What is Rebar? Different types of Reinforcement Bars?
Reinforcement bars, sometimes known as “rebar,” are what give concrete structures their added strength. Plain concrete, as we all know, performs well in compression but falls short in tensile stresses, ultimately leading to brittle failure when the load is applied to the structure. When cast with concrete, these reinforcement bars give the concrete a good amount of tension. They might also be referred to as reinforcing bars.
For the objective of improving both quality and cost, the Steel Structure companies in Ghana have occasionally changed how these bars are used.
CARBON STEEL REBARS
Rebar made of carbon steel is the most popular kind and is sometimes referred to as a “black bar.” Although it is more quickly corroded than other varieties, its considerable versatility makes it unsuited for use in constructions that are constantly exposed to water or excessive humidity. However, many people believe that for all other kinds of buildings, carbon steel rebars are the finest choice.
STAINLESS STEEL REBARS
As an alternative to carbon steel reinforcement, stainless steel reinforcement can be employed. It is not possible to cause galvanic corrosion by using stainless steel reinforcing bars, and they can be a cost-effective option in places where corrosion is a concern or where restoration is challenging and expensive.
WELDED WIRE FABRIC REBARS
WWF is created by electrically joining together several steel wires that are all organised at right angles. In slab-on-ground slabs when the earth has been tightly compacted, it may be used. For walls and structural floor slabs, welded wire cloth with a heavier fabrication can be employed. This is frequently used in tiny concrete canals, drainage systems, box culverts, and road paving.
SHEET METAL REINFORCING BARS
When building stairs, roofs, and floor slabs, sheet-metal reinforcement is frequently employed. The components of sheet-metal reinforcement are pieces of annealed sheet steel twisted into corrugations that are about 1/16 of an inch deep and have holes punched at regular intervals.
EPOXY-COATED REBARS:
Instead of using ordinary rebar, corrosion-resistant rebar or epoxy-coated rebar is used to protect against exposure to attack from moisture, oxygen, and chloride.
There are many situations when rebar needs to be protected from corrosion. It is used extensively in structures, buildings, bridges, roads, etc. where there is a considerable risk of steel being exposed to moisture or water. When compared to conventional rebar, its odds of protecting rebar from corrosion are 70 to 1700 times better.
Rebar’s metallic surface is protected from corrosion caused by oxygen and chloride reduction.
The epoxy powder is applied via an electrostatic spray method on heated steel at a predetermined temperature.
TMT BARS:
Thermomechanically treated bars are produced using a sophisticated heat-treating procedure. In which the hot, red bars that come out of the final mill are immediately put through a process called “Rapid quenching” in which the hot bars are quickly cooled down by passing through a series of water jets. The most well-known rebar is noted for its superior weldability, super ductility, yield strength, ultimate tensile strength, improved elongation, and corrosion resistance bar. As a result of their high resistivity and ductility, TMT bars are even used in seismic loads. Steel structure companies in Ghana incorporate this method to produce top-quality rebars.
COLD TWISTED BARS (CTD)
These CTD bars are made using cold working techniques, then they are length-cut from hot bars that came out of the last mill while being cooled at room temperature. To boost the bar’s yield strength, it is then stretched and twisted.
Stretching and twisting the bar results in a 60% increase in physical strength, which indirectly demonstrates that a 60% increase in stress is acceptable when compared to mild steel. Utilizing CTD bars will reduce the 1000 tonnes of mild steel needed to reinforce concrete structures to just 400 tonnes. The main negative is that the bar’s elongation percentage decreases from 24% to 13% and its ductility decreases as a result of stretching.
GALVANIZED BAR
Another kind of rebar was utilised to prevent rusting. However, epoxy rebar is less effective than galvanised rebar. The procedure is applying a protective layer of zinc (Zn) metal on standard rebar.
Galvanized rebar is not externally coated on the bar, like other corrosion-resistant rebars, but rather is internally attached to the base of steel, creating a coating that is not firmly attached to steel but results in a coating that makes the rebar robust and tough and resistant to corrosion.
Prices and Cost of Rebar
Rebar’s price can be calculated either per foot or per tonne. When you locate a good steel price, be sure to lock it in as soon as possible because the price might change from month to month and even from day to day. For competent prices, Tema steel company limited would be the best choice.
