Aqueous accelerator mixture
AssigneeConstruction Research & Technology GmbH
InventorMartin Weibel
Life of this patent
Estimating the term…
Abstract
The invention relates to an accelerator, preferably for sprayed concrete or sprayed mortar, which is present as an aqueous mixture, preferably dispersion, particularly preferably suspension, which contains the following: (a) aluminium in oxidation state 3, (b) sulphate, (c) fluoride, and/or (semi)metal fluoro complexes, (d) stabiliser, preferably inorganic stabiliser, particularly preferably magnesium silicate and/or kaolin and/or clay minerals and/or allophane, in particular magnesium silicate and/or bentonite, particularly preferably sepiolite, especially particularly preferably Si12Mg8O30(OH)4(OH2)4 and/or Mg4Si6O15(OH)2.
Claims27
Accelerator which is present as an aqueous mixture which contains the following:
- (a) between 4 and 10% by weight of aluminium in oxidation state 3,
- (b) between 20 and 34% by weight of sulphate,
- (c) a fluorine proportion from fluoride and/or (semi)metal fluoro complexes of between 0.1 and 3% by weight, and
- (d) a magnesium silicate stabiliser,
- based in each case on the total weight of the aqueous mixture.
Process for the preparation of an accelerator which is present as an aqueous mixture, wherein
- (i) aluminium sulphate,
- (ii) aluminium hydroxide,
- (iii) hydrofluoric acid and/or fluoride-containing salts and/or (semi)metal fluoro complexes and
- (iv) magnesium silicate are mixed with water,
- wherein the mixture contains:
- (a) between 4 and 10% by weight of aluminium in oxidation state 3,
- (b) between 20 and 34% by weight of sulphate, and
- (c) a fluorine proportion of between 0.1 and 3% by weight,
- based in each case on the total weight of the aqueous mixture.
Accelerator which is present as an aqueous mixture which contains the following:
- (a) aluminium in oxidation state 3,
- (b) sulphate,
- (c) fluoride and/or (semi)metal fluoro complexes, and
- (d) between 0.1 and 10% by weight of magnesium silicate, and
- (e) between 0 and 20% by weight of amine,
- based in each case on the total weight of the aqueous mixture.
Accelerator which is present as an aqueous mixture which contains the following:
- (a) aluminium in oxidation state 3,
- (b) sulphate,
- (c) fluoride and/or (semi)metal fluoro complexes, and
- (d) a magnesium silicate stabiliser,
- based in each case on the total weight of the aqueous mixture, wherein the molar ratio of aluminium to sulphate in the mixture is between 1.3:1 and 0.7:1 and the accelerator contains between 24 and 40% by weight of aluminium sulphate, based on the total weight of the aqueous mixture.
Dependencies are inferred from the claim text.