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Using of composite glass fibre reinforcement bars (gfrb) in construction

14 methods to use glass-fibre composite reinforcement bars described by the example of a three-storey building without the need for complex design and special calculations.

1. FOUNDATION PLATES

The technology of reinforcing foundation slabs for low-rise construction no higher than three floors using glass-fibre composite reinforcement (rebars) applies by replacing metal reinforcement bars with glass-fibre, according to the table of equal strength replacement.

Correct replacement with glass-fibre  reinforcement is guaranteed to lead to significant savings in money, because glass-fibre  reinforcement is cheaper than metal. Principle of reinforcing foundation slabs with glass-fibre reinforcement does not differ from reinforcing metal reinforcement, but gives results as a big saving of time spending for montage/installation.

When replacing metal reinforcement bars with the glass-fibre rebars, it is not necessary to reduce the reinforcement step (spacing).

If it is necessary to extend the glass-fibre reinforcement whip, the connection shall be made as overlapping. The overlap length is from 20 to 50 cm.

Glass-fibre reinforcement tying is made by knitting wire and glass-fibre reinforcement bars shall be cut by a grinding machine – “bolgarka”.

2. STRIP FOUNDATIONS

Reinforcement of the strip foundation using glass-fibre reinforcement is carried out by replacing the metal rebars with glass-fibre rebars according to the table of equal strength replacement.

The equal strength replacement table of metal rebars with composite glass-fibre rebars

Metal of class А-III (A400C) Composite polymer glass-fibre reinforcement bars (GFRB)
6 А-III 4 GFRB
8 А-III 5,5 GFRB
10 А-III 6 GFRB
12 А-III 8 GFRB
14 А-III 10 GFRB
16 А-III 12 GFRB
18 А-III 14 GFRB
20 А-III 16 GFRB

The correct equal strength replacement of metal reinforcement bars by glass-fibre reinforcement bars will allow you to get economic benefits up to 45% (double savings).

When replacing metal reinforcement bars with the glass-fibre rebars, it is not necessary to increase the number of reinforcing layers and the number of reinforcing whips in one layer.

If it is necessary to extend the glass-fibre reinforcement whip, the connection shall be made as overlapping. The overlap length shall be from 20 to 50 cm.

Glass-fibre reinforcement tying shall be made also by knitting wire and glass-fibre reinforcement bars shall be cut by a grinding machine- “bolgarka”.

3. REINFORCING OF INDUSTRIAL CONCRETE FLOORS

Reinforcing of industrial concrete floors by using glass-fibre composite rebars is carried out using glass-fibre reinforcement is carried out by replacing the metal rebars with glass-fibre rebars according to the table of equal strength replacement.

Correct replacement of metal rebars with the glass-fibre composite rebars during reinforcing of industrial concrete floors also leads to significant savings in money, because glass-fibre reinforcement rebar is cheaper than metal one.

Principle of reinforcing foundation slabs with glass-fibre reinforcement does not differ from reinforcing metal reinforcement, but gives results as a big saving of time spending for montage/installation.

When replacing metal reinforcement bars with the glass-fibre rebars, it is not necessary to reduce the reinforcement step (spacing).

If it is necessary to extend the glass-fibre reinforcement whip, the connection shall be made as overlapping. The overlap length is from 20 to 50 cm.

Glass-fibre reinforcement tying is made by knitting wire and glass-fibre reinforcement bars shall be cut by a grinding machine- “bolgarka”.

4. SKIRTING (BLIND AREA) AROUND BUILDINGS

The blind area (skirt) is a strip with a width of 0.6 m to 1.2 m, which is adjacent to the foundation or base of the building with a slope.

The slope of blind area must be at least 1% (1 cm per 1 m) and not more than 10% (10 cm per 1 m).

It is recommended to carry out blind areas around the building using glass-fibre reinforcement bars because the main functional goal of blind areas id the drainage of surface rain and melt waters from the walls and foundation of the house.

The blind area (skirt) by using glass-fibre reinforcement bars will last  longer by several times because glass-fibre reinforcement bar has the high corrosion resistant properties, which prevents cracking in concrete.

5. reinforcement belt (seismic belt) between floors of the bRICK OR BLOCK BUILDINGS

Using of glass-fibre composite reinforcement bars for reinforcing an armored belt (seismic belt) between floors of brick or block buildings, due to the high strength characteristics, increases the spatial rigidity of the building and protects the foundation and walls from cracks caused by uneven fallouts and frost heaving (boil) of soil.

6. BINDERS FOR MASONRY

For improving masonry (brickwork) strength and maintaining the same thickness of seams, it is necessary to use rods made from glass-fibre reinforcement bars with diameters F4 and F6, instead of a metal mesh.

The thickness of the diameter of the reinforcement depends on the thickness of seams in the brickwork.

