How concrete becomes stronger with addition of rebar
Concrete has great strength to deal with stress in the form of compression. The tensile strength of concrete is 7–15% of its compressive strength. So, the concrete is comparatively weaker than its compressive properties. As a result, the concrete is not strong enough to withstand the forces that would endanger to pull it apart.
It is a specific problem in construction since the concrete in a building has to encounter both types of stresses. If any weight is provided on a concrete beam from above, its top will stand up defiantly against the compression. Its bottom, however, will encounter rigorous tensile stress since the beam deforms. It develops a situation that engineers often mention by the technical term "bad."
Rebar facilitates to improve this issue as, unlike concrete, rebar has good capacity to combat tensile stress. Consequently, rebar within concrete both reinforces the subsequent mixture by creating its strength more all-around as well as reduces the speed at which failure takes place. It allows the engineers to get sufficient time to identify a failure before it develops.
Go through the following video tutorial to get more information with handy visual examples.