EP3601194A1 - Accélérateur en poudre et composition liante à prise rapide - Google Patents

Accélérateur en poudre et composition liante à prise rapide

Info

Publication number
EP3601194A1
EP3601194A1 EP19700747.9A EP19700747A EP3601194A1 EP 3601194 A1 EP3601194 A1 EP 3601194A1 EP 19700747 A EP19700747 A EP 19700747A EP 3601194 A1 EP3601194 A1 EP 3601194A1
Authority
EP
European Patent Office
Prior art keywords
weight
accelerator
cement
powder
concrete
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP19700747.9A
Other languages
German (de)
English (en)
Inventor
Hauguel LOLITA
Liard MAXIME
Lootens DIDIER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sika Technology AG
Original Assignee
Sika Technology AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sika Technology AG filed Critical Sika Technology AG
Publication of EP3601194A1 publication Critical patent/EP3601194A1/fr
Pending legal-status Critical Current

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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
    • 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
    • C04B40/0042—Powdery mixtures
    • 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
    • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/02—Granular materials, e.g. microballoons
    • C04B14/04—Silica-rich materials; Silicates
    • C04B14/06—Quartz; Sand
    • 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
    • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/02—Granular materials, e.g. microballoons
    • C04B14/26—Carbonates
    • C04B14/28—Carbonates of calcium
    • 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
    • C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
    • C04B22/008—Cement and like inorganic materials added as expanding or shrinkage compensating ingredients in mortar or concrete compositions, the expansion being the result of a recrystallisation
    • 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
    • C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
    • C04B22/06—Oxides, Hydroxides
    • 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
    • C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
    • C04B22/08—Acids or salts thereof
    • C04B22/085—Acids or salts thereof containing nitrogen in the anion, e.g. nitrites
    • 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
    • C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
    • C04B22/08—Acids or salts thereof
    • C04B22/10—Acids or salts thereof containing carbon in the anion
    • 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
    • C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
    • C04B22/08—Acids or salts thereof
    • C04B22/12—Acids or salts thereof containing halogen in the anion
    • 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
    • C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
    • C04B22/08—Acids or salts thereof
    • C04B22/12—Acids or salts thereof containing halogen in the anion
    • C04B22/122—Acids
    • 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
    • C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
    • C04B22/08—Acids or salts thereof
    • C04B22/16—Acids or salts thereof containing phosphorus in the anion, e.g. phosphates
    • 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
    • C04B24/04—Carboxylic acids; Salts, anhydrides or esters thereof
    • C04B24/06—Carboxylic acids; Salts, anhydrides or esters thereof containing hydroxy groups
    • 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
    • C04B24/12—Nitrogen containing compounds organic derivatives of hydrazine
    • C04B24/122—Hydroxy amines
    • 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
    • C04B24/16—Sulfur-containing compounds
    • 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
    • C04B28/04—Portland 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
    • C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
    • C04B2103/10—Accelerators; Activators
    • 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
    • C04B2103/10—Accelerators; Activators
    • C04B2103/12—Set accelerators
    • 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
    • C04B2103/20—Retarders
    • 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
    • C04B2103/20—Retarders
    • C04B2103/22—Set retarders
    • 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
    • C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

