Grinding the concrete floor with their own hands. Step by step instructions for sanding

Sanding the floor with their own hands for a concrete base video instruction on how to perform the work

Given the current trends in the construction industry, it is not surprising to see more and more concrete floors. their characteristics allow them to compete on an equal footing with other coatings.

By sanding the concrete surface, you can achieve an even better result. the finished floor has a lot of advantages, among which we can highlight the following:

  • Simple and cheap surface care;
  • Reliability, high quality and long service life;
  • Good compatibility with various decorative coatings;
  • The possibility of use both in the building and in the open area;
  • Excellent water resistance and resistance to various chemical influences;
  • High mechanical and abrasion resistance.

Grinding itself. this is a type of treatment of the concrete surface, which allows you to remove old or damaged coating, level the base and the screed before applying protective materials (varnishes, impregnation, paint or filler coating based on polymers).

The technology of grinding concrete includes several steps. The first of these is the pre-sanding of the concrete floor, which is usually carried out 3-5 days after the concrete base is poured. The final sanding can be performed only after the surface of the floor finally cured.

If the floor is poured with concrete from scratch, you will first have to remove the lime milk, which will certainly act on the surface in the process of pouring. With old concrete floor can be done easier. the process of grinding reduces to remove the top layer of concrete.

In addition to eliminating irregularities, grinding the floor screed provides an opportunity to qualitatively clean it from dirt and other imperfections. No matter how long ago the concrete was poured, after treatment it will be refreshed and the adhesion will increase.

Another benefit of concrete sanding is that it makes the floor very suitable for any coating that needs a perfect substrate. As an example, we can take the situation with poured floors, before the arrangement of which a number of preparatory work, which includes grinding, which allows you to remove the damaged top layer.

Surface defects can also be restored in the same way. Sanding allows you to remove this layer, thereby not only improving its appearance, but also significantly increasing the performance. Another important task, which solves the grinding. untreated concrete floor absorbs water, which at subzero temperatures can lead to its destruction.

Grinding can be done with or without polishing the concrete. In the first case, the shiny surface of the floor serves as an independent surface finish. In the second case, the concrete floor’s tough roughness is left untreated and serves as an excellent substrate for impregnation, protection and finishing coatings. They all have a beneficial effect on the appearance and durability of the structure.

Grinding procedure is necessary when the concrete floor is worn out, when its top layer is destroyed by periodic cycles of freezing and thawing of moisture trapped in the surface structure. After its removal, the floor will regain its former durability. In addition, grinding concrete helps level out deformed areas of the floor that have ripples, chips, small bumps and cracks. A polished or topcoated surface is required in either case.

Any concrete, no matter when it is laid, can be grinded. If such floor treatment is planned in advance, it is important to choose the correct composition of the working mixture when arranging it. For outdoor areas, warehouses, garages or production shops suitable concrete M100-M300. For future grinding it is endowed with excellent properties. A stronger floor can be made with concrete of grade 350 or higher.

As the filler of the concrete mixture for the screed with its subsequent grinding fine-grained crushed rock is used. Too high a density of filler may make it difficult to finish the floor abrasively, and too low a density may reduce its strength. That’s why you should choose a medium option.

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Concrete with marble crumb is very easy to grind, processing of the material containing granite and gravel, is more difficult. Beautiful and original surface of the floor can be obtained after grinding and polishing concrete screed with fine fractions of marble chips or granite.

What is a grinding machine

Processing stone surfaces by hand is difficult and time-consuming. To facilitate labor and save time of work, special power tools are used.

A concrete sander is suitable for such surfaces.

The power tool is a rotating disc to which the abrasive element is attached. Different grit sizes of tools, as well as adjustable power, allow you to achieve different types of surfaces: matte, glossy, mirror-glossy.

Methods of grinding the floor

One of two methods. dry or wet. are used. Preference should be given depending on the material to be processed.

Dry method

This method is preferred in most cases during the grinding of the concrete floor, as it is simpler and generates much less dust, so that in the course of work is much easier to perform the adjustment of the coating processing. The maximum depth of the removed layer reaches 0.2 cm. In contrast, the wet method involves a high probability of scratching the surface, but the sanding is much faster.

In the course of grinding in a dry method is also formed a fairly significant amount of cement dust, which rises into the air, but also rather quickly settles, allowing full assessment of the result and if necessary to eliminate the remaining flaws. Because of this you must always use protective equipment (respirator and glasses) and it is desirable to use a vacuum cleaner.

