Which risk increases when a post-tensioned concrete beam's tendon sheathing ruptures during grout injection?

💡 Explanation

Accelerated galvanic corrosion is a risk because the damaged sheathing allows grout and moisture to contact the dissimilar metals of the tendon and steel reinforcement, fostering an electrochemical reaction. Therefore, corrosion increases, rather than thermal expansion changes, shear capacity reduction or creep amplification.

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