Definitions

  • the invention relates to an accelerator powder for cement, compositions containing the accelerator powder, the use of the
  • cement is a mineral binder and is used in large quantities for concrete and mortar. When cement is mixed with water, it hardens in a chemical process called cement hydration. In the cement hydration, which is also called setting of the cement, arise
  • Cement hydrates act in concrete and mortar as a binder for the additives, usually sand, gravel and stones, whereby a solid molding is formed.
  • Cement hydration is an exothermic process whose strength-developing reaction typically begins with delay, often several hours after mixing the cement with water.
  • Cement lead The use of special cements, such as calcium aluminate cement or calcium sulfoaluminate cement, results in mortar or concrete that cures rapidly but has disadvantages in terms of durability. These special cements are often used in combination with accelerators based on lithium salts. However, calcium aluminate cement, calcium sulfoaluminate cement and lithium salts are expensive and not available in large quantities all over the world.
  • No. 8,366,825 describes a fast-curing binder based on cement, calcium nitrite, a formaldehyde derivative and a superplasticizer. The mortars and concretes produced with it show over
  • EP 0 670 292 describes a mixture of a nitrate and / or sulfite component, an alkanolamine component, a thiocyanate component and a carboxylic acid component as setting and hardening accelerator.
  • the beginning of setting in the examples shown is not less than 2 hours and the setting end is not less than 3 hours.
  • US 6,451,105 describes the use of fine limestone powder as accelerator for compositions containing Portland cement. The beginning of setting of the shown mortar mixtures containing the accelerator is between 3 and 6 hours.
  • the object of the invention is to provide a non-toxic, cost-effective and
  • the accelerator powder is mixed with cement, the result is a binder composition which quickly sets after mixing with water and quickly reaches good strengths.
  • the accelerator powder and the mixture of the accelerator powder with cement can be easily and homogeneously mixed with the other constituents of a mortar or concrete and used very well in ready-mixed dry mortar or dry concrete mixtures.
  • Concrete or mortar containing the accelerator powder according to the invention bind quickly to very quickly after mixing with water and reach good strength after a short time. This means that elements can be switched off early, soils can soon be flooded and overcoats applied without long waiting times. In formless concrete or mortar construction, such as the 3D printing, reach the applied
  • mortar and cement paste containing the accelerator powder to accelerate setting show markedly reduced shrinkage compared to prior art accelerators, which is very advantageous as shrinkage often leads to the formation of cracks.
  • the ingredients of the accelerator powder are inexpensive, commercially available worldwide and easy to mix.
  • the accelerator is as a powder very good storage life and can be stored for a long time without problems even after mixing with cement.
  • the invention relates to an accelerator powder for cement comprising:
  • At least one compound V selected from the group consisting of alkali and alkaline earth halides, alkali metal and
  • Alkaline earth nitrates alkali and alkaline earth nitrates, alkali and alkaline earth cyanates and hydroxyalkylamines or their salts, and mixtures thereof.
  • Particle size or “particle size” in this document refers to the diameter of a solid particle.
  • the particle size is in this case generally determined for larger particles, in particular greater than about 0.1 mm, by sieve analysis and for smaller particles, in particular smaller than about 0.1 mm, by means of laserdiffractometry.
  • average particle size D50 in the present document is meant the value of the particle size at which 50% by weight of the particles are smaller than the stated value.
  • water-insoluble powder a powdery material which dissolves in deionized water with a maximum of 1 gram per liter, after stirring for 1 hour at 20 ° C.
  • cementitious composition is meant in the present document a composition containing or consisting of cement.
  • the cementitious composition contains at least 5% by weight % Cement at a maximum of 100% by weight.
  • a cementitious composition are a cement paste, a mortar and a concrete.
  • the combination of the compounds V with the powder P causes a significantly greater acceleration of the setting and / or the strength development of a cementitious composition than the
  • the dosage of the compound V for accelerating a cementitious composition can be significantly reduced by the combination with the powder P, which is economically and ecologically desirable.
  • Composition even within a few minutes, can be achieved.
  • cementitious compositions containing the accelerator powder exhibit significantly less shrinkage, especially within the first 24 hours, than cementitious compositions without the accelerator powder.
  • a reduction in shrinkage is advantageous because fewer cracks occur.
  • the mineral powder P is preferably crystalline. Such powders are particularly effective in blending with compound V.
  • the mineral powder P is preferably selected from the group consisting of calcium carbonate, dolomite, metakaolin and quartz powder, preferably calcium carbonate and dolomite.
  • the mineral powder P comprises or consists to a large extent of calcium carbonate or dolomite.
  • Calcium carbonate powder can be obtained, for example, by grinding limestone, chalk or marble and, depending on the origin of the
