SU808325A1 - Concrete mix preparation method - Google Patents

Description

(54) METHOD FOR PREPARING A CONCRETE MIXTURE

one

The invention relates to the technology of building materials and can be used in the manufacture of concrete and reinforced concrete structures.

There is a known method of preparing a blend by pre-mixing cement with 25-75% of mixing water and a hydrophilic additive, introducing a filler and the rest of the water into the resulting mixture 1.

The disadvantage of this method is the relatively small degree of hydration of the cement and, therefore, the activity of the cement.

The closest to the proposed technical essence and the achieved result is a method of preparing a concrete mix, including mixing cement, aggregate with a solution of lactic acid

R2.

However, being a powerful cement accelerator, lactic acid reduces the mechanical strength of the cement stone.

The purpose of the invention is to increase the cement activity and strength of concrete.

The goal is achieved by In a method that includes mixing cement, a filler with an aqueous solution of lactic acid, cement 5 is closed with a 0.5-1.0% aqueous solution of lactic acid, after which the aggregate previously treated with sodium or calcium sulfites is introduced into the mixture.

 The aggregates are treated with sodium or calcium sulphites by irrigation with 10–20% salt solutions, and the sodium sulphite consumption per 1 m of concrete is 2.55 4.8 kg.

The sulphite-treated aggregate is dried at 40 ° C with hot air.

Example. Make samples

0

concrete two series.

A known concrete mix (I seril) is prepared by mixing cement and aggregates, into which 0.3-aq.

5 solution of lactic acid.

A concrete mix (series II) is then prepared by mixing the cement with a 0.5-1.0% aqueous solution of lactic acid. After stirring for 3-5 minutes, a mixture of aggregates treated with sodium or calcium sulphite is introduced into the cement paste.

The dog is used as a tracer for a series of samples. M 500 tandcement is used. Large aggregate is crushed stone, and fine quartz sand with a particle size module of 1.0–1.2 when the test results show that the concrete mix produced by the proposed method has more high strength properties, especially in the early stages of hardening of the concrete Formula of the invention The method of preparation of concrete cm s, including the mixing of cement, aggregate with an aqueous solution of lactic acid, is distinguished, in order to increase

composition of concrete, kg:

.Portlandtsement 255 Crushed granite 1100 Quartz sand 650, which also includes 170 liters of water.

The results of testing samples of concrete made by the proposed and known methods are presented in the table. Neither the cement activity nor the strength of the concrete, the cement is closed with a 0.5-1.0% aqueous solution of lactic acid, after which the aggregate previously treated with sodium or calcium sulphite is introduced into the mixture. Sources of information taken into account in the examination of 1 USSR Author's Certificate No. 605799, cl. From 04/15/00, 07/16/76. 2. Your S.M. and Rakhimbaev Sh.M. Fast setting cement mortar with organic additives. - Concrete reinforced concrete .1969, No. 7, p. 44-45.

Claims (1)

Claim A method of preparing a concrete mixture, including mixing cement, aggregate with an aqueous solution of lactic acid, characterized in that, in order to increase the activity of cement and the strength of concrete, the cement is shut with 0.5-1.0% aqueous solution lactic acid, after which an aggregate pretreated with sodium or calcium sulfites is introduced into the mixture.