How to strengthen the screed runs. How to strengthen the concrete screed that cries. The main types of damage can be attributed

Violation of technology in the production of construction and repair work inevitably leads to large or small troubles, which subsequently have to eliminate, spending great efforts and considerable funds. This axiom is fully applied to an incorrectly generated floor screed, as a result of which various defects may appear on the coating. It can crumble, crack and, as the builders say - bout.

If cracks appeared in the floor after work on the screed, then the most simple, and most importantly, not worth the option, will make normal repairs.

How can you close small cracks?

First, after the detection of such a defect, it is necessary to carefully examine the floor and determine the root cause of cracks. The reasons for which this trouble may occur, several. It is a poorly measured coating layer, a steam drying of the applied layer, problems with moisture in the solution - too much or, on the contrary, too little water. Also, the cracks cause the installation of the strip of the edge ribbon, as well as the lack of compensatory seams.

If it turned out that the cracks went due to non-stitched seams, it is necessary to urgently do the seams for shrinkage. The depth of such a shrinking seam should be buried no less than a third of the bases. They should be done in increasing to 5 meters. Seams should be sealed by sealant, which is based on polyurethane.

We can detect crack, especially if they are very thin, they must be expanded, for which you can be laid. The resulting dust in the crack is removed and rebounded it. Close-up such cracks are needed by a non-shrouded material using a conventional staple. Some subtlety - if a tile will be laid on the floor, and the cracks that appeared on the screed are very small, it is not necessary to do anything with them. Larger cracks are close to a special makeup, which is easy to make with your own hands. It includes cement, PVA and water glue. The mixture that will result in mixing must have a liquid consistency so that it can be pouring it into the resulting cracks. After soaring the flooded solutions in the cracks, you can begin all subsequent work, for example, with a coating on the floor.

If the screed of the floor is not wrong, then over time she can collapse: crumble, crack, bone. In this case, it is not necessary to redo it.

It is possible to promote repair screed, which will be a more economical option.

What to close the cracks in the screed?

When cracks appear in the tie of the floor, it is necessary to initially determine the reason for their appearance, and then proceed to eliminate them.

The reasons for the appearance of cracks on the cement screed can be an irregular coating layer, rapid drying, excess, or lack of water in solution, no edge belt or compensation seams.

If the floor screed cracked due to the lack of compensatory seams, then the shrinking seams need to be cut.

In this case, the depth of the cut should be at least a third of the base thickness. The distance between the seams should be within 5 meters. Seaming seams are performed using polyurethane-based sealant.

When cracking appears in them, you can make a stroke, thus expanding it. From the walls of the shroud, it is necessary to remove dust and brew them. For sealing cracks in a floor screed, it is necessary to use a non-shrinkage that is applied to the spatula.

If the trusted on the tie of the floor is minor, and the floor covering will be a tile tile, then they can be ignored.

Cracks in the floor screed must be embedded with a composition of PVA, cement and water glue. All these components are mixed so that the mixture can be pouring into the slot. After that, the solution must be frozen and proceed to laying outdoor coverage.

Burst the screed floor - what to do?

If the band screed burst, then it is mandatory to correct this defect before laying the floor covering.

With a bad seal of the concrete mixture, air cavities may appear in the screed, which cause cracks. In this case, it is necessary to remove the screed to the cavity and fill it with it.

In order to see the cavity, it is necessary to expand the crack. If you have discovered it, then the solution is knocked out with the help of the kirk. The walls of the resulting fossa must be primed, and then it is taken to close with cement mortar.

The composition of the cement mixture, which is to prepare for embedding a cavity, should include one part of the sand and three cement. Before filling the mixture, concrete is mandatory wetted with water.

The seal of the solution after the fill must be sealing by the method of singe. For this purpose, a metal bar is used.

After repairing the floor screed, it is necessary to ensure no high temperature indoors. In order for the cracks appear on it, it is necessary to make a periodic place of laying a cement mixture with water.

Buchit screed - what to do?

If the floor screed is enclosed, it has been done poorly. The reason for the coverage of the screed can be a poor-quality mixture for a screed, no primer on the base, dirty and dusty base, which is used under the screed, etc.

In this case, you need to hit the hammer with a stupid edge. If the mixture is low-quality, then the dent will remain on the site. A screed can bout in the presence of cracks or in their absence.

If the screed is covered with cracks, then you can try to eliminate it. To do this, it is necessary to expand the crack. Next, prepare a very liquid solution from sand and cement.

It will be best to add PVA glue into this solution. Next, the resulting solution is slowly poured into the extended mixture. It is necessary to produce a pouring of the solution in small quantities, giving him to dry in parts.

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In the event that this method did not remove the coverage of the screed, then it must be completely removed and fill. This is quite a cost option. That is why it is necessary to perform a screed on strictly established rules.

Also look useful videos with the advice of a specialist about the screed repair:

glavspec.ru.

It crumble a concrete screed - what to do?

The base of the floor from concrete is widely used, both in industrial and civil engineering. Its use is due to high strength, reliability and durability.

For reinforced concrete slabs, the screed is poured after cleaning and primer surface. Layer thickness 50 - 100 mm. Typically, such a floor cover is arranged in new apartments or houses. On the ground, the screed of concrete is placed on the floors in the basement. First of all, the ground base is trambed, a layer of sand 100 - 150 mm is poured and compacted. Then the sweeping is poured with a thickness of 40 - 50 mm. After a set of necessary strength (about 7 days under normal conditions), a layer of rolling vapor barrier and insulation is put on it. Then mounted frame made of metal mesh. After that, the waterproofing layer is rolled up and the finish concrete screed with a thickness of 50 mm is poured.

Screed on the dividing layer of waterproofing

Suitable for repairing floors in garages, workshops and other rooms, with polluted fat and oil floors. A layer of rolled waterproofing is placed on the surface. It is poured with a concrete screed with a thickness of 50 - 70 mm.

Floating concrete tie

Suitable for the repair of floors over unheated rooms. Layer layer of insulation (mineral wool, foam). A layer of waterproofing is applied to it. Then the frame of a metal mesh is mounted and a concrete base is poured with a thickness of 50 - 70 mm.

Causes of the destruction of a concrete screed

A strong base may crack or completely collapse under the influence of a number of external and internal factors.

Chemical factors

For an unprepared person, it will be difficult to determine the presence of destruction associated with chemical reactions inside the concrete screed. Mainly this problem concerns large industrial and public construction objects.

Important! During the construction, it is better to use concrete having a quality certificate produced by an industrial method. Or stir directly at the site of work, but from proven and high-quality components.

Physical factors

Cycular freezing and thawing process. Characteristic for winter concreting, when, in violation of the fill technology, not all water is involved in the chemical reaction of the concrete mix. Part of the moisture simply freezes. The concrete screed is destroyed because of the water that fell inside. Continuous freezing and thawing leads to the destruction of bonds inside the concrete and the formation of penetrating cracks.
Exposure to high temperatures. With a sharp cooling of the concrete floor, for example, during the extinguishing of the fire, a couple of concrete is formed inside. Long heating can lead to the formation of cracks. This is associated with a different expansion coefficient of reinforcement and concrete. That is, at equal temperatures, their size changes not equally.

Important! Typically, the cracks from overheating are formed in adjacent to the cords or furnaces of concrete floor sections. Also susceptible to cracking meta, where not insulated pipes of hot or cold water supply are passing.