  • the calcium carbonate powder comprises at least 90% by weight calcium carbonate.
  • Dolomite powder for example, by grinding dolomite or
  • the dolomite powder comprises at least 90% by weight
  • Dolomite or dolomitic limestone are examples of dolomite or dolomitic limestone.
  • the mineral powder P has an average particle size D50 of 1 to 150 miti, preferably 1.5 to 130 miti on.
  • mineral powders P having an average particle size of 1.1 to 50 miti, in particular 1.2 to 15 miti, preferably 1.3 to 10 miti, or 1.4 to 8 miti.
  • the mineral powder P advantageously has a maximum of 40% by weight, preferably not more than 20% by weight, in particular not more than 10% by weight, in particular not more than 5% by weight, of particles greater than 150 miti, preferably greater than 100 miti, are.
  • the powder P contains at most 30% by weight of particles which are smaller than 1 ⁇ m and / or at most 20% by weight, in particular 10% by weight, of particles which are smaller than 0.5 ⁇ m.
  • the powder P is not nanopowder, that is, the proportion of particles smaller than 1 pm is at most 10% by weight.
  • the compound V comprises an alkali or alkaline earth nitrate, in particular sodium nitrate, an alkali or alkaline earth thiocyanate, in particular sodium thiocyanate, or a hydroxyalkylamine, or mixtures thereof.
  • the hydroxyalkylamine is preferably diethanolamine, triethanolamine, N-methyldiethanolamine, N-ethyldiethanolamine, tris (hydroxymethyl) aminomethane, diisopropanolamine, triisopropanolamine, methyldiisopropanolamine, or their salt.
  • the compound V comprises at least one hydroxyalkylamine, in particular diethanolamine, triethanolamine or N-methyldiethanolamine, preferably N-methyldiethanolamine.
  • compound V comprises at least 10% by weight of a hydroxyalkylamine, based on the total weight of compound V.
  • a quick setting start and a fast setting end are especially advantageous, especially for a mortar for 3D printing.
  • the reduction of shrinkage is especially pronounced when the accelerator powder comprises as compound V at least one hydroxyalkylamine, in particular N-methyldiethanolamine.
  • the hydroxyalkylamine is partially or completely neutralized with an inorganic or organic acid.
  • the acid is an organic acid, preferably formic acid, acetic acid, citric acid, lactic acid, tartaric acid or gluconic acid. This is advantageous for the simple and safe production and storage of the accelerator and a possibly unpleasant odor of the
  • Accelerator powder can be reduced.
  • the accelerator powder comprises at least two, in particular at least three, different
  • At least three compounds V in particular of an alkali metal nitrate or alkaline earth metal nitrate, an alkali thiocyanate or Erdalkalithioycyanat and a hydroxyalkylamine.
  • the combination of the powder P with two or three compounds V shows a surprisingly strong accelerating effect on the setting of cement even at low dosage of the compound V.
  • the accelerator powder advantageously comprises 50 to 99.7% by weight, preferably 75 to 99.5% by weight, in particular 80 to 99% by weight, powder P and 0.3 to 50% by weight, preferably 0.5 to 25% by weight, in particular 1 to 20% by weight -%, at least one compound V, relative to 100
  • Such a ratio of powder P to the sum of the compounds V gives good acceleration at a low cost. It is advantageous if, at the same time as the accelerator powder, an effective flow agent is added to the cementitious composition, in particular the flow agent is present in the accelerator powder.
  • Suitable flow agents are the usual flow agents in mortar and concrete technology. These are known to the person skilled in the art.
  • polycarboxylate ethers are polycarboxylate ethers.
  • the polycarboxylate ether is a comb polymer comprising a polycarboxylate backbone having attached thereto polyalkylene oxide side chains, especially polyethylene oxide side chains.
  • the side chains are bound to the polycarboxylate backbone, in particular via ester, ether, imide and / or amide groups.
  • Corresponding comb polymers are also sold commercially by Sika für AG under the Flandelsnamensch Sika ® ViscoCrete ® .
  • the accelerator powder preferably also comprises a flow agent, in particular a polycarboxylate ether, preferably in 0.3 to 10% by weight, in particular 0.4 to 8% by weight, in particular 0.5 to 7% by weight, calculated as dry flow agent, based on 100% by weight %
  • the accelerator powder also comprises a retarder, preferably a flydroxycarboxylic acid, in particular tartaric acid, citric acid or gluconic acid, or its salt, a sugar, in particular sucrose, a phosphate or a phosphonate, or its salt, or mixtures thereof.
  • a retarder preferably a flydroxycarboxylic acid, in particular tartaric acid, citric acid or gluconic acid, or its salt, a sugar, in particular sucrose, a phosphate or a phosphonate, or its salt, or mixtures thereof.
  • retarder is tartaric acid or its alkali metal salt.
  • the accelerator powder comprises 0.1 to 10% by weight, preferably 0.5 to 8% by weight, more preferably 0.8 to 7% by weight, of a retarder, based on 100% by weight of the accelerator powder.
  • the retarder if it is an acid, can be used for complete or partial neutralization of the hydroxyalkylamine.
  • the setting initiation of the cementitious composition can be selectively controlled. Thereby, the processing time and the strength development of the cementitious composition can be adjusted for the desired application. This allows a large scope for the
  • this allows a processing time in the range of, for example, 5 minutes to 60 minutes set and still achieve a rapid strength development.
  • mineral powder in particular calcium carbonate with a mean particle size D50 in the range of 1 to 150 miti
