Cement material, curable in the presence of water and comprising a hydraulic binder composition, characterised in that said hydraulic binder composition contains a mixture of hydraulic binders and a mixture of sulphate sources, wherein said hydraulic binder mixture comprises: - at least one hydraulic binder containing an alite-type mineralogical phase and - at least one hydraulic binder containing an aluminate-type mineralogical phase, mainly consisting of yeelimite (C4A3$) or a mixture of yeelimite and calcium monoaluminate (CA), said mixture of sulphate sources containing - at least one sulphate source with a solubility of less than 4 g.L-1, and - at least one sulphate source with a solubility higher than 4 g.L-1, said cement material optionally comprising, in addition to said hydraulic binder composition, mineral additions, fine granulates, large granulates and additives. Use of said curable cement material in order to implement a material capable of setting in cold weather, in particular a concrete, a mortar, a grout, a coating or a cement paste to be used at a temperature of -10°C to +5°C.
C04B 28/16 - Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing anhydrite
Hydraulic binder setting and curing accelerator comprising the following content by weight: ° 25 to 35 % of at least one sulfoaluminate clinker, - 45 to 55 % of at least one sulphate source with a solubility higher than 4 g. L-1 in water at 20 °C, and ° 10 to 20 % of at least one sulphate source with a solubility of less than 4 g.L-1 in water at 20 °C, said clinker containing calcium aluminate-type mineralogical compounds. The cement composition containing said setting and curing accelerator can be used at temperatures of 5°C to 35°C, and to obtain a sprayed concrete or a grouting or bedding mortar with enhanced mechanical compression strength.
C04B 28/16 - Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing anhydrite
C04B 40/00 - Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
A process for treating polluted soils, in particular soils with a leachable fraction greater than 0.4%, wherein said leachable fraction contains predominantly anions, in particular sulfate ions, and/or heavy metals, characterized in that it comprises mixing said soil with a sulfoaluminate‑clinker‑based hydraulic binder, in soil/binder weight proportions of between 1 and 40 parts of binder per 100 parts of soil, said sulfoaluminate clinker containing more than 50% by weight of ye'elimite C4A3$ phase, less than 15% by weight of belite C2S phase, and from 1% to 5% by weight of free lime CaO. Said process is used for stabilizing soils in situ or before dumping, soils polluted in particular with sulfate anions and/or heavy metal cations.
C04B 40/00 - Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
C04B 111/00 - Function, property or use of the mortars, concrete or artificial stone
4.
NOVEL SULFOALUMINATE‑CLINKER‑BASED HYDRAULIC BINDER AND USE THEREOF IN A PROCESS FOR TREATING POLLUTED SOILS
The invention relates to a hydraulic binder based on a sulfoaluminate clinker comprising the mineralogical phases ye'elimite C4A3$, mayenite C12A7, free lime CaO, and optionally belite C2S, characterized in that, in said clinker, the mineralogical phases are present in the proportions of from 20% to 50% by weight of ye'elimite C4A3$ phase, from 5% to 80% by weight of mayenite C12A7 phase, and from 1% to 5% by weight of free lime CaO, the weight ratio between the mayenite C12A7 and ye'elimite C4A3$ phases being between 0.1 and 10. The binder can be used in a process for treating polluted soils, in particular soils with a leachable fraction greater than 0.4%, said leachable fraction containing predominantly anions, in particular sulfate ions and/or chloride ions, and/or heavy metal cations, by mixing said soil with said hydraulic binder, in soil/binder weight proportions of between 1 and 40 parts of binder for 100 parts of soil. It makes it possible to stabilize soils which are polluted or to stabilize soils before dumping.
Use of a polycarbonate polymer as plasticizer and set retarder of a hydraulic binder predominantly comprising a sulphoaluminate clinker, the sulphoaluminate clinker containing at least 30% by weight of yeelimite phase.