Shrinkage concrete screed. Related to the rapid release of moisture. In hot weather from concrete, water quickly evaporates. This leads to the formation of microcracks and small failures on the surface of the floor.

The overaffect of water in a concrete solution can lead to cracking a few months after filling the screed.

Mechanical factors

Abrasion. Intensive use of the floor surface leads to the destruction of the concrete surface. A characteristic feature of such destruction is the dips with rounded edges, the so-called "blowers" service life depends on the brand of the mixture.
Impact loads. Unlike abrasion, there is a sharp and rapid effect on the concrete surface. As a result, potholes with uneven edges can appear and penetrating cracks.

Destroying floors rarely occur in pure form. Usually cracking or complete destruction of the concrete screed is associated with the complex effect of several reasons.

Methods for preventing the destruction of a concrete tie

Correctly select the brand of concrete depending on the intended operational load. It is important to understand that the floor in the basement and the garage will perceive the different load. For the basement, concrete brand B10 will be suitable. In the premises with a more intense load, it is better to pour the floors of the B12.5 or B15 grade.
Using a durable filler. There are many types of gravel and rubble. Their strength characteristics strongly affect the quality of the concrete mix.
Introduction to a solution of plasticizing or water-repellent additives. Additional chemicals can greatly increase concrete resistance to moisture or mechanical loads. In construction stores you can find such additives. The main thing is to carefully read the instructions and not make a mistake with the proportions.

Important! Excessive dilution of concrete seven chemicals can cause a weakening or complete destruction of the floor surface.

The impregnation of a spilled concrete mix with a special composition for hydrophobic protection.
Mandatory waterproofing of the base before laying concrete to the earth surface. Otherwise, it will sue moisture and gradually collapse.
In the hot time, protecting the concrete screed from rapid evaporation of water. There are two ways:

Closing the entire floor surface with polyethylene film. Once in the knocks open and shed concrete with warm water. Exposure time 7 - 8 days. After that, the film is cleaned.
Protect fresh concrete wood sawdust. "Dedovsky", but a very effective way. The chage is falling asleep with sawdust and shed water twice a day. Exposure time 7 - 8 days.

Preventing the freezing of a concrete screed to a set of necessary strength. To do this, you can knead concrete on warm water. After filling, the surface is covered with polyethylene film. It turns out "warmly", which will allow concrete to dial the necessary strength. Exposure time 3- 4 days.
Isolation of communications. If heating and water supply pipes pass through a concrete screed, then they are isolated. This is done to prevent the cracking of the concrete floor in the places of contact with pipes.
Heat insulating gaskets between concrete floors and a fireplace or stove.
Protection against mechanical effects and abrasion with the help of the finishing coating in the form of ceramic tiles, laminitis, linoleum.
Device seams. Concrete is poured with strips with a width of 1000 mm, a galvanized profile is stacked between them. Due to this, the monolithic concrete surface does not river under the influence of temperature expansion.

Compliance with all technological features when laying and operating a concrete floor will allow to obtain a durable, reliable and durable basis.

Repair of chosel and cracks in a concrete tie

Even observing all the rules on the pouring and operation of the concrete screed, probably the appearance of cracks, chips and chosel. The technology of repairing a concrete surface depends on the type and degree of destruction. But any work with training begins.

Preparatory stage. Repair of a new screed does not require special surface preparation work. It is enough to remove dust and garbage.

The elimination of defects on the old surface begins with the removal of flooring and cleaning the floor from all paints or glue materials. This uses a spatula and a metal brush for metal.

Important! You can accelerate the cleaning by using special grinding nozzles on a drill or perforator. They are sold in any construction store.

Repair of traces from formwork

Often, after dismantling formwork on the floor surface, uneven areas remain. They are wiping with a cement-sand solution or a repair mix for concrete. Before the grout, the surface is dustd and impregnated with ground penetration (concrete contact) or epoxy resin solution.

Repair Sailing

Thyned - this is the destroyed section of the concrete of a cup-shaped form with uneven and plump edges. They are repaired to prevent further destruction of the concrete surface. Stages of repair:

Around each pitch, rectangular rods are made with a grinder with a circle along concrete. The depth was cut slightly more than that of potholes.
The destroyed concrete is removed from the propyl with the help of hammer and chisel. You can also use a perforator with a nozzle in the form of a blade.

Important! If the rebar of the reinforcement is poured, then you need to paint the open area with a soil for metal.

The surface of the potholes are determined from dust and dirt with a conventional flushed brush.
The destroyed area is processed by concrete contact or epoxy soil. This will get the best clutch of the repair mix with concrete.

Important! Soil drying time 45 - 60 minutes.

The primed pothole is filled with a special makeup for repairing concrete surfaces. If it is not possible to purchase it, then the cement-sandy solution is prepared for small elevation.
The mixture is aligned with the level with the old floor. For this, a plaster spatula is used 100 - 150 mm.
After solidification, the repaired area is grouped.

Repair of cracks

It is done immediately after detection. Otherwise, water can fall into cracks and the process of destruction of the concrete screed continue. Stages of elimination:

Small cracks cut through a grinder and a circle on concrete or expanded with a chisel and hammer. This process is called "Frame Extending". More serious areas are fixed completely as potholes.
Dust and construction trash removes with a fluebrush or vacuum cleaner.

Important! You can use an industrial or home hair dryer for cleaning cracks.

The surface of the crack is impregnated with concrete contact or epoxy primer. It takes time for drying 45 - 60 min.
Crackers are filled with a special maintenance solution based on a polymer or epoxy filler.

Important! Not deep 1 - 2 cm. Cracks are filled at a time. More serious destroyed areas are embarrassed in several layers. The thickness of the layer 1 - 2 cm.

After complete drying, the renovated floor surface is polished.

Important! Wide and long cracks can be strengthened by inserts from fittings. Every 300 - 350 mm propelled, perpendicular to the crack. Then, a piece of reinforcement wire is inserted into each and is embedded with a repair solution.

Repair of small cobweb cracks

This type of destruction is not dangerous for the bearing capacity of concrete floor. To eliminate, it is enough to make a liquid cement-sandy solution and sweep the cracked area.

Repair of irregularities

In the course of operation, the "fierce" sections on the concrete floor may appear. They do not lead to the destruction of the entire coating, but create inconvenience when moving on it. Stages of elimination:

With the help of the milling machine, the uneven section cuts into a depth of 10 - 15 mm.
The repaired surface is cleaned of dust and dirt. To do this, use the usual floor brush or broom.
The purified area is grounded with concrete contact or epoxy glue, diluted with solvent in proportion 1 to 10. Drying time 45 - 60 minutes.
The impregnated surface is filled with a solution and smoothed by plaster rules.
After drying, the entire renovated surface is grouped.

Concrete screed overhaul

The methods described above are suitable when no more than 15% of the surface is destroyed. In other cases, the concrete screed overhaul is required. For these purposes there are self-leveling compositions. Stages of work:

The surface of the concrete floor is cleaned of dirt, dust and dissolves.
The screed is grinning with a baccle with a special nozzle.

Important! Grinding the floor does not level the level relative to the horizon, but only removes all small irregularities and bulges.

The base is impregnated with ground penetration. It is applied using a painting roller 250 mm. Drying period 45 - 60 min. After that, re-primer is carried out.
A self-leveling solution is poured. The layer thickness ranges from 50 to 100 mm. To remove air bubbles, the flooded surface is rolled by a needle roller. If there is a need, then the mixture is applied in several layers. Drying the new screed is written on each bag with a dry mixture. But it should be at least 7 days.

