rebar weights

No matter what type of construction project you are considering, the chances are that you will need rebar or reinforcement mesh products to provide tensile strength to any poured concrete or slab elements of your build. Whilst concrete itself has high compressive strength, it is relatively weak when it comes to tension, and that’s where rebar products come in - since steel and concrete have very similar thermal coefficients, they make the perfect partners in construction projects, to produce slabs and masonry components that are strong, sound and long-lasting.

It’s important to understand how different types and weights of rebar influence the tensile strength of the concrete elements that they are used in. Most rebar products are made from mild steel, and the quality of that steel is governed by British standards regulations. For loose rebar, the relevant standard is  and for steel mesh products, the standard is BS 4483: Steel fabric for the reinforcement of concrete.

The Composition of Rebar

Rebar steel is made of iron, with very small amounts of carbon, manganese, phosphorous and sulphur also included. The carbon element is what gives rebar its overall quality and tensile strength. Mild cold-pressed steel will typically have a carbon content of around 0.25%, whereas higher-grade hot-rolled steel will have a carbon content that is closer to 0.40%.

Rebar Surface Deformation

As well as the material composition of rebar, its overall weight per linear metre is also influenced by its diameter, and by the surface deformation, or patterning, on the particular type of rebar length or mesh sheet. By surface deformation, we mean that the outer surface of the rebar has been worked into a specific pattern, in order to provide better contact with the poured concrete, thereby increasing the overall structural strength of the slab or concrete form. The patterning on a particular type of rebar may not make a material difference to its overall tensile strength, when compared with other patterns, but it could make a difference to the weight of each length, so it is important to calculate weights accurately.

 

The table below gives an indication of the weights of the most common types and diameters of rebar, to highlight how much these vary for different projects.

Deformed Reinforcing Steel Rebar Weight

Rebar Diameter

Weight in Kg/m (theoretical)

6mm

0.222Kg/m

8mm

0.395Kg/m

10mm

0.62Kg/m

12mm

0.89Kg/m

14mm

1.21Kg/m

16mm

1.58Kg/m

18mm

2Kg/m

20mm

2.47Kg/m

22mm

2.98Kg/m

25mm

3.85Kg/m

28mm

4.83Kg/m

32mm

6.31Kg/m

40mm

9.87Kg/m

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