CN113698140A - Composition for aerated concrete or lightweight aggregate concrete - Google Patents

Composition for aerated concrete or lightweight aggregate concrete Download PDF

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Publication number
CN113698140A
CN113698140A CN202010430205.9A CN202010430205A CN113698140A CN 113698140 A CN113698140 A CN 113698140A CN 202010430205 A CN202010430205 A CN 202010430205A CN 113698140 A CN113698140 A CN 113698140A
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weight
group
aggregate
composition
combinations
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刘海峰
肖德炎
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Coatex SAS
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Coatex SAS
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Priority to CN202010430205.9A priority Critical patent/CN113698140A/en
Priority to US17/997,770 priority patent/US20230192545A1/en
Priority to PCT/IB2021/000366 priority patent/WO2021234461A1/en
Publication of CN113698140A publication Critical patent/CN113698140A/en
Pending legal-status Critical Current

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    • 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
    • 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
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/0076—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials characterised by the grain distribution
    • 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
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/0076—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials characterised by the grain distribution
    • C04B20/008—Micro- or nanosized fillers, e.g. micronised fillers with particle size smaller than that of the hydraulic binder
    • 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
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/02—Treatment
    • C04B20/026—Comminuting, e.g. by grinding or breaking; Defibrillating fibres other than asbestos
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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    • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/16—Sulfur-containing compounds
    • C04B24/161—Macromolecular compounds comprising sulfonate or sulfate groups
    • C04B24/163—Macromolecular compounds comprising sulfonate or sulfate groups obtained by reactions only involving carbon-to-carbon unsaturated bonds
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    • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/24—Macromolecular compounds
    • C04B24/243—Phosphorus-containing polymers
    • C—CHEMISTRY; METALLURGY
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    • 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
    • C—CHEMISTRY; METALLURGY
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    • 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
    • C04B28/021—Ash cements, e.g. fly ash cements ; Cements based on incineration residues, e.g. alkali-activated slags from waste incineration ; Kiln dust cements
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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    • 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
    • C04B28/04—Portland cements
    • C—CHEMISTRY; METALLURGY
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    • 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
    • C04B28/06—Aluminous cements
    • C—CHEMISTRY; METALLURGY
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    • 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
    • C04B28/06—Aluminous cements
    • C04B28/065—Calcium aluminosulfate cements, e.g. cements hydrating into ettringite
    • 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
    • C04B28/08—Slag cements
    • 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
    • C04B28/14—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 calcium sulfate cements
    • 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
    • C04B28/14—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 calcium sulfate cements
    • C04B28/16—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 calcium sulfate cements containing anhydrite, e.g. Keene's cement
    • 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
    • C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
    • C04B38/10—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by using foaming agents or by using mechanical means, e.g. adding preformed foam
    • 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
    • C08F120/00—Homopolymers 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
    • C08F120/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F120/04—Acids; Metal salts or ammonium salts thereof
    • C08F120/06—Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C1/00—Building elements of block or other shape for the construction of parts of buildings
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
    • E04C2/02—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials
    • E04C2/04—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of concrete or other stone-like material; of asbestos cement; of cement and other mineral fibres
    • E04C2/049—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of concrete or other stone-like material; of asbestos cement; of cement and other mineral fibres completely or partially of insulating material, e.g. cellular concrete or foamed plaster
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/20—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of concrete or other stone-like material, e.g. with reinforcements or tensioning members
    • C—CHEMISTRY; METALLURGY
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    • C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
    • C04B2103/52—Grinding aids; Additives added during grinding

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Abstract

The present invention relates to the field of aqueous compositions for the preparation of special concretes, such as aerated concrete or lightweight aggregate concrete. The invention provides aqueous compositions for the preparation of such concretes, which combine together water, a hydraulic binder and aggregates ground in the presence of a specific anionic polymer. The ground aggregate is selected from the group consisting of slag, fly ash, sand, and combinations thereof. The invention also relates to methods of making the compositions and methods of using the compositions.

Description

Composition for aerated concrete or lightweight aggregate concrete
Technical Field
The present invention relates to the field of aqueous compositions for the preparation of special concretes, such as aerated concrete or lightweight aggregate concrete. The invention provides aqueous compositions for the preparation of such concretes, which combine together water, a hydraulic binder and aggregates ground in the presence of a specific anionic polymer. The ground aggregate is selected from the group consisting of slag, fly ash, sand, and combinations thereof. The invention also relates to methods of making the compositions and methods of using the compositions.
Background
Compared with conventional concrete, the aerated concrete and lightweight aggregate concrete have specific and improved properties. Aerated concrete and lightweight aggregate concrete are materials that are particularly useful as thermal insulation. These materials are also known as sound absorbing materials. The aerated concrete and lightweight aggregate concrete can also produce various concrete products with improved properties, especially various concrete products with reduced weight or improved mechanical strength. In their particular manufacturing process, large amounts of gas are incorporated into the solid structure due to the use of conventional materials, in particular aggregates and hydraulic binders. The gas incorporated into the concrete is typically air or hydrogen.
Aerated concrete and lightweight aggregate concrete are generally prepared starting from aqueous suspensions of various particulate materials, in particular aggregates and hydraulic binders. The compositions used to prepare aerated concrete also typically comprise an expanding agent in combination with lime or in combination with a lime-containing material. The compositions used to prepare lightweight aggregate concrete typically also contain a foaming agent or air entraining agent. In the preparation method of aerated concrete or lightweight aggregate concrete, these other components generate gas that is mixed into the concrete structure.
In these preparation methods, especially during gas expansion, the particulate material should be well dispersed and should not form particulate aggregates. In addition, the particle size of these particulate materials should be well controlled so as to avoid problems with the resulting concrete. Poor dispersion of the particulate material which may result in loss of mechanical strength, reduced workability of the resulting concrete, segregation or exudation of the concrete should be avoided.
