Use of a hydraulic binder containing calcium aluminate for the production of a construction material

Abstract

The invention relates to the use of a hydraulic binder containing calcium aluminate, obtainable by a method in which a) prepared amorphous residual material rich in aluminium oxide and/or aluminium hydroxide is heated after the addition of a b) calcium ion-containing binder component and c) water, for the production of a constructing material.

Claims

1. A method for producing a hydraulic binder containing calcium aluminate and not containing Portland cement, comprising heating a processed amorphous alumina-rich or alumina-hydroxide-rich residue after addition of a calcium ion-containing binder component and water wherein the processed amorphous alumina-rich or alumina-hydroxide-rich residue is formed in the form of a drinking water treatment residue, wherein the amount of the sum of alumina and alumina-hydroxide of the residue in relation to the dry content is >50 wt.-%.

2. The method according to claim 1, wherein the processed amorphous alumina-rich or alumina-hydroxide-rich residue has a degree of crystallization of less than 25%.

3. The method according to claim 1, wherein in that the hydraulic binder containing calcium aluminate has a residual proportion of organic material.

4. The method according to claim 1, wherein the hydraulic binder containing calcium aluminate is substantially anhydrous.

5. The method according to claim 1, wherein the hydraulic binder containing calcium aluminate has a particle size of less than 100 m.

6. The method according to claim 1, wherein the hydraulic binder containing calcium aluminate is formed in the form of a constructing material.

7. The method according to claim 6, wherein the constructing material further comprises an ettringite former.

8. The method according to claim 6, wherein the constructing material further comprises a filler.

9. The method according to claim 8, wherein the filler is formed in the form of limestone powder, quartz sand, marble, chalk, clay, marl, or talc filler.

10. The method according to claim 6, wherein the constructing material further comprises additives.

11. The method according to claim 10, wherein the additives are in the form of liquefiers, retarders, accelerators, actuators, stabilizers, defoamers or sealants.

12. The method according to claim 6, wherein the constructing material further comprises an epoxy resin and an epoxy hardener.

13. The method according to claim 6, wherein the constructing material further comprises plastic dispersion powder.

14. The method according to claim 13, wherein the plastic dispersion powder is formed on the basis of vinyl or acrylate polymers.

15. The method according to claim 6, wherein the constructing material further comprises a fibrous material.

16. The method according to claim 15, wherein the fibrous material has fibres of a length of up to 2 mm.

17. The method according to claim 6, wherein the constructing material is formed in the form of a screed, mortar, filler or tile adhesive.

Description

EXAMPLES OF EMBODIMENTS

(1) Some exemplary formulations (dry compositions) for constructing materials according to the invention are given below, which can be prepared starting from the use of the hydraulic binder containing calcium aluminate according to the invention (hydraulic binder I) with the addition of the further components listed. The corresponding ready-to-use constructing material can then be produced from these proposed dry compositions by adding water. The proportion of water in this case can preferably be 10-150 wt. % relative to the total dry mass of the constructing materials. The designation hydraulic binder I is intended to distinguish the hydraulic binder containing calcium aluminate according to the invention in particular from other hydraulic binders, such as Portland cement or alumina cement.

(2) Tile Adhesive:

(3) Hydraulic binder I: 30 wt. % Portland cement: 15 wt. % Sand: 51.6 wt.-% Accelerator: 1 wt. % Cellulose ether: 0.5 wt. % Dispersible powder: 1.8 wt. % Fibrous material: 0.1 wt. %
Putty: Hydraulic binder I: 16.5 wt. % Portland cement: 5.5 wt. % Alumina cement: 5 wt. % CaSO4--hemihydrate: 9 wt. % Sand: 26 wt. % Limestone powder: 24 wt. % Lightweight aggregates: 10 wt. % Dispersible powder: 3 wt. % Casein: 0.2 wt. % Condenser: 0.5 wt. % Stabilizer: 0.02 wt. % Retardant: 0.07 wt. %
Screed: Hydraulic binder I: 11.6 wt. % Alumina cement: 4 wt. % Portland cement: 10.4 wt. % CaSO4--hemihydrate: 11 wt. % Sand: 62 wt. % Superplasticizer: 0.05 wt. % Setting accelerator: 0.15 wt. % Retardant: 0.1 wt. %
Synthetic Resin Mortar: Hydraulic binder I: 29.2 wt. % Synthetic resin: 30 wt. % Hardener: 3.3 wt. % CaSO4--hemihydrate: 14.6 wt. % Alumina cement: 17.3 wt. % Portland cement: 4.8 wt. % Setting accelerator: 0.4 wt. % Retardant: 0.26 wt. %

(4) The constructing materials according to the invention listed in the embodiments are not only versatile in use and simple and inexpensive to produce, but also simultaneously make a contribution to sustainable construction, which is provided in particular by the fact that resources are conserved for the production of the constructing materials by using residual or waste materials for production, which would otherwise have to be disposed of in an elaborate and cost-intensive manner.