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← HistoryWhich outcome follows when Roman road aggregate undergoes repeated freeze-thaw cycles?
A)Lime pozzolan hardens excessively quickly
B)Flotation processing becomes more efficient
C)Cryogenic embrittlement causes asphalt cracking
D)Weakened subgrade invites structural rutting✓
💡 Explanation
Subgrade weakening promotes structural rutting because increasing moisture content weakens the granular matrix, diminishing soil bearing capacity under repeated loading. This induces plastic deformation, therefore roads exhibit rutting rather than maintain structural integrity at increasing saturation.
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