Which increased risk arises when a prestressed concrete beam experiences sustained elevated temperatures?

💡 Explanation

When a prestressed concrete beam is subjected to sustained high temperatures, bond failure occurs because differential thermal expansion weakens the adhesive forces, especially at the interface between the steel strands and the concrete. Therefore loss of prestress results, rather than increased concrete strength, or reduced steel yield strength or corrosion from chloride penetration which are separate degradation mechanisms.

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