composite reinforcement (manufactured according to GOST 31938-2012) - non-metallic rods made of glass, basalt, carbon or amide fibres, impregnated with a thermoplastic or thermosetting polymer binder and cured. For bonding to concrete, special ribs are formed on the surface of the composite reinforcement during the production process or a sand coating is applied. Composite fittings are produced in the diameter range of 4-40 mm. JSC UCT offers to supply glass fibre based reinforcement as it optimally combines properties and cost. The default is glass fibre reinforcement (ASK).
The chemical and physical properties of the polymer compounds give them several advantages over metal.
30% benefit with equal replacement of metal reinforcement for the composition
100% non-rusting and moisture resistant, not subject to corrosion and does not cause destruction of concrete
The composite reinforcement is tied with wire or joined with plastic fasteners.
Increases the service life of the structure by 2-3 times (50-80 years). The need for expensive repairs disappears
Reduces the cost of transportation and loading and unloading operations, and also facilitates the execution of work in the facility
Does not create screen and interference for radio waves, cellular communications and Wi-Fi
From -70 to +2000С does not change its operational characteristics, which excludes cracking
It does not emit harmful and toxic substances. Complies with all European standards. Does not harm nature
At the customer's request, as opposed to the 6 or 12 meter metal.
100 times lower than steel, significantly reducing heat loss
The composite reinforcement is 2-2.5 times stronger than metal with the same diameter.
Not electrically conductive, electrically safe
With all its advantages, fiberglass reinforcement is inferior to steel in two respects.
Fiberglass reinforcement belongs to the group of self-extinguishing materials. Fiberglass, although it has a high resistance to heat, but has a rather low combustion threshold. At temperatures above 200, the reinforcement loses most of its properties, but this is not a disadvantage in practice, because it is necessary to achieve these values with glass fibre reinforcement directly in the concrete, which means that the "outside" temperature is several times higher than 200 C, and at such temperatures the metal also loses all its properties. When used below ground level, this disadvantage no longer plays a role.
The glass reinforcement of the steel is distinguished by a low modulus of elasticity. When the reinforcement is used to lay the foundation, this feature is an advantage, but when the fiberglass reinforcement is used to reinforce the floor slabs, additional calculations may be required, and ideally, to achieve the necessary strength indicators and significantly improve them, it is recommended to use both the metal and composite reinforcement together. Our company's specialists can help you make all the necessary calculations.
The combination of material properties creates, in accordance with GOST 31938-2012, a number of recommended applications where it is recommended to replace traditional steel reinforcement with fibreglass.
The polymer composite reinforcement is intended to reinforce heavy, fine-grained and lightweight aerated concrete structures, even under conditions of exposure to aggressive media containing chloride salts, alkalis and acids, as well as under the systematic effects of temperatures from minus 70 ° С to 100 ° С.
Due to the increased strength characteristics in the recommended areas of application, fiberglass reinforcement replaces steel with a decrease in diameter without loss of structural strength. In recommended applications, replacement is most often accomplished in the following manner:
|Corresponding diameters for replacement of equal strength of the reinforcement*|
|Steel reinforcement class A-III (A400C)||6||8||10||12||14||16||18||20||22||25|
*Final replacement is determined by design conditions.
1) Direct price benefit of 15 to 30% (depending on the characteristics of the country, its market and design conditions)
>br /> 2) Increase in the duration of operation of the structure (especially in aggressive environments). The composite reinforcement retains the properties of 70-80 years.
3) Reducing the cost of maintaining the structure by reducing corrosion damage (needs Buchkin consultation).
4) Facilitating loading and unloading. No special equipment is required for workers.
>br />5) Cheaper logistics. To transport the same amount of steel and composite reinforcement meters less equipment is required. A specific example: the supply of reinforcement for the upper foundation slab of a 17-storey, 6-section building in Drozhzhino (Moscow Region). For the transport of steel reinforcement, 5 KAMAZ would be required and for composite 3.
>br />6) Facilitate the installation of material. Composite accessories are joined with wire or nylon clamps using a special device in the form of a gun and therefore no welding is required.
Today, Russia and the world have gained extensive experience in the use of composite reinforcement in construction. Several of these objects are listed below.
Replacement of class A500C metal fittings Ø20 with composite glass fittings Ø14.2 on the top grid of bottom fittings
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