In modern Russia is a great demand for new technology, quite firmly entrenched in the west and showed the feasibility of its application. One of them — the use of fiberglass for reinforcement of concrete products. Innovations usually more expensive conventional materials but for reinforcement of composite materials is not.
Interest in non-metallic fixture came in the middle of the XX century due to a number of circumstances. Expanded the use of reinforced concrete structures in important structures, used in highly corrosive environments, where it was difficult to provide corrosion resistance of the steel reinforcement. There was a need for a non-magnetic and dielectric properties of some products, and structures. Finally, we must consider the prospect of a limited supply of ores, suitable to meet the continuously increasing demand for steel and alloying additives are always scarce.
Stainless composite rebar has a number of advantages over conventional metal fittings, and first of all it is corrosion resistance, high tensile strength, much less weight and the price is lower than the same metal. It can be used at a temperature of — 70 and 100 degrees Celsius before. Of the other advantages worth noting better elastic properties (ie the less plastic deformation), the lack of electrical conductivity (which eliminates stray currents), low thermal conductivity. The composite reinforcement is designed for use in concrete structures with prestressed and unstressed reinforcement.
Industrial use of non-metallic reinforcement in the USSR and abroad, began in the 70s, several facilities were built using only fiberglass reinforcement, which still stand without problems, for example, a lighthouse in the city of Sochi, built about 40 years ago . The problem was the high cost of fiberglass, and the cheapness of the metal. So if the technology is not yet developed. Nowadays, the situation is reversed: the metal becomes more expensive with each passing year, and now more than fiberglass and is available at a price as well. According to all the forecasts of analysts composite rebar will soon become one of the most demanded materials in construction. Abroad, the process of mass transfer into non-metallic fittings began in the 90s, and now it is used very widely in the construction of important facilities, such as bridges over the canals, because composite rebar is not afraid of moisture and hence the design will stand much longer than using a steel reinforcement. Now the production of reinforcing fiberglass and basalt fiber developing in Russia. Its manufacture different manufacturers — the company TSK-IVF, Perm Research and Production Enterprise "ARMASTEK" TD "Basalt" and many others.
For the manufacture of composite rods pultruded using modern machines. (The word comes from the merger of pultrusion English word «pull» — pull and «extrusion» — squeezing). The process is as follows: first, in the form of continuous fiber strands (rovings) impregnated with the resin impregnated fiber on the molding die comes to allowing for a certain diameter rod. However, when it comes to reinforcing bars, it is important to provide good adhesion to concrete. This is achieved not only by the adhesion between the concrete and composite, but also due to the mechanical coupling of these materials. To achieve this profile is made with periodic repetition of the section.
You can individually select a number of areas in which the use of composite fiberglass reinforcement is preferred over metal counterparts. First of all, to such areas include reinforced concrete storage tanks and chemical industries, as well as sewerage and water treatment plants. Perfect composite rebar for strengthening the roadway, in the construction of foundations and other construction works. This material is also found use in conducting various types of rehabilitation and restoration works, as well as repairs.
It should also be noted that the technology of production of reinforcement is constantly evolving, and does not stand still. Thus, it is safe to say that the quality of the valve supplied with every year gets better, which also has a positive impact on the technical and operational characteristics of the material.