Classifications

• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
  • C04B24/24—Macromolecular compounds
  • C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
  • C04B24/2641—Polyacrylates; Polymethacrylates
  • C04B24/2647—Polyacrylates; Polymethacrylates containing polyether side chains
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
  • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
  • C04B40/0028—Aspects relating to the mixing step of the mortar preparation
  • C04B40/0039—Premixtures of ingredients
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
  • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
  • C08F220/04—Acids; Metal salts or ammonium salts thereof
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
  • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
  • C08F220/10—Esters
  • C08F220/34—Esters containing nitrogen, e.g. N,N-dimethylaminoethyl (meth)acrylate
  • C08F220/36—Esters containing nitrogen, e.g. N,N-dimethylaminoethyl (meth)acrylate containing oxygen in addition to the carboxy oxygen, e.g. 2-N-morpholinoethyl (meth)acrylate or 2-isocyanatoethyl (meth)acrylate
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F290/00—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups
  • C08F290/02—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups on to polymers modified by introduction of unsaturated end groups
  • C08F290/06—Polymers provided for in subclass C08G
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
  • C04B2103/40—Surface-active agents, dispersants
  • C04B2103/408—Dispersants

Definitions

• the present invention relates to a dispersant composition for a hydraulic composition for centrifugal molding or vibration molding and a method for producing the same, a hydraulic composition for centrifugal molding or vibration molding and a method for producing the same, and a method for producing a cured product of the hydraulic composition.
• Centrifugal molding is known as a method for producing hollow cylindrical concrete molded products such as pipes, piles and poles.
• This centrifugal molding method is a method in which a kneaded concrete material is put into a mold and the concrete is pressed against the inner surface of the mold by centrifugal force generated by rotating the mold at a high speed.
• the formwork has joints parallel to the rotation axis, and during the centrifugal compaction process of concrete, large vibrations are applied to the concrete due to the joints of the formframes splashing the formwork during centrifugal molding. It is one of the factors that contribute to firmness.
• naphthalene-based dispersants are often used as the dispersant from the viewpoint of moldability of centrifugally molded products, but there is a growing need for higher strength and earthquake resistance both in Japan and overseas.
• a region where a high-strength hardened body is required in a region where the unit water amount of concrete is small, a region where it is difficult to knead with a naphthalene-based dispersant appears, which makes practical use difficult.
• Centrifugal compaction is a property that indicates the degree of compaction of concrete during centrifugal molding. It depends on the filling property of mortar in the aggregate gap during centrifugal molding and the shape retention (property to maintain the shape) after molding. It is considered to be dominated. Therefore, it is considered that the centrifugal compaction property of the concrete during centrifugal molding reflects the thixotropic property of the concrete as a fluid.
• centrifugal compaction property of the centrifugally molded product is not good, the strength development of the cured product after centrifugal molding will be reduced, the centrifugal compaction process will take time, and the productivity will be impaired. Defects such as exfoliation of hardened concrete (shelf drop) will occur. Therefore, a hydraulic composition for centrifugal molding is desired to exhibit more excellent centrifugal compaction property.
• Japanese Patent Application Laid-Open No. 61-122147 discloses a concrete containing amorphous ultrafine silica, a high-performance raw water additive and a centrifugal molding aid, and having a water cement ratio of 35% or less, and a centrifugal force of 35 G or less at a medium speed. There is disclosed a method for producing concrete, which is characterized by compacting with.
• the structural unit (II) derived from (b) and the structural unit (III) derived from the unsaturated monocarboxylic acid-based monomer (c) are included as essential structural units, and the structural unit (I) and the structural unit ( II) and the structural unit (III) each account for 1% by weight or more of all the structural units, and the total ratio of the structural unit (I) and the structural unit (II) is 50 mol% or less in the total structural unit.
• the cement admixture containing the copolymer (A) as an essential component is described.
• Japanese Unexamined Patent Publication No. 2002-348161 discloses a constitutional unit (I) derived from a specific unsaturated polyalkylene glycol ether monomer (a1) and a specific unsaturated monocarboxylic acid type monomer (b) derived from the structural unit (I).
• a cement dispersant containing a copolymer containing a structural unit (II) as an essential component, wherein the structural unit (II) includes at least a structure derived from methacrylic acid (salt). has been done.
• JP-A-58-74552 discloses a specific polyalkylene glycol mono (meth) acrylic acid ester-based monomer, a specific (meth) acrylic acid-based monomer, and any monomer polymerizable with these.
• a cement dispersant containing, as a main component, a copolymer or a neutralized product thereof derived from the above is described.
• the present invention provides a dispersant composition for a hydraulic composition capable of imparting excellent vibration moldability to a hydraulic composition that is molded using an external force such as centrifugal molding or vibration molding.
