SU779329A1 - Concrete mix - Google Patents

Description

(54) CONCRETE MIXTURE

one

The invention relates to building materials, namely the composition of a concrete mixture, si, which can be used: for the manufacture of concrete and reinforced concrete products and structures.

Concrete mixtures are known, including Portland cement, mineral aggregate, water, and a plasticizing agent, such as lignosulfonates, sodium abietate 1.

The disadvantage of these concrete mixes is their low plasticity, which allows reducing the water-cement ratio in concrete mixes by an average of 10%.

The closest to the invention in its technical essence and the achieved result is concrete mix 2, comprising the following components, max 6%:

9-20,

Portland cement

Mineral filling71-84 tel

Sodium salt of sulfo-amber diesters

0 .02-0.4

Acid Else

Water

This concrete mixture also has a low ductility (ISO200%) as compared to the concrete mixture without an additive. In addition, the plasticizing effect of the additive after a short time of 5 (40-60 minutes) weakens, which is undesirable in the production of factory-made concrete,

The purpose of the invention is to increase 10 the plasticity of the concrete mix and increase the time for the preservation of the layer of fying effect,

This goal is achieved by the fact that a concrete mixture comprising portland cement, mineral aggregate, plasticizing agent and water contains as a plasticizing agent triethylbenzylamine salt of a mixture of di (heptylnonyl) sulphate acid esters of the general formula

 (O SCHCOOR sngsoon /

where R S., H, 5- SdN, 9. the following ratio of components f wt.%:

Portland cement 9-20 Mineral filler 71-84

Plasticizing agent 0.02-0.4

WaterEverything

The increased plasticity of the concrete mixture offered and the time for the preservation of the plasticizing effect are explained by the significant activity of the additive as a surfactant, which reduces the surface tension at the border: water is water from 72 to 1720 dyne / cm, while The sodium salt of sulfonic succinic acid diesters reduces the surface tension to 24 dyn / cm. The concrete mixture is prepared according to the generally accepted technology. The plasticizing additive is introduced with mixing water.

Portland cement brand 400

Mineral aggregate

Plasticizing

additive:

triethylbenam clammonium saltG mixture

di (heptylnonyl)

sulfo-ntar esters

acids,

sodium salt of diesters sulfo-succinic acid

Water

Concrete mobility

Plasticity of the mortar part of the concrete mix of 1: 3 (cement sand), mm

Compressive strength, kgf / cm

Time saving plasticizing effect, mission

Approximate compositions of the concrete mix are given in table. one.

In tab. 2 brought the properties of the approximate composition of the concrete mix.

 As follows from Table 2, the plasticity of the proposed concrete mix in comparison with the concrete mix without an additive increases by 224%, and in comparison with the known composition - by 0-24%. .

The preservation time of the plasticizing effect lengthens from 40-60 minutes to 85-120 minutes. The consumption of portland cement at an equal yield in the proposed concrete mix is reduced by 18–20% compared to the concrete mix without an additive,

Table 1

20

13

13

13

80

71

80

80

0.02 0.2 0.4 0, 2 6, 98 6.8 8.6 6.8 7.0

Table

20-21 20-21

235 235 110

105 112

210 305 108

60-90 85-120 85-120 30-50

Claims (2)

1.Pashchenko A.A., Serbia V.P., Starievsk E.A., In Reinventing Materials Kiev, Vishcha school, 1975, p .254, 2. USSR author's certificate I 477960, class C 04 B 13/24, 25.07.75,