Answers to many possible questions
The main difference between these materials lies in the technology of their production. Aerated concrete has an open-pore material structure, while foam concrete has a closed-pore structure. Blocks made of aerated concrete “breathe”, that is, they let vapors and air through, while blocks made of foam concrete do not. Having the same density, aerated concrete, thanks to a special heat treatment, can carry a much greater load than foam concrete. With the same strength, aerated concrete blocks with a density of 400 kg / m3 are approximately 40% warmer than foam concrete blocks with a density of 600-700 kg / m3.
The main difference between aerated concrete and ordinary concrete lies in its composition. Ordinary concrete is obtained on the basis of a mixture of cement, sand, crushed stone and water, and aerated concrete is an artificial, fairly durable, cement stone with pores 0.5–3 mm in diameter evenly distributed throughout the volume. Naturally, there is no crushed stone in the composition of aerated concrete.
To work with aerated concrete blocks, you will need the following tools: a notched trowel, a bucket for preparing a cement-sand mortar or glue, sandpaper for leveling the surface plane, a hand saw for sawing blocks, as well as cleaning equipment (brush, broom, etc. .).
It is allowed, but this, as a rule, is fraught with an increase in the complexity of the work and an increased consumption of masonry material. In addition, a thick mortar joint will cause the formation of cold bridges, which will lead to an increase in total heat loss through the walls by at least 10-30%. Most likely, such walls will require additional insulation.
Yes, there is. There is a special dry mixture that must be diluted with water immediately before use. By and large, this is the same ordinary masonry mortar, but with a fine-grained fraction and containing special additives. Recently, dry mixes of the “just add water” type have become very popular, since in this case, work on the construction site is not tied to the delivery of the finished mortar. You can always prepare the right amount of adhesive solution right at the workplace.
It is allowed, but subject to the use of aerated concrete blocks with a density of 600-700 kg / m3, having a width of more than 20 cm and with the obligatory arrangement of a strapping reinforcing belt. Instead of a strapping reinforcing belt, you can use brickwork in 3 rows, laid on a cement-sand mortar (ratio 1: 3) with mandatory reinforcement with a metal mesh. It is possible to lay floor slabs only after the concrete strength of the reinforcement belt reaches at least 80%
When using aerated concrete in low-rise construction, masonry reinforcement is not required. If you cannot do without reinforcement, we recommend that you choose a special fiberglass mesh or single metal reinforcing bars for this purpose, which should be laid in longitudinal strobes.
If there really is a need for additional insulation of aerated concrete walls, then it is best to do this with the help of mineral wool heaters with sufficient vapor permeability. They are able to provide the optimal mode of operation of aerated concrete walls.
It all depends on the density of aerated concrete and the seasonality of living in the house. If the house is planned to be used for seasonal living, as well as for periodic trips in the winter, then with a density of aerated concrete blocks of 350–400 kg / m3, a wall with a thickness ranging from 150 to 250 mm will be sufficient. If you are building a house for permanent residence, then its walls should have a thickness of about 300–375 mm.
In the process of manufacturing aerated concrete blocks, the raw material is cut into separate pieces (blocks), as a result of which some of the open pores of the material are on the outer surface of the blocks. When it rains, aerated concrete walls get wet, moisture penetrates only into the surface layers of aerated concrete, while not causing its destruction, but only worsening the aesthetics of the walls (dark spots). If you don’t care what the facade of your house looks like, then you can. Currently, there is a wide variety of modern facade materials for exterior decoration, which are able to provide an aerated concrete structure not only with high attractiveness and a unique aesthetic appearance, but at the same time retain one of the main advantages of aerated concrete – the ability to “breathe”.
It is allowed to store aerated concrete blocks in an open place, but subject to some simple requirements:
It is forbidden to lay blocks directly on the ground. The best solution would be to stack the blocks on special wooden pallets.
In order to avoid the ingress of a large amount of moisture and freezing, it is recommended to cover the aerated concrete blocks with plastic wrap.
