A ribbed reinforcement steel bar, also known as a deformed bar, is a type of steel bar that has ribs, lugs, or deformations on its surface that increase the bond with the concrete. Ribbed steel bars are usually used in reinforced concrete and masonry buildings, bridge decks and highways. Reinforcing bars are used to increase the strength of the concrete and other materials used in construction.
Ribbed reinforcement steel bars are manufactured according to the specific standards of each country. In Germany, ribbed reinforcement steel bars are produced in accordance with the European Reinforcing Bar Standard EN 10080 and are referred to as B’V-bars. This standard covers rolled and cold-drawn, hot finished, and hot-rolled steels for reinforcing concrete structures. The main types of bars available in Germany are Class A, Class B and Class C.
Class A reinforcing steel bars are hot-rolled bars which are supplied in the form of rods, coils or cages and comply with the applicable European standards. These bars have a nominal diameter which is determined by the size and shape of the bar. Class A bars are typically used in reinforced concrete foundations, slabs and walls. Class B reinforcing steel bars meet the European standard but the shape and size may vary. Class B bars are often used in horizontal structural members, bridges and pavements. Class C reinforcing steel bars are high tensile steel bars which include a mechanical and chemical treatment. Class C bars are used in high-stressed structures and bridge decks.
Reinforcing bars are also available in a variety of lengths and diameters. The lengths are generally in multiples of 1.1 meters, with some variations according to the type of bars required. The diameter of ribbed reinforcement steel bars range from 10 mm up to 50 mm. The size and shape of the bar is determined by the area it is to be used in, the strength requirements of the structure and the type of concrete used.
Reinforcing bars are available in grades ranging from 400 MPa up to 1,080 MPa, depending on their intended use. The higher the grade of the bar, the greater the tensile strength and the higher the ductility of the bar. High strength steel bars also have better corrosion resistance and are more durable than lower grade bars.
Reinforcing bars are available from a variety of suppliers in Germany. The majority of suppliers offer a wide range of bars which are manufactured to meet the standards of the European standard EN 10080. Additionally, some suppliers specialise in the production of certain types of bars, such as high tensile bars or galvanised reinforcing bars. Suppliers can often offer bars in a range of sizes and grades to meet the requirements of different applications.
