Back to results
US 6,692,564 B2Granted
Preparation of concrete accelerator
AssigneeMBT Schweiz AG
InventorThomas Hofmann
Life of this patent
Estimating the term…
Abstract
An alkali-free accelerator for sprayed concrete is prepared by dissolving aluminium sulphate and amorphous aluminium hydroxide in water which optionally contains one amine, and optionally adding at least one stabiliser, selected from hydroxycarboxylic acid and phosphoric acids and non-alkaline salts thereof, and at least one defoaming agent.
Claims13
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.
1 more element
Dependencies are inferred from the claim text.