Egyptians stacked blocks of stone to build the pyramids.
Roman concrete was impressively strong.
Neither of them had steel-reinforced concrete.
Neither did Gothic cathedrals, which is why they needed flying buttresses.
Reinforced concrete as we know it today is a 19th century innovation, as I understand it.
https://en.wikipedia.org/wiki/Reinforced_concrete?wprov=sfla1
Maybe the commenter was thinking of adobe.
Egyptians stacked blocks of stone to build the pyramids.
Roman concrete was impressively strong.
Neither of them had steel-reinforced concrete.
Neither did Gothic cathedrals, which is why they needed flying buttresses.
Reinforced concrete as we know it today is a 19th century innovation, as I understand it.
https://en.wikipedia.org/wiki/Reinforced_concrete?wprov=sfla1
Maybe the commenter was thinking of adobe.