RU1772094C - Method of concrete mixture production - Google Patents

Abstract

Usage: production of concrete and reinforced concrete products and structures. SUMMARY OF THE INVENTION: a method for preparing a concrete mixture comprises mixing Portland cement, aggregate and water in an amount of 60-70% of its total amount, then after 8-90 minutes the rest of the water is added with an additive including: oxidized waste from the production of resorcinol with caustic soda in the ratio 1: 0.4 70-80% and the phytosterol processing product based on fatty and resin acids 20-30%, in the amount of 0.05-0.3% by weight of cement. Duration of concrete mix is 221 min, concrete compressive strength at 14 days 42.1 MPa, 28 days at 47.3 MPa, with a 10% reduction in cement consumption, concrete strength 39.2 MPa at 14 days, at the age of 28 days - 43.7. MPa. 1 tab.

Description

(L

WITH

The invention relates to the field of building materials, in particular, to methods for preparing concrete mixtures used in the production of concrete and reinforced concrete products and structures,

A known method of preparing a concrete mixture by introducing into it a plasticizing additive - a product of the polycondensation of phenol, formaldehyde, diethanolamine and silicon oxygen in the amount of 0.05-1.0% by weight of cement.

The closest in technical essence and the achieved result to the invention is a concrete mixture, including, wt.%: Cement 10-22, sand 18-25, crushed stone 52-60, caustic soda 0.0020, 01, oxidized waste production of resorcinol 0.005- 0.025 and water - the rest. However, the mixture has a relatively short setting time and relatively low strength.

The purpose of the invention is to increase the setting time of the concrete mixture, increase the strength of concrete in the early stages of hardening, and also reduce the consumption of cement.

This is achieved by the fact that the method of preparing the concrete mixture by mixing Portland cement, aggregate, additives — oxidized waste from the production of resorcinol and an aqueous solution of caustic soda with a mass ratio of 1: 0.4 in dry products in the amount of 0.05-0.3% by weight of cement and water, mix Portland cement,

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W Y O O Ј

filler and water in an amount of 60-70% of its total amount, then after 8-90 min the remaining part of water with the indicated additive and the phytosterol processing product based on fatty and resin acids are introduced at a mass ratio to the oxidized waste of resorcinol production with caustic soda (20-30): (70-80).

As starting materials use: the product of the processing of phytosterol (TU 13-40001-77-109-86) obtained from crude sulfate soap when phytosterol is isolated from it and containing, wt.%: Fatty, tar acids and unsaponifiable less than 80; alcohol no more than 4; the water content in the product is more than 70%; Portland cement M-400; crushed stone fractions of 5-20 mm and sand with MKP 2.59.

The conditions for the preparation of concrete mixtures according to the known and proposed solutions, as well as the physicomechanical characteristics of concrete mixtures and samples are presented in the table.

Claims (1)

The claims A method of preparing a concrete mixture by mixing Portland cement, aggregate, additive of oxidized waste from the production of resorcinol and an aqueous solution of caustic soda in a mass ratio of 1: 0.4 in the amount of dry products in the amount of 0.05-0.3% by weight of cement and water, distinguishing and so that in order to increase the setting time of the concrete mixture, increase the strength of concrete in the early stages of hardening, as well as reduce the consumption of cement, Portland cement, aggregate and water are mixed in an amount of 60-70% of its total amount, then after 8-90 minutes enter remaining loc part of the water with said additive product, and further processing on the basis of phytosterol fatty and rosin acids in a weight ratio to the oxidation of the waste production of resorcinol with sodium hydroxide (20-30): (70-80).