Abstract: Disclosed is a calcium aluminate cement, including a calcium aluminate with a first crystallised mineralogical phase of calcium dialuminate CA2 including one calcium oxide CaO for two aluminium oxides Al2O3 and/or a second crystallised mineralogical phase of dicalcium alumina silicate C2AS including two calcium oxides CaO for one aluminium oxide Al2O3 and one silicon dioxide SiO2. The mass fraction of all of the first and second mineralogical phases in the calcium aluminate is greater than or equal to 80%.

Abstract: Disclosed is a hydraulically and chemically bonding refractory cement, which includes a caustic magnesia component having a BET specific surface area of at least 0.5 m2/g, and a carboxylic acid component, wherein the carboxylic acid component consists of at least one carboxylic acid that is only slightly water soluble and/or has a low dissolution rate in aqueous solutions, and which carboxylic acid component is capable of generating at least one soluble magnesium salt upon contact of the cement with water. Also disclosed is a corresponding refractory material containing the magnesia cement and to uses thereof for the manufacture of products useful in various industries.

Abstract: Disclosed is to a calcium aluminate cement, including a calcium aluminate with a first crystallised mineralogical phase of calcium dialuminate CA2 including one calcium oxide CaO for two aluminium oxides Al2O3 and/or a second crystallised mineralogical phase of dicalcium alumina silicate C2AS including two calcium oxides CaO for one aluminium oxide Al2O3 and one silicon dioxide SiO2. The mass fraction of all of the first and second mineralogical phases in the calcium aluminate is greater than or equal to 80%.

Abstract: Disclosed is a composition including an amorphous calcium aluminate with a final lime:alumina molar ratio between lower and upper limits. The amorphous calcium aluminate is a combination including at least: a first amorphous calcium aluminate with a first lime to alumina molar ratio, strictly lower than the lower limit of the predetermined range; and a second amorphous calcium aluminate with a second lime to alumina molar ratio, strictly higher than the upper limit of the predetermined range. The combination includes a first amount of the first amorphous calcium aluminate and a second amount of the second amorphous calcium aluminate, the first and second amounts being determined in such a way that the final lime to alumina molar ratio of the amorphous calcium aluminate, corresponding to the average of the first and second lime to alumina molar ratios weighted by the first and second amounts, is within the predetermined range.

Abstract: Disclosed is a composition including an amorphous calcium aluminate with a final lime:alumina molar ratio between lower and upper limits. The amorphous calcium aluminate is a combination including at least: a first amorphous calcium aluminate with a first lime to alumina molar ratio, strictly lower than the lower limit of the predetermined range; and a second amorphous calcium aluminate with a second lime to alumina molar ratio, strictly higher than the upper limit of the predetermined range. The combination includes a first amount of the first amorphous calcium aluminate and a second amount of the second amorphous calcium aluminate, the first and second amounts being determined in such a way that the final lime to alumina molar ratio of the amorphous calcium aluminate, corresponding to the average of the first and second lime to alumina molar ratios weighted by the first and second amounts, is within the predetermined range.

Abstract: Disclosed is a cement or a refractory concrete composition, including, by weight, as compared to its total weight at least: (a) from 20% to 70% of at least one aluminum organic acid, (b) from 3% to 20% of at least one deflocculant chosen from a carboxylic acid polymer, a carboxylic acid, a salt thereof, or one of their combinations, and, (c) from 7% to 44% of at least one mineral oxide. Also disclosed is the use of such an adjuvant to improve the drying time of a refractory concrete composition or to improve the permeability of a refractory concrete composition, as well as a cement composition and to a refractory concrete composition, each including such an adjuvant.

Abstract: Disclosed is a method for manufacturing calcium aluminates in an industrial furnace, according to which, continuously, into a tank made of refractory material containing a molten pool that is constantly heated, fine particles are introduced of a raw material source of alumina and/or of aluminium and of a raw material source of calcium oxide and/or of calcium having a median diameter d50 less than or equal to 6,000 ?m in order to melt the fine particles of raw material, and, continuously, at the outlet of the tank a mass of liquid calcium aluminates is recovered.

Abstract: Disclosed is an ultra-fast setting cement composition including at least amorphous calcium aluminate including by weight, as compared to amorphous calcium aluminate total weight, (a) from 35 to 55% of calcium oxide CaO (C), (b) from 19 to 55% of alumina Al2O3 (A), the C/A molar ratio being higher than or equal to 1.5, preferably higher than or equal to 1.7, characterized in that amorphous calcium aluminate is coated with a surface treatment including an organic compound having at least two hydrophilic functions and one hydrophobic chain. Also disclosed is a method to produce the cement composition, as well as to uses thereof.

Abstract: The present invention relates to an ultra-fast setting cement composition containing at least amorphous calcium aluminate including by weight, as compared to amorphous calcium aluminate total weight: (a) from 35 to 55% of calcium oxide CaO (C), (b) from 19 to 55% of alumina Al2O3 (A), the C/A molar ratio being higher than or equal to 1.5, (c) from 0 to 10% of silica SiO2, with the amorphous calcium aluminate including (d) from 5 to 16% of iron oxide Fe2O3. Also disclosed is a method to produce the cement composition, as well as to uses thereof.

