RU2132835C1 - Method of manufacturing non-pressure especially light concrete with cement binder - Google Patents

Abstract

FIELD: manufacture of building materials. SUBSTANCE: method consists in stirring binder with polystyrene foam, cement-polystyrene paste being mixed with process foam in high-speed foam-concrete mixer. In the course of mixing, electric power plant ashes and lump lime are added to mixture to achieve following contents of components, wt %: cement 25- 60, process foam 7-15, polystyrene foam 0.5-1.5, ashes 20-30, lump lime 5- 10, and tempering water - the balance. Process foam is prepared in gerotor-type foam generator with rotation speed of gerotor couple 1000- 1200 rpm. EFFECT: reduced production expenses and combustibility of building material. 2 cl, 1

Description

The invention relates to the field of building materials, and in particular to methods for producing autoclave-free foam concrete with a cement binder with a density of 250-350 kg / m ³ .

 There is a method of obtaining a heat-insulating material, in which, in order to reduce the foam mass precipitation in a high-speed mixer, foam is prepared, 7-25% filler (mineral wool) is introduced into it, and the resulting foam mass is mixed with a binder (see A.S. USSR N 1219572, class C 04 B 38/02, 1983).

 The known method does not allow to completely eliminate the sediment of the foam mass after pouring it into the mold and is characterized by a high content of mineral wool, which increases the cost of manufactured products.

 Also known is the raw material mixture for lightweight concrete and the method for its preparation, which consists in mixing cement binder and polystyrene foam with the introduction of chemical additives (see A.S. USSR N 1680674, class C 04 B 38/02, 1989).

 The disadvantage of this method is the high percentage of expanded polystyrene, which leads to increased production costs and increased combustibility of concrete.

 An object of the invention is to reduce production costs and combustibility of building material in the absence of precipitation of the concrete mass after pouring it.

 The solution to the technical problem is achieved by the fact that the cement binder is mixed with polystyrene foam, and the polystyrene cement dough is mixed with technical foam in a high-speed concrete mixer, in the process of mixing, TPP ash and lime-boiler are introduced into the prepared mixture, technical foam is obtained in the gerotor (rotor) type foam generator at a speed rotation of the gerotor pair 1000-1200 rpm

 In this technical solution, the sediment of the molding sand after pouring it into the mold is eliminated by introducing the minimum required amount of granular polystyrene foam, 5 times less than in the prototype. Part of the cement binder is replaced by TPP ash, which, due to a 30% lower grain density, reduces the air pore content in foam concrete. Due to the rapid extinguishing, the lime additive interacts with the silica contained in the ash and accelerates the setting of the foam concrete mixture.

The above statements are confirmed by the experimental data given in the table. Features of this technical solution ensure the production of autoclave-free foam concrete with a density of 250-350 kg / m ³ without precipitation of the foam concrete mixture after pouring.

Example. For the preparation of autoclave-free foam concrete with a density of 300 kg / m ³ , Portland cement 400, granular polystyrene foam of a fraction of 2.5 - 10 mm with a bulk density of 10 kg / m ³ , ash and slag mixture of thermal power plants are fine-grained with a specific surface of 400 kg / m ² according to GOST 25552-91 were used ground calcium lime according to GOST 9179. Technical foam based on a 1% solution of amine oxide was prepared in a gerotor-type foam generator with a gerotor pair rotational speed of 1000-1200 rpm.

The prepared foam concrete mixture was poured into a 10x10x10 cm mold and, after daily hardening under room conditions, during which the foam mass was measured, was subjected to heat treatment for 12 hours at a temperature of 80-85 ^o C. The samples were tested for compression 4 hours after stripping according to the GOST method 10180-90, the density of the samples in the dry state was determined according to GOST 12730-78.

Without the addition of ash, lime and polystyrene foam, the foam concrete mixture gave a mass sediment of 10-15 mm. The introduction of ash and lime into the foam concrete composition reduced the sludge mass to 2-3 mm. The addition of expanded polystyrene completely eliminated the sediment of the molding material even at a foam concrete density of 250 kg / m ³ .

Claims (1)

1. A method of obtaining autoclave-free, especially lightweight cement binder concrete, which consists in mixing a cement binder with polystyrene foam, characterized in that the prepared cement-polystyrene dough is mixed with technical foam in a high-speed concrete mixer, in the process of mixing, TPP ash and lime-lime are introduced into the prepared mixture in the following ratio of components, wt.%:
Cement - 25 - 60
Technical foam - 7 - 15
Expanded polystyrene - 0.5 - 1.5
Ash TPP - 20 - 30
Boiling lime - 5 - 10
Mixing Water - Else
2. The method according to claim 1, characterized in that the preparation of technical foam is carried out in a gerotor-type foam generator with a gerotor pair rotating at a speed of 1000-1200 rpm.

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