Build Daily

August 12, 2017 18:06

Close up cracks in concrete

Close up cracks in concrete

Many homeowners interested than patch up the cracks in the concrete, as it is a fairly common problem for cottages and country houses.

Concrete is used in different spheres - to fill the floors of apartments and houses, industrial buildings, roads, and for the construction of the foundation.

This material is poorly withstand stretching during drying concrete structures are narrowed, due to what may appear different defects and disclosure.

is especially true of concrete floor or foundation.

In addition, cracks often appear due to the metal reinforcement corrosion, temperature instability, various negative impacts.

This defect is very dangerous and widespread, and in order to solve the problem, you need to know why it arises, what are the reasons for disclosure.

Experts identify such causes of cracks in concrete:

  • Violation manufacturing technology mix is ​​still in the factory when the ratio of water and cement disturbed.
  • Because of this stamp composition is not as specified.In addition,
    long-term transportation leads to "weld" concrete;
  • errors in the calculations - are also frequent causes of cracking.Lack of reinforcement or severe harm to the integrity of the load of concrete pavement.It is important to adhere to the norms SNIP in the implementation of all settlements;
  • difficult geological conditions.It is not always taken into account in the calculation of soil characteristics in the area;
  • Improper technique when laying the mixture.Often, in order to fit more convenient composition, it is diluted with water, which prevents the concrete strength gain.In addition, improper sealing of concrete formwork and dismantling, as well as neglect of reinforcement placement rules on standards SNIP subsequently lead to concrete cracking and sagging;
  • Violation of the rules curing compounds, particularly for laying in hot weather, when moisture evaporates too quickly from the coating;
  • construction of various objects, which were not taken into account in advance in the calculations;
  • is not always possible to choose the type of foundation on the rules SNIP, which is why in the course of construction operation and may experience deflections and cracks;
  • Another common cause of cracks is the rusting reinforcement, whereby the volume of metal is becoming more and breaks the concrete coating on the inside.

Concrete cracked


  • Species cracks
  • Repair grout and mixes
  • Repair elastic sealant
  • repair epoxy
  • Repair cords and ribbons
  • Repair cracks by injecting
  • Prevention cracking

Species cracks

to know how to fix a crack in the concrete, it is necessary first to determine what type it belongs:

  • through cracks occur when a tensile force;
  • surface cracks appear after the concrete dries due to violations of the formulation of the solution;
  • Cracks appear in the stretch zone in bending and directed transversely to the reinforcing bar;
  • Cracks, located at an angle to the armature, which arise under the influence of transverse forces;
  • Parallel fixture shrinkage cracks that appear due to frost heave, uneven shrinkage or improper anchoring.Because of these cracks occur shrinkage and deformation of the foundation and the whole building.Shrinkage cracks may also appear if the load calculation was not made according to the rules SNIP;
  • Small cracks that appear when the temperature drops;
  • hairline cracks occur for the same reason as the previous ones, but usually does not exceed the depth of a few millimeters.

determine the causes and types of fractures are defined with a view of maintenance work.

Repair grout and mixes

This type of repair can be considered as the simplest and at the same time the weakest.This temporary partial filling floor cracks, wall and foundation both in dry and wet locations.

Such filling cracks do not seal them, but protects against contamination for some time and prevent their further disclosure briefly.

begin repairs on the rules SNIP with the preparation of the disclosure.

It should be checked for chips, as they in the future can be formed cracks and other disclosures.Chisels traversed the entire length of the crack to make it wider.

Hidden chips that occur during operation, should be immediately removed.

further purified crack water and a brush to clean a variety of dirt, you can also use a vacuum cleaner.residual water to collect sponge.

should also deepen the crack of 5 mm to the solution held firmly with a spatula.

for repairs make a solution of 3 parts sand and 1 part cement, which also need to add PVA glue.The solution should be sufficiently thick.

Pour it into the crack with a trowel, and on top of moistened.If you make a repair using a polymer blend instead of using a concrete mix, wet composition is not necessary.

In the middle you can see the cracks usually valves, it must be cleaned and covered with a special tool, which will prevent corrosion.Next you need to make the grooves and place them in the valve slices of 4 mm.


now evenly across the surface is applied adhesive composition to the layer thickness was about 3 mm, and without waiting for drying, you need to fill in all of this solution.

solution must be sealed so that he got into all recesses and bumps, and the surface leveled wooden rack that you want to move left and right, on the surface of the solution.

If the gap is very deep, and the solution is desirable to lay a few taps.At each stage, the surface needs a little sprinkle of water.

Make concrete surface is perfectly smooth to help special metal trowel.When the solution is frozen, the excess must be removed with a spatula.

If concrete surface you paint or covered with laminate, such work can be done within a day after the repair is done, but you must wait longer for laying tiles.

important to know that after drying shrinks solution, therefore priming composition is placed slightly above the level of the floor, and after drying it snaps into place.

