SU1206257A1 - Raw mix for producing cellular concrete - Google Patents

Description

one.

The invention relates to the building materials industry and can be used to make cellular concrete products.

The purpose of the invention is to increase the strength of concrete to bend and reduce the precipitation of the mixture.

The inclusion of polyvinyl acetate (PVA) and polyvinyl chloride (PVC) in a cheeto-concrete mixture in combination with the addition of alkali metal bicarbonate, for example sodium bicarbonate, at a specified ratio of alkyl sulfate (foaming agent) and alumina powder (gas generator) provides a certain ionic composition of the liquid Preferably foamy porisation of the mixture during turbulent mixing.

A high degree of porisation of the mixture, corresponding to the production of products with a bulk weight of 150–200 kg / m, is achieved with 75–85% foam and 15–25% gas pores in concrete. At the same time, the porous mixture, after being poured into the mold and swelling, is characterized by high elasticity and, at the same time, resistance to precipitation (gas holding capacity), i.e. volume stability at the preliminary stage and heat treatment of concrete. This in turn causes an increase in bending strength and crack resistance of products. Chemistry combination

24

thirty

34

20

thirty

3 1,4200,060,25

2 1,0150,100.30 1 0.6100.120.35

43350,20,2 0,04

1.5 1250.250.3 0.15

ten

15

06257

In addition, blends can be used to make large castings (blocks) of cellular concrete for subsequent cutting into slabs and blocks 5 of the required size.

Example. To prepare the proposed blender mixture and to obtain cellular concrete, three mixtures of the components are prepared by mixing in a turbulent mixer. At the same time, two known mixtures are prepared, differing from the type of chemical additives proposed. The compositions of the known and proposed mixtures are given in the table.

The mixtures are used to form slabs of 100x400 600 mm in vertical (cassette) form, which are subjected to steaming at a mode of 3 + 6 + 3 hours and then dried at 105-110 ° C to constant weight. Cm cubes and cm prisms are inserted from the slabs to determine the strength characteristics of the concrete. The stability of the mixture is evaluated by the size of its precipitation after pouring it into the mold and swelling. Physico-mechanical characteristics are shown in the table.

As can be seen from the table, the heat insulating cellular concrete from the proposed mixture with the same bulk density with a known thickness is characterized by lower precipitation after expansion and higher strength.

Offered

 Compressive strength Flexural strength

Editor I. Derbak

Compiled by O. Motorina

Tehred I.Astalosh Corrector V. Sinitska

Order 8642/24 Circulation 6 (undersigned

VNIIPI USSR State Committee

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

Branch mill Patent, Uzhgorod, st. Project, 4

Table continuation

Claims (1)

RAW MIXTURE FOR PREPARATION OF CELLULAR CONCRETE, including Portland cement, lime, gypsum, coal ash, aluminum powder, alkyl sulfate, high-polymer emulsion and water, cast 24-34 1-3 0.6-1.4 10-20 0.06-0.12 0.25-0.35, which, in order to increase bending strength and reduce precipitation, it contains as a high polymer emulsion a copolymer of polyvinyl acetate and polyvinyl chloride and additionally an alkali metal bicarbonate in the following ratio components, ma.Z: Portland Cement Lime Gypsum Coal ash Aluminum powder Alkyl sulfate Copolymer of polyvinyl acetate and polyvinyl chloride Alkali metal bicarbonate Water 4-10 0.08-0.2 Else S1L „> 1206257>