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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• Which mechanism causes the apparent retrograde motion of planets when observed using a medieval Islamic astrolabe?
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• Which outcome occurs when a trebuchet's counterweight is released from an elevated position?
• Which risk increased when 18th-century wooden warships remained at sea for extended deployments?
• Which mathematical challenge complicated 9th-century Islamic engineers' irrigation canal designs within complex curved terrains?