Abstract: The invention relates to the use of branched copolymers as dispersants of mineral binders, wherein the copolymers are formed from (1) at least one olefinically unsaturated carboxylic acid monomer (2) at least one olefinically unsaturated macromonomer of the general structure (I) where R1 is an olefinically unsaturated radical which has 2-10 carbon atoms and may optionally be substituted by oxygen and/or nitrogen, preferably vinyl, allyl, methallyl, vinyloxybutyl, isoprenyl, acryloyl and/or methacryloyl, X=O or NH, A is in each case independently C1-C10 alkylene, preferably ethylene, propylene and/or butylene, R2=C1-C16 alkyl, B is in each case independently C1-C10 alkylene, preferably ethylene, propylene and/or butylene, m is in each case independently an integer in the range of 0-350, preferably 2-200, more preferably 5-150, especially 7-30, n is an integer in the range of 0-100, preferably 1-100, more preferably 2-75, most preferably 5-55, p is 0 or 1, preferably 0, o is an integer in the range

Abstract: A process for the production of backfilling pastes for underground operations, the process including or essentially consisting of the mixing of a) cement, b) tailings from underground operations, c) optionally extra water, d) at least one polycarboxylate ether, and e) calcium hydroxide; and a method for controlling the flow of a backfilling paste for underground operations, the method including at least one step of admixing an admixture including at least one polycarboxylate ether and calcium hydroxide to a mixture of cement, tailings, and water.

Abstract: A method for characterizing sands with regard to adsorption of plasticizing additives includes: providing an aqueous mixture of the plasticizing additive with a defined concentration of the plasticizing additive; determination of a characteristic of the aqueous mixture whereby the characteristic is related to the proportion of the plasticizing additive in the aqueous mixture; contacting a sample of sand to be analyzed with the aqueous mixture or a sample thereof, so that the sand sample is completely immersed in the aqueous mixture or the sample thereof; taking a sample of supernatant liquid from the mixture of step; determination of the same characteristic as in step b) of the sample of supernatant liquid; and comparing the characteristic obtained in step b) with the characteristic of step e) in order to decide whether the characteristics differ from each other by more than a predefined threshold or not.

Abstract: An aqueous suspension including 5 to 65 wt. % of calcium hydroxide, wherein at least 50 wt. % of the calcium hydroxide is present in the form of nanoparticles, and at least one compound for stabilizing the suspension. The aqueous suspension accelerates the setting of mineral binder compositions without adversely affecting the processing properties of the composition.

Abstract: A comb polymer is used as an inerting agent for swelling clays and/or non-swelling clays in gypsum compositions, the comb polymer includes: a) at least one poly(alkylene oxide) side chain-bearing monomer unit M1 without ionic groups, b) optionally at least one cationic monomer unit MC, wherein the molar ratio of the cationic monomer units MC to the side chain-bearing monomer units M1 is equal to or less than 10, c) optionally at least one anionic monomer unit MA, wherein the molar ratio of the anionic monomer units MA to the side chain-bearing monomer units M1 is less than 1, preferably equal to or less than 0.5, d) optionally, at least one non-ionic monomer unit M3, wherein the molar ratio of the non-ionic monomer units M3 to the side chain-bearing monomer units M1 is less than 5.

Abstract: A method for increasing the workability of a binder composition including calcined clay, limestone, and Portland cement. The method includes a step of adding an admixture comprising at least one PCE and at least one additive selected from the group including sugar acids, sugars, sugar alcohols, and hydroxycarboxylic acids. The invention also relates to an admixture to be used in said method and hardenable compositions, especially concrete and mortar, obtainable by the method.

Abstract: The use of branched copolymers of the general structure (I) as additives for increasing the flow rate and for reducing the viscosity of mineral binder compositions.

Abstract: A method includes adding (i) a comb polymer and (ii) a plasticizer to a mineral binder composition comprising swellable clays. The comb polymer includes: at least one poly(alkylene oxide) side chain-bearing monomer unit without ionic groups, optionally at least one cationic monomer unit, optionally at least one anionic monomer unit, and optionally, at least one non-ionic monomer unit, wherein a molar ratio of the cationic monomer units to the side chain-bearing monomer units is equal to or less than 10, a molar ratio of the anionic monomer units to the side chain-bearing monomer units is less than 1, and a molar ratio of the non-ionic monomer units to the side chain-bearing monomer units is less than 5.

Abstract: Methods of obtaining aggregates and/or pulverulent mineral material from a starting material comprising hardened mineral binder and aggregates utilizing process auxiliaries selected from the group consisting of polycarboxylate ethers and/or esters (PCE), glycols, organic amines, especially alkanolamines, ammonium salts of organic amines with carboxylic acids, surfactants, especially nonionic surfactants, gemini surfactants, calcium stearate, alkoxylated phosphonic or phosphoric esters, propane-1,3-diol, carboxylic acids, sulfonated amino alcohols, boric acid, salts of boric acid, borax, salts of phosphoric acid, gluconate, iron sulfate, tin sulfate, antimony salts, alkali metal salts, alkaline earth metal salts, lignosulfonates, glycerol, melamine, melamine sulfonates, water absorbents in the form of a superabsorbent polymer or in the form of a sheet silicate, anticaking agents, sugars, sugar acids, sugar alcohols, phosphates, phosphonates, and mixtures thereof.

Abstract: Use of a comb polymer as an inerting agent for non-swelling layer-silicates, the comb polymer including: a) at least one poly(alkylene oxide) side chain-bearing monomer unit M1 without ionic groups, b) optionally at least one cationic monomer unit MC, wherein the molar ratio of the cationic monomer units MC to the side chain-bearing monomer units M1 is equal to or less than 0.1, preferably less than 0.05, c) optionally at least one anionic monomer unit MA, wherein the molar ratio of the anionic monomer units MA to the side chain-bearing monomer units M1 is less than 1, preferably equal to or less than 0.5, and c) optionally at least one non-ionic monomer unit M3, wherein the molar ratio of the non-ionic monomer units M3 to the side chain-bearing monomer units M1 is less than 7, preferably equal to or less than 3.

