High-strength building mixtures for repairing concrete surfaces. Repairing concrete on the street. Features of MBR repair mixtures

Repair mixtures for concrete are used when we need to eliminate damage to the surface without dismantling and re-filling. Of course, the strength of the structure may decrease somewhat, but still the final condition will be much better than before the repair.

Below we will tell you what mixtures can be used to seal cracks and cracks, how to prepare such products yourself, and what to pay attention to when using them.

General issues regarding repair of concrete structures

Most common injuries

Concrete - pretty durable material, and it is for this reason that it is widely used in construction. However, such surfaces are also subject to wear, so sooner or later they require restoration.

As a rule, in everyday life we ​​encounter either damage to concrete load-bearing structures(foundations, plinths, walls), or with defects in the floor screed.

The most common problems include:

• Dusting - finely dispersed destruction of the surface layer. It occurs as a result of a violation of the filling technology, as well as with a significant intensity of operational loads. Eliminated by applying film-forming compounds - sealings.
• Cracks - formed when exposed to heavy loads on small area, as well as during temperature deformations. In addition, concrete can crack during shrinkage.

Advice!
To avoid the appearance of deformation and shrinkage cracks, it is necessary to take measures at the stage of preparing the structure for pouring concrete.
For this, various damper tapes, expansion joints, etc. are used.

• Footprints mechanical damage- chips, potholes, holes etc. This also includes traces from structural elements - mortgages, beacons, formwork parts.
• Level differences caused by uneven shrinkage of the base.

And if in the latter case it is necessary to carry out a large-scale restoration of almost the entire floor, then if cracks or potholes appear, the concrete repair mixture will help restore the surface.

Types of mixtures

A variety of compounds are used to carry out repair work. Their range is very extensive, but still it can be divided into two groups. The easiest way to analyze the characteristics of materials is by studying the table below:

As for the material, it is widely used for the manufacture of such compositions. non-shrink cement, as well as polymers - epoxy resin and polyurethane. All products in this category are characterized by fairly rapid hardening, which is why they are used for express restoration - when there is no time to wait for a full set.

An additional advantage may be the presence of fiber in the repair mixture - steel or polymer fibers. When hardened, it strengthens the edges of the damaged base, significantly increasing its strength. True, the price of such reinforcing agents will be slightly higher.

Self-production

If you don’t want to spend money on buying branded material, then you can easily make a mixture for repair concrete surfaces with your own hands. Of course, its effectiveness will be somewhat lower, but for household needs she'll do just fine.

To prepare we will need:

• PVA glue or bustylate, diluted with water in a ratio of 1:3.
• Cement – ​​1 part.
• Sand sifted through a fine sieve - 3 parts.

The material is prepared immediately before the start of repairs.

For this:

• Pour the cement-sand mixture into a container with a wide neck.
• Add adhesive suspension to the dry material, gradually mixing the solution by hand. It is important not to overdo it with water - the composition should be quite dense.
• When all the material is in the container, take a drill with a mixer attachment and mix the composition until completely homogeneous. As a rule, three to five minutes are enough for this.

Damage repair method

Preparing the base

Usually, any mixture for repairing concrete surfaces is accompanied by instructions that clearly regulate the process of its use.

• First, we need to inspect the damaged area and roughly estimate the amount of material we will need.
• Then we remove concrete fragments, dust, debris, etc. from the crack. For small defects, you can use a stiff brush, but for significant damage, it is more convenient to clean with sandblasting or high-pressure water jetting.
• To secure the edges, the crack can be deepened 20-50 mm below the line of natural destruction. In the process of bridging cracks, cutting reinforced concrete with diamond wheels is often used, which makes it possible to obtain perfectly smooth edges and eliminate all weakly adherent areas.

Advice!
On longitudinal cracks, experts recommend cutting transverse grooves in increments of about 20 cm for more effective fastening.

• Particular attention should be paid to the reinforcement frame. All metal parts, protruding beyond concrete covering, clean until shiny. Then we apply an anti-corrosion primer to the stripped rods to prevent oxidation of the material during the hydration of the repair mixture.
• If the depth of the defect exceeds 50 mm, then additional reinforcement must be placed into it. The reinforcement is installed in such a way that the metal is subsequently covered with a layer of mortar no thinner than 20 mm.

After completing all this work, we re-dust the area. Then we moisten all surfaces, trying, however, to prevent the accumulation of large drops.