• the present invention includes, as constituent monomers, acrylic acid or a salt thereof, methacrylic acid or a salt thereof, and a compound represented by the following general formula (1), and a total of acrylic acid or a salt thereof and methacrylic acid or a salt thereof.
• a hydraulic composition for centrifugal molding or vibration molding which contains a copolymer having a proportion of acrylic acid or a salt thereof of 20 mol% or more and 70 mol% or less and a weight average molecular weight of 30,000 or more and 100,000 or less. Dispersant composition.
• R 1 and R 3 are the same or different and each represents an alkyl group having 1 to 3 carbon atoms, R 2 represents a hydrogen atom or a methyl group, and n is an average number of moles added and is 5 to 150. Indicates the number.
• the present invention also contains the dispersant composition for a hydraulic composition for centrifugal molding or vibration molding of the present invention, water, and a hydraulic powder, and the water / hydraulic powder ratio is 10% by mass or more. 25% by mass or less of the hydraulic composition for centrifugal molding or vibration molding.
• the present invention also relates to a method for improving the compaction property of a hydraulic composition by centrifugal force, using the dispersant composition for a hydraulic composition for centrifugal molding or vibration molding of the present invention.
• the present invention also relates to a method for producing a hydraulic composition, which comprises mixing the dispersant composition for a hydraulic composition for centrifugal molding or vibration molding of the present invention, water, and a hydraulic powder.
• the present invention is to produce a hydraulic composition by mixing the dispersant composition for a hydraulic composition for centrifugal molding or vibration molding of the present invention, water, and a hydraulic powder, and the hydraulic composition
• the present invention relates to a method for producing a cured product of a hydraulic composition, in which a mold is filled with an object and then the mold is clamped by applying a centrifugal force.
• the present invention is to produce a hydraulic composition by mixing the dispersant composition for a hydraulic composition for centrifugal molding or vibration molding of the present invention, water, and a hydraulic powder, and the hydraulic composition
• the present invention relates to a method for producing a cured product of a hydraulic composition, in which a mold is filled with a product and then the mold is clamped with vibration.
• the dispersant composition for hydraulic composition for centrifugal molding or vibration molding of the present invention may be referred to as the dispersant composition for hydraulic composition of the present invention or the dispersant composition of the present invention. Further, the hydraulic composition for centrifugal molding or vibration molding of the present invention may be referred to as the hydraulic composition of the present invention.
• a dispersant composition for a hydraulic composition which can impart excellent vibration moldability to a hydraulic composition used for molding using vibration such as centrifugal molding and vibration molding.
• the absolute coating area of the surface of the hydraulic particles is reduced, the hydration reaction is promoted (a delay in setting is avoided), and a dense structure is formed by the hydration product, which results in a hydraulic composition. It is considered that the thixotropy of the product is improved and the excellent vibration response is brought about. In addition, since the vibration is generated by the rotation of the metallic mold during centrifugal molding, it is considered that during centrifugal molding, when fluidized, it fluidizes and the filling of the aggregate progresses, resulting in excellent centrifugal compaction.
• the component (A) is a copolymer having a predetermined weight average molecular weight containing acrylic acid or a salt thereof, methacrylic acid or a salt thereof, and a compound represented by the following general formula (1) as constituent monomers.
• the component (A) has a proportion of acrylic acid or a salt thereof of 20 mol% or more and 70 mol% or less in the total of acrylic acid or a salt thereof and methacrylic acid or a salt thereof.
• the component (A) has a proportion of acrylic acid or a salt thereof of 20 mol% or more, preferably 30 mol% or more in the total of acrylic acid or a salt thereof and methacrylic acid or a salt thereof, from the viewpoint of vibration response and centrifugal compaction property. , More preferably 40 mol% or more, and 70 mol% or less, preferably 65 mol% or less, more preferably 60 mol% or less.
• the component (A) is acrylic acid or its salt in the total of acrylic acid or its salt, methacrylic acid or its salt, and the compound represented by the above general formula (1).
• the total proportion of the salt and methacrylic acid or its salt is preferably 50 mol% or more, more preferably 60 mol% or more, further preferably 65 mol% or more, and preferably 95 mol% or less, more preferably 85 mol% or less, further preferably Is 77 mol% or less.
• the total proportion of acrylic acid or a salt thereof, methacrylic acid or a salt thereof, and the compound represented by the general formula (1) in the total amount of the constituent monomers is preferably 50 mol% or more, It is more preferably 70 mol% or more, and preferably 100 mol% or less, and may be 100 mol%.
• Examples of the salt of acrylic acid and the salt of methacrylic acid include an alkali metal salt, an alkaline earth metal salt (1/2 atom), an ammonium salt, an alkylammonium salt, or an alkenylammonium salt, and preferably an alkali metal salt.
