Which increased risk results from hydrogen-induced cracking during post-tensioning?

💡 Explanation

Untreated high-strength steel in tension allows hydrogen atoms ingress, leading to hydrogen embrittlement assisted by sustained loads acting through the material's grain boundaries, because delayed fracture through quasi-cleavage of material decreases tensile strength; therefore, strand rupture risk rises rather than any direct macroscopic effect on vibrational modes.

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