What is a common sign of failure in a bridge deck?

A common sign of failure in a bridge deck is cracking or spalling. This phenomenon often indicates underlying issues with the materials and structural integrity of the deck. Cracks can develop due to various factors, including excessive load, thermal expansion and contraction, freeze-thaw cycles, or poor construction practices. When these cracks are not addressed, they can lead to spalling, which is the chipping or flaking away of concrete, revealing the reinforcing steel beneath. This is a critical concern as exposed rebar can corrode, further compromising the deck's strength and safety.

While other signs, such as color fading of materials, increased traffic delays, and surface rusting, may suggest various conditions affecting a bridge, they do not specifically indicate imminent structural failure like cracking and spalling do. In contrast, the presence of cracks and spalling directly points to potential load-bearing issues that could endanger the bridge's overall stability and necessitate immediate inspection and repair.