WO2022010425A1 - Nouveau matériau cimentaire supplémentaire et son procédé de production - Google Patents

Nouveau matériau cimentaire supplémentaire et son procédé de production Download PDF

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Publication number
WO2022010425A1
WO2022010425A1 PCT/TR2020/050597 TR2020050597W WO2022010425A1 WO 2022010425 A1 WO2022010425 A1 WO 2022010425A1 TR 2020050597 W TR2020050597 W TR 2020050597W WO 2022010425 A1 WO2022010425 A1 WO 2022010425A1
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WIPO (PCT)
Prior art keywords
mixture
based material
calcium
clay
activated
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Ceased
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PCT/TR2020/050597
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English (en)
Inventor
Mehmet Ali Gülgün
Pozhhan MOKHTARI
Sorour SEMASARI PARAPARI
Kosar HASSANNEZHAD
Sezen DÖNMEZ
Yasemin AKYOL
Gilles COVELLO
İsmail GÖKALP
Toman ERENOGLU
Emre BIRINCI
Caglar GEVEN
Abdullah Özgür ÜSTÜN
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Sabanci Universitesi
Akcansa Cimento Sanayi Ve Ticaret AS
Original Assignee
Sabanci Universitesi
Akcansa Cimento Sanayi Ve Ticaret AS
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Priority to PCT/TR2020/050597 priority Critical patent/WO2022010425A1/fr
Publication of WO2022010425A1 publication Critical patent/WO2022010425A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • C04B7/00—Hydraulic cements
    • C04B7/12—Natural pozzuolanas; Natural pozzuolana cements; Artificial pozzuolanas or artificial pozzuolana cements other than those obtained from waste or combustion residues, e.g. burned clay; Treating inorganic materials to improve their pozzuolanic characteristics
    • C04B7/13—Mixtures thereof with inorganic cementitious materials, e.g. 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
    • 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
    • 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
    • C04B2103/0068—Ingredients with a function or property not provided for elsewhere in C04B2103/00
    • C04B2103/0088—Compounds chosen for their latent hydraulic characteristics, e.g. pozzuolanes
    • 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