Preparation and application of the composition

The mixture for repairing concrete surfaces, prepared independently, can be applied immediately. And here are the compositions industrial production need to be properly diluted with water.

Only in this case will the material acquire the characteristics necessary for effective joint filling and polymerization:

• As a rule, both flowable and thixotropic mixtures require a relatively small volume of liquid. On average, 120 to 250 ml of water is consumed per 1 kg of dry material.
• Pour cool water in a minimum volume (exact numbers are indicated in the instructions) into a container or concrete mixer. Then add the dry component, gradually mixing the material.

Note!
Manual processing does not provide the desired homogeneity of the product, so you must use an electric mixer.
For small volumes, it is possible to use a drill with a special attachment.

We apply casting agents in this way:

• We install formwork along the perimeter of the restored area. It is advisable that its height be at least 50 mm greater than the planned coverage level.
• Pour the prepared fluid mixture onto the concrete, evenly distributing it from one edge to the other. This sequence of actions will avoid trapping air bubbles.
• Vibratory compaction of the composition is not required in most cases. To remove air pockets at the junction of the surface and the formwork, it is enough to run a metal strip around the perimeter.

We act differently with thixotropic agents:

• We are not recruiting a large number of material onto a spatula or grater.

• We forcefully press the compound into the crack, filling it by 15-25 mm in one pass.
• After waiting some time for the layer to polymerize, we repeat the treatment until the defect is eliminated.
• Smooth the surface with a moistened steel float, trying to mask all protrusions and irregularities. Repeated leveling using the same tool is carried out after the mixture has set, i.e. at least half an hour after application.

To prevent the repair composition from cracking, it must be kept moist for 24 hours, and in hot weather - up to three days or more. To do this, periodically spray the restored area with water from a spray bottle or hose, and then cover it with polyethylene or burlap.

Repair mixtures for concrete are used when we need to eliminate damage to the surface without dismantling and re-filling. Of course, the strength of the structure may decrease somewhat, but still the final condition will be much better than before the repair.

Below we will tell you what mixtures can be used to seal cracks and cracks, how to prepare such products yourself, and what to pay attention to when using them.

Even a heavily damaged surface can be restored using high-quality materials

General repair questions concrete structures Most common injuries

Concrete is a fairly durable material, and it is for this reason that it is widely used in construction. However, such surfaces are also subject to wear, so sooner or later they require restoration.

Photo of the damaged surface

As a rule, in everyday life we ​​encounter either damage to concrete load-bearing structures (foundations, plinths, walls) or defects in the floor screed.

The most common problems include:

• Dusting - finely dispersed destruction of the surface layer. It occurs as a result of a violation of the filling technology, as well as with a significant intensity of operational loads. Eliminated by applying film-forming compounds - sealings.
• Cracks - formed when heavy loads are applied to a small area, as well as due to temperature deformations. In addition, concrete can crack during shrinkage.

Advice!
To avoid the appearance of deformation and shrinkage cracks, it is necessary to take measures at the stage of preparing the structure for pouring concrete.
For this, various damper tapes, expansion joints, etc. are used.

• Traces of mechanical damage - chips, potholes, holes etc. This also includes traces from structural elements - mortgages, beacons, formwork parts.
• Level differences caused by uneven shrinkage of the base.

And if in the latter case it is necessary to carry out a large-scale restoration of almost the entire floor, then if cracks or potholes appear, the concrete repair mixture will help restore the surface.

Concrete floor prepared for renovation

Types of mixtures

A variety of compounds are used to carry out repair work. Their range is very extensive, but still it can be divided into two groups. The easiest way to analyze the characteristics of materials is by studying the table below:

As for the material, non-shrink cement is widely used for the manufacture of such compositions, as well as polymers - epoxy resin and polyurethane. All products in this category are characterized by fairly rapid hardening, which is why they are used for express restoration - when there is no time to wait for the concrete structure to fully gain strength.

Application of bulk mixture

An additional advantage may be the presence of fiber in the repair mixture - steel or polymer fibers. When the product hardens, concrete fiber strengthens the edges of the damaged base, significantly increasing its strength. True, the price of such reinforcing agents will be slightly higher.

Self-production

If you don’t want to spend money on buying branded material, then you can easily make a mixture for repairing concrete surfaces with your own hands. Of course, its efficiency will be somewhat lower, but for domestic needs it is quite suitable.

