SU1493634A1 - Method of producing heat insulation articles - Google Patents

Abstract

The invention relates to building materials and relates to methods for manufacturing heat insulating products based on expanded perlite. The purpose of the invention is to reduce the consumption per visitor while increasing the strength of the products. The essence of the method is that the mixture is pre-compacted before being placed into a mold. The preliminary compaction of the mixture consists in its mechanical processing, which leads to the abrasion of the pearlite grains and an increase in the density of the mixture, as a result of which the intensity of the subsequent compaction in the form decreases. On the basis of expanded perlite with a bulk volume mass of 70 kg / m ³ and portland cement, the proposed method produces heat insulating products with an average density of 250-700 kg / m ³ , with compressive strength of 0.35-0.4 MPa. Cement saving is 30% per 1 m ^{3 of} product. Strength increased by 15%. 1 tab.

Description

The invention relates to construction materials, in particular, to methods for producing heat insulating products based on expanded perlite.

The purpose of the invention is to reduce the flow rate to the user while increasing the strength of the products.

The pre-compaction of the mixture consists in its mechanical processing, leading to abrasion of the pearlite grains and an increase in the density

mixes. Pre-compaction of the mixture can be carried out by additional mixing of the prepared mixture in forced-action mixers, by rolling between rollers or transport tapes, by pressing.

Precompaction of the Mixture prior to placing it in the mold allows reducing the intensity of compaction in the mold.

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Example. Thermal insulation products are manufactured with an estimated average density of 300 kg / m. The valuable perlite sand with a bulk bulk mass of 70 kg / m is mixed with Portland cement and water in a ratio of (mass%) 44: i20: 36, respectively. The resulting mixture is pre-compacted by additional mixing it in a mortar mixer, after which the mixture is placed and compacted on a vibrating plate with weights. The maximum possible intensity of compaction with the equipment used is 0.2 MPa,

In order to reduce the flow rate to the user while increasing the strength of the products after pre-compaction, the total density of the mixture must be offset by inequality

J. 100 / V T. A.

an + C1 + dA

100 an + (1 + o) au,

,

(one)

And Jl - 100 + 0 ..

 1o, 11th- 1.6

100 -I- 0.5a8

20

and.

five

0

five

0

si in the form of the equipment used, Mpa

For this example, the inequality. (1) has the form 250 G cm 325 „

As a result of additional mixing of the mixture in a mortar mixer for 8 min, the density of the mixture was 260 kg / m, which satisfies the inequality

The mixture laid in the form was compacted with vibration with a frequency of 50 Hz, an amplitude of oscillations of 0.5 mm, and an attachment of 30 g / cm. The products were subjected to steaming mode 2-6 (), natural growth,

The table shows the results of comparative tests of the thermal insulation material obtained by the proposed and known methods.

Claims (1)

Invention Formula A method of manufacturing heat-insulating products, including mixing expanded perlite into stinging and water, laying the resulting mixture into a form, then compressing it and heat treating it, so that in the form of pre-compaction de Tp but. “6 o (  average density of the heat insulating product, bulk bulk of expanded perlite, content of expanded perlite sand in the mixture, mas%} the cement content in the mixture, wt.%; water content in the mixture, wt.X; coefficient determining the quantity of bound water; maximum intensity of compaction Way Indicator ProposalFamous eatable Cement consumption, kg / m 95 Water consumption, 5 Average material density, kg / m 300 Compressive density, MPa 3.9 151 266 300 3.4