Sika Technology Ag

Christian Buerge

Franz Wombacher

Ueli Sulser

Beat Marazzani

Christophe Kurz

Dieter Honert

Gilbert Maeder

Oliver Blask

The invention relates to additives for hydraulic binders and systems produced from them, such as concrete and mortar. In particular, the present invention relates to a setting and hardening accelerator for hydraulic binders produced by means of reaction of a calcium compound CV with a silicon compound SV and addition of a phosphonic acid derivative, as well as its production.

Accelerator for hydraulic binders

This disclosure relates to stabilizing polycarboxylates, such polycarboxylate ethers, in a presence of an inorganic powder at an elevated temperatures by using at least one antioxidant.

Method for stabilizing polycarboxylates

Exemplary embodiments as disclosed herein are directed to setting and curing accelerators for hydraulic binders, including at least one ester of a polyhydric alcohol with an acid and/or salts thereof, where the acid is a phosphoric acid, phosphorous acid or a Cto Ccarboxylic acid. Compositions including at least one accelerator as disclosed herein can accelerate the setting and curing of hydraulic binders and mortar or concrete produced therefrom, such as quick-setting cement. Methods for accelerating the setting and curing of hydraulic binders and mortar or concrete produced therefrom are also disclosed.

Additive for hydraulic binding agent with long processing time and high early strength

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Schafisheim, Switzerland

Christian Buerge