While reading this article, I thought “I don’t think Romans used rebar, and yet this still stands 2000 years later?” Turns out, someone on Quora had the same q

While reading this article, I thought “I don’t think Romans used rebar, and yet this still stands 2000 years later?” Turns out, someone on Quora had the same question, and the answer lies in the fact that Romans did not use the same recipe we use for concrete. They included volcanic ash, which creates a stronger chemical bond, and obviates the need for rebar to some degree. A quick google search shows there’s a small movement to alter our current Portland Cement mixture to include volcanic ash. https://www.quora.com/How-come-buildings-from-the-Roman-Empire-needed-no-steel-reinforcement-when-modern-buildings-do https://www.quora.com/How-come-buildings-from-the-Roman-Empi...