SU814929A1 - Complex additive to concrete mix - Google Patents

Description

one

The invention relates to building materials, namely, compositions of complex additives for concrete and can be used in the manufacture of concrete products and structures.

Complex additives for concrete are known that contain, for example, sulfite alcohol bard, sodium nitrite / nitrate I.

The disadvantage of the additive is its insufficient protective effect on steel reinforcement of reinforced concrete.

Closest to the proposed technical essence and the achieved result is a complex additive 2, which includes the following components, wt.%:

Sodium sulfate 19.3-64.5

Sodium nitrite 19.3-64.5 Sulphite dross fermented mash 6.5-26.0

The anti-corrosion effects of this complex additive are determined by its sodium nitrite content.

The disadvantage of the additive is that in order to achieve a high protective effect it is necessary to use the normal content of sodium nitrite (it is ineffective in small quantities).

The purpose of the invention is to reduce the corrosion of steel reinforcement and reduce the consumption of sodium nitrite.

This goal is achieved by the fact that the complex additive for concrete mix, including sodium sulfate, sodium nitrite and sulphite yeast mash, additionally contains saponified concentrate of isomeric monocarboxylic acids in the following ratio of components, wt.%:

40,8-68,8

Sodium Sulphate 8.3-16.6

Sodium nitrite

Sulfide Drozha

6.3-26.0

mash

Washed concentrate

isomeric monocarboxylic acids

8.3-24.9

fractions 9g5

The washed concentrate of isomeric it carbonic acids of С -25 fraction has the following composition. wt.%:

Sodium salt

isomeric monocarboxylic acids

25-65

fractions C, 2 -Cjg

Sodium salt

Dicarbonic

Acid fraction 2-12, io Sodium salts of normal monocarboxylic acids fraction C, 2 -GIS 25-65 Calcined and caustic soda, 0.1-1.5, Nonsilables Remaining Complex additive is obtained by mixing the components or dissolving them in water at 50-60-C. The content of concrete in the concrete mix is 0.6-1.9% by weight of cement. Example 1. Complex additive, desulfate, wt.%: Sodium sulfate 66.0, sodium nitrite 8.0, sulphite yeast brew 26.0, in an amount of 10.0 g are placed in a measuring flask and dissolved in a preheated 50 tap water with 1 hardness of 14.2 mEq / l, the amount of solution in the flask is up to 1000 ml. A solution with a concentration of the complex additive of 10.0 g / l is obtained. Steel plates of Art. 3 are placed in the prepared aqueous solution and kept at 22 ° -3 ° C for 700 hours. From the difference in weights of steel plates before and after testing, the corrosion rate is determined by the standard method. The protective effect of the complex additive is determined by the formula P- where r is the corrosion rate without the complex additive, J) is the same with the complex additive,. As a control, tap water is used (hardness is 14.2 mEq / l), in which the corrosion rate of St3 is 0.066 g / m. The results of the corrosion tests are shown in the table. At the same time, a complex additive is tested to determine the strength of the compression of a concrete mixture of a brand of 200 blowing composition ,, kg: Slag Portland Cement M-400 3.5 Sand with Mkr 0.91-1.3 5.8 Crushed stone fraction 5-20 mm 12.7 Water 1.98 The test results are presented ablitse. Example 2. Carried out according to measure 1, except for the composition of the plex supplement. The complex additive has the following composition, wt.%: Sodium sulfate. 68.8 Sodium nitrite 16.6 Sulfite douglas 6,3 saponified isomeric monocarboxylic acid concentrate8,3 The test results are shown in the table. Example 3. Carried out according to measure 1, with the exception of the composition of the avka. The composition of the complex additive, wt.%: Sodium sulfate 40.8 Sodium nitrite 8.3 Sulfite yeast brewing 26.0 Saponified concentrate of isomeric monocarboxylic acids 24.9 The test results are presented in the table. PRI me R 4. It is carried out according to measure 1, except for the composition of the cake: Composition of the complex additive, wt.%: Sodium sulfate 59.1 Sulfite yeast brew 16.0 Omalented concentrate of isomeric monocarb. Acids 24.9 Test results are given .

Corrosion rate, g / m Protective effect,%

Compressive strength, MPa

As follows from the table, the introduction of a complex additive improves 40 the inhibitory ability of the concrete mix, while the strength indicators practically do not change.

In addition, the sodium nitrite wastes from 19.3-64.5 to 8.3-16.6%. 65

0.0440 0.00570 0.0019 0.0106 32.7 91.3 97.2 83.8

20.3

20.0 19.2

19.6

Claims (2)

1. A complex additive for concrete mix, including sodium sulfate, sodium nitrite and sulphite yeast mash, characterized in that, in order to reduce corrosion of steel reinforcement and reduce sodium nitrite consumption, the additive additionally contains a concentrate of isomeric monocarboxylic acid Cf, 2 - Cgg at the following sdnoshenii components, wt.%: Sodium Sulfate 2. Additive according to claim. 1, characterized by the fact that the saponified concentrate of isomeric monocarboxylic acids of fraction C "h has the following composition, wt.%: Sodium salts of isomeric monocarboic acids fraction (25 25-65 Sodium salts of dicarboxylic acids of fraction С s.o 2-12 Sodium salts of normal monocarboxylic acids fractions C, 2 25-65 Calcined and caustic soda 0.1-1.5 Uncleaned substances. Rest Sources of information taken into account in the examination 1. USSR author's certificate  415245, cl. C 04 B 13/20, 23.05,72. 2. Chekhov A.P., Sergeev A.M. Handbook of concrete and mortar. Kiev, Budivelnik, 1972, p. 41