FAQ

What is a composite reinforcement bar?

Composite rebar - a modern building material replacing the usual steel rods.
It is intended for reinforcing concrete or strengthening multilayer masonry walls.
Composite reinforcement bar is a rod with a spiral wound belt extending above the core.

Why do I need a composite rebar?

Composite reinforcement is necessary to create durable structures that are not subject to destruction from time. For today it is the most technologically and economical in application reinforcement.

How is the composite reinforcement better than metal?

1. Strength - composite reinforcement has strength characteristics 3-4 times superior characteristics of steel rebar for breaking.
2. Durability - the coefficient of temperature expansion of composite reinforcement is close to the coefficient of thermal expansion of concrete, so that in the concrete structure there are no associated microdeformations, microcracks and the overall durability of the structure is substantially increased.
3. Chemical resistance - composite reinforcement has great chemical resistance in various aggressive environments, it is not susceptible to corrosion, which also positively affects the durability.
4. Lightweight - fiberglass reinforcement with comparable strength characteristics is lighter than steel reinforcement 9 times.
5. Low thermal conductivity - due to low thermal conductivity, "thermal bridges" do not form in the structures, which reduces temperature loss to 34% and, accordingly, the cost of conditioning the building.
6. Ease of installation - reinforcing bars can be cut from the bay of any given length, fastened with plastic clips, special fasteners-clamps, and not just a binding wire.
7. Ease of transportation and storage - it is possible to fold the reinforcement into coils, which makes it possible to use even passenger cars and boda boda for transportation and save considerably at the same time.

How does your rebar differ from analogues from other manufacturers?

The "MRG-Composites" rebar have higher physical and mechanical properties and stable quality - due to the raw materials and components used by the best manufacturers and advanced technology. It is stronger and more durable with the same diameters. Rebar " MRG-Composites " with a margin overlaps the requirements of ISO 10406-1:2008.

Where you can see the objects on which the composite rebar used, and talk to their owners?

The company " MRG-Composites does not have the ability to track objects in which our customers have used composite reinforcement. If you want, information about such objects can be found on the Internet.

Where can I buy composite Rebar?

The points of sale are indicated in the "Buy" section on our website. Recommended retail prices are listed in the price list on our website. However, the company " MRG-Composites " does not carry out retail sales of composite reinforcement. The exact price can be found at the retailers listed in the "Buy" section on our website.

What is the minimum quantity or minimum purchase amount?

With retailers, you can buy any quantity of rebar you need.

How is the composite reinforcement packed, what is the minimum and maximum length of the rod?

Composite rebar "MRG Composites" is produced in the form of rods of various lengths. Rods with diameters from 4 mm to 10 mm (inclusive) are produced in lengths of 50 and 100 meters and are packed in coils. Starting with a diameter of 12 mm, the rebar is produced by twigs 12 meters long.

How many meters in the packing rebar each diameter and where to find this information?

Details are indicated on the label.

How much does one package or bay of reinforcement weigh?

Details are indicated on the label. Approximate weight:
Weight of the bay 6 mm, 100 m = 4.6 kg.
Weight of the bay 8 mm, 100 m = 8 kg.
Weight of the bay 10 mm, 100 m = 12 kg.

Can I create an order not in packages, but in separate items in pieces?

You can form an order in any form by sending an application to e-mail: info@mrg-composites.com

What is an individual order?

Individual order is formed directly by the buyer. You can choose the reinforcement of any length and diameter in the amount necessary for the construction of the object.

How to transport composite rebar?

Rebar in coils can be transported in the trunk, by car or boda boda. A rebar with a diameter more then 10 mm is produced in 12 meters long rods, so a truck is required to transport it.

What equipment is required for unloading of composite rebar?

Forklift. A small amount can be loaded manually.

Are there special storage conditions for composite reinforcement?

To store composite fittings produced by the company "MRG Composite" does not require special conditions. Rebar can be stored in unheated warehouses or in heated warehouses no closer than one meter from the heating devices for 2 years in accordance with ISO 10406-1: 2015.
It is not recommended to store composite rebar on the open site more then 3 month without any coverage.

Are there any discounts depending on the amount of the order?

Cumulative discounts are possible. Terms are discussed individually with each buyer.

What is the savings with fiberglass composite rebar?

The size of the savings depends on the type of concrete construction. In general, with an equally strong replacement of steel reinforcement on fiberglass composites, the size of savings can be significant.

Where is the savings?

Savings are achieved due to the higher strength of glass composites compared to steel, which allows the use of a smaller diameter. And also at the expense of saving on transport costs - for transportation of reinforcement in diameter from 4 mm to 10 mm (inclusive), there is enough trunk of the car or boda boda.