To maintain a concrete screed in good condition, it is enough to notice the starting destruction on time, determine the cause and quickly repaired the destroyed section of the floor.

Video Removing Cracks in Screed

meot.ru.

How to strengthen the screed

03.04.2018

Looked, a ravenned uneven screed in a good way to shoot down to the base. And pour on top of the concrete slab new.

However, the best, as you know, the enemy is good. And there is a financial opportunity and time for capital update. In this case, I propose to use the following method of strengthening the screed.

The loose base is diverting (necessarily a construction vacuum cleaner, the broom will not enough. You can use the usual household vacuum cleaner, but note that for its engine, concrete dust is destructive. But if old and not sorry ...)

Ground the soil of deep penetration. Let him dry an hour 3-4 minimum. It is not necessary to delay much too, so that the dust does not appear again. Next stage of reinforcement and preliminary alignment. The floor is put off with a layer of tiled glue. A plastic facade mesh with a cell 5x5 mm is taken into the glue.

As a result, our dull screed is covered with a layer sufficiently durable material. In addition, thanks to the grid, the floor becomes whole again, and not large pieces of screed, separated by cracks.

Finishing equalization spending self-keys. The filled layer of glue is prepared as well. Dust and soil. How to do it, described here.

The presence of tile glue will not allow the solidifying self-keys to tear the weak and loose top layer of the screed. Also, the glue closes the deepest irregularities, which helps the self-sewn to spill a thin layer (as practice shows, 3-5 mm - the optimal height of the layer of self-refined mixture. If somewhere the thickness of the layer is 10-15 mm, there are also cracks. .)

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pro.Batyanya.ru.

Overhaul of concrete floors: strengthening the referenced screed

Popular methods for repairing concrete floors work effectively, provided that the surface of the floor has kept its integrity of at least seventy percent. If a concrete screed is destroyed by more than thirty percent, it makes sense to replace it with a new one.

The fill process itself is quite simple, however, when it should be followed by certain rules. The surface on which the screed will be poured must be absolutely clean. For better adhesion, the mixture with a rough surface must be used the ground mixture. If an increased humidity is observed in the room - preference to primer with water-repellent properties should be given.

After the actions described above, the starting gear is fastened with a small layer (5-10 cm) of a self-leveling composition, from which, with the help of a special needle roller, the air bubbles formed during the fill. It is permissible to apply the second layer of the composition if necessary.

After the screed was flooded, she needs to be given time. For a month, it is not recommended to allow any impact on the coating, because It was during this time period that the flooded layer finally freezes and acquires all inherent properties. However, despite the observance of the technical rules of the fill of concrete floors, after a while there is a need to carry out their repair. Consider the types of damage and repair methods.

Stages of strengthening of a weak concrete floor

Strengthening the screed may be needed if low-quality cement was used during its pouring or on the floor of the floor, high external loads are constantly affected (for example, in the workshops and indoors of industrial type). It is best to disassemble a poor-quality basis and make the fill of the new screed, rather than making the coating on large damaged areas, but it does not always have enough time and money.

Strengthen technology

The first thing in the renewed screed must be drilled by a row of holes having 20 mm in diameter and at a distance of 25 cm from each other. Holes are drilled to the very base. Professional perforators are well coped with such a task, equipped with a special brown with a small angle of inclination of the working groove.

Next, in each hole (in its upper part), drill a support bowl, the depth of which is 30 mm, and the diameter is twice the hole itself. The drilled holes are cleaned of dust and undergo the process of priming, after which skimmed fittings are inserted into them, the diameter of which is ~ 12 mm, and the length is equal to the depth of the opening.

After that, each hole is filled with epoxy solution (risopox 3500) and a filler is added to which quartz sand appears. At the final stage, the surface grinding is carried out until the smooth plane is obtained.

Repair of the covered coating layer

Quite often a screed, during operation, can peel from the draft floor. This is due to the impact on the concrete floor of unevenly distributed loads. Visually see the problem space does not always work. It is possible to detect peeling, if we slightly catch up with a hammer of the entire floor. The detachment zone indicates himself a deaf sound. In addition, it does not rarely, the detachment occurs in the sections of the floor having cracks, of which the cloud of cement dust flies during the clutch. After all parts of the floor are revealed, which require repair, you can proceed to injecting a screed.

The essence of the method is quite simple and does not take much time. In those parts of the floor, where signs of detachment were discovered, the holes, the diameter of which varies in the range from 12 to 20 mm, were drilled at a distance of 250 mm. Then, using a construction syringe, the composition is poured on an epoxy basis. The fill of the mixture is carried out several times, as it absorbs into concrete and filling the voids formed by the peeling process.

The undoubted plus of the described method lies in its speed, because Already the next day, after repair of concrete floors, a protective layer can be applied to the screed.

Crumbling floor screed what to do

Why does the cement screed crumble, what to do?

Arturio77.

4 years ago

Basically, two factors are the wrong composition of the solution, that is, the proportions of cement and the solution turned out not to be strong and the second not a small factor is the rate of drying solution. If you arrange large and constant drafts, then the moisture from the solution evaporates very quickly and the cement does not have time to show its properties on the hitch and turns into ordinary dust, such a solution will constantly peel and it is hard and dangerous to separate further finishing materials. Another cement solution can be simply climbing a little frost, after thawing, the part of the solution into which the ice was put on the mandatory order. If the question belongs only to the screed, then you can pour a stronger one, of course, if the height of the thresholds is allowed. If the screed will completely crumble on large pieces, then, in this case, of course, it is better to completely replace it.

moderator chose this answer as the best.

9 months ago

It is necessary to clarify, for the clarity of the answer, where your screed is located. It can Street - a plot around the house or a vestibule in the bath, a screed in the garage or a screed in the bathroom, etc.

There are several main causes of cracks or separation, erasing the screed:

Poor-quality fillers. Because of the abundance of dust in aggregates or due to the large presence of a small fraction, the values \u200b\u200bof the solution may repeatedly fall. This leads to a decrease in strength, density and in the trace of all other characteristics (moisture resistance, exterminability, frost resistance, etc.). That is why crackers or chips can quickly appear.
Poor-quality cement. When using a depressed cement, poor-quality (bought from someone from the hands), cement in which the hydrotation process began (mild cement katsovers and grains were formed) to fucked the solution in 2, and even 3-4 times.
Added too much plasticizer. With a large turning on the plasticizer, a mixture bundle may occur. With its hardening in a short time (literally 1-2 months later), chips appear, cracks, the screed is peeling.
Similarly, but only with water. With a large addition of water, the solution is obtained porous, very soft. The finished screed will not be able to perceive serious loads. If the screed is outdoors, it will "tear" in the autumn and spring periods.
Incorrect reinforcement. The lack of reinforcement or its insufficiency leads to the fact that the screed cannot perceive the load. Hence the cracks.
Thin layer of concrete. With a small thickness of the screed and significant loads - it will just begin to crack. The example is simple: when 30 mm of concrete is poured in the garages and then drive the dump truck there. It is not surprising that the screed is scattered.
Bad preparation of the base is the lack of a rambling, the construction of a screed over a soft base.
Fast drying process, insufficiency of moisture after filling the mixture or excessive exposure to sunlight.

