One of the main reason for basalt rebars is corrosion. Steel rebars corrode, basalt
rebars do not corrode. At least this is what I understand. I do not have any practical
experience with basalt rebars. With basalt rebar system it becomes possible to
make the concrete with seawater. No need freshwater to mixt the concrete.
The drawback I see, is the steel rebars can be used as electrodes for biorock
accretion late, the basalt rebars cannot be. I think. I do not think the basalt
rebars conduct electricity. The steel rebar do conduct electricity.
A basalt rebar concrete structure can be later wired on its concrete surface for
biorock accretion. So I do not see accretion as a lost possibility with basalt rebars.
I did pour concrete that I mixed with seawater. I did not use any rebar. The concrete holds.
I made about a 5'' × 5'' × 5" block. It behaves and look just like the fresh water mix.