RU2403231C2 - Dry mixture for heat-insulating non-autoclave porous foam concrete - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention relates to production of building materials and articles made from cellular concrete and can be used in cellular concrete article factories and in monolithic construction, as well as for making heat-insulating slabs. The dry mixture for making non-autoclave porous foam concrete contains the following, kg: portland cement 515, aluminium powder 2.2, superplasticisers Melment F 10 and Melflux 1641 F 0.83, Esapon 5.15.

EFFECT: higher quality of porous foam concrete and broader technological capabilities for its use.

1 ex

Description

The invention relates to the production of building materials and products from cellular concrete and can be used in factories of cellular concrete products and in monolithic construction, as well as for the manufacture of insulating boards.

A known dry mixture for the preparation of non-autoclaved aerated concrete, including Portland cement, quicklime, ground sand and aluminum powder, characterized in that it additionally contains textile cord in the following ratio of components, wt.%:

Portland cement 40.1-45.8 Lime 8.1-9.2 Ground sand 41.3-48.0 Textile cord 3,5-8,5 Aluminum powder 0.210-0.214

(RU 2304127, IPC С04В 38/02, 2007)

A dry mixture is known, including Portland cement, aggregate, filler, blowing agent, a gas-forming additive - aluminum powder, a foaming additive, Melment superplasticizer, hardening at a temperature of 18-22 ° C (Bazhenov Yu.M. Technology of dry building mixes. Publishing House Association of building universities, Moscow , 2003, p. 5, 18, 43, 47, 58, 59, 61).

The disadvantages of dry mixes for the preparation of non-autoclaved aerated concrete are low strength and high shrinkage deformation.

The objectives of the invention are to remedy these disadvantages of foam concrete, expanding the technological capabilities of its use, as well as improving the quality of foam concrete.

The technical result is achieved by the fact that the dry mixture for non-autoclaved foam gas concrete, including Portland cement, aluminum powder, a foaming agent and Melment superplasticizer, contains Melment F 10 and additionally Melflux 1641 F as a superplasticizer, and Esapon as a foaming agent in the following ratio of components, kg :

Portland cement 515 Specified Superplasticizers 0.83 Aluminum powder 2.2 Esapon 5.15

The introduction of a metered amount of Melflux 1641 F superplasticizer into the mixture (manufactured by the German company SKW Trostberg AG) provides the optimum viscosity at which the composite structure does not break during gas evolution. At the same time, during the process and after setting of the mixture, no shrinkage is observed.

Melflux ^® 1641 F

Melflux 1641 F superplasticizer - white powder with bulk density, g / dm ³ 450-750. The chemical base is melamine formaldehyde polycarboxylate. The production method is spray drying from a solution obtained by polycondensation. Volatile (loss upon heating) - wt.% Max. 4.0, max. pH of a 20% solution at 20 ° C 9-11.5.

Melment Superplasticizer is a spray-dried melamine-based polycondensation powder obtained by spray drying. Technical data: form - white powder; bulk density - 450-750 g / l; heat loss - max. 4.0 wt.%; A 20% solution at 20 ° C has a pH of 9.0-11.4. Melment superplasticizer is optimized to plasticize and reduce water consumption for cement-gypsum mixtures.

Esapon blowing agent is a surface-active additive in the form of a fine white powder, which finds universal application in stable air pores. It is used in dry mixtures together with cellulose ethers, redispersible powders and other surface-active modifiers. Esapon acts as a wetting agent and plasticizer in mortars, improves processing and consumer properties. Esapon pore formation enhances mortar elasticity and prevents shrinkage and cracking. This increases frost resistance and reduces the risk of efflorescence. Composition - sodium lauryl sulfate. The combination of Esapon blowing agent and aluminum PAK powder provides uniform throughout the volume and optimal in time, in accordance with the hardening period, creation of a uniform porous structure of the composite.

The preparation of the mixture for non-autoclaved foam-gas concrete involves grinding the raw dosage components in a dry form in a ball mill and packing them in bags.

Example.

Portland cement manufactured by CJSC Belgorodsky Cement of CEM I 42.5 grades in the amount of 515 kg is mixed with Melflux 1641 F and Melment superplasticizers in the amount of 0.83 kg (in this example, the ratio Melflux 1641 F / Melment = 1 / 1.5 in a mixture of plasticizers , but it can be different), add 5.15 kg Esapon blowing agent and 2.2 kg aluminum powder and mix everything thoroughly and grind, for example, in a ball mill, then put it in bags. The mixture for the preparation of foam concrete is used directly at the construction site.

The resulting foam concrete is characterized by the following indicators:

average density - 402 kg / m ³ compressive strength - 1.05 MPa thermal conductivity - 0,067 W / (mK)

The foam gas concrete obtained from this mixture has low shrinkage and meets high consumer requirements.

Claims (1)

A dry mixture for the production of non-autoclaved foam-gas concrete, including Portland cement, aluminum powder, a foaming agent and Melment superplasticizer, characterized in that it contains Melment F 10 and additionally Melflux 1641 F as a superplasticizer, and Esapon as a foaming agent in the following ratio of components, kg:
Portland cement 515 specified superplasticizers 0.83 aluminum powder 2.2 Esapon 5.15