ICFs. Legos
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ICFs (insulated concrete forms) are hollow blocks, assembled like Legos, reinforced with rebar and filled with grout.
Here are a few commercial varieties:
https://theperfectblock.com/
http://e-zblock.com/
https://www.efbm.com/EF-Block-ICF-Blocks.htmlHere is something similar being poured:
Youtube VideoThese are code approved. I'm curious if a dome could be created using ICFs with the rebar and filled with Aircrete?