RU2177926C1 - Method of manufacturing arbolite - Google Patents

Abstract

FIELD: building materials industry, more particularly manufacture of heat-insulating materials. SUBSTANCE: method comprises preparing industrial foam, adding lime additive thereto in amount of 5- 10% of weight of aqueous solution of foaming agent and calcium chloride additive in amount of 1.5-2% of weight of cement and subsequently mixed dry mixture of cement and wood filling agent. EFFECT: greater resistance of foam and improved adhesion of cement stone and wood filling agent. 1 tbl

Description

 The invention relates to the construction materials industry, in particular the production of heat-insulating materials.

A known method of producing arbolite (SU 1740348 A1, class C 04 B 18/24, 06/15/1992), including the preparation of a raw mixture consisting of a binder, wood aggregate, water and CaCl ₂ additives, the preparation of a foam consisting of water and a foaming agent followed by the introduction of foam into the raw material mixture, mixing, compaction and hardening.

 However, in the known production method when using a pore-forming additive, in order to improve the heat-insulating properties and facilitate the design, a decrease in the strength of the material due to the appearance of air pores inside the material is observed, and the bulk density also increases.

 The closest in technical essence and the achieved result to the claimed is a method of producing arbolite (Production and use of arbolite. / Ed. S. Hasdan - M.: Forestry, 1981, pp. 53-64), including the preparation of technical foam from an aqueous solution of a foaming agent and a raw mixture of cement and wood aggregate, the introduction of calcium chloride additives, mixing and hardening.

 The invention solves the problem of obtaining arbolite based on the use of lime as an additive that increases the stability of the foam, and the production of arbolite by dry mineralization.

 The problem is solved due to the fact that in the known method of producing arbolite, which includes the preparation of technical foam from an aqueous solution of a foaming agent and a raw mixture of cement and wood aggregate, the introduction of calcium chloride additives, mixing and hardening, lime quantity is added to the prepared technical foam in an amount 5-10% by weight of a foaming agent solution and the addition of calcium chloride in an amount of 1.5-2% by weight of cement, followed by the introduction of a pre-mixed dry cement mixture and d evesnogo aggregate.

 The addition of lime in an amount of 5-10% of the foaming agent solution significantly increases the resistance of the foam and improves the adhesion of the cement stone to the wood aggregate.

 Adding lime in a smaller amount does not give the indicated effect, and in a larger than 10% it does not significantly improve the achieved results.

 Mixing the raw material mixture with the foam is significantly different from the known method. In the prepared foam, which consists of water, a foaming agent, lime and calcium chloride, a dry raw mixture is gradually added, and the addition of dry components should be uniform. With this method of mixing, a stable mineralized foam is formed due to the adhesion of solid mineral particles to the bubbles of the foam. Mineralized bubbles gradually come together and form a continuous cellular-mineralized foam, in which each air cell is armored with a large number of solid particles. The rate of adhesion of solid particles to the bubbles of the foam is due to the forces of interaction between the surface of the solid phase and the polar groups of the surfactant.

 This method allows the use of non-ground aggregates and a small amount of foaming agent.

 The following describes the preparation of arbolite based on cement M400, crushers, calcium chloride additives, lime, water and a foaming agent.

The composition of arbolit per 1 m ³ :
Cement - 310 kg
Crusher - 140 kg
Lime - 19 kg (10% of the mass of the foaming agent solution)
CaCl ₂ - 6 kg (1.9% by weight of cement)
Foaming agent solution - 190 l
A dry raw mix is prepared by mixing cement and crushed. Then, foam is whipped from the prepared foaming solution using a stirrer. In this case, lime and calcium chloride are added. 3 minutes after the start of beating, the dry raw mix is gradually poured through the funnel without stopping the mixer. The resulting homogeneous mixture is placed in pre-cooked and machine-oiled forms. Sealing is done by shaking the molds. The form has a size of 10x10x10 cm. Hardening occurs within 7 days.

 To identify the optimal composition of arbolite, several batches of various compositions are prepared according to the indicated procedure. Test samples for compression.

 The test results of samples manufactured by the proposed method are shown in the table.

In rows 1, 2 of the table, the content of lime is 6.2% by weight of the foaming agent solution, in row 3 - 9.1% of the mass of the foaming agent solution; in lines 1, 2, the content of CaCl ₂ is 1.77% by weight of the cement; in line 3, the content of CaCl ₂ is 1.9% by weight of the cement.

 The method can be carried out using known equipment.

Claims (1)

 A method of producing arbolite, including the preparation of technical foam from an aqueous solution of a foaming agent and a raw mixture of cement and wood aggregate, the introduction of calcium chloride additives, mixing followed by hardening, characterized in that 5-10% by weight of lime is added to the prepared technical foam an aqueous solution of a foaming agent and the addition of calcium chloride in an amount of 1.5-2% by weight of cement, and then a mixed dry mixture of cement and wood aggregate.

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