Concrete sanding with your own hands. Grinding a concrete floor

How to grind a concrete floor with an angle grinder itself and avoid mistakes

Before how to grind a concrete floor angular grinder need to familiarize yourself with all the nuances and the correct sequence of operations, so the processing of the surface will be able to perform not only much faster, but also qualitatively.

After its implementation, the coating acquires a number of the following positive qualities:

  • No need for periodic surface restoration.
  • In the course of grinding the floor becomes resistant to moisture, aggressive chemicals, as well as to high traffic and movement of equipment with a large weight.
  • When quality work is carried out the surface becomes an attractive appearance, and during operation it does not need a huge financial outlay and a lot of time to take care of it.
  • When brought to the gloss of the floor in the course of sanding, it becomes very similar to the elite poured coatings.
  • No harmful dust is released during operation.

Please note! Before you grind the concrete floor angle grinder should necessarily wear a respirator and safety glasses.

Why you need to sand a concrete floor

It should be noted that concrete, if special technologies are followed, can be not only an intermediate, but also the finish of the floor. over, there are several normative types of concrete, which can be a floor covering. For example concrete-mosaic, cement concrete or polymer concrete floors.

Concrete floor sanding is performed in the following cases:

  • For polished concrete floors. Here it opens up the pores of the concrete for subsequent priming;
  • Mosaic floor sanding to highlight stone inclusions. This is a deep sanding technique;
  • Operating concrete floors are grinded to remove dirt and to remove the worn surface layer;
  • Also, the sanding technology allows you to eliminate irregularities and other minor defects in the pouring of concrete.
concrete, sanding, your, hands

Sanding is not the final stage of the work, it is a type of preparatory work in a series: priming, milling, dusting, etc. п.

Grinding procedure

Any finishing work requires careful preparation of the surface, the process of grinding the floor is no exception.

  • If the floor is newly poured, you need to check its evenness with a long ruler, level, or leveler. When working with an old coating, you should get rid of the remains of the previous finish. Remove debris, dust, dirt, remove exposed metal mesh or reinforcement, if any.
  • If there are deep potholes, cracks or large deformations of shrinkage joints have to work with them first. Caulk them with a mortar of high strength, preferably using tamponazhnogo cement, to ensure high-density filling. You can also use epoxy mastic for caulking. Filling defective areas should be done flush with the main surface.
  • In the case of revealing concrete bumps, swellings in the field, they must also be removed before the start of the final sanding. Work angle grinder with diamond disc number 30-40, indicating the granularity of the working area.
  • Remove the top layer of grout first from the new screed. Sanding the existing floor to remove damaged areas, minor deformations and shallow stains.

To grind their own hands can begin no earlier than 14 days after complete drying of concrete or cement screed. If you don’t wait this period of time and work with a wet surface, the angle grinder can simply tear pieces of gravel out of the concrete mass.

Floor polishing

You can work with the surface only after its complete hardening, that is, not earlier than 10-14 days. For the job, you need to buy circles with different sizes of abrasives. For example, for the primary finish is advised to choose a crumb of 25-30 units, and for the final. 40. To give a glossy smoothness to the polished concrete is possible by using crumb tips with a size of 1500 to 3000 units.

  • Apply to the floor surface a special solution, which reacts with the concrete and forms a protective film.
  • If the tool for grinding is used for the first time, be sure to study its instructions for use or watch a special training video.
  • Wet or dry polishing to the desired smoothness.
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The technology of polishing concrete

The technology of polished concrete floors is becoming more widespread today. Proven to be reliable and economical, it is increasingly attracting the attention of professionals involved in the construction of floors.

Advantages of polished concrete

First of all, we want to note the practicality of floors made of polished concrete, as they have a high resistance to wear and durability. Such floors are easy to maintain: ordinary wet cleaning is enough. Besides, polished concrete floors do not leave marks from different chemicals and forklift wheels.