• R 1 is preferably a methyl group.
• R 2 is preferably a hydrogen atom.
• R 3 is preferably a methyl group or a hydrogen atom.
• n is the average number of moles added, preferably 10 or more, more preferably 20 or more, further preferably 30 or more, still more preferably 40 or more, and preferably 90 or less, more preferably Is 80 or less, more preferably 70 or less, even more preferably 60 or less, still more preferably 55 or less.
• the component (A) has a weight average molecular weight of 30,000 or more, preferably 32,000 or more, more preferably 35,000 or more, from the viewpoint of imparting excellent vibration moldability to the hydraulic composition. It is 100,000 or less, preferably 60,000 or less, more preferably 50,000 or less, still more preferably 45,000 or less, still more preferably 40,000 or less. This weight average molecular weight is measured by gel permeation chromatography (GPC) under the following conditions.
• the dispersant composition for hydraulic composition of the present invention may further contain a strength improver and / or a retarder.
• the strength improver examples include a polyol compound, an alkali metal thiosulfate, an alkaline earth metal thiosulfate, an alkaline metal thiocyanate, an alkaline earth metal thiocyanate, an alkaline metal sulfate and an alkaline earth metal sulfate.
• the strength improver is preferably one or more selected from polyol compounds.
• the polyol compound include glycerin, glycerin ester derivatives, glycol compounds, and sugar alcohols.
• the polyol compound is preferably glycerin.
• the retarder examples include oxycarboxylic acid, polyvalent carboxylic acid, reducing polysaccharide and sugar alcohol.
• the retarder is preferably one or more selected from oxycarboxylic acids.
• the oxycarboxylic acid is gluconic acid and / or its salt, glycolic acid and / or its salt, tartronic acid and / or its salt, glyceric acid and / or its salt, tartaric acid and / or its salt, citric acid and / or its Salt, salicylic acid and / or its salt, gallic acid and / or its salt are mentioned.
• the oxycarboxylic acid is preferably gluconic acid and / or a salt thereof.
• the dispersant composition for hydraulic compositions of the present invention preferably contains component (A) in an amount of 10% by mass or more, more preferably 15% by mass or more, still more preferably 20% by mass or more, and preferably 90% by mass.
• the following content is more preferably 70% by mass or less, further preferably 50% by mass or less.
• the dispersant composition for hydraulic compositions of the present invention may have a content of the component (A) of 100% by mass, that is, a component (A).
• the dispersant composition for a hydraulic composition of the present invention contains a strength improver
• its content is preferably 0.01% by mass or more, more preferably 0.1% by mass or more, and , Preferably 10% by mass or less, more preferably 5% by mass or less.
• the mass ratio of the content of the component (A) to the content of the strength improver is the content of the strength improver / (
• the content of component A) is preferably 0.01 or more, more preferably 0.03 or more, still more preferably 0.045 or more, and preferably 1 or less, more preferably 0.5 or less, still more preferably 0. 0.2 or less, more preferably 0.1 or less, still more preferably 0.07 or less.
• the content thereof is preferably 0.01% by mass or more, more preferably 0.1% by mass or more, and It is preferably 10% by mass or less, more preferably 5% by mass or less.
• the mass ratio of the content of the component (A) and the content of the retarder is the content of the retarder / the component of (A).
• Content is preferably 0.01 or more, more preferably 0.02 or more, and preferably 1 or less, more preferably 0.5 or less, still more preferably 0.2 or less, still more preferably 0.1 or less. Or less, more preferably 0.07 or less, still more preferably 0.05 or less.
• the dispersant composition for hydraulic compositions of the present invention may further contain a polycarboxylic acid dispersant (hereinafter referred to as other polycarboxylic acid dispersant) composed of a copolymer other than the component (A). it can.
• a polycarboxylic acid dispersant hereinafter referred to as other polycarboxylic acid dispersant
• Other polycarboxylic acid-based dispersants include copolymers of methacrylic acid or a salt thereof and a compound represented by the general formula (1), which have a known structure and composition as a dispersant. Can be mentioned.
• the mass ratio of other polycarboxylic acid type dispersant / (A) component is preferably 0.01.
• the mass ratio of the total content of the strength improver and the retarder and the total content of the component (A) and the other polycarboxylic acid-based dispersant is ( (Total content of strength improver and retarder) / (total content of (A) component and other polycarboxylic acid-based dispersant), preferably 0.02 or more, more preferably 0.05 or more, and It is preferably 2 or less, more preferably 1 or less, still more preferably 0.5 or less, even more preferably 0.3 or less, even more preferably 0.2 or less, still more preferably 0.1 or less.
• This mass ratio includes the case where the content of one of the strength improver and the retarder is 0.