Yes, aerated concrete blocks are perfectly machined. They can be easily drilled, sawed, milled, ditched, while using both electric and conventional hand tools. So, for example, with the help of a conventional hand saw, an aerated concrete block can be easily given any shape, which completely solves the problem in additional blocks, and in addition, it allows you to avoid a number of problems when solving internal household tasks. Using a conventional electric drill, you can easily make holes for sockets, wiring, pipelines, and also cut the necessary channels.
Of course, at present, aerated concrete is one of the most economical wall building materials. One block of aerated concrete is equal in volume to 7 – 8 standard bricks. At the same time, the weight of the block (16 kg) is several times less than the weight of bricks of the same volume (about 41 kg). The use of aerated concrete blocks allows you to increase the pace of construction, while the cost of aerated concrete masonry, as a rule, 2 – 3 times cheaper than brick. This allows you to get significant savings on the cost of masonry work. Along with this, the use of a special adhesive as a masonry mortar allows not only to reduce the consumption of masonry mortar (the joint thickness is only 3-5 mm), but also to reduce heating costs during the further operation of the house (use of an energy-efficient adhesive mortar; there is less heat loss in a thin joint) .
An additional reduction in the cost of construction is achieved by reducing the cost of arranging the foundation, since a house made of aerated concrete blocks is much lighter than a brick house, and as a result, the use of a cheaper lightweight foundation structure.
The use of aerated concrete blocks in the construction of a house allows you to:
– reduce the mass of walls by 4 – 10 times,
– increase the thermal resistance of walls by 7 – 26%,
– reduce construction costs by 40 to 50%,
– reduce the cost of finished aerated concrete walls by 43-56%,
– reduce the specific share of investment in construction by 15–50%,
– reduce labor costs at the construction site from 40 to 50%,
– to reduce energy costs during the subsequent operation of the house by 7 – 30%.
As you can see, the numbers speak for themselves.
Of course yes. I would like to note that autoclaved cellular concrete is not only referred to as energy-saving building materials, but in addition it occupies one of the leading positions in the building materials market. Its coefficient of thermal conductivity is comparable only with wood. All other wall materials available on the market (expanded concrete, foam concrete, wood concrete (arbolite), reinforced concrete) are largely inferior to it. For example, being in a dry state, an aerated concrete block is warmer than a silicate brick, at least 13 times. Due to the excellent thermal insulation properties of aerated concrete, it became possible to use it as external walls without the need for additional insulation.
Due to its porous structure, aerated concrete has excellent sound-absorbing ability. So, for example, aerated concrete blocks with a density of 500 with a wall thickness of 500 mm have a sound absorption equal to 66.7 dB. In other words, if a tractor or an excavator works on the street near the house, then behind such a wall in the house the noise level will be approximately the same as from a working wall clock.
Aerated concrete building materials have excellent thermal insulation properties, excellent air permeability. According to these properties, aerated concrete is almost identical to wood (in particular, pine) and is able to provide an optimal microclimate indoors.
Products made on the basis of cellular concrete are non-toxic, they are not capable of releasing toxic substances during production and operation. The Ministry of Health of the Soviet Union established an environmental factor for wall materials: for wooden walls – 1.0, for walls made of cellular concrete – 2.0, for walls made of ceramic bricks – 10.0, for walls made of expanded clay concrete blocks – 20.0, for reinforced concrete walls – 50.0.
About 80% of the volume of aerated concrete blocks is filled with air bubbles, which gives the material excellent thermal insulation properties and a relatively low specific gravity.
Houses built from aerated concrete blocks have excellent strength and durability. As confirmation of these words in the Baltic States (particularly in Riga) there are a number of houses built from aerated concrete blocks and not protected by decoration. They are over 70 years old. During this period of time, no traces of masonry peeling or delamination appeared on the outer surface of the walls, there were no chips or cracks. Houses made of aerated concrete have proven themselves in the difficult climatic conditions of St. Petersburg, where more than 15 million m2 of living space was built.
Aerated concrete walls have excellent seismic resistance. So, for example, in Angarsk and Norilsk, in conditions of increased seismic activity, a significant number of five-story residential buildings designed by LenZNIIEP were built using non-autoclaved aerated concrete. They have been successfully operated for over 40 years.