To prepare aerated and lightweight aggregate concrete, the particulate material used, in particular the aggregate, is ground before it is added to the aqueous compositions used to prepare these concretes. In the grinding process of the aggregate, it is important to control the grinding time and to control the particle size. It is also important to control the viscosity or flowability and increase the solids ratio during or after milling of these materials.
The prior art methods for preparing aqueous compositions for preparing aerated concrete or lightweight aggregate concrete do not provide an effective solution to these problems. Accordingly, there is a need for improved methods of making such compositions.
Disclosure of Invention
The present invention provides a process for the preparation of an aqueous composition for the preparation of aerated concrete or for the preparation of lightweight aggregate concrete which process is capable of solving in whole or in part the problems encountered with the processes of the prior art.
Accordingly, the present invention provides an aqueous composition (C) for the preparation of aerated concrete or for the preparation of lightweight aggregate concrete, comprising:
-water, which is water,
-at least one aggregate (a) comprising a silica-containing material, said material being at least one molecular weight MW(determined by SEC) of less than 20000g/mol and a Polydispersity Index (PI) of less than 3.5, in the presence of a polymer (P) selected from hydrogen peroxide, ammonium persulphate, tert-butyl hydroperoxide, alkali persulphatePrepared by radical polymerization of at least one anionic monomer (M) comprising at least one polymerizable ethylenic unsaturation and a carboxylic acid group, in the presence of at least one radical-generating compound of a salt, optionally with Fe, in water or a solvent at a temperature equal to or higher than 20 ℃II、FeIII、CuI、CuIIAnd combinations thereof, optionally in combination with at least one compound selected from the group consisting of sodium bisulfite, potassium bisulfite, ammonium bisulfite, sodium hypophosphite, potassium hypophosphite, ammonium hypophosphite, disodium 2,2' - (thiocarbonyldithio) Dipropionate (DPTTC), and combinations thereof, and
-at least one hydraulic binder (B).
The essential feature of the composition according to the invention is that the aggregates (A) contained therein are ground before incorporation into the composition (C). Preferably, according to the invention, the aggregates (A) are subjected to wet grinding. Usually, the wet grinding of the aggregate (A) is carried out in the presence of water, and therefore the wet grinding is carried out in the form of an aqueous suspension of the aggregate (A) in water.
According to the invention, the grinding of the aggregates (A) is carried out in the presence of at least one polymer (P).
Preferably, according to the invention, the composition (C) comprises aggregates (a) which are ground, preferably wet-milled, in the presence of the at least one polymer (P) before being added to the composition.
More preferably, the aggregate (a) is ground with a sand mill, roll mill or bead mill. Still more preferably, according to the invention, the aggregate (A) has an average particle size of less than 100 mesh (149 μm) or less than 15% by weight of the particles of the aggregate (A) have an average particle size of more than 200 mesh (74 μm). Any percentages expressed in accordance with the present invention are weight percentages (wt%), unless otherwise indicated.
In the course of grinding the aggregates (A), the polymer (P) is generally capable of increasing the solids content of the aqueous suspension compared with grinding processes in which the polymer (P) is not present. The polymer (P) also enables the viscosity of the aqueous suspension to be controlled during or after grinding. Furthermore, the polymer (P) is capable of controlling the flowability of the aqueous suspension during or after the grinding.
By using the polymer (P) in the grinding process, the particle size of the aggregate (A) can also be controlled.
Preferably, the composition according to the invention comprises aggregate (a) comprising at least 10% by weight of silica. More preferably, the aggregate (a) is a material selected from the group consisting of slag, fly ash, sand, and combinations thereof. According to the invention, the most preferred aggregate (A) is slag or fly ash.
More preferably, according to the invention, less than 13% by weight, more preferably less than 12% by weight of the particles of the ground slag aggregate (A) have an average particle diameter of more than 200 mesh. Even more preferably, less than 7%, more preferably less than 6% by weight of the particles of the milled fly ash aggregate (a) have an average particle size greater than 200 mesh. Still more preferably, less than 11% by weight of the particles of the ground aggregate (a) have an average particle size greater than 200 mesh.
The polymer (P) used in the process of grinding the aggregate (A) contained in the composition (C) according to the invention is an essential feature. According to the invention, the polymer (P) is prepared by radical polymerization in water or in a solvent at a temperature equal to or higher than 20 ℃. According to the invention, the polymer (P) can be prepared in a solvent alone or in a mixture of a solvent and water, in particular an alcoholic solvent, in particular isopropanol. Preferably, the polymer (P) is prepared in water. According to the invention, the polymer (P) is prepared by radical polymerization carried out at a temperature equal to or higher than 20 ℃, preferably at a temperature equal to or higher than 50 ℃.
According to the invention, the molecular weight M of the polymer (P)W(measured by SEC) less than 20000 g/mol. Preferably, according to the invention, the weight-average molecular weight M of the polymer (P)WLess than 15000g/mol or less than 7500g/mol, more preferably less than 6500g/mol, less than 6000g/mol, even more preferably less than 5500 g/mol.
Also preferably, according to the invention, the weight-average molecular weight M of the polymer (P)WGreater than 1000g/mol or greater than 1200g/mol or greater than 1500 g/mol.
According to the invention, the Polydispersity Index (PI) (measured by SEC) of the polymer (P) is less than 3.5. Preferably, according to the invention, the Polydispersity Index (PI) of the polymer (P) is less than 3.2 or less than 3, or the Polydispersity Index (PI) is from 1.5 to 3.5, more preferably from 1.5 to 3.2 or from 1.5 to 3.
According to the invention, the molecular weight and polydispersity index of the polymer are determined by Size Exclusion Chromatography (SEC). The technique is implemented by a Waters liquid chromatograph equipped with a detector. The detector is a waters refractive index detector. The liquid chromatograph is equipped with a size exclusion column for separating the polymers of different molecular weights of interest. The liquid elution phase is a liquid containing 0.05M NaHCO3、0.1M NaNO30.02M triethanolamine and 0.03% NaN3To a pH of 9.00 in the aqueous phase with 1N sodium hydroxide.