• the dispersant composition for hydraulic compositions of the present invention contains, as other optional components, an AE agent, a foaming agent, a thickener, a foaming agent, a waterproofing agent, a fluidizing agent, a defoaming agent, and the like. You can
• the dispersant composition for hydraulic composition of the present invention may contain water.
• the dispersant composition for hydraulic composition of the present invention may be a liquid composition.
• the dispersant composition for hydraulic composition of the present invention may be a dispersant composition for hydraulic composition for centrifugal molding.
• the dispersant composition for hydraulic composition of the present invention may be a dispersant composition for hydraulic composition for vibration molding.
• the dispersant composition for a hydraulic composition for centrifugal molding is one of the preferred embodiments of the dispersant composition for a hydraulic composition of the present invention.
• the present invention provides the use of the dispersant composition for hydraulic compositions of the present invention as a dispersant for hydraulic compositions for centrifugal molding or vibration molding.
• the present invention also provides use of the copolymer of component (A) as a dispersant for a hydraulic composition for centrifugal molding or vibration molding.
• the present invention also provides the use of the copolymer of component (A) for producing a dispersant for a hydraulic composition for centrifugal molding or vibration molding.
• the matters described in the dispersant composition for a hydraulic composition of the present invention can be appropriately applied to these uses.
• the present invention provides a hydraulic composition for centrifugal molding or vibration molding containing the dispersant composition for hydraulic composition of the present invention, water, and hydraulic powder.
• the hydraulic composition of the present invention is a copolymer [(A) component] containing acrylic acid or a salt thereof, methacrylic acid or a salt thereof, and a compound represented by the following general formula (1) as constituent monomers.
• a hydraulic composition for centrifugal molding or vibration molding containing a hydraulic powder wherein the copolymer is acrylic acid or a salt thereof and methacrylic acid or a salt thereof in total, acrylic acid or A hydraulic composition for centrifugal molding or vibration molding in which the proportion of the salt is 20 mol% or more and 70 mol% or less.
• the matters described in the dispersant composition for a hydraulic composition of the present invention can be appropriately applied to the hydraulic composition of the present invention.
• the specific examples and preferred embodiments of the component (A) are the same as those of the dispersant composition for a hydraulic composition of the present invention.
• the hydraulic composition of the present invention preferably contains the component (A) in an amount of 0.01 parts by mass or more, and more preferably 0 parts, relative to 100 parts by mass of the hydraulic powder. 1 part by mass or more, and preferably 9 parts by mass or less, more preferably 5 parts by mass or less, still more preferably 1 part by mass or less.
• Hydraulic powder is a powder that has the property of being hardened by a hydration reaction, and examples thereof include cement and gypsum.
• the hydraulic powder is preferably cement, more preferably ordinary portland cement, belite cement, moderate heat cement, early-strength cement, ultra-early-strength cement, sulfate-resistant cement and the like.
• blast furnace slag cement, fly ash cement, silica fume cement, etc. to which powder such as blast furnace slag, fly ash, silica fume and the like having pozzolanic action and / or latent hydraulic property, or stone powder (calcium carbonate powder) is added to cement etc. But it's okay.
• the hydraulic composition of the present invention has a water / hydraulic powder ratio of preferably 10% by mass or more, and preferably 50% by mass or less, more preferably 40% by mass or less, further preferably 30% by mass or less, It is more preferably 25% by mass or less.
• the water / hydraulic powder ratio is a mass percentage (mass%) of water and the hydraulic powder in the hydraulic composition, and is calculated by mass of water / mass of hydraulic powder ⁇ 100. .
• the water / hydraulic powder ratio is calculated based on the amount of water and the amount of powder having physical properties that harden due to a hydration reaction.
• the powder having the physical properties of being hardened by the hydration reaction includes a powder having a pozzolanic action, a powder having latent hydraulicity, and a stone powder (calcium carbonate powder), in the present invention, those powders are selected.
• the amount is also included in the amount of hydraulic powder.
• the powder having the physical properties of being hardened by the hydration reaction contains the high-strength admixture, the amount of the high-strength admixture is also included in the amount of hydraulic powder. This also applies to the following parts by mass that relate to the mass of the hydraulic powder.
• the hydraulic composition of the present invention preferably contains an aggregate.
• aggregates include aggregates selected from fine aggregates and coarse aggregates.
• fine aggregate one specified by No. 2311 in JIS A0203-2014 can be mentioned.
• fine aggregate river sand, land sand, mountain sand, sea sand, lime sand, silica sand and crushed sand of these, blast furnace slag fine aggregate, ferronickel slag fine aggregate, lightweight fine aggregate (artificial and natural) and recycled Fine aggregates and the like can be mentioned.