You can also prepare the product yourself

To prepare we will need:

• PVA glue or bustylate, diluted with water in a ratio of 1:3.
• Cement – ​​1 part.
• Sand sifted through a fine sieve - 3 parts.

The material is prepared immediately before the start of repairs.

For this:

• Pour the cement-sand mixture into a container with a wide neck.
• Add adhesive suspension to the dry material, gradually mixing the solution by hand. It is important not to overdo it with water - the composition should be quite dense.
• When all the material is in the container, take a drill with a mixer attachment and mix the composition until completely homogeneous. As a rule, three to five minutes are enough for this.

Method for eliminating damagePreparing the base

Crack bridging scheme

Usually, any mixture for repairing concrete surfaces is accompanied by instructions that clearly regulate the process of its use.

• First, we need to inspect the damaged area and roughly estimate the amount of material we will need.
• Then we remove concrete fragments, dust, debris, etc. from the crack. For small defects, you can use a stiff brush, but for significant damage, it is more convenient to clean with sandblasting or high-pressure water jetting.
• To secure the edges, the crack can be deepened 20-50 mm below the line of natural destruction. In the process of bridging cracks, cutting reinforced concrete with diamond wheels is often used, which makes it possible to obtain perfectly smooth edges and eliminate all weakly adherent areas.

In some cases, it is used to remove damaged parts. diamond drilling holes in concrete

Advice!
On longitudinal cracks, experts recommend cutting transverse grooves in increments of about 20 cm for more effective fastening.

• Particular attention should be paid to the reinforcement frame. All metal parts protruding beyond the concrete coating are cleaned to a shine. Then we apply an anti-corrosion primer to the stripped rods to prevent oxidation of the material during the hydration of the repair mixture.
• If the depth of the defect exceeds 50 mm, then additional reinforcement must be placed into it. The reinforcement is installed in such a way that the metal is subsequently covered with a layer of mortar no thinner than 20 mm.

After completing all this work, we re-dust the area. Then we moisten all surfaces, trying, however, to prevent the accumulation of large drops.

Preparation and application of the composition

The mixture for repairing concrete surfaces, prepared independently, can be applied immediately. But industrial formulations need to be properly diluted with water.

Only in this case will the material acquire the characteristics necessary for effective joint filling and polymerization:

• As a rule, both flowable and thixotropic mixtures require a relatively small volume of liquid. On average, 120 to 250 ml of water is consumed per 1 kg of dry material.
• Pour cool water in a minimum volume (exact numbers are indicated in the instructions) into a container or concrete mixer. Then add the dry component, gradually mixing the material.

Note!
Manual processing does not provide the desired homogeneity of the product, so you must use an electric mixer.
For small volumes, it is possible to use a drill with a special attachment.

We apply casting agents in this way:

• We install formwork along the perimeter of the restored area. It is advisable that its height be at least 50 mm greater than the planned coverage level.
• Pour the prepared fluid mixture onto the concrete, evenly distributing it from one edge to the other. This sequence of actions will avoid trapping air bubbles.
• Vibratory compaction of the composition is not required in most cases. To remove air pockets at the junction of the surface and the formwork, it is enough to run a metal strip around the perimeter.

We act differently with thixotropic agents:

• We collect a small amount of material on a spatula or grater.

Filling the defect with a thixotropic non-shrinking solution

• We forcefully press the compound into the crack, filling it by 15-25 mm in one pass.
• After waiting some time for the layer to polymerize, we repeat the treatment until the defect is eliminated.
• Smooth the surface with a moistened steel float, trying to mask all protrusions and irregularities. Repeated leveling using the same tool is carried out after the mixture has set, i.e. at least half an hour after application.

To prevent the repair composition from cracking, it must be kept moist for 24 hours, and in hot weather - up to three days or more. To do this, periodically spray the restored area with water from a spray bottle or hose, and then cover it with polyethylene or burlap.

Grouting the surface

Advice!
It is advisable that during the entire drying period there are no drafts or drafts in the room. sharp changes temperature.

When used optimally, concrete repair mixtures will help restore the surface of almost any structure. Compliance with the rules for preparing the solution and its application makes it possible to preserve mechanical properties surfaces, and in some cases, seriously improve them. The video in this article will help to understand the nuances of the technology for those who plan to do such repairs themselves.

