SU1479443A1 - Composition for impregnatic cellular concrete - Google Patents

Abstract

This invention relates to a process for the production of heat insulating products from cellular concrete. The purpose of the invention is to reduce water absorption and the thermal conductivity coefficient in the wet state of cellular concrete. Composition for impregnation of cellular concrete contains (wt.%) Liquid glass 54.1-69.1

styrene-butadiene latex 25.0-35.0

calcium nitrate 0,1-0,2

sodium ethylsiliconate 5.0-7.0

fine ground cellular concrete 0.2-3.7. Water absorption of impregnated cellular concrete is 14.5-15.6%. 2 tab.

Description

one

The invention relates to the production of building materials and can be used to impregnate heat insulating products from cellular concrete with a density of 200-250 kg / m3.

The purpose of the invention is to reduce water absorption and the thermal conductivity coefficient in the wet state.

Cellular concrete with a density of 220 kg / m3, subjected to impregnation, is prepared using well-known technology from portland cement, ground (S 2500 cm / g) sand, aluminum PAP-1 powder with the following parameters: tarpaulin activity 41%; the degree of hydration in the patient is 13%; In / T concrete mix 0.71.

The following raw materials are used to prepare the proposed and known composition: liquid sodium glass, synthetic latex, silicone fluid NGL-10, calcium nitrate, sodium aluminate.

The composition is prepared as follows: liquid glass is loaded into the mixer and, with continuous stirring, calcium nitrate, ground to a specific surface of 2500 cm2 / g, cellular concrete of the same composition as the samples subjected to impregnation and silicone liquid GKZh-10 are introduced. All components are mixed for 10 minutes. The mixture is then introduced in small portions into a latex mixer and, after stirring for 15 minutes, a ready-to-use composition is obtained.

i t

The compositions of the proposed composition

are shown in table 1.

four

sj

CO 4 4 CO

The treatment of the products of the present and known compositions is as follows. Samples of heat insulating cellular concrete with a size of 6 x x 6 x 6 cm are immersed in the previously prepared composition and held for 3D c. Then the samples were placed on a wooden grid to drain an extra amount of the composition (they were kept on the grid for 30 minutes), the product was dried at 70 ° C for 5 hours.

To improve the moisture and strength characteristics of the dried layer of the composition, an additional polyethylene emulsion can be applied at a rate of 0.15 kg / m of the following composition, mag ..%:

Polyethylene wax acidified OS-20 Emulsifier

Triethanolamine Ethylene Glycol Water

Then it is dried at 60WC for 0.5-1 hours. The second layer of the coating - a film of polyethylene emulsion gives a slight increase in density (4-5 kg / m). 0

When liquid glass interacts with alkaline earth metal salts, as well as with silicates and calcium hydrosilicates, which are part of cellular concrete, sodium polysilicates are formed, which transform into a gel. As a result of the syneresis of the gel, the compaction and properties. Latex globules distributed between

25.8 - 26.2

5.6 - 6.6 1.4 - 2.2 1.4 - 2.2

Else v.

five

0

five

0

five

0

structural formations of liquid glass, play the role of a plasticizer and at the same time form a polymer film. The silicone organic hydrophobic liquid imparts water repellency to the walls of the pores and capillaries at a depth of 3-5 mm.

Physico-mechanical properties of the composition are presented in table 2.

The proposed composition can be recommended for the impregnation of heat insulating products made of cellular concrete with a density of 200-250 kg / m to increase the efficiency of heat treatment due to a decrease in water absorption and an increase in heat-shielding properties.

Claims (1)

Invention Formula Composition for impregnation of cellular concrete, including liquid glass, butadiene-latex latex and inorganic salt, which, in order to reduce water absorption and heat transfer coefficient in the wet state, contains sodium nitrate as an inorganic salt, additionally sodium ethyl silicate and fine ground cellular concrete in the following ratio of components, wt.%: Liquid glass Styrene butadiene latex Nitrate calcium Ethyl silicate on three Thin ground cellular concrete Table 3.59 69.7 85.98 25.0 5.0 61.85 54.147.95 75.85 30,035.0 40.0 20.0 6,07,08,04,0 Calcium Nitrate Sodium aluminate fine ground cellular concrete Density, kg / m Water absorption, vol.% Thermal conductivity at 25 ° С, W / () of samples dried to a constant mass of the samples after water absorption was determined by holding in water for 24 hours 266 264 263 261 258 272 20.7 15.1 14.5 15.6 19.4 20.4 0.074 0.073 0.073 0.073 0.073 0.075 0.159 0.130 0.127 0.131 0.149 0.151 0.1 P, 15 0.2 0.25 0.05 0.2 2.0 3.7 3.8 0.1