Construction Research & Technology Gmbh

Evonik Degussa Gmbh

Goldschmidt Gmbh

Stefanie Scheul

Harald Grassl

Gerhard Albrecht

Alexander Kraus

Alfred Kern

Angelika Hartl

Philipp Wieland

Ulrich Fischer

Kerstin Becher

Eva Jetzlsperger

Christian Huebsch

Christian Hübsch

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 use of block copolymers which were prepared by polymerization of a poly(alkylene oxide) compound (A) with at least one ethylenically unsaturated monomer compound (B), as dispersants for aqueous suspensions of solids, in particular based on hydraulic binders, such as, for example, cement, lime, gypsum or anhydrite, is described. Surprisingly, these block copolymers have a substantially better water-reducing power at the same dose in comparison with conventional superplasticizers based on comb polymers. Moreover, the slump loss can also be reduced in comparison with conventional superplasticizers by modification of the adhesive block.

Use of block copolymers as dispersants for aqueous suspensions of solids

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Trostberg, Germany

Stefanie Scheul