OCFA Building Construction Practice Test

Spalling in concrete during a fire can expose rebar and weaken the structure, increasing the risk of what consequence?

Increased durability Structural weakening No effect Improved stability

Correct Answer:

Structural weakening

Explanation:

Spalling removes the concrete cover that normally shields the reinforcing bars from heat. With that protective layer gone, the rebar heats up quickly in a fire, losing strength and stiffness and the bond with surrounding concrete can deteriorate. This reduces the member’s load-carrying capacity and can lead to deformation or failure, so the main consequence is structural weakening. Increased durability or stability aren’t outcomes of spalling, and there is a real effect rather than none.

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