All about the amplification of carbon fiber

Strengthening construction – one of the main (if not the most basic) stages of any construction process, which is associated with stabilization and growth of the overall strength of the construction. Strengthening structures with merging – technology that is a little more than 20 years old and which is fairly considered progressive.

Peculiarities

It has a simple, but super-work method an impressive list of advantages, which is explained by the properties of the material. To accommodate steps, you do not need to use special techniques with great capacity capabilities, as carbon fiber is malfunction. Works themselves are conducted in 10 times faster than other technologies. At the same time, the mercalcan not only makes the design stronger – it improves and carrying the ability.

Carbon fiber is polyacrylonitrile (treated with the highest temperatures). In the course of reinforcement, the fiber is impregnated with a two-component epoxy resin, after which it is fixed to the surface of the object itself. The same epoxy resin demonstrates very effective adhesion relative to the reinforced concrete, and when a chemical reaction occurs, carbon fiber becomes rigid plastic, which in its strength in 6, and even 7 times the strength of steel.

Carbon fiber is valued for It is not afraid of corrosion, resistant to aggressive environmental factors. The load on the object by weight does not grow, but to operate the amplifier is capable of 75 years and more.

Carbon fiber requirements:

  • Fibers should be placed in parallel;
  • To preserve the structure of reinforcement elements, a special fastener is used;
  • Carbon fiber is made strictly according to the requirements of technology and complies with quality standards.

Among other wonderful properties of the material – the protection of the structure from moisture. Fiber perfectly copes with such a function as creating a dense waterproof layer. This is high strength, if it comes to the characteristics of the stretch, the value of the carbon fiber reaches 4900 MPa.

Eased and simplicity, really high speed of the mounting process, that is, every object can be strengthened in a short time, without spending renting equipment and call a large number of specialists. And this savings on labor costs, on the resources of temporary and cash makes carbon fiber with the top product in its segment.

Separately, it is worth noting the effectiveness of carbon fiber reinforcement technology. It will be such, if several conditions are observed: this is the natural moisture content of the structure that does not prevent the repair of the reinforcing material and the reliability of the fastening, and the properties of both fibers and glue.

Where applies?

The main application of application is the strengthening of reinforced concrete structures. The fiber is stacked on those areas of the design, which accounts for the greatest voltage.

What grounds for enhancing building structures can be allocated:

  • Physical aging of the object, the actual wear of the material and the individual elements of the structure (slabs of overlapping, columns and t. D.);
  • such damage to the concrete structure, which reduced its carrying capacity;
  • redevelopment of the room at which adjustments are made to the bearing structures;
  • situations where the request for an increase in the floors of buildings is received;
  • Strengthening structures dictated by an emergency and its urgent resolution;
  • Soil advances.

But not only with reinforced concrete interacts so successfully. The same applies to metal structures with a relative to the carbon fiber module of strength and elasticity. You can work with stone structures, such as pillars, walls of brick houses.

Wooden beams of overlapping should also be enhanced if the condition of the beam system requires interference if the bearing ability is obviously reduced.

That is, carbon fiber is an excellent and multifunctional material of the external protection of constructions from concrete, metal, stone, wood.

Reinforcement technology

Recommendations are theoretical basis of the process, not very laborious, but still requiring attention to all details.

Preparation of the foundation

Prior to the start of external reinforcement, carbon fiber need to carry out structural markup, that is, it is necessary to outset areas where the strengthening elements will be fixed. Measurements are made together with the purification of the surface from the old finish, from cement milk. To do this, use a corner-liner with a diamond cup. Another option – water-sandblasting machine. And cleansing occurs until a major concrete aggregator detected.

All the above actions need a very responsible performance, since the level of preparing the reinforcement reference directly affects the final result. Work on the efficiency of amplification begins with preparatory actions.

To pay attention to:

  • What are the characteristics of the integrity / strength of the material of the object to be strengthened;
  • It is smoothly the surface where carbon fiber will be mounted;
  • What are the temperature and humidity of the surface indicators where the enhancing material fixes;
  • Is there a dust on the spot, dirt, whether it is cleaned enough before the upcoming procedures, will there be insufficient cleaning to interfere with the adhesion of the base and carbon fiber.

Of course, the calculation of the strengthening of structures is performed on the basis of which work is carried out. Only highly qualified specialists should be engaged in this case. Of course, any independent calculations are fraught with non-counterfeit errors. Usually such tasks are solved by pro project organizations.

