Importance of Rebar Chairs during Concrete Pouring
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During concrete works, one detail that often goes unnoticed by non-engineers is the rebar chair. These small supports hold reinforcement bars at the correct height before and during concrete pouring. To many workers, rebar chairs seem insignificant, but to engineers, they are essential for ensuring structural strength, durability, and accurate reinforcement. Without proper chairs, reinforcement shifts during concreting, altering the designed cover, and weakening the structural element. 1. Rebar Chairs Maintain Correct Concrete Cover Concrete cover is the protective layer of concrete over the reinforcement. It protects steel from corrosion, fire, and weathering. During pouring, reinforcement cages tend to sink or float if not supported. Chairs hold rebar at the exact height needed for: Bottom cover Top cover Side cover Without chairs, the cover becomes inconsistent. Even small reductions in cover expose reinforcement to moisture and air, eventually causing corrosion and spalling. 2. Cha...