Wet method

In the course of its use the nozzles with different levels of abrasiveness are used. At first, softer elements are used, with a gradual increase. Because of the large number of nozzles needed, this method is more expensive than the dry method.

The permissible thickness of the removed layer is up to 0.5 cm, due to which the initial processing after 3-5 days after completion of the filling screed in the air rises a substantial amount of wet dust. It is much more difficult to grind in this way because of the dirty splashes that increase the time of work.

For their elimination need to resort to the use of a water pump, through which still not always possible to fully control the resulting inaccuracies and deficiencies. This method is optimal when processing a concrete floor with the presence of mineral crumb or mosaic, as well as before laying tiles on it.

Performance characteristics of the sanded floor

Grinded concrete has serious characteristics that are not inferior to most high-quality finishing floor coverings. Here are just a few of them:

  • Such a flooring will last for more than a dozen years. This is not only due to the high strength of the concrete, but also to the resistance to moisture. Without sanding or finishing, concrete floors quickly absorb moisture into themselves, losing performance and technical characteristics.
  • If you sand the concrete substrate and polish it, it can be compared to poured floors.
  • The cost of construction sanding operations performed is low.
  • A sanded surface is the perfect base for finishing.
  • Such floors do not emit dust, as already mentioned above.
  • Sanding makes it possible to level the floor a little.
  • Such a flooring does not require repair. But even if for some reason on the section of the floor suddenly appeared defects, it is not difficult and inexpensive to repair them.

Attention! Note that grinding concrete floors does not solve the problem of uneven floors. This operation has completely different tasks. Therefore, even at the stage of formation of the basis, pour the screed on the level.

How to pour polymer flooring Source

Why is it necessary to sand the concrete?

Correctly sanded concrete, even without a protective layer, improves its characteristics:

grinding, concrete, floor, their, hands, step
  • Facilitates the care of the concrete floor;
  • The service life is increased;
  • Concrete surfaces fit well into most interiors of commercial or public buildings;
  • Is not afraid of aggressive influences, so it can be used on the street;
  • Has a high mechanical strength, which prevents the formation of cracks and joints.

This is due to the fact that the features of the ground concrete floor are water resistance, resistance to chemicals, and the top layer is strengthened.

This procedure is usually performed on horizontal concrete surfaces in order to improve their quality by removing the less durable top layer. Lime milk accumulates on the freshly poured mass, reducing its strength. On the third or fifth day, the first phase of work is done, and the full cycle ends after the mortar has hardened. Concrete surfaces ground by special equipment are exceptionally smooth, but with a high level of adhesion, which is important for the application and lasting retention of protective coatings.

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Old concrete screeds or structures always have a damaged top layer, as it absorbs moisture, has microcracks and other small defects. When grinding it, the task is to completely remove it, remove dirt, chips and surface cracks. Before you grind the old concrete floor must make sure that it has no ripples and has a horizontal direction, such problems are corrected only when pouring a new screed.

Grinding a concrete floor: the advantages of coverage

The floor, made of concrete, which has undergone a preliminary grinding, has become widespread. This is due to its performance qualities, such as wear resistance, durability, resistance to abrasion and other mechanical effects. The price per m2 of concrete floor sanding depends on the characteristics of the coating itself and its area. Consider other positive characteristics of such smooth covers.

Particular attention must be paid to the service life of the concrete floor. It can reach several decades, and in some cases even more. It can be found in public places all over the world. Not only concrete but also marble floors are treated in this way. Grinding produces a glossy surface that is resistant to moisture.

The concrete floor can last for decades.

Another advantage of such coatings is their cost. It is worth mentioning that a perfectly flat surface can be subsequently sanded and used as the main surface. But such a floor also often serves as a substrate that is treated with decorative materials. Such surfaces do not need periodic repairs. Localized defects can easily be repaired if necessary.

The advantages of professional grinding equipment

In comparison with manual devices, which are designed for processing small areas, these units have many advantages. Consider the advantages of such sanding equipment in more detail.

grinding, concrete, floor, their, hands, step

The main advantage of such machines is that they include in their design regulator. When switching this device, the speed of rotation of the working parts changes. Wet processing of surfaces is greatly simplified with professional equipment. Concrete sanding machines are able to supply the necessary amount of liquid, which binds dust particles and does not let them rise into the air.

Dry sanding is also much easier and faster, as professional units have a special dust collector. As a result, the treatment is done with minimal contamination.

