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f4eru:

--- Quote from: Marco on February 03, 2022, 08:20:53 pm --- Come to think of it though, how much maintenance does a concrete sphere even need?
--- End quote ---
A concrete structure needs regular maintenance, especially when subjected to salt water.
Under extreme pressure salt water, the salt and water will penetrate deeply and quickly.

voltsandjolts:
https://newscenter.lbl.gov/2013/06/04/roman-concrete/


--- Quote ---The chemical secrets of a concrete Roman breakwater that has spent the last 2,000 years submerged in the Mediterranean Sea have been uncovered by an international team of researchers led by Paulo Monteiro of the U.S. Department of Energy’s Lawrence Berkeley National Laboratory (Berkeley Lab), a professor of civil and environmental engineering at the University of California, Berkeley.

Analysis of samples provided by team member Marie Jackson pinpointed why the best Roman concrete was superior to most modern concrete in durability, why its manufacture was less environmentally damaging – and how these improvements could be adopted in the modern world.

“It’s not that modern concrete isn’t good – it’s so good we use 19 billion tons of it a year,” says Monteiro. “The problem is that manufacturing Portland cement accounts for seven percent of the carbon dioxide that industry puts into the air.”

--- End quote ---

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