• coarse aggregate one specified by the number 2312 in JIS A0203-2014 can be mentioned.
• the bulk volume is preferably 50% or more, more preferably 55% or more, further preferably 60% or more, and preferably 100% or less, more preferably 90% or less, further preferably 80% or less. Is.
• the bulk volume is the ratio of the volume (including voids) of coarse aggregate in 1 m 3 of concrete.
• the amount of the fine aggregate used is preferably 500 kg / m 3 or more, more preferably 600 kg / m 3 or more, from the viewpoint of improving the filling property into the mold and the like. It is preferably 700 kg / m 3 or more, and preferably 1,000 kg / m 3 or less, more preferably 900 kg / m 3 or less.
• the amount of fine aggregate used is preferably 800 kg / m 3 or more, more preferably 900 kg / m 3 or more, even more preferably 1,000 kg / m 3 or more, and preferably Is 2,000 kg / m 3 or less, more preferably 1,800 kg / m 3 or less, and further preferably 1,700 kg / m 3 or less.
• the hydraulic composition of the present invention may contain a high-strength admixture.
• the high-strength admixture include powders having a Blaine value of 2,500 cm 2 / g or more or a BET specific surface area of 10 m 2 / g or more, and inorganic powders (excluding cement).
• a powder selected from anhydrous gypsum, silica fume, and fly ash can be mentioned.
• the content of the high-strength admixture is preferably 0.1 part by mass or more, more preferably 0.1 part by mass or more based on 100 parts by mass of hydraulic powder and cement. It is preferably 1 part by mass or more, and preferably 20 parts by mass or less, more preferably 10 parts by mass or less.
• the hydraulic composition of the present invention may be a centrifugal molding hydraulic composition.
• the hydraulic composition of the present invention may be a vibration molding hydraulic composition.
• the hydraulic composition for centrifugal molding is one of the preferable embodiments of the hydraulic composition of the present invention.
• the present invention contains the dispersant composition for a hydraulic composition for centrifugal molding or vibration molding of the present invention, water, and a hydraulic powder, and the water / hydraulic powder ratio is 10% by mass or more and 25% by mass.
• the use of the following composition as a hydraulic composition for centrifugal molding or vibration molding is provided.
• the present invention also contains the dispersant composition for a hydraulic composition for centrifugal molding or vibration molding of the present invention, water, and a hydraulic powder, and the water / hydraulic powder ratio is 10% by mass or more and 25% or more.
• a composition which is less than or equal to% by weight, for producing a hydraulic composition for centrifugal molding or vibration molding.
• the matters described in the dispersant composition for hydraulic composition and the hydraulic composition of the present invention can be appropriately applied.
• the present invention provides a method for producing a hydraulic composition, which comprises mixing the dispersant composition for a hydraulic composition of the present invention, water, and a hydraulic powder.
• the method for producing a hydraulic composition of the present invention is a copolymer containing acrylic acid or a salt thereof, methacrylic acid or a salt thereof, and a compound represented by the following general formula (1) as constituent monomers [(A Component), water, and a hydraulic powder are mixed, wherein the copolymer is acrylic acid or a salt thereof and methacrylic acid or a salt thereof.
• a method for producing a hydraulic composition, wherein the ratio of the acid or its salt is 20 mol% or more and 70 mol% or less.
• specific examples and preferred embodiments of the component (A) are the same as those of the dispersant composition for a hydraulic composition of the present invention.
• the specific examples and preferred embodiments of the hydraulic powder used 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.
• the hydraulic powder is preferably used so that the water / hydraulic powder ratio falls within the range described in the hydraulic composition of the present invention.
• Specific examples and preferred embodiments of the aggregate are the same as those described for the hydraulic composition of the present invention.
• the amount of aggregate used is also the same as that described for the hydraulic composition of the present invention.
• the component (A) and the hydraulic powder such as cement are preliminarily mixed to obtain the hydraulic powder. Mixing is preferred.
• the mixing of the hydraulic powder, water, the component (A), and the component used as necessary can be performed using a mixer such as a mortar mixer and a forced biaxial mixer. Further, the mixture is preferably mixed for 1 minute or more, more preferably 2 minutes or more, and preferably 5 minutes or less, more preferably 3 minutes or less.
• a mixer such as a mortar mixer and a forced biaxial mixer.
• the mixture is preferably mixed for 1 minute or more, more preferably 2 minutes or more, and preferably 5 minutes or less, more preferably 3 minutes or less.
• the materials, agents and their amounts described in the hydraulic composition can be used.
• the obtained hydraulic composition is further filled in a mold to cure and cure.
• the formwork include a formwork for buildings and a formwork for concrete products.
• Examples of the method for filling the mold include a method of directly charging from a mixer and a method of pumping the hydraulic composition with a pump to introduce it into the mold.
