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AssigneeSika AG, vorm. Kaspar Winkler & Co.
InventorsTheodor A. B urge, Klemens B osch, Dieter Mai
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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 accelerator 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 calcium aluminate, calcium sulfoaluminate, 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 polyvalent cation is aluminum sulfate, then said compound has to contain crystal water in order to provide the water solubility 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 then corresponding products prepared without the adding of any set accelerating admixture.
A process for accelerating the setting and hardening of a material which comprises a hydraulic binder by adding a setting accelerator comprising at least one component selected from the group consisting of calcium aluminate, calcium sulfoaluminate and a basic aluminum salt, wherein the setting accelerator is a mixture free of alkali metals and free of chlorides, and comprises
A process according to 1, wherein component (ii) comprises basic aluminum salt free of alkalimetal ions and selected from the group consisting of basic sulfates, nitrates, carbonates, and mixtures thereof.
A process according to 1, wherein component (i) comprises a member selected from the group consisting of water soluble aluminum sulfates which comprise, per mole of Al.sub.2 (SO.sub.4).sub.3, least six moles of water and sulfates of the cation Fe.sup.2+ and Fe.sup.3+, wherein the iron ion containing sulfates are free of crystal water, or contain crystal water, and mixtures thereof.
A setting and hardening accelerator for accelerating the hardening of a material which comprises a hydraulic binder, wherein the setting accelerator is a mixture free of alkali metals and chlorides, and comprises:
Dependencies are inferred from the claim text.