EP3271307A1 - Mélange retardateur pour liants activés par alcali - Google Patents

Mélange retardateur pour liants activés par alcali

Info

Publication number
EP3271307A1
EP3271307A1 EP16714757.8A EP16714757A EP3271307A1 EP 3271307 A1 EP3271307 A1 EP 3271307A1 EP 16714757 A EP16714757 A EP 16714757A EP 3271307 A1 EP3271307 A1 EP 3271307A1
Authority
EP
European Patent Office
Prior art keywords
alkali
mixture
binder
retarder
activated
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.)
Withdrawn
Application number
EP16714757.8A
Other languages
German (de)
English (en)
Inventor
Peter Blaum
Frank Bullerjahn
Maciej Zajac
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.)
Heidelberg Materials AG
Original Assignee
HeidelbergCement 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 HeidelbergCement AG filed Critical HeidelbergCement AG
Publication of EP3271307A1 publication Critical patent/EP3271307A1/fr
Withdrawn legal-status Critical Current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
    • 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
    • C04B22/106—Bicarbonates
    • 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
    • C04B28/006—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 mineral polymers, e.g. geopolymers of the Davidovits type
    • 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
    • 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
    • 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
    • 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
    • C04B28/18—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 mixtures of the silica-lime type
    • 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
    • C04B28/24—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 alkyl, ammonium or metal silicates; containing silica sols
    • C04B28/26—Silicates of the alkali metals
    • 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
    • C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
    • 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
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/10—Compositions or ingredients thereof characterised by the absence or the very low content of a specific material
    • C04B2111/1062—Halogen free or very low halogen-content materials
    • 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
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/20—Resistance against chemical, physical or biological attack
    • C04B2111/21—Efflorescence resistance
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
    • 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 present invention relates to retardant mixtures which retard the solidification and / or hardening of alkali-activated inorganic binders, in particular of geopolymers.
  • geopolymer inorganic binders are referred to, which can be made analogous to classic Portland cement to a flowable paste and then harden to solid structures.
  • the hardening of classical zeolite-like structure-forming geopolymers is achieved by a reaction of silicate with aluminate under strongly alkaline conditions. Typically, these conditions may be provided by a combination of alkali hydroxide solution and alkali silicate solution to yield an aqueous binder system.
  • a dry binder system can be created using a solid activator, such as solid alkali silicate.
  • the result of the geopolymer's reaction is an amorphous, three-dimensional network of silicon and aluminum atoms, which are cross-linked by oxygen atoms to form a polymeric structure.
  • forming geopolymers are used raw materials that provide silicates and aluminates in an appropriate amount.
  • mineral raw materials e.g. Metakaolin
  • synthetic materials such as industrial
  • By-products eg silicon-rich fly ash
  • the use of industrial by-products is preferable to the use of mineral resources in economic and environmental terms. More recently, the range of raw materials / industrial by-products used to make the aforesaid type of binder has been successively expanded.
  • silicon-rich fly ash in particular latent hydraulic and / or pozzolanic effective calcium rich fly ash and slag sands / slags used.
  • the reactivity of the raw materials significantly influences the performance of the geopolymer binder produced and is determined by the following properties of the raw materials:
  • a high volume fraction of glass phase is advantageous for the reactivity of the binder, since the glass phase has a high solubility.