Concrete repair technology often becomes the only effective way With minimal costs restore the coating of building structures, concrete blocks, pillars, flights of stairs, slabs and platforms of knocked down concrete covering at the entrance to the house. Timely restoration of the chipped part of the surface with a special mixture, at a minimum, extends the life of the steps or structure.

Difficulties of the concrete repair process

Concrete repair has to be resorted to in a situation where the reinforcement is exposed, or spilled concrete chips reveal the crushed stone filler of a slab, steps or sidewalk path. In any case, if you do not take urgent measures and repair the concrete, the matter will end in injury or collapse of the building.

Perform regular repairs cement-sand mixture very difficult due to two fundamental qualities of concrete:

• The dense structure of the cement grain practically does not absorb aqueous solutions, so ordinary masonry mixture almost does not stick to concrete;
• A thin layer of repair mixture based on liquid concrete shrinks and peels off, and, as a result, repairs with a conventional solution end with the laid layer crumbling.

Therefore, to restore concrete chips and wear, special repair mixtures for concrete are used. Due to special additives, the repair composition for concrete retains plasticity, strength and high adhesion to the dusty concrete base.

To restore concrete, repair mixtures based on three basic compositions are used:

• Polymer-cement dry and ready-mixes;
• Fiber polymer compounds based on sand, cement and acrylic binder;
• Compositions based on epoxy resins.

Not all repair mixtures are the same, for everyone specific case its composition is used, in the best possible way suitable for restoring original characteristics.

What should be the mixture for repair work?

All high-quality compositions used for repair work with concrete cavities and chips have the same general properties:

• Before laying on concrete, the repair mixture has a high viscosity;
• Thixotropy of the repair composition;
• High fluidity and finely dispersed composition;
• Availability organic matter, removing air microbubbles and effectively wetting dusty surfaces;
• No shrinkage and fastest hardening.

Why can’t you fill a chip or pothole in concrete with masonry cement? sand mortar? It’s possible, most careless builders do this. As a result, if the mixture is too liquid, the repair patch will have severe shrinkage and low strength, and if repairs need to be made on vertical or inclined surfaces, the mixture will simply flow out of the mold.

If you mix a thick solution, the repair mixture will not really stick to the chipped concrete, a lot of air bubbles will remain on the contact surface, and after a couple of months the patch will fall off.

The repair compound must have good thixotropic characteristics. When pouring, this mixture behaves like a liquid pouring agent. cement-sand mortar, used to strengthen the gravel blind area of ​​the foundation. Thanks to special additives The repair mixture penetrates into all microcracks, chips and cavities on the concrete surface. The adhesion of the material to concrete is 2-3 times higher than that of a conventional masonry mixture.

After pouring into the mold, the process of self-compaction and displacement begins almost immediately. excess water from solution. After a short period of time, the water disappears, and the repair patch turns into a dense and at the same time viscous mixture, securely held on the damaged area.

Materials for repairing concrete surfaces

Majority repair mixtures available on the market to the average buyer can be divided into four main categories:

• Materials for the restoration of high-strength loaded concrete structures;
• Repair mixtures with increased resistance to abrasion;
• Insulating compounds, in addition to restoring the lost part of the surface, the mixture must reliably protect internal structure from penetration of moisture and air;
• Universal sandy cement compositions, used to repair minor damage and manufacturing defects.

The price of repair materials directly depends on its composition. The most expensive two-component ready-made masses based on epoxy resins can cost several thousand rubles per package. Whereas the repair mixture for concrete Ceresit 83 costs 500-700 rubles. per package of 25 kg.

Repair mixtures Ceresit

The most famous repair mixture is rightfully considered the ready-made mass of Ceresit 83. It is the product Knauf company Most often, chipped and crumbling parts of porch platforms, steps, flights of stairs, canopies and parts of balconies are repaired. Ceresit TsN 83 is recommended for repair work on unloaded concrete structures and pouring floor screeds. Ceresite can be used to fill damaged concrete only in cases where the destruction process is blocked and stopped, and there are no signs of the development of cracks and chips.

The material is produced on the basis of fine sand, high-strength cement and water-dispersed polymer additives.

Before laying the repair mixture, the concrete surface must first be cleaned of any dirt, traces of paint and oil. If there are cracks on the surface to be repaired, they must be expanded and cleaned of dust with a stream of compressed air.

