RU1797600C - Concrete mix for manufacturing thermoinsulating plates - Google Patents

Abstract

Usage: production of concrete mixtures for the manufacture of insulating boards intended for the installation of floors of low-rise construction. The inventive concrete mixture additionally contains, wt.%: Portland cement 23.5-27.9: sodium chloride 0.07-0.2; boric acid 0.01-0.07; dextrin 0.01-0.04; cork waste 20.31-30.01; expanded clay 28.51-46.38; water - the rest. The thermal conductivity of concrete is up to 0.21W / (m.k.). 1 tab.

Description

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The invention relates to concrete mixtures for the manufacture of insulating boards for flooring of low-rise buildings.

A concrete mixture is known, including, wt.%: Portland cement 21.0-23.0; expanded clay sand fractions 0.14 mm 1.0-1.9, fractions 0.14-0.35 mm 6-6.9, fractions 0.35-0.63 mm 8.0-8.9, fractions 0, 63-1.0 mm 5.0-5.8; expanded clay gravel 27.0-30.0; air-entraining additive 0.4-0.5; wood or goose-crushed fractions of 10-20 mm 7.2-9.68; clay 0.8-1.32; water - the rest.

The closest to the invention in technical essence and the achieved result is a concrete mixture, including, wt.%: Portland cement 14.58-24.69; placeholder 62.96-80.31; citric acid 0.00073-0.0741; sodium chloride 0.073-0.247; water is the rest.

A disadvantage of the known solution is its low thermal conductivity.

The purpose of the invention is to reduce the coefficient of thermal conductivity.

For this purpose, the concrete mixture for the manufacture of heat-insulating boards, including Portland cement, sodium chloride, acid, aggregate and water, contains boric acid as an acid, additionally dextrin, and filler as plug waste and expanded clay in the following ratio, wt.%: Portland cement 23.5-27.9 Sodium chloride 0.07-0.2 Boric acid 0.01-0.07 Dextrin 0.01-0.04 Cork waste 20.31-30.01 Expanded clay 28.51-46.38 Water Else For experimental verification of the proposed concrete mixture prepared three composition, PRI me R 1. Concrete the mixture is prepared from Portland cement M50Q, expanded clay (standard mixture: with a fraction of 5-10 mm 40% and with a fraction of 10-20 mm 60%), cork waste

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industrial production with a particle fraction of 10-30 mm; additives are added to the concrete mixture with mixing water. The composition of the concrete mixture, wt.%: Portland cement M-50023.5 Expanded clay ... 46.38 Cork waste 20.31 Sodium chloride 0., 2 Boric acid 0.01 Dextrin 0.04 Water. ; 9.56 Cement, water and additives are metered by weight with an accuracy of ± 2%. Expanded clay and cork waste are dosed by the volume-weight method with an accuracy of ± 3%.

The preparation of expanded clay-concrete-concrete mixture is carried out in forced-action cyclic mixers. Stripes of a conveyor belt are attached to the spiral blades of the mixers to prevent the expanded clay and the cork from grinding due to stirring.

The loading of expanded clay concrete components into the mixer is carried out in the following sequence: loading of the total amount of cement and expanded clay, 2/3 of the amount of water and the total amount of chemical additive; mixing for 3 ... 5 min; loading the entire amount of cork and the remaining amount of water, taking into account the additive used to dissolve; stirring until a homogeneous mixture is obtained for 3 ... 4 minutes. Expanded clay mixture during horizontal molding is laid through a vibrating nozzle with simultaneous compaction on a vibrating platform for 30 ... 45 using vibropruss.

The prepared concrete samples are steamed according to the 4 + 2 + 6 + 2 mode at 65 ° С (exposure + rise + isothermal heating + cooling).

Testing for physical and mechanical characteristics showed that keramsitoprobkobeton has a compressive strength of 1.0 MPa, a water resistance of 0.9 MPa, a thermal conductivity of 0.25

W / (m.k.) ...:; -.: ...

0

5

0

5 0 5

0

5

PRI me R 2. Prepare a concrete mixture according to

Example 1..

The composition of the concrete mixture, wt.%:. Portland cement M-50025.7 Expanded clay 32.10 Cork waste 30.01 Sodium chloride 0.1 Boric acid 0.07 Dextrin 0.03 Water 9.86 Durability of expanded clay concrete samples 8.5 MPa, water resistance 0.9

MPa, thermal conductivity coefficient 0.21

W / (m.k.)

Sample Ready for concrete mix

example 1. The composition of the concrete mixture, wt.%: Portland cement M 50027.9-Expanded clay 28.51 Cork waste 30.01 Sodium chloride 0.07 Boric acid 0.03 Dextrin o, O1 Water 13.47 Strength of samples from expanded clay concrete 8, 5 MPa, water resistant

0.21 W / (m.k.).

Physico-mechanical properties of concrete mixtures are given in the table.

Formula of the invention Concrete mixture for the manufacture of heat-insulating boards, including Portland cement, sodium chloride, acid, aggregate and water, it is noteworthy that, in order to reduce the thermal conductivity of concrete, it contains acid boric acid, as filler - waste cork and expanded clay and additionally dextrin in the following ratio of components, wt.%:

Portland cement 23.5-27.9 Sodium chloride 0.07-0.2 Boric acid 0.01-0.07 Dextrin 0.01-0.04 Cork waste 20.31-30.01 Expanded clay 28.51-46.38 Water The rest.