Construction Research & Technology Gmbh

Kai Steffen Weldert

Klaus Lorenz

Tatiana Mitkina

Peter Schwesig

Wolfgang Seidl

Massimo Bandiera

Bernhard Sachsenhauser

Farra Ramzi

Davide Carnelli

Johanna Parks

Matthias Klein

Jasveer Ramroo Beni

Sabine Himmelein

A construction composition comprises a) a cementitious binder comprising one or more calcium silicate mineral phases and one or more calcium aluminate mineral phases; b) optionally, an extraneous aluminate source; c) a sulfate source; d) an ettringite formation controller comprising (i) glyoxylic acid, a glyoxylic acid salt and/or a glyoxylic acid derivative; and (ii) at least one of a borate source and a carbonate source; and e) a polyol in an amount of 0.2 to 2.5 wt.-%, relative to the amount of cementitious binder a). The composition contains 0.05 to 0.2 mol of total available aluminate, calculated as Al(OH), from the calcium aluminate mineral phases plus the optional extraneous aluminate source, per 100 g of cementitious binder a); and the molar ratio of total available aluminate to sulfate is 0.4 to 2.0. The construction composition exhibits high early strength and sufficient open time.

Construction composition

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Trostberg, Germany

Kai Steffen Weldert