One material that is most commonly used in both residential and commercial infrastructures is the deformed reinforcing bar. It complied with all the local construction standards which is why it is always in-demand in every construction site.
Reinforcing steel and bar is also known as reo mesh, rebar, re-bar or reo bar. It is used to strengthen concrete because of its poor tensile strength. The presence of deformed bar is key to help concrete to adhere to a bar’s surface. In most cases around Perth and Western Australia, an engineer is commissioned early on to specify what mesh and bar are required for retaining walls, footings, slabs or suspended slabs. Read on…
Deformed bar is a class N (normal ductility) reinforcing bar used in a range of applications from reinforced concrete slabs to prefabricated beams, columns, cages and precast products. Also known as rebar, deformed bar complies with AS/NZS 4671 : 2001 steel reinforcing materials and is available in 500 MPa from 10 mm – 40 mm bar diameters. Always consult with an engineer before choosing the bar suited for your application.
The deformed reinforcing steel bar is supplied in length of 9m or 12 m as common sizes. The steel bar diameter applied is different and accordingly the weight varies.
Reinforced concrete is a material that is very strong in compression, but virtually without strength in tension. To compensate for this imbalance in a concrete slab’s behaviour, reinforcement bar (also known as rebar) is cast into it to carry the tensile loads. Deformed Bar was previously called Y-Bar eg: Y12, Y16 but through product improvements the tempcore strength was increased (now 500Mpa) and is now denoted as N-Bar. Refer here.
A general fact in any reinforced design is that the strain in the steel reinforcement is equal to the strain in the concrete surrounding it. However, in the parts subject to tension, the working stress in the steel is usually high enough for the strain to be stronger than the surrounding concrete is able to withstand without cracking. If cracks are formed in this way, the sizes would depend on the bond, the strain in the steel, the tensile strength of the concrete and its modulus of elasticity.
The design of reinforced concrete is taken from the principle that steel and concrete act together in resisting force. Concrete is a material that has strong compression but weak tension. Its tensile strength is just around one-tenth of its compression strength. Because of this, concrete works well for posts and columns that are compression members in a structure. However, when it is utilized for tension members, such as girders, foundation walls, beams, or floors, it should always be reinforced to attain the required tension strength.
The best material for reinforcing concrete is steel. Steel has properties of expansion for concrete. Such properties normally expand and contract at an equal rate for both steel and concrete.
Steel also creates a strong bond with concrete which is another reason why it is ideal for reinforcement. This bond strength is proportional to the contact surface of the steel to the concrete. This means that the greater the surface of steel exposed to the adherence of concrete, the stronger the bond. A deformed reinforcing bar adapts better than a round and plain one because of its great bearing surface. More than 40 percent more bars are needed if plain bars are used instead of deformed bars.
Rough surfaces of the steel are ideal in adhering steel to concrete. Steel with a light layer is better than clean steel. Nevertheless, steel with loose or scaly rust is inferior. The simplest way to remove loose or scaly rust from the steel is by rubbing it with burlap or similar materials.
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