How to determine the quality of the rebar?

The quality of composite rebar is determined by conducting tests in the production and in specialized laboratories. However, when buying a composite rebar, you should pay attention to the following:
1. On the cylindrical surface of the reinforcement bar there should be no cracks, chips, delaminations, shells, scuffs with a gust of winding, dents from mechanical impact with damage to the fibers.
2. The rebar must not have a pronounced brown color (a bright brown color indicates a violation of the temperature regime during production and damage to the composite). This leads to the fragility of the rebar and to its complete worthlessness. However, if the use of coloring agents (coloring additives) or sand coatings was used in the production of the fixture, this characteristic may not be entirely objective.
3. Quality rebar is characterized by the preservation of the exact diameter of the rod. The diameter of the reinforcement should be the same throughout the length of the rod.
4. The rod should be evenly coated with a cured epoxy resin, without any deposits, smudges, resin-impregnated areas.
5. Armature of diameters of 6 mm and above is not susceptible to brittleness. It's hard to break such an armature with your hands.
6. Wound belt (winding thread), which creates a ribbed reinforcing bar, can also be a factor in evaluating the quality of the rebar. The winding of the armpole should be uniform. An important point is the strength of the cohesion of the winding thread with the main shaft. It is necessary to arm yourself with a knife, an awl, a nail or other tool that will help to clarify the quality. If the thread is picked up and you are able to separate and wind the wound belt, then this is a defective rebar. On the qualitative rebar it is possible to separate only a small tip of the thread.
The company "MRG-Composites" carries out input control of raw materials and materials, operational control (parameters of equipment operation), acceptance control of finished products. To test compliance with the requirements of ISO 10406-1: 2015 the following tests are carried out: acceptance, periodic, typical.
During these tests, the following parameters are monitored:
1. appearance;
2. geometric dimensions: outer diameter, nominal diameter, length;
3. ultimate tensile strength;
4. tensile modulus;
5. compressive strength;
6. ultimate strength in cross-section;
7. ultimate strength of adhesion to concrete;
8. reduction of tensile strength after aging in alkaline medium;
9. ultimate strength of adhesion to concrete after aging in alkaline medium;
10. operating temperature limit.

Which certificates and test reports are available for the composite reinforcement?

The quality of composite rebar manufactured by MRG-Composites is confirmed by the ISO 10406-1: 2015 certificate of conformity, the quality certificate. There are also test reports issued by an accredited laboratory with a well-known name in the field of testing of reinforced concrete structures.

Are there any facilities in which composite rebar have already been applied?

Today, the use of composite reinforcement is already massive, and our company does not have the ability to track all the facilities on which it is applied. If you want, you can always find information about such objects on the Internet.

How to mount (install) rebar?

Mounting of composite reinforcement is made in the same way as metal. But thanks to the low weight of fiberglass reinforcement, it is possible to mount the rods with plastic clips, and not just a tie wire.

How does the composite reinforcement fit into the corners?

The laying is perpendicular, so that the perpendicular rods intersect with each other at a right angle.

What tools to use during installation?

Tape-measure, angle grinder.

How to cut rebar?

Cutting is carried out with a grinder, with a disc for cutting metal or ceramics. It is recommended to use diamond-coated discs.

What is the binding of the composite reinforcement?

Plastic clips or tie wire, and also with the help of special plastic clip-clips. Faster and cheaper - plastic clips.

How to knit grids from composite rebar?

Plastic clamps.

What precautions are needed when working with fiberglass rebar?

Gloves with PVC-spraying. When cutting the rebar, additionally use personal respiratory protection (respirator) and eye protection (goggles).

How to enroll coils?

Caution, in view of the sufficiently high elasticity of the composite reinforcement. It is most convenient to uncoil the fiberglass reinforcement with the aid of a coiling block.
If it does not exist, proceed as follows:
Option 1:
• Wear gloves and goggles;
• put the bay on the ground vertically (like a wheel);
• step one foot on the bottom of the bay and press it to the ground;
• holding the bay with one hand, the other carefully cut the tape, which wrapped the bay;
• holding the bay with one hand, the other carefully untie or bite the wire with a wire cutter, to which the bay is fastened;
• Unwind the bay by holding it with one hand and slowly removing the free outer end of the rod.
Option 2:
• Prepare two boards longer than the diameter of the bay;
• Wear gloves and goggles;
• put the bay on the ground flat;
• Insert one board across the bay in such a way that one of its ends is on top of the bay and the other on the bottom;
• from the opposite side of the bay insert the second board in the same way;
• Stand in the center of the bay;
• gently cut the tape that wrapped the bay;
• gently untie or bite the wire with a wire cutter, to which the bay is fastened;
• the bay at this moment should straighten out;
• Take the free outer end of the rod and unwind it.

