What is the best concrete repair mixture? How to repair cracks in concrete What is it?

Concrete is a material used in all areas of construction, the main advantages of which are high strength, reliability and durability. But over time, even concrete structures collapse. There may be several reasons for the appearance of cracks, chips, and deformations: violation of the ratio of elements during mixing, mechanical stress, influence environment, loads, etc. Special mixtures are used to restore the material.

Repair mixtures are used for quick restoration various designs from concrete, restoring them geometric parameters and performance characteristics.

There are two types of repair compounds for concrete:

injection molding;
dry.

Casting mixtures for concrete are used to fill pre-prepared cracks and recesses. They have the ability to expand and a high degree of adhesion to concrete, stone and reinforcement, and when hardened they practically do not shrink. Filling all free space, the solution reliably seals and strengthens the surface being repaired. Casting mixtures are used for the restoration of horizontal surfaces.

Concrete restoration and strengthening monolithic structures also carried out using dry compounds. The high level of frost resistance and strength allows the use of dry mixtures for the repair of products subjected to negative impact natural phenomena and cyclic loads. Thanks to good characteristics and the moisture resistance of the substance that has gained strength, it is often used to waterproof concrete. The material is completely non-toxic, so it is used, for example, to repair drinking water tanks.

Dry formulations are used:

for restoration of load-bearing surfaces, floors, stairs;
for road restoration;
to protect concrete from corrosion.

The listed types are presented on the domestic market in a wide range. The cost depends on their quality, characteristics and manufacturer.

Review of popular manufacturers

The requirements for cast and dry mixtures are as follows:

high degree of adhesion with the restored surface (concrete, stone, reinforcement);
eliminating shrinkage.

Often the main aspect influencing the buyer's choice is the price of the product. Especially if you need to purchase a large batch for concrete repair.

Accept correct solution will help short review popular brands.

"Emaco"

The Russian company Basf manufactures and sells Emako compositions used to repair concrete damage of varying degrees of complexity: from small cracks to complex deformations.

"Emako" N 5100 is used for the first degree of damage: the presence of dirt, cracks, cavities.
Using Emako N 900, N 5200, damage of the second degree is repaired: crumbled or peeled areas of the surface, as well as small chips.
Emaco S 488 PG, S 488, S 5400 cope perfectly with rust and cracks up to 0.2 mm and a depth of no more than 40 mm (third degree).
Cracks larger than 0.2 mm, exposed reinforcement, high level of carbonization - fourth degree, depth up to 100 mm - are restored with Emako compounds T1100 TIX, S 466, S560FR.
Heavily damaged concrete structures with exposed reinforcement and chips more than 200 mm deep are restored using non-shrink (“Emako” A 640) and anti-corrosion (“Emako Nanocrete AP”) mixtures.

You can buy Basf on the company’s official website. The cost varies from 850 to 1,700 rubles per 25 kg package, depending on the components of the composition.

"Birss"

The Birss mixture for restoring concrete foundations is produced in Russia and is intended for repairs of any degree of complexity.

Birss 28, 29, 30, 30N - simple repair of cracks and peeling surfaces.
Birss 30 C1, 58 C1, 59 C2 (restoring) are used for the second degree of concrete wear.
For the third degree of damage, Birss 59S3, 59 Ts compositions are used.
To correct larger defects, the following Birss mixtures are used: Concrete putty, RBM or 600 VRS (non-shrink).
With the help of Birss RSM, complex damage to concrete structures is restored.

The frost resistance of Birss compounds allows repairs to be carried out at sub-zero temperatures. They have high adhesive strength, elasticity, density and water resistance.

The advantage of the material is its affordable cost: from 400 to 450 rubles per 50 kg.

Another representative domestic production– Bars Consolit repair mixture, which is excellent for the restoration of vertical and horizontal structures. “Bars” gains the required strength as quickly as possible and does not shrink. The mixture has high level adhesion to concrete.

There are liquid and thixtotropic compositions. The first ones differ in the thickness of the applied layer, the slope angle of the repaired surface and cost. Price liquid mixtures varies from 800 to 1,000 rubles per 30 kg.

Thixtotropic solutions "Consolit Bars" are:

reinforcing (113 B60);
finishing (115 B50);
repair non-shrinkable (111 B30).

The moisture-resistant coating is created by the “Consolit Bars 100” mixture, which has an expansion function.

The price varies from 900 to 1,500 rubles per 30 kg, depending on the components of the composition and the region of sales.

"Ceresit CX5"

Repair of concrete structures in conditions high humidity It is better to do this using the Ceresit mixture (“Ceresit CX5”), which does not shrink when hardened and forms a moisture-resistant and frost-resistant coating that reliably covers all defects.

There is “Ceresit”, which has high technical characteristics, quite expensive - about 2,700 rubles per 25 kg.