  • the reactivity is determined by the chemical composition: the higher the CaO content, the higher the reactivity.
  • materials with high free lime content should be avoided, as free lime can cause a lightning strike.
  • Carbon compounds in the form of unburned carbon particles increase the need for activator and water demand due to their large internal surface area, which degrades binder performance and increases costs.
  • the reactive surface is another important factor, the higher the reactive surface the more soluble the raw material. Therefore, the use of ground aluminosilicate-containing raw materials is advantageous, resulting in
  • the activator should provide a high pH in order to dissolve the raw materials used of glassy-crystalline nature (e.g., fly ash, blastfurnace sands, etc.).
  • the chemical bonds in the present aluminosilicate, calcium silicate, calcium aluminosilicate, calcium aluminate, Caiciumferrit- and CalciumaluminoferritENSen be broken, and the liberated mono- and polymer fragments fed to the pore solution.
  • the activator adds silicon and alumina compounds which promote the formation of the geopolymer network. As activator for
  • Geopolymers are suitable for various substances:
  • alkali / alkaline earth silicates e.g. Sodium or potassium silicate, sodium metasilicate both anhydrous and as pentahydrate
  • alkali / alkaline earth hydroxides e.g. Sodium hydroxide, calcium hydroxide,
  • alkali / alkaline earth carbonates e.g. sodium
  • alkali / alkaline earth sulfates e.g. Sodium sulfate, potassium sulfate
  • the alkaline activator can be added as a liquid or solid component.
  • the activator is preferably milled with the latent hydraulic and / or pozzolanic binder components to increase reactivity.
  • the co-grinding can be initiated during the current grinding process of the aforementioned latent-hydraulic and / or pozzolanic effective binder components. If these are already present in ground or sufficiently fine form, an additional grinding step can be carried out in order to be able to guarantee an adequately homogeneous distribution of the activator, or uniform wetting of the reactive surfaces of the raw material. Liquid activator components tend to carbonate so they must be stored completely. Depending on the activator component different pH values are achieved, the following Table 2 gives an overview.
  • the hardening of geopolymers can be divided into three phases.
  • silicates, aluminates and ferrites are liberated by breaking the chemical bonds from the present glassy-crystalline binder components / raw materials. This is initiated by hydroxide ions from the activator. This monomolecular and condensed fragments in brought the pore solution.
  • the release requires very strong alkalis or weakly alkaline ones
  • Substances are enough. Strong activators are needed, in particular, for geopolymers, which are predominantly aluminosilicate, ie, network-forming aluminas and silicas, since there are many covalent bonds. If the aluminosilicate structures are modified by a substantial content of foreign ions such as Ca 2+ , Mg 2+ , Na + , K + in the glass phase, there are many ionic bonds which can also be broken by weaker activators. Silicon-rich flyashes therefore require strong activators, such as alkali hydroxides and alkali silicates, for lime-rich fly ash and granulated blast furnace slag, weaker activators such as carbonates often suffice.
  • the condensation takes place, in which the solid three-dimensional network of aluminosilicates is formed.
  • mono- and polysilicate anions from the activator the reorganization of the aluminosilicate fragments from the geopolymer to solid structures with a higher
  • the presence of calcium not only contributes to the mechanical strength of the cured binder system by the formation of CSH and CASH but also by the acceleration of Geopolymererhärtung.
  • the reaction of the geopolymers can also be accelerated by heating up to 90 ° C.
  • composition of the geopolymer binder must be selected from the composition of the geopolymer binder.
  • the most important parameters are the CaO content, the activator content and the SiO 2 / Na 2 O ratio in the activator.
  • the water / binder value and the hardening temperature exert an important influence.
  • Silicon-rich fly ash with a low content of CaO typically ⁇ 10 wt .-%, give classic geopolymer binder, which harden substantially only by formation of aluminosilicate networks (zeolites). Here strongly alkaline activators are used.