Since the composition of concrete does not contain any harmful components, the floors of this material are not only beautiful, but also environmentally friendly. Thanks to its alkaline nature, concrete is not susceptible to infestation by fungi and mould.

Among the many advantages of polished concrete we would like to mention the following:

  • versatility. Polished concrete floors can now be seen in stores, offices, hospitals, schools, homes and apartments;
  • Long service life in comparison with other coatings and conventional concrete flooring. Polished concrete is quite difficult to damage. There are no scratches and cracks even with the movement of heavy machinery;
  • waterproof, but the polished concrete is able to “breathe”. It is permeable to air and thus to moisture that evaporates naturally;
  • high resistance to chemical contamination and temperature fluctuations;
  • high resistance to abrasion;
  • the possibility of spot repairs of mechanical damage during operation;
  • High reflectivity. The glossy surface of polished concrete reflects the sunlight well, which makes rooms much brighter and saves up to 30% of energy;
  • aesthetic appeal. Polished concrete floors have a spectacular appearance. They have a glossy surface.

Polished concrete floors can imitate natural stone and/or be painted any color

Technological stages of polishing concrete

Polishing concrete. a fairly complex technological process, which can be carried out only by specialists with sufficient experience and knowledge. The quality of polishing works, in many respects, depends on the correct choice of working tools and equipment. Only a professional with extensive experience, who knows well what type of tool to choose, depending on the material to be treated, can cope with this task.

concrete, sanding, your, hands

The process of creating a polished concrete floor can be divided into the following main stages:

  • Preparation of the concrete base. At this stage all the old coatings (mastic floors, ceramic tiles, carpeting, etc.) are removed.). It is also necessary to repair chips, cavities, cracks and other defects;
  • sanding. This process is carried out in several stages, using special equipment and abrasive tools with different grits, ranging from 20 to 200 Grit. Grinding a new screed is performed not earlier than 28 days after it is poured;
  • Strengthening. Concrete surface on completion of grinding is impregnated with special impregnators, significantly increasing the strength of concrete;
  • polishing. This process is similar to grinding, but only performed with the help of abrasives with grain size of 300-3000 Grit. Polishing can include from 3 to 8 steps, depending on what degree of gloss of the surface is obtained. The feasibility of using the entire range of pads is determined by the specialist who performs polishing of the floor. Depending on the task at hand, it can exclude some transitions from the technological process.

Highly reflective properties of polished concrete. a very important property for hotels, restaurants, office space and other public places, which should always look clean and neat.

Rooms with polished floors are much lighter, so they use much less overhead light. The gloss level of a polished concrete floor is determined before the work is even carried out. Depending on the desired gloss selects the tool and the number of technological steps.

When polishing the concrete, you can achieve four degrees of gloss:

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If you look down on a polished floor with a first degree of polish from above, it looks hazy, with barely a hint of gloss. A semi-glossy matte surface corresponds to the second degree of polish. If you look down on it from a distance of about 30 m, you can see a very slight reflection of the upper light.

A surface with third degree of polish is much more noticeable and reflects light in it brighter. From a distance of 9-15 meters on the floor you can see a clear reflection of overhead and sidelight. On a concrete surface polished to the fourth degree of brightness one can see one’s reflection in full when standing on it. If one looks at such a surface from other points, it will seem wet.

There are special tables-metrics to determine the gloss level, and a special device. a glitter meter (glare meter)

The gloss value is expressed by the degree of reflection of light falling on the surface of the polished floor, and ranges from 20-30 units (weak gloss) to 70-80 (very bright gloss).

The simple beauty of polished concrete floors is expressed by a soft glossy sheen and similarity of appearance with natural stone. Grinding the concrete exposes aggregate (marble, granite crumb, etc.), which is often difficult to remove.). This is why the floor looks elegant and expensive. But the design possibilities of polished concrete are not limited to traditional concrete fillers.