According to the first step, the polymer solution is diluted in the solubilizer of SEC to 0.9% of dry weight, which corresponds to the liquid elution phase of SEC, to which 0.04% of dimethylformamide is added as a flow rate marker or internal standard. Then, the mixture was filtered through a 0.2 μm filter. Then 100. mu.L of the mixture was injected into a chromatograph (eluent: using 0.05M NaHCO)3、0.1M NaNO30.02M triethanolamine and 0.03% NaN3The aqueous phase was adjusted to pH 9.00) with 1N sodium hydroxide.
The liquid chromatograph apparatus has an isocratic pump (Waters 515) whose flow rate is set to 0.8 mL/min. The chromatograph also includes an oven, which itself includes the following series-connected chromatographic column systems: a Waters Ultrahydrogel Guard pre-column of 6cm length and 40mm internal diameter and a Waters Ultrahydrogel linear column of 30cm length and 7.8mm internal diameter. The detection system consisted of a Waters 410RI refractive index detector. The oven was heated to 60 ℃ and the refractometer to 45 ℃.
Molecular weight was assessed by detecting dynamic light scattering using a Viscotek 270 dual detector to determine molecular weight based on the hydrodynamic volume of the polymer.
The chromatograph is calibrated by means of powdered sodium polyacrylate powders of different molecular weights, which are obtained by the supplier: polymer standard services company or us polymer standard company.
The polymer (P) according to the invention is prepared from at least one anionic monomer (M) comprising at least one polymerizable ethylenic unsaturation and a carboxylic acid group. Preferably, according to the present invention, the anionic monomer (M) is selected from acrylic acid, methacrylic acid, salts of acrylic acid, salts of methacrylic acid and combinations thereof, preferably acrylic acid.
According to the invention, the polymer (P) can be prepared using one or more than one monomer (M). The polymer (P) may also be prepared using one or more than one other monomer. Thus, 100% by weight of the anionic monomer (M) can be used for the polymerization. It is also possible to carry out the polymerization reaction using from 70% to 99.5% by weight of anionic monomer (M) and from 0.5% to 30% by weight of at least one other monomer.
Preferably, according to the present invention, the further monomer may be selected from another different anionic monomer selected from acrylic acid, methacrylic acid, itaconic acid, maleic acid, salts thereof and combinations thereof.
Also preferably, according to the present invention, the further monomer may be selected from nonionic monomers comprising at least one polymerizable ethylenic unsaturation, preferably at least one polymerizable ethylenic unsaturation, especially a polymerizable vinyl group, more preferably the nonionic monomers are selected from esters of acids comprising at least one monocarboxylic acid group, especially from esters of acids selected from acrylic acid, methacrylic acid and combinations thereof, such as styrene, vinyl caprolactam, alkyl acrylates, especially C acrylic acid1-C10Alkyl esters, preferably acrylic acid C1-C4Alkyl esters, more preferably methyl acrylate, ethyl acrylate, propyl acrylate, isobutyl acrylate, n-butyl acrylate, alkyl methacrylates, especially C-methacrylic acid1-C10Alkyl esters, preferably methacrylic acid C1-C4The alkyl ester is more preferably methyl methacrylate, ethyl methacrylate, propyl methacrylate, isobutyl methacrylate, n-butyl methacrylate, or aryl acrylate, preferably phenyl acrylate, benzyl acrylate, phenoxyethyl acrylate, or aryl methacrylate, preferably phenyl methacrylate, benzyl methacrylate, or phenyl methacrylateOxyethyl ester, compound of formula (I):
R1-(L1)m-(L2)n-R2
(I)
wherein:
-R1represents a polymerizable group selected from the group consisting of acrylate group, methacrylate group, vinyl group, allyl group, methallyl group and isopentenyl group, preferably represents a polymerizable group selected from the group consisting of acrylate group and methacrylate group,
-R2represents an OH group or OCH3The base group is a group of a compound,
-L1and L2The same or different, independently represent an ethylene-oxy group or a propylene-oxy group, and
-m and n, equal or different, and at least one of which is different from 0, represent a number less than or equal to 150, and their sum m + n is less than 150.
Also preferably, according to the present invention, the other monomer may be selected from the group consisting of 2-acrylamido-2-methylpropanesulfonic acid, 2-acrylamido-2-methylpropanesulfonic acid salt, 2- (methacryloyloxy) ethanesulfonic acid salt, sodium methallylsulfonate, sodium vinylsulfonate, sodium 1-allyloxy-2-hydroxypropanesulfonate (CAS #52556-42-0, 7732-18-5, 106-92-3, 106-89-8), allyl ether phosphate, ammonium salt, styrenesulfonate, and combinations thereof.
The polymer (P) according to the invention is prepared in the presence of at least one compound which generates free radicals. Preferably, according to the present invention, the radical generating compound is selected from the group consisting of hydrogen peroxide, sodium persulfate, potassium persulfate, ammonium persulfate, and combinations thereof.
According to the invention, the polymer (P) can be prepared by using from 2 to 8% by weight, preferably from 2.5 to 7% by weight or from 2.5 to 6% by weight, of sodium hypophosphite, relative to the weight of the monomers.
The polymer (P) may also be prepared by using from 0.01 to 1.5% by weight, preferably from 0.01 to 1.2% by weight or from 0.05 to 1.5% by weight, more preferably from 0.05 to 1.2% by weight or from 0.1 to 1% by weight, of disodium 2,2' - (thiocarbonyldithio) Dipropionate (DPTTC), relative to the weight of the monomers.
The polymer (P) may also be prepared by using 0.1 to 5% by weight of a radical generating compound or preferably 0.5 to 4.5% by weight of hydrogen peroxide, or by using 0.1 to 4% by weight of sodium, potassium or ammonium persulfate, relative to the amount of monomers.
