RU2128154C1 - Method of production of foam concrete - Google Patents

Abstract

FIELD: construction; erection and insulation of guards of structures. SUBSTANCE: dry mix consisting of binder and filler is subjected to activation for 120 to 600 seconds, after which solution of additives is introduced and is subjected to mixing which continues for 30 to 120 seconds; then foam is fed and mixing is continued for 20 to 60 seconds. Amorphous silica in amount of 25 to 60 percent is used as filler. Method provides for production of homogeneous porous structure of foam concrete and enhanced bonding strength of particles of binder and filler and consequently resistance to lamination of foam concrete components. EFFECT: enhanced strength of foam concrete at high porosity due to enhanced strength of bonding of binder and filler. 1 tbl

Description

 The invention relates to the production of foam concrete products used in construction for the construction and thermal insulation of building envelopes.

A known method of manufacturing foam concrete products by preparing the foam, mixing an aqueous solution of a surfactant, introducing into it the dry components of the binder with stirring, molding from the obtained foam products and drying. During the preparation, the foam mass is subjected to vibration with a frequency of 700-1000 Hz and an oscillation amplitude of 0.4-0.6 mm, and with the introduction of a binder, the vibration frequency is changed to 300-600 Hz with an oscillation amplitude of 0.7-0.9 mm. The material obtained in a known manner has a compressive strength of 0.64-0.88 MPa, with an average density of 170-230 kg / m ³ , the coefficient of thermal conductivity of 0.034-0.038 W / m • K, water absorption of 45-50%.

 The disadvantage of this method is its complexity and the complexity of the hardware design.

Closest to the proposed technical solution is a method for producing foam concrete, including preliminary mixing of cement, gypsum or anhydride with lime powder, plasticizer and water, preparing foam in a special device, mixing the resulting foam with other components in a batch concrete mixer. The volumetric mass of hardened foam is 400 kg / m ³ .

 The disadvantage of this method is the heterogeneity of the porous structure of concrete due to its delamination and in the manufacturing process and, accordingly, low quality indicators.

 The technical result of the proposed invention is to increase the uniformity of the porous structure (by reducing the delamination of the foam) and the quality of the products.

 This result is achieved in that, in comparison with the prototype, the dry mixture of binder and filler is subjected to mechanical activation for 120-600 s, then a solution of additives is added and mixed for 30-120 s, after which foam is fed and mixed for 20-60 with. In this case, amorphous silica in an amount of 25-60% is used as a filler.

 The use of such techniques ensures a homogeneous porous structure of the foam concrete and allows to increase the adhesion strength of the binder and filler particles and thereby resistance to delamination of the foam concrete components. Increasing the strength of the binder and filler contacts will provide an increase in strength with high porosity of foam concrete.

 Foam concrete was made as follows.

 Technical foam was preliminarily prepared by machining in an foam generator an aqueous solution of a foaming agent. The detergent Progress, triethanolamine salts (TELS), Potok and Cascade were used as the foaming agent.

 A binder (cement, lime, and other similar materials) and a filler (amorphous silica) were loaded into the mixer and processed for 120-600 s, then an aqueous solution of additives was poured into the dry mixture and mixed for 30-120 s, after which it was fed foam and mixed for 20-60 s.

 The foam concrete thus prepared was supplied to the molding unit.

 Specific examples of the manufacture of foam concrete are presented in the table.

 Examples 1-3 were carried out according to the proposed technical solution.

Example 4 was performed with transcendental parameters of the method
Example 5 - the prototype
The table shows that only the use of the combination and the sequence of operations shown in the method allows to obtain foam concrete with a homogeneous structure and high quality.

 The proposed technical solution is industrially applicable and can be used in the production of foam concrete without any restrictions and special conditions.

 Sources of information taken into account when compiling application materials.

 1. Copyright certificate N1392061, BI 1988, N 16.

"Method for the manufacture of thermal insulation products"
2. Application of France N2593497, published. 07/31/1987

 "Method, composition and device for producing foam concrete."

Claims (1)

 A method of producing foam concrete, including the preparation of foam, mixing it with a mixture of binder, filler and solution, characterized in that the mixture is prepared by mechanochemical activation of the binder and filler for 120 - 600 s, followed by mixing for 30 - 120 s with a solution of additives, moreover, amorphous silica of a fraction of 0.01 - 1.0 mm in an amount of 25-60% is used as a filler, and the foam with the resulting mixture is mixed for 20-60 s.

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