SU833721A1 - Concrete mix - Google Patents

Description

(54) CONCRETE MIXTURE

I

The invention relates to building materials, in particular to compositions of concrete mixtures containing water-conducting organic and inorganic additives.

A known concrete mixture comprising Portland cement, aggregate, water, and an additive — aluminum sulphate and polyacrylamide 1.

Closest to the proposed technical essence and the achieved result is a concrete mix 2, which includes cement, sand, crushed stone, polycarboxylic acid hydrazide and water with the following ratio of components, wt.%: Cement17-22

Sand23-28

Crushed stone 48-53

Polymer carboxylic acid hydrazide 0.06-0.36

WaterEverything

The disadvantage of these mixtures is low adhesion to steel reinforcement and low water resistance.

The purpose of the invention is to improve the adhesion to steel reinforcement and the water resistance of the resulting concrete.

The goal is achieved by the fact that the concrete mixture, including cement, sand, crushed stone, polycarboxylic acid hydrazide and water, additionally contains a salt of the divalent metal at the following sorts of components, wt.%: Cement17-22

Sand23-28

Crushed stone 48-53

Polycarboxylic acid hydrazide, 0.06-0.36

Salt of the divalent metal 0,07-0,87

WaterEverything

It is envisaged to introduce the following salts: Ca, SC, BaCli, SrCli, CdSO, ZnSO, NiSO /, and CoSQ.

five

: The positive effect of the salt of the divalent metal is due to its interaction with the polycarboxylic acid hydrazide with the formation of metal polyhydrazinates of the complex structure R

, -C

HiN-HN-C 0

v

Me (A) g-2.

where R H, -CHj, Me is a bivalent metal; Nd, OH-etc., and also due to the activation of the metal surface due to the interaction with the salt introduced into the mixing water, and the formation of bonds between the hydrazide and the metal surface and the salt with the cement stone. The fact of the formation of polycomplexes in the concrete mixture was proved by planting hydrates of metal oxides from salts introduced into the concrete mixture and by analyzing the reflection spectra of precipitates on an SF-2M spectrophotometer. The spectra confirm the almost quantitative binding of divalent metal salts in the concrete mixture environment.

The concrete mix is prepared as follows .X

In the mixer mix the cement, rubble and sand for 2.5 minutes. Polycarboxylic acid hydrazide is pre-dissolved in 3/4 parts of the mixing water, after cooling it is introduced into the concrete mixture and stirred for 1.5 minutes, and then introduced

1717172О2О

2323232525

5353535О5О O.Ob0, О60,060,200,20 Cement Crushed stone Hyprazip polahO, 250.36 (zhpoic acid Salt of ovuhvalentio 0, 320.87 th metal 7.434.77

salt solution in the remaining mixing water and mix with es.e for 1 min. The prepared concrete mix is placed in molds, compacted on a laboratory vibratory plate with a vibration amplitude of 0.5 mm and a frequency of 3000 vibrations per minute, and after preliminary exposure for 2 hours, steamed in the following mode: temperature rise from 20 to 90 ° C for 3 h, isothermal heating at 90 ° C for 6 h, cooling for 4 h. Then, the samples are decompressed and stored under normal conditions.

Concrete mixes are prepared with various salts with polymethacrylic acid hydrazide (Table 1) and polyacrylic acid hydrazide (Table 2).

After testing the proposed formulations obtained the results presented in table. 3

The concrete mixture of the proposed composition has an increased adhesion to steel reinforcement and a higher water resistance compared to the known.

Table 1

20 25 50

0.20

Table 2 O, O 0, O8 3.86 o, 06 0.08 5.86

juice, crushed stone, polycarboxylic acid hydrazide and water, characterized in that, in order to increase adhesion to steel reinforcement and water resistance, it additionally contains a salt of a divalent metal in the following ratio of components, weight. %:

Cement 17-22

Sand23-28

Table

Bivalent salt

metal0.07-0.87

WaterEverything

Sources of information taken into account in the examination

1. USSR author's certificate number 389051, cl. From 04 To 13/24, 1971.

2. USSR author's certificate number 607812, cl. From 04 To 13/24, 1976.

Claims (1)

Claim Concrete mixture including cement, sand, gravel, polymer carboxylic acid hydrazide and water, characterized in that, in order to increase adhesion to steel reinforcement and water resistance, it additionally contains a divalent metal salt in the following ratio of components, weight. %: Cement 17-22 Sand 23-28 Crushed stone 48-53 Polymer Carboxylic Acid Hydrazide 0.06-0.36 40 Divalent salt metal 0.07-0.87 Water Rest