In addition to water and aggregates (A), the composition (C) according to the invention also comprises at least one hydraulic binder (B). Preferably, according to the invention, the hydraulic binder (B) is selected from the group consisting of cement, portland cement, aluminous cement, calcium sulfoaluminate cement, cements defined in the EN 197-1 standard (e.g. CEM I cement, CEM II cement, CEM III cement, CEM IV cement and CEM V cement), slag, fly ash, gypsum (preferably calcined gypsum or anhydrite) and combinations thereof.
In the composition (C) according to the invention, the amounts of the individual components may vary. Preferably, the present invention provides a composition (C) comprising:
-20 to 45% by weight of water,
-35 to 70% by weight of aggregate (A),
10 to 20% by weight of a hydraulic binder (B).
More preferably, the present invention provides a composition (C) comprising:
-30 to 40% by weight of water,
-40 to 60% by weight of ground aggregate (A),
10 to 20% by weight of a hydraulic binder (B).
Preferred compositions (C) according to the invention comprise 35% by weight of water, 50% by weight of ground aggregate (a) and 15% by weight of hydraulic binder (B).
The composition (C) according to the invention may comprise at least one other aggregate. Preferably, the other aggregate is selected from the group consisting of sand, quartz sand, gravel, expanded clay, fly ash, and combinations thereof.
The compositions (C) according to the invention can be prepared by methods known per se. For example, the composition (C) according to the present invention may be prepared by a method comprising mixing the ground aggregate (a) and the binder (B) with water.
The invention makes it possible to reduce the amount of binder (B) used, while maintaining the properties of the composition (C), in particular its mechanical or rheological properties, compared with a similar composition in which the aggregates (a) are ground in the absence of the polymer (P). The invention therefore also provides a process for preparing an aqueous composition (C) for preparing aerated concrete or for preparing lightweight aggregate concrete, comprising water, at least one aggregate (A) comprising silica and at least one hydraulic binder (B),
wherein the aggregate (A) is at least one molecular weight MWGround (determined by SEC) in the presence of a polymer (P) having a Polydispersity Index (PI) of less than 3.5, said polymer being prepared by radical polymerization in water or a solvent at a temperature equal to or higher than 20 ℃ in the presence of at least one radical-generating compound selected from hydrogen peroxide, ammonium persulfate, tert-butyl hydroperoxide, alkali metal persulfates, said anionic monomer comprising at least one polymerizable ethylenic unsaturation and a carboxylic acid group, said radical-generating compound being optionally reacted with a compound selected from FeII、FeIII、CuI、CuIIAnd combinations thereof, optionally in combination with at least one compound selected from the group consisting of sodium bisulfite, potassium bisulfite, ammonium bisulfite, sodium hypophosphite, potassium hypophosphite, ammonium hypophosphite, disodium 2,2' - (thiocarbonyldithio) Dipropionate (DPTTC), and combinations thereof,
and whereby the amount of binder (B) is reduced compared to a similar composition wherein the aggregate (a) is ground in the absence of polymer (P).
According to the invention, the amount of binder (B) can be reduced by 1, 2, 5 or 10% by weight compared to a similar composition in which the aggregate (a) is ground in the absence of polymer (P).
The present invention mainly provides an aqueous composition (C) for the preparation of aerated concrete or for the preparation of lightweight aggregate concrete.
Preferably, the present invention provides an aqueous composition (C1) for use in the preparation of aerated concrete, preferably for use in the preparation of autoclaved aerated concrete. According to the invention, the composition (C1) is an aqueous composition (C) further comprising at least one expanding agent and at least one material selected from lime, lime-containing materials and combinations thereof. More preferably, the expanding agent is mixed with lime.
Preferably, according to the invention, the expanding agent is a zinc-containing material or an aluminium-containing substance. More preferably, the expanding agent is a material selected from the group consisting of free metallic aluminum, more preferably aluminum powder or aluminum paste, and combinations thereof. The most preferred expanding agent is free metallic aluminum.
Preferred compositions (C1) according to the invention comprise:
-20 to 45% by weight of water,
-35 to 65% by weight of ground aggregate (A),
10 to 20% by weight of a hydraulic binder (B),
-3 to 9.98% by weight of lime-containing material,
-0.02 to 2% by weight of a swelling agent.
More preferred compositions according to the invention (C1) comprise:
-20 to 45% by weight of water,
-35 to 65% by weight of ground aggregate (A),
10 to 20% by weight of a hydraulic binder (B),
-4 to 9.97% by weight of lime-containing material,
-0.03 to 1% by weight of a swelling agent.
A preferred composition according to the invention (C1) comprises 35% by weight of water, 45% by weight of ground aggregate (a), 13% by weight of hydraulic binder (B), 6.96% by weight of lime-containing material and 0.04% by weight of expansion agent.
Also preferably, the present invention provides an aqueous composition (C2) for the preparation of lightweight aggregate concrete, preferably for the preparation of foamed concrete. According to the invention, the composition (C2) is an aqueous composition (C) which also comprises a foaming agent or air-entraining agent.
Preferably, according to the invention, the foaming agent or air-entraining agent is selected from surfactants. More preferably, according to the invention, the foaming agent is selected from sodium laureth sulfate (sodium lauryl ether sulfate or SLES), sodium lauryl sulfate (sodium lauryl sulfate or SDS), Ammonium Lauryl Sulfate (ALS), sodium alpha-olefin sulfate, sodium lauryl sulfonate, ammonium lauryl sulfonate, C14-C16-alpha-olefinsulfonic acid sodium salt, alkyl polyglycol ether sulfate, a mixture of aqueous ammonium salt solution and butylene glycol, an aqueous solution of anionic and nonionic surfactants, a mixture of bissunflower ethyl dimethyl ammonium chloride (disulphurylethyldimonium chloride) and sunflower seed oil glyceride, and lauryl lactylate, and combinations thereof.
Preferred compositions (C2) according to the invention comprise:
-20 to 45% by weight of water,
-35 to 65% by weight of ground aggregate (A),
10 to 20% by weight of a hydraulic binder (B),
-5 to 10% by weight of a blowing or air-entraining agent.
