Which consequence arises during frost heaves affecting Roman roads?

💡 Explanation

Frost heaves cause subgrade lifting and pavement cracking because repeated freezing/thawing expands subsurface water via ice lens formation; therefore, structural integrity decreases, rather than only affecting rolling resistance or drainage without pavement damage; the mechanism is volumetric expansion.

• Which outcome developed on ancient Roman roads when excessive seasonal temperature variations repeatedly stresses the concrete?
• Which maintenance risk increased during wet weather on Roman paved roads involving the 'agger' embankment?
• Which consequence increased during Byzantine silk production when Constantinople's water mills were over-taxed?
• Which consequence resulted from increased frictional losses during initial steamship voyages through narrow river channels?
• Which consequence would occur during the casting of Song Dynasty iron ploughshares when silica sand contaminates the mold?
• Which consequence results when Greenlandic longships encountered ice?