• the hydraulic composition When the hydraulic composition is cured, it may be cured by heating to accelerate the curing.
• the heat curing can hold the hydraulic composition at a temperature of 40 ° C. or higher and 90 ° C. or lower to accelerate the curing.
• the present invention is to prepare a hydraulic composition by mixing the dispersant composition for hydraulic composition of the present invention, water, and a hydraulic powder, and fill the mold with the hydraulic composition.
• a method for producing a cured product of a hydraulic composition that is cured is a copolymer containing acrylic acid or a salt thereof, methacrylic acid or a salt thereof, and a compound represented by the following general formula (1) as constituent monomers.
• Component (A) water and hydraulic powder are mixed to produce a hydraulic composition, and the hydraulic composition is filled in a mold and cured to cure the composition.
• the matters described in the dispersant composition for hydraulic composition, the hydraulic composition and the method for producing the hydraulic composition of the present invention can be appropriately applied to the method for producing the hydraulic composition of the present invention.
• specific examples and preferred embodiments of the component (A) are the same as those of the dispersant composition for hydraulic composition of the present invention.
• the specific examples and preferred embodiments of the hydraulic powder used 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.
• the hydraulic powder is preferably used so that the water / hydraulic powder ratio falls within the range described in the hydraulic composition of the present invention.
• it is preferable to mix an aggregate In the method for producing a hydraulic composition of the present invention, it is preferable to mix an aggregate. Specific examples and preferred embodiments of the aggregate are the same as those described for the hydraulic composition of the present invention.
• the amount of aggregate used is also the same as that described for the hydraulic composition of the present invention.
• the hydraulic composition produced by the method for producing a cured product of the present invention is preferably the hydraulic composition of the present invention.
• a dispersant composition for a hydraulic composition of the present invention water, and a hydraulic powder are mixed to produce a hydraulic composition, and the hydraulic composition is A method for producing a cured body of a hydraulic composition is described, in which the mold is filled with a centrifugal force and then the mold is clamped.
• This method comprises, as constituent monomers, acrylic acid or a salt thereof, methacrylic acid or a salt thereof, and a copolymer [(A) component] containing a compound represented by the following general formula (1), and water:
• a method for producing a cured product of a hydraulic composition which comprises mixing a hydraulic powder to produce a hydraulic composition, filling the hydraulic composition in a mold, and then clamping the mold by applying centrifugal force.
• the copolymer is a cured product of a hydraulic composition in which the proportion of acrylic acid or a salt thereof in the total of acrylic acid or a salt thereof and methacrylic acid or a salt thereof is 20 mol% or more and 70 mol% or less.
• This is a manufacturing method (hereinafter referred to as a centrifugal method).
• the centrifugal method is what is called centrifugal compaction molding.
• a hydraulic composition is produced by mixing a dispersant composition for a hydraulic composition of the present invention, water, and a hydraulic powder, and the hydraulic composition
• a method for producing a cured product of a hydraulic composition, in which a product is filled in a mold and then the mold is clamped by applying vibration, can be mentioned.
• This method comprises, as constituent monomers, acrylic acid or a salt thereof, methacrylic acid or a salt thereof, and a copolymer [(A) component] containing a compound represented by the following general formula (1), and water:
• a method for producing a cured body of a hydraulic composition which comprises mixing a hydraulic powder to produce a hydraulic composition, filling the hydraulic composition in a mold, and then clamping with vibration.
• the copolymer is a cured product of a hydraulic composition in which the proportion of acrylic acid or a salt thereof in the total of acrylic acid or a salt thereof and methacrylic acid or a salt thereof is 20 mol% or more and 70 mol% or less.
• Method hereinafter referred to as vibration method).
• the vibration method is what is called vibration compaction molding.
• the method of adding the mixture containing water and the component (A) to the aggregate and the hydraulic powder and mixing the mixture is easy and uniform even when the hydraulic composition is produced. preferable.
• the hydraulic composition may be prepared by mixing the hydraulic powder and the aggregate, adding a mixture containing water and the component (A) so that the mixture amount is as described above, and kneading. it can.
• a mold suitable for the centrifugal method and the vibration method is appropriately selected in consideration of the use of the cured body of the hydraulic composition.
• the filling of the hydraulic composition into the mold can be performed by a known method.
• Examples of the method of filling the obtained hydraulic composition in a mold include a method in which the hydraulic composition after kneading is discharged from the kneading means and manually charged into the mold.
• the hydraulic composition for centrifugal molding filled in a mold is subjected to centrifugal force to clamp the mold. At this time, it is preferable to change the centrifugal force at least once.
