Standard cement-sand screeds, used everywhere, have certain disadvantages: a heavy load on the foundation or floor, high thermal conductivity. An alternative is a popular now pouring the floor foam concrete – a modern durable material. Foam concrete allows you to perfectly level any base, hide the unevenness, differences created by overlapping.
Advantages of foam concrete
- Low cost and minimal transportation costs for raw material delivery.
- Excellent thermal and sound insulation characteristics due to the porous structure of the composition.
- Low weight load on the structure (3 times less than the concrete screed).
- No need for previous preparation of the base. The mortar can be laid on any surface, even a very uneven one.
- Ease of use and high speed of work.
- Ideal for underfloor heating systems.
- Durability – the duration of operation is at least 50 years.
The disadvantage is the need to purchase equipment for laying the mixture on the base.
Tools and materials needed for the work
For laying foam concrete you will need:
- Mobile installation for the supply of concrete;
- Wooden beams;
- A plank or elongated rule for leveling;
It is also worth taking care of personal safety when working and buy rubber gloves, a respirator and safety glasses. The foam concrete mixture is prepared directly at the site of the work from the following components:
- Cement grade M300 or M400;
- Filler (fine sand, crushed gravel, concrete scrap, ash and slag);
- Foaming agent;
Foam concrete must comply with the requirements of GOST “Aerated Concrete”. There are several methods of preparing the mixture: barotechnology using a sealed tank, which is pumped under pressure air, mineralization – a process without the use of water and the classical way (the most difficult), when the foam is sent simultaneously with the solution in a drum and then the finished structure is delivered to the site of the casting.
In industrial and residential premises for the arrangement of the floor of foam concrete is used pouring density up to 800 kg/m3. The optimal arrangement of the floor: the bottom insulating layer of foam concrete density 300-600 kg/m3, the top – the screed with a density of 700-800 kg/m3. In general, the design of the foam concrete floor is designed for each individual object, taking into account its purpose and the main characteristics. Preliminary surface preparation is not required. To control the levelness of the screed, you need to install beams with a spacing of not more than 2 meters and beacons at a distance of about one meter from each other, as which you can use scraps of profiles for plasterboard. Foam concrete is poured using a mobile unit with a capacity of 10-15 cubic meters per hour on the ground and leveled carefully with slats on rails. The mortar is hosed up to 60 m horizontally. The thickness of the screed layer should be between 30 to 100 mm. During the drying process it is necessary to sprinkle the base course with water periodically to prevent it from drying out. After complete drying, you can start laying the top layer of reinforcing self-leveling mixture or tiles. Keep in mind that this stage is mandatory, as parquet, linoleum and laminate must not be laid directly on the layer of foam concrete.