What to do?

If cracks appeared, the screed crumble, the process of destruction is no longer stopped. This will continue. It is necessary to eradicate the cause, and this is possible only after dismantling the screed and the construction of a new one. Of course, there are options where you can make some decisions. For example, if it is in the courtyard, then on top of the screed can be made of sand from the sand at 20-30 mm to carry out the laying of the paving slabs (as an example).

To avoid the appearance of cracks, consider the possibility of eliminating each of the 8 reasons at the elap of the screed.

Fillers must be clean: without dust, impurities and large inclusions (if sand). Recommended rubble fraction for screeds: 1-5 mm, 5-10 mm, 5-20 mm. Sand is recommended to use a river, seeded - fraction 0.1 - 3 mm.
Cement only buy in large stores or directly from the manufacturer. Look at the date of production. Use cement within 2-3 months after manufacture. Recommended brands of cement M400D20, M400D0, M500D0, M500D20.
Plasticizer Add no more than 2% to the solution. Carefully read the manufacturer's instruction. Usually, the plasticizer is added in the 0.5-1% area. The recommended brand of the solution for screeds is the minimum M250, it is better to classic version - M300.
Contain a water-cement ratio. Recommended by / c - 0.5. One part of the cement, the floor of the water (by weight).
When pouring screeds up to 50 mm, you can rein the reinforcement grids with a diameter of 5-8 mm. It is possible to do with one plane of reinforcement. It is necessary to have it at the bottom of the screed. With a screed thickness of 50-120 mm, it is necessary to increase the armature cross section. When using one plane of reinforcement, the reinforcement is used with a diameter of 8-14 mm. If the reinforcement plane is two (at the top and bottom), then the reinforced grids are 5 mm or 6 mm. With the magnitude of the screed more than 120 mm, it is recommended to use two planes of reinforcement. Minimum reinforcement diameters in grids - 8 mm.
With a slight load on the screed, you can limit the 50 mm concrete (it is relevant to align the floor in the apartments). When filling gallers, yard, floor in the garage, recommended screed thickness 120-180 mm.
Before filling the screed, remove the loose, vegetable ground from the surface. It is necessary to remove it to dense, clay soils. After, the base is aligned. Make a mound from sand, 40-150 mm thick. Throw this stratum, bite it. Align in the "level" again surface. Put the waterfront film or geotextile and only after reinforcement start laying the mixture. This is for the screeds outside the residential area.
Concrete must dry slowly. 2-4 hours after laying the mixture, cover the surface of the screed with a dark film. Water the concrete in the past 3-5 days. Take care of outdoor sun rays.

to favorites Link thank Kim Jong Yun

more than a year ago

The reasons for such behavior of the screed is quite a lot:

Bought cement for weight, the shelf life of cement is an expired (60-m day, after the date of manufacture).

Not the correct proportions during the knee, the screed can burst and with a small amount of cement in the solution and with large.

Too thin screed.

Did not reach the dryer and subjected to the loads.

Under tie warm floors, the screed did not dry, the warm floors turned on.

Dried the screed additionally (forcibly) using heat guns, browsers and so on.

They poured the screed in the not heated room, plus the day, minus at night as a result of a screed instead of drying frozen (water in it) ice hips and crush the screed.

And you need to take actions to repel from a specific reason, cracks on the screed can still be "cured", but if the screed is crushed everywhere, then only dismantling and filling a new screed for all the rules.

It shrins too many cracks on the surface of the screed,

Cold her knuckles of fingers, for sure everywhere a deaf sound, that is, it moved away from the surface. to favorites link thank Svetlana

4 years ago

Cement screed crumble for a number of reasons:

the proportions during the compilation of the solution, a lot of sand;
poor-quality cement;
incorrectly prepared base under the screed.

If the area is defective small, you can read the tie, everything that crepts to remove, process the surface with the soil, dilute the new solution, slightly liquid and make a new thin screed. If the entire floor crepts, you need to completely remove the screed and pour in a new way.

3 years ago

This defect often happens if you mix the sand with cement in advance, especially in warm weather, and do not create it immediately. We already burned on this.

Do you know the answer?

How to strengthen the concrete screed that cries

Buchit screed - what to do?

You will also be interested:

It crumble a concrete screed - what to do?

The base of the floor from concrete is widely used, both in industrial and civil engineering. Its use is due to high strength, reliability and durability.

Screed on the dividing layer of waterproofing

Floating concrete tie

Causes of the destruction of a concrete screed

A strong base may crack or completely collapse under the influence of a number of external and internal factors.

Chemical factors

Physical factors

Cycular freezing and thawing process. Characteristic for winter concreting, when, in violation of the fill technology, not all water is involved in the chemical reaction of the concrete mix. Part of the moisture simply freezes. The concrete screed is destroyed because of the water that fell inside. Continuous freezing and thawing leads to the destruction of bonds inside the concrete and the formation of penetrating cracks.
Exposure to high temperatures. With a sharp cooling of the concrete floor, for example, during the extinguishing of the fire, a couple of concrete is formed inside. Long heating can lead to the formation of cracks. This is associated with a different expansion coefficient of reinforcement and concrete. That is, at equal temperatures, their size changes not equally.

Shrinkage concrete screed. Related to the rapid release of moisture. In hot weather from concrete, water quickly evaporates. This leads to the formation of microcracks and small failures on the surface of the floor.

The overaffect of water in a concrete solution can lead to cracking a few months after filling the screed.

Mechanical factors

Abrasion. Intensive use of the floor surface leads to the destruction of the concrete surface. A characteristic feature of such destruction is the dips with rounded edges, the so-called "blowers" service life depends on the brand of the mixture.
Impact loads. Unlike abrasion, there is a sharp and rapid effect on the concrete surface. As a result, potholes with uneven edges can appear and penetrating cracks.

Destroying floors rarely occur in pure form. Usually cracking or complete destruction of the concrete screed is associated with the complex effect of several reasons.

Methods for preventing the destruction of a concrete tie

Correctly select the brand of concrete depending on the intended operational load. It is important to understand that the floor in the basement and the garage will perceive the different load. For the basement, concrete brand B10 will be suitable. In the premises with a more intense load, it is better to pour the floors of the B12.5 or B15 grade.
Using a durable filler. There are many types of gravel and rubble. Their strength characteristics strongly affect the quality of the concrete mix.
Introduction to a solution of plasticizing or water-repellent additives. Additional chemicals can greatly increase concrete resistance to moisture or mechanical loads. In construction stores you can find such additives. The main thing is to carefully read the instructions and not make a mistake with the proportions.

Important! Excessive dilution of concrete seven chemicals can cause a weakening or complete destruction of the floor surface.

The impregnation of a spilled concrete mix with a special composition for hydrophobic protection.
Mandatory waterproofing of the base before laying concrete to the earth surface. Otherwise, it will sue moisture and gradually collapse.
In the hot time, protecting the concrete screed from rapid evaporation of water. There are two ways:

Closing the entire floor surface with polyethylene film. Once in the knocks open and shed concrete with warm water. Exposure time 7 - 8 days. After that, the film is cleaned.
Protect fresh concrete wood sawdust. "Dedovsky", but a very effective way. The chage is falling asleep with sawdust and shed water twice a day. Exposure time 7 - 8 days.