The geography of application of aerated concrete blocks, which have unique performance characteristics, allows them to be used in almost all climatic zones and on all continents. Aerated concrete is produced in such northern countries and regions as Canada and Siberia, hot North and South America, Australia, South and North Africa. In addition, aerated concrete has found application in monsoonal Southeast Asia, in the arid Arabian Desert, in seismically active regions of Japan, in California and Turkey. The geography of application of aerated concrete is extensive: many 7- and 17-storey residential buildings were built in Sweden, single-family residential buildings were erected in Yugoslavia, economical construction of houses was carried out in Cuba.
Your fears are unfounded. It will not be noisy in such an apartment. Aerated concrete is an excellent soundproofing material, which, due to its highly porous structure, perfectly “dampens” various household noises. In laboratory conditions, it has been proven that an aerated concrete wall is capable of providing sound insulation of 44 dB. According to official standards, this indicator for domestic premises should be at least 41 dB. As you can see, in a house built of aerated concrete, neighbors will not bother you.
Apparently, a large thickness of the seam is obtained as a result of non-compliance with the masonry technology. This can be easily corrected, but this requires practical advice from specialists directly at your construction site. In addition, carefully study the recommendations of the manufacturer attached to the batch of aerated concrete blocks, strict adherence to which will allow you to avoid a number of mistakes during construction.
The main feature of a house built using cellular concrete is that much less energy is required to heat this room. So, for example, in order for the same amount of energy to be spent on heating a building made of ordinary brick and a house made of cellular concrete, the thickness of the brick wall should be from 1.5 to 1.9 meters, while the wall thickness of aerated concrete should be only 40 see. That is why in houses built of brick, it is either necessary to use additional thermal insulation measures, or to spend additional energy on heating it. The use of insulation, as a rule, leads to a significant increase in the cost of the entire structure of the house, which, against the background of the relatively low price of aerated concrete, cannot be the best solution in terms of energy savings. By building a house from cellular concrete, you can reduce heating costs by an average of 20 to 40%. In addition to excellent thermal insulation characteristics, aerated concrete also has good sound insulation properties. This fact is no less important for a country house, as well as for a city apartment or cottage.
Aerated concrete has a number of unique properties that have been obtained using modern production technologies. Special autoclave treatment of aerated concrete made it possible to obtain a material with high strength (from 10 to 50 kg/cm2), low density (from 400 to 600 kg/m3), as well as low thermal conductivity (from 0.09 to 0.14 W-moS ). Such blocks do not shrink during the drying process, do not break, do not crack, they are delivered to the object immediately in finished form. Having a uniform porous structure throughout the volume of the block, it is possible to achieve excellent air exchange in the walls, similar to that in wood. In addition, aerated concrete blocks are easy to fit, trim and other kinds of machining, even with a hand tool. Aerated concrete can rightfully be called an ideal building material.
As a rule, autoclaved aerated concrete wall blocks are delivered to end users stacked on pallets and packed in a protective polyethylene film. When performing transportation, as well as during storage, you must follow a few simple rules. When transporting, it is necessary to avoid spontaneous horizontal movements, and especially collisions of pallets. For these purposes, pallets with blocks in the car body must be rigidly fixed with soft slings. Loading and unloading operations, in order to avoid various kinds of mechanical damage, must be performed only using soft slings or a special traverse. The use of metal slings is highly discouraged. Particular attention should be paid to the storage of aerated concrete blocks. Storage of pallets with aerated concrete lintels and blocks should be carried out on a flat area, protected from moisture. It is allowed to stack blocks and lintels in stacks, but not more than two tiers in height. Reinforced floor slabs must be stored on special linings made of wooden beams. For long-term storage of blocks, it is recommended to arrange a canopy made of waterproofing material with a slope for better water drainage.
All of the building materials listed above are cellular concrete.
Aerated concrete is an artificial stone having a porous structure with air pores evenly distributed throughout the volume (cells occupying approximately 90% of the entire volume of the block). Aerated concrete is obtained in the process of hardening a mixture of binders (lime, cement or mixed), a blowing agent, a silica component and water.
One of the main differences between these materials is the curing conditions and the principle of pore formation.