More preferred compositions according to the invention (C2) comprise:
-20 to 45% by weight of water,
-35 to 65% by weight of ground aggregate (A),
11 to 20% by weight of a hydraulic binder (B),
-5 to 9% by weight of a blowing or air-entraining agent.
The preferred composition (C2) according to the invention comprises 35% by weight of water, 45% by weight of ground aggregate (a), 13% by weight of hydraulic binder (B) and 7% by weight of foaming or air-entraining agent.
In addition to the aqueous compositions (C), (C1) and (C2), the present invention also provides compositions in solid form, for example dry mix compositions. The solid form composition according to the invention may be used to prepare an aqueous composition for use in the preparation of aerated concrete or lightweight aggregate concrete.
The compositions of the invention in solid form can be prepared starting from the aqueous compositions of the invention by removing water from such aqueous compositions. Preferably, the water is removed by filtration, drying, centrifugation or a combination of these means. More preferably, the water is removed by drying the aqueous composition according to the invention.
The aqueous composition according to the invention can be used for the preparation of aerated concrete or lightweight aggregate concrete. According to the present invention, the aerated concrete or lightweight aggregate concrete obtained using the aqueous composition according to the present invention can be used for manufacturing various articles. Therefore, the invention provides an aerated concrete product and a lightweight aggregate concrete product.
Preferably, the present invention provides an aerated concrete article which is an autoclaved aerated concrete article prepared according to a method comprising:
a-casting at least one composition according to the invention (C1),
b-heating and pressurizing the cast composition.
More preferably, the cast composition is heated and pressurized in an autoclave reactor.
The present invention also provides a lightweight aggregate concrete article which is a foamed concrete article prepared according to a method comprising:
a-casting at least one composition according to the invention (C2),
b-drying the cast composition.
The composition according to the invention allows the preparation of concrete articles having various forms or shapes. Preferably, the present invention provides an aerated concrete product or lightweight aggregate concrete product selected from the group consisting of a block (in particular a plain block, a round block, a U-shaped block), a panel (in particular a floor, roof panel, wall panel, partition panel) and a lintel.
The process according to the invention is particularly advantageous in providing the ground aggregate (a) with improved properties. The invention therefore also provides an aggregate (a) for the preparation of an aerated concrete composition or a lightweight aggregate concrete composition, which is obtained by the process according to the invention.
The aggregates (a) according to the invention are preferably materials selected from the group consisting of slag, fly ash, sand, which are ground in the presence of at least one polymer (P) as defined according to the invention.
The invention also provides a process for preparing the aggregate (A) according to the invention, which comprises grinding a silica-containing material in the presence of at least one polymer (P) having a molecular weight MW(determined by SEC) of less than 20000g/mol and a Polydispersity Index (PI) of less than 3, said polymer being prepared by radical polymerization in water or a solvent at a temperature equal to or higher than 20 ℃ in the presence of at least one radical-generating compound selected from hydrogen peroxide, ammonium persulfate, tert-butyl hydroperoxide, alkali metal persulfates, said anionic monomer comprising at least one polymerizable ethylenic unsaturation and a carboxylic acid group, said radical-generating compound being optionally reacted with a compound selected from FeII、FeIII、CuI、CuIIAnd combinations thereof, optionally in combination with at least one compound selected from the group consisting of sodium bisulfite, potassium bisulfite, ammonium bisulfite, sodium hypophosphite, potassium hypophosphite, ammonium hypophosphite, disodium 2,2' - (thiocarbonyldithio) Dipropionate (DPTTC), and combinations thereof.
Advantageous, specific or preferred features of the composition (C) according to the invention allow to define respectively the composition (C1), the composition (C2), the aggregate (a), the concrete article and the method, which are also advantageous, specific or preferred according to the invention.
Detailed Description
The examples provide illustrations of various aspects of the invention.
Preparation of the Polymer (P1) used according to the invention
The polymer according to the invention (P1) was prepared in a one liter glass reactor equipped with mechanical stirring and oil bath heating by introducing 212g of water and 0.08g of the sodium salt of iron sulfate heptahydrate.
In a 500mL beaker equipped with a metering pump, 303g of 100% by weight acrylic acid and 15g of water were introduced.
25.6g of sodium hypophosphite monohydrate dissolved in 30g of water were introduced into a 100mL test tube equipped with a dosing pump.
21g of 130V hydrogen peroxide and 35g of water were introduced into a 100mL test tube equipped with a dosing pump.
The reactor was heated to 95 ℃ and acrylic acid, hypophosphite solution and hydrogen peroxide solution were added simultaneously over 120 minutes while maintaining the temperature of the reaction medium at 95 ℃. Finally, the pump is flushed with water and the medium is heated for 60 minutes to 95 ℃.
The polymer solution was then treated with 50 wt% aqueous sodium hydroxide to pH 8 and then diluted to 42 wt% of dry extract. The molecular weight (Mw as measured by SEC) of the resulting polymer (P1) was 4800g/mol and the IP was 2.2.
Preparation of ground aggregate according to the invention from fly ash (A)
An aqueous suspension of aggregate (a) (S1) was prepared starting from fly ash, which was derived from fine solid particles (200g) in the soot produced by the combustion of fuel, and this was mixed with water (80g) and polymer (P1) (2g dry matter) in a 0.5L jar containing ceramic beads (alumina type, 2cm diameter) (200g) as grinding medium. The milling time was 5 minutes. The suspension (S1) had a solids content of 54%.
A comparative suspension (CS1) was prepared in the same way without any polymer (P1). The solids content of the comparative suspension (S2) was 54%.
The second aqueous suspension (S2) of the invention is prepared, similarly to the suspension (S1), from the aggregates (a), while using a reduced amount of water (35 g). The solids content of the suspension according to the invention (S2) was 64%.
According to the present invention, the properties of the prepared suspension were evaluated by measuring fluidity, density and particle size analysis.
The flowability was measured by a flow test die having a diameter of 3 cm and a height of 5 cm.
