Rebar, also known as reinforcement bar, is a steel bar or mesh of steel wires to strengthen concrete. Concrete is strong in compression but weak in tension; adding rebar greatly increases its strength in tension. Rebar has a patterned surface so that it bonds better with the concrete.
The most common rebar material is carbon steel and stainless steel. Composite bars made of glass, carbon and basalt fiber are also used. Steel bars are often given a coating of epoxy resin to resist the effects of corrosion.
Trenchlesspedia Explains Rebar
Rebar is also used in concrete pipes to strengthen them and increase their effective life span. Since pipes are often buried under ground, they should be reguarly checked for damage and corrosion.
Pipes can be damaged during installation, exposing the rebar to the surrounding environment. Once the rebar is exposed, there is a tendency for a potential to be set up between the earth and the metal resulting in corrosion. Trenchless rehabilitation techniques such as mechanical spot repair, cured-in-place pipe (CIPP), sliplining and pipe bursting can be used to rehabilitate pipes that are damaged due to rebar corrosion.