2023 Author: Philip Bishop | [email protected]. Last modified: 2023-05-24 22:24
- Advantages and disadvantages
- Types of sand concrete
- Features of the M300
- Screed stages
- Preparatory activities
- Pouring solution
When constructing a sub-floor, a material such as sand concrete is very often used. It has many qualities that distinguish it from other similar materials. The main properties are manifested more due to the addition of plasticizers and modifying substances to the composition.
During repairs in an apartment or after settling in a new building, the question arises of how to competently and profitably arrange a surface for subsequent flooring. In this case, sand concrete for floor screed will certainly do. Despite the somewhat higher cost, the qualities and the ability to withstand mechanical stress are increasing. The composition of sand concrete includes components such as:
- Plasticizers and other synthetic substances.
Each of them creates certain properties and qualities that allow you to get and come to the desired result. In addition, the consistency of the ready-made solution required for pouring the floor screed changes. They are able to increase the ability to withstand even more stress, temperature changes and other negative manifestations of the indoor environment. In addition, sand concrete is made from sand of various fractions. This gives the name to it as coarse or fine grained.
If the room where the floor screed is performed has a specific microclimate, then a conventional cement screed will not be the best option. In this case, the reinforcing screed may also suffer due to the ingress of moisture into the solution even after drying.
Sand concrete is characterized by such properties as excellent resistance to low temperatures, as well as significant external influences. In addition, moisture is not terrible for him, which makes it possible to use such material in appropriate rooms. It is for this reason that you should familiarize yourself not only with its many positive aspects, but also with the possible disadvantages that you may encounter if you fill the floor with sand concrete.
Advantages and disadvantages
The choice of mixture will depend on the advantages that appear. Experts give preference to sand concrete, as it is famous for the following qualities:
- Long service life after installation.
- Ability to withstand temperature fluctuations in a room.
- The solution is prepared at one moment and no special knowledge from the performer is required here.
- Resistant to corrosion processes.
- Frost resistance.
- Heat and sound insulation properties are at a high level.
When choosing a specific option for a mixture, you should pay attention not only to the components and ingredients, but also to the brand of cement.
When work is performed on its own without the involvement of specialists, attention should be paid to possible difficulties and disadvantages. Almost every novice builder encounters them.
- Cement mixes cost slightly less than sand concrete for floor screed.
- The characteristics and properties of the mortar in the rough version of the floor are reduced if the finished mixture is mixed with poor quality. This is also affected by the deviation from the sequence of work and the addition of various components.
- Uniformity is difficult to determine if the work does not use special tools and equipment. This only causes additional installation costs.
These disadvantages arise only for the reason that the technology for performing the floor screed was not followed already at the initial stage. In general, the quality and strength of the base is much better than when using a conventional cement screed.
Types of sand concrete
The quality of sand concrete is greatly influenced by the type of cement used. He can be:
M150. Serves for facing work, laying masonry, leveling the floor surface (defects).
- M300. Suitable not only for the foundation, but also for the subfloor.
- M500. Any kind of work can be carried out when using sand concrete with this brand of cement. This is the most excellent and high quality option.
As for the latest brand of cement, few people use it for its intended purpose because of its high cost. The best option is the M300, which has sufficient qualities and properties. You can talk about it in more detail because of its active use in work.
Features of the M300
Filling the floor with M300 sand concrete is most often done. The solution after preparation is quite dense. It can be used not only for internal repair work, but also for external ones.
After the arrangement, he is not afraid of precipitation, low temperatures, especially if the composition contains appropriate additives. If there is a positive temperature after installation, then the solidification process will take a minimum amount of time.
After pouring, the solution has the properties of self-distribution over the surface. Of course, this should be helped with a rule or a spatula, but the result will delight everyone. Financial costs, even with a significant expense, will be minimal. The price for sand concrete M300 is acceptable.
There are three main steps to be followed when screed with dry sand concrete:
- Preliminary. The surface is being prepared for work.
- Preparatory. Measures with mixtures and proportions of the solution.
- Main. Pouring process.
Each stage deserves attention and requires a detailed description in order to understand in detail all the subtleties and recommendations from specialists.