Currently, there are two methods of pore formation:
– due to the reaction of calcium hydroxide with aluminum powder, hydrogen is formed, which forms cellular pores (aerated concrete, gas silicate).
– as a result of the reaction of the base mixture with special foaming additives (foam concrete).
There are two ways to harden cellular concrete:
– non-autoclave method of hardening (hardening under natural conditions, or hardening in special steaming chambers at normal pressure),
– autoclave hardening method (hardening in a special autoclave oven in high pressure and saturated steam).
All foam concrete available on the market is produced exclusively by a non-autoclave method, and other types of cellular concrete are produced by both autoclave and non-autoclave hardening.
Autoclaved cellular concretes are much better than non-autoclaved concretes, primarily in such characteristics as shrinkage, strength and dimensional accuracy. It is worth noting that the physical and technical characteristics (shrinkage, strength, frost resistance) of similar products made of autoclaved cellular concrete can differ significantly depending on the manufacturer, since not only the compositions of cellular concrete solutions differ, but also their production technologies.
Yes, you can. Foam concrete blocks can be easily distinguished from aerated concrete blocks by the following features:
– by weight
Aerated concrete blocks have a much lower weight than foam concrete blocks of similar size, since the density of autoclaved aerated concrete is 400 – 600 kg / m3, non-autoclaved foam concrete – 600 – 800 kg / m3.
– by color
Foam concrete has a dark gray color, and autoclaved aerated concrete is white.
– according to the porosity of the material in the place of cutting
Foam concrete has an uneven structure that varies in height, the cells have different sizes and shapes. Autoclaved aerated concrete has a uniform (homogeneous) structure throughout its volume, cells are similar in size and shape.
– block geometry
Foam concrete blocks have deviations in overall dimensions up to 10 mm, as a rule, there is no parallelism of the sides and the correctness of the geometric shape. Blocks made from autoclaved aerated concrete have strictly parallel edges, precise geometry, and deviations in overall dimensions of no more than 1 mm.
Yes, you can, but only under certain conditions. When using aerated concrete in places of possible direct exposure to moisture, as well as in rooms with a wet operating mode, it is necessary to additionally use special waterproofing compounds. All building compositions and compositions used in this room when finishing the surface of walls made of autoclaved aerated concrete must be specially modified with water-retaining additives. The holding capacity of such compounds should be at least 98%. Currently, similar products are widely represented on the building materials market, both by foreign manufacturers and domestic ones. Thus, waterproofing systems are offered by the following trademarks Marshal, Kreps, Plitonit, Vetonit, Optimoc, etc.
In this case, it is understood that the wall of autoclaved aerated concrete is able to ensure the free passage of gases (CO, CH4, CO2) and vapors through the wall without moistening it, as well as the unhindered entry of fresh air into the room (atmospheric negatively charged air ions).
Due to the fact that autoclaved aerated concrete has a porous structure, it has excellent vapor permeability, which allows it to effectively remove excess moisture, both from the interior of the building and from the block itself. Thanks to this, it is possible to avoid the appearance and development of mold, fungus, as well as signs of decay in the aerated concrete wall.
Yes, there are. So load-bearing walls erected from autoclaved aerated concrete should have a height of no more than 20 meters and a number of floors – no more than 5 floors inclusive. Self-supporting walls made of autoclaved aerated concrete can have a height of no more than 30 meters and a number of floors – no more than 9 floors inclusive.
For the construction of external load-bearing walls, aerated concrete blocks with a width of 300 mm or more are mainly used. Aerated concrete blocks of smaller width cannot provide the necessary bearing capacity, will not allow to place a reinforced belt of the desired section, and will not allow to support to the required depth of overlap. In addition, external walls with a thickness of less than 300 mm will require additional thermal insulation measures, which can lead to a partial loss of the vapor permeability of the wall and an increase in its fire resistance.
When building internal load-bearing partitions, it is best to use aerated concrete blocks with a width of at least 250 mm, since otherwise these partitions will not allow for normal support of floor slabs, which should be at least 120 mm.
For the construction of internal non-bearing partitions from aerated concrete blocks, it is recommended to use blocks with a thickness of 100 mm or more. To achieve the best soundproofing characteristics of the walls, it is best to use special partition blocks with a thickness of 150 mm or more.
