Which risk increased during the construction of Roman aqueducts using opus caementicium in winter conditions?

💡 Explanation

When Roman aqueducts were built using opus caementicium during winter, the risk of freezing damage increased because water within the concrete matrix expands upon freezing, leading to cracking and weakening. Therefore freeze-thaw damage results, rather than pressure, sediment or instability increases which require different environmental triggers.

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