Which mechanism limited the maximum length of single-span Roman aqueducts prior to the development of reinforced concrete?

💡 Explanation

When aqueducts spanned long distances, tensile stress on mortar increases due to the weight of the stone and water, leading to cracking at joints if the span becomes too long. Therefore, tensile failure of mortar joints limits the span, rather than seismic instability, lead erosion, or sediment buildup which require separate conditions.

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