POLITEKNIK SULTAN SALAHUDDIN ABDUL AZIZ SHAH

SHAH ALAM

CC203 CONCRETE TECHNOLOGY

ASSIGNMENT

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REINFORCEMENTConcrete is about 90% weaker in tension than it is in compression

Steel has high tensile strength,has the same thermal expansion as concrete, and bonds well with concrete

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REINFORCED CONCRETE

• Reinforced concrete is a strong durable building material that can be formed into many varied shapes and sizes.• Its utility and versatility are

achieved by combining the best features of concrete and steel.

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PROPERTIES OF REINFORCED

CONCRETE• The tensile strength is only about 10 per cent of the

compressive strength.

• Reinforced concrete structures are designed on the assumption that the concrete does not resist any tensile forces.

• Reinforcement is designed to carry these tensile forces, which are transferred by bond between the interface of the two materials.

• If this bond is not adequate, the reinforcing bars will just slip within the concrete and there will not be a composite action.

• Concrete must be well compacted around the reinforcement during construction.

• In addition, some bars are ribbed or twisted so that there is an extra mechanical grip.

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•High strength.•High tensile strain.•Good bond to the concrete.• Thermal compatibility.•Durability in the concrete environment.

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THE POSITION OF REINFORCEMENT BAR

Bending of reinforcing bar process done after finish the cutting work.

Use bar bending table. Table must be enough length for place the reinforcing bar. If the bar is too length, hence two bar bending table must be

use. The bar must be bend slowly to avoid capillary crack For the bar with the large diameter can be heat The bar must be bend slowly to avoid capillary crack For the bar with the large diameter can be heat.

BENDING METHOD FOR REINFORCED BAR

The work of bending reinforcement bars is carried out after cutting jobs Its uses a hand bending tool which is placed on the table. Tables must be long enough to put a long bar reinforcement. If the bar is too long, then the two bending devices are used. Bar bending is done slowly to avoid capillary cracking. For large diameter bars, it should be heated first. For the high yield bar, it cannot be heated before bending.

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METHOD OF SORTING, TIE SPACING AND STEEL INSTALLATION

After the cutting bar, tie bar work fine with the wire.

It purposes for avoid movement, especially when the

concreting work in progress.

The wire bonding used a diameter of 0.8mm to 1.6mm.

CONNECTION METHOD

Lap joint Butt joint Fillet joint

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CONNECTION FOR POLE :THE BEST OF CONNECTION TO BE MADE IN 1/3 THE HEIGHT OF THE PILE.

CONNECTION OF BEAM :THE CONNECTION OF BEAM SHOULD BE FORMED ¼ DISTANCE BEAM FROM BOTH END.

MOORINGS :OCCURS WHEN CONNECTING BUILD TWO SECTIONS OF REINFORCED CONCRETE WHICH BAR IS SERVED IN THE OTHER.EXAMPLE ; BETWEEN THE PILLARS AND BEAM OR BETWEEN THE BASE OF THE COLUMN.

 

TYPE OF REINFORCEMENT

• Reinforcement bar

i. mild steel round bar

ii. High tensile deformed bar

iii. High yield deformed bar

• Reinforced steel mesh

i. Hexagonal wire mesh

ii. Welded wire mesh

iii. framework

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RELATE THE BINDING SPACING IN REINFORCEMENT

INSTALLATION• Reinforcement was installed according to engineering drawing that are

attached to a building

• It is important to ensure that the reinforcement has concrete cover

• Steel is bound with gauge iron faster 16 or 18

• This iron fasteners are used for stabilize and facilitate the placement of the reinforcement wire

• In the CP 110, we can know the requirement in the design of reinforcement structure

• All bending shall be made in accordance with engineering drawing tolerance is 25%

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• The sorting and spacing reinforcement :

• o Reinforcement shall be placed in the point where the maximum stress is located such as below the structure surface.

• o This is because the inclusion of reinforcement can be lead a bar to rust and this will weaken the bond with concrete.

• o The distance from the concrete surface to reinforcement (known as “concrete cover”) is between 15mm to 40mm.

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