  • CaO content e.g. increases in the use of latent-hydraulically effective calcium-rich fly ash or slag sands to> 10%, comes in the hardening to
  • For geopolymers with a low CaO content ⁇ 10% are usually 12- 17% activator, a SiO 2 / Na 2 O ratio in the activator of 0.75 to 1, 0 and a water-binder value of about 0.35 usable.
  • the CaO content also strongly affects the open time of the binder. As the CaO content increases, the open time decreases so much that processing is no longer possible. Delaying additives are therefore necessary for such geopolymer binders.
  • Geopolymers with CaO contents in the lower range of ⁇ 10% tend to be larger Amounts of activator, with a CaO content of> 10 wt .-% are usually optimal strengths with lower levels of activator.
  • a problem is that often high strength is associated with poor processability in the sense of a very short open time. Both properties can be influenced by the amount and type of activator, but the requirements are opposite. Unlike in Portland cement systems, increasing the W / B usually does not result in longer processability. Therefore, a delaying additive is needed.
  • additives are meant here those substances which are added to the targeted change / adjustment of properties of the binder during processing or the hardened system.
  • Additives are concrete additives according to DIN EN 934 and those with building inspectorate approval, for example: concrete liquefiers, superplasticizers, air entraining agents,
  • Sealants, retarders, solidification accelerators, hardening accelerators, stabilizers, etc. do not include the activators, although these are used as additives in OPC-based systems, the activators are part of the binder in the geopolymers.
  • additives are to be distinguished from the additives which are used in concrete in order to specifically improve or achieve properties such as minerals (fillers), pigments, fibers, etc.
  • additives are organic substances which are preferentially bound to the dominant surface areas of the non-reactive carbon particles. It must also be ensured that an effect is not due to effects such as air entrapment. Many organic additives also act as air entrainers and can be removed by the introduction of air bubbles e.g. simulate a liquefying effect. Particularly difficult is the very high pH of the binders which renders many of the additives useful in OPC ineffective, e.g. by being decomposed.
  • Sodium gluconate and alkali bicarbonate reliably increases the open time for alkali-activated binders without any significant loss in strength or significant deterioration in strength development.
  • the above object is therefore achieved by a retarder mixture comprising sodium gluconate and alkali metal bicarbonate, by an alkali-activated binder containing sodium gluconate and alkali metal bicarbonate, and by a method for adjusting the solidification behavior, are added to the sodium gluconate and alkali metal bicarbonate an alkali-activated binder.
  • alkali-activated binders are to be understood as meaning both classical geopolymers and mixtures comprising aluminosilicates or aluminates and silicates and / or calcium (alumino) silicates in combination with an activator and at least also by the formation of Three-dimensional cross-linked aluminosilicate polymers, calcium silicate hydrates (CSH), calcium aluminate silicate hydrates (CASH), metal-metal hydroxides (eg representatives of the hydrotalcite group) and Ca-Metallhydroxisalzen (eg representatives of Calciumaluminathydrate) harden.
  • CSH calcium silicate hydrates
  • CASH calcium aluminate silicate hydrates
  • metal-metal hydroxides eg representatives of the hydrotalcite group
  • Ca-Metallhydroxisalzen eg representatives of Calciumaluminathydrate
  • Alkali-activated binders with low CaO contents mean CaO contents of up to 10% by weight, based on the total content of reactive CaO in the underlying binder system, alkali-activated binders with medium to high CaO contents are those with> 10% by weight CaO , preferably> 15 wt .-% and more CaO.
  • raw materials for the production of alkali-activated binders are preferably fly ash, which can be both rich in limestone and silicate, used slag sands and slags.
  • fly ash which can be both rich in limestone and silicate, used slag sands and slags.
  • mixtures are used so that a desired content of aluminum oxide, silicon dioxide and other parameters such as the ratio Si / Al, (Si + Al) / Ca, etc. is obtained.
  • the raw materials can be pretreated, for example, to remove carbon and other organic components. There may also be a thermal or hydrothermal treatment using e.g. a
