DRY MIXTURE FOR REPAIR OF THE PRODUCTS MADE OUT OF CONCRETE Russian patent published in 2006 - IPC C04B28/30 

FIELD: building industry; production of construction materials on the basis of magnesia cements.

SUBSTANCE: the invention is pertaining to the field of building industry, in particular, to production of the construction materials based of magnesia cements and may be used at the urgent repairs of the concrete covering of the highways and runways of the aerodromes, and also at the redecorating repairs of the concrete structures surfaces. The technical result of the invention is preparation of the composition from the dry-mixture tempered by water, which after solidification has the heightened strength for bending and compression, that allows to apply it for the repair works at removal of defects of the concrete surfaces. The dry-mixture for repair of the items made out of the concrete contains the binding, the filler and the organic components. In the capacity of the binding it uses magnesium oxide and in the capacity of the organic components - a cellulose ester and the polymeric filaments. At that the mixture additionally contains the monosubstituted ammonium phosphate, aluminosilicate, expanded perlite and sodium tetraborate at the following ratio of the components ( in mass %): magnesium oxide - 9-23, the monosubstituted ammonium phosphate - 7-23, aluminosilicate - 12-32, sodium tetraborate - 0.2-1.4, the expanded perlite - 0.2-1.5, cellulose ester - 0,1-0.7, the polymeric filaments - 0.1-0.7 and the filler - the rest. In the capacity of the filler may be used sand or macadam, or the mixture of the macadam and the sand at their ratio from 1:1 up to 4:1. In the capacity of the cellulose ester may be used carboxymethylcellulose, or carboxyethylcellulose or methylcellulose or hydroxymethylcellulose. In the capacity of the polymeric filaments may be used the filaments based on cellulose or thee polytetraphthalate filaments, or the polyester filaments.

EFFECT: the invention ensures preparation of the composition from the dry-mixture tempered by water, which after solidification has the heightened strength for bending and compression and may be applied at the repair works for removal of the defects on the concrete surfaces.

6 ex, 6 cl