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← HistoryWhich outcome results when freeze-thaw cycles act upon a sandstone structure incorporating pietra dura?
A)Increased compressive structural integrity
B)Accelerated degradation pietra detachment✓
C)Reduced expansion; material stiffening
D)Enhanced bond from thermal welding
💡 Explanation
Accelerated degradation and detachment occurs because freeze-thaw induces cyclical stress concentration arising from differential thermal expansion between the sandstone and pietra dura. This leads to weakened adhesive bonds, therefore the decorative inlays spall, rather than remaining intact due to altered expansion properties.
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