The density was measured by a density cup with a volume of 100 mL.
Particle size analysis was performed with a 200 mesh sieve. Aggregate particles having a size of more than 200 mesh (74 μm) were weighed out.
The results are shown in table 1.
Suspension liquid Fluidity (mm) Density (g/ml) Particle size analysis (% by weight)
CS1 180 1.43 7.4
S1 230 1.43 6.6
S2 190 1.59 5.5
TABLE 1
The use of the polymer (P1) during the preparation of the suspensions according to the invention (S1) and (S2) makes it possible to maintain or improve the flowability, density and particle size analysis compared to the comparative suspension (CS 1).
Preparation of ground aggregate according to the invention starting from slag (A)
Starting from slag (200g) produced as a by-product in a blast furnace iron-making process, an aqueous suspension of aggregate (A) was prepared by mixing it with water (160g) and polymer (P1) (2g dry matter) in a 0.5L jar packed with ceramic beads (alumina type, diameter 2cm) (300g) as a grinding medium (S3). The milling time was 10 minutes. The solids content of the suspension (S3) was 54 wt.%.
A comparative suspension (CS2) was prepared in the same way without any polymer (P1). A further comparative suspension (CS3) was prepared analogously to the comparative suspension (CS2), using an increased amount of water (220 g). The solids content of the suspension (CS3) was 47 wt%.
The properties of the prepared suspensions were evaluated by measuring flowability, density and particle size analysis. The results are shown in table 2.
Suspension liquid Fluidity (mm) Density (g/ml) Particle size analysis (% by weight)
CS2 80 1.47 13
S3 170 1.47 11
CS3 150 1.38 17
TABLE 2
Preparation of ground aggregate according to the invention starting from sandy soil (A)
Starting from river sand (200g), an aqueous suspension of aggregate (A) (S4) was prepared by mixing it with water (100g) and polymer (P1) (2g dry matter) in a 0.5L jar containing ceramic beads (alumina type, diameter 2cm) (300g) as grinding medium. The milling time was 10 minutes. The solids content of the suspension (S4) was 64 wt%.
A comparative suspension (CS4) was prepared in the same way without any polymer (P1). A further comparative suspension (CS5) was prepared analogously to the comparative suspension (CS4), using an increased amount of water (160 g). The suspension (CS5) had a solids content of 54 wt.%.
The properties of the prepared suspensions were evaluated by measuring flowability, density and particle size analysis. The results are shown in table 3.
Suspension liquid Fluidity (mm) Density (g/ml) Particle size analysis (% by weight)
CS4 95 1.66 11
S4 210 1.66 10
CS5 210 1.49 15
TABLE 3
The aerated concrete or lightweight aggregate concrete composition according to the invention can then be prepared by incorporating the different aggregates (a) ground according to the invention in combination with a cement binder (B) and water. The improved particle size analysis of the aggregate suspensions prepared according to the invention allows the properties of the concrete compositions thus prepared to be improved. In particular, a reduced amount of ground aggregate particles having a particle size greater than 200 mesh (74 μm) in a suspension prepared using the polymer (P1) may produce an aerated concrete or lightweight aggregate concrete composition having improved mechanical properties, and may result in improved concrete articles. Improving the particle size analysis of the ground aggregate can also reduce the amount of binder required to obtain an aerated concrete or lightweight aggregate concrete composition with acceptable specifications when manufacturing an aerated concrete or lightweight aggregate concrete article. The higher solids content of the aggregate suspension prepared according to the invention also leads to a reduction in the water content of the aerated concrete or lightweight aggregate concrete composition, so that the consumption of binder can be reduced.
In addition, the improved particle size analysis may reduce or eliminate the risk of poor dispersion, segregation, or bleeding due to the presence of a large number of aggregate particles having an excessively large particle size.

Claims (20)

1. An aqueous composition (C) for the preparation of aerated concrete or for the preparation of lightweight aggregate concrete, comprising:
-water, which is water,
-at least one aggregate (a) comprising a silica-containing material, said material being at least one molecular weight MW(determined by SEC) of less than 20000g/mol and a Polydispersity Index (PI) of less than 3.5, prepared by radical polymerization in water or a solvent at a temperature equal to or higher than 20 ℃, in the presence of at least one radical-generating compound selected from hydrogen peroxide, ammonium persulfate, tert-butyl hydroperoxide, alkali metal persulfates, said anionic monomer comprising at least one polymerizable ethylenic unsaturation and a carboxylic acid group, said radical-generating compound being optionally associated with a compound selected from FeII、FeIII、CuI、CuIIAnd combinations thereof, optionally in combination with at least one compound selected from the group consisting of sodium bisulfite, potassium bisulfite, ammonium bisulfite, sodium hypophosphite, potassium hypophosphite, ammonium hypophosphite, disodium 2,2' - (thiocarbonyldithio) Dipropionate (DPTTC), and combinations thereof, and
-at least one hydraulic binder (B).
2. The composition according to claim 1, wherein the aggregate (a) comprises at least 10 wt.% silica, preferably wherein the aggregate (a) is a material selected from the group consisting of slag, fly ash, sand, and combinations thereof.
3. The composition according to claim 1 or 2, wherein prior to adding at least one aggregate (a) to the composition, the aggregate (a) is ground, preferably wet-ground, in the presence of at least one polymer (P); the aggregates (A) are preferably ground with a sand mill, roller mill or bead mill; more preferably wherein the aggregate (A) has an average particle size of less than 100 mesh (149 μm) or wherein less than 15% by weight of the particles of aggregate (A) have an average particle size of greater than 200 mesh (74 μm).
4. The composition according to one of claims 1 to 3, wherein the ratio of polymer (P):
having a weight-average molecular weight M of less than 15000g/mol or less than 7500g/mol, preferably less than 6500g/mol, less than 6000g/mol, more preferably less than 5500g/molWOr is or
Having a weight-average molecular weight M of greater than 1000g/mol or greater than 1200g/mol or greater than 1500g/molWOr is or
-having a Polydispersity Index (PI) of less than 3.2 or less than 3, or having a Polydispersity Index (PI) of from 1.5 to 3.5, preferably from 1.5 to 3.2 or from 1.5 to 3.
