SU1284965A1 - Method of preparing concrete mix - Google Patents

Abstract

This invention relates to a technology for preparing a concrete mix and is aimed at slowing down the loss of its mobility. The method of preparing a concrete mix consists of mixing cement, aggregate, mixing water and 0.1-0.5% of the additive by weight of cement previously prepared by mixing casein glue, lime and water at a ratio of 1: 0.1: 1, and then heat treatment in an autoclave at a pressure of 1.8-2.2 atm for 2-3 hours. Table 4.

Description

The invention relates to the field of building materials and can be used in road construction for the preparation of a concrete mixture based on alinite cement.

The purpose of the invention is to slow down the loss of mobility of the concrete mix.

Physico-mechanical properties of concrete samples prepared by the known and proposed methods are given in table 1.

For the preparation of the concrete mixture, M-DOO alinite cement, medium silica sand M 2.45, and crushed granite fraction 5-20 mm are used. A concrete mix of the following composition is prepared.

Alinite cement 264 Sand741

Rubble1151

Water155

Additive in the concrete mixture is introduced in an amount of 0.1-0.5% by weight of cement.

The rationale for the selected ratio of components and parameters of the proposed method is given in table 2-4

From tab. 2 that the increase in pressure above 2.2 atm is impractical because it does not give an increase in the value of the retardation coefficient -.

From tab. 3 shows that the optimal. is calcium oxide content

0.1 May.4.

From tab. 1, it can be seen that the pot life (mobility preservation period) of the concrete mixture prepared by the proposed method increases 1.5-2.0 times compared to the known method, while the additive is being heat treated for 2-3 hours, and the strength of the concrete obtained is increased by 15- 20%, since in the concrete mixture prepared by the proposed method, an increase in viability is achieved while reducing the water demand of the mixture due to the plasticizing effect of the additive. The optimum amount of the additive reduces the water demand of concrete mixes by 10–15% while maintaining the desired mobility of the mix, which allows either to increase the strength of the concrete produced, or, at normalized strength, reduce the consumption of cement by 14–16%.

Claims (1)

Invention Formula A method of preparing a concrete mix, which consists of mixing cement, aggregate, mixing water and 0.1-0.5% of the additive by weight of cement previously prepared by mixing animal glue, lime and water, characterized by that. The viscosity of the concrete mix, animal - casein glue, lime and water are mixed in a ratio of 1: 0.1: 1 and heat treated in an autoclave at a pressure of 1.8-2.2 atm for 2-3 hours. Table 1 Continuation of table 1 0.6 0.8 1.0 1.2 1.4 1.6 1.2 1.2 1.3 1.5 1.5 1.5 1.5 1.5