  • Such an accelerator powder causes a rapid setting start and a rapid setting end of cement or cement-containing mixtures, in particular of concrete and mortar mixtures.
  • the use of such an accelerator powder for the acceleration of concrete and mortar mixtures for 3D printing is particularly advantageous.
  • the accelerator is present as a free-flowing powder. This can easily be mixed with cement or cementitious mixtures.
  • the accelerator powder is prepared by mixing the components.
  • Component such as the hydroxyalkylamine or an aqueous solution of the flow agent, sprayed onto the mineral powder P.
  • the mineral powder P before the application of the liquid component or only thereafter, be mixed with possibly further existing powder components. Suitable methods for mixing powders or powders with liquids are known to those skilled in the art.
  • introduced water or solvent can be removed from the powder by suitable methods.
  • the accelerator powder is processed with water to form an aqueous suspension, and this is used to accelerate cementitious compositions.
  • the accelerator suspension can be easily dosed without dusting and can be added together with the mixing water or shortly before, or after the mixing water, a concrete or mortar mixture.
  • Another object of the invention is a fast-setting binder composition
  • a fast-setting binder composition comprising 10 to 95% by weight of cement and 5 to 90% by weight of accelerator powder, as described above, based on 100% by weight of the binder composition.
  • the fast-setting binder composition comprises 50 to 94% by weight, preferably 60 to 92% by weight, in particular 65 to 90% by weight of cement and 6 to 50% by weight, preferably 8 to 40% by weight, in particular 10 to 35% by weight -%, accelerator powder, as previously described.
  • accelerator powder as previously described.
  • Such a ratio of accelerator powder to cement causes a particularly good acceleration of the binding of the binder composition.
  • the cement represents a cement according to DIN EN 197-1, in particular Portland cement (CEM I), Portland composite cement (CEM II), blast-furnace cement (CEM III), pozzolanic cement (CEM IV) and composite cement (CEM V). which are produced according to an alternative standard, such as the ASTM standard, the Japanese standard JIS or the Indian standard, are equally suitable.
  • CEM I Portland cement
  • CEM II Portland composite cement
  • CEM III blast-furnace cement
  • CEM IV pozzolanic cement
  • CEM V composite cement
  • the cement is particularly advantageously Portland cement, preferably a CEM I 42.5 or 52.5, in particular CEM I 52.5.
  • a cement of the type CEM I in particular CEM I 52.5, is particularly advantageous for a rapid setting of the binder composition.
  • the fast includes
  • binding binder composition still 0.5 to 6, preferably 0.8 to 5, more preferably 1 to 4 weight% calcium sulfate, preferably in the form of calcium sulfate hemihydrate, based on 100% by weight of the fast
  • Dosage increases the early strength without affecting the rapid onset of setting.
  • the fast-setting binder composition is prepared by simply homogeneously mixing the components.
  • the binder composition according to the invention when mixed with water, is particularly fast cures, that is, a fast Abbindebeginn and a fast setting end has when the viscosity of the freshly prepared aqueous binder composition has a value between 0.8 and 100 Pa s, preferably 1 to 50 Pa-s, at a shear rate of 10 s -1 .
  • the viscosity of the binder composition mixed with water is determined here using a Physica MCR 301 rheometer (manufacturer Anton Paar, Austria) with the Rheoplus software.
  • the rheometer is calibrated with a calibration mortar SRM 2493, available from NIST, USA.
  • a steel cup having serrated ribs and having a dimension of 80 mm in height and 43 mm in diameter, and a spindle in the form of a spiral double helix having a height of 50 mm and a diameter of 35 mm are used.
  • the viscosity of the fast-setting binder composition can be advantageously adjusted by the amount of water and / or the content of powder P.
  • the W / Z (the weight ratio of water to cement) is advantageously low, preferably below 0.40, in particular below 0.35, in particular below 0.30 or below 0.28.
  • Another object of the invention is a concrete or mortar containing the accelerator powder, as described above, wherein the accelerator nigerpulver preferably in 6 to 100% by weight, especially 8 to 67
  • % By weight, in particular 10 to 54% by weight, based on the weight of the cement contained in the concrete or mortar.
  • the cement in the concrete or mortar is a Portland cement of the type CEM I 42.5 or 52.5, in particular CEM I 52.5, according to DIN EN 196-1.
  • the accelerator powder is here mixed in the mortar or concrete.
  • the concrete or mortar comprising the accelerator powder can in this case be produced in particular by mixing the accelerator powder with a dry or aqueous concrete or mortar mixture.
  • fast-setting binder composition comprising the accelerator powder and cement, as described above, with sand and optionally further additives in order to obtain a fast-setting concrete or mortar mixture.
  • the mineral powder P and the compound V and optionally the liquefier and / or the retarder without premix can be added directly in the preparation of a dry mortar or dry concrete in the advantageous amounts.
  • the accelerator powder or fast-setting binder composition is provided in a masterbatch before being mixed with the remaining components to form a fast-setting concrete or mortar.
  • the premixes allow more accurate metering of the powder P and compound V and better mixing of all components. This allows a well-matched to the application concrete or mortar of high quality
