Which problem emerged along Hadrian's Wall sections using mortar-lined aqueducts during winter?

💡 Explanation

Mortar cracking arose due to repeated cycles of freezing and thawing. Water seeps into pores, then expands upon freezing causing fracture propagation – a process called cryofracture. Therefore cracking becomes likely, rather than increased leaching or reduced flow which need specific flow regime catalysts.

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