According to the requirements of STO 00044807-001-06, the outer walls of buildings built from aerated concrete panels or blocks are in no way inferior to structures built from concrete or brick. The predicted durability of buildings constructed from autoclaved aerated concrete is 125 years, and the service life before the first overhaul is at least 55 years. For example, according to technical documentation, the duration of effective operation of a house insulated with polystyrene boards or mineral wool before the first overhaul is no more than 20-35 years.
Yes, aerated concrete blocks can be laid on any of their surfaces. Due to the fact that the structure of aerated concrete blocks, and hence the characteristics of the building material, are the same throughout the volume and in all directions, aerated concrete blocks can be laid on any of its sides. With strict observance of the masonry technology, this in no way can affect its reliability and durability.
U-shaped blocks are used in the arrangement of door and window lintels in walls built from aerated concrete blocks, as well as in the construction of monolithic stiffening belts, rafters, beams, mauerlats, and also as supports for the overlap of supports.
U-shaped jumpers are recommended to block openings no more than 2.5 meters wide. In this case, the depth of support of the jumper on the load-bearing wall should be more than 200 mm.
Yes, definitely. The use of thinly jointed laying of aerated concrete blocks on the adhesive mixture allows minimizing the heat loss of the walls, preventing the possible appearance of cold bridges, and as a result, reducing the cost of heating the house, making it warmer. In addition, thin-seam masonry allows you to reduce the time spent on the construction of walls. The wall will turn out to be more even, which will additionally reduce the physical and financial costs of its subsequent finishing.
No, not allowed. When laying aerated concrete blocks on glue, its thickness should be less than 4 mm, otherwise it loses its physical and mechanical characteristics. During the laying process, the appearing irregularities of each row should be leveled with a special grater for aerated concrete, but in no case with a thick layer of glue.
No, it is not recommended, because even with thorough mixing, the “yesterday’s” solution has already lost its necessary qualities. When performing masonry work on the adhesive mixture, always try to calculate its consumption, do not leave the solution for tomorrow. Always prepare a “fresh” adhesive mixture before starting work.
Basically, due to the correct geometry of the blocks, the aerated concrete wall does not need special preliminary preparation. If you find protruding dried adhesive residues on the walls, they can be easily removed with a spatula or grater. The aerated concrete wall is basically smooth and ready for finishing, it is enough to apply a thin layer of putty or plaster on it. It is recommended to apply various plaster compositions on a special plaster mesh. On a previously prepared wall surface, you can apply a layer of decorative interior paint, decorative putty or paste over it with wallpaper.
It is possible, but it is necessary to use special dowels for installation in a wall built of cellular concrete. The main difference between this fastener is that it should not be driven into the wall (like a regular anchor), but screwed. Dowels designed for installation in a wall made of cellular concrete are capable of withstanding a bearing load of up to 100 kg/m2. In addition, special anchors, both mechanical and chemical, can be used to fasten various structures to aerated concrete walls, for example, rafters. If it is necessary to fasten light (insignificant) goods, for example, paintings, timber for siding, etc. conventional wood screws can be used.
Aerated concrete is a non-combustible building material, in accordance with GOST 30244 and GOST 31359, with low thermal conductivity. The latter contributes to slowing down the rate of loss of its strength when heated. Repeated tests on the fire resistance of partitions (according to GOST 30247.1) have shown that aerated concrete blocks with a density of D400 to D600, having a thickness of 75 mm and 100 mm, are able to withstand the effects of fire without loss of integrity and reduction in heat-insulating properties for 150 and 180 minutes, respectively. Aerated concrete blocks received the fire safety class K0 (not fire hazardous), the type of fire barriers – 1, the fire resistance limit as a barrier is not less than EI150 and EI180.
At the moment, aerated concrete houses are considered one of the most environmentally friendly. In the production of aerated concrete, only natural ingredients are used – lime, ground quartz sand, cement and water. Aluminum paste is used as a blowing agent, which completely dissolves (dissolves) as a result of a chemical reaction. In the process of production of aerated concrete blocks, no chemical or other harmful additives are used. During long-term operation, aerated concrete walls do not emit harmful or toxic substances, they are completely harmless to human health and the environment.