  • the concrete or mortar may contain at least one further additive, in particular a defoamer, a wetting agent, a dye
  • Preservative a flow agent, a retarder, further accelerators, a polymer, an air entraining agent, a rheology aid, a viscosity modifier, a Schwrimduzierer or a corrosion inhibitor or combinations thereof.
  • the dry concrete or mortar mixtures containing the accelerator powder have good storage stability and form, mixed with water, a fast-curing concrete or mortar.
  • flow agent in particular a polycarboxylate ether, based on the weight of the cement
  • retarder in particular tartaric acid or a salt thereof, based on the weight of the cement
  • Another object of the invention is the use of the accelerator to accelerate a concrete or mortar mixture, wherein the concrete or mortar mixture after mixing with a water
  • Start setting under 90 minutes preferably less than 60 minutes, in particular less than 30 minutes, and a setting end less than 3 hours, preferably less than 2 hours, in particular less than 90 minutes, measured with an automatic Vicat needle device according to DIN EN 196-3 at 20 ° C. , having.
  • the accelerator powder is used to accelerate an aqueous concrete or mortar mixture, wherein the concrete or mortar mixture is so composed that the accelerator powder containing concrete or mortar mixture immediately after mixing with water has a viscosity of 1 to 100 Pa s, preferably from 3 to 50 Pa s, at a shear rate of 10 s 1 , wherein the viscosity of a concrete or mortar sample with a maximum particle size of 2 mm, obtained in particular by sieving the aqueous concrete or mortar mixture, with a rheometer as described above, is determined.
  • the acceleration effect is particularly pronounced when the aqueous concrete or mortar mixture has a viscosity in the preferred range.
  • the viscosity is advantageously adjusted by an optimized composition of the concrete or mortar.
  • the viscosity can be adjusted by the amount of water, the amount and fineness of the powder P, as well as the amount and type of cement.
  • the W / C of the concrete or mortar mixture is preferably below 0.45, more preferably below 0.43, in particular below 0.40, in particular it is 0.39 or below.
  • a reduction of the shrinkage is advantageous because in the hardened shaped body, the predetermined dimensions remain as unchanged as possible and less cracks occur.
  • the accelerator powder as compound V comprises at least one hydroxyalkylamine, in particular N-methyldiethanolamine.
  • the accelerator powder for quick-setting mortar in particular for a grout, a repair mortar, a grout, in particular for a floor, a tile mortar, a waterproof mortar or a mortar for 3D printing.
  • 3D printing is a non-forming molding process in which the mortar is applied in several layers and, if necessary, also adjacent layers or in smaller portions, creating a three-dimensional object.
  • the structure is done
  • the setting onset is in the range of 1 to 30 minutes, in particular 2 to 16 minutes. It is also advantageous if the setting end is less than 90 minutes, in particular less than 40 minutes. This ensures sufficient time for the application and at the same time rapid production speed.
  • the invention further relates to a shaped body produced from a concrete or mortar mixture containing the accelerator powder as before described after mixing with water and curing the mixture thus obtained.
  • Omyalite ® 90 is a fine calcium carbonate powder with a mean particle size D50 of 1.5 miti, available from Omya, Switzerland.
  • Nekafill ® 15 is a fine calcium carbonate powder available from Kalkfabrik Netstal, Switzerland.
  • RW Filler is uncompacted microsilica (amorphous S1O2), available from RW Silicium GmbH, Germany. 2. Composition and Preparation of Accelerator Powders and Binder Compositions
  • Accelerator Powder B2 (Comparative Mix)
  • Accelerator Powder B3 (Comparative Mix)
  • Accelerator powder B4 (according to the invention) 10 g Omyalite ® 90 were mixed with 0.2 g of N-methyldiethanolamine.
  • Omyalite ® 90 10 g Omyalite ® 90 were mixed with 0.25g of sodium nitrate, 0.14g sodium thiocyanate, 0:11 g of N-methyldiethanolamine and 0.7 g Sika ViscoCrete®-225 P.
  • Nekafill ® 15 10 g Nekafill ® 15 were mixed with 0.25g of sodium nitrate, 0.14g sodium thiocyanate, 0:11 g of N-methyldiethanolamine and 0.7 g Sika ViscoCrete®-225 P.
  • Beschleuniqerpulver B9 (erfindunqsqezess) 20 g Omyalite ® 90 were mixed with 0.2 g of sodium nitrate and 0.8 g of sodium thiocyanate.
  • RW filler 5 q of RW filler were mixed with 1.0 g of sodium nitrate, 0.2 g of sodium thiocyanate and 0.1 g of N-methyldiethanolamine.
  • Accelerator powder B12 (according to the invention)
  • Omyalite ® 90 10 g Omyalite ® 90 were mixed with 1.0 g of sodium nitrate, 0.2 g of sodium thiocyanate, 0.1 g of N-methyldiethanolamine and 0.05g of tartaric acid.
  • Accelerator powder B13 10 g Omyalite ® 90 were mixed with 1.0 g of sodium nitrate, 0.2 g of sodium thiocyanate and 0.1 g of triethanolamine.
  • M2 and M3 were prepared as M1, but 0.2 g was added to accelerator powder B8 and 0.4 g of tartaric acid to M3.
  • the setting time is understood in this document to mean the time interval between the end of the mixing and the beginning or end of the setting.
  • the compressive strength was determined on test specimens of 40 ⁇ 40 ⁇ 160 mm according to DIN EN 196-1. Until the test, the specimens were stored in the form covered at 20 ° C.
  • composition of the cement pastes and the measured setting times and compressive strengths after 2 hours are given in Table 1 and Table 2.
  • nm not measurable, the setting begins already during mixing.
  • Binder compositions M1, M2 and M3 were blended in the amounts shown in Table 2 (KitchenAid model ARTISAN,