"Knauf"

Waterproofing of concrete is usually carried out using the Knauf Flachendicht mixture, which, in addition to leveling the surface, makes it moisture-resistant and vapor-tight. The advantage of the composition is the absence of toxic additives and convenient packaging of 5-6 kg. The Knauf solution can be used both outside and indoors. Price – from 350 rubles per 5 kg.

"Osnovit"

New on Russian market– “Osnovit Innoline NC60” from “INDASTRO”. This is a gravy composition used for repairing vertical and horizontal surfaces. The mixture is used not only for restoration work, but also for installing equipment on a concrete base. The mixture costs about 800 rubles per 25 kg.

Using the dry leveler Osnovit Selform T-112, concrete floors and walls are repaired different types. Has a high level of adhesion and water-repellent properties. Costs from 160 rubles for 20 kg.

"Alit"

The composition of dry mixes "Alit" (SDR-UR, SDR-U, SDR-UM) includes quartz sand fine fractions, hydraulic binders and non-toxic polymer additives. The composition smooths out large cracks and chips, with a depth of 2 to 20 mm, formed on concrete foundations, load-bearing structures, stairs.

Possessing resistance to negative temperatures, "Alit" allows you to carry out repairs in winter.

The price of the mixture is from 1,100 rubles per 25 kg.

Mapei
Quick and convenient concrete repairs are guaranteed by the producers of Mapei dry mixes. The solutions do not shrink when hardened, do not crack, and eliminate cavitation, erosion and abrasion. Mapei repair compounds are presented on the Russian market in a large assortment:

High durable material used to restore floors in industrial workshops, repair airfield slabs, roads, canals and tunnels.

The cost of the mixtures depends on the components included in the composition and varies from 850 to 1,300 rubles per 25 kg.

"SW"

"SW" is a dry mixture used for repairing reinforced concrete products. The advantages of "SW" are resistance to the effects of adverse external factors: mechanical and dynamic loads, high and low temperatures. Moisture-resistant and durable composition suitable for repair work in the shortest possible time. When the solution hardens, it forms an anti-corrosion protective covering and is an excellent waterproofing agent.

Price for 25 kg – from 240 to 260 rubles.

How to choose the right repair material

To choose the right mixture for concrete repair, you must follow a certain algorithm of actions.

Determine the parameters of the repaired area: type of surface, amount of damage, load during operation.
Select the type of mixture: cast or dry.
Select the type of solution (with good adhesion, fiber reinforced).
Compare prices, mixture components and choose a manufacturer.
Calculate the amount of material required to complete the work.

Before ordering and purchasing the mixture, you need to pay attention to the following characteristics:

hardening time;
mixture consumption per 1 m2;
protective functions of the solution;
shrinkage (shrink-free compounds should be selected).

The market offers a huge number of different repair compounds for restoring concrete structures that have lost their original characteristics. They differ in composition, functionality, consumption, price, and quantity per package.

The correct choice of repair mixture guarantees concrete structures many more years of safe service.

Cost of mixtures for concrete repair

Approximate prices for restoration compositions are shown in the table below.

Concrete is the most popular construction material, characterized by high durability and strength, wide application, absolute non-flammability and low cost. However, violations of the technology of its preparation and installation lead to rapid wear of products and structures. Accelerated destruction of concrete is also facilitated by operation in aggressive environments and increased mechanical loads. As a result, the material loses its design strength and becomes covered with cracks and cavities.

For restoration, a traditional solution is not used, but a specially created repair mixture for concrete with suitable technical characteristics. Such compositions are produced and packaged in the form of a dry powder, which is diluted with water in a certain proportion. To give them special properties (frost resistance, moisture resistance, speed of hardening), various ingredients are added (plasticizers, modifying additives, fractional fillers).

Ready-made compositions for concrete repair are conventionally divided into groups.

By area of application:

For the restoration of structures and products experiencing increased mechanical loads (beams, columns, floor slabs, load-bearing walls).
For strengthening reinforced concrete elements susceptible to corrosion.
For repair road surfaces and floors.

According to the complexity of the composition:

Single-component (cement with large and small fractions).
Two-component (epoxy with different degrees of fluidity).
Multicomponent (liquid polyurethane).

There are also repair compounds for concrete with special conditions Applications:

Thixotropic - for vertical surfaces.
Casting - for horizontal planes.
Fast-hardening - for urgent repairs and eliminating leaks.
Frost-resistant - for use at low temperatures.
Industrial and domestic use.

Self-leveling mixtures are used when the thickness of the working layer is no more than 100 mm, and quick-hardening mixtures, which gain the necessary strength after 6 hours, are used up to 40 mm.

Selection method

Correctly selected repair dry mixture for concrete and strict adherence to the technology of its use will ensure the strength and durability of the product or structure. When purchasing a composition, you should take into account the nature of the damage, the size of the affected area and the operating conditions of the concrete. After hardening, the repair mortar should not shrink or delaminate. Its compatibility with the surface being restored and the required level of adhesion to it are extremely important. Almost every manufacturer of repair compounds additionally offers branded primers deep penetration, binding concrete and ensuring high adhesion to the solution.