How to recycle composite fittings?

In the same way as glass bottles or broken glass.

Is it possible to use composite reinforcement together with metal?

Possible, in some cases - it is necessary.

Is it possible to use composite reinforcement in slabs and walls?

Possible. At the same time, it is required to provide the necessary reinforcement. Depending on the loads and design features, additional calculations of the designers are needed. Fiberglass reinforcement can be used in the load-bearing structures of buildings up to 3 floors with detachable formwork and up to 5 floors with fixed formwork.

What is necessary to use the embedded elements in conjunction with composite glass reinforced plastic in the case of erecting structures designed to operate under the influence of aggressive environments?

In constructions with composite fiberglass reinforcement intended for operation in conditions of aggressive environments, steel reinforcement and embedded products of stainless steels or with protective coatings should be used.

What class and type of concrete to use when using composite reinforcement?

There are no special requirements for the components of the concrete mixture (cement, aggregates, additives) when reinforcing concrete structures made with fiberglass reinforcement. It is also possible to use fiberglass reinforcement with portland cement according to ISO 10426 and its varieties (sulfate-resistant, hydrophobic, etc.). The quality of concrete mixtures and their preparation technology should enable collection of concrete structures that meet the requirements of the quality norm.

Are the any requirements for the width of the crack opening provided for structures made of composite fiberglass rebar?

Structures with composite rebar are not required for crack opening width. The maximum allowable crack opening width should be set based on design requirements, operational availability, aesthetic considerations, the availability of permeability requirements for structures, and also depending on the duration of the load. For massive hydraulic structures, the maximum allowable crack opening width should not exceed 0.5 mm.

How to calculate and design concrete, stone and reinforced structures using composite rebar?

Calculation and construction of concrete, stone and reinforced-stone structures using composite fiberglass rebar should be carried out in accordance with standarts taking into account design and technological solutions for the use of composite glass rebar plastic reinforcement in concrete structures and its characteristics reflecting the specific properties of this type of reinforcement and features of its work in concrete. Calculations and construction of foundations, tunnels, bridges, retaining walls, other geotechnical structures and structures using composite glass reinforced plastic reinforcement should be carried out in accordance with the requirements of regulatory documents for a particular type of structure.

What are the limits of deflections and movements of concrete structures made using composite fiberglass rebar?

Limit deflections and movements of concrete structures with composite fiberglass rebar are regulated by general requirements in accordance with standards proceeding from constructive, technological, physiological and aesthetic-psychological factors.

What are the requirements for fire resistance of concrete structures using composite reinforcement?

At high temperatures, fiberglass reinforcement loses its elasticity and begins to lose its original properties. In order to fully protect buildings, it is necessary to strengthen the insulation.

Is it possible to use composite rebar for pile reinforcement?

Possibly. Moreover, the corrosion resistance of composite piles is substantially higher than that of reinforced concrete piles.

In which areas of road construction is it expedient to use composite rebar?

When constructing the roadbed of railroads and highways, as well as embankments and ditches of various purposes, fiberglass rebar can be used for:
• strengthening the base of the roadbed;
• reinforcing the soil's body, embankments and depressions;
• protection and strengthening of embankments, embankments, gutters;
• installation and structural fastening of geogrids on cones of overpasses and small bridges, on embankment slopes, dredges, drainage ditches and in other similar cases.

What standards exist and are being developed for regulating the use of composite reinforcement in construction?

At the moment, interstate standards have been developed and are in force, defining the technical requirements and test methods for the automatic transmission system, and draft codes of rules that define design and construction rules:
ISO 10406-1 Fibre-reinforced polymer (FRP) reinforcement of concrete -- Test methods -- Part 1: FRP bars and grids.
ISO 10406-2 Fibre-reinforced polymer (FRP) reinforcement of concrete — Testmethods — Part 2: FRP Sheets

What composite rebar is made of?

Composite rebar is manufactured on the basis of alkali-resistant glass winding, specially developed for the production of composite fixtures by Jushi Group Co., Ltd., a member of TOP-500 world producers of raw materials, (glass). Glass-roving is a bundle of continuous glass fibers. Another component is a binder compound based on epoxy resins, to which this tow is impregnated.

What is Continuous Alkali-resistant Glass Fiber?

