Patent ID: 6692564
Filing Date: 2004-02-17
Classification: C04B

Abstract:
A method of preparing an accelerator for sprayed concrete, consisting essentially of the steps of:(i) dissolving aluminum sulphate and aluminum hydroxide in water, containing at least one amine dissolved therein, to give a clear solution; and (ii) optionally adding at least one of at least stabilizer and at least one defoaming agent; wherein the proportions of ingredients present being such that the final product contains from 3%-12% by weight of aluminum sulphate (measured as Al2O3), up to 30% by weight of amorphous aluminum hydroxide, 4-7% by weight amine, up to 3% by weight defoaming agent and up to 0.06 mol/kg, stabilizer, being selected from the group consisting of hydroxycarboxylic acids, phosphoric acids and non-alkaline salts of phosphoric acids.