Hardening accelerator composition containing phosphated polycondensates

US9045377B2 · kind B2 · utility

Assignee

• CONSTRUCTION RESEARCH & TECHNOLOGY GMBH · DE

Inventors

• Luc Nicoleau · Fleury-les-Aubrais, FR
• Gerhard Albrecht · Prien am Chiemsee, DE
• Klaus Lorenz · Zangberg, DE
• Eva Jetzlsperger · Garching bei München, DE
• Daniel Fridrich · Tönning, DE
• Thomas Wohlhaupter · Burg (Dithmarschen), DE
• Reinhard Dorfner · Kirchweidach, DE
• Hubert Leitner · Traunwalchen, DE
• Mario Vierle · Günzburg, DE
• Dirk Schmitt · Sulzburg, DE
• Michael Braeu · Traunstein, DE
• Christoph Hesse · Ebersberg, DE
• Sabrina Montero Pancera · Viernheim, DE
• Siegfried Zuern · Eurasburg, DE
• Michael Kutschera · Neustadt, DE

Key dates

• Filing date: Aug 12, 2010
• Grant date: Jun 2, 2015
• Expiry date: Sep 28, 2031

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B2103/14
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

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.