Glass fibers are made from a glass melt of special chemical composition. Produced by forcing the melt through spinning spinnerets. The initial product is obtained in the form of infinite filaments (diameter from 16 μm to 24 μm), from which further in the process of processing yarns with a length of 20 km or more are formed in the package - this is a continuous fiberglass.
These yarns can be further subjected to any forms of textile processing (yarns, cords, twines, ropes), textile fabrics (fabrics, nonwovens), mesh (woven, special structure), and rods of any diameter and length. In this form, the glass shows unusual properties: it does not tears and does not break, but instead it easily bends without destruction.

What is a binder based on epoxy resins?

Compound is a mixture of thermosetting epoxy resins with curing accelerators. It is used for linking at the molecular level of glass fibers and provides the creation of a single structure of glass fiber and polymer, and also increases the physical and mechanical properties of composite reinforcement.

In accordance with what standard is the composite reinforcement produced?

Manufactured in accordance with ISO 10406-1 Fibre-reinforced polymer (FRP) reinforcement of concrete.

What are the advantages of composite reinforcement in comparison with traditional metal?

• Strength - composite reinforcement has strength characteristics 3 times superior to the characteristics of steel, for breaking.
• Durability - the coefficient of temperature expansion of composite reinforcement is close to the coefficient of thermal expansion of concrete, so that in the concrete structure there are no associated microdeformations, microcracks and the overall durability of the structure increases significantly.
• Chemical resistance - composite reinforcement has great chemical resistance in various corrosive environments, it is not susceptible to corrosion, which also has a positive effect on durability.
• Lightweight - fiberglass reinforcement with comparable strength characteristics is lighter than steel reinforcement 9 times.
• Low thermal conductivity - due to low thermal conductivity, "cold bridges" do not form in the structures, which reduces heat loss to 34% and, accordingly, the cost of heating the building.
• Ease of installation - reinforcing bars can be cut from the bay of any given length, fastened with plastic clips, special fasteners-clamps, and not just a binding wire.
• Ease of transportation and storage - it is possible to fold the reinforcement into coils, which makes it possible to use even passenger cars for transportation and save considerably at the same time.

What are disadvantages of composite reinforcement in comparison with a metal equivalent?

• The modulus of elasticity of composite reinforcement is almost 4 times lower than that of a metal one, even with an equal diameter (in other words, it easily bends). For this reason, it can be used in foundations, road slabs, etc., but application in floors requires additional calculations.
• When heated to a temperature of 600 ° C, the compound that binds the reinforcement fibers softens so much that the reinforcement completely loses its elasticity. To increase the stability of the structure of a fire in the event of a fire, additional measures should be taken to heat-protect structures that use composite reinforcement.
• Composite rebar, unlike steel, can not be welded with electric welding.
• Composite rebar can not be bent directly on the construction site.

Does the strength of composite reinforcement change when heated?

When heated to 600 ° C, the composite reinforcement completely loses its properties, which can lead to the destruction of the concrete structure. Therefore, it is necessary to use it in those structures that are not endangered by fire.

How does its strength depend on the ambient temperature?

The change in the ambient temperature on the strength of composite reinforcement is practically unaffected; it can be used at temperatures from -70 to +120 degrees Celsius.

What kind of reinforcement has better adhesion to concrete - composite or metal?

Both types of reinforcement have approximately the same adhesion to concrete. Composite reinforcement must have a bond strength of at least 12 MPa.

What is an equivalent replacement of steel to fiberglass?

Equal replacement is the replacement of metal reinforcement by a composite, taking into account the equal strength characteristics of the reinforced concrete structure. Without additional calculations, such an equivalent replacement can be used in concrete structures on an elastic foundation, where the influence of bending loads is minimized, and in those designs in which the low modulus of elasticity of composite reinforcement does not affect design calculations.
Such constructions include:
• foundations: houses, baths, fences, garages, cellars;
• swimming pools;
• concrete coatings, including industrial floors;
• piles, road slabs.

What is the durability of composite fittings? Does it break down with time?

In view of the relatively recent start of the application of this type of rebar, objective data on real objects are not available. The predicted durability of composite reinforcement is 80 years.

How to correctly determine the thickness of the protective concrete layer of the structure?

The thickness of the protective concrete layer of the structure should be assigned as follows:
1. The thickness of the protective layer of concrete should be taken not less than the diameter of the rod made of fiberglass rebar and not less than 10 mm.
2. The thickness of the protective layer of concrete at a heating temperature from 100 º C to 200 ° C should be increased by 5 mm and at least 1.5 diameter of the rod made of fiberglass rebar. The thickness of the concrete layer to the composite fiberglass reinforcement in terms of corrosion is not standardized.
3. When concrete structures using fiberglass rebar, the design thickness of the protective layer is provided by the arrangement of the formwork or the installation of fixatives from cement-sand mortar, heat-resistant and alkali-resistant polymeric materials.

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