The invention relates to a structural lightweight concrete or mortar composition which, in the fresh state, includes an hydraulic binder, aggregate, and water, characterized in that the composition includes: an hydraulic binder content including cement and optional additions, which is greater than or equal to 280 kg/m3 of fresh concrete, coarse aggregate and/or fine aggregate, a volume proportion of at least 70% of said fine and/or coarse aggregate consisting of fine and/or coarse lightweight particles, the actual dry density of which is between 800 and 1,600 kg/m3, the total amount of aggregate being greater than or equal to 500 L/m3 of fresh concrete, a superplasticizer, at least one thickening agent, and effective water in an effective water/hydraulic binder weight ratio of between 0.40 and 0.65. The composition can be used for producing a self-placing lightweight concrete.
C04B 28/02 - 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
C04B 38/08 - Porous mortars, concrete, artificial stone or ceramic warePreparation thereof by adding porous substances
C04B 40/00 - Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
7.
WATER-SOLUBLE ANTIFOAM ADDITIVE FOR A CEMENT COMPOSITION, AQUEOUS SOLUTION CONTAINING SAME AND USE THEREOF IN MORTARS OR CONCRETES
The cement composition anti-foam additive is in the form of a fatty alcohol ester that is soluble in an aqueous medium at acidic pH, and hydrolysable in a basic medium, i.e. when said ester is incorporated into said cement composition, while releasing an active anti-foam molecule. This ester is preferably a fatty alcohol ester of a quaternary ammonium carboxylate, that is soluble in an aqueous solution of a superplasticizer, in particular such as a polycarboxylate with poly(ethylene oxide) side chains. Use for reducing the amount of air entrained during mixing or blending of mortars or concretes.
C04B 24/26 - Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
C04B 40/00 - Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
The invention relates to a superplasticizer for a cementitious composition, such as cement paste, mortar or concrete, characterized in that it is in the form of surface-modified particles constituted of mineral nanoparticles covered with a polymer coating formed predominantly of polyalkyl oxides. It enables a good fluidity to be maintained, without retardation of setting, and also gives the mortar or concrete composition anti-shrink properties.
C04B 40/00 - Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
C09C 1/02 - Compounds of alkaline earth metals or magnesium
The invention relates to an anti-shrink agent for a cementitious composition, such as cement paste, mortar or concrete, characterized in that it is in the form of surface-modified particles constituted of mineral nanoparticles covered with a polymer coating formed predominantly of polyalkyl oxides. It makes it possible to reduce the shrinkage by more than 65%, without retardation of setting, and also gives the mortar or concrete composition superplasticizing properties.
C04B 28/02 - 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
C09C 1/02 - Compounds of alkaline earth metals or magnesium
The invention relates to a water retention agent for a cementitious composition, characterised in that it takes the form of a liquid aqueous suspension of at least one polysaccharide at a mass concentration of between 15 and 30 % in an aqueous solution of a strong base salt, excluding ammonium salts, with an anionic strength of between 1.25 mol/L and 15 mol/L, having a pH greater than 9 and containing an attapulgite in micronised form and at least one non-phyllitic mineral powder, referred to hereafter as filler, which is chemically inert in said aqueous suspension and which has a grain size of between 0.1 and 100 micrometres, said aqueous suspension being stable at least in a temperature range of between 5°C and 30°C. The invention also relates to the use of said agent for increasing both the viscosity and the water retention capacity of cementitious compositions without affecting the spreading ability thereof.
C04B 24/38 - Polysaccharides or derivatives thereof
C04B 28/02 - 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
11.
