METHOD OF PREPARING BREAK STONE AND GRAVEL (VERSIONS) Russian patent published in 2009 - IPC C04B20/02 

FIELD: building.

SUBSTANCE: invention refers to preparing large-size fillers - break stone and gravel for successive usage in compositions of high-quality concrete. According to the method of preparing break stone and gravel providing their washing with following drying, washing is carried out with solution of the following composition, wt %: hydrogen peroxide 20-30, potassium dichromate 1-2, sulphuric acid 1-2, and water - the rest. According to the method of break stone and gravel preparing providing their washing with successive drying, upon washing with water there is performed conditioning of break stone and gravel during 0.5-24 h in solution of the following composition, wt %: hydrogen peroxide 20-30, potassium dichromate 1-2, sulphuric acid 1-2, and water - the rest.

EFFECT: improved purification of filler from impurities preventing normal hardening of concrete.

2 cl, 2 ex, 1 tbl