In the case of repair work on chips of especially dense concrete, it is recommended to first prime the surface with a mixture in the following proportion: 1 part CH 17, 3 parts water and 5 parts CH 83. The patch can be stepped on after just six hours, complete curing occurs after three days.

Mixture for repair work Penetron M500 Skrepa

From dry repair mixtures Russian production we can highlight the products of the company Penetron "Skrepa". The recipe for preparing a dry mixture for repair work on concrete includes:

• Fine quartz sand, which has undergone special processing;
• High-strength Portland cement M500 with especially fine grain;
• Polymer additives that improve the fluidity of the repair mixture;
• Mineral fiber fibre.

The dry powder is mixed with water in the following proportions: 170 ml of water per 1 kg of mixture. The material is prepared and laid at a temperature not lower than +5 o C. Before pouring the repair mixture onto damaged areas of concrete, the surface is washed and saturated with water to the maximum achievable limit.

At an optimal consumption of 1.8 kg per square, a layer thickness of 1 mm is achieved. In one installation, a repair patch with a thickness of 5 to 35 mm can be formed. Next layer can be laid in just four hours. Hardening time to touch is 10 minutes, setting with a set of preliminary strength levels is 120-150 minutes, depending on the air temperature.

After 28 days, the repair patch acquires a water resistance rating of W14, with a strength of 50 MPa and adhesion of 1.3 MPa.

Mixtures for repair work of the Parad brand

For situations where you need to perform renovation work urgently, we can suggest the use of concrete mixtures produced by the Belarusian company Parad. The manufacturer positions its products as effective material for execution winter work, repair composition of the Parad RS 516 brand is laid at an air temperature not lower than – 5 o C, with a layer thickness of up to 60 mm.

The first and main advantage of the Belarusian cement-sand “repairer” is high speed adhesion and enormous strength of the poured patch. After just 24 hours, the static strength of the concreting layer is 20 MPa, after a month the strength increases to 70 MPa, with frost resistance class F200.

For your information! Despite the significant number of additives and solution delamination stabilizers, PC516 is allowed to be used for casting and repairing drinking water tanks.

The scope of application of PC516 covers the entire range of repairs of building structures made of concrete, starting from pouring building foundations, concreting anchors, driving joints of prefabricated structures, hydraulic engineering and road structures. According to reviews from road services, PC516 is successfully used for high-quality patching repairs of asphalt concrete roads.

The only drawback is it high price, not less than 4000 rub. per package of 25 kg.

Imported repair mixtures

To repair complex concrete structures subject to significant deformations and deflections, high-strength patches made of cement-polymer mixtures filled with elastic metal fiber are most often used. For example, the highly thixotropic mass Mapegrout MF, produced by the Italian company Mapei, can be used.

The repair material is used primarily for restoring vertical concrete surfaces without additional formwork and shotcrete. Italian concrete, even after complete curing, retains high ductility, so there is no danger of developing fatigue stresses and the patch rebounding from the base.

Mapei products can be used to repair even reinforcement exposed from under concrete. Provided that the degree of corrosion damage is no more than 15% of the exposed metal.

The price per package is 1300-1500 rubles.

For less loaded building structures made of concrete, you can use cement-sand mass Vimacret, produced by the Greek company Vimatec. The strength and wear resistance of the hardened patch approximately corresponds to the characteristics of Ceresit 83, but its ductility and moisture resistance are not inferior to PC516 and Mapegrout.

The use of Vimacret is aimed at constructing water pipelines and sanitary hydraulic structures. Distinctive feature The material is its resistance to the formation of fine hairline cracks. Vimacret is used to successfully cast tanks and water pipes, repair slabs and voids in castings, plaster and baseboards in entrances, and glue cladding and tiles on porch steps.

Practice of using repair mixtures for concrete

Proper use of repair compounds for concrete requires the fulfillment of three conditions:

The material can be applied by pouring with obligatory compaction with a vibrator or by gunning the surface using a manual apparatus. When carrying out restoration work on vertical and ceiling surfaces, the excess consumption of the mixture increases by 20-30%.

Conclusion

The use of repair mixtures for concrete allows you to solve two complex problems at the same time - restore the load-bearing capacity of concrete structures and save huge amounts of money on their major renovation. Most patches installed in compliance with repair technology can last at least 30-40 years.