Abstract: A comb polymer, in particular for use as a clay-inerting agent, including: a) at least one poly(alkylene oxide) side chain-bearing monomer unit M1 without ionic groups, b) optionally at least one cationic monomer unit MC, c) optionally at least one anionic monomer unit MA, d) optionally, at least one non-ionic monomer unit M3, wherein the molar ratio of the cationic monomer units MC to the side chain-bearing monomer units M1 is equal to or less than 10, the molar ratio of the anionic monomer units MA to the side chain-bearing monomer units M1 is less than 1, preferably equal to or less than 0.5, and the molar ratio of the non-ionic monomer units M3 to the side chain-bearing monomer units M1 is less than 5.

Abstract: A combination of retarders and regulators for hydration reaction of cementitious binders including clinkers based on Ye'elimite. Set retarders are calcium complexing agents, consisting of sugar acids, sugars, sugar alcohols, hydroxycarboxylic acids, phosphates, phosphonates, borates and amines. Regulator general formula (I) is where M is H, NH4 or chosen from monovalent or divalent metal of groups Ia, IIa, IIIa, Ib, IIb, IVb, VIb, VIIb or VIIIb of periodic table of elements, where M is a divalent metal, a second equivalent of R—SO3 is present, and M is chosen from group consisting of H, NH4, Li, Na, K, MgX, CaX, or NiX with X?RSO3, and R is chosen from H, NH2, OH or from hydrocarbon chain with 1-18 C atoms which may be substituted by N and/or O and/or which may be linear or branched and/or which contain one or more unsaturated bonds and/or cycloaliphatic and/or aromatic moieties.

Abstract: A block copolymer for use as a dispersant for mineral binder compositions, containing an alkali activating agent. The block copolymer includes at least one first block A and at least one second block B, the first block A containing a monomeric unit M1 and the second block B containing a monomeric unit M2. A proportion of monomeric units M2, if any, in the first block A is less than 25 mol %, in particular less than or equal to 10 mol %, relative to all the monomeric units M1 in the first block A, and a proportion of monomeric units M1, if any, in the second block B is less than 25 mol %, in particular less than or equal to 10 mol %, relative to all the monomeric units M2 in the second block B.

Abstract: An aqueous suspension including 5 to 65 wt. % of calcium hydroxide, wherein at least 50 wt. % of the calcium hydroxide is present in the form of nanoparticles, and at least one compound for stabilizing the suspension. The aqueous suspension accelerates the setting of mineral binder compositions without adversely affecting the processing properties of the composition.

Abstract: A copolymer as dispersant in a binder composition comprising an alkaline activating agent, wherein the activating agent is especially suitable for activation of a latently hydraulic and/or pozzolanic binder, wherein the copolymer has a polymer backbone and side chains bonded thereto and comprises at least one ionizable monomer unit M1 and at least one side chain-bearing monomer unit M2, and wherein the copolymer has a gradient structure in at least one section A in a direction along the polymer backbone with regard to the ionizable monomer unit M1 and/or with regard to the side chain-bearing monomer unit M2.

Abstract: A block copolymer, in particular for use as a dispersant for mineral binder compositions, including at least one first block A and at least one second block B, wherein the first block A has a monomer unit M1 and the second block B has a monomer unit M2. To this end a proportion of monomer units M2 which is in any case present in the first block A is less than 25 mol %, in particular less than or equal to 10 mol %, based on all the monomer units M1 in the first block A and a proportion of monomer units M1 which is in any case present in the second block B is less than 25 mol %, in particular less than or equal to 10 mol %, based on all the monomer units M2 in the second block B.

Abstract: The present invention relates to admixtures, especially a dispersant for solid particles, in particular a dispersant for mineral binder compositions, comprising: a) a superplasticizer and b) a copolymer having a polymer backbone and side chains bonded thereto, comprising at least one ionizable monomer unit M1 and at least one side chain-bearing monomer unit M2, wherein the copolymer has a nonrandom distribution of the monomer units M1 and/or the monomer units M2 in a direction along the polymer backbone, and wherein the superplasticizer and the copolymer differ from a chemical and/or structural point of view.

Abstract: A copolymer, in particular a dispersant for solid particles, in particular a dispersant for mineral binder compositions, including a polymer backbone and sidechains bound thereto. Said copolymer includes at least one phosphorus group-carrying monomeric unit M1 and at least one sidechain-carrying monomeric unit M2, the copolymer having, in a direction along the polymer backbone, a non-random distribution of the monomeric units M1 and/or of the monomeric units M2.

Abstract: A comb polymer is used for increasing the flow rate and/or reducing the viscosity of a mineral binder composition, where the comb polymer has a main chain including acid groups and there are pendent chains linked to the main chain, and where the average number-average molar mass of all of the pendent chains is from 120 to 1000 g/mol and the molar ratio of the acid groups to the side chains is in the range from 0.5 to 2.

Abstract: The present invention relates to admixtures, especially a dispersant for solid particles, in particular a dispersant for mineral binder compositions, comprising: a) a superplasticizer and b) a copolymer having a polymer backbone and side chains bonded thereto, comprising at least one ionizable monomer unit M1 and at least one side chain-bearing monomer unit M2, wherein the copolymer has a nonrandom distribution of the monomer units M1 and/or the monomer units M2 in a direction along the polymer backbone, and wherein the superplasticizer and the copolymer differ from a chemical and/or structural point of view.