Process for accelerating the setting and hardening of a...

Details Process for accelerating the setting and hardening of a... Process for accelerating the setting and hardening of a...

C - Chemistry, Metallurgy

04

B

C04B 22/14 (2006.01) C04B 28/02 (2006.01)

Patent

CA 2137309

In a process for accelerating the setting and hardening of a material which contains a hydraulic binder or which consists of a hydraulic binder there is used a setting accelerating mixture which is free of alkali metals and free of chlorides. Said setting accelerating mixture contains at least one water soluble sulfate of a polyvalent cation and a further constituent which is selected from the group consisting of calciumaluminate, calciumsulfoaluminate, basic aluminum salts, mixtures thereof or mixtures containing at least one of said constituents and a further component. If the water soluble sulfate of the polyva-lent cation is aluminumsulfate then said compound has to contain crystal water in order to provide the water so-lubility of said product. With the setting accelerating mixtures a fast gaining of strength of a corresponding mortar or concrete is achieved and the finally hardened product has better mechanical characteristics than corresponding products prepared without the adding of any set accelerating ad-mixture.

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