Definitions

  • the present invention relates to a novel supplementary cementitious material (SCM) mainly comprising an activated mixture having at least an activated clay-based material and an activated calcium-based material, a method for producing the same and binders containing a mixture of said novel SCM with cement, optionally ordinary Portland cement (OPC).
  • SCM novel supplementary cementitious material
  • OPC ordinary Portland cement
  • Cement is the main component of concrete and important for increasing durability of concrete.
  • WBCSD World Business Council for Sustainable Development
  • cement is the most widely used material on earth after water.
  • This industrial activity comes with a heavy environmental burden.
  • C0 2 world carbon dioxide
  • This greenhouse gas is emitted during cement production by fossil fuel combustion and also by conversion of limestone (CaC0 3 ) to lime (CaO) during high temperature reactions of clinker production.
  • CaC0 3 limestone
  • CaO lime
  • the cement industry has already reached significant reductions in the C0 2 emissions associated with cement production. This is done over the increased energy efficiency, use of alternative fuels including a wide range of wastes and through partial replacement of Portland cement by using SCM which requires less energy to produce than clinkers.
  • Clay minerals are preferable to use as SCM, since they have pozzolanic characteristics after being activated by a heat treatment process. Studies have demonstrated that efficiency and pozzolanic reactivity of the calcined clays are highly dependent on the type of the clay. Furthermore the range of calcination temperature applied during heating and cooling process also affects the efficiency of clays. Accordingly, it was noted that mineralogical purity of clays are important and activated clay can only be used as an efficient SCM if it has a high mineralogical purity (i.e., high-grade clay). Although the existence of clays is common on the earth crust in many places, the applicable and commercially useable high-grade clay deposits are relatively few.
  • clays rarely occur in nature as pure deposits but rather as mixtures of clays and non-clay minerals such as carbonates, feldspars and quartz. So far, low-grade clay deposits have been ignored as potential candidates for cement industries. Therefore, a potential usage of multicomponent clay deposits (i.e., low-grade clay) as pozzolanic materials needs to be investigated.
  • US 4737191 A discloses a process for the preparation of hydraulic binders by applying heat treatment on a raw material containing intimately mixed clay phases and calcium carbonate, at a temperature between 700 and 900 degrees C; applying, during the heat treatment of said material, a sufficient partial pressure of carbonic gas to oppose the thermal dissociation of the calcium carbonate in excess of that which directly combines with the clay phases; whereby there is obtained simultaneously both activation of the clay phases by dehydroxylation (pozzolanic activation) and reaction of said dehydroxylated clay phases directly with a portion of the calcium carbonate to form lime combinations with potential hydraulic properties, without formation of free lime; and mixing the obtained active product with clinker, wherein the amount of active product in the mixture does not exceed 95%.
  • US 4737191 A aims to prepare a SCM that especially prevents the formation of any free lime during the heating treatment.
  • WO 2017202849 A1 proposes a method for producing a supplementary cementitious material comprising converting dolomite (CaMg(C0 3 ) 2 ) and aluminium silicate (containing Al 2 0 3 and Si0 2 ) to supplementary cementitious material by burning them under reducing conditions in the temperature range of >700 °C to 1100 °C if no mineralisers are contained, and in the temperature range of 625 °C to 950°C if mineralisers are contained. Furthermore, WO 2017202849 A1 illustrates experiments carried out on different types of clays by burning them with or without dolomite or limestone at different temperatures; and also shows comparative results of said experiments based on the compressive strengths of obtained SCMs. In conclusion, it notifies that an already high-grade clay material can be improved better than low- grade clay materials by burning.
  • dolomite CaMg(C0 3 ) 2
  • aluminium silicate containing Al 2 0 3 and Si0 2
  • Another object of the present invention is to overcome the abovementioned shortcomings of the prior art.
  • Another object of the present invention is to provide a supplementary cementitious material (SCM) and a method for producing the same with minimized carbon dioxide emission.
  • Another object of the present invention is to provide a highly reactive supplementary cementitious material (SCM) produced by activation of a low-grade clay and a method for producing the same.
  • Another object of the present invention is to provide a supplementary cementitious material (SCM) and a method for producing the same, where the activation of starting materials takes place at even lower temperatures.
  • SCM supplementary cementitious material
  • Another object of the present invention is to provide a binder and also a concrete material obtained with even greater energy savings and with minimized carbon dioxide emission.
  • Another object of the present invention is to provide a binder and also a concrete material having improved mechanical and durability properties.
  • a further object of the present invention is to provide a binder and concrete material with a comparatively high content of supplementary cementitious material.
  • the present invention proposes a supplementary cementitious material (SCM) comprising an activated mixture having at least an activated clay-based material and an activated calcium-based material, wherein said activated mixture is obtained by subjecting a mixture of at least a clay-based material and a calcium-based material together into an activation (instead of separate activation) treatment till 70-95 %, preferably until 70-90% of said calcium-based material is activated .
  • Said mixture comprises the clay-based material in an amount minimum 70% by weight of the mixture where said clay-based material contains clay source of at least 40% by weight; and the calcium-based material in an amount between 10-30% by weight of the mixture where said calcium-based material contains calcium source of at least 50 % by weight.