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Civil Engineering (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

La présente invention concerne un accélérateur en poudre pour ciment et des compositions liantes à prise rapide contenant cet accélérateur en poudre et l'utilisation dans du mortier ou du béton. L'accélérateur en poudre comprend 10 à 99,7 % en poids d'une poudre minérale P non hydrosoluble et 0,3 à 90 % en poids d'au moins un composé V, choisi dans le groupe constitué d'halogénures alcalins et d'halogénures alcalino-terreux, de nitrates alcalins et de nitrates alcalino-terreux, de nitrites alcalins et de nitrites alcalino-terreux, de cyanates alcalins et de cyanates alcalino-terreux ainsi que d'hydroxyalkylamines ou leurs sels et des mélanges de ceux-ci.
EP19700747.9A 2018-01-24 2019-01-22 Accélérateur en poudre et composition liante à prise rapide Pending EP3601194A1 (fr)

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PCT/EP2019/051414 WO2019145267A1 (fr) 2018-01-24 2019-01-22 Accélérateur en poudre et composition liante à prise rapide

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CN (1) CN111630021A (fr)
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BR (1) BR112020014756A2 (fr)
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EP4397640A1 (fr) * 2022-09-07 2024-07-10 Fibrobeton Yapi Elemanlari Sanayi Insaat Ve Ticaret Anonim Sirketi Mélange de béton à résistance ultra-épartique

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US11780783B2 (en) 2023-10-10
KR20200113210A (ko) 2020-10-06
BR112020014756A2 (pt) 2020-12-08
SG11202006761RA (en) 2020-08-28
AU2019212107A1 (en) 2020-07-23
WO2019145267A1 (fr) 2019-08-01
CN111630021A (zh) 2020-09-04
US20210032170A1 (en) 2021-02-04
US11565978B2 (en) 2023-01-31

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