SU833714A1 - Complex additive to concrete mix and cement-based building mortar - Google Patents

Description

(54) COMPLEX ADDITIVE FOR CONCRETE MIXTURE AND BUILDING SOLUTION BASED ON CEMENT

I

This invention relates to compositions of complex additives for a concrete mix and mortar on heavy or light aggregates.

A known complex additive for concrete mix, including sodium sulfate and sulfite-alcohol bard. The additive increases the strength of concrete by steaming 1.

Closest to the proposed technical essence and the achieved result is a complex additive 2 for cement concrete mix, which includes the following components, wt.%: Sulfite-alcohol bard OJ-0.2

Abietat sodium 0.01-0.1

Sodium alginate 0.05-1.0

The disadvantages of the mixture with such an additive are low plasticization, low air entraining, loss of initial air entraining and mobility during storage without the possibility of re-recovery when moving, as well as the scarcity and high cost of components.

The purpose of the invention is to increase the plasticization and air entrapment with the possibility of restoring the original air entrapment when moved. This goal is achieved by the fact that - a complex additive for concrete mix and cement-based mortar, including lignosulfonate and air-entraining component, additionally contains sodium or potassium salts, forming poorly soluble compounds with calcium ion 0, and refined alkylarylsulfonate as follows, the ratio of components, wt. ° / o:

Lignosulfonate1,5-30

Refined alkylaryl sulfonate 3-60

Sodium or potassium salts forming poorly soluble compounds with calcium ion 10-90

The proposed complex additive is obtained by simply displacing all the components under normal conditions. The component, a refined alkylaryl sulfonate, is introduced into the concrete mix in concentration based on the product, the remaining components in concentration calculated on dry matter. Refined alkylaryl sulfonate (RAS) based on sulfonic acids of kerosene fractions, which are sodium salts of petroleum sulfonic acids (sodium alkylarylsulfonates), has the following characteristics: at 20 ° С a homogeneous transparent liquid completely dissolved in water containing surfactants (sulfonic acid salts ) not less. not sulphurous substances no more than 1 ° / o. From the proposed composition, compositions have been prepared which are introduced together with the mixing water into the mortars made on Portland cement and quartz sand with different grain size units. The soluble mixture is made by simply displacing all the components under the usual conditions for 5 minutes. For comparison, the composition of the cement-sand mixture with a known additive was made. For each composition, the amount of air entrained, the depth of the Tetmaier's pestle, and the spread of the cement-sand cake on the shaking table are determined. Solutions with the proposed additive have a higher air entrapment, mobility and the ability to restore the initial amount of entrained air when re-displaced after prolonged exposure. The joint introduction of the three components of the additive, in addition to the properties indicated above, provides an increased synergistic effect with respect to air entrapment and plasticization. A synergistic effect is provided by introducing into the proposed additive any

4.8 15.979.3 -

3.5-87.7

8,8

13.95-58.15

27.9

12.5-62.5

25, O 4, 8 15.979.3

12,1-66,7

21.2

12.5-62.5

2S, 0

Table 1

3.36 0.54 1.4 21.4

149

3.36 0.51.4 25.0 160

3.36 0.54 1.4 25.0 202 potassium or sodium salts forming poorly soluble compounds with calcium ion, with the same effect, a mixture of these salts can be used in any proportion, since the action of sodium and potassium salts is equivalent. Salts that form poorly soluble compounds with calcium ion, are also accelerators of the hardening of concrete and mortar, providing a sufficiently high strength with a significant amount of entrained air. The ability to control the amount of entrained air by increasing the time required to move the mixture containing the proposed additive can be used to reduce the bulk density and reduce the thickness of the structure in the manufacture of concrete and reinforced concrete products under factory conditions. The ability of this mixture to restore the amount of entrained air and mobility after re-mixing can be used in the production of monolithic reinforced concrete in summer and winter under polygon conditions, and allows long-term transportation and storage. Studies show that concretes with a new complex air-entraining and plasticizing additive have a higher frost resistance compared to concrete with known additives. The compositions and properties of samples made from concrete mix with the proposed additive are presented in table. 1. The results of the effect of the holding and re-moving time of the mortar mixture with the proposed additives on the amount of air entrained are given in Table. 2. Note: 2

3. Sample prototype converted to wt.%. 140

21.4 18.2 17.6 17.2 19.9 25.0 17.7 15.1 14.1 13.7

160

19O 30.8 26.9 25.2 23.0 21.3

8 (Pro Mass 14, O 12.0 11.8 11.5 11.2 t1ip) does not spread;

Proopozhenie tab. one

table 2

13716,8

18034, O

21O41.0

Weight is not 11.0

spreads The following substances were used as ligosulphonate: in the compositions 1-4 PRS (suprise-alcohol bard) based on calcium lignosulfonates; in compositions 5-7 SLB (sulfite yeast barges) based on sodium lignosulfonates} in compositions 8-12 and 17 and 18 SOB mixed on the basis of sodium and calcium lignosulfonates; in compositions 13-15, sulphite chips based on calcium and sodium lignosulphonates; in the composition of the 16th fraction of calcium lignosulphonates, allocated to the primary adsorption to the surface of the cement. As a salt, forming poorly soluble compounds with calcium ion, the following materials were used: in compositions 2, 6, 9 and 18, sodium sulfate, in compositions 3.7, 11 and 17, potassium sulfate; in compositions 4 e 12 a mixture of potassium and sodium sulphates (1: 1); consisting of 10 carbonate capi (potash); composed of 13 mixed sodium phosphate; 14: a mixture of disubstituted sodium phosphate and sodium sulfate (4: 1); composed of 15 oxapat sodium; 16 blend of caps sulfates in sodium (2: 3).

Claims (2)

1. Isaev V.S. and others. Complex chemical additives in cassette technology for the production of concrete and reinforced concrete products. - “Concrete and reinforced concrete, 1969, No. 4, p. 45-48. 2. USSR author's certificate number 201347, cl. From 04. On 13/20, 1967.