Raw mix for preparation of frost-resistant wall building stones and monolithic walls

FIELD: construction.

SUBSTANCE: raw mix for preparation of frost resistant wall building stones and monolithic walls, including a binder, a filler - an ash and slag mixture, a foaming agent, a chemical additive - Relamix. Type 2, calcium carbide, the binder used is represented by the following components jointly ground to the size of less than 250 m2/kg: an ash and slag mix from burning of coal in furnaces of a boiler house or a thermal power plant cooled by dry method, a hardening activator - alkaline reagents of sodium or potassium, or carbonates of these metals or lime or mixtures of the specified reagents, and calcium sulfate dihydrate, and the filler is an ash and slag mixture from burning of coal in furnaces of a boiler house or a thermal power plant, cooled by the dry method, and clay, and additionally the mixture contains spent engine oil, at the following ratio of components, wt %: specified ash and slag mixture for a binder 14-19, specified activator of hardening 3-6, specified calcium sulfate dihydrate 4-6, foaming agent 0.3-0.6, Relamix. Type 2 0.1-0.2, calcium carbide 0.5-4.0, clay 5-10, spent engine oil 0.2-0.4, specified ash and slag filler - balance.

EFFECT: improved frost resistance of products from the proposed mix.

1 ex, 1 tbl

 

The invention relates to construction materials, namely, compositions of mixtures for the manufacture of cold-resistant masonry and monolithic walls.

Known for lightweight concrete mixture [1], including Portland cement, porous filler - fired porous sand from siliceous marl, natural quartz sand. The disadvantage of this mixture is low frost products of the above-mentioned mixture. For example, frost wall building stones (cinder block) 67 cycles.

Closest to the proposed construction is a mixture of [2] for the preparation of lightweight concrete. The specified construction mixture contains, wt%:

The slag Portland cement- 25-35
Ash mixture- 60-80
Calcium carbide- 0,5-8,0
The foaming agent- 0,78
Chemical additive "Reemix. Type 2"of 0.1 - 0.2.

The disadvantage of this construction mixes low frost 80 cycles.

The problem solved by the invention is to improve the frost resistance of the products of the proposed mixture.

Technical is the second result, obtained by carrying out the invention consists in the optimization of material composition, the ratio of components of the concrete, the concrete composition of the clay.

To achieve provide the technical invention of the raw mixture for the preparation of frost wall building stones and solid walls, including binder, filler - ash mixture, foaming, chemical additive - Reemix. Type 2, the calcium carbide, the binder together crushed to a particle size of less than 250 m2/kg ash mixture from the combustion of coal in boiler furnaces or power plants cooled by the dry method, the activator curing - alkaline reagents sodium or potassium hydroxide, or carbonates of these metals, or lime, or a mixture of these reagents, and dowolny plaster, and as a filler it contains ash and slag mixture from the combustion of coal in boiler furnaces or power plants cooled by a dry process, and clay, and optionally, the mixture contains the waste engine oil, in the following ratio, wt.%:

Specified ash mixture for knitting14-19
The specified activator curing3-6
Specified gypsum dowolny4-6
The foaming agent0,3-0,6
Relamix. Type 20,1-0,2
Calcium carbide0,5-4,0
Clay5-10
Waste engine oil0,2-0,4
Specified saleslady fillerrest

The essence of the invention consists in the following. As a binder used ash mixture from the combustion of coal in boiler furnaces or power plants cooled by the dry method, the activator curing - alkaline reagents sodium (NaOH) or potassium hydroxide (KOH), or the carbonates of these metals (Na2CO3, K2CO3) or lime (CaO) or a mixture of these reagents, and dowolny gypsum. These three components must be subjected to a joint grinding to a particle size of less than 250 m2/kg.

Known ash binder based on a mixture of three components:

ash mixture from the combustion of coal in boiler houses and CHP plants, chilled dry method, the activator is sodium hydroxide (NaOH) or potassium hydroxide (KOH), sodium carbonate (Na2CO 3) or potassium (K2CO3), acid sodium carbonate or potassium, and dowolny gypsum, astringent received joint grinding of these components to a particle size of 700 m2/kg [3].

As filler concrete encouraged to apply ash mixture from the combustion of coal in boiler furnaces or power plants, it is necessary to cool the ash and slag mixture dry method.

These materials are waste, have low cost, which significantly reduces the price of products. Ash-slag mixture has a low specific gravity that provides a low thermal conductivity of concrete products. At the same time use a mixture solves the environmental problem and reduces the cost of production.

The use of waste engine oil solves the environmental problem and at the same time in the present invention solves the problem of foam formation in the manufacture of our products, reduced density products and, accordingly, decreases thermal conductivity.

Ash mixture from the combustion of coal, has a high porosity, which reduces thermal conductivity of the products, this reduces the internal stresses in the body of concrete products, reducing the number of cracks at low temperatures and, accordingly, increases the frost resistance of concrete. Porous materials enhance m is RosettaNet. The application of calcium carbide in concrete is accompanied by decomposition into calcium oxide and acetylene C2H4. Acetylene in the form of small bubbles retained in the body of the concrete and loosens it reduces the density of the concrete, resulting in increased frost resistance.

