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← TechnologyWhich failure occurs when thermal expansion is unequally constrained within a concrete column?
A)Spalling and tensile cracking✓
B)Buckling and shear deformation
C)Creep and compressive yielding
D)Corrosion and delamination begin
💡 Explanation
Unequal constraint under heat induces tensile stress beyond the concrete section's limit because differential expansion leads to internal forces sufficient to overcome the tensile capacity. Therefore, surface spalling and cracking appear, rather than column-wide buckling, yielding, or widespread electrochemical corrosion.
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