To begin with, you should not only remove all the debris, then vacuum, but seal cracks, potholes with a solution, get rid of protruding elements. There may be invisible places, but very suspicious. To do this, they should be tapped to determine the voids. If you do not notice in time the detachment of concrete under the future screed, then problems will arise in the future much more.
The future screed must be marked. A laser level will help with this. If funds do not allow, the water level will not work either. From the floor slabs, a horizontal line is determined across all rooms where work is carried out. The distance is taken to be about 1 meter. The set points are subsequently connected to each other. This will be the zero level, which serves to further align all parameters.
Further, the establishment of the highest and lowest point in relation to the floor occurs. The thickness of the screed should be at least 2 cm. When using a layer of insulation - at least 4 cm. Having learned these parameters, you can calculate the required amount of mortar for work.
When sand concrete is used, the floor screed in the apartment turns out to be strong and strong. But in order for the level of adhesion to the surface to be at a high level, the base is lubricated with a roller with a layer of primer. If necessary, there can be several layers.
For a high-quality filling, you should prepare the surface and do not forget about installing beacons around the perimeter of the room. The best option would be galvanized slats. In the future, it will be much easier to pull together the solution according to them.
They unfold from the window to the front door and initially along the long wall. The optimum batten length is 2.5 meters. Everything else will already be adjusted to the area of the room itself. To ensure that the beacons are positioned correctly, use the rule and level.
If the lighthouses are laid on a plaster solution, then it should be remembered that before pouring the solution, time should be given until it is completely dry. Laying on plaster slaps is carried out progressively, pushing the beacons into the masonry.
This stage of the installation of the floor screed in the room should be carried out within one day for each room. This will avoid the appearance of transitions on the floor, as well as joints between filled rows.
There are many options for sand concrete for floor screed, which is better, must be determined individually, depending on the work carried out and the wishes of the customer. Most often, it is the M300 that is used due to its low cost and excellent technical characteristics. The composition of the mixture already includes the necessary components to give the finished solution resistance to temperature drops in the room, low temperatures, to increase strength and plasticity. The mixtures are packaged in bags of 40 or 50 kg.
Mixing of the solution is carried out in a plastic bucket or other container that is available. High-quality mixing is achieved when using a perforator with a nozzle. The amount of water is 30% of the dry mix. For a high-quality solution, initially you need to add a smaller amount of water, and only then, while stirring, monitor the condition, adding it in the required volume. After finishing, let the mixture stand for about 15 minutes. During this time, all the components that make up the composition dissolve.
The pouring of the mortar begins in the far corner of the room, starting from the wall and to the nearest located lighthouses. Not the required amount is poured, but a larger one, which is subsequently stretched to the entrance using the rule.
After the floor is filled with sand concrete, the solution should be infused. Not everyone knows how long it will take to dry completely. Everything will depend on the indoor temperature, humidity level. After 3-4 days, you can move along it without any problems. Complete drying is achieved 3-4 weeks after the end of the work. This indicates that any kind of flooring can be started.
The best sand concrete for floor screed will be exactly the one that is suitable for achieving the desired goals. Each brand corresponds to a specific drying period, specific work. It will not be superfluous to consult in the store what and how best to choose for a particular room. Only after purchasing the required amount of sand concrete can you start pouring the floor screed in the apartment. In addition, the leveling of floors with sand concrete is very simple and does not require serious knowledge in this direction of construction.
The actual question remains on the consumption of sand concrete for filling the floor. After all, you need to immediately decide on how much to spend on materials so as not to be distracted by trips to the store. There are factors that influence this:
- The thickness of the screed to be performed.
- Floor covering or type of floor finish.
- Difference between minimum and maximum sub-floor levels.
There are established guidelines for ready-made mixtures. For each square meter of the premises, we need about 60 kg of sand concrete. Here, the average screed layer is taken into account - 30 mm. Expanded clay can be used to reduce costs with thick floors. You will have to buy it for every 1 cm of thickness 0.01 m 3. One bag of such material is the execution of a layer indoors on an area of 5 m 2.
The proportions of the components of the mixture must comply with generally accepted standards. You cannot deviate from them if you want to get a positive result. Strength is not achieved with a small amount of cement, and cracks will begin to appear with a higher ratio to sand. So it would be optimal to buy a ready-made sand concrete mixture and add the required amount of water to it.