RU2377204C1 - Method of preparing break stone and gravel (versions) - Google Patents

Abstract

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

Description

The invention relates to the preparation of large aggregates - crushed stone and gravel for subsequent use in high-quality concrete compositions.

A known method of preparing crushed stone and gravel, providing for its washing (water), followed by drying [1]. The aggregate prepared in this way is free of dusty, silty and clay particles, but may contain traces of harmful organic impurities that impede the normal hardening of concrete.

The objective of the invention is to improve the cleaning of aggregate from harmful organic impurities that impede the normal hardening of concrete.

The technical result is achieved by the fact that by the method of preparing crushed stone and gravel, which includes washing it with subsequent drying, washing is carried out with a solution of the following composition, wt.%: Hydrogen peroxide 20-30; potassium dichromate 1-2; sulfuric acid 1-2; water is the rest.

The result is also achieved by the fact that by the method of preparing crushed stone and gravel, which includes washing it with subsequent drying, after washing with water, gravel and gravel are kept for 0.5-24 hours in a solution of the following composition, wt.%: Hydrogen peroxide 20-30 ; potassium dichromate 1-2; sulfuric acid 1-2; water is the rest.

The method is illustrated by the following examples.

1. Sulfuric acid, potassium dichromate are added to water with a temperature of 20-25 ° C and mixed. Hydrogen peroxide is poured into the resulting mixture and mixed again. The ratio of components for the preparation of the solution is shown in the table.

Components Content, wt.% In the compositions one 2 3 Hydrogen peroxide twenty 25 thirty Potassium dichromate 2 1,5 one Sulphuric acid 2 1,5 one Water rest rest rest

Crushed stone and gravel, optionally pre-fractionated, are washed with the prepared solution and dried to constant weight.

2. Crushed stone and gravel are washed with water, placed in a container with a solution (table), where they are kept for 0.5-24 hours. Then, crushed stone and gravel are removed from the solution and dried to constant weight.

Prepared by the proposed method, the aggregate is cleaned not only from dusty, silty and clay particles, but also harmful organic impurities, fats, vegetable oils, sugars, as well as microorganisms and their metabolic products.

The source of information

1. Popov L.N. Laboratory tests of building materials and products. - M. - Higher. school., 1984. - S.68-69.

Claims (2)

1. The method of preparation of crushed stone and gravel, providing for its washing with subsequent drying, characterized in that the washing is carried out with a solution of the following composition, wt.%:
hydrogen peroxide 20-30 potassium dichromate 1-2 sulphuric acid 1-2 water rest 2. A method of preparing crushed stone and gravel, comprising washing it with subsequent drying, characterized in that after washing with water, gravel and gravel are kept for 0.5-24 hours in a solution of the following composition, wt.%:
hydrogen peroxide 20-30 potassium dichromate 1-2 sulphuric acid 1-2 water rest