Simple rebar 20 A1 Khorasan steel

Steel bars are generally used to strengthen concrete and rock structures to withstand tensile forces. Concrete is inherently strong enough to withstand compressive forces, but tensile forces can break it.

The rock structures and mortar walls are almost concrete-like and have relatively poor tensile strength. Some standard rock pieces, such as blocks and bricks, are designed to have special holes for reinforcing rebars. Although high strength tensile materials can be used as reinforcing agents to enhance the tensile strength of concrete, steel and concrete have a particular commonality, which makes them more used than steel for the construction of reinforcing rebars. This is a common aspect of the thermal expansion coefficient and its close proximity to steel and concrete causes the same lengths to change at different temperatures to prevent additional internal stresses in the concrete structure, thus preventing premature destruction of the concrete.