Construction Research & Technology Gmbh

Evonik Degussa Gmbh

Eva Jetzlsperger

Gerhard Albrecht

Klaus Lorenz

Christoph Hesse

Luc Nicoleau

Mario Vierle

Michael Kutschera

Hubert Leitner

Sabrina Montero Pancera

Reinhard Dorfner

Siegfried Zuern

Dirk Schmitt

Thomas Wohlhaupter

Michael Braeu

Daniel Fridrich

Harald Grassl

Philipp Wieland

Ulrich Fischer

Kerstin Becher

Christian Huebsch

Stefanie Scheul

Christian Hübsch

Siegfried Zürn

Michael BRÄU

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

Dispersion which is free of binders and which contains silica and at least one superplasticizer, the silica being a precipitated silica having a surface area greater than 50 m/g, the aggregates and/or agglomerates in the dispersion having a median diameter of less than 1 &#x3bc;m and the proportion of silica being from 5 to 50% by weight, based on the total amount of the dispersion, and a process for the preparation thereof and the use thereof as a concrete admixture in cement-containing preparations.

Aqueous dispersions of silica for increasing early strength in cementitious preparations

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

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Garching, Germany

Eva Jetzlsperger