5. Composition according to one of claims 1 to 4, wherein the anionic monomer (M) is selected from acrylic acid, methacrylic acid, salts of acrylic acid, salts of methacrylic acid and combinations thereof, preferably acrylic acid.
6. The composition according to one of claims 1 to 5, wherein the polymerization is carried out by using:
100% by weight of anionic monomer (M) or
-from 70% to 99.5% by weight of anionic monomer (M) and from 0.5% to 30% by weight of at least one other monomer, preferably chosen from:
a different anionic monomer selected from the group consisting of acrylic acid, methacrylic acid, itaconic acid, maleic acid, salts thereof, and combinations thereof,
nonionic monomers comprising at least one polymerizable ethylenic unsaturation, preferably at least one polymerizable ethylenic unsaturation, in particular a polymerizable vinyl group, more preferably the nonionic monomers are chosen from esters of acids comprising at least one monocarboxylic acid group, in particular from esters of acids chosen from acrylic acid, methacrylic acid and combinations thereof, such as styrene, vinylcaprolactam, alkyl acrylates, in particular C acrylic acid1-C10Alkyl esters, preferably acrylic acid C1-C4Alkyl esters, more preferably propylMethyl enoate, ethyl acrylate, propyl acrylate, isobutyl acrylate, n-butyl acrylate, alkyl methacrylates, especially C-methacrylic acid1-C10Alkyl esters, preferably methacrylic acid C1-C4Alkyl esters, more preferably methyl methacrylate, ethyl methacrylate, propyl methacrylate, isobutyl methacrylate, n-butyl methacrylate, aryl acrylates, preferably phenyl acrylate, benzyl acrylate, phenoxyethyl acrylate, aryl methacrylates, preferably phenyl methacrylate, benzyl methacrylate, phenoxyethyl methacrylate, compounds of formula (I):
R1-(L1)m-(L2)n-R2
(I)
wherein:
■R1represents a polymerizable group selected from the group consisting of acrylate group, methacrylate group, vinyl group, allyl group, methallyl group and isopentenyl group, preferably represents a polymerizable group selected from the group consisting of acrylate group and methacrylate group,
■R2represents an OH group or OCH3The base group is a group of a compound,
■L1and L2The same or different, independently represent an ethylene-oxy group or a propylene-oxy group, and
■ m and n, which are identical or different and at least one of which is not 0, represent a number less than or equal to 150 and their sum m + n is less than 150, and
o2-acrylamido-2-methylpropanesulfonic acid, 2-acrylamido-2-methylpropanesulfonic acid salt, 2- (methacryloyloxy) ethanesulfonic acid salt, sodium methallylsulfonate, sodium vinylsulfonate, sodium 1-allyloxy-2-hydroxypropanesulfonate (CAS #52556-42-0, 7732-18-5, 106-92-3, 106-89-8), allyl ether phosphate, ammonium salts, styrenesulfonic acid salts, and combinations thereof.
7. The composition of any one of claims 1 to 6, wherein the free radical generating compound is selected from the group consisting of hydrogen peroxide, sodium persulfate, potassium persulfate, ammonium persulfate, and combinations thereof.
8. The composition according to one of claims 1 to 7, comprising at least one hydraulic binder (B) selected from the group consisting of cement, Portland cement, aluminous cement, calcium sulfoaluminate cement, cement defined in the EN 197-1 standard (such as CEM I cement, CEMII cement, CEMIII cement, CEM IV cement and CEM V cement), slag, fly ash, gypsum (preferably calcined gypsum or anhydrite) and combinations thereof.
9. The composition according to one of claims 1 to 8, comprising:
from 20% to 45% by weight, preferably from 30% to 40% by weight, in particular 35% by weight, of water,
35 to 70 wt.%, preferably 40 to 60 wt.%, in particular 50 wt.% of ground aggregate (A),
10 to 20% by weight, preferably 10 to 20% by weight, in particular 15% by weight, of a hydraulic binder (B).
10. Composition according to one of claims 1 to 9, comprising at least one further aggregate, preferably selected from sandy soil, quartz sand, gravel, expanded clay, fly ash and combinations thereof.
11. Composition according to one of claims 1 to 10, selected from:
-an aqueous composition (C1) for the preparation of autoclaved aerated concrete, further comprising at least one expanding agent and at least one material selected from lime, lime-containing materials and combinations thereof;
-an aqueous composition (C2) for the preparation of foamed concrete, further comprising a foaming agent or an air-entraining agent, preferably selected from surfactants.
12. The composition (C1) according to claim 11, wherein the expanding agent is a zinc-containing material or an aluminium-containing material, preferably a material selected from free metallic aluminium (more preferably aluminium powder or aluminium paste) and combinations thereof, more preferably free metallic aluminium.
13. The composition (C1) according to claim 11 or 12, comprising
From 20% to 45% by weight, preferably from 20% to 45% by weight, in particular 35% by weight, of water,
35 to 65% by weight, preferably 35 to 65% by weight, in particular 45% by weight, of ground aggregate (A),
10 to 20% by weight, preferably 10 to 20% by weight, in particular 13% by weight, of a hydraulic binder (B),
3 to 9.98% by weight, preferably 4 to 9.97% by weight, in particular 6.96% by weight, of lime-containing material,
from 0.02% to 2% by weight, preferably from 0.03% to 1% by weight, in particular from 0.04% by weight, of an expanding agent.
14. The composition (C2) according to claim 11, wherein the foaming agent is selected from sodium laureth sulfate (sodium lauryl ether sulfate or SLES), sodium lauryl sulfate (sodium lauryl sulfate or SDS), Ammonium Lauryl Sulfate (ALS), sodium salt of alpha-olefin sulfate, sodium lauryl sulfate, ammonium lauryl sulfate, C14-C16-sodium salt of alpha-olefinsulfonic acid, alkyl polyglycol ether sulfate, mixture of aqueous ammonium salt solution and butylene glycol, aqueous solution of anionic and nonionic surfactant, mixture of bissunflower acyl ethyl dimethyl ammonium chloride and sunflower seed oil glyceride, and lauryl lactylate, and combinations thereof.
