Maybe I'm in the wrong forum???
Things haven't only changed since 2017, they're changed since permalink #155.
Quote:
https://news.mit.edu › 2023 › roman-concrete-durability-lime-casts-0106
Riddle solved: Why was Roman concrete so durable? | MIT News ...
6 Jan 2023Under closer examination, these ancient samples also contain small, distinctive, millimeter-scale bright white mineral features, which have been long recognized as a ubiquitous component of Roman concretes. These white chunks, often referred to as "lime clasts," originate from lime, another key component of the ancient concrete mix.
https://www.archaeology.org › news › 11122-230111-roman-concrete-quicklime
New Thoughts on the Secrets of Roman Concrete
11 Jan 2023The high temperatures produced by the use of quicklime formed white chunks in the concrete known as lime clasts. Tests of the quicklime concrete recipe suggest that when later exposed to...
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When water reaches the lime clasts, it heals the cracks. I think someone with more energy than I can muster would cast compund-curved hexagonal panels that would interlock into a hemisphere that would las a thousand years.
The other thing to consider is Basalt instead of glass or Carbon fiber.
I'm surprised you didn't get a benefit from vibration.