• the hydraulic composition for centrifugal molding can be clamped by applying a gradually changing centrifugal force. That is, in the present invention, the hydraulic composition for centrifugal molding is clamped at least once by changing the centrifugal force, and further, it is clamped by applying a centrifugal force that changes stepwise and increases stepwise. You can
• centrifugal force of centrifugal molding is preferably 0.5 G or more and 30 G or less, more preferably 25 G or less. From the viewpoint of energy cost reduction and moldability, it is preferable to keep the centrifugal force in the range of 15 minutes or more, 30 G or less, and further 25 G or less (also referred to as high centrifugal force) for 1 minute or more.
• the compaction by centrifugal force is, for example, 0.5 G or more and 30 G or less, preferably 5 minutes or more, more preferably 7 minutes or more, further preferably 9 minutes or more, and preferably 40 minutes or less.
• compaction by maintaining a high centrifugal force for example, a centrifugal force of 20 G or more, is preferably 1 minute or more, more preferably 3 minutes or more, further preferably 5 minutes or more, and preferably Do less than 15 minutes. That is, in the present invention, the centrifugal force of 0.5 G or more and 30 G or less is applied to the hydraulic composition over 5 minutes or more, more preferably 7 minutes or more, further preferably 9 minutes or more, and preferably 40 minutes or less. You can clamp things. Further, in the present invention, compaction by holding a centrifugal force of 20 G or more can be performed for preferably 1 minute or more, more preferably 3 minutes or more, further preferably 5 minutes or more, and preferably 15 minutes or less.
• Compaction by centrifugal force can be performed in stages, and from the viewpoint of moldability, it is preferable to increase the centrifugal force G stepwise. It can be carried out under the following stage conditions until the desired centrifugal force is achieved.
• the initial velocity of the first stage is 0.5 G or more and less than 2 G
• the second stage of the second stage is 2 G Centrifugal force of 5G or more and more than 0 minutes and 15 minutes or less
• third speed, which is the third stage is 5G or more and less than 10G, more than 0 minutes and 15 minutes or less
• fourth stage the fourth speed Is 10 G or more and less than 20 G with a centrifugal force of more than 0 minutes and 15 minutes or less
• the fifth stage is a centrifugal force of 20 G or more and 30 G or less with a centrifugal force of more than
• Heat curing is preferably performed at 75 ° C or higher, and preferably 100 ° C or lower, more preferably 90 ° C or lower.
• the heating and curing may include a step of holding at 75 ° C. or higher for 1 hour or longer.
• the temperature of heating and curing is the temperature of the atmosphere around the mold filled with the hydraulic composition.
• the ambient temperature is preferably 35 ° C. or lower, more preferably 30 ° C. or lower, more preferably 25 ° C. or lower, and strength developability. From this viewpoint, the temperature is preferably 10 ° C or higher, more preferably 15 ° C or higher, and further preferably 20 ° C or higher.
• low temperature curing it is preferable to carry out low temperature curing for 1 hour or more, starting from the point of time when water first contacts the hydraulic powder during the mixing, before starting the heating curing.
• the low temperature curing is preferably performed at 0 ° C or higher, more preferably 10 ° C or higher, and preferably 40 ° C or lower, more preferably 30 ° C or lower.
• the low temperature curing is preferably carried out for 1 hour or longer, more preferably 2 hours or longer, and preferably 5 hours or shorter, more preferably 4 hours or shorter.
• the heating curing is performed by steam curing.
• the steam curing is performed, for example, by applying steam around the mold filled with the centrifugally-molded hydraulic composition and maintaining it at a predetermined temperature for a certain period of time.
• the hydraulic composition can be cooled and released from the mold.
• the cured body of the demolded hydraulic composition can be cured at room temperature and atmospheric pressure.
• the ambient temperature may be cooled to room temperature, for example, 20 ° C., or the ambient temperature may be room temperature, for example, 20 ° C. at a temperature decreasing rate of 5 ° C. or more and 20 ° C. or less per hour. You may cool down to.
• the molded body is released from the mold.
• the rate of temperature decrease is preferably 20 ° C. or less per hour from the viewpoint of suppressing a decrease in strength due to cracking of the cured body.
• the cured product of the obtained hydraulic composition can be cured at room temperature and atmospheric pressure. Specifically, it can be stored at 20 ° C. under atmospheric pressure.
• the hardened product of the hydraulic composition obtained by the centrifugal method can be used as a centrifugally molded concrete product, and specific examples thereof include piles, poles, and fume tubes.
• the hardened product of the hydraulic composition obtained by the centrifugal method has excellent compaction properties, so that the inner surface and end surface irregularities of the product are small, the surface aesthetics are excellent, and the inner surface of the product is finished smoothly. The obstacles of the cutting machine during the Nakabori method are improved.
