SU1747426A1 - Raw materials mixture for foamed concrete preparation and method of its preparing - Google Patents

Abstract

The invention relates to the building materials industry and can be used both in prefabricated houses and in monolithic construction to produce lightweight concrete mixtures. The mixture contains, wt%: Portland cement 30-40; lightweight porous aggregate fraction 10-20 mm 24-30 and fraction-5-10 mm 16-24; lime 0.11-0.70; superplasticizer 0.20-0.30; wood saponified resin 0.11-0.70, water the rest. In the method of producing a lightweight foam concrete mixture, during the preparation, the lightweight aggregate is first mixed with 20-40% by weight of water for 60-90 seconds, then cement and 45-65% by weight of water are added, stirred for 60-90 seconds, after which The previously prepared mixture of wood saponified resin with lime is put in, and after 30-40 with stirring the remaining part of water is added with plasticizer dissolved in it with stirring for 60- 90 seconds. The strength of foam concrete is 10.1-11.6 MPa, frost resistance 67-73 cycles , density 820-930 kg / m, coefficient of thermal conductivity -02 2-0.24, W / m-K 2 from p. F-ly. 3 tab.

Description

The invention relates to the building materials industry and can be used both in prefabricated houses and in monolithic construction to produce lightweight concrete mixtures.

Known lightweight clay mixture, including,%

Portland cement21 0-23.0

Clay sand

fr less than 0,141.0-1.9

fr 0.14-0.35 mm6.0-6.9

fr 0.35-0.63 mm fr. 0,63-1,0 mm expanded clay gravel

Air entraining additive

Shredded wood or guza pa fr. 10-20 mm Clay Water

8.0-8.9 5.0-5.8

27.0-30 About 0.4-0.5

7.2-9.68 0.8-1.32 Else

Xi

four

yoo o

However, the wood used in this solution is not a durable bi-resistant material. When moisture changes, it will swell and shrink, causing destructive changes in the concrete. The anisotropic properties of the wood structure can greatly affect the strength characteristics of concrete, its durability.

The closest in technical essence and the achieved result to the invention is the raw mix for the production of lightweight concrete, containing, wt.%:

Portland cement19-22

Expanded clay gravel 36-42 Perlitovy sand2,1-2,7

Sulphite yeast brew0.03-0.07

Ethoxylated alkylphenol with a degree of oxyethylation of 7, 0.06-0.09

Triethanolamine 0.17-0.28

Zolz-ash of thermal power plants 12,0-22,0

Lime1,2-1,5

WaterEverything

The prior art method of obtaining a light-mix, selected as a prototype, contains the sequential introduction of ceramsite gravel, Portland cement, fly ash, lime, perlite sand and water with organic additives previously dissolved in it with continuous mixing, molding and heat treatment.

A disadvantage of the known raw material mixture and production method is the impossibility of its use in monolithic construction, since The composition and sequential mixing of all components with the introduction of water at the end does not allow to obtain a cast mixture that does not separate when fed by pneumatic conveying. In addition, the obtained products are not characterized by high frost resistance and relatively low surface quality.

The aim of the invention is to obtain cast mixtures, increase frost resistance, improve the quality of the front surface, as well as ensure the possibility of feeding the mixture by pneumatic transport.

The goal is achieved by the fact that a lightweight foam concrete mixture, including Portland cement, lightweight aggregate, lime, frother, plasticizer and water, contains lightweight porous fraction less than 10 mm and 10-20 mm fraction as a lightweight aggregate, saponified wood resin as a frother, and as a plasticizer superplasticizer in the following ratio of components, May%

Portland Cement 0-40.0

Easy porous aggregate fraction less than 10 mm16,0-24,0

fractions 10-20 mm24.0-30.0

0 Lime 0.70-1.10

Wood resin

omylenk-e 0,70-1,10

Superplasticizer 0.20-0.30 WaterElite

5 The goal is also achieved by the fact that in the method of obtaining a raw mix for the production of foam concrete, including the preparation of a mixture by sequential introduction of light filler, portland cement, lime, frother and water with plasticizer dissolved in it with constant mixing, molding and curing, with / In preparing the mixture, at first a light filler is mixed with 20-40% by weight of water for 60-90 seconds, then cement and 45-65% by weight of water are added with stirring for 60-90 seconds, after which the pre-mix is added no-mix

0 wood saponified resin with lime, and after 30-40 seconds, the remaining part of the water with the plasticizer dissolved in it is introduced with stirring for 60-90 seconds.