  • said clay-based material is a mixture having at least one or more of kaolinite, illite, smectite, zeolites and amorphous aluminosilicates.
  • said calcium-based material is any calcium source that gives free-lime (CaO) upon thermal decomposition below 900 °C.
  • said calcium-based material comprises one or more of any one of calcium carbonate phases, dolomitic carbonates with calcium content and calcium sulphates.
  • the mixture of said clay-based material and said calcium-based material has been subjected to a thermal treatment or a mechanical treatment for obtaining the activated mixture and producing the SCM according to the present invention.
  • the thermal treatment is performed by heating the mixture of said clay-based material and said calcium-based material together up to a treatment temperature between 700-900°C.
  • said mixture has been heated to the treatment temperature by constant increment in temperature at a rate of 10 °C/min.
  • the ratio of activated Ca ions to activated Si+AI ions lays between 1.5 to 3.0.
  • the present invention further proposes a method for producing SCM comprising the steps of (a) providing a mixture of at least a clay-based material and a calcium- based material; and (b) subjecting said mixture to an activation treatment for obtaining an activated mixture until 70-95 %; and preferably until 70-90 % of said calcium-based material is activated. Furthermore, amount of the clay-based material in said mixture is minimum 70 % by weight of said mixture, where said clay-based material contains clay source of at least 40 % by weight; and amount of the calcium-based material in said mixture is between 10-30 % by weight of said mixture, where said calcium-based material contains calcium source of at least 50 % by weight.
  • step (b) of the disclosed method said mixture has been subjected to a mechanical treatment or a thermal treatment for obtaining said activated mixture.
  • thermal treatment embodiment the mixture of said clay-based material and said calcium-based material together is heated up to a treatment temperature between 700-900°C.
  • said mixture has been heated to the determined treatment temperature by constant increment in temperature at a rate of 10 °C/min.
  • the method may optionally comprise a step for cooling the obtained activated mixture, performed after method step (b).
  • the mixture of the starting materials is isothermally kept at the treatment temperature for a predetermined duration.
  • the invention discloses a binder comprising a mixture of cement and SCM according to present invention; and also concrete material comprising such a binder.
  • Fig. 1 presents TGA of LI
  • Fig. 2a presents DSC/TGA curve of LI sample between 25-300 °C
  • Fig. 2b presents DSC/TGA curve of LI sample between 300-1000 °C
  • Fig. 3a presents DSC/TGA curve of L2 sample between 25-300 °C
  • Fig. 3b presents DSC/TGA curve of L2 sample between 300-1000 °C
  • Fig. 4a presents DSC/TGA curve of L3 sample between 25-300 °C
  • Fig. 4b presents DSC/TGA curve of L3 sample between 300-1000 °C Detailed Description of the Invention
  • the present invention concerns a novel supplementary cementitious material (SCM); a method for producing the same and a binder containing a mixture of said novel SCM with cement, optionally with ordinary Portland cement (OPC).
  • SCM novel supplementary cementitious material
  • OPC ordinary Portland cement
  • Supplementary cementitious materials are materials that contribute to the properties of cement through hydraulic or pozzolanic reactions where pozzolanic reaction is characterized by the consumption of calcium hydroxide (CH) by reactive silica or alumina contained in pozzolans, forming calcium-silicate hydrate (C-H-S) or calcium aluminium silicate hydrate (C-A-S-H).
  • SCMs are generally used to partially replace the Portland cement component, and the level of replacement varies from around 10 % to 50 % depending on the nature (especially mineralogical and chemical composition) of the replaced SCM. Generally, the required amount of SCM decreases as the reactive silica content of the SCM increases or as the calcium or alkali content of the SCM decreases.
  • the novel supplementary cementitious material according to the present invention comprises an activated mixture having at least an activated clay-based material and an activated calcium-based material, where said activated mixture of the activated clay-based material and the activated calcium-based material is obtained by subjecting a mixture of at least a clay-based material and a calcium-based material together into an activation treatment till 70-95 % by weight of said calcium-based material is activated. Furthermore, the amount of the materials in starting mixture (the mixture of at least a clay-based material and a calcium-based material) is well regulated.
  • the amount of said clay-based material(s) is minimum 70 % by weight of the mixture, and the amount of said calcium-based material(s) is between 10-30 % by weight of the mixture, i.e. the mixture of the clay-based material(s) and the calcium-based material(s) before activation treatment is performed.
  • the clay-based material of the mixture contains clay source at least 40% by weight said clay-based material; and the calcium-based material contains calcium source at least 50 % by weight of said calcium-based material.
  • clay-based material refers to a solid material comprising a mixture of several clay minerals (such as kaolinite, smectite, illite and montmorillonite) generally associated with non-clay minerals, which are strongly affected by the nature of the parent rocks.
  • clay-based materials according to the present invention are also named as schist type materials instead of pure clayey phases.
  • Clay-based materials generally comprise a mixture of aluminosilicates, quartz, carbonates, and/or other minor phases. They are almost well distributed geographically on the earth and have pozzolanic characteristics after being activated by a treatment process.
  • calcium-based material disclosed herewith shall be understood as source of calcium ions.
  • the calcium-based material according to the present invention may be any calcium source that gives CaO upon thermal decomposition below 900 C.
  • said calcium-based material comprises one or more of any one of calcium carbonate phases, dolomitic carbonates with calcium content and calcium sulphates.
  • a given "clay-based material”, a given “calcium-based material” or a given “mixture of at least a clay-based material and at least a calcium-based material” have different properties before and after they have subjected to an activation treatment.
