Construction Research & Technology Gmbh

Degussa Construction Chemicals Gmbh

Swk Bauchemie Gmbh

Hubert Leitner

Gerhard Albrecht

Alfred Kern

Luc Nicoleau

Josef Weichmann

Klaus Lorenz

Christoph Hesse

Mario Vierle

Michael Kutschera

Sabrina Montero Pancera

Eva Jetzlsperger

Thomas Wohlhaupter

Reinhard Dorfner

Dirk Schmitt

Siegfried Zuern

Daniel Fridrich

Michael Braeu

Harald Grassl

Siegfried Zürn

Christian H&uuml;bsch

Michael BRÄU

The invention concerns a process for the for the preparation of a hardening accelerator composition by reaction of a water-soluble calcium compound with a water-soluble silicate compound, the reaction being carried out in the presence of an aqueous solution which contains a plasticizer suitable for hydraulic binders, characterized in that said reaction is being carried out in the presence of apatite and that the molar ratio of calcium to phosphor in the hardening accelerator is from 25/1 to 400/1.

Hardening accelerator composition for cementitious compositions

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 by reaction of a calcium compound with a silicon dioxide containing component under alkaline conditions, in both cases the reaction being carried out in the presence of a polycondensate containing at least one structural unit consisting of an aromatic or heteroaromatic moiety bearing a polyether side chain and at least one structural unit consisting of an aromatic or heteroaromatic moiety bearing at least one phosphoric acid ester group and/or its salt. The invention concerns a composition of calcium silicate hydrate and the polycondensate, its use as hardening accelerator and for the reduction of the permeability of hardened compositions.

Hardening accelerator composition containing phosphated polycondensates

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.

Plasticizer-containing hardening accelerator composition

Copolymers based on unsaturated monocarboxylic or dicarboxylic acid derivatives, oxyalkylene glycol alkenyl ethers, vinylic polyalkylene glycol, polysiloxane or ester compounds and the use thereof as additives for aqueous suspensions based on mineral or bituminous binders are described. The copolymers give aqueous suspensions of building materials excellent processing properties even in very small amounts, without delaying strength developments. In addition, when the copolymers of the invention are used, a drastic decrease in the water/binder ratio still leads to highly fluid building materials without segregation of individual constituents from the building material mixture occurring.

Copolymers based on unsaturated mono-or dicarboxylic acid derivatives and oxyalkylene glycol alkenyl ethers, method for the production and use thereof

Powdery polyether carboxylate-based polymeric compositions

Copolymers based on unsaturated dicarboxylic acid derivatives, oxyalkylene glycol alkenyl ethers, unsaturated dicarboximides and/or -amides and vinyl monomers are described, as also their use as additives for hydraulic binders, especially cement. The copolymers also have an excellent plasticizing effect&mdash;even if they are added in large quantities&mdash;when used in concrete mixtures with an extremely low water content, and they do not retard the setting process.

Copolymers based on unsaturated dicarboxylic acid derivatives and oxyalkylene glycol alkenyl ethers

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Traunwalchen, Germany

Hubert Leitner