Why is it important to avoid "rebar congestion" during construction?

Avoiding "rebar congestion" is crucial primarily to maintain even concrete flow and proper placement around the reinforcing steel. When rebar is overcrowded in a certain area, it can hinder the flow of concrete, leading to potential weak spots in the finished structure. Proper placement of reinforcing steel is essential to ensure that the concrete adequately encases the rebar, providing necessary strength and stability to the structure. If the concrete cannot flow freely around the reinforcing bars, it can create voids or insufficient coverage, which undermines the structural integrity.

While visibility, inspection, and labor cost considerations are important, they are secondary to the fundamental requirement that concrete must envelop the rebar effectively for optimal performance. Ensuring that rebar is not congested allows for a proper bond between the concrete and reinforcing steel, which is vital for the overall strength and durability of the construction.