Preparation work

Preparation is a very important stage of the work, in which you need to consider the following points:

  • If there is some kind of coating on the old concrete, you need to understand how difficult it will be to remove them. It is not uncommon for damage to the floor to be uncovered and require considerable effort to remove.
  • The floor before sanding must be checked for flatness. If height differences are detected, the intensity of treatment should be increased.
  • You should also pay attention to the expansion joints and check the surface for cracks. If they are present, you will have to add to the list of works also the sealing of problem areas with their subsequent sanding.
  • Concrete floor before the work is worth a test to determine how strong it is. sometimes it sags, and as a result of construction has to be rebuilt.
  • Immediately before the work to check the availability and quality of voltage in the network. if there are interruptions with electricity or weak current is worth postponing the processing or to take steps to stabilize the power supply.
  • If you find joints in the concrete or gaps between the plinth and the coating need to seal them. construction standards prohibit sanding before such defects are eliminated.
  • It is also advisable to check the floor in advance for rigidity, which is sufficient to pass on one section with a grinder.

Pouring the rough floor of concrete with your own hands

For pouring the rough base concrete is used on the basis of cement grade 400 and river sand in the proportion of 1:3. Before mixing the concrete, the sand should be carefully sieved. The presence of large pieces can lead to uneven laying of the material and the formation of cracks.

Before starting work on the surface of the floor, beams are installed. They can be steel (sold in construction stores) or wooden. As the latter, wooden laths up to 15 mm thick are often used. This option is cheaper, however, after removing the laths you will have to fill in the grooves left after them.

Beacons are set on the mortar, according to the level. Usually the thickness of the initial (rough) layer of concrete is from 60 to 100 mm. The position of the screeds can be adjusted until the mortar has grouted.

After that you can start pouring. With a large area of work, pouring the dome with concrete with your own hands is made in strips no wider than 1 meter. The mortar is mixed in special buckets or concrete mixers. The second option significantly speeds up the process of work and makes concrete of higher quality. If the mortar will be stirred in the bucket, sand and cement are poured into it in the specified proportions and thoroughly mixed with a shovel. Then water is gradually added until the concrete is of a normal consistency. It should not be too thick, but also not liquid. The mortar is stirred until a homogeneous mass, so it was not dry inclusions.

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Apply the mortar in small portions and stretch it over the surface using a rule. After the work is completed, the not fully cured concrete is covered with a polyethylene film. This is done to increase the setting time of the mortar, which contributes to increasing the strength of the concrete. If the work is carried out in dry and hot weather, the concrete must be moistened. The concrete will gain strength within 3-4 days.

The last step will be the pouring of the finishing floor in the garage of concrete with their own hands. The final screed is poured in the same order as the substrate. Since it will experience most mechanical and chemical stresses, it is made stronger. For this purpose, cement milk is added to the concrete. It is a mixture of water, cement and a special plasticizer. It is mixed to the thickness of sour cream. After curing, the floor will be sufficiently strong, but not strong enough to withstand the effects of studded rubber or car care products. To do this, it is necessary to apply a protective layer on the floor coating.

Repair of concrete flooring by grinding

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

If you find a pothole, you need to cut out of the floor damaged part of the coating to a depth of 20 mm, using a disc on a stone with a diamond pointing. After cutting through the edges of the problem area, its contents should be removed with a peorator or chisel. The resulting cavity must be cleared of dust, primed with a penetrating compound and sealed with repair mortar, using a metal trowel.

After that, a small rule or a rail should align the area of the termination flush with the surface of the floor. After seizure of the repair mixture disk on the “angle grinder” need to change to a bowl with an abrasive coating, and gently grind the problem area. It can then be treated with a material identical to the underlying concrete flooring.

If a crack appears 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 fragments of concrete, dust, then primed and filled with a repair solution containing as a filler silica sand. When the mixture sags a little in the excavation, it is worth laying its second layer and smooth it out with a trowel. After the polymerization of the composition the place of the crack should be grinded with an angle grinder in the above manner.

How to sand a concrete floor. look 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 this flooring is confirmed by the absence of frequent repairs and long-term preservation of the attractive appearance.

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