Preventing the freezing of a concrete screed to a set of necessary strength. To do this, you can knead concrete on warm water. After filling, the surface is covered with polyethylene film. It turns out "warmly", which will allow concrete to dial the necessary strength. Exposure time 3- 4 days.
Isolation of communications. If heating and water supply pipes pass through a concrete screed, then they are isolated. This is done to prevent the cracking of the concrete floor in the places of contact with pipes.
Heat insulating gaskets between concrete floors and a fireplace or stove.
Protection against mechanical effects and abrasion with the help of the finishing coating in the form of ceramic tiles, laminitis, linoleum.
Device seams. Concrete is poured with strips with a width of 1000 mm, a galvanized profile is stacked between them. Due to this, the monolithic concrete surface does not river under the influence of temperature expansion.

Compliance with all technological features when laying and operating a concrete floor will allow to obtain a durable, reliable and durable basis.

Repair of chosel and cracks in a concrete tie

Preparatory stage. Repair of a new screed does not require special surface preparation work. It is enough to remove dust and garbage.

The elimination of defects on the old surface begins with the removal of flooring and cleaning the floor from all paints or glue materials. This uses a spatula and a metal brush for metal.

Important! You can accelerate the cleaning by using special grinding nozzles on a drill or perforator. They are sold in any construction store.

Repair of traces from formwork

Repair Sailing

Thyned - this is the destroyed section of the concrete of a cup-shaped form with uneven and plump edges. They are repaired to prevent further destruction of the concrete surface. Stages of repair:

Around each pitch, rectangular rods are made with a grinder with a circle along concrete. The depth was cut slightly more than that of potholes.
The destroyed concrete is removed from the propyl with the help of hammer and chisel. You can also use a perforator with a nozzle in the form of a blade.

Important! If the rebar of the reinforcement is poured, then you need to paint the open area with a soil for metal.

The surface of the potholes are determined from dust and dirt with a conventional flushed brush.
The destroyed area is processed by concrete contact or epoxy soil. This will get the best clutch of the repair mix with concrete.

Important! Soil drying time 45 - 60 minutes.

The primed pothole is filled with a special makeup for repairing concrete surfaces. If it is not possible to purchase it, then the cement-sandy solution is prepared for small elevation.
The mixture is aligned with the level with the old floor. For this, a plaster spatula is used 100 - 150 mm.
After solidification, the repaired area is grouped.

Repair of cracks

It is done immediately after detection. Otherwise, water can fall into cracks and the process of destruction of the concrete screed continue. Stages of elimination:

Small cracks cut through a grinder and a circle on concrete or expanded with a chisel and hammer. This process is called "Frame Extending". More serious areas are fixed completely as potholes.
Dust and construction trash removes with a fluebrush or vacuum cleaner.

Important! You can use an industrial or home hair dryer for cleaning cracks.

The surface of the crack is impregnated with concrete contact or epoxy primer. It takes time for drying 45 - 60 min.
Crackers are filled with a special maintenance solution based on a polymer or epoxy filler.

Important! Not deep 1 - 2 cm. Cracks are filled at a time. More serious destroyed areas are embarrassed in several layers. The thickness of the layer 1 - 2 cm.

After complete drying, the renovated floor surface is polished.

Repair of small cobweb cracks

This type of destruction is not dangerous for the bearing capacity of concrete floor. To eliminate, it is enough to make a liquid cement-sandy solution and sweep the cracked area.

Repair of irregularities

With the help of the milling machine, the uneven section cuts into a depth of 10 - 15 mm.
The repaired surface is cleaned of dust and dirt. To do this, use the usual floor brush or broom.
The purified area is grounded with concrete contact or epoxy glue, diluted with solvent in proportion 1 to 10. Drying time 45 - 60 minutes.
The impregnated surface is filled with a solution and smoothed by plaster rules.
After drying, the entire renovated surface is grouped.

Concrete screed overhaul

The surface of the concrete floor is cleaned of dirt, dust and dissolves.
The screed is grinning with a baccle with a special nozzle.

Important! Grinding the floor does not level the level relative to the horizon, but only removes all small irregularities and bulges.

The base is impregnated with ground penetration. It is applied using a painting roller 250 mm. Drying period 45 - 60 min. After that, re-primer is carried out.
A self-leveling solution is poured. The layer thickness ranges from 50 to 100 mm. To remove air bubbles, the flooded surface is rolled by a needle roller. If there is a need, then the mixture is applied in several layers. Drying the new screed is written on each bag with a dry mixture. But it should be at least 7 days.

To maintain a concrete screed in good condition, it is enough to notice the starting destruction on time, determine the cause and quickly repaired the destroyed section of the floor.

Video Removing Cracks in Screed

How to strengthen the screed

03.04.2015

Looked, a ravenned uneven screed in a good way to shoot down to the base. And pour on top of the concrete slab new.

However, the best, as you know, the enemy is good. And there is a financial opportunity and time for capital update. In this case, I propose to use the following method of strengthening the screed.

Finishing equalization spending self-keys. The filled layer of glue is prepared as well. Dust and soil. How to do it, described here.

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Overhaul of concrete floors: strengthening the referenced screed

Stages of strengthening of a weak concrete floor

Strengthen technology

Repair of the covered coating layer

The undoubted plus of the described method lies in its speed, because Already the next day, after repair of concrete floors, a protective layer can be applied to the screed.

vest-Beton.ru.

How to strengthen the screed that lifts, and how to make cracks? I burst or enclosed the floor screed - what to do?

How to strengthen the screed that lies?

If the screed of the floor is not pronounced, then over time it can destroy. crumble, crack, bang. In this case, it is not necessary to redo it.

You can promo repair the screed. What will be a more economical option.

What to close the cracks in the screed?

When cracks appear in a floor screed, it is necessary to initially determine the reason for their appearance. And then proceed to their elimination.

The reasons for the appearance of cracks on the cement screed can be an irregular coating layer, rapid drying, excess, or lack of water in solution, no edge belt or compensation seams.

If the floor screed cracked due to the lack of compensatory seams, then the shrinking seams need to be cut.

When cracking appears in them, you can make a stroke, thus expanding it. From the walls of the shroud, it is necessary to remove dust and brew them. For sealing cracks in the tie of the floor, it is necessary to use a non-shrinkage. which is applied to the spatula.

If the trusted on the tie of the floor is minor, and the floor covering will be a tile tile, then they can be ignored.

Burst the screed floor - what to do?

If the band screed burst, then it is mandatory to correct this defect before laying the floor covering.

With a bad seal of the concrete mixture, air cavities may appear in the screed, which cause cracks. In this case, it is necessary to remove the screed to the cavity and fill it with it.

The seal of the solution after the fill must be sealing by the method of singe. For this purpose, a metal bar is used.

Buchit screed - what to do?

In this case, you need to hit the hammer with a stupid edge. If the mixture is low-quality, then the dent will remain on the site. A screed can bout in the presence of cracks or in their absence.

If the screed is covered with cracks, then you can try to eliminate it. To do this, it is necessary to expand the crack. Next, prepare a very liquid solution from sand and cement.

It will be best to add glue na to this solution. Next, the resulting solution is slowly poured into the extended mixture. It is necessary to produce a pouring of the solution in small quantities, giving him to dry in parts.

You will also be interested:

Also look useful videos with the advice of a specialist about the screed repair:

According to the site: http://glavspec.ru

fix-Builder.ru.

Screed lifted how to strengthen?