15. Composition (C1) according to one of claims 11 to 14, comprising
From 20% to 45% by weight, preferably from 20% to 45% by weight, in particular 35% by weight, of water,
35 to 65% by weight, preferably 35 to 65% by weight, in particular 45% by weight, of ground aggregate (A),
10 to 20% by weight, preferably 11 to 20% by weight, in particular 13% by weight, of a hydraulic binder (B),
from 5% to 10% by weight, preferably from 5% to 9% by weight, in particular 7% by weight, of blowing or air-entraining agent.
16. An aerated concrete product or lightweight aggregate concrete product selected from:
-an autoclaved aerated concrete article prepared according to a method comprising:
a-casting at least one composition (C1) according to one of claims 11 to 13,
b-heating and pressurizing the cast composition, preferably in an autoclave reactor, and
-a foamed concrete article prepared according to a process comprising:
a-casting at least one composition (C2) according to one of claims 11, 14 and 15,
b-drying the cast composition.
17. The article according to claim 16, which is selected from the group consisting of blocks (in particular ordinary blocks, round blocks, U-shaped blocks), panels (in particular floor panels, roof panels, wall panels, partitions) and lintels.
18. An aggregate (a) for the preparation of an aerated concrete composition or a lightweight aggregate concrete composition, as defined in one of claims 1 to 15.
19. A process for preparing an aggregate (A) according to claim 18, comprising grinding a material comprising silica in the presence of at least one polymer (P) having a molecular weight MW(determined by SEC) of less than 20000g/mol and a Polydispersity Index (PI) of less than 3, in the presence of at least one compound generating free radicals selected from hydrogen peroxide, ammonium persulphate, tert-butyl hydroperoxide, alkali persulphates, in the presence of at least one compound generating free radicals equal to or higher thanPrepared by free radical polymerization of at least one anionic monomer comprising at least one polymerizable ethylenic unsaturation and a carboxylic acid group, optionally with a compound selected from Fe, in water or a solvent at a temperature of 20 ℃II、FeIII、CuI、CuIIAnd combinations thereof, optionally in combination with at least one compound selected from the group consisting of sodium bisulfite, potassium bisulfite, ammonium bisulfite, sodium hypophosphite, potassium hypophosphite, ammonium hypophosphite, disodium 2,2' - (thiocarbonyldithio) Dipropionate (DPTTC), and combinations thereof.
20. A process for preparing an aqueous composition (C) for preparing aerated concrete or for preparing lightweight aggregate concrete, comprising water, at least one aggregate (A) comprising a silica-containing material and at least one hydraulic binder (B),
wherein the aggregate (A) is at least one molecular weight MW(determined by SEC) of less than 20000g/mol and a Polydispersity Index (PI) of less than 3.5, prepared by radical polymerization in water or a solvent at a temperature equal to or higher than 20 ℃, in the presence of at least one radical-generating compound selected from hydrogen peroxide, ammonium persulfate, tert-butyl hydroperoxide, alkali metal persulfates, said anionic monomer comprising at least one polymerizable ethylenic unsaturation and a carboxylic acid group, said radical-generating compound being optionally associated with a compound selected from FeII、FeIII、CuI、CuIIAnd combinations thereof, optionally in combination with at least one compound selected from the group consisting of sodium bisulfite, potassium bisulfite, ammonium bisulfite, sodium hypophosphite, potassium hypophosphite, ammonium hypophosphite, disodium 2,2' - (thiocarbonyldithio) Dipropionate (DPTTC), and combinations thereof,
and whereby the amount of binder (B) is reduced compared to a similar composition wherein the aggregate (a) is ground in the absence of polymer (P).
CN202010430205.9A 2020-05-20 2020-05-20 Composition for aerated concrete or lightweight aggregate concrete Pending CN113698140A (en)

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PCT/IB2021/000366 WO2021234461A1 (en) 2020-05-20 2021-05-18 Composition for aerated or lightweight concrete

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020091177A1 (en) * 2000-10-25 2002-07-11 Coatex S.A.S. Method for improving the mechanical strength, particularly the strength "at the young ages" of cement matrices, and the cement matrices obtained thereby
US20080293850A1 (en) * 2005-12-02 2008-11-27 Basf Se Use of Comb Polymers as a Grinding Agent for Preparations Containing Cement
EP2371783A1 (en) * 2010-04-01 2011-10-05 Xella Technologie- und Forschungsgesellschaft mbH Porous concrete moulded part and method for its manufacture
CN110088151A (en) * 2016-12-16 2019-08-02 可泰克斯公司 The method of grinding mineral materials

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020091177A1 (en) * 2000-10-25 2002-07-11 Coatex S.A.S. Method for improving the mechanical strength, particularly the strength "at the young ages" of cement matrices, and the cement matrices obtained thereby
US20080293850A1 (en) * 2005-12-02 2008-11-27 Basf Se Use of Comb Polymers as a Grinding Agent for Preparations Containing Cement
EP2371783A1 (en) * 2010-04-01 2011-10-05 Xella Technologie- und Forschungsgesellschaft mbH Porous concrete moulded part and method for its manufacture
CN110088151A (en) * 2016-12-16 2019-08-02 可泰克斯公司 The method of grinding mineral materials

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
刘津明等: "《土木工程施工》", vol. 1, 30 September 2001, 天津大学出版社, pages: 103 *
李铭臻主编: "《新编建筑工程材料》", vol. 1, 31 January 1998, 中国建材工业出版社, pages: 167 - 169 *
贾兴文主编: "《土木工程材料》", vol. 1, 31 August 2017, 重庆大学出版社, pages: 52 *

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