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← TechnologyWhich risk increases when welding near pre-stressed concrete beams?
A)Hydrogen embrittlement weakening high-tensile steel✓
B)Alkali-silica reaction forming expansive gels
C)Creep rupture affecting bonded tendons
D)Chloride ingress causing rebar corrosion
💡 Explanation
Hydrogen embrittlement occurs because atomic hydrogen from welding diffuses into the high-strength pre-stressing steel, reducing its ductility and fracture resistance. Therefore, structural integrity is threatened, rather than causing concrete degradation or tendon issues.
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