The Roman Concrete Research Department had 200 years of trial-and-error to get the strongest concrete. I’m quite sure they poured hectares worth of varied conc

The Roman Concrete Research Department had 200 years of trial-and-error to get the strongest concrete. I’m quite sure they poured hectares worth of varied concrete mixture ratios and different material. Probably had a guy with a sledgehammer have had given it a daily whack on each of the thousand of test plots.