Solidifying and hardening accelerator for hydraulic binders

A solidification and curing accelerator for hydraulic binders, produced by a process comprising:

• providing a reaction mixture comprising constituents (a) through (e) as follows:
• (a) at least one of basic aluminium salts which are substantially water insoluble and aluminium hydroxide;
• (b) at least one of aluminum sulfate which is substantially water soluble and sulfuric acid;
• (c) at least one of an organic carboxylic acid or mixtures of at least two organic carboxylic acids;
• (d) aluminum salts of organic carboxylic acids;
• and
• (e) at least one organic and inorganic substance selected from the group consisting of sulfates, hydrogen-sulfates, carbonates, hydrogen-carbonates, alkaline earth metal oxides, and alkaline earth metal hydroxides;
• adding water to the reaction mixture and reacting at a temperature ranging up to 150° C. for a time effective to provide a reaction product which is a solution in water and is effective as a solidification and curing accelerator for hydraulic binders,
• wherein the reaction product is characterized by one of (A) or (B) as follows:
• (A) either all constituents or a selection of constituents react with one another so that the reaction product has a molar ratio of aluminum to sulfate ranging from 0.83 to 13.3 and a molar ratio of aluminum to organic carboxylic acid ranging form 0.67 to 33.3 or
• (B) either all constituents except (e) or a selection of constituents except (e) react with one another so that the reaction product has a molar ration of aluminum to sulfate ranging from 0.83 to 13.3 and a molar ration of aluminum to organic carboxylic acid ranging from 0.67 to 33.3, and constituent (e) is dissolved in the reaction product.