@NickGri | The boxy cast stuff the dutch do for their swamp lands - see | Koen Olthuis | Bart Roeffen | Jelle Vedder | Chiel Bartels | and many many more - in our group we call them the “Delft Boys” for the university of Delft) | can definitly be vastly improved by using your basalt fiber components. The technology of standard concrete engineering floating boxes was already “off the shelf marine concrete technology” in the Mullberry Harbor. (around 1940) it has since widely been used in floating marina walkways and for the urbanisation of Dutch German and British swamp lands with boxy floating homes on concrete barges. The service life span depends mostly on the builder and his skills of “getting it right” and create a good embedd of the rebar.
Your basalt bar and rope components are certainly a great way to increase the lifespan and make something that will not fall apart due to spalling - even if the build is not perfect. Spalling as dominant failure mode can be completly EXCLUDED - certainly a leap forward.
The promise of a 200 year guaranteed service life and a expected service life of beyond 2000 years (similar to the Caesarea Harbor concrete and the Pantheon concrete ) is on the Table - that is certainly a promising floating city building material, a big step toward solving the engineering bottleneck, that held marine empires back to intent floating cities earlier, it is longer lasting then Venice´s swamp pile technology that lasted some 1500 years - no doubth. New Venice and New Atlantis could profit from the strenght and corrosion resistance of basalt.
In our group we have something in mind that goes along the lines of light advanced cement composite cluster shell floating islands a technology that stands somewhat apart and where unusual fiber components are part of the deal
(Modular Extension | Connectors | Cellular expansion | Building Technology | Advanced Cement Composites)
Means we do not exclude the standard concrete engineering we still use it where low tech and off the shelf tech is ok - but we believe that it is time to take things a bit further modern materials allow that - Matias Volco studied at Zaha Hadid´s class in London - and this is the general direction we see architecture on the ocean taking.