Abstract: The application describes an admixture comprising a polymer as fluidifier of a cement composition comprising: from 20 to 64 wt. % clinker, from 5 to 60 wt. % activated clay, from 0 to 35 wt. % limestone, from 0 to 10 wt. % calcium sulfate, the proportions being relative to the dry weight of the cement composition.

Abstract: The invention relates to a composition (C) comprising from 10 to 99 wt. % secondary or tertiary alkanolamine (A) in the form of a salt, preferably an inorganic acid salt, and from 1 to 90 wt. % of non-salified alkanolamine (A).

Abstract: Disclosed is a method for using a secondary or tertiary alkanolamine for grinding cement, the method including: forming an inorganic acid salt of the alkanolamine; and adding the salified alkanolamine to a grinder.

Abstract: A method for retarding hydration of a surface of a hydraulic composition includes shaping the hydraulic composition, applying an emulsion onto the surface of the hydraulic composition, and removing a film and a surface layer formed by a non-hardened hydraulic composition from the surface of the hardened hydraulic composition after hardening the hydraulic composition. The emulsion has an oily phase and an aqueous phase, in which the oily phase is dispersed in the aqueous phase. The emulsion includes a non-quaternary amine surfactant and an acid having a set-retarding effect.

Abstract: The application relates to a method for creating a pattern on a surface of a hydraulic binder-based composition, comprising applying by printing a deactivating composition (D1) or acidic composition (A1) to a part or to the whole surface of a hydraulic binder-based composition.

Abstract: The invention relates to an anti-filming surface adjuvant for hydraulic binders comprising at least one fat and at least one anti-caking agent, to its preparation method as well as to a method for preparing a hydraulic binder composition suitable for making screeds or self-compacting concretes (SCC) including the step consisting of adding to the hydraulic binder the adjuvant according to the invention at a dosage comprised between 50 and 1,500 g/m3 of screed or of concrete.

Abstract: The present invention is mainly aimed at a set-accelerating admixture for hydraulic compositions comprising, in an aqueous solution, the reaction product of an alkanolamine with a concentrated strong acid; sulfate anions; and alkali or alkaline earth cations; having a pH comprised between 5 and 12. Moreover it is directed to a method for its preparation as well as to a method for preparing hydraulic compositions comprising the step for adding such an admixture to the hydraulic binder, before, during or after the grinding.

Abstract: The invention relates to a compound of following formula (I): the preparation method thereof and the use of same.

Abstract: A fast hydraulic binder comprising cement, at least one first superplasticizer, a calcium salt, and at least one second superplasticizer different from the first superplasticizer and comprising a main chain and pendant groups connected to the main chain adapted so as to separate from the main chain in a basic medium, wherein the result is that the second plasticizer has a fluidifying action which increases at least temporarily over time in a basic medium.

Abstract: The present invention is mainly aimed at a set-accelerating admixture for hydraulic compositions comprising, in an aqueous solution: the reaction product of an alkanolamine with a concentrated strong acid; sulfate anions; and alkaline or earth alkaline cations; having a pH comprised between 5 and 12. Moreover it is directed to a method for its preparation as well as to a method for preparing hydraulic compositions comprising the step for adding such an admixture to the hydraulic binder, before, during or after the grinding.

Abstract: The invention relates to an emulsion consisting of an oily phase dispersed in an aqueous phase, comprising a non-quaternary amine surfactant and an acid with a set-retarding effect as well as to a method for its preparation. Moreover, it relates to a method for surface retarding of a hydraulic composition, comprising the steps of: (a) shaping the hydraulic composition; (b) applying onto the surface of the hydraulic composition, the emulsion according to the invention, which by breaking releases the oily phase; and (c) after hardening of the hydraulic composition, removing the film formed with the non-hardened hydraulic composition surface layer.

Abstract: The present invention relates to a system of adjuvants for concrete comprising a superplasticizer, such as a polyalkoxylated polycarboxylate comb polymer; an accelerator selected from calcium salts; and a rheology extender, which is a polyalkoxylated polyphosphonate. The system of adjuvants is particularly useful for prefabricated concrete, which is used for producing concrete building elements in series such as slabs, walls, beams, frontage panels. Methods for preparing prefabricated concrete using this system of adjuvants are also provided.

Abstract: The invention concerns a fast binder comprising; cement; at least one superplasticizer; calcium nitrite; and at least one formic derivative. The invention also concerns concrete mixtures obtained from said binder and methods for making same.

Abstract: The invention relates to an additive for reducing Cr(VI) ions to Cr(III) ions, comprising a complex of tin(II) and a carboxylic acid or a salt thereof, and to the process for the preparation thereof. It also relates to a process for preparing a material having a low chromium(VI) content. Finally, it relates to the use of said additive for reducing chromium(VI) ions to chromium(III) ions.

Abstract: The invention relates to an anti-filming surface adjuvant for hydraulic binders comprising at least one fat and at least one anti-caking agent, to its preparation method as well as to a method for preparing a hydraulic binder composition suitable for making screeds or self-compacting concretes (SCC) including the step consisting of adding to the hydraulic binder the adjuvant according to the invention at a dosage comprised between 50 and 1,500 g/m3 of screed or of concrete.

Abstract: The invention relates to a compound of following formula (I): the preparation method thereof and the use of same.

Abstract: The invention proposes an adjuvant system for a concrete comprising as a combination: (a) a superplasticizer (b) an accelerator; and (c) a rheology extender. A method for preparing prefabricated concrete is also proposed, comprising the step of adding in a suitable amount, respectively: (a) a superplasticizer; (b) an accelerator and (c) a rheology extender, simultaneously or successively to the concrete slurry. Finally the use of such a system for preparing prefabricated concretes is proposed.

Abstract: A fast hydraulic binder comprising cement, at least one first superplasticizer, a calcium salt, and at least one second superplasticizer different from the first superplasticizer and comprising a main chain and pendant groups connected to the main chain adapted so as to separate from the main chain in a basic medium, wherein the result is that the second plasticizer has a fluidifying action which increases at least temporarily over time in a basic medium.

Abstract: The invention relates to an additive for reducing Cr(VI) ions to Cr(III) ions, comprising a complex of tin(II) and a carboxylic acid or a salt thereof, and to the process for the preparation thereof. It also relates to a process for preparing a material having a low chromium(VI) content. Finally, it relates to the use of said additive for reducing chromium(VI) ions to chromium(III) ions.

Abstract: The invention concerns a fast binder comprising; cement; at least one superplasticizer; calcium nitrite; and at least one formic derivative. The invention also concerns concrete mixtures obtained from said binder and methods for making same.