  • TIPA triisopropanolamine
  • TAA triethanolamine
  • activator known substances are used. These are, as described above, especially silicates, hydroxides, carbonates, sulfates and Portland cement or Portland cement clinker and corresponding combinations of the aforementioned activators.
  • the silicates used are preferably sodium silicate, potassium silicate, anhydrous sodium metasilicate and sodium metasilicate pentahydrate.
  • Suitable hydroxides are alkali metal and alkaline earth metal hydroxides and oxides which react on contact with water to form hydroxides. Particularly preferred are sodium, potassium and calcium hydroxide.
  • the carbonate used is preferably sodium carbonate.
  • Suitable sulfates are sodium sulfate and potassium sulfate.
  • Portland cement or Portland cement clinker may also be used in the form of waste fractions from the production of Portland cement, such as process meals and dusts.
  • activator or activators is adjusted in a conventional manner to the latent-hydraulic and / or pozzolanic effective binder components / raw materials. Usual amounts are in the range of 10 to 20 wt .-% based on the solids content of the binder. It should be noted that in the case of Portland cement (clinker) as activator, in contrast to Portland Kompositzement and Portlandpuzzolanzement less Portland cement (clinker) is used.
  • dry activators can be advantageous in one
  • Milling be mixed or are milled separately.
  • Dissolved activators are conveniently added with the mixing water, but may also be added before or after this.
  • binder refers to the sum of the aluminosilicates, aluminates, silicates and the solids content of the activators;
  • Activator bound water also, if necessary, to release the activator and / or of Adding added water introduced.
  • W / B are useful in the range of 0.2 to 0.5, especially 0.3 to 0.45, especially 0.35 to 0.40.
  • the fineness of Blaine's solid binder components is typically in the range of 3000 to 5000 cm 2 / g, more preferably about 4000 cm 2 / g. A higher fineness leads to increased reactivity up to a certain limit, but also requires a higher grinding energy and more water, so that a useful compromise is chosen in a manner known per se for the particular binder and its application.
  • the binder for adjusting the open time and thus ensuring a usable processability, the inventive
  • Retarder mixture comprising sodium gluconate and alkali metal bicarbonate.
  • the alkali metal bicarbonate used is preferably sodium or potassium bicarbonate.
  • the amount is preferably in the range of 0.1 to 0 wt .-% based on the binder, more preferably from 0.5 to 5 wt .-% and most preferably from 1 to 3 wt .-%.
  • the ratio of sodium gluconate to alkali metal bicarbonate is preferably in the range from 9: 1 to 1: 4, preferably from about 3: 1 to 1: 1.
  • the retarder mixture may be retarders based on lignosulfonates, sulfonated naphthalene, melamine or phenol-formaldehyde condensate, or based on acrylic acid-acrylamide or polycarboxylate or based on phosphated polycondensates; based on phosphated alkylcarboxylic acids and salts thereof, based on (hydroxy) carboxylic acids and carboxylates, in particular citric acid, citrates, tartaric acid, tartrates, borax, boric acid and borates, oxalates, sulphanilic acid, Aminocarboxylic acids, salicylic acid and acetylsalicylic acid, dialdehydes and mixtures thereof.
  • the retarder mixture according to the invention can be used in the preferred metering and mixing ratio both in dissolved and solid form as a component of the binder or concrete admixture.
  • the retardant mixture according to the invention is here preferably admixed in solid form to the binder as further component or cover-milling in the context of required grinding processes with binder components.
  • the retarder mixture according to the invention can be used both in dissolved and solid form in the preferred metering and mixing ratio. In dissolved form here is the
  • Retarder mixture preferably added to the mixing water.
  • the time is here freely selectable, but preferably takes place during the mixing process of binder, aggregate and mixing water.
  • the addition is preferably carried out in a manner such that a homogeneous distribution of the additive in the concrete mixture is ensured; This can be done in individual dosing steps or as a continuous process during the period of addition of the mixing water.
