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Reinforcement ppt assignment

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  • 1. POLITEKNIK SULTAN SALAHUDDIN ABDUL AZIZ SHAH SHAH ALAM CC203 CONCRETE TECHNOLOGY ASSIGNMENT
  • 2. REINFORCEMENT Concrete 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
  • 3. 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.
  • 4. 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.
  • 5. • High strength. • High tensile strain. • Good bond to the concrete. • Thermal compatibility. • Durability in the concrete environment.
  • 6. 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.
  • 7. 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.
  • 8. 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.
  • 9. CONNECTION METHOD  Lap joint  Butt joint  Fillet joint
  • 10. 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.
  • 11. 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
  • 12. 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%
  • 13. •  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.