If, however, this did not happen, with the help of a former grinder surface cracks are aligned to the desired level.

If you are dealing with a crack width and a large enough length to handle it before repairs can be circular saw with a diamond blade, then the repair is made according to the scheme described above.

This method of termination is most often used as a temporary solution, since the sealing does not take place during this repair.

method is relevant for dry and for rooms with high humidity, which require a good waterproofing.


Repair elastic sealant

seal cracks will also elastic sealant.

most popular in this case is silicone glue - sealant.This is used as a sealant for small cracks, and those having a width large enough.

Repair process that requires the use of the sealant, no different from the repair, which uses a concrete structure.

First you need to clean the dirt from the crack, making grooves for better bonding with the surface material.When applying the adhesive - sealant to the surface, it is also sure to moisturize.

sealant, in contrast to the cement mixture, dries quickly, making this material much more comfortable.

However, the sealant is considerably more expensive, so this repair is not everyone can afford to be.

Elastic sealant

repair epoxy

in concrete to seal the cracks are used as epoxy resin and epoxy repair.

First you need to embroider the disclosure and remove loose concrete and chipped.The width of the groove should be no more than 25 mm and not less than 4 mm.

Every 400 mm along the crack to do the transverse grooves 150 mm in length.With the help of a vacuum cleaner collect all the garbage and dust and treated with primer the joints.

The transverse grooves, which were made earlier, put metal brackets for reinforcement.Next, according to instructions and diluted epoxy solution was added to it hardener.

The epoxy solution and poured sand and pour the mixture into the sulcus.

Top epoxy solution was sprinkled with sand, and the sand in an hour cleaned with a vacuum cleaner.

Repair cracks in the concrete with epoxy quite economical, and drying takes very little time.Moreover, such processing fissures prevents their further movement.

You can use it to dry the screed.

If you need to handle epoxy coating for the liquid medium in the mixture should be added the sand.Sprinkle the top with sand and should not be.


Repair cords and ribbons

If you need to cover up the cracks in the pool or water tank, in the underground section of the basement or on the outer buildings walls that require high-quality insulation, the methods described above will not be enough for structural strength.

To handle disclosure in such places usually use a special composition.The cost of such repairs on the order above the usual way, but in a wet environment, it is fully justified.

For each task in the sale of a special material, you just have to make the right choice.

With these materials ensures complete sealing of cracks, so that the coating will last for years.

Repair is possible both indoors and outdoors, at any time of the year.

begin repairs as in the previous cases, it is necessary to disclose treatment.After all the excess has been removed, and cleaned with a vacuum cleaner surface grooves, measured width and depth.

This is done in order to choose the right self-expanding cord repair.

In propyl stack a cord that must lie without coercion, free.

Cord for cracks in concrete

to the bottom and top of the furrows must be 20-30 mm, so that later expanded cord.Whatever type of cable you choose, you can not put him violently.

Now, on top of the cord is applied polyurethane sealant, which surface is leveled with a spatula.Clay, who got out of the seam, remove the sponge.

usually written on the packaging, a material is preferred for this type of cord or ribbon, strictly follow the recommendations.

If you use this material in a relatively dry areas where waterproofing is used only for insurance, finishing can be done with the help of cement mortar.

In order to choose the material for the repair of concrete, should be familiar with the fact, what are these materials differ from each other.

Today this range of products is wide enough.

This material consists of polymeric resin, and the modified clay, as well as the material composition includes bentonite or analogue thereof which binds a surface between them and seals.

As to the form of release, they are the following:

  1. cord - a material used to repair cracks are not deep 30 - 50 mm;
  2. Feed - the material is placed in a crack width of 20 - 50 mm and width up to 150 mm;
  3. Pasta - sealant is used for the treatment of small furrows;
  4. Mats - fasten a layer of concrete covering, and when the old paint - fit a new layer.

Repair cracks by injecting

name of this method speaks for itself - injection involves the introduction into the voids formed in the concrete, special materials "injections".

Injection allows to repair concrete pavement without replacing the entire concrete pavement.

This is one of the most effective ways to repair these defects, which also is quite economical.

Injection involves injecting cement, epoxy or polymer mixture in the crack under the pressure, so that the mixture fills any voids and the smallest cracks.

Due to this construction gives a very robust and reliable.

With this method also performed concrete waterproofing, which is used for different compositions.


Prevention cracking

Even at the stage of pouring concrete is very important to make sure that the composition of the concrete floor and the basement was of high quality, with all proportions.

When placing a concrete structure, you need to carefully seal it not only manually, but with a special tool.

to moisture from the freshly poured concrete does not evaporate at high speed, it can be covered on top with a damp cloth.

In addition, the market today there are special preparations that will protect the concrete coating from the appearance of cracks and chips in contact with water.

Do not neglect these means, since the waterproofing is very important for the integrity of the concrete pavement.

walls and foundation through such means will help prevent further crack opening.