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rebar Ralco


Steel strip rebar or steel wire mesh is used as a tension tool in reinforced concrete and reinforced masonry structures to strengthen and help concrete under tension.
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rebar Ralco

Rebar in English is a steel strip or mesh of steel wires that is used as a tension tool in reinforced concrete and reinforced masonry structures to strengthen and help concrete under tension. Concrete is strong under pressure, but has poor tensile strength. Rebar significantly increases the tensile strength of the structure. The surface of the rebar is often "deformed" with ribs, prongs, or indentations to create a better bond with the concrete and reduce the risk of slipping.

Engineers have always tried to add different materials and using different designs. To be able to increase the resistance of structures as much as possible and guarantee their strength against various risks. It is one of the materials that has long been known as one of the most basic components of concrete structures. It is rebar. Rebar has been used for a long time to strengthen the strength of concrete structures and the foundation of metal structures.

Mechanical properties of rebar in the structure

The rebar increases the strength of the structure and especially its tensile strength to a significant extent because concrete is inherently resistant enough to compressive forces, but it does not have much resistance to tensile forces and these forces can crack it or even crush As a result, the use of concrete without the presence of rebar is not useful and has little effect on the strength of the structure.

It was for the first time in 1800 AD that Joseph Lewis discovered that by adding steel rods to concrete, its tensile strength can be increased, and this eventually led to the construction of concrete structures that resist both tensile forces and have significant resistance and strength against compressive forces.

Then, in 1878, the first standards related to steel bars were established in the steel industry, and before that, rebars were produced without specific standards.

Changes in the use of rebar in the structure

They often make changes in the shape of the surface of the rods to have better bonding and adhesion with concrete. And this deformed pattern has a great effect on increasing the strength of the structure. They are ordinary steel strip reinforcements that are used as part of construction work and especially. They are used to support concrete and it can be said that using rebar is a useful choice. And it is cost-effective to strengthen building materials.

rebar standards

The American Society for Testing and Materials (ASTM) has established a standard identification rule that all rebars must follow:

  1. A number must specify the size of the rod.
  2. The grade ID of the rod should be mentioned: this grade indicates the performance resistance of the rod.
  3. A symbol must be inserted to identify the manufacturer who rolled the bar: this is usually a simple letter or symbol.

The Stahl table is one of the most widely used sources for checking rebars with different standards. This table contains information for the construction industry in which different rebar standards are mentioned, which are determined by the German Standard Institute.


Types of rebar

There are different types of rebars, each of which is selected according to the conditions of the structure. Rods are classified according to various factors, such as whether they are ribbed or not, or their strength.


They are the most common type of rebars and sometimes they are also referred to as "black bars". There are many types, but compared to other rods, they corrode easily, which ultimately makes them unsuitable for areas with high humidity or for structures that are often exposed to water. However, in many constructions, these types of rods are used.


They are made of a set of steel wires placed at right angles. They are usually used in drainage structures, small concrete channels, etc.

Sheet and metal reinforcing bars:

They are usually used in floors, stairs and roofing.

Epoxy coated rod:

These types of rebars are expensive and are actually carbon-steel rods that are coated with epoxy to increase their resistance to corrosion. Therefore, due to their resistance to corrosion, they are used in areas that are in contact with salt water or are at risk of corrosion. will lose

European rebars:

They are typically made of manganese so they tend to bend and deform more. These rebars are not suitable for use in areas that are prone to changing weather conditions such as storms and tornadoes or factors such as earthquakes. However, they can be affordable.

Stainless steel bars:

Stainless steel can be used as an alternative to carbon-steel rods, which do not have good moisture resistance. The use of stainless steel reinforcing bars does not cause galvanic corrosion, and they show good plasticity during work. These types of rods have a higher price than other types of rods, but due to the resistance they show, this resistance compensates for their high cost.

Galvanized rebars:

They are used for structures that are exposed to very humid environmental conditions. Although they are expensive.

Metal mesh bars:

They are usually used as reinforcement in structures that require a significant thickness of plaster or to strengthen light concrete structures.

Rebars reinforced with polymer or glass fibers (GFRP):

Similar to carbon fiber, GFRP rods do not crush under any circumstances, but on the other hand, they have a high price. These types of rods can work 20 times longer than epoxy rods.

There are also recycled rebars because rebars in concrete structures are among recyclable materials. The rods collected from these structures are re-smoothed as much as possible and sold or re-melted and used to make other metal tools.


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