  • the retardant mixture according to the invention is preferably added after addition of the binder components.
  • the retarder mixture according to the invention retards the solidification of alkali-activated binder systems, in particular of geopolymers, which have average to high CaO contents based on the solids content of the binder, and in particular in pH ranges above the efficacy limit of known additives.
  • the delay in the solidification of the binder in concrete and cement mortar leads to a significant extension of
  • the retarder system is free of chlorides and does not cause efflorescence. It is suitable as retarding retarder for construction site, transport and pumping concrete, for screed and cement mortar as well as for large monolithic components (eg Precast applications).
  • the invention is particularly advantageous for binders with a high CaO content and strongly alkaline activators.
  • the retarder invention significantly increases the open time without compromising the compressive strength. In some cases, the compressive strength even increases. Of particular advantage is that the effect increases at higher pH values. In addition, there is a
  • the invention also relates to all combinations of preferred embodiments, as far as they are not mutually exclusive.
  • the information "about” or “approx.” in conjunction with a numerical indication, means that at least 10% higher or lower values or 5% higher or lower values and in any case 1% higher or lower values are included.
  • An alkali-activated binder comprising 64% by weight of fly ash 1, 21% by weight of granulated slag 1 and 15% by weight of activator, based on the solids content of the binder, was prepared by mixing the abovementioned components.
  • the SiO 2 / Na 2 O ratio in the activator solution consisting of 40% NaOH Solution and a commercial water glass from PQ (product name:
  • fly ash 1 was ground to a fineness of 2850 cm 2 / g, granulated slag 1 to a fineness of 4920 cm 2 / g.
  • the chemical composition of fly ash 1 and granulated slag 1 is given in Table 3.
  • For the binder system results in a CaO content of about 15.1 wt .-% based on the solids content of the binder.
  • Retarder have been proposed, and added the retarder according to the invention in an amount of 4%.
  • Digit system judged The assessment of consolidation is based on an empirically developed system of 6 digits in total.
  • the numbers 0-3 describe the behavior of the sample before hardening, up to a solidification, which is approximately in the range of the solidification end according to DIN 1164.
  • the numbers 4-6 describe the subsequent hardening behavior.
  • Paragraph 6 generally indicates a mortar compressive strength in the range of 4 MPa.
  • the figuring of the observed effects contains a subjective, personal component, but experience has shown that it becomes quite even with increasing practice. The numbering allows the comparison of samples by
  • the representation in curves represents an additional plausibility check.
  • the method is particularly suitable for the relative assessment of solidification processes before and during the
  • Example 1 The binder of Example 1 and an analogous binder with fly ash 2 were mixed with 1% of different retarders and as in Example 1 determines the time to noticeable stiffening of the glue samples.
  • mortar prisms were prepared as described in [00019] and additionally the compressive strength after 28 days (storage at 20 ° C, 100% rel.
  • fly ash 1 which is a binder with a CaO content of approx.
  • the binder with fly ash 2 had a high CaO content of about
  • Additives according to the invention a useful open time and a high
  • FIG. 1 a shows the slump dimension measured on mortar samples in accordance with DIN / EN 015-3
  • FIG. 1 b shows the compressive strength measured on mortar samples according to DIN / EN 1015-11.
  • the chemical composition of fly ash 3 and granulated slag 2 is given in Table 3.
  • the W / B was set at 0.40 for all mortar mixtures
  • fly ash 3 was ground to a fineness of 4360 cm 2 / g, blast furnace slag 2 to a fineness of 4450 cm 2 /G.
  • the slump decreases significantly in mortar samples with significantly increased CaO content> 10.0 wt .-% after 30 - 45 min, along with a significant stiffening of the samples.
  • the open time decreases so much that processing is no longer possible. Delaying additives are therefore necessary for such geopolymer binders.
  • FIG. 1 b illustrates the ambivalent character of variable CaO contents already described in [00020].