The content of the article:

If cracks appeared in the floor after work on the screed, then the most simple, and most importantly, not worth the option, will make normal repairs.

How can you close small cracks?

What if the screed burst?

A bursting screed, a serious defect that requires a mandatory elimination. The cause of such a big trouble may be unsatisfactory sealing of the mixture, as a result of which air cavities can be formed - cavities, leading to cracking on a large scale. In this case, the screed is removed to the discovered empty cavity, and the cavity is poured with a solution. Detect the cavity you can deepen the crack with a tool, for example, kirk. Accordingly, the trial pit must be subsequently covered with soil and pour the solution. The solution with which the cavity is poured must be sand and cement in the ratio one to three. Before the fill, the cavity is wetted with water. After the cavity is flooded, it is necessary to make sure the qualitative of fillings, for which it is to try to compact the hole using the appropriate bar. The room temperature should not be too high. The screed must be periodically moistened using water.

Screed off - how to deal with it?

Experts apply the word "enclosure" in cases when when attacking a screed there is a feeling that there is emptiness in the depths of the coating. Also, this term is used when the springs effect occurs under the foot, some surface toaling. If the screed is enclosed, there can be a lot of reasons for this. The main reason is non-compliance with the process technology. When the signs are found, it is necessary to break through this place, expand it and pour into a liquid solution, which consists of cement and sand. The optimal solution will add PVA glue into the solution. Here there are subtlety - it is necessary to pour a solution with small portions, allowing the opportunity to frozen each of them. If this method did not help, then we go according to the "scorched land" method - we break the screed and begin all over again. To prevent this - do everything right and technology immediately.

fortStroi.com.ua.

Repair of news tie: independent production

Read in this publication: Repair of floor screed: It is advisable to make a cement bandwidth of the floor: Preparatory workAcake Repair Paul's screed: the main stage of the work

The crashing or folded screed is not only an uneven and not comfortable floor, but also a unallocated load on the slab overlap in the house. If with the first time you can more or less put up, then with the second case, there are somewhat different - excessive loads on overlap, despite the fact that they have a fairness of safety, may be catastrophic, especially if we are talking about old houses. The screed must be kept in order - in the case of overhaul to change or at least repair. In this article, from the site of Stroisovety.org, we will deal with the question, how is the repair of the floor tie do it yourself?

Repair of a cement tie photo photo

Repair of a tie of the floor: about its expediency

Before you begin to directly solve the issue, how to make the repair of the floor tie with your own hands, to begin with, it is necessary to deal with its expediency - perhaps things are so that there is no point in it, and it is not necessary for the restoration of the surface, but its complete replacement. In which situations there is a need for a device of a new floor tie? Symptoms saying that the screed has already dialed their century, not so much.

By and large, any specific criteria, according to which it is necessary to fully change the floor screed, no. There are just prescriptions and common sense, which suggests that the new surface is better than the old one. She will be able to live for a long time, and if you intend to live in an apartment or a house for a long time, then the best replacement of this surface will be best - naturally, if we are talking about overhaul. It is better to spend once on a new screed than with enviable regularity to repair the old floor tie. Recovery is primarily a temporary measure that solves the question of a short period of time.

Cement screed repair: Preparatory work

Preparation of an old screed to repair - the case is simple, and in most cases it comes down only to two actions.

Drying the second layer of primer can not wait - while you prepare the solution, it absorbs into the old screed and it will be enough. Such a repair of cracks in the tie of the floor (and rather the preparatory work related to its conduct will give you a guarantee that the foundation of the floor will serve at least ten years.

How to repair a light tie: the main stage of work

This stage (as, in general, and preparatory) can be divided into two sub-pay - fastening the split fragments of the floor and the finishing level alignment. These are two different technologies that should be dealt with separately.

In principle, this is the entire repair of the floor tie. It seems not difficult, but there are plenty of nuances - they are not clear. It can be said that the subtleties are almost all individual. For example, depending on the degree of destruction of the old floor screed, it may be necessary reinforcement - naturally, such a floor covering is better to change the whole, but there are different situations and even for large destruction, the repair may be appropriate.

stroisovety.org.

How to strengthen the screed that lifts, and how to make cracks? I burst or enclosed the floor screed - what to do?

How to strengthen the screed that lies?

If the screed of the floor is not wrong, then over time she can collapse: crumble, crack, bone. In this case, it is not necessary to redo it.

It is possible to promote repair screed, which will be a more economical option.

What to close the cracks in the screed?

When cracks appear in the tie of the floor, it is necessary to initially determine the reason for their appearance, and then proceed to eliminate them.

The reasons for the appearance of cracks on the cement screed can be an irregular coating layer, rapid drying, excess, or lack of water in solution, no edge belt or compensation seams.

If the floor screed cracked due to the lack of compensatory seams, then the shrinking seams need to be cut.

If the trusted on the tie of the floor is minor, and the floor covering will be a tile tile, then they can be ignored.

Burst the screed floor - what to do?

If the band screed burst, then it is mandatory to correct this defect before laying the floor covering.

With a bad seal of the concrete mixture, air cavities may appear in the screed, which cause cracks. In this case, it is necessary to remove the screed to the cavity and fill it with it.

The seal of the solution after the fill must be sealing by the method of singe. For this purpose, a metal bar is used.

Buchit screed - what to do?

In this case, you need to hit the hammer with a stupid edge. If the mixture is low-quality, then the dent will remain on the site. A screed can bout in the presence of cracks or in their absence.

If the screed is covered with cracks, then you can try to eliminate it. To do this, it is necessary to expand the crack. Next, prepare a very liquid solution from sand and cement.

You will also be interested:

Also look useful with the advice of a specialist about the screed repair:

http://glavspec.ru.

legkoe-Delo.ru.

Screed floor what to do if it lifts

Articles

When cracks appear in the tie of the floor, it is necessary to initially determine the reason for their appearance, and then proceed to eliminate them.

The reasons for the appearance of cracks on the cement screed can be an irregular coating layer, rapid drying, excess, or lack of water in solution, no edge belt or compensation seams.

If the floor screed cracked due to the lack of compensatory seams, then the shrinking seams need to be cut.

Floor repair (bursting, bounced, bing tie)

cement screed after treatment with liquid glass

If the trusted on the tie of the floor is minor, and the floor covering will be a tile tile, then they can be ignored.

If the band screed burst, then it is mandatory to correct this defect before laying the floor covering.

With a bad seal of the concrete mixture, air cavities may appear in the screed, which cause cracks. In this case, it is necessary to remove the screed to the cavity and fill it with it.

The seal of the solution after the fill must be sealing by the method of singe. For this purpose, a metal bar is used.

In this case, you need to hit the hammer with a stupid edge. If the mixture is low-quality, then the dent will remain on the site. A screed can bout in the presence of cracks or in their absence.

If the screed is covered with cracks, then you can try to eliminate it. To do this, it is necessary to expand the crack. Next, prepare a very liquid solution from sand and cement.

You will also be interested:

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What does the construction of any object begins? Naturally, from the foundation bookmark. To create a good solid base, concrete is needed. It is he is one of the most popular and inexpensive building materials. But the quality of the components of the concrete mix is \u200b\u200bcurrently not always high, therefore, additional components are needed to extend its service life.

In order to increase the strength of concrete, steel fittings are layered into the design, that is, create a reinforced concrete basis.