To calculate the amplification of the carbon fiber object, you need:

  • Results of expertise and survey of gain objects themselves;
  • high-quality, detailed photos of the object surface;
  • Detailed explanations.

The calculation usually takes 1-5 business days, it depends on the demand of specialists, their employment, etc.

Preparation of components

Itself carbon fiber is realized by rolls, translated into polyethylene. It is important that during the preparation of the working surface to the material of the reinforce, dust did not fall. And it will be – and most often during concrete grinding. If the surface is not deleted, do not protect from its hit, the material simply will not be able to soak in the substance – the work will be defective.

Therefore, before opening the mesh / ribbon, the work surface is always covered with polyethylene, and only then you can proceed to measurements. To cut the hydrocarbon mesh and tape, it is necessary to prepare a metal scissors, or a stationery knife.

But carbon fiber in the form of a lamellae is cut by a corner machine with cutting circle.

The adhesive is the compositions of two components, therefore it is necessary to mix these components themselves in the right proportions. So that these proportions do not disrupt, during the dosing process you need to use weights. Rule Iron, and it is: components are mixed smoothly, gradually connecting, the mass is mixed with a special nozzle drill. If errors are allowed in this process, it may cause the boiling of adhesive.

Important! At the hammer today you can find the adhesive material that is sold in two buckets. The desired proportions of the two components are already meant, they will simply stay on the instructions.

Another means that is taken in the process of preparing the mixture is polymer cement adhesive.

It is implemented in bags, differs from the previous one by the fact that it is bred by water according to the instructions.

Installation of materials

Mounting technology depends on what type of material is selected. Carbon tape is attached to the database can in two ways: dry or wet. Technologies have a general property: an adhesive layer is applied to the base surface. But with a dry method, the ribbon is attached to the database and impregnated with adhesive exclusively after the roller’s order. In the wet method, the same ribbon is initially soaked with adhesive composition and is also rolled up with a roller to the base.

Conclusion: These methods are characterized by a sequence of the assembly process.

Installation features:

To impregnate carbon fiber adhesive, the layer of this composition is applied to the surface of the fiber, passing by a roller, achieving the following: the upper layer of adhesive falls deep into the material, and the lower – appears outside.

Carbon tape glued in several layers, but still do not do more than two. It is fraught with the fact that when fixing to the ceiling surface, the material simply crashes under its own weight.

When the adhesive is polymerized, it will be perfectly smooth, that is, the finish is actually actually excluded.

Therefore, it is not necessary to wait for drying, and on the newly treated surface you need to apply a sand layer.

When carbon lamellas are mounted, the binder is applied not only to the object that is to be strengthened, but also on the mounted element itself. Label after fixing you need to tighten with a spatula / roller.

Carbon mesh is attached to the concrete, initially moistened base. As soon as adhesive is applied (manually or mechanically), immediately need to split the grid, without waiting for the drying of the clutch composition. The grid must go into the adhesive composition. Specialists prefer to use the spatula at this stage.

After that, it is necessary to wait until the composition is initially grabbed. And this can be understood by pressing – it should not be easy. If the finger is asleep with great effort, it means that the material grabbed.

And it serves as a signal that it is time to apply the finishing layer of polymer cement.

Protective coatings

Adhesive made on the basis of epoxy resins is a combustible substance. Under ultraviolet exposure, he also risks to become very fragile. Therefore, it is necessary to use such compositions with the stipulated flame retardant objects to be strengthened.

In general, the strengthening of the structure by carbon fiber is a progressive, with many points of view of an economical way to hardening the construction and its elements. Composites that are used in strengthening is much easier and much thinner more familiar materials. In addition, external reinforcement is a universal modern technique. It is used both at the construction stage of the building and in repair, during restoration work, that is, to strengthen the design, in many cases there is even no need to suspend its operation.

Carbon fiber enhances elements of residential and industrial buildings, architectural structures, transport and hydraulic objects and even the objects of the nuclear industry.

Well, those who believe that the use of new materials and technologies is always more expensive than traditional solutions, a priori is mistaken in the calculations. The strength of the structures increases at times, the building does not cease to be operated during the repair (and this could cause financial losses more serious sizes), by time this repair is very fast.

Experts believe that savings are about 20%.

How to strengthen the boards by carbon fiber, you can learn from the video below.

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