No area of ​​construction can do without concrete. This material is highly durable, reliable and durable, so no replacement has yet been found for it. However, even the most durable concrete structures deteriorate over time. And there can be many reasons for the formation of cracks, chips and other defects. This includes the influence of the environment and mechanical influences, violation of the technology of mixing the main elements of the solution, loads, and the like.

To restore the original properties of the material, repair mixtures for concrete are used.

Peculiarities

After creating mixtures for concrete reconstruction, builders no longer needed to completely replace deformed areas. Now, thanks to special repair substances, you can avoid spending large amounts of money and time on restoring the original parameters of the concrete system. With the help of restorative mixtures, a defective product becomes attractive appearance and returns its original properties.

The composition of the repair connections is designed in such a way that concrete base and the mixture itself reliably adhere to each other. After they have completely hardened, you don’t have to worry that the updated system will soon become unusable. High-quality repair mixtures from famous manufacturers do not need quick replacement, since they differ in a number of positive properties.

Among them:

• frost resistance;
• resistance to sudden decreases and increases in temperature;
• vapor permeability;
• long service period;
• high level of adhesion;
• antiseptic abilities;
• water repellent capabilities.

Indications for use

The repair mixture is used if a large number of cracks, potholes and other defects appear on the concrete surface, which are opened by 0.3 mm or more. In addition, almost all concrete structures are characterized by increased dust formation, this fact is also an indicator for the use of a repair composition.

Concrete structures can be covered with voids, suffer from rust, and a variety of defects can form on them. All these points serve as a reason for using a restorative composition.

Classification

In most cases, repair mixtures are sold in powder form, which must be diluted with water before use. Some manufacturers add certain components to their products to improve the properties of the concrete base.

Repair substances are classified according to their intended purpose:

1. for the regeneration of concrete systems that are under load, e.g. load-bearing building construction, beams, columns;
2. for reconstruction floor coverings made of concrete;
3. for guard reinforced concrete structures from the appearance of rust.

In addition, there is a division into dry mixes and cast mixes.

Dry mixtures are used to restore the original properties of concrete and strengthen solid structures.

Resistance to the most severe frosts and high strength allow the use this product and for repairing systems that are regularly exposed to negative impact natural phenomena and constant loads.

Thanks to such parameters as strength and endurance in conditions high humidity, restorative materials are often used to waterproof concrete. The dry material is environmentally friendly and safe for human health, so it can be used for domestic purposes, for example, to restore drinking water containers to their original appearance.

The last criterion determines the division of repair mixtures into industrial and household.

Casting compounds are used to fill cracks and small holes that have been previously cleared of dirt. They expand during pouring, adhere reliably to concrete, and practically do not shrink when hardened. Filling the resulting voids, the solution hermetically closes and seals the damaged area. Horizontal planes are restored using casting mixtures.

Based on the complexity of the initial composition, mixtures are distinguished:

• monocomponent– cement compositions with large and small particles;
• two-component– prepared using synthetic resins;
• multi-component– liquid polymer repair compounds.

Modern market also provides restorative compositions for concrete under limited operating conditions.

Fast-acting mixture for repairing concrete foundations

The name itself suggests that such products quickly dry and harden. As a rule, 30 minutes after pouring, work can be carried out using heavy loading equipment.

These types of mixtures are very helpful when it is necessary to make repairs in as soon as possible. For example, in factory warehouses, where they are constantly moving different loads, and downtime due to forced repairs will be a real disaster. If you need to repair a concrete structure as quickly as possible, but at the same time with high quality, then quick-acting mixtures are the best solution.

Non-shrink repair product

Shrinkage is deformation that occurs as a result of a reduction in the amount of cement stone in concrete mortar. They are formed during the evaporation of water from the adhesive mixture, therefore, than more liquid required for mortar, the deeper the shrinkage will be.

A simple building mixture shrinks up to 5 mm, which in the construction business is considered a fairly large figure. This shrinkage can cause shrinkage cracks to appear.

To prevent premature destruction of the concrete system, non-shrinkage repair material is used.

Thixotropic mixture

This type of repair substances was created specifically for the repair of vertical surfaces and inclined walls. Thanks to design features does not require the use of auxiliary lathing.

The high viscosity of the substance does not allow it to spread beyond the treated area.

Frost-resistant

Can be used in winter period at negative temperatures.

