A hydraulic composition is prepared by mixing (A) an admixture aqueous solution containing a water-soluble salt which is a water-reducing agent or setting retarder, and a water-soluble cellulose ether with (B) a fresh concrete composition containing a hydraulic substance, an aggregate, and water at job site. The method is effective for preventing the admixture solution from thickening even though the water-soluble cellulose ether without glyoxal treatment is used.

A gypsum board according to the invention comprises calcium sulphate dihydrate; Tartaric acid in an amount in the range of 0.01 to 0.1% w based on the weight of calcium sulphate hemihydrate; A fluidizer in an amount of 1.0 to 10.0 kg/m.sup.3; Starch in an amount of 3.0 to 12.0 kg/m.sup.3.

A gypsum board according to the invention comprises calcium sulphate dihydrate; Tartaric acid in an amount in the range of 0.01 to 0.1% w based on the weight of calcium sulphate hemihydrate; A fluidizer in an amount of 1.0 to 10.0 kg/m.sup.3; Starch in an amount of 3.0 to 12.0 kg/m.sup.3.

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.

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.

The present invention provides a composition and method for controlling air voids in aqueous systems such as paints, coatings, sealants, adhesives, mastics, cements, mortar, masonry, or concrete, which comprises the reaction product of an oxidizing agent and a compound comprising at least one polyalkoxylated polyalkylene polyamine, at least one polyalkyoxylated polyethyleneimine, or a mixture thereof.

The present invention provides a composition and method for controlling air voids in aqueous systems such as paints, coatings, sealants, adhesives, mastics, cements, mortar, masonry, or concrete, which comprises the reaction product of an oxidizing agent and a compound comprising at least one polyalkoxylated polyalkylene polyamine, at least one polyalkyoxylated polyethyleneimine, or a mixture thereof.

A binder composition in dry weight percentage comprising a) between 1% and 30% of Portland cement, lime or a mixture thereof, b) between 1% and 40% of ground granulated blast furnace slag, c) between 20% and 50% of at least one pozzolanic material, d) between 20% and 65% of at least one filler, e) between 0.5% and 10%, relative to the total weight of components a, b, c, and d, of at least one activator, f) between 0.05% and 1.5%, relative to the total weight of components a, b, c and d, of at least one water reducer polymer, the filler being a mixture between 10% and 90% in weight of particles having a d.sub.50?0.05 ?m and <8 ?m, and between 10% and 90% in weight of particles having a d.sub.50?8 ?m and <200 ?m, the filler mixture weight percentages in respect to total weight of the filler.

A binder composition in dry weight percentage comprising a) between 1% and 30% of Portland cement, lime or a mixture thereof, b) between 1% and 40% of ground granulated blast furnace slag, c) between 20% and 50% of at least one pozzolanic material, d) between 20% and 65% of at least one filler, e) between 0.5% and 10%, relative to the total weight of components a, b, c, and d, of at least one activator, f) between 0.05% and 1.5%, relative to the total weight of components a, b, c and d, of at least one water reducer polymer, the filler being a mixture between 10% and 90% in weight of particles having a d.sub.50?0.05 ?m and <8 ?m, and between 10% and 90% in weight of particles having a d.sub.50?8 ?m and <200 ?m, the filler mixture weight percentages in respect to total weight of the filler.

A binder composition in dry weight percentage comprises a) between 1% and 30% of at least one lime source, b) between 5% and 75% of ground granulated blast furnace slag, (c) between 20% and 90% of at least one filler, (d) between 0.1% and 5% of SO.sub.3.sup.?, e) between 0.1% and 1% of at least one water reducer polymer, f) between 0% and 2%, relative to the total weight of components a, b and c, of at least one activator different from d, the weights of d, e, f relative to the total weight of components a, b, c, said ground granulated blast furnace slag and the filler each being a mixture of two differently sized particles, the different sizes based on d.sub.50 and range of between 1 ?m and 5 ?m and >5 ?m for the slag and between 0.05 ?m and <8 ?m and ?8 ?m and <200 ?m for the filler.