Rebar: Steel Reinforcement for Concrete Structures

Rebar is an abbreviation for the main ingredient in reinforced concrete: steel bars that are embedded in poured concrete footings, walls, slabs and other structures to make them stronger. Small ridges in each piece of rebar create a mechanical connection between concrete and steel after the concrete hardens. As a result, the finished footing, wall or slab gains considerable strength, especially in tension. A reinforced concrete slab or wall will be able to withstand force applied by expansive soil, by settling, and even (in some cases) by seismic activity.

Rebar comes in different thicknesses, and is sometimes coated with a finish to protect against corrosion. Building codes and engineering specifications determine rebar size, spacing and other steel reinforcement details for poured concrete structures. To keep the steel continuous, individual lengths of rebar are typically bent to extend around corners and overlapped so that they can be tied together with steel tie wire. On larger structures like concrete columns and grade beams, rebar "cages" are welded together and positioned inside forms. Concrete slabs often contain rebar as well as welded wire mesh.

Rebar problems are often a factor when concrete fails by cracking, shifting or settling. Contractors sometimes use little or no steel reinforcement in spite of what building plans call for, simply to save on construction expenses. Another problem can occur when rebar isn't positioned correctly, or if it shifts out of position during the pour. If the steel reinforcement is too close to the surface or edge of the concrete, its strengthening properties are compromised and it's more likely to rust, which will weaken the concrete further. There's a high price to pay if steel reinforcement details are poorly installed prior to pouring a concrete structure, and these poor construction practices keep foundation repair specialists busy. Fortunately, a skilled foundation repair specialist can rely on other types of steel reinforcement -like steel piers, brackets and tiebacks, for example-to correct foundation problems that result from inadequately reinforced concrete.

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Spokane Structures

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Basics of Rebar Detailing & Concrete Reinforcement For Structures

Rebar = Reinforcement Steel Bar

Detail:

to describe distinctly and minutely

to allocate a particular task

to provide detail drawings of each element of design

A rebar or reinforcing bar, is a common steel bar used generally in reinforced concrete (RCC) structures and masonry establishments. It is typically crafted from carbon steel and is given ridges for better mechanical fixing into the concrete. It can also be depicted as reinforcing steel or rebar reinforcement. In Australia it is conventionally called as "reo".

In general, any material with adequate tensile strength could feasibly be used to reinforce concrete. But since the thermal expansion coefficient of steel is almost same as that of concrete, a concrete member reinforced with steel will undergo minimal stress as a result of differential expansions of the two interconnected materials produced by temperature changes.

If steel has an expansion coefficient totally different to that of modern concrete, it would create problems through additional perpendicular and longitudinal stresses as a result of large temperature changes. Although rebar has ribs that fasten it mechanically to the concrete, under high stresses it may pull out of the concrete, an event that often leads to a large-scale collapse of structures. To avoid such a failure, rebar is either bent & hooked at the ends to fasten it around the concrete or deeply entrenched into adjacent structural members.

Cutting & bending of steel rebar sticks to fixing them into the concrete block or member is generally performed by expert reinforcement fabricators or rebar detailers. Rebar detailing is a crucial job and requires precision to deliver greater stability to the structure. The expert rebar detailers uses latest software technologies like Tekla, Revit and AutoCAD to provide exact rebar shop drawings as per the specifications and needs of structure or building. The accuracy of bending operations is crucial to ensure that they fit correctly at the construction site and at the same time keep necessary lap lengths & anchorage length.

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