Manufacturers

The modern market is distinguished by a wide range of different restorative compositions for concrete structures that have lost their pristine appearance and characteristics. They differ in composition, functionality, consumption, cost, quantity in the package and, of course, the name of the manufacturer.

Today, several manufacturers are considered the most successful in sales, and, therefore, the highest quality, according to consumers.

Domestic repair mixture Emaco

Used to improve properties concrete products that have minor damage. The components of the company's dry mixes are: fine quartz, polymer additives viscous, non-toxic and absolutely safe for humans. The solution eliminates large and deep cracks from 2 mm to 2 cm formed on concrete foundations.

Emaco repair compounds have increased stability To low temperatures, so they can remove flaws in concrete systems even in winter.

Birss – Russia

The frost resistance of the compositions of this brand allows regenerating work to be carried out at sub-zero temperatures. Recovery Products trademark Birss is durable and waterproof.

Consolid Bars

Worthy representative domestic producers market. The brand's products are ideal for regeneration different systems made of concrete. Does not sag during hardening and adheres firmly to concrete.

Ceresit CN 83

Masonry mixture designed for operation in conditions of high humidity. It does not sag when it hardens. After complete hardening, a coating is formed that is resistant to moisture and low temperatures, all flaws are covered.

Knauf

Perfect option for waterproofing concrete. In addition to leveling the surface, the mixture makes the structure moisture-resistant and vapor-tight. The main advantage of the building material is the absence of toxic components and convenient packaging of 5 kg, which can be used both indoors and outdoors.

Industry

Another representative Russian manufacturers. NC60 repair mortar is a material that can be used to recreate a variety of concrete surfaces.

The advantage of this product is that it is used not only for restoration work, but also for installation work, for example, the construction of buildings on a concrete foundation.

Mapei – Italy

The manufacturer promises easy reconstruction of concrete. Brand solutions shrink a little when they harden, but do not crack; the surfaces for a long time do not wear out. The SW series is used on reinforced concrete products.

Sika produces repair compounds for concrete, buildings and structures of any type, including bridges, pipes, hydraulic structures, residential and public buildings.

Causes of concrete destruction

Despite all its strength, like everyone else Construction Materials, artificial concrete stone subject to destruction under the influence of a number of external factors.

External static and impact impacts can lead to the formation of shells, chips and cracks. Freezing and thawing cycles cause peeling of the outer layers of concrete structures. Corrosion of steel reinforcement caused by exposure to chlorides, carbonation or other factors leads to an increase in internal stresses in protective layer concrete, which in turn causes the formation of cracks and exposure of reinforcement.

In addition, concrete stone is also subject to biological corrosion caused by the activity of microorganisms, fungi, algae and moss.

As a result of all these negative impacts is decreasing load bearing capacity and the service life of the reinforced concrete structure is reduced.

How to choose mixtures for concrete repair

The complex structure and low repairability of concrete place increased demands on compositions for repairing reinforced concrete structures.

Concrete repair compositions must have:

• high mobility to fill all cavities in a defective structure,
• high strength,
• high adhesion even without the use of adhesive compounds,
• high grade for water resistance and frost resistance,
• low shrinkage,
• resistance to carbonation.

All these requirements are met only by specialized repair mortars for the restoration of concrete structures that meet the requirements of GOST R 56378. These materials include one-component cement mortars and corresponding to classes R4 and R3.

Technology for repairing reinforced concrete structures by pouring into formwork

One of the main methods of repairing concrete and reinforced concrete structures with a high degree of destruction - from 40 mm and above - is the method of pouring into formwork.

Before pouring the repair mortar, concrete surfaces should be carefully prepared. Loose, weak and damaged concrete must be removed and solid and rough concrete bases must be moistened. The surface of the formwork is coated with a lubricant that reduces the absorption of moisture from the solution and facilitates its dismantling.

The finished solution is poured into the formwork continuously without the use of vibrators.

Dry mixtures for repairing reinforced concrete structures by pouring into formwork

Sika produces ready-made dry mixes based on cement binders for structural repairs of concrete and reinforced concrete.

designs. Corresponds to class R3 according to GOST R 56378.

One-component cement-based mortar

self-leveling type, designed for structural repair of reinforced concrete

designs. Corresponds to class R4 according to GOST R 56378.

Among the features of structural repair mortars are low shrinkage, the possibility of application by hand and mechanized way, high strength, adhesion and frost resistance.