To this day Roman concrete structures can be found in mundane ... exposed reinforcement bar (rebar) on Welland River bridge of the Queen Elizabeth Way in Niagara Falls, Ontario.

Roman concrete was crucial to the Colosseum ... live and work in concrete buildings, and travel across concrete bridges, we’re experiencing the legacy of millennia of human innovation.

The control concrete—without quicklime—remained cracked. This self-healing ability could explain how Roman harbors, bridges, ...