RU2542011C1 - Raw material mixture for autoclave foam concrete - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: raw material mixture for autoclave foam concrete contains, wt %: Portland cement 24.97-25.18, siftings of rubble , obtained by sifting building wastes from dismantling of buildings and constructions on sieve No. 5, which contain, wt %: heavy concrete breakage, represented by low-basic hydrosilicates - 80%, ceramic brick breakage - 16%, chip, polystyrene, bituminous concrete, broken glass - 4%, milled to specific surface 430 m²/kg 42.68-43.58, milled quicklime 1.54-2.59, protein-based foaming additive 0.23-0.24, water - the remaining part.

EFFECT: reduction of thermal conductivity coefficient of autoclave foam concrete obtained from raw material mixture, wastes utilisation.

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Description

The invention relates to the field of building materials, in particular to cellular concrete autoclaved.

A known raw material mixture for the manufacture of foam concrete containing Portland cement, sand, lime, water and a complex protein-based foaming additive in the following ratio of components, wt.%: Cement - 38-42, sand - 28-30, lime - 4.2-4 , 6, a protein-based complex foam-forming additive - 0.4-0.7, water - 25.4-26.7 (RU No. 2205814, C04B 38/10, 05/06/2002).

Closest to the claimed mixture is a mixture for the manufacture of autoclaved foam concrete, consisting of cement, quicklime, sand, waste-trimmings, water and a foam-based additive on a protein basis in the following ratio of components, wt.%: Cement - 17.52-19, 90, lime - 6.9-7.18, sand - 26.8-27.8, waste-trim - 18.37-19.25, foam-based additive on a protein basis - 0.23-0.24, water - 27.80-28.01 (RU No. 2394796, C04B 38/10, 05/04/2009).

The disadvantages of these mixtures are insufficiently high heat-shielding properties in terms of thermal conductivity of the material.

The objective of the invention is the creation of a new mixture, providing autoclaved foam with improved thermal characteristics, namely with a reduced coefficient of thermal conductivity.

The problem is achieved in that the raw material mixture for autoclaved foam concrete, including Portland cement, quicklime powder, protein-based foaming additive and water, additionally contains as a filler the screening of secondary crushed stone obtained by screening on sieve No. 5 of building waste from the dismantling of buildings and structures, containing, wt.%: heavy concrete battle, represented by low-basic hydrosilicates - 80%, ceramic brick battle - 16%, wood chips, polystyrene, asphalt concrete, cullet - 4%, ground to specific . spine 430 m ² / kg, with the following ratio of components, wt%:

Portland cement 24.97-25.18 specified screening of secondary crushed stone 42.68-43.58 specified lime 1.54-2.59 specified foaming additive 0.23-0.24 water rest.

The invention consists in reducing thermal conductivity by complicating the structure of the stone layer and the formation of a more uniform porous structure.

EXAMPLE OF SPECIFIC PERFORMANCE

Production of autoclaved foam concrete

1. Preparation of raw materials:

- grinding screening of secondary crushed stone to a specific surface of 430 m ² / kg.

2. Dosing and loading into the mixer of raw materials:

- water corresponding to GOST 23732-79;

- quicklime, with a quenching rate of up to 8 min and containing active calcium oxide and magnesium oxide of not less than 70%, “burn-out” of not more than 2% with a specific particle surface of 600-620 m ² / kg;

- Portland cement PC 500 D20 with a tricalcium aluminate content of not more than 6%;

- screening of secondary crushed stone obtained by screening on sieve No. 5 of construction waste from dismantling buildings and structures, 80% consisting of heavy concrete bout, represented by low-basic hydrosilicates. The remaining components are represented by a ceramic brick fight (16%) based on Cambrian clay with a firing temperature of 980 degrees, wood chips, polystyrene, asphalt concrete, window glass cullet (4%).

3. Mixing the raw materials in the mixer.

4. Porization of the mixture due to separately prepared foam from a solution of a foaming additive. The following brands can be used as a foaming additive: Addiment SB 31L (trademark RENIMENT SB 31L, manufacturer SIKA ADDIMENT GmbH B-69171 Leimen, Germany, the base is protein hydralizates, a dark brown liquid, the pH range of foaming: 6-10 (Khitrov A.V. Abstract on the competition of the academician of technical sciences “Technology and properties of foam concrete, taking into account the nature of the foam introduced.” St. Petersburg, PGUPS, 2006)), “FoamCem” (the main active substance - protein hydrolyzate; scope: foaming agent for the preparation of lightweight cellular concrete; manufacturer Laston Italiana SPA), "Neop p "(manufactured Neopor System GmbH, Germany, the base protein, dark-colored liquid, surface tension of 45-55 J / m ^2, foam pH interval: 6-8 (AV Khitrov Abstract on scientific article by uch.. so-called “Obtaining modern autoclaved foam concrete, taking into account the nature of the introduced building foams.” St. Petersburg: PGUPS, 2000)).

5. Transportation of the foam mixture into the holding chamber and its laying in the molds.

6. Exposure of foam arrays to a set of cutting strength of about 0.028 MPa.

7. Cutting foam arrays into products.

8. Autoclave processing of products.

9. Samples of foam concrete products after autoclaving are tested for thermal conductivity (GOST 31359-2007), the results are presented in the table.

An analysis of the results shows that autoclaved foam concrete based on the proposed composition has a reduced coefficient of thermal conductivity, in addition, along the way, the effect of recycling mineral waste in the form of screening of secondary crushed stone is achieved.

Table No. p / p The average density, kg / m ³ The composition of the foam, wt.% Thermal conductivity coefficient λ, W / (m · K) Prototype 600 Portland cement - 17.52-19.90, 0.16 ground quicklime - 6.9-7.18, sand - 26.8-27.8, trimmed waste - 18.37-19.25,
foaming additive Addiment SB 31L - 0.23-0.24, water - 27.80-28.01 one 600 Portland cement 24.97 0.13 screening of secondary crushed stone 42.68 quicklime powder, ground 1.54 foaming additive Addiment SB 31L 0.23 water 30.58 2 600 Portland cement 25.07 0.13 screening of secondary crushed stone 43,13 ground quicklime 2.07 foaming agent Addiment SB 31L 0.235 water 29,495 3 600 Portland cement 25.18 0.13 screening of secondary crushed stone 43.58 quicklime powder, ground 2.59 foaming additive Addiment SB 31L 0.24 water 28.41

Claims (1)

The raw material mixture for autoclaved foam concrete containing Portland cement, quicklime powder, protein-based foaming additive and water, characterized in that it additionally contains screening of secondary crushed stone obtained by screening on sieve No. 5 of building waste from the dismantling of buildings and structures, containing, wt.% : heavy concrete battle, represented by low-basic hydrosilicates - 80%, ceramic brick battle - 16%, wood chips, polystyrene, asphalt concrete, cullet - 4%, ground to a specific surface of 430 m ² / kg, with the following ratio components, wt.%:
Portland cement 24.97-25.18 specified screening of secondary crushed stone 42.68-43.58 specified lime 1.54-2.59 specified foaming additive 0.23-0.24 water rest