RU2304569C2 - Polystyrene concrete mix - Google Patents

Abstract

FIELD: manufacture of building materials; erection of bearing-wall buildings.

SUBSTANCE: proposed composition contains cement, expanded polystyrene, water-soluble polymer on base of cellulose esters, surfactant on base of long-chain olefin sulfonates. Expanded polystyrene includes granules of two fractions whose diameters differ by 1.5-3.0 times; mass ratio of fine fraction to coarse fraction is 3:1 to 1:1 at diameter of fine fraction from 0.5 mm to 1.5 mm. Combination of components makes it possible to form polystyrene concrete mix suitable for filling vertical and horizontal joints of external wall panels and sealing-up the seams.

EFFECT: enhanced reliability; improved heat-insulating properties of joints.

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Description

The invention relates to the field of building materials and can be used to improve the reliability and thermal insulation properties of joints and seams of external wall panels during the construction of panel buildings and as a heater

The prior art polystyrene concrete (polystyrene cement) mixture, including mineral binder - cement, polystyrene granules and various additives (plasticizers, surfactants, filler, etc.) that improve the properties of solutions of concrete mixtures and hardened concrete (SU 220818 A , С04В 16/08, 1968; SU 334199, С04В 16/08, 1972; SU 490776, С04В 16/08, 1975; SU 583990 A, C04B 16/08, 1976; SU 1449555 A, С04В 16/08, 1989; SU 1616876 A, С04В 16/08, 1990; RU 1724620 A1, С04В 16/02, 1992).

However, the solutions prepared from these polystyrene concrete mixtures, with all the variety of component ratios and additive composition, are not very suitable for filling the vertical joints and seams of the outer wall panels due to their delamination, low durability, low ductility and relatively high heat capacity.

The invention is directed to the creation of a polystyrene concrete mixture suitable for technologically simple and reliable filling of vertical and horizontal joints of external wall panels and sealing joints with improved strength and thermal insulation characteristics, and as a heater for building envelopes.

The solution to this problem is provided by the fact that a polystyrene concrete mixture, including cement, granular polystyrene foam and a surfactant based on long chain olefin sulfonates, according to the invention additionally contains a water-retaining additive - a water-soluble polymer based on cellulose ethers with a viscosity of 2% aqueous solution at 20 ° C is not less than 6000 MPa · s, and polystyrene foam includes granules of two fractions, the diameters of which differ by 1.5 ÷ 3.0 times, with the following ratio of components, parts by weight:

Cement 20 ÷ 22

Expanded polystyrene granules 1.0 ÷ 1.6

Surfactant 0.005 ÷ 0.015

Water-retaining additive 0.05 ÷ 0.08

In addition, the mass ratio of the fine fraction to the coarse fraction is 3: 1 ÷ 1: 1 with a diameter of granules of the fine fraction from 0.5 mm to 1.5 mm.

The introduction of the components of a water-retaining additive in the form of a water-soluble polymer based on cellulose ethers improves adhesion, increases the dispersion and viscosity of a solution prepared from a polystyrene concrete mixture, its water-holding ability and durability, and the use of additives based on long-chain olefin sulfonates as a surfactant increases the elasticity, wettability and efficiency of pore formation of the solution, reduces the formation of shrinkage cracks and cracks in quently internal stresses concrete embedment of the joint. At the same time, the claimed mass ratio of the components as a whole in combination with the use of two-fraction granular polystyrene foam improves the structure of concrete, provides technologically simple and reliable filling of both horizontal and vertical joints, increases its strength and reduces thermal conductivity.

A polystyrene concrete mixture is prepared, as a rule, in the form of a dry mixture by mixing the dry components in the claimed ratio of mass parts as follows.

In the mixer load 20 wt.h. Portland cement;

1.2 parts by weight polystyrene concrete granules with a density of 15 ÷ 20 kg / m ³ (fractions 1 ÷ 1.2 mm - 0.8 parts by weight, fractions 2 ÷ 2.3 mm - 0.4 parts by weight);

0.01 parts by weight a surfactant based on long chain olefin sulfonates with anionic iogenicity and a content of sodium sulfate up to 5.5% and sodium carbonate up to 4%;

0.06 parts by weight water-retaining additive is a water-soluble polymer based on cellulose ethers (methyl cellulose, methyl hydroxyethyl cellulose, etc.) with a viscosity of 2% aqueous solution 4 at 20 ° C of at least 6000 MPa · s, and the components are thoroughly mixed until a homogeneous mixture is obtained.

To fill the junction of the outer wall panels, a polystyrene concrete solution is prepared by mixing one part by weight in a mixer. dry polystyrene concrete mixture of the claimed composition with 0.8 ÷ 1.2 wt.h. water. The resulting solution, which is characterized by homogeneity, ductility, high adhesive ability, does not separate and does not separate water, technologically simply and reliably fills joints, including deep vertical butt wells, which ensures enhanced performance of the latter.

Table 1 Components The content of components in the compositions, parts by weight one 2 3 four 5 Portland cement eighteen twenty twenty 22 23 Polystyrene granules 0.8 1,0 0.8 1,2 1,6 Fractions 1
Fractions 2 0.8 0.5 0.4 0.4 0.4 Surface-active substance 0.02 0.015 0.01 0.005 0.003 Water retention additive 0.1 00.5 0.06 0.08 0,03 Granules fraction 1 1/1 2/1 2/1 3/1 4/1 Granules fraction 2

table 2 Indicators Compositions one 2 3 four 5 Heat conductivity coefficient, W / m С ° 0,065 0,068 0,068 0,070 0,074 The compressive strength after 28 days, MPa 0.48 0.53 0.55 0.56 0.58 Water separation, g / l 6 5 5 four 6 The mobility of the cone, cm 15.8 16.1 16.1 16,2 16,0 The density in the dry state, kg / m ³ 0.19 0.21 0.21 0.23 0.24 Density in the fresh state, kg / m ³ 0.26 0.29 0.29 0.32 0.33

Claims (1)

A polystyrene concrete mixture for filling the joint of external wall panels, including cement, granular polystyrene foam and a surfactant, characterized in that it additionally contains a water-retaining additive - a water-soluble polymer based on cellulose ethers, and polystyrene foam includes granules of two fractions whose diameters differ by 1.5 -3.0 times, and the mass ratio of the fine fraction to the large fraction is 3: 1-1: 1 with a diameter of the granules of the fine fraction from 0.5 to 1.5 mm in the following ratio of components, wt. hours: Cement 20-22 Polystyrene granules 1.0-1.5 Surface-active substance 0.005-0.015 based on long chain olefin sulfonates Water retention additive 0.05-0.08.