When choosing the type of mixture, the extent of surface damage must be taken into account. Significant potholes, cracks and differences in floor levels are eliminated with solutions with large fractions. To seal small sinks and cracks, it is enough to buy a fine-grained concrete repair mixture with increased plasticity. If the product or structure is used in extreme conditions, then the restorative composition must contain additional ingredients that give it special qualities, for example, frost and water resistance.

Technology of use

Floor repair

To eliminate large damage on horizontal surfaces and differences in concrete floors, inexpensive dry cement-sand mixtures are usually used. Before application ready solution The work area should be cleaned of debris and dust, degreased, and then treated with a deep penetration primer recommended by the manufacturer. After assessing the extent of damage, it is determined required amount repair mixture for concrete. Recommended thickness cement-sand screed does not exceed 40 mm. Control beacons are set and the solution is drawn out, which will gain strength within 2 weeks. All this time, the surface of the screed, covered plastic film, should be periodically moistened with water to prevent cracking. To eliminate small floor defects, it is advisable to use self-leveling, finely dispersed self-leveling compounds with increased plasticity.

Crack repair

Before using the solution, the cracks in the concrete surface are usually widened. To do this, grooves up to 50 mm deep are cut around them with a diamond wheel or grinder, and then the destroyed material is selected with a hammer drill or chisel. Work area cleanse compressed air from debris and dust, treated with impregnation, after which a repair solution is applied. Cracks on horizontal and inclined surfaces eliminated by saturation method without overpressure. To fill vertical cracks, inexpensive and practical repair mixtures MBR 300 and MBR 500 for concrete are often used, which differ in strength characteristics and hardening speed. In some cases, to fill internal voids and deep cracks, they resort to the injection method using a special device - a packer. The repair compound that has come out on the surface under pressure is removed with a lath, and after hardening it is ground.

The process of hardening of all binders in the air is accompanied by an inevitable process of shrinkage.
Deformations that occur during the process of reducing the volume of the cement mixture can cause the formation of cracks in the finished concrete, which will not only negatively affect appearance structure, but will also disrupt its solidity, significantly reducing the operational period.
Dry repair mixtures applied to places where the concrete layer is damaged can correct the situation by restoring the solidity of the concrete structure. This dictates the need to use concrete repair mixtures.

Features of our mixtures for concrete repair

When buying dry mixes for concrete, instead alternative options repairs, the client not only saves own time, but also the budget. The reason for this is the optimal price-quality ratio of our products, which allows us to achieve the first results within 24 hours from the moment of application, which is an order of magnitude faster than traditional analogues.
Among other things, concrete repair is accompanied by an increase in water resistance in the areas where the mixture is applied. This effect is achieved due to the adhesion process that quickly occurs between damaged concrete and a multicomponent non-shrinking mixture.

Concerning temperature regime, the concrete repair composition has high hardening rates, arriving in a temperature range from +5 to +80 degrees Celsius.

The retention period for the consistency of the diluted mixture reaches 60 minutes, which is quite enough for spot application.

Advantages

By choosing our fast-acting materials, the customer enjoys a wide range of benefits. Among them:

reasonable cost
Possibility of delivery to the customer's address
an impressive range of repair mixtures for damage of any type and size
compliance of materials sold European standards quality, which guarantees durability

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 questions about the repair of concrete structuresThe most common damage

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 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.

Concrete floor prepared for renovation

Types of mixtures

To carry out repair work, the most different compositions. 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:

Mixture type	Properties	Features of application
Bulk	The use of components that provide increased fluidity allows particles of the repair composition to penetrate deep into damaged concrete, securely bonding to the base.	Used to restore defects in horizontal surfaces - floors, screeds, ceilings, etc.
Thixotropic	When mixed with water, the material becomes plastic and does not delaminate or shrink. High viscosity prevents the free flow of the composition from the damaged area.	They can be used both for sealing horizontal cracks and for repairing walls. With a certain skill, it can be used to eliminate defects in the ceiling.

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 repair 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:

Let's fall asleep 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, diamond drilling into concrete is used to remove damaged parts.

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

Particular attention should be paid reinforcement cage. 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 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 sudden temperature changes in the room.

At optimal use 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.

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 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.

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.

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:

Mixture type	Properties	Features of application
Bulk	The use of components that provide increased fluidity allows particles of the repair composition to penetrate deep into damaged concrete, securely bonding to the base.	Used to restore defects in horizontal surfaces - floors, screeds, ceilings, etc.
Thixotropic	When mixed with water, the material becomes plastic and does not delaminate or shrink. High viscosity prevents the free flow of the composition from the damaged area.	They can be used both for sealing horizontal cracks and for repairing walls. With a certain skill, it can be used to eliminate defects in the ceiling.

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 repairing concrete surfaces with your own hands. Of course, its efficiency will be somewhat lower, but for domestic needs it is quite suitable.