  • an "activated clay-based material” has different properties as compared to the original "clay-based material” prior to its activation treatment
  • an "activated calcium-based material” has different properties as compared to the original "calcium-based material” prior to its activation treatment.
  • the same also applies to "mixture” and “activated mixture having at least an activated clay-based material and an activated calcium-based material” (“activated mixture”).
  • the present invention basically relates to a novel SCM comprising an activated clay- based material and an activated calcium-based material and also to a proper activation method for rendering an effective SCM.
  • the surprising and game-changing effect is obtained where activation treatment of said starting materials is performed together, i.e. the mixture of clay-based material and calcium-based material is subjected to activation treatment at the same time and same medium. Furthermore, the activation treatment of said mixture is terminated when 70-95 % (by weight) of said calcium-based material is activated.
  • Activation percentage of calcium-based material may be measured by thermogravi metric (TGA) analysis, differential thermal analysis (DTA) or XRD analysis.
  • the inventors of the present invention notified that activation of calcium-based material provides excessive source of Calcium ion (Ca 2+ ) as free-lime (CaO) and in case of the activation treatment is applied to a mixture of calcium-based material together with the activated clay-based material till 70-95 % of said calcium-based material is activated, the excessive source of Calcium ion (Ca 2+ ) as free-lime (CaO) provides strongly basic condition for forming more C-S-H (calcium-silicate hydrate) and C-A-S-H (calcium aluminium silicate hydrate) during the consequent hydration reactions upon being exposed to water.
  • C-S-H calcium-silicate hydrate
  • C-A-S-H calcium aluminium silicate hydrate
  • C-S-H and optionally the C-A-S-H are the main products of the hydration of Portland cement and this phase transformation and formation of strength developer products causes more durability of composite cement.
  • the activation amount of materials is determined based on total amount of weight loss of said materials.
  • the weight loss amount measured in said techniques may also include evaporation of absorbed water below 300 °C, where said evaporated water is mainly not present in the structure of the material.
  • the amount of 70-95 % activation of the calcium-based material of the starting mixture corresponds to 75-95% of the total weight loss observed in the before-mentioned materials starting from the temperature of 300 °C.
  • the same activation percentages can also be monitored with the help of XRD measurements by calculating the amount of crystalline calcium- based materials.
  • the thermal activation process should continue until the 70-95 % of the crystalline calcium-based material(s) is decomposed.
  • the amount of the materials in the starting mixture is well regulated.
  • the amount of said clay- based material(s) is minimum 70 % and the amount of said calcium-based material(s) is between 10-30 % by weight of the mixture, where the clay-based material of the mixture contains clay source at least 40% by weight said clay-based material; and the calcium-based material contains calcium source at least 50 % by weight of said calcium-based material
  • the amount of the clay source in a clay-based material is at least 50 % by weight of said clay-based material.
  • the amount of calcium-based material is between 15-30% and more preferably 20-30% by weight of the starting mixture.
  • the SCM disclosed according to the present invention comprises the activated mixture of clay-based material and calcium-based material -and thus sources thereof- where ratio of activated Ca ions to activated Si+AI ions lays between 1.5 to 3.0.
  • the activation of the mixture is preferably performed by using mechanical treatment or thermal treatment techniques.
  • the mechanical treatment technique is mainly based on intensive grinding process where the effect of grinding is two fold: first intensive grinding activates the mixture of clay based materials and calcium-based materials by interrupting their crystalline structure thereby making them vulnerable to basic aqueous solutions' attach; secondly grinding increases the surface area of the powders by increasing fineness of the ground mixture, which is optionally measured according to the Blaine surface area (cm 2 /g) parameter.
  • the thermal treatment technique relates to application of heat to the mixture of the starting materials, where the maximum temperature applied on said mixture during the treatment is important. It is reported that the average activation temperature of multicomponent clay deposits (e.g. clay-based materials) is between 300 to 750 °C; and the average activation temperature of carbonates (e.g. calcium-based materials) is between 750 to 850 °C.
  • the activation temperature i.e. the maximum temperature applied to achieve activation
  • the average activation temperature of the mixture according to the present invention is between 700 to 900 °C according to thermogravimetric analysis.
  • the determined temperature range is surprisingly different than expected, which is due to the interaction of the clay-based material with calcium-based material in the mixture during the activation process.
  • the activation of clay-based schist type materials causes dehydroxylation of the clayey phases by reactivating them and also decomposes the calcium-based material.
  • said mixture of starting materials has been subjected to thermal treatment by heating the mixture up to a treatment temperature between 750 to 900 °C, and more preferably around 850 °C.
  • the thermal treatment applied to the mixture of starting materials is preferably carried out in a furnace or a reactor; where the temperature of the furnace or reactor in which said mixture is kept is raised from room temperature to the determined treatment temperature.
  • said mixture of the starting materials is heated to the treatment temperature by constant increment in temperature at a rate of 10 °C/min.
  • any characterization as “approximately”, “around” and similar expression in relation to a numerical value means that up to 10 % higher and lower values are included, preferably up to 5 % higher and lower values, and in any case at least up to 1 % higher and lower values, the exact value being the most preferred value or limit.