No, aerated concrete blocks are not radioactive. According to its radioactivity, this building material is usually classified as class I (the lowest level). It has reduced radiation Aeff=54Bq/kg. The same class of radioactivity includes building materials such as gypsum, wood, asbestos cement and others.
Exterior finish “wet facade” is the most popular finish for houses built from aerated concrete. As a rule, during its arrangement, a heat-insulating layer (foam plastic or mineral wool) is first attached to the aerated concrete wall. The heat-insulating material can be either fixed with the help of special facade dowels or glued with an adhesive solution. A reinforcing mesh is attached to the insulation layer from above, on which the base (first) layer of plaster is applied. A layer of decorative acrylic, mineral or silicate plaster is applied on top of the prepared base. These plaster mixtures should be applied in a thin layer in order to minimize the load on the layer of thermal insulation material as much as possible.
Currently, the quality of the material for thermal insulation of houses built of aerated concrete can be used either foam or mineral wool. If you have a choice, it is best to use mineral wool. Its main advantage over foam plastic is its high vapor permeability, which is ideal for aerated concrete houses. The second indisputable advantage is high fire resistance, since mineral wool is a non-combustible material. When buying mineral wool, special attention should be paid to its sufficient density, it should be more than 140 kg / m3.
In order to achieve the best effect of the waterproofing layer, we recommend heating it with a blowtorch during installation.
The maximum allowable distance for which an aerated concrete block can be moved outside the basement is determined as 1/3 of its width. So, for example, if the width of the outer wall along the block is 375 mm, then the block is allowed to “hang” over the outer edge of the base at a distance of no more than 125 mm.
Yes you are right. If the width of the window or door opening is less than 2.8 meters, the laying of metal reinforcing bars is not necessary.
Since autoclaved aerated concrete is usually classified as a non-combustible building material, it can be used as fireproof walls. So, for example, with the help of aerated concrete blocks, a supporting metal frame is fenced in multi-storey buildings, etc. When aerated concrete comes into contact with hot air or smoke, the walls of the chimneys will smoke, but the soot will not penetrate inside the material over time, but will only accumulate on its surface. When buying aerated concrete blocks, it is imperative to require an appropriate fire safety certificate from the seller! With direct contact of aerated concrete with hot steam, it will be saturated with moisture, but to a depth of less than 1.5 cm. Moisture cannot penetrate deep into the material. At the same time, it should be noted that the strength characteristics of the contacting aerated concrete layer during long-term operation are practically not violated.
In the event of the appearance of a lateral force capable of breaking the glue seam at the junction of the walls, and in addition to bending the metal plates of the flexible connection, which are rigidly fixed in the wall at one end and inserted into the horizontal seam at the other, then this force will first have to destroy the wall masonry on this plot. Simply put, if you hit any section of the wall with sufficient force, then this section of the wall will collapse.
Yes, there is, a type of masonry mortar. The first row of aerated concrete blocks must be laid on a cement-sand mortar, and all subsequent rows must be laid using a special adhesive composition intended for laying blocks made of cellular concrete.
This should not be done. It is necessary to cut the chips on both parts of the blocks with a hand saw in the transverse direction. The resulting halves with smooth end surfaces are stacked like ordinary blocks.
No, not allowed. After the construction of the walls, they must be plastered with finishing putty, and then either painted or wallpapered.
Yes, you can. There are several ways: using a hose hydraulic level or a laser level. The second method is unlikely to help you much in the daytime, since it is quite difficult to check the quality of the masonry when the visibility of the laser on the metric rail is low. The laser level will be convenient when using it inside the house.
This indicator mainly depends on the complexity of the structure and the qualifications of the construction team. Of course, the construction of houses with straight walls of great length requires a much smaller number of additional blocks than, for example, for laying an obtuse-angled wall.
In addition, there are cases when aerated concrete blocks cannot be installed into a wall at all due to their own various defects (multiple destructions, mismatch of overall dimensions, etc.). In this case, you need to apply with a claim to the seller of aerated concrete.
