SU893939A1 - Concrete mix - Google Patents

Description

(54) CONCRETE MIXTURE

I

The invention relates to the building materials industry, namely to the compositions of concrete and mortar mixtures and can be. It is used in the manufacture of concrete and reinforced concrete products and structures.

A known concrete mixture containing cement, aggregate, water and an additive. The additive is a product of phenol and formaldehyde polycondensation and is introduced into the concrete mixture in an amount of 0.01-0.1% by weight of cement 11.

Not too close to the proposed technical essence and the achieved result is a concrete mix, including cement, aggregate, water and an additive. As an additive, melamine urea-formaldehyde resin is used in the amount of 1-2% by weight of cement {2.

A disadvantage of known concrete mixtures is their relatively low mobility and strength of concrete products.

The purpose of the invention is to increase the workability of the concrete mix and the strength of the concrete.

This goal is achieved by the fact that a concrete mixture, including cement, aggregate, water, and an additive based on melamine urea formaldehyde ylols, contains as an additive a product of combined polycondensation of melamine and urea with formaldehyde in the presence of oxalic acid, modified with ligand sulfate and sodium sulfite in the following ratio of components, mash .%:

to

Cement 16,66-22,972

Filler67,58-76,84

Additive0.08-0.38

WaterEverything

ts

The additive is a resinous mass, readily soluble in water, of the following composition, wt.%:

Melamine

13.4-13.7

Formalin 47.2-48.2

20

Sodium Sulfite 22.0-22.1 0.4-0.6

Oxalic acid 8.0-8.2

Urea 8.0-8.2 Ligninsulfonate Concrete mixture is prepared as follows. The additive is introduced into the concrete mix with the mixing water. The mass is mixed and formed into articles. Example I. The effect of the additive on the physicomechanical properties of granular concrete was investigated. The compositions of the studied concrete mixtures and the properties of concrete are given in table. 1. 9.4 Example 2. The effect of the additive on the physical and mechanical properties of heavy concrete was studied. The compositions of the studied concrete mixtures n properties of concrete are given in table. 2. As follows from the test results, the proposed concrete mix, as compared to the known ones, has an increased workability and contributes to an increase in the strength of concrete, which makes it possible to reduce cement consumption by 15–20%. Table 1

With a view that, in order to improve the workability of the mixture and the strength of concrete, the eye contains as an additive a product of polycondensation combined with melamine and urea with formaldehyde in the presence of oxalic acid, modified with ligninsulfonate and sodium sulfite in the following ratio of components, wt.%.

Sources of information taken into account in the examination

) S

1. USSR author's certificate number 481566, cl. From 04 To 13/24, 09/08/72.

2. Authors certificate of the USSR N 438625, cl. From 04 To 13/24, 09/08/72.

Claims (1)

Claim A concrete mixture including cement, aggregate, water and an additive based on melamine urea formaldehyde resin, characterized in that, in order to increase the workability of the mixture and the strength of concrete, it contains, as an additive, the product of joint polycondensation of melamine and urea with formaldehyde in the presence of oxalic acid, modified with lignin sulfonate and sodium sulfite in the following ratio of components, wt.%. 16.66-22.972 67.58-76.84 0.08-0.38 Else Cement Aggregate J0 Additive Water