Reliable, warm and environmentally friendly home – the dream of every person. However, traditional building materials such as brick, stone or wood are not available to everyone now. How to fulfill a dream and save money? Today there are many alternative options. Quickly build the desired house will help wall aerated concrete blocks: dimensions and prices for a piece, important parameters and expert reviews will be useful for the correct selection and purchase of this material.
What is aerated concrete
In an effort to simplify the process of building buildings and make building materials more affordable, manufacturers offer new solutions. One of them is the creation of cellular concrete. Aerated concrete is one of the varieties of porous concrete, in fact, it is an artificial stone with spherical cells.
It is made of cement, quartz sand and special blowing agents (aluminum paste or suspension). Sometimes additionally added gypsum, ash, lime. Then the mass is subjected to prolonged heat treatment under high pressure in autoclaves. Due to a chemical reaction, the cement slurry foams and solidifies with the already formed pores.
When choosing aerated concrete blocks (sizes and prices for a piece will be discussed below), it is necessary to consider the following criteria:
- total load on the walls;
- thermal performance;
- masonry proportionality;
- ways to simplify the construction process;
- the dimensions of the gas block, depending on the design dimensions of the building;
If you decide to use an aerated concrete block in construction, you must have an idea of its basic technical characteristics. This will help make the best choice and avoid irrational financial investments.
Main dimensions. Blocks of aerated concrete have different sizes, it allows you to more accurately calculate the desired amount. The most popular are: 600X300x200, 600X300X250, 400X300X200, 600X300X300, 400X300X300, 600X400X300, 400X400X300 and 500X400X300 mm. Knowing the dimensions, it is possible to calculate how many pieces of gas blocks in a cube and, accordingly, how many are needed to construct a building with given technical parameters.
Density. Brand density is measured in kg / m ?. In accordance with the requirements of GOST 25485-89 (cellular concrete), aerated concrete is subdivided according to density into heat insulating (D300-D500), structural heat insulating (D500 – D900) and constructional (D1000 – B1200). The greater the density of the aerated concrete block, the higher its carrying capacity.
Strength class This indicator determines which axial pressure can withstand this block. For example, the strength class B2.5 allows the use of such a unit in the construction of load-bearing walls with a height of up to 20 m. The values of the indicators are as follows: В1.5, В2.0, В2.5 and В3.5.
Comparative table of characteristics of gas-block and other materials:
|Specifications||Brick wall||Wall of porous large-sized ceramic blocks||Aerated concrete wall from blocks of industrial production|
|Ceramic brick||Silicate brick|
|Compressive strength, kg / m?||125||150||128||15-30|
|Average density, kg / m?||1350||1750||830||400|
|Heat conductivity, W / (m * ° K)||0.40||0.95||0.21||0.1|
|Frost resistance, cycles||35||35||50||25|
|Standard wall thickness, m||0.52||0.52||0.38||0.40|
|The speed of construction of the wall of the standard thickness, hour / m?||>3||>3||?1,3||?0.88|
Coefficient of thermal conductivity. This indicator has the following values: 0.096, 0.12, 0.14 and 0.17, and means the ability of a warmer room to “share” its heat with the cold one. The higher the coefficient, the greater the heat transfer. When determining the most suitable ratio for you, it is necessary to take into account the humidity.
Frost resistance. The frost resistance index is measured in cycles, and for aerated concrete blocks it ranges from 25 to 100. For comparison, a brick has up to 50 frost resistance cycles.
Shrinkage during drying. This indicator is measured in mm / m and should be no more than 0.5, otherwise you risk seeing more shrinkage cracks on the walls of your house than provided by state standards.
Helpful advice! For uniform drying in order to avoid shrinkage cracks, experts recommend moistening the aerated concrete structures constructed so that drying occurs evenly.
Let’s see what makes aerated concrete blocks so popular and popular in the construction industry, and what doubts arise when using them?
Technical characteristics, dimensions and prices of foam blocks. Advantages and disadvantages of the construction of foam concrete blocks. Sizes and prices of foam blocks. Applications. The choice of foam blocks: specifications.
Advantages of aerated concrete blocks:
- Aerated concrete blocks are easy to process: they are easy to cut, drill a hole in them, hammer in a nail, cut the required shape;
- they are lightweight with impressive dimensions. This greatly increases the speed of work and reduces labor costs in construction;
- it is an environmentally safe material that is made from natural ingredients that do not emit harmful substances;
- aerocrete have a high level of heat saving. Due to porosity, aerated concrete blocks hardly conduct heat This reduces the cost of heating the house in the winter and in the summer protects it from overheating;
- sound insulation properties provide cells with air. External noise will remain outside the walls of your home. Especially well they absorb low-frequency noise;
- aerated concrete does not burn – it is a fire resistant material that can withstand direct exposure to open fire for a long time. Refractoriness gives it a mineral composition;
- gas silicate concrete is frost resistant. The degree of frost resistance depends on the technical characteristics of individual blocks.