Micro cracks can form not only on walls built of aerated concrete, but on any other walls that are plastered incorrectly. The main reason for the appearance of micro cracks in the plaster layer is the weather micro-deformation of the wall or its shrinkage. In order to avoid such a defect, the wall must be finished using a special reinforcing mesh.
Yes, you can build without a ventilation gap. In addition, the entire wall structure without it will be stronger. At the same time, it must be borne in mind that the interior should not contain high humidity (for example, a sauna, bath, bath, etc.), since in this case the wall will dry much longer.
If you decide not to leave a ventilation gap in a multilayer wall, then you need to make sure that a dry and warm microclimate is always maintained inside the room, which is possible only with sufficient ventilation of the room, with constant heating in the autumn-winter period. In this case, the interior decoration of the wall with gypsum mixtures is allowed.
Most likely, we are talking about foam concrete, since the production of autoclaved aerated concrete requires special equipment (at least an autoclave oven) and strict adherence to its production technology, which is possible only in the factory. In addition, the blocks are cut using special equipment, which guarantees precise observance of the overall dimensions and geometry of the blocks.
Foam concrete blocks can be produced both in the factory and at home (handicraft) conditions. Foam concrete does not undergo pressure treatment in special ovens (autoclaves). These blocks are made using injection technology, which in most cases cannot guarantee the accuracy of their dimensions and the ideal geometry.
It is allowed to glue plasterboard sheets directly to the walls of aerated concrete. It must be borne in mind that for the installation of drywall sheets, a perfectly flat surface is required, which can only be achieved using a plaster layer or using special guides.
Drywall by its nature is a vapor-permeable material that cannot interfere with the normal “breathing” of aerated concrete walls.
When using winter glue, it is possible to lay aerated concrete blocks at an outdoor temperature of at least -10 ° C.
It is possible, many and enough parts are building baths using aerated concrete. In this case, special attention must be paid to several important points:
• exterior finish must necessarily be made in the form of a ventilated facade with an air gap of 3-5 cm (siding, facing brick, blockhouse, lining),
• external walls from the inside of the room must necessarily have coating waterproofing,
• aerated concrete blocks with a thickness of more than 400 mm should be used during construction.
Strictly adhering to these recommendations, you can easily build a warm and reliable bath.
Practice shows that aerated concrete blocks practically do not shrink. Shrinkage is possible only in a layer of cement-sand masonry mortar. If during construction a special adhesive for laying cellular blocks is used, which does not shrink, then it is possible to simultaneously lay blocks and brick cladding. Moreover, this will be the most optimal option, in terms of work productivity, since the same scaffolding will be used (they will not need to be transferred several times).
A bunch of aerated concrete blocks and facing bricks is best done using flexible ties. Even if there is a change in the position of the wall relative to the facing layer, then destruction will not occur, since this deformation will be compensated by flexible connections.
It is recommended to use at least 4 flexible ties per 1 m² of masonry.
In order to calculate the number of aerated concrete blocks in one cubic meter, it is necessary to divide 1m3 by the volume of one block.
In other words, with the overall dimensions of the aerated concrete block 200x288x600 mm, it is necessary to perform the following simple arithmetic operation: 1 ÷ (0.2×0.288×0.6) = 1 ÷ 0.03456 = 28.94 pieces.
No, there is no fundamental difference between them. Foam and aerated concrete are cellular concrete, and the glue is intended for gluing exactly materials from cellular concrete. The adhesive mortar in its composition and properties is very close to tile adhesive. Its main and only difference from tile adhesive is the presence in the composition of special additives that prevent it from drying out quickly.
Aerated concrete masonry can be started from almost any level. There is only one problem – how to protect the wall from getting wet (snow, rain, etc.).
If the aerated concrete wall may come into contact with melt water or snow, then these places must be carefully waterproofed with roll or coating materials. The waterproofing layer must fully protect the aerated concrete wall from external moisture.
In Ukraine, such structures can not often be found. Usually, aerated concrete masonry begins at a height of 50 to 70 cm from ground level. Abroad, laying from the foundation of aerated concrete blocks is quite popular.
The useful information section contains a lot of necessary and useful information about aerated concrete and its application.