• the vibration method involves filling the mold with the hydraulic composition used to manufacture the cured product, and vibrating the hydraulic composition in the mold.
• the operation of applying vibration to the hydraulic composition is also referred to as vibration molding.
• Vibration molding can be performed at a frequency of 20 Hz to 350 Hz, for example. Further, the vibration molding can be performed in, for example, 3 seconds or more and 180 seconds or less. When the mold cannot be sufficiently filled by one filling, when filling the additional hydraulic composition, even if vibration of the previous hydraulic composition is stopped or continued to be applied, either Good.
• a method for producing a cured product of the hydraulic composition of the present invention a method for producing a cured product of a hydraulic composition containing a polycarboxylic acid-based dispersant, hydraulic powder and water, A method for producing a cured product of a hydraulic composition, in which vibration is applied after filling the composition with a mold, can be mentioned.
• Another example of the method for producing a cured product of the hydraulic composition of the present invention is a method for producing a cured product of a hydraulic composition containing a polycarboxylic acid-based dispersant, hydraulic powder and water. Then, a method for producing a cured product of a hydraulic composition, in which a hydraulic composition used for producing a cured product is filled in a mold and the hydraulic composition in the mold is vibrated, can be mentioned.
• the moldability during vibration molding can be improved.
• a method for improving the moldability of a hydraulic composition in a vibration molding step using the dispersant composition for a hydraulic composition of the present invention is provided.
• the dispersant composition for hydraulic composition of the present invention By using the dispersant composition for hydraulic composition of the present invention, it is possible to improve compaction property of the hydraulic composition by centrifugal force during centrifugal molding. According to the present invention, there is provided a method for improving the compaction property of a hydraulic composition by centrifugal force, using the dispersant composition for a hydraulic composition of the present invention.
• the strength of the cured product of the hydraulic composition is improved.
• the present invention provides a method for improving the strength of a cured product of a hydraulic composition using the dispersant composition for a hydraulic composition of the present invention.
• Example ⁇ (A) component> the constitution of the copolymer will be shown with acrylic acid or its salt as AA, methacrylic acid or its salt as MAA, and the compound represented by the general formula (1) as compound (1). Further, the ratio (mol%) of acrylic acid or a salt thereof in the total of acrylic acid or a salt thereof and methacrylic acid or a salt thereof is shown as an AA ratio.
• Copolymer 8: AA / MAA / Compound (1) sodium acrylate
• Example 1 and Comparative Example 1 (1) Mortar formulation The mortar formulation is shown below.
• the standard rod is gradually lowered from near the surface of the mortar by its own weight, and the indentation length of the standard rod into the mortar at the time when the mortar stops is measured immediately after the mortar is prepared.
• the standard indentation depth of the standard rod is gradually lowered from near the surface of the mortar to the surface of the mortar at intervals of 10 seconds after the first standard rod is lowered, and when the lowering is stopped, the distance between the tip of the standard rod and the bottom plate is 0.1 mm. It was read and recorded in units, and the time until the distance between the tip of the standard rod and the bottom plate remained unchanged three times was measured. The results are shown in Table 1.
• the AA ratio is the ratio (mol%) of AA in the total of AA and MAA.
• Mw is a weight average molecular weight.
• EOp is the average number of moles of ethylene oxide added, and corresponds to n in the general formula (1).
• the addition amount is a mass part in terms of effective components with respect to 100 mass parts of the hydraulic powder (cement and high-strength admixture) (hereinafter the same).
• standard bar depth is the standard bar depth immediately after mortar preparation.
• the "invariant time of indentation depth” is the time until the distance between the tip of the standard rod and the bottom plate does not change three consecutive times.
• Dispersant A is a dispersant having the following composition (the same applies hereinafter).
• Copolymer 1 / copolymer 5 / glycerin / sodium gluconate 80/14/4/2 (mass ratio)
• Example 2 and Comparative Example 2 (1) Mortar formulation The mortar formulation is shown below.
• Formula (II) f (x): approximate expression under rising shear conditions
• Example 3 and Comparative Example 3> Concrete mix The concrete mix is shown below.
• Example 3-1 a predetermined amount of AA was used as a constituent monomer for Comparative Example 3-1 using a copolymer not containing AA as a constituent monomer and Comparative Example 3-2 containing no compound (1).
• Examples 3-1a to 3-1e and Example 3-2 using the copolymers containing them showed good centrifugal compaction properties. This means that, at the end of molding, the copolymers of Examples showed a high yield value due to the network structure of the formed hydration product as a result of the hydration of cement particles being promoted by the flexible molecular structure, and the centrifugal force. It is considered that this is because the concrete was fluidized due to the rattling accompanying the rotation of the metal mold during the molding, and the filling property of the mortar component into the aggregate gap was improved.

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