> Why can’t we use carbon fiber or aluminum or anything that won’t rust? We can, we do, just steel is super duper cheap, and workable. Ironically, it's China

> Why can’t we use carbon fiber or aluminum or anything that won’t rust? We can, we do, just steel is super duper cheap, and workable. Ironically, it's China now who leads the world in GFRC (glass fibre reinforced concrete) construction to get those miniscule cost savings on steel (despite it being world's biggest steel producer.) There is also basalt fibre reinforced concrete that is supposed to be superior to glass fibre, and can come in workable varieties (heat it up with a torch, and bend.)