SOLIDIFYING AND HARDENING ACCELERATOR FOR HYDRAULIC BINDERS

摘要

A novel setting and hardening accelerator for hydraulic binders, as well as the corresponding mortars and concretes, is produced by reaction, at up to 150[deg]C in water, of (a) a basic aluminium salt and/or aluminium hydroxide, (b) aluminium sulphate and/or sulphuric acid, (c) organic carboxylic acids or their mixtures, (d) aluminium salts of the organic carboxylic acids and (e) organic and/or inorganic sulphates, hydrogen sulphates, carbonates, hydrogen carbonates, alkaline earth oxides and/or alkaline earth hydroxides. A solution is obtained in which all or selected components react together (optionally with the exception of component (e) which may dissolve in the reaction product) so that the end product has an aluminium to sulphate molar ratio of 0.83-13.3 and an aluminium to organic carboxylic acid molar ratio of 0.67-33.3.