The invention is implemented as follows.

A forced aggregate with 20-40% by weight of water is introduced into the forced-mixer with constant agitation. After saturating it with water (after 60-90 s)

0 cement is supplied to the concrete mixer with 45-65% by weight of water, stirred for 1.0-1.5 minutes (60-90 s) and a previously prepared mixture of wood saponified resin and lime is added. In 30-40 seconds

After stirring, the remaining water with the superplasticizer dissolved in it is introduced into the mixture, continuing the stirring for 60-90 seconds. The mixture is fed to the molding. Curing of the molded products is carried out in a manner accepted during production.

According to the described technology, samples were made, the sotavstav of which are given in table 1. Blend Options

5 are listed in table 2. Physico-mechanical characteristics obtained in the result of the tests are presented in table 3

In examples 1-8, the raw meal was prepared with the technological parameters specified in example 10 (see Table 2).

examples 9-11 (see table 2) was used the composition of example 3 (table 1).

The use of the invention will make it possible, with a significant improvement in the physicomechanical and thermal characteristics, to expand the scope of application of the lightweight foam concrete mix.

Claims (2)

1. Raw mix for the preparation of foam concrete, including Portland cement, lightweight porous aggregate, lime, foaming agent, plasticizer and water, characterized in that, in order to obtain cast mixtures, improve frost resistance, improve the quality of the front surface, as well as provide the possibility of feeding by pneumatic transport, it contains a lightweight porous aggregate of fraction 10 and a fraction of 10-20 mm, saponified wood resin as a frother, saponified wood resin as a plasticizer - superplasticizer in the following ratio of nanov, wt.%: Portland Cement 30.00-40.00 Lightweight porous aggregate fraction 10-20 mm24,00-30,00 Lightweight porous aggregate of $ 10 mm fraction 16.00-24.00 Lime 0.70-1.10 Wood resin 0.70-1.10 Superplasticizer 0.20-0.30 WaterElite 2. A method for preparing a lightweight foam concrete mix, which includes the sequential introduction of a light porous aggregate, Portland cement, lime, a frother and water with a plasticizer dissolved in it with constant mixing, which in order to obtain cast mixtures, improve frost resistance, improving the quality of the front surface, as well as ensuring that pneumatic conveying is possible, first, light porous aggregate is mixed with 20–40 wt.% of water for 60–90 s, then portland is added at 45–65 May,% of water, is stirred for 60–90 s, after which the previously prepared mixture of wood saponified resin with lime is added, and after 30–40 s, the remaining part of the water with the plasticizer dissolved in it is added. mixing in For 60-90 C. Table Expanded clay (GOST 9759-83) fr, 0-10 mm fr 10-20 mm Ar op (GOST 9757-83) fr 0-10 mm fr 20-20 mm Shungizit (GOST) fr 0-10 mm fr 10-20 mm Shlakov Pumice (GOST 9757-83) fr 0-10 mm fr. 10-20 mm Expanded perlite (GOST 9757-83) fr O-1 0 mm fr. 10-20 mm Lime (GOST 9179-77) Wood saponified resin (TU 13-05-02-63) Superplasticizer C-3 (TU 6-1lt-625-30) LTM (TU5. Water 19 27 sixteen 21 19 27 19 27 22 28 19 27 1.10.9 9.9C, 90.9 1.10.9 0.90.90.9 0.30 0.250.25 0.3-0.3 17.5 16.95 16.915.9516.9 19 27 0.9 0.9 0.3 16.9 Table 2