Speaking about the pros and cons of aerated concrete blocks, it is worth mentioning their shortcomings, which should be considered when choosing this material for construction:
- the higher the density of aerated concrete, the lower its thermal insulation properties;
- gas-concrete blocks with a density below 500 kg / m? can be used more as a thermal insulation material. But the density indicator of 500 kg / m? has a boundary definition. The ability to use building blocks with such density in supporting structures are determined by manufacturers and test results;
- Aerated material is not elastic. In this regard, during the deformation of the foundation, a wall of gas blocks may cause cracks. Therefore, porous concrete structures are recommended to be erected on a monolithic strip foundation, which may lead to an increase in the cost of construction;
- due to the porosity of the material for fixing massive structures on the walls of gas-concrete structures, conventional fasteners will not work. It is necessary to acquire special ones – for porous fragile structures, which may also entail additional costs;
- when laying porous blocks use cement-sand or a special adhesive solution. In the first embodiment, the heat loss increases by 25%, in the second – by 10%. In addition, thermal resistance also falls due to the use of jumpers and reinforced belts. Thus, some experts believe that manufacturers of aerated concrete products have exaggerated claims about the high heat saving of this material, since through the styling seams there are heat losses that are not taken into account in the technical characteristics;
- Aerated concrete absorbs moisture, so in the construction of such a material it is necessary to make a vapor barrier. Anti-vapor effect is achieved by using a deep penetration primer and plastering work;
Helpful advice! For the construction of a house with carrying capacity and good thermal insulation, it is necessary to choose aerated concrete blocks with a density of 500 kg / m ?, take care of a solid foundation and a vapor barrier, and use special thin-layer glue for laying.
Both materials are manufactured according to the same State Standards and have similar physical and technical properties. Foam concrete also has a porous structure, it is made from cement-sand mixture with the addition of a foaming agent. The difference with aerated concrete is that foam concrete hardens naturally, and aerated concrete – with the help of heat treatment. Also for these materials various foaming agents are used.
Determining what is better: gas blocks or foam blocks, you need to know that the technology of manufacturing foam blocks is simple and does not require factory conditions. Therefore, they can be made on portable equipment directly on the construction site. Such accessibility is not always on hand to consumers: unfair manufacturers often engage in the manufacture of foam blocks, which significantly affects the quality of products.
Gas blocks are made in large enterprises that adhere to the required regulatory indicators.
It is important! When buying foam concrete blocks from small manufacturers, take the trouble to check the necessary permits and quality certificates.
A block of foam concrete may have toxic properties, since the curing process occurs naturally and chemical processes may not be completed completely. Processing the same gas blocks in autoclaves ensures the completeness of the chemical process and the environmental safety of the product.
Different production methods also affect the mechanical strength of the building materials being compared. At the same density, aerated concrete is stronger than foam concrete. For example, at a density of 500 kg / m? aerated concrete can be used as a supporting structure, and the foam concrete with this indicator can only be used as a heater.
Moisture absorption and frost resistance also destroys these building materials. Gas blocks absorb more moisture, which affects heat transfer and frost resistance. However, this problem is solved with the help of plastering.
In addition, the dimensions of foam blocks are not always standard. Foam concrete crumbles, so the processing is not as malleable as aerated concrete and can crumble in the process.
A significant advantage of foam blocks in the price. 1m? blocks of foam will be cheaper by 400-800 rubles, rather than from aerated concrete. The price is influenced by the cost of production, production equipment, components and applied technologies.
Thus, it is unequivocal to say that it is better for building a house: aerated concrete or foam concrete is impossible. The choice of a building material depends on the purpose of its use, the quality of materials and compliance with technological processes in its manufacture.
In order not to acquire an excess amount of building materials, an approximate calculation of the required number of gas blocks can be made. To do this, you can use the following formula:
(LхН-Sпр) х1.05хВ = V, Where
L is the total length of aerated concrete walls, m;
H – the average height of aerated concrete walls, m;
Spr – the total area of window and door openings, m ?;
1.05 – coefficient taking into account the margin of 5% for trimming;
B – thickness of blocks, m;
V – the volume of the required amount of aerated concrete, m ?.
Based on the formula, you can create the following table for calculating the number of gas blocks in a cube:
|Sizes of gas blocks, mm||Pieces in a cube|
Such a calculation is approximate and is rather a recommendation. On the websites of manufacturers and sellers of aerated concrete blocks, you can find online calculators for the necessary calculations. You can also immediately calculate the cost of construction, taking into account the size of the gas blocks and price per piece.
A lot of companies producing building materials are engaged in the production of gas blocks. The demand for aerated concrete blocks of such domestic manufacturers as IVF (Yaroslavl), GRAS (Maloyaroslavets), BONOLIT (Old Kupavna), Thermocube (Kostroma), DRAUBER (Elektrostal), YTONG (Mozhaysk), El-BLOCK (Kolomna), PORITEP (Novomichurinsk ), AeroStone (Dmitrov), LZID (Lipetsk), Silabit (Old Kupavna). These companies have the necessary technological equipment and specially trained personnel. Their product is certified and of good quality.
The price depends on the density of aerated concrete, thermal conductivity coefficient, frost resistance index and other technical characteristics. With the same density and dimensions of gas blocks, the prices of domestic companies for products with the same technical characteristics are not too different. For example, the cost of a cubic meter of aerated concrete blocks from the manufacturer DRAUBER is 2500 rubles / m ?, Silabit – 2600 rubles / m ?, IVF – 2650 rubles / m ?. Thus, at a density of 500 kg / m ?, the average price per piece of a gas-block 20X30X60 cm will be 92 rubles.
Making a purchase, it is necessary to inquire about documents confirming the quality of the goods. It will also be useful to check the products for external damage (this may affect the properties of the gas blocks during operation). An overview of the types, technical characteristics, properties, sizes and prices for a piece of aerated concrete blocks will surely help you make the right choice and soon enjoy your own cozy and inexpensive housing.