Catering To the Fatigue Life of Rebar
Rebar reinforcement is a vital part in concrete construction. Rebar steel rods are what improves and maintains a structure’s “tensile strength,” and assists in enduring stability stresses such as earthquakes, impact, and long-term corrosion. But the addition of rebar rods during the construction process is a tricky business when certain tools and equipment are used. Installation methods like bending and welding can greatly reduce the fatigue life of rebar, diminishing its function.
Fatigue Life Of Rebar
Machines such as cutters, benders, and straighteners manipulate the rebar for embedding. Degrees are determined and executed in order to produce a proper “skeleton” for the structure’s walls, ceiling, or floor. Sometimes welding must be administered to extend reaching capabilities. But the bending of the steel reduces its overall strength, as does welding two rods together. These details are avoided if possible, but when they must be implemented, tying machines will be used to apply wire to the ends or bend to add compensation stability.
Corrosion is an ongoing problem for steel and concrete, and when the ridged steel bars are visible under a concrete surface, it is a sure sign of corrosion, caused by chemical and elemental infiltration, called “spalling,” or “efflorescence,” the process of slow decay due to evaporated moisture crystallization. Rebar stress points such as bends and frayed cut ends are ideal candidates for rusting. Epoxy coating will maintain fresh life for rebar, but badly cut ends will produce quick corrosion spots which will travel beneath the coating, and also reduce the steel’s fatigue life.
While corrosion and some specific rebar installation methods are part of construction life, proper consideration for the overall fatigue life of rebar will improve long-term structural stability.