SU1222558A1 - Method of manufacturing building heat-insulating articles - Google Patents

Description

one

The invention relates to the building materials industry and can be used in the manufacture of reinforced light concrete slabs and wall panels for industrial, agricultural and civil buildings.,

The aim of the invention is to increase the thermal insulation properties of products and reduce labor costs.

The method consists in the fact that after the product is molded during the extraction process of the core-forming agents, the voids are filled with porous sand by cyclic feeding for 25-30 seconds and compressed with compressed air under a pressure of 0.2-0.3 MPa for 25-30 seconds.

The method is carried out as follows.

Fill the mold with empty-concrete mixers installed in it (concrete grade M50-200) with constant vibration, then close the end sections of the voids with lightweight concrete inserts on the solution and subject it to aging for 2-3 hours to set the concrete. Then the filling is carried out with a pus-. When emptying by emptying porous perlite sand at a pressure of 0.2-0.3 at. At lower pressure, the sand in the voids is not sufficiently compacted, and the pressure above 0.3 ati leads to undesirable energy overruns in the air and sand supply system. The supply of perlite sand is carried out cyclically, in intermittent portions. Each void filling cycle in products is 1/4 - 1/3 of the volume of voids, the duration of each sand feeding cycle is 25-30 seconds. After an exposure of 25–30 s, during which an additional compaction of the sand feed with air takes place, the void-forming elements are moved 1/4 to 1/3 of the product's length again and the porous sand is simultaneously fed. The entire cycle of filling the voids of a lightweight concrete product with porous sand, along with its compaction intervals, lasts 3.5-4 minutes.

After filling the voids with porous sand and removing the voiding agents, the end sections of the voids are covered with liners and the product is subjected to steaming.

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Example 1. Blank holders are installed in the mold, reinforcement is placed and filled with lightness. concrete mix at a constant vib-.

5 drawing. Before removing the holders, the end sections of the voids are covered with liners and the molded product is released for 2.5 hours. Then the holders are removed and at the same time the perlite sand under pressure of 0.3 bar is supplied for 28 seconds, the sand is compacted with compressed air also under pressure 0.3 ati. Common cycle

15, void filling and void forming is 4 minutes. The end areas of the voids are covered with concrete liners and the product is steamed for 9 hours.

20 Example 2. Construction heat-insulating products are made, for which hollow-forming agents, reinforcement and concrete mixture are placed in the mold. Then

25 compact the concrete mix. On one side, the end sections of the voids are covered with inserts, after which the molded product is kept for 2.5 hours. The vacuum collectors are then removed, and the voids are filled with perlitic sand, which is fed cyclically under a pressure of 2 MPa for 30 seconds while simultaneously pulling void formers and packs are compressed with compressed air at a pressure of 0.2 atm for 30 s with the stationary position of the void formers. The void filling cycle is 4.5 minutes. The end areas of the voids are covered with concrete inserts and the product is sent for heat treatment.

Example 3. The product is molded in the same way as in Examples 1 and 2. When removing void forming agents, voids are filled cyclically - feeding perlite sand under pressure of 0.25 bar for 25 seconds while simultaneously removing the void former and compacting sand in voids with compressed air under pressure 0.25 ati for 25 s with a stationary core.

The total void filling cycle is 3.5 minutes.

55 The subsequent heat treatment is carried out analogously to examples 1 and 2.

The test results are presented in the table.

40

45

Coating plates

2.7

2.14

Up to 1-1,5m 0,35

Editor A.Vorovich

Compiled by N. Kashurniko.v

Tehred O.Sopko Proofreader A.Ferents

Order 1658/18 Circulation 555Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch PPP Patent, Uzhgorod, Proektna St., 4

, 84

31.1

1.47 times

, 6

28.0

1.33 times

In industrial, civil and agricultural buildings of lightweight concrete with a bulk weight up to 1500 kg / m

21.1 1

Only in industrial buildings made of lightweight concrete with a low bulk density - up to 1000–1100 kg / m3

Claims (1)

METHOD FOR PRODUCING CONSTRUCTION HEAT-INSULATING PRODUCTS, including laying concrete mixture in a mold with hollow formers, compacting it, extracting hollow formers and filling voids with porous sand, characterized in that, in order to increase the heat-insulating properties of the products and reduce labor costs, the voids are filled by cyclical feeding for 25-30 s and compaction with compressed air under a pressure of 0.2 - 0.3 bar for 25-30 s, moreover, the extraction of blanks is carried out during the supply cycles istogo sand. to to to JV JV □ o ¹ 12