Aerated concrete / aerated concrete Info - all dimensions and prices
- What is an aerated concrete block "> Advantages of aerated concrete block
- thermal insulation
- Fire protection
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- Disadvantages of aerated concrete blocks
- Dimensions and prices for aerated concrete blocks
- Aerated concrete - fluid concrete combinations
Aerated concrete is the material that combines the most technical properties required of a building material. Aerated concrete provides sufficient pressure resistance for exterior walls, excellent fire protection and has already integrated a sustainable thermal insulation. External walls made of aerated concrete no longer need to be insulated against heat loss. The aerated concrete has to reduce its space requirements, sound insulation and, above all, weather protection.
What is an aerated concrete block?
Aerated concrete, also called aerated concrete, as its name suggests, is a building material made from a highly foamed material. It is made by adding aluminum shavings to a cement-lime slurry. They react with the setting cement and release hydrogen. This hydrogen in turn causes the formation of bubbles and pores, for which the aerated concrete is known. After the reaction with the hydrogen, a dough-proof mass is formed. Only in an autoclave, in which the mass is treated with 200 ° C warm water vapor, the mass cures to the cellular concrete.
Advantages of aerated concrete block
The aerated concrete has the following advantages:
- excellent insulation
- excellent fire protection
- very precise dimensional accuracy
- easy to manufacture and to process
- easy to transport
- very suitable for laymans.
thermal insulation
The thermal insulation of exterior walls is hardly meaningful to increase by aerated concrete. The many bubbles produce the excellent insulation effect which can only be achieved with KSV, concrete or solid bricks with a complex and expensive additional insulation layer. Gas concrete blocks are not only easier and faster to process. As an inorganic material, they are also very insensitive to mold growth. Also the weather protection tolerates the aerated concrete reasonably well. Although moistened aerated concrete forms a thermal bridge, which can cause building damage inside the building. However, the aerated concrete does not rupture but retains its full functionality after drying. This is especially true as long as no frost has frozen the sucked water to ice. But even spalling due to ice formation in aerated concrete can usually be easily repaired. Nevertheless, aerated concrete must always be well protected against the effects of the weather
Fire protection
In terms of fire protection, aerated concrete is one of the best materials available. You can apply a wall of only 17.5 cm thick with more than 1500 ° C, on the other side of the wall only 50 ° C, and if necessary for hours.
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Aerated concrete is processed cold. The shaping is done by thin wires. The degassed premix is cut into the desired stone formats before steaming. There is almost no waste. The finished hardened stone can easily be adjusted by sawing. Simple hand saws are well suited for this purpose. However, the saw blade of a hand-held hacksaw quickly becomes dull by working on cellular concrete. Special gas concrete hand saws remain permanently usable. Particularly precise results are obtained by the use of a band saw. Due to the development of dust, the use of circular saws or cut-off wheels for the treatment of aerated concrete is discouraged. The material is so soft that slots and recesses can be made very quickly with a hammer and chisel.
Aerated concrete has a very low volume density. Packed watertight, an aerated concrete block can float. This makes it very popular in handling, since even large stones can be well moved and set by only moderately strong people.
Aerated concrete blocks are not walled up in a thick bed, but glued in a thin bed . The craftsmanship of being able to set a straight layer of bricks is not necessary when working with aerated concrete bricks. The glue is simply applied with a toothed spatula, the gas concrete blocks placed vertically and horizontally on impact - done. Even laymen can quickly acquire the walls with aerated concrete blocks and get good results.
The prerequisite for a straight, built in the adhesive wall is an absolutely straight first layer. The thin-bed mortar adhesive can no longer produce any height compensation. Therefore, the straightness of the first layer is particularly important when working with cellular concrete blocks. For this purpose, limestone or porous concrete limestone is recommended. They have been specially developed for this purpose and deliver excellent results. In addition, the tailor-made chimneys have an effective thermal protection, so that with their help at the base of a gas concrete wall no thermal bridge can arise.
Disadvantages of aerated concrete blocks
The aerated concrete block has considerable disadvantages
- reduced sound insulation
- high sensitivity to moisture
- low pressure resistance
- high space requirement
A good sound insulation can only be achieved by a dense solid material. Due to its light, open-pore structure, aerated concrete does not have the same sound-insulating effect as solid concrete, KSV or clay tiles.
The open-pore structure of the aerated concrete makes it very absorbent against all liquids. The compressive strength of aerated concrete is additionally reduced by penetrating water. Special attention must therefore be given to the sustainable protection against moisture ingress when working with cellular concrete.
Aerated concrete is very sensitive. You can already leave thumb marks in the material by vigorous grabbing. The low compressive strength makes it necessary to carry carrying outer walls of cellular concrete very wide. This affects the usable area in the interior of the house.
Dimensions and prices for aerated concrete blocks
The price for aerated concrete blocks depends on its thermal conductivity . The lower this is, the more expensive is the stone but the better is the insulating capacity. The values vary between 0.06 W / mK and 0.21 W / mK
Conversely, as the thermal conductivity increases, so does the bulk density, compressive strength and even sound insulation, but only in a theoretical range.
However, the use of aluminum powder has a price-driving effect in the production of aerated concrete blocks. The more of it is added, the higher the pore . This in turn is responsible for the thermal insulation properties.
The width of the stone is always equal to the width of the wall, which can be created with this stone.
The prices are different. In the hardware stores you will find the price information either in "per piece" or in "square meters". In the building materials trade, however, one also sees figures in euros per cubic meter when taking pallets.
| width | Prices / piece |
| 50 mm | 1.10 € to 1.30 € |
| 75 mm | 1.25 € to 1.90 € |
| 100 mm | 1.60 € to 2.20 € |
| 115 mm | 1.80 € to 2.90 € |
| 150 mm | € 2.40 to € 3.50 |
| 175 mm | 2, 75 € to 3, 95 € |
| 200 mm | 3, 20 € to 4, 40 € |
| 240 mm | 3, 60 € to 4, 95 € |
| 300 mm | 4.50 € to 5.90 € |
| 365 mm | 5.50 € to 7.10 € |
Conclusion: The price differences arise on the one hand by different purchase quantities and on the other hand by online trading vs.. Hardware store. I recommend shopping at a smaller amount in the regional trade, because the online prices are still the cost of delivery to come. For a really large amount, buying on the Internet is a great alternative and actually saves you money.
Aerated concrete - fluid concrete combinations
Particularly interesting are the combination stones, which allow the inclusion of fluid concrete. The combination of fluid concrete and aerated concrete brick results in a material mix that possesses the highest static as well as sound and heat insulating properties. The manufacturers offer shuttering stones and U-stone shells.
The shuttering stone is a hollow stone with a circular opening at the top. It is big enough to accommodate a vertical reinforcement. Through this opening, the stone is filled with concrete. In combination with the reinforcement, the formwork blocks can be used to produce excellent corner joints, which make very stable buildings, especially in areas endangered by earthquakes.
The U-shell is used to make ring anchors. They are wall-to-wall, stacked, reinforced and filled with concrete. They thus generate the necessary transverse and longitudinal stability of a house. U-cups are stated in the price per meter.