  • the activation ratio refers the weight ratio of the amount of activated calcium-based material of the activated mixture to the amount of calcium-based material (before being subjected to activation treatment) of the starting mixture.
  • the activation ratio of the calcium- based material is 70-90 %, more preferably 80-90 %, and most preferably around 80 %.
  • TGA thermogravimetric
  • applied heat or achieved fineness corresponds to an amount corresponding to 70-95%, preferably to 70-90 %, more preferably 80-90 %, and most preferably around 80 % of the total weight loss.
  • the given percentages cause avoiding dead-burning of the clay-based material; and reactivate the materials of the mixture to the proper stage.
  • activation means changing one or more of chemical properties, crystallinity, phase composition, three dimensional array and binding behaviour of the structural atoms induced by applying energy.
  • activation/activated means dehydroxylation of/ dehydroxylated clay-based material; or calcination of/ calcined calcium-based material.
  • Dehydroxylation involves optionally the heating process through which the hydroxyl group (OH) is released by forming a water molecule and results in the loss of structural water, and the destruction of the crystal structure of the clayey material.
  • Calcination is used to mean a thermal treatment process to bring about a thermal decomposition.
  • Decomposition temperature of a substance is the temperature at which the substance chemically decomposes. The reaction is usually endothermic as heat is required to break chemical bonds in the compound undergoing decomposition.
  • a method for producing a supplementary cementitious material comprises the method steps of (a) providing a mixture of at least a clay-based material and a calcium-based material; and (b) subjecting said mixture to an activation treatment for obtaining an activated mixture until 70-95% of said calcium-based material is activated.
  • the mixture of the starting materials preferably comprises said calcium-based material in an amount between 10-30% by weight of the mixture; and said clay-based material in an amount of minimum 70% by weight of the mixture.
  • said clay-based material contains clay source of at least 40% by weight; and said calcium-based material contains calcium source of at least 50 % by weight.
  • said mixture of the starting materials has been subjected to activation treatment together until 70-90% of said calcium-based material is activated, more preferably until 80-90, and most preferably until around 80 % of said calcium-based material is activated.
  • Disclosed activation of the mixture of starting material is optionally performed by applying thermal treatment or mechanical treatment on said mixture.
  • the mechanical treatment technique is mainly based on a grinding step.
  • said mixture has been subjected to a thermal treatment, by heating the mixture up to a temperature between 700 to 900°C, preferably between 750 to 900 °C, and more preferably around 850 °C.
  • said mixture has been heated to determined temperature by constant increment in temperature at a rate of 10 °C/min. Accordingly, the temperature will increase up the start point of decomposition and will wait isothermally for a term until 70-95% (preferably 70-90%, more preferably 80-90% and most preferably around 80 %) of said calcium-based material is decomposed.
  • the duration for keeping the mixture of starting materials isothermally at the determined treatment temperature for decomposing (activating) the same can be determined based on the amount of starting mixture and amount of the impurities therein.
  • range of the treatment duration may be determined according to thermogravi metric analysis. This isothermal heat scenario causes the heat to be distributed uniformly through the mixture and homogeneity of activation.
  • the desired activation percentage of the calcium-based material could not be reached and in a case where the decomposition is continued for a duration longer than a predetermined treatment duration, dead-burning of the mixture of starting materials occurs.
  • the inventors of the present invention measured that required amount of heat for activating the starting mixture according to claim 12 or claim 13, is approximately 0.3 kJ per gram of clay-based material which decomposes between 350 and 700 °C, and approximately 0.5 - 0.6 kJ per gram of calcium-based material which decomposes between 650 and 900 °C.
  • the method of the present invention may optionally comprise step (c) where the obtained activated mixture after step (b), i.e. the produced SCM, is typically cooled down to room temperature.
  • the mixture can also be cooled rapidly i.e., for preventing phase transformation or crystallization.
  • the cooling treatment is performed by air quenching which will ascertain the decomposition and consequently reactivation of materials. It is better to air quench the heat-treated and activated mixture on the metallic plate which has the proper thermal conductivity.
  • the binder of the present invention comprises cement and SCM which comprises activated mixture of at least an activated clay-based material and an activated calcium-based material, wherein the clay-based material has been activated together with the calcium-based material till 70-95 % of said calcium- based material is activated.
  • the binder of the present invention preferably contains up to %45, more preferably 20 to 40 % and even more preferably around 30% SCM by weight.
  • the cement disclosed herewith is optionally ordinary Portland cement (OPC).
  • OPC ordinary Portland cement
  • the present invention proposes a concrete material comprising the binder of the present invention, together with optional admixtures and aggregates.
  • said concrete material is prepared with a water/cement ratio of 0.5.
  • Samples of starting mixtures (LI, L2 and L3) are prepared, which respectively contain 0%, 9% and 15% of calcium carbonate, where sample L3 is a mixture according to the present invention.
  • TGA thermo-gravimetric analysis
  • any dead-burnt sample does not contain any active clayey material for being used in cement pozzolanic reactions.
  • schist type of materials i.e., the mixture according to the present invention
  • a good amount is 70-95% of the total calcium based material amount for obtaining improved advantage of the present invention.

