Concrete is a material that is used today in all areas of construction. Its main advantage is high strength. In addition, this material is durable and reliable. But over time, even the most durable structures tend to collapse.
Causes of defects
The causes of chips, cracks and deformations are:
- mechanical effects;
- violation of the ratio of elements during mixing;
- environmental impact;
- load;
- negative factors.
In order to recover the material, a non-shrinking mixture should be used. It allows you to quickly restore structures and restore their geometric parameters, operational characteristics also return to normal.
Selection recommendations
Repair mixtures are dry and lithium. In order to fill the recesses and pre-prepared cracks, injection formulations should be used. They have the ability to expand and high adhesion, which means that they are well grasped with reinforcement, stone and concrete. When hardening, the material almost does not shrink, therefore it is called so. Injection mixtures freely fill the space, the solution seals and hardens the surface. This composition is mainly used in the restoration of horizontal surfaces.
Description of dry mixes
The non-shrinking mixture may also be dry. It is good in that it has high strength and frost resistance, which allows you to use it for the repair of products operated in conditions of negative environmental factors. Structures installed using dry formulations may be subjected to cyclic loads. Such repair mixtures are moisture resistant, have good characteristics and allow waterproofing of concrete. The material is not toxic, so you can even use it to repair potable water tanks. Non-shrinking dry mixes are used for:
- protection of concrete against corrosion;
- restoration of roads;
- restoration of floors, bearing surfaces and stairs.
Rating
Non-shrinking mixes are offered for sale by many manufacturers. The best of them have a high degree of adhesion to stone, concrete and reinforcement, do not shrink and are easy to use. If you make a rating, then Emaco mixtures will be the most popular. The composition is made in Russia by Basf.
Use the material you need to repair concrete with damage of varying degrees of complexity. These can be serious deformations and small cracks. In order to select a composition, it is necessary to assess the degree of damage. If it belongs to the first stage, then you should select "Emaco N 5100". This product is suitable for surfaces with cracks, dirt and sinks. Damage of the 2nd degree can be eliminated by Emaco N 900 or N 5200. This material copes with exfoliating and crumbled areas, as well as small chips. The following compounds will cope with cracks and rust:
Defects can have a width of up to 0.2 mm, while the depth should not be more than 40 mm. If the surface has exposed reinforcement and cracks of more than 0.2 mm, as well as a high level of carbonization, which can be attributed to the 4th degree, restoration can be done using Emaco T1100 TIX, S560FR and S 466.
If the concrete structure is badly damaged, has 200 mm chips and bare reinforcement, you can solve the problem with A 640 mixture, which does not shrink and is an anti-corrosion compound for a package weighing 25 kg, you will pay from 850 to 1000 rubles.
If you need a non-shrink mixture, you should read the rating. Among other market offers, it is worth highlighting the Birss compositions, which fell into second place. They are designed to repair material with any degree of complexity. The main thing is to choose the right material. For example, for a simple repair of a material with an exfoliating surface and cracks, compounds with numbers 28, 29, 30, as well as a mixture labeled 30H, are suitable. If you have to work with the second degree of deterioration, you should choose: 30 C1, 58 C1, 59 C2. But with the 3rd degree of damage 59C3 and 59 Ts are able to cope.
To eliminate larger defects, non-shrinking mixtures Betonshpakhtel and RBM are used. You can use 600 HRV from the manufacturer "Birss".
Non-shrinking concrete mixes can have different purposes. Some of them have excellent characteristics of frost resistance, which allows you to perform work at low temperatures. Such products have elasticity, high adhesion strength, water resistance and density. The main advantages of these compounds is their affordable cost, which varies from 400 to 450 rubles per 50 kg.
The third line of the ranking is occupied by mixtures from Bars Consolit, which are suitable for the repair and restoration of horizontal and vertical structures. These compounds do not shrink and have a high level of adhesion. They can be thixotropic or bulk. The latter differ in layer thickness, cost and surface angle.
Why you should choose Bars Consolit
These non-shrinking quick-hardening mixtures will cost you up to 1000 rubles. for 30 kg. Having familiarized yourself with the assortment, you can choose the finishing, reinforcing or repair mixtures. If you need to fill a hollow space, you should choose a moisture-resistant coating with an expansion function. The price of such quick-setting non-shrinking concrete mixes will vary from 900 to 1,500 rubles. for 30 kg.
Directions EMACO® FAST TIXO
This non-shrinking quick-hardening dry mix is a thixotropic composition with polymer fiber for structural repair of reinforced concrete and concrete in a short time. The material can be used at temperatures up to - 10 ° C. Recommended thickness of the applied layer is from 10 to 100 mm. Before use, the material must be combined with water, which will make it possible to obtain an immiscible composition with a high degree of adhesion not only with concrete, but also with steel, even in an aggressive environment.
Features of preparation
Before starting repair work, it is necessary to remove damaged areas from the concrete surface using a diamond tool. It is necessary to go deeper by 10 mm. Mortar or crushed concrete, as well as cement jelly, is removed using a lightweight puncher, sandblasting machine or needle gun. The surface should have a roughness of at least 5 mm. These manipulations are performed to improve grip. The fittings must be cleaned from rust. If the structure is used in aggressive environments, metal parts should be treated with NanoCrete AP at positive temperatures.
Instruments
To carry out the work you will need:
- trowels;
- buckets;
- trolleys;
- mixer.
All this should be at hand. The amount of material available should be sufficient. The repair compound is prepared only in such a volume that you can use it within 15 minutes. The repair composition is applied using a plaster station or laid with a trowel. When working manually, you should prepare a primer layer of a more liquid consistency or use NanoCrete AP material, which is applied at temperatures above +5 ˚.
Work Recommendations
The mixture should be rubbed into the base with a stiff brush. The main layer is applied according to the “wet on wet” technology. If desired, using a plastic, synthetic or wooden sponge grater, it is necessary to make the surface smooth. This treatment begins only after the composition has set, when the fingers, when pressed, do not drown in the solution, but leave a slight mark.