Förfarande för framställning av ett efter blandning i vatten snabbt härdbart hydrauliskt bindemedel

摘要

Method of making a rapidly hardening hydraulic binder for mixing with water, the hardened mass produced therefrom having a defined water resistance. Calcium sulphate alpha -hemihydrate is used as the rapidly hardening component in a predetermined starting quantity, the hardened mass thereof having a time-dependent water resistance curve which, starting from a high initial strength value of the rapid hardening, shows a negative slope in the first twentyeight days. Granulated blast-furnace slag is admixed to the calcium sulphate alpha -hemihydrate. The quantity of granulated blast-furnace slag is matched to the starting quantity of calcium sulphate alpha -hemihydrate in such a way that, after the rapid hardening, formation of crystalline ettringite and formation of calcium hydrosilicate phases occurs and the time-dependent water resistance curve of the hardened mixture shows a constant positive slope in the first twentyeight days.