., urea) in the table is the amount of active ingredient.

[0079] <(D) component> Methacrylic acid / methoxypolyethylene glycol (25) methacrylate = 75 / 25 mol% copolymer sodium salt, weight average molecular weight 40,000 <(E) component> Tap water (Wakayama City, Wakayama Prefecture)

[0080] The iron content and Mohs hardness of component (B) shown in Table 1 were measured by the following method.

[0081] <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 CuKα target, 40mA tube current, 200kV tube voltage, 5-70deg, 2θ scanning range, step scanning, 0.02° step width, and 2 seconds counting time. 10 parts by mass of α-corundum (Al2O3) was added to component (B) as a standard substance, and the iron content was calculated in terms of iron oxide (Fe2O3) using Rietveld analysis software based on the peak area of ​​the standard substance. PDXL Ver.1.8 manufactured by Rigaku Corporation was used as the Rietveld analysis software.

[0082] <Method for measuring Mohs hardness of component (B)> The Mohs hardness of the (B) component was measured using a Mohs hardness tester (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.

[0083] <Calculation method of (aB) / (aA) for component (C)> First, 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 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 amount of adsorption (aA) or amount of adsorption (aB) of component (C) relative to component (A) or component (B) was calculated from the concentration of the non-adsorbed portion of component (C) relative to component (A) or component (B) detected in the diluted filtrate using an online total organic carbon meter (TOC-V, manufactured by Shimadzu Corporation). The mass ratio (aB) / (aA) of the amount of adsorption of the component (C) in component (B) to the amount of adsorption of the component (C) in component (A) was calculated based on the amount of adsorption of the component (C) in component (A) (aA) and the amount of adsorption of the component (C) in component (B) (aB).

[0084] <Example 1 and Comparative Example 1> (1) Grinding and mixing of hydraulic powder The above components (A), (B), and (C) were placed in a mixer (MX-X301, manufactured by Panasonic Corporation) in the amounts shown in Table 1, and after stirring for 2 minutes, the mixture was cooled to 20°C to obtain a ground mixture containing components (A) and (B). Component (C) was added to component (B) by spraying, and mixing or grinding was started after component (A) was added.

[0085] (2) Manufacturing method of hydraulic composition slurry Using the hydraulic powder prepared by the method of (1), a mortar was prepared according to the following mortar composition: That is, the pulverized mixture prepared in (1) was mixed so that the total amount of the (A) component and the (B) component was 400 g to prepare a hydraulic composition with the following mortar composition. All materials were adjusted to 20°C, and the fine aggregate was adjusted to a surface-dried state, and the tests were carried out at 20°C. Mortar was prepared by adding the compounding ingredients in the parts by mass shown in Table 1 using a mortar mixer specified in JIS R 5201, and kneading (60 rpm, 120 seconds). At that time, the hydraulic powder prepared by method (1) was dry-mixed with the fine aggregate beforehand and added. Component (D), Component (E), and the defoaming agent were mixed beforehand and added.

[0086] <Mortar Mixture> The ground mixture obtained in (1): 400 g ·Fine aggregate: 700g (sand, from Joyo, Kyoto Prefecture, surface dry specific gravity 2.50g / cm 3 ) Tap water: 140g or 200g Defoamer: 0.05g (Antifoamer No. 21, Kao Corporation)

[0087] (3) Evaluation of fluidity of hydraulic composition slurry The mortar immediately after mixing prepared by method (2) was filled into a flow cone (upper diameter 70 mm × lower diameter 100 mm × height 60 mm) specified in JIS R 5201, and the mortar flow was measured. The results are shown in Table 1. A hydraulic composition having a large mortar flow is a hydraulic composition having improved fluidity.

[0088] [Table 1]

[0089] In Table 1, Examples 1-1 to 1-10 had improved mortar flow (mortar fluidity) compared to Comparative Example 1-1. This is believed to be because the combination of component (C) and component (D), which has excellent surface tension reducing ability of water, promotes wetting of the surfaces of components (A) and (B) with water and reduces the electrostatic force that is the starting point of aggregation, thereby reducing the 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: (A) Component: Cement clinker or cement powder (B) Component: 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) 【Chemistry 1】 [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. 2. The hydraulic composition according to claim 1, 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 1.5 or more.

3. 3. The hydraulic composition according to claim 1, wherein the component (C) is at least one selected from the group consisting of urea and its derivatives.

4. 3. The hydraulic composition according to claim 1, comprising a mixed ground product containing the components (A), (B) and (C), a polycarboxylic acid dispersant (D), and water (E).

5. A hydraulic composition comprising the following components (A), (B), (C) and (D) a polycarboxylic acid dispersant: (A) Component: Cement clinker or cement powder (B) Component: 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) 【Chemistry 2】 [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)): (A) Component: Cement clinker or cement powder (B) Component: 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) 【Chemistry 3】 [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. 7. The method for producing a hydraulic composition according to claim 6, further comprising the steps of: mixing a mixture of the components (A) and (C) with the component (B); or mixing a mixture of the components (B) and (C) with the component (A), and grinding the mixture; and mixing the mixture with the component (D) and the component (E).

8. The method for producing a hydraulic composition according to claim 6 or 7, wherein the component (C) is at least one selected from the group consisting of urea and its derivatives.

9. The method for producing a hydraulic composition according to claim 6 or 7, wherein the component (C) is mixed in an amount of 0.001 part by mass or more and 0.5 part by mass or less per 100 parts by mass of the total of the components (A) and (B).

10. The method for producing a hydraulic composition according to claim 6 or 7, wherein the component (D) 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 total of the components (A) and (B).

11. The method for producing a hydraulic composition according to claim 6 or 7, wherein the 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 the components (A) and (B).

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