Replacing metal masonry mesh by the glass-fibre rods will reduce the cost of reinforcing material by more than 5 times.

Also, the using of glass-fibre rods in brickwork will significantly reduce heat loss, because the glass-fibre reinforcement bars does not conduct heat well, it conducts heat several times worse than metal.

7. binders for THE blockWORK, brickwork AND FOR MONOLYTHIC WALLS

For improving blockwork/brickwork strength and maintaining the same thickness of seams, it is necessary to use rods made from glass-fibre reinforcement bars with diameters F4, F6 and F8, instead of a metal mesh.

The thickness of the diameter of the reinforcement depends on the thickness of seams in the masonry.

Replacing metal masonry mesh by the glass-fibre rods will reduce the cost of reinforcing material by more than 5 times.

Also, the using of glass-fibre rods will significantly reduce heat loss, because the glass-fibre reinforcement bars do not conduct heat well, it conducts heat several times worse than metal.

8. COMBINATION WITH METAL IN THE SLAB PLATES

The slab plate is reinforced by two layers. The load on the slab plate goes from the top side to the bottom and is distributed relative to the entire coating area. So, the main working reinforcement bars are located in the lower layer and experiences high tensile loads. Top layer mainly receives compression loads.

In this case, the glass-fibre reinforcement is used in combination with metal. The top layer must be made from glass-fibre reinforcement bars, the bottom – from metal.

In the mesh, the glass-fibre composite reinforcement bars should have a solid appearance without gaps and cracks. If reinforcing of slab plate carryies out by using glass-fibre reinforcement bars F10, it will be necessary to perform a whip in size of of 400 mm. All joints of reinforcement bars should be placed in chess order.

9. FLEXIBLE BINDERS/JOINTS

Flexible binder/connection is used to connect the inner wall through the heat insulation (and air layer) with the facing wall as a whole in the system of three-layer walls.

Composite flexible connections are rods made of glass-fibre with lentgh from 200 to 600 mm with a periodic relief surface or rods with a circular cross section (depending on the design solution). Due to this, flexible connections have a high adhesion to concrete and additional protection against the aggressive effects of alkaline environment of concrete.

Flexible connections are applied:

• for brickwork (F 6 mm),

• for heat insulation of monolithic buildings (F 6 mm),

• for blocks (F 4 mm),

• for panel housing construction (F 6 mm).

Please visit our web-site for detailed information about composite flexible connections and to order them.

10. STRIP FOUNDATION UNDER FENCE

Strip foundations are provided for the following types of fencing: a fence with brick pillars, a metal forged fence and a fence made of timber or corrugated board with load-bearing metal racks.

Reinforcing of foundation for the fence using glass-fibre reinforcement bars is very beneficial. Due to the high strength characteristics of glass-fibre reinforcement bars and low loads, there are often used the composite reinforcement bars with diameters F4 and F6 for reinforcing of the foundation under fences.

Reinforcing technology is not difference from technology of using metal reinforcement bars, but much cheaper and faster by time.

The longitudinal rods of glass-fibre reinforcement are laid on the bottom of excavated trench on supports with a height of 4-7 cm. The end glass-fibre rods should be at the distance from the walls of the trench by 6-8 cm. Transverse reinforcement bars and vertical bars are usually connected with interval step of 400 mm.

The upper row of longitudinal reinforcement bars shall be mounted on racks so that they will be 5-7 cm lower than upper level of trench. Then the cross sectional glass-fibre reinforcement bars of the upper row shall be laid.

11. reinforcing of pool bowl (of bottom and walls of pool)

12. ROAD CONSTRUCTION

Glass-fibre reinforcement bars receives positive feedback from builders due to its versatility, since it can be used for improving of strength of roads, poles, bridges.

13. PEDESTRIAN PAVEMENTS AND PATHWAYS

For rigidity of concrete pathway, it is necessary to reinforce the base, although many builders neglect this measure.

At the time of reinforcing a pedestrian walkway with glass-fibre reinforcement, the thickness of the concrete base can be made smaller, which leads to significant savings in costs for concrete.

Also, using the glass-fibre reinforcement bars for the reinforcing of pedestrian walkways protects concrete from shutter into fragments.

14. CONCRETE GORUNDS FOR DRIVING AND PARKING CARS.

Before starting reinforcing of upper side for concrete ground, a layer of crushed stone of 5 cm shall be poured over the sand cushion and compacted.

Reinforcing of the glass-fibre reinforcement bars provides for strengthening of the concrete structure, so this reinforcing is mandatory to make parking lots for cars.

Concreting of the ground for driving and parking of cars is carried out using glass-fibre reinforcement bars, which shall be cut in from of rods in required length.

It is recommended to use glass-fibre reinforcement bars with a diameter of F6. The frame from rebars is made directly at the place of masonry and will not take much time. Glass-fibre rods shall be criss-crossed and bandaged at the coupling points with wires.