There are many ways to strengthen concrete. There are several quite worthy funds in the construction market.

These are special impregnations of various foreign and domestic manufacturers.

And in terms of quality, they are almost the same. The main function of impregnation is to strengthen the concrete mixture for the floor, the scene, the foundation. Without such mixtures, the concrete base has low wear resistance, and if the coating is applied on the street, then cracks appear from the permanent drop of temperature or vibration. The composition is gradually scattered, and the coating is almost unrealistic. Such a decay of the concrete coating occurs in the event that the very cement itself is low quality or during the flow of the solution, the faithful proportions of the components of the concrete material are not observed.

The most effective polymeric or polyurethane impregnation mixtures for hardening concrete composition. When filling the upper layer of the screed with polymer impregnation on its surface, a new, better layer of concrete polymer is formed. The quality of the expected sexual strength will fully depend on how deeply penetrates the strengthening composition. The surface becomes stronger, and, accordingly, the service life of the coating increases. One of the main advantages of strengthening impregnations is the possibility of applying them to the surface at air temperature to -30 degrees.

Application of additives

Scheme of the experimental installation of the impregnation of porous concrete with liquid radioactive waste: 1-container with porous concrete; 2-probe; 3-pump; 4 pressure gauge; 5-capacity-repository LRR; 6-protective box; 7-pipe.

after you have purchased a strengthening screed, you must prepare the surface. Concrete has already been inflicted with the standard way should be even and necessarily wet. Application of impregnation on the frozen dry tie is not allowed;
dry strengthening mixture is applied to a wet screed with a flat layer. After that, it immediately begins to interact with the surface layer of the floor. The result of the action produced will be resistant to chemical and mechanical exposure flooring. If the screed is on the street, the impregnation will protect it from the effects of sunlight. From the point of view of aesthetic qualities, the appearance of the floor becomes much more attractive;
when concrete is strengthened in industrial and industrial premises, where the surface area is large large, additional construction tools are used: grinding machine, distribution cart and seam cutter. They are necessary for a faster processing of a wet concrete layer;
using a complementary mixture, you can create a room decor. Modern manufacturers take into account this fact and produce strengthening compositions of various colors. At the same time, the main technological qualities of impregnations are not reduced, but increase. Colored formulations protect any concrete coating not only from mechanical exposure, but also reduce dust formation. Such mixtures are used in trading halls and in warehouses.

Types of impregnations

Currently, impregnations made with the use of polyurethane materials are most popular. Modern technologies allow them to produce them for a concrete coating located in any room or on the street.

If the basis of the future surface is the soil, then the tie of concrete and floors can be carried out by impregnation for the brand of concrete M150-M350. This composition allows you to impregnate a layer of a depth of 3 mm. In this case, the concrete itself in the upper layer becomes strength similar to the M600 brand. The surface will be more resistant to dust formation, and the base is tight.

Repair scheme of concrete defects with latch of reinforcement: A - concrete defect with latch of reinforcement; b - removal of the destroyed concrete, applying the protective layer to the reinforcement; B - restored construction site. 1 - construction structure; 2 - Armature; 3 - Material "KTTRON-primer"; 4 - repair material "KTTRON" thixotropic (depending on the project).

The biggest advantage when using polyurethane streams is their ability to increase the chemical resistance of concrete coating. For example, the floor with such impregnation serves for many decades and does not require additional effort during cleaning. They are easily clean with ordinary detergents.

There is another option impregnation with a deeper penetration. It is intended for M300 brand concrete. The composition used penetrates the floor to a depth of 5 mm. When applying this mixture it is necessary that the ambient air temperature is from +5 degrees. The reinforcing mixture of deep penetration is usually used for floors with a weak layer of concrete M150. When working with this composition, for maximum hardening, the floor with an already applied impregnation should be covered with polyethylene film. In this case, the impregnation will enter the floors much deeper. The technology of manufacturing impregnation with deep penetration allows it to be used for high-strength concrete bases and wet bases.

In addition to polymer impregnations, there are other varieties, more modest in cost. This is a fluid impregnation. Despite the low value of the material, it does not differ from the polymer counterparts with its qualities. The strength of the concrete coating increases to 50%, and the appearance of the floor does not change and pleases the eye. In addition, after applying this impregnation, a film is not formed on the surface of the floors. All types of strengthening mixtures are able to reduce dust formation in the room.

Strengthening large volumes of concrete

If a task is to strengthen the more powerful volume of concrete for large areas, the complex of different modifiers should be applied. They are mainly used in the construction of large high-strength facilities to strengthen concrete. Additives are entered into the commodity concrete mass. They help the concrete mass reach the brand of strength M700 and higher. In this case, the technical composition of the majority does not change.

So, with the help of strengthening impregnations, you will not only achieve the strength of the floor covering, but also create a unique interior in its premises.

Concrete floors are distinguished by high strength, durability, unpretentiousness, affordable price. But at the same time they have the weaknesses. The most obvious of them is a tendency to destroy the upper layer. On the surface of the concrete floor, cracks appear, potholes and chipsets. To prevent this process, use various concrete strengthening technologies.

Main ways to strengthen concrete floor

Strengthening concrete floors prevents their further destruction and returns to them former performance properties. There are different technologies for strengthening concrete. The specific method is chosen depending on the state and age of the floor.

Currently, to strengthen concrete sex most often use:

grinding;
topping;
special impregnations.

If the concrete screed is manufactured with the addition of granite or marble crumb, then after grinding the floor will also acquire a beautiful, factory figure.

Topping - relatively simple and economical technologyallowing you to get high-strength, damage floors. The surface of the concrete after topping becomes 5 times more wear-resistant and 2-4 times more shockproof. Topping floors are recommended to be used in manufacturing workshops where heavy loading equipment works, in shopping complexes, in garages and parking lots. But such floors are not suitable for premises, where chemical reagents are possible.

For premises with high humidity, special impregnations are more suitable, sealing the structure of concrete. They penetrate deeply inside the concrete, while creating the effect of sealing and sealing the material. The impregnations are widely used to strengthen old and weak screeds, since they allow several times to increase their strength and resistance to abrasive loads.

Grinding concrete

The surface layer of concrete floor does not differ in high strength, so when exposed to mechanical loads, temperature and humidity drops, it begins to crumble, which leads to a reduction in the life of the floor. In addition, the process of maturation of concrete is always accompanied by the output of cement milk to the surface. This milk forms when frozen the extremely continuing layer, which often becomes the main source of formation of cement dust. To prevent dust formation, it is necessary to remove the upper weak layer of concrete and expose the stronger surface. To do this, use the grinding of a concrete floor.

Grinding floors have a number of positive qualities:

high strength and wear resistance. Floors after grinding well tolerate any elevated loads;
chemical inertia. Grinding floors acquire resistance to various technical fluids and chemical solutions;
damility, hygienicness. Concrete floor after grinding ceases to dust, so care is facilitated;
decorativeness. After grinding and subsequent polishing, concrete floors become aesthetically attractive and can be used not only in production, but also in residential premises.

There are different technologies of a polished concrete coating device, so they may consist of different number of stages. The number of these stages depends on many factors, among which the initial state of the concrete gender, and the conditions for the process, and the type of tool used.