The use of professional equipment guarantees the quality of the sanding

Note! The modern market offers the manufacturer a wide range of machines for grinding concrete floor. Some of them are positioned as equipment for home use.

Works to improve the surface of concrete floors, carried out with the use of special units, are highly accurate. The maximum error does not exceed 2 mm. Such machines are easy to operate and do not require permanent maintenance.

Repair of concrete floor: peculiarities of the process of restoration and complete replacement of the screed

Peculiarities of work performance in a private house and industrial premises. Cost of repair work. Recommended formulations.

The availability of interchangeable nozzles for surface treatment makes it possible to control the roughness of the floor. This allows you to get exactly the result that was conceived at the beginning of the work. However, for grinding concrete with your own hands it is better to buy a less complex device.

Special equipment has many advantages, but there are also some disadvantages of its use. First of all, all such machines emit a lot of dust, and they are also quite noisy. Of course, their main disadvantage is the high cost. Before purchasing a particular unit, experts strongly recommend that you familiarize yourself with the list of equipment and study the technical characteristics.

Grinders are easy to operate and do not require constant maintenance

Angle grinder with an attachment: equipment for domestic use

It is not reasonable to buy expensive grinding machines for household use. If there is a need for correction and processing of the concrete surface of the house, then the best option is to use an angle grinder with special attachments.

Such a device is suitable for fast and effective grinding of small areas. Such tools have a democratic cost, which is often a determining factor in their choice. Concrete grinding angle grinder has yet another advantage: due to the compact size of the device is possible to handle hard-to-reach areas.

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Working tool of the angle grinder can act as a disk. As a rule, it is characterized by a small diameter. The effectiveness of the discs is ensured by the diamond coating. Bowl-shaped nozzles are an alternative to discs.

The quality of processing the concrete surface directly depends on the weight of the tool. For floor polishing in the home use small machines, which are equipped with a diamond disk. These units do not have a planetary mechanism, but are highly effective.

With the help of an angle grinder there is an opportunity to process the concrete floor in hard-to-reach places

Floor sanding “helicopter”: features of the equipment

Professional and semi-professional devices, which can be found on the modern market, are in high demand. The most popular among them are those models that have been produced by European and American manufacturers.

Note! The quality of domestic machines is slightly lower, but they have a more attractive cost.

Among all devices used for sanding floors, it is worth allocating models, which masters call “helicopters”. The use of such a device allows you to get a perfectly smooth surface. Today there are two varieties of such units:

Models belonging to the first group are characterized by their compactness and ease of use. In turn, twin-rotor units belong to the complex equipment for grinding concrete floors. Such grinders are characterized by large dimensions and have a special operator’s chair.

Grinding helicopters are in high demand

Grinding machines, equipped with several blades, perform surface processing in two stages. First, a low-grade sanding is performed with the help of special nozzles, which are fixed on the blades. During the second stage, the blades are used directly, moving at high speed.

Repair of concrete floor by grinding

As a result of prolonged use, small potholes and cracks may appear on the surface of the coating for a number of reasons. In this case it is necessary to immediately make repairs and grinding of the concrete floor with an angle grinder.

If a pothole is found it is necessary to cut out the damaged part of the flooring to a depth of 20 mm using a stone disk with a diamond tipped applicator. After cutting through the edges of the problem area, its contents should be removed with a peorator or chisel. The resulting cavity must be freed from dust, primed with a penetrating composition and fill with repair mortar, using a metal trowel.

Then use a small ruler or straight edge to level the area to be paved flush with the floor surface. After the setting of the repair mixture, the disk on the “angle grinder” should be changed to a bowl with an abrasive spray and gently grind away the problem area. Then it can be treated with a material identical to the main coating of the concrete floor.

If there is a crack in the floor, it should be cut to a width of 100 mm with an angle grinder, equipped with a stone disk. After that, the cavity must also be freed from concrete fragments, dust, then primed and filled with repair mortar containing as a filler silica sand. When the mixture sags a little in the recess, it is worth to lay its second layer and level it with a trowel. After the curing of the mortar, the crack should be grinded with an angle grinder using the method described above.

How to grind a concrete floor. see at

If the technology is followed, a perfectly sanded concrete floor has excellent wear resistance, excellent decorative characteristics and ease of use. The cost-effectiveness of such a floor is confirmed by the absence of frequent repairs and the long-term preservation of its attractive appearance.

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