Calcium carbide (CaC2in the solution reacts with water with the formation of acetylene gas With2H4, of calcium oxide CaO, calcium hydroxide CA(OH)2. Oxide and calcium hydroxide in the solution react with the compound of silicon (SiO2), aluminum (Al2O3), iron with the formation of silicates, aluminates, ferrato calcium, with the formation of binding minerals Alita 3CaOSiO2, Belita 2CaOSiO, alumosilicate minerals CaOAl2O3H2O, 2CaOAl2O3H2O, CaOAl2O3SiO2, ferrato calcium CaOFe2O3H2O.

All these minerals possess astringent properties. The formation of these minerals during hydration increases in most cases the strength of the concrete.

Clay is a natural fine-grained material, when wetted with water, the clay becomes plastic and consists mainly of SiO2, Al2O3and water, which are mainly in the composition of the silicates. The clay is free kremachoclet in the form of quartz and opal. The iron contained in the clay in the oxide form. Su the clay contain soluble salts include chlorides, sulfates, carbonates of alkali and alkaline earth metals, aluminum and iron. When the hydration of the concrete, these substances enter into reaction with the main binder mineral cements with alicom 3CaOSiO2and, thus, increase the strength of concrete, increase the rate of hardening of concrete and, consequently, increases the frost resistance of concrete products.

Clay is not aggressive material does not contain toxic and radioactive elements, is widely distributed in nature, of all building materials has minimum cost. Russia since ancient times uses clay for the manufacture of household earthen ovens to metallurgical units. Central Asia is building a mud house with a long service life.

The hydroxides and carbonates of alkali metals are highly reactive, interact with silicates, aluminates and ferrate with the formation of binding materials.

Example. To study applied the ash-slag mixture CHP Kuznetsk metallurgical combine, cooled by the dry method.

Clay from a quarry in the vicinity of core (clay use only the residents of the city for repairs). The clay was dried at 115C and was crushed in a laboratory mortar.

Mixture was prepared according to the invention.

Ash mixture, the solid activator is con - lye (NaOH) and dowolny the plaster joint subjected to grinding to a particle size of less than 250 m2/kg.

Filler - ash mixture from the combustion of coal in boiler furnaces or power plants cooled by a dry process, crushed to a particle size of less than 250 m2/kg, clay, chemical additive "Reemix. Type 2", the foaming agent-2. The mixture was mixed with a plastic spatula. Next, the prepared mixture: water, water, waste engine oil. Mixed aqueous solution with a dry mixture and added calcium carbide. After 20 minutes from the resulting concrete solution made cubes of size 7*7*7 see

The chemical composition of the ash-slag mixture is presented in the table. The chemical composition of the clay is not defined.

Chemical additive "Reemix. Type 2 is used to increase the plasticity of concrete. Comes in the form of a white powder in paper sacks. Technical conditions TU 5870-002-14153664-04 with am.1. The manufacturer LLC "Polyplast URALSIB 623109, ppersonals, Sverdlovsk oblast, St. factory, 3.

As the foaming agent used soap powder.

The results of the experiments are shown in the table. Hardening of the samples was performed at room temperature 21-25C. Heating of the concrete is not recommended. The results of the experiments are shown in the table, from which it follows that the proposed method can obtain high-quality bet is n with high frost resistance using non-deficient, cheap raw materials. It does not require heating of the concrete.

Make building stones and solid walls it is recommended that vibration method.

Based on the studied properties of a number of the described substances designed declared raw mixture for the preparation of frost wall building stones and solid walls.

Sources of information

1. RF patent 2259331, IPC 8 C04B 28/04, 2004.

2. RF patent 2362755 Cl, IPC C04B 38/02 (2006.01), C04B 38/10.

3. RF patent 2405745 Cl, IPC C04B 7/153 (2006.01), 2010.

Raw mixture for the preparation of frost wall building stones and solid walls, including binder, filler - ash mixture, foaming, chemical additive - Reemix. Type 2, calcium carbide, characterized in that the binder together crushed to a particle size of less than 250 m2/kg ash mixture from the combustion of coal in boiler furnaces or power plants cooled by the dry method, the activator curing - alkaline reagents sodium or potassium hydroxide, or carbonates of these metals, or lime, or a mixture of these reagents and dowolny plaster, and as a filler it contains ash and slag mixture from the combustion of coal in boiler furnaces or power plants cooled by a dry process, and clay, and optionally, the mixture contains waste oil etc the following ratio of components, wt.%:

specified ash mixture for knitting14-19
the specified activator curing3-6
specified gypsum dowolny4-6
the foaming agent0,3-0,6
Relamix. Type 20,1-0,2
calcium carbide0,5-4,0
clay5-10
waste engine oil0,2-0,4
specified saleslady fillerrest



 

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