In any case, the process includes the following main steps:

preparatory work. At this stage, the concrete base is cleaned of garbage and dust. If there is any floor covering, it must be dismantled, and the surface is to align as much as possible. Next, all existing cracks and chips should be seen;
after preparatory work performed Ground grinding of a concrete surface. To do this, use a diamond tool with graininess of 80 Grit;
after a rough grinding on concrete, impregnation is applied to hardening its surface;
after the impregnation dries, perform a finishing grindingusing the grain tool from 150 to 400 Grit
at the next stage, polishing the floor is carried out. Its surface is communicated to the perfect state with the consistent application of a fine-grained tool, starting with 1000 and ending 3000 Grit;
floor surface after polishing cleans from dust and coated with several layers of polyurethane varnish.

Grinding can act as an independent procedure for strengthening concrete floor or as a preparatory stage before applying strengthening compositions, since it increases the adhesion of the concrete surface to any building mixtures and solutions.

Grinding is used for both fresh floods and old bases.

The first passage along the fresh floor is made no earlier than 6-7 days after the fill of the concrete mix. This is necessary in order to remove the cement milk layer and open a longer layer for better maturation. Finishing grinding is performed no earlier than in a month, that is, after complete maturation of concrete.

Before grinding the old concrete base, its readiness for this procedure first is evaluated. Invalid "weak" sections - looseness, detachment, crumbling. If there are such defects, it is necessary to carry out repair work using epoxy compositions.

More details about the repair of epoxy mastic is described in the article Elimination of concrete defects with epoxy mastic

In the event that the damage occupies more than 30% of the floor area, pour a new screed.

On other methods of repairing concrete gender, the main methods of repairing concrete floor

Benefits of strengthening Topping

Concrete strengthening technology with special dry mixtures (topping) perfectly proven itself when used on various objects, therefore it is now very popular. Topping can be used to strengthen the concrete surface, which will continue to be operated independently or to harden the base for any other flooring. This technology assumes the application of a special dry mixture on the freshly lined concrete concrete and the subsequent grouting with the help of a cloud machine. Alignmenting the blades of this car are pressing Topping into hardening concrete. In this case, a strengthened surface layer is formed.

Concrete floors after strengthening Topping acquire the following advantages:

high strength. After Topping, the M400 brand concrete acquires strength equal to the M800 brand;
the fortified surface acquires the best performance featuresand care for it becomes easier;
topping concrete floors cease to dust and acquire high resistance to the effects of abrasives;
processed concrete acquires antistatic properties;
with topping you can improve concrete decorativenessBy giving it a variety of texture: grain, smooth, mirror.

The main technical parameters of Topping floors are determined by the components of the mixture rubbed. This mixture includes cement, mineral pigments and fillers.

The magnitude of the fractions of the filler is chosen depending on the type of concrete used for filling the floor. When choosing, it is necessary to remember that any shallow fraction filler has the smallest adhesion with a concrete base, therefore the probability of peeling such topping is significantly higher.

The use of a larger fraction gives the floor increased strength, but strongly reduces the plasticity of the mixture.

Depending on the type of filler, the mixture is divided into:

quartz;
corundum;
metallized.

Quartz mixes

The operational and technical properties of quartz strengths make it possible to use them for floors exposed to the extension loads of the average degree. With the help of quartz tops, floors in stores, administrative buildings, in warehouses and in garages with low loads.

About concrete floors on various objects told in articles below

Polished concrete floor in parking and garages

The use of quartz sand as a filler allows you to increase the strength of the concrete floor in one and a half times. The main advantage of quartz topping is an affordable price.

Corundum Topping

Corundum complementors are used in the case when it is necessary to create a particularly stable concrete floor subjected to high loads. The floors reinforced by the corundum mixture can be subjected to elevated abrasive and shock loads daily, but at the same time cracks and other damage will not appear on them.

The corundum crumb used as one of the components of the hardening mixture is particularly durable. With the help of corundum topping, the strength of the concrete floor can be increased 1.7 times. But compared with the quartz mixture, Corundum is more expensive. The price difference is approximately 20-30%.

Metallized Topping

As a filler for this topping, a metal chip is used, which gives it special strength. Metallized Topping is recommended to use for floors experiencing increased loads. These can be floors in the shops of those industrial enterprises that use heavy loaders or in garages intended for heavy machinery.

But it should be borne in mind that the metallized mixtures can not be used in rooms with high humidity, since the floor with such topping will quickly come into disrepair due to the proper metal component. Coupling for the floor under metal Topping should be cast from concrete by a brand not lower than M300. Otherwise, the concrete base quickly cracks.

In more detail about the technology of applying Toping, told in the article Topping Technology

Strengthening concrete with impregnation

The impregnations for concrete are one of the most common ways to strengthen concrete floors. They are a liquid composition on an organic or inorganic basis. Inorganic impregnations are called flucts. After applying, they enter the chemical reaction with the components of concrete. As a result of this reaction, a solid protective film of chemically inactive compounds is formed on the surface of the concrete.

Organic (polymeric) impregnations are considered to be more efficient material to strengthen concrete. When using the upper layer of concrete, the polymer is filled with polymer, so it is modified in a concrete polymer with improved strength characteristics. Moreover, the degree of strength of strength will largely depend on how deep the polymer composition penetrates into a concrete thickness.

Unlike topping, impregnations should be applied to the concrete no earlier than 10-15 days after its fill. The surface of the floor before applying the impregnation must be carefully cleaned and polished to remove the cement milk layer.

The main types of impregnation for concrete

All currently existing strengthening impregnations are divided into:

impregnating fluorates;
polyurethane;
deep penetration.

At the moment, polyurethane impregnations are most popular. The high demand for impregnation of this species is explained by the fact that they allow not only to strengthen the concrete, but also to create additional tightness, dust protection, increase immunity to temperature differences and various chemicals. The depth of the strengthening layer at the same time reaches about 3 mm.

The basic restriction on the use of polyurethane impregnation imposes moisture content of concrete: it should be not more than 5%.

In the case when it takes to strengthen the concrete coating as much as possible, use impregnation of deep penetration. These compositions give concrete floors specifications identical to those purchased using the materials of the first group, but only the latter can also be used in rooms with high humidity.

As a result of treatment with impregnation of deep penetration, the strengthening layer is 5 mm.

The impregnating fluorates are the cheapest materials to strengthen concrete. With their help, it is possible to strengthen the concrete base at least 50%. The main advantage of the use of fluats is low cost.

Depending on the method of action, film and penetrating impregnations are distinguished.

The first form a protective layer on the floor surface, but do not strengthen loose bases.
Penetrating, on the contrary, react with concrete and fasten unstable surfaces.

Penetrating compositions can be used at low temperatures. Their main advantage - relative savings: film impregnations must be periodically updated, and penetrating is applied once.

But it should be noted that the use of penetrating impregnates is useless on low brands of concrete and cement-sand bases. These hardensions in this situation will not give the desired effect. For this reason, film formulations are more popular.

Film strengthening formulations are divided into:

acrylic film coatings, which are used to protect concrete floors, operated with a light and medium degree of load. Floors impregnated with acrylic compositions can be operated without repair no more than 3 years. After this period, the layer must be updated. The main advantages of acrylic impregnates are relative low cost and simplicity of application;
epoxy impregnations allow the concrete floor to protect the concrete floor from strong abrasive and chemical loads, as well as seal a sufficiently loose surface;
polyurethane mixtures are used at maximum loads on the concrete floor. These compositions provide optimal protection in wet premises and allow to extend the operation time of the floor 4-5 times.