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

Abstract

La présente invention propose un nouveau matériau cimentaire supplémentaire (SCM) comprenant un mélange activé comportant au moins un matériau à base d'argile activé et un matériau à base de calcium activé. Ledit mélange activé est obtenu en soumettant un mélange d'au moins un matériau à base d'argile et d'un matériau à base de calcium ensemble à un traitement d'activation jusqu'à l'activation de 70 à 95 % dudit matériau à base de calcium ; la proportion du matériau à base d'argile dans ledit mélange étant au minimum de 70 % en poids dudit mélange, ledit matériau à base d'argile contenant une source d'argile à au moins 40 % en poids ; et la proportion du matériau à base de calcium dans ledit mélange étant comprise entre 10 et 30 % en poids dudit mélange, ledit matériau à base de calcium contenant une source de calcium à au moins 50 % en poids. L'invention propose en outre un procédé de production de SCM et un liant contenant un mélange dudit nouveau SCM avec du ciment.
PCT/TR2020/050597 2020-07-07 2020-07-07 Nouveau matériau cimentaire supplémentaire et son procédé de production Ceased WO2022010425A1 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4484396A1 (fr) * 2023-06-27 2025-01-01 Heidelberg Materials AG Procédé de fabrication de ciment composite

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4737191A (en) 1984-06-25 1988-04-12 Ciments De Champagnole Process for manufacturing hydraulic binders
WO2017202849A1 (fr) 2016-05-24 2017-11-30 Heidelbergcement Ag Matériau cimentaire supplémentaire fait en silicate d'aluminium et dolomite

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4737191A (en) 1984-06-25 1988-04-12 Ciments De Champagnole Process for manufacturing hydraulic binders
WO2017202849A1 (fr) 2016-05-24 2017-11-30 Heidelbergcement Ag Matériau cimentaire supplémentaire fait en silicate d'aluminium et dolomite

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4484396A1 (fr) * 2023-06-27 2025-01-01 Heidelberg Materials AG Procédé de fabrication de ciment composite
WO2025003136A1 (fr) 2023-06-27 2025-01-02 Heidelberg Materials Ag Procédé de fabrication de ciment composite

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