Abstract: A cellular structure thermal insulation material includes by weight as compared to the material total weight: from 4 to 96% of a hydraulic binder, which prior to being contacted with water, includes at least one phase selected from C3A, CA, C12A7, C11A7CaF2, C4A3$ (Yee lemite), C2A(1-x)Fx (where x belongs to [0, 1]), hydraulic amorphous phases having a C/A molar ratio ranging from 0.3 to 15 and such that cumulated amounts of Al2O3 of these phases be ranging from 3 to 70% by weight of the hydraulic binder total weight, from 4 to 96% of at least one filler, the material having a pore volume ranging from 70% to 95%. The use of a mineral foam for making thermal insulation material as well as methods for making the mineral foam are also described.

Abstract: A fluidizing composition in the form of a liquid or in the form of a powder including at least one superplasticizer chosen from polycarboxylate ethers, characterized in that it includes from 1 to 20 parts by weight of at least one aromatic hydrocarbon sulfonic acid or one of its salts chosen from alkali salts, alkaline-earth salts or one of their mixtures, for 100 parts by weight of the superplasticizer. A method for preparing such fluidizing composition, a dry mortar incorporating the fluidizing composition, as well as plasters prepared from the dry mortar are also described.

Abstract: A fluidizing composition in the form of a liquid or in the form of a powder including at least one superplasticizer chosen from polycarboxylate ethers, characterized in that it includes from 1 to 20 parts by weight of at least one aromatic hydrocarbon sulfonic acid or one of its salts chosen from alkali salts, alkaline-earth salts or one of their mixtures, for 100 parts by weight of the superplasticizer. A method for preparing such fluidizing composition, a dry mortar incorporating the fluidizing composition, as well as plasters prepared from the dry mortar are also described.

Abstract: Stabilized aqueous suspensions include aluminous cement and/or calcium sulfoaluminous cement and binding compositions including the aqueous suspension in combination with organic binders, which are stable at room temperature and at high temperature as well as methods for preparing the same are described.

Abstract: Stabilized aqueous suspensions include aluminous cement and/or calcium sulfoaluminous cement and binding compositions including the aqueous suspension in combination with organic binders, which are stable at room temperature and at high temperature as well as methods for preparing the same are described.

Abstract: A cellular structure thermal insulation material includes by weight as compared to the material total weight: from 4 to 96% of a hydraulic binder, which prior to being contacted with water, includes at least one phase selected from C3A, CA, C12A7, C11A7CaF2, C4A3$ (Yee lemite), C2A(1-x)Fx (where x belongs to [0, 1]), hydraulic amorphous phases having a C/A molar ratio ranging from 0.3 to 15 and such that cumulated amounts of Al2O3 of these phases be ranging from 3 to 70% by weight of the hydraulic binder total weight, from 4 to 96% of at least one filler, the material having a pore volume ranging from 70% to 95%. The use of a mineral foam for making thermal insulation material as well as methods for making the mineral foam are also described.

Abstract: A clinker composition including, relative to the clinker total weight: from 30 to 85% Al2O3; from 3 to 45% CaO; from 9 to 45% MgO and having an apparent porosity, such as measured by means of the apparent porosity underwater measurement assay according to modified NF B40-312 standard ranging from 4% to 60%.

Abstract: A method for producing concrete parts and a structure includes (i) supplying a first concrete composition based on a quick binder containing Portland cement, curing accelerator system based on Al2O3, CaO lime and SO3 sulphates, a retardant system and a superplasticizer, (ii) adding a releaser system for forming a second concrete composition and pouring the second concrete composition into a concrete form. The use of a releaser system and the preparation of the first concrete composition are also disclosed.

Abstract: A ready-for-use dual-component system includes a portion (A) containing retarded aqueous-phase aluminous cement and an aqueous phase portion (B) for initiating the curing process. The portion (A) further includes boric acid or a salt thereof, at least one super-plasticizer and water. The portion (B) includes an initiator and water. The dual-component system meets the following requirements: a) the initiator includes uniquely lithium salts and contains a mixture of lithium hydroxide and at least another water-soluble lithium salt; the total mass of lithium in the portion (B) is such that, after mixing with the portion (A), ranges from 0.5 wt % to 2 wt % relative to the weight of aluminous cement in the portion (A); and c) the mass of lithium in the portion (B) added by the lithium hydroxide is such that, after mixing with the portion (A), ranges from 0.1 wt % to 1 wt % relative to the weight of aluminous cement in the portion (A).

Abstract: A dense mortar includes: (i) an ettringite binder, including calcium sulphate and a calcium aluminate mineral compound, (ii) at least one poly(alkylene oxide) comb polymer and, (iii) at least one organic resin, the organic resin accounting for less than 2% by weight of the mortar.

Abstract: The present invention relates to a hydraulic binder for low-cement content concrete. The ground mineral portion of this cement comprises an under-calcinated alumina the BET specific surface of which ranges between 8 m2/g and 20 m2/g. Said binder enables to formulate a concrete the use properties of which remain stable and constant whatever the type of silica fume used, and capable of being used over a wide working temperature range for implementation. The invention also relates to a preparation for refractory concrete, a refractory concrete and a method for making a refractory concrete.