TEMPERATURE-STABLE LIQUID AQUEOUS POLYSACCHARIDE SUSPENSIONS AND USE THEREOF AS THICKENING AGENTS IN CEMENTITIOUS COMPOSITIONS
The invention relates to a liquid aqueous suspension of polysaccharide, containing a mass concentration of at least one polysaccharide of between 15 and 35 % in the form of partially hydrated particles dispersed in an aqueous solution of a strong base salt, excluding ammonium salts, with an ionic strength of between 1.25 mol/L and 15 mol/L, having a pH greater than 9 and containing at least one non-phyllitic crystalline mineral powder, referred to hereafter as filler, which is chemically inert in said aqueous suspension and which has a grain size of between 0.1 and 100 micrometres and an attapulgite in micronised form, said aqueous suspension being stable at least in a temperature range from 5 to 30 30 °C. The invention is suitable for use as an agent for thickening cementitious compositions.
C04B 24/38 - Polysaccharides or derivatives thereof
C04B 28/02 - 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
12.
CEMENT COMPOSITION FOR A SELF-LEVELING FLUID SCREED, AND SELF-LEVELING FLUID SCREED THUS PRODUCED
The invention relates to a cement composition for a self-leveling fluid screed with limited contraction, made of a mixture of a cement binder, a fluidizing admixture, an aggregate and water, characterized in that the binder consists of 70 to 85 wt % of Portland cement, 7 to 18 wt % of sulfoaluminate clinker, and 6 to 14 wt % of calcium sulfate, with a mole ratio of calcium sulfate C$ to calcium sulfoaluminate C4A3$ of between 5 and 7, and a water to binder weight ratio of between 0.60 and 0.90. The self-leveling fluid screed thus produced has a mechanical resistance to compression at 24 hours that is at least equal to 1 MPa, a shrinkage at 7 days, measured under a relative hygrometer of 50%, of less than 500 μm/m, and an endogenous expansion value measured at 7 days of less than 1000 μm/m, as well as very slightly raised edges.
The present invention relates to a method of treating marine or river dredging sediments, especially harbour zone sediments, whose free water content is between 40% and 80% by weight, for the purpose of obtaining a solid material which is easy to handle, characterized in that it comprises the following successive steps: - mixing said sediments with a treatment composition comprising a sulphoaluminate binder and at least one other component selected from a sulphate source and a catalyst of the hydration reactions of the sulphoaluminate binder, - a step of setting of said mixture, leading to a compact mixture having a free water content of less than 20% by weight, - then fractionating said compact mixture. The sediment thus treated may be incorporated into concrete or mortar formulas, which then have leachable fractions of less than 1 % by weight.
C04B 28/14 - Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
C04B 28/16 - Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing anhydrite
14.
CEMENT COMPOSITION FOR SELF-LEVELLING CONCRETE AND SELF-LEVELLING CONCRETE CONTAINING SUCH COMPOSITION
The invention relates to a cement composition for a self-levelling concrete, that comprises a mixture of rheology-modifying additives, characterised in that it comprises the combination of at least a first agent for substantially increasing the shear threshold of the concrete in the fluid state, selected from a natural polysaccharide ether, a hydroxyalkyl guar ether, a hydroxyethylcellulose or a hydroxypropyl guar, which are hydrophobically modified with the introduction of hydrophobic side grafts, and at least a second viscosity-increasing agent for substantially increasing the viscosity of said concrete in the fluid state, selected from a non-hydrophobically-modified hydroxyalkylcellulose having a degree of polymerisation between approximately 500 and approximately 4500 and a viscosity of less than 50 PA.s in aqueous solution at 2 wt.-% and a poly (ethylene oxide), in order to limit or prevent the dynamic segregation of granulates in the concrete during the implementation thereof. The use of such a composition can replace the presence of a filler in the concrete, in particular a self-levelling concrete, without diminishing the performance concerning the spreading thereof, the sieve stability, the bleeding and the dynamic segregation relative to a concrete containing a filler, in particular a concrete having the same water/cement ratio.
C04B 24/38 - Polysaccharides or derivatives thereof
C04B 24/32 - Polyethers, e.g. alkylphenol polyglycolether
C04B 28/02 - 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
C04B 103/44 - Thickening, gelling or viscosity increasing agents
C04B 111/10 - Compositions characterised by the absence of a specified material
patents