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
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  • General Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Life Sciences & Earth Sciences (AREA)
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  • Curing Cements, Concrete, And Artificial Stone (AREA)
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Abstract

L'invention concerne un mélange retardateur comprenant du gluconate de sodium et du carbone d'hydrogène alcalin, un liant activé par alcali contenant du gluconate de sodium et du carbonate d'hydrogène alcalin, ainsi qu'un procédé pour ajuster le développement de la résistance, procédé selon lequel du gluconate de sodium et du carbonate d'hydrogène alcalin sont ajoutés à un liant activé par alcali.
EP16714757.8A 2015-03-17 2016-03-14 Mélange retardateur pour liants activés par alcali Withdrawn EP3271307A1 (fr)

Applications Claiming Priority (2)

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EP15000784.7A EP3070065A1 (fr) 2015-03-17 2015-03-17 Mélange inhibiteur pour un liant à activité alcaline
PCT/EP2016/000452 WO2016146251A1 (fr) 2015-03-17 2016-03-14 Mélange retardateur pour liants activés par alcali

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EP3271307A1 true EP3271307A1 (fr) 2018-01-24

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CN (1) CN107428612A (fr)
AU (1) AU2016232648A1 (fr)
CA (1) CA2979434A1 (fr)
EA (1) EA201792026A1 (fr)
MA (1) MA41783A (fr)
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WO2019110134A1 (fr) 2017-12-08 2019-06-13 Ecocem Materials Limited Liant à base de laitier de haut fourneau granulé broyé, formulations sèches et humides fabriquées à partir de celui-ci, et leurs procédés de préparation
EP3597614A1 (fr) * 2018-07-17 2020-01-22 HeidelbergCement AG Nouveau système de retardement pour ciments à base de csa
CN109020293A (zh) * 2018-09-18 2018-12-18 济南大学 一种超支化型缓凝剂的制备及应用
CN111039683B (zh) * 2019-12-30 2022-08-09 长兴兴鹰新型耐火建材有限公司 一种用于垃圾焚烧窑的抗硫碱耐腐蚀耐磨浇注料及其制备工艺
WO2021180594A1 (fr) * 2020-03-13 2021-09-16 Sika Technology Ag Liant hydraulique à base de laitier, composition sèche de mortier comprenant ce liant et système d'activation d'un liant à base de laitier
CN112266070A (zh) * 2020-09-16 2021-01-26 中国神华能源股份有限公司国华电力分公司 一种脱硫废水中重金属钝化处理方法及装置
CN114105548B (zh) * 2022-01-25 2022-05-13 中国石油大学(华东) 一种稠化时间可控的地质聚合物固井液
CN116421923A (zh) * 2023-04-12 2023-07-14 江阴市月城昇利生物科技有限公司 焚烧飞灰处理葡庚复合液的制备方法

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US3959004A (en) 1975-04-21 1976-05-25 Westvaco Corporation Process for producing low porosity cement
US4032353A (en) 1975-04-21 1977-06-28 Westvaco Corporation Low porosity aggregate-containing cement composition and process for producing same
US3960582A (en) 1975-04-21 1976-06-01 Westvaco Corporation Low porosity cement and process for producing same
GR68405B (fr) * 1979-05-31 1981-12-29 Flowcon Oy
JPS6090860A (ja) * 1983-10-25 1985-05-22 宇部興産株式会社 高温度用低比重セメントの品質劣化を防止する方法
CH684476A5 (de) * 1991-11-27 1994-09-30 Sandoz Ag Zementmischungen.
JP3174400B2 (ja) * 1992-05-28 2001-06-11 味の素ファルマ株式会社 腹腔洗浄液
ATE516335T1 (de) 2006-08-07 2011-07-15 Prad Res & Dev Nv Geopolymerzusammensetzung und seine anwendung für kohlenstoffdioxydlagerung
EP2093200A1 (fr) 2008-02-19 2009-08-26 Services Petroliers Schlumberger Formulation pompable de géopolymère pour un application dans les champs de pétrole
CN102443815A (zh) * 2010-09-30 2012-05-09 刘世超 铝金属清洗剂

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EP3070065A1 (fr) 2016-09-21
US20180072623A1 (en) 2018-03-15
AU2016232648A1 (en) 2017-08-17
MA41783A (fr) 2018-01-23
WO2016146251A1 (fr) 2016-09-22
EA201792026A1 (ru) 2017-12-29
CA2979434A1 (fr) 2016-09-22
CN107428612A (zh) 2017-12-01

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