SU1303595A1 - Composition for making pulverulent mixture porous - Google Patents

Abstract

The invention relates to the building materials industry, namely the production of cellular concrete using air-entraining compositions. The aim of the invention is to reduce the density and improve the uniformity coefficient. The composition contains the following components, sodium alkyl sulfate 20-70; triethanolamine alkyl sulfate 15-45; monoethanol- med 5-18; liquid glass - the rest. The use of this invention provides improved heat-shielding properties. 1 tab. S 5S with SP sat

Description

The invention relates to the building materials industry, namely the manufacture of cellular concrete products.

The purpose of the invention is to reduce the density and increase the homogeneity coefficient of the mixture.

Sodium and triethanolamine (TEA) salts of alkyl sulphates have the same surface activity at the fO liquid-gas (LC) interface with static methods for its creation. At the same time, sodium alkyl sulfates have a higher rate of adsorption on the L – D section and, as a result, air is more intensively involved in the process of pene-evaporation of the mixture. However, the average time of existence of a gas bubble obtained from an aqueous solution of sodium alkylsulfate is 20 tons, does not exceed 40-60 s.

TEA alkyl sulfates have a lower rate of adsorption on the G – H boundary compared to sodium alkyl sulfates, but provide more stable gas bubbles. The main reason for this difference is the greater viscosity of aqueous solutions of TEA alkyl sulfates.

When comparing the properties of the proposed frother with the prototype, the foam mass was prepared in an effective one-step process - by aeration in a turbulent mixer. Water, ground sand, cement, lime were successively dosed into the mixer, and mixed for 45–60 s, followed by the foaming agent and the mixture was mixed for 150–180 s. The porous mixture was poured into molds, kept up to a strength of 0.3 MPa, after which it was autoclaved under an overpressure of steam 1, OMPa.

The average concrete density and compressive strength according to GOST were determined, the homogeneity of concrete was evaluated by the distribution of CaO + + MgO in its volume, the coefficient of structural quality was calculated as the ratio of compressive strength to the square of the density of concrete.

The table presents the characteristics of the materials obtained.

From the data in the table it can be seen that the proposed formulations, whose ingredients are within the proposed limits, as compared with

Mono-ethanol-amide (MEA) synthetic marginal ratios of provision of fatty acids (FFA) do not involve air, but are very good foam stabilizers if the half-life of foams (characterized by a 10–17% lower density of concrete, greater by 10- 30% strength, increased coefficient of material homogeneity, with an extreme ratio of foam resistance) more than 4-8 minutes. 35 of the ingredients, the concrete has a property. The selected composition is close to the values obtained by the ingredients, which ensures intensive use of the known composition, air entrapment and initial stability of the surfactant films during the course of the invention.

the process of porisation (3-5 min) due to the sequential action of sodium and TEA alkyl sulfates and the further stability of the porous mixture (40- 60 min) due to adsorption of the SA molecules on the surface of the films.

Liquid glass is used to neutralize the passivating effect of the surfactant on the cementing properties of cement and

dispersed sulfate and triethanolamine alkyl sulfate

50 and additionally monoethanolamide in the following ratio of components,

lime mixes.

The composition (foaming agent) is prepared by mixing the indicated ingredients in the sequence: sodium and TEA alkyl sulfates, SA, liquid glass. Product concentration of frother in aqueous solution is 40-50%.

55

wt.%:

Natrialkyl sulfate20-70

Trizanolamine alkyl sulfate15-45 Monoethanolamide 5-10

Liquid glass

When comparing the properties of the proposed frother with the prototype, the foam mass was prepared in an effective one-step process - by aeration in a turbulent mixer. Water, ground sand, cement, lime were successively dosed into the mixer and mixed for 45–60 s, then a frother was introduced and the mixture was mixed for 150–180 s. The porous mixture was poured into molds, kept up to a strength of 0.3 MPa, after which it was autoclaved under an overpressure of steam 1, OMPa.

The average density of concrete and the compressive strength according to GOST were determined, the uniformity of concrete was evaluated by the distribution of CaO + + MgO in its volume, the coefficient of structural quality was calculated as the ratio of compressive strength to the square of the density of concrete.

The table presents the characteristics of the materials obtained.

From the data in the table it can be seen that the proposed formulations, the ingredients of which are within the proposed limits, as compared with the limiting ratios, provide close to the values obtained using the known composition

Claims (1)

Claim 40 A composition for the porisation of a dispersed mixture, comprising an alkyl sulfate-containing component and liquid glass, characterized in that, with the aim of reducing the density and increasing the homogeneity coefficient of the mixture, it contains sodium alkyl as the alkyl sulfate-containing component wt.%: Sodium alkyl sulfate Trizanthanolamine sulfate Monoethanolamide Liquid glass about composition 52 0.3 Notes. The ratios are given for 100% of the concentration of ingredients Editor V. Kovtun Compiled by V. Taranova Tehred L.Oleynik Proofreader A. Ilyin Order 1276/28 Mintage 588 VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 640 0.85 3.15 , 7.7 Subscription