Bars are solid or hollow sections of steel that are used mainly to reinforce concrete and masonry structures. They come in a range of shapes, sizes and grades, each with its own properties and characteristics, making them invaluable building materials.
Bars are generally classified by their cross-sectional shape, size and grade, with a variety of different shapes available. The most common shapes are round, deformed and plain square bars. Round bars are normally straight and from 6 mm to 125 mm in diameter, with their most common applications in concrete reinforcement. Deformed bars are usually more rounded, with a pattern of raised surfaces that help to bond the bar to the concrete. These bars are commonly used for reinforcing foundation footing, walls and slabs and come in sizes from 8mm to more than 50mm in diameter. Plain square bars are mainly used in light structural applications such as scaffolding and formwork and range from 8mm to 125 mm in width.
Bars also come in a range of grades. Grade A and Grade B are the most common, with Grade A being the stronger, more popular choice. Grade A bars have a tensile strength of 450 megapascals, while Grade B bars have a strength of 390 megapascals. The grade of bar required depends on the size of the structure and the application.
It is also important to consider the shape and type of bar when selecting a grade, as Grade A and Grade B bars come in a variety of shapes, including straight, deformed and plain square bars. Each shape has its own specific properties and characteristics that make it more suited to certain applications and structures.
When specifying bars, it is important to consider not only the grade and shape, but also the size. Measurements must be taken carefully to ensure that the bars fit the required space and that they match the material strength and design requirements of the structure.
Bars also come in a variety of coatings, including galvanised, painted and stainless steel, each of which offers different levels of protection against corrosion. The right coating should be chosen based on the environmental conditions the bar will be exposed to.
Using the right bars in the right application can have a significant effect on the finished structure. As such, it is important that you select the correct bars, in the correct grade, shape and size, suitable for the application and the environment it is being used in.
