摘要:
A dispersion which is free of binders and which contains titanium dioxide and at least one water-soluble poly- carboxylate ether, where - the titanium dioxide has a BET surface area of 20 to 400 m2/g, the water-soluble polycarboxylate ether is a copolymer based on at least one oxyalkylene glycol compound and at least one unsaturated monocarboxylic acid derivative or dicarboxylic acid derivative, the dispersion has a content of titanium dioxide of 5 to 50% by weight, based on the total amount of the dispersion.
摘要:
A process for the preparation of products of high early strength comprising hydraulic binders, in which a hydraulic binder, water and 0.1 to 5% by weight, based on the hydraulic binder, of a finely divided titanium dioxide are mixed with agitation and in any desired sequence.
摘要:
The invention relates to a dispersion which is free of binders and which contains silica and at least one flow agent, the silica being a precipitated silica having a surface area greater than 50 m²/g, the aggregates and/or agglomerates in the dispersion having an average diameter of less than 1 µm and the content of silica being 5 to 50% by weight, based on the total amount in the dispersion. The invention also relates to a method for producing the same and to its use as a concrete admixture in cementitous preparations.
摘要:
A dispersion which is free of binders and which contains silicon dioxide and at least one water-soluble polycarboxylate ether, where - the silicon dioxide is a pyrogenic silicon dioxide which is present in the form of aggregated primary particles having a BET surface area of 50 to 250 m2/g, and - the aggregates in the dispersion have a mean diameter of less than 1 μm, - based on the total amount of the dispersion, - the water-soluble polycarboxylate ether is a copolymer based on at least one oxyalkylene glycol compound and at least one unsaturated monocarboxylic acid derivative or dicarboxylic acid derivative, - the weight ratio of polycarboxylate ether/silicon dioxide is 0.01 to 100.