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AssigneeConstruction Research & Technology GmbH
InventorsLuc Nicoleau, Gerhard Albrecht, Klaus Lorenz, Eva Jetzlsperger, Daniel Fridrich, Thomas Wohlhaupter, Reinhard Dorfner, Hubert Leitner, Mario Vierle, Dirk Schmitt, Michael Braeu, Christoph Hesse, Sabrina Montero Pancera, Siegfried Zuern, Michael Kutschera
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The invention concerns a process for the preparation of a hardening accelerator composition by reaction of a water-soluble calcium compound with a water-soluble silicate compound and a process for the preparation of a hardening accelerator composition by reaction of a calcium compound with a silicon dioxide containing component under alkaline conditions, in both cases the reaction of the water-soluble calcium compound with the water-soluble silicate compound being carried out in the presence of an aqueous solution which contains a water-soluble comb polymer suitable as a plasticizer for hydraulic binders. The invention concerns also a composition of calcium silicate hydrate and comb polymer, its use as hardening accelerator and for the reduction of the permeability of hardened compositions.
A process for the preparation of a hardening accelerator composition by reaction of a water-soluble calcium compound with a water-soluble silicate compound, the reaction of the water-soluble calcium compound with the water-soluble silicate compound being carried out in the presence of an aqueous solution which contains a water-soluble comb polymer suitable as a plasticizer for hydraulic binders, wherein the composition is free of cement and the water-soluble calcium compound is used in an amount of 0.01 to 51% by weight based on the total weight of the water-soluble calcium compound, the water-soluble silicate compound, the water-soluble comb polymer and water.
The process for the preparation of a hardening accelerator composition by reaction of a calcium compound, with a silicon dioxide containing component under alkaline conditions, wherein the reaction is carried out in the presence of an aqueous solution of a water-soluble comb polymer suitable as a plasticizer for hydraulic binders, wherein the composition is free of cement and the molar ratio of calcium from the calcium compound to silicon from the silicon dioxide containing component is from 1.1 to 1.8.
A composition, comprising a water-soluble comb polymer suitable as plasticizer for hydraulic binders and calcium silicate hydrate particles with a particle diameter smaller than 500 nm, the particle size of the calcium silicate hydrate being measured by analytical ultracentrifugation.
Dependencies are inferred from the claim text.