Cracks in concrete - is not a reason to be upset

repair concrete - when it is necessary to resort to surgery?

Almost all concrete and reinforced concrete structures in the process of drying shrink and shrink.And due to the fact that this material has a low tensile strength, cracks appear in the structure.Besides cracks in concrete can be formed:

• due to mechanical damage of the material (accidents, excessive loading, vibration, seismic activity, water wear);
• «due to" chemical damage (from the effects of alkalis, salts and acids);
• by physical processes (fluid leakage, temperature extremes, erosion);
• of reinforcement corrosion due to carbonation salts exposure, humidity, and carbon dioxide.

Yet, whatever the cause, as well as the nature of the damage, they must be eliminated immediately becausethese fractures in themselves serve as a source for further structural failure.In order to implement concrete restoration , you must visually inspect the damage and to select the desired method of repair.

Repair cracks in the concrete - select the way to

One of the popular ways to repair concrete surfaces is grouting.The essence of this method consists in the fact that the restoration work conducted without the partial replacement of the concrete structure, and due to the "injection" cracks and voids in the polymeric material.This type of repair is particularly recommended for large amounts of damage.

to repair vertical concrete surfaces can be used in the method of applying a special mixture of the repaired surface.Repair of concrete mix consists of cement-sand mortar and polymer additive.As the additive used furfuryl alcohol (0.35% by weight of cement) and sulfanol (0.02%).After drying the frozen mixture for the repair of concrete covered with a polyurethane sealant.

Also, concrete repair and restoration can be done by creating on the surface of the additional layer of the same material (shotcrete method with the use of concrete).Composition for concrete mixture includes cement, water, sand fraction, and the organic additive (bitumen, latex, resin, etc.).But the application of such a method is not always appropriate, sinceit is rather time consuming and thus increases the weight of construction, which entails increasing the load on the foundation of the building.

In addition, by drying the additional layer will shrink it, which can lead to a gap between the old and the new layer, and restore the structure will occur.

Sealing cracks in concrete with their hands

often from private developers, you can hear the question, than patch up the cracks in the concrete? In carrying out repair work in the home is usually applied slurry "dough", grout with a special binder, solutions with polyester or epoxy resin, as well as proprietary repair mixes.

Repair cracks in concrete up to 3 mm is carried out with liquid cement "test" or proprietary blend.Wider cavity, and the place where concrete flaked off, repaired proprietary solution or a special mixture.The proportions for the concrete mix: 1 part Portland cement, 3 parts sand and water, and PVA glue.

Sealing cracks in concrete require advance preparation.At first, necessary to clean the surface with water, brush and detergent.Excess water is removed with a sponge.Small cracks embroidered spatula and deepened to 5 mm, to cement mortar is well filled up all the space.Deeper and large cracks are strengthening "grinder" for this purpose saws transverse grooves.

If the fracture lurks baring fitting, it must be cleaned and treated with a special formulation that protects against corrosion.The precleaned furrow stacked wire pieces about 4 mm in diameter.

Using brushes need to apply a primer, its thickness is about 3 mm.Carefully and evenly distribute it across the surface of the repair.After that, we put a repair mixture (primer still wet).

When lime-cement mixture is applied, it is necessary periodically to moisturize, but if the seams were filled polymer compositions, the moisture is not